WorldWideScience

Sample records for satellite-based mobile communications

  1. Trellis-coded CPM for satellite-based mobile communications

    Science.gov (United States)

    Abrishamkar, Farrokh; Biglieri, Ezio

    1988-01-01

    Digital transmission for satellite-based land mobile communications is discussed. To satisfy the power and bandwidth limitations imposed on such systems, a combination of trellis coding and continuous-phase modulated signals are considered. Some schemes based on this idea are presented, and their performance is analyzed by computer simulation. The results obtained show that a scheme based on directional detection and Viterbi decoding appears promising for practical applications.

  2. Potential markets for a satellite-based mobile communications system

    Science.gov (United States)

    Jamieson, W. M.; Peet, C. S.; Bengston, R. J.

    1976-01-01

    The objective of the study was to define the market needs for improved land mobile communications systems. Within the context of this objective, the following goals were set: (1) characterize the present mobile communications industry; (2) determine the market for an improved system for mobile communications; and (3) define the system requirements as seen from the potential customer's viewpoint. The scope of the study was defined by the following parameters: (1) markets were confined to U.S. and Canada; (2) range of operation generally exceeded 20 miles, but this was not restrictive; (3) the classes of potential users considered included all private sector users, and non-military public sector users; (4) the time span examined was 1975 to 1985; and (5) highly localized users were generally excluded - e.g., taxicabs, and local paging.

  3. Trellis coding with Continuous Phase Modulation (CPM) for satellite-based land-mobile communications

    Science.gov (United States)

    1989-01-01

    This volume of the final report summarizes the results of our studies on the satellite-based mobile communications project. It includes: a detailed analysis, design, and simulations of trellis coded, full/partial response CPM signals with/without interleaving over various Rician fading channels; analysis and simulation of computational cutoff rates for coherent, noncoherent, and differential detection of CPM signals; optimization of the complete transmission system; analysis and simulation of power spectrum of the CPM signals; design and development of a class of Doppler frequency shift estimators; design and development of a symbol timing recovery circuit; and breadboard implementation of the transmission system. Studies prove the suitability of the CPM system for mobile communications.

  4. Integration between terrestrial-based and satellite-based land mobile communications systems

    Science.gov (United States)

    Arcidiancono, Antonio

    A survey is given of several approaches to improving the performance and marketability of mobile satellite systems (MSS). The provision of voice/data services in the future regional European Land Mobile Satellite System (LMSS), network integration between the Digital Cellular Mobile System (GSM) and LMSS, the identification of critical areas for the implementation of integrated GSM/LMSS areas, space segment scenarios, LMSS for digital trunked private mobile radio (PMR) services, and code division multiple access (CDMA) techniques for a terrestrial/satellite system are covered.

  5. Integration between terrestrial-based and satellite-based land mobile communications systems

    Science.gov (United States)

    Arcidiancono, Antonio

    1990-01-01

    A survey is given of several approaches to improving the performance and marketability of mobile satellite systems (MSS). The provision of voice/data services in the future regional European Land Mobile Satellite System (LMSS), network integration between the Digital Cellular Mobile System (GSM) and LMSS, the identification of critical areas for the implementation of integrated GSM/LMSS areas, space segment scenarios, LMSS for digital trunked private mobile radio (PMR) services, and code division multiple access (CDMA) techniques for a terrestrial/satellite system are covered.

  6. Satellite-Based Quantum Communications

    Energy Technology Data Exchange (ETDEWEB)

    Hughes, Richard J [Los Alamos National Laboratory; Nordholt, Jane E [Los Alamos National Laboratory; McCabe, Kevin P [Los Alamos National Laboratory; Newell, Raymond T [Los Alamos National Laboratory; Peterson, Charles G [Los Alamos National Laboratory

    2010-09-20

    Single-photon quantum communications (QC) offers the attractive feature of 'future proof', forward security rooted in the laws of quantum physics. Ground based quantum key distribution (QKD) experiments in optical fiber have attained transmission ranges in excess of 200km, but for larger distances we proposed a methodology for satellite-based QC. Over the past decade we have devised solutions to the technical challenges to satellite-to-ground QC, and we now have a clear concept for how space-based QC could be performed and potentially utilized within a trusted QKD network architecture. Functioning as a trusted QKD node, a QC satellite ('QC-sat') could deliver secret keys to the key stores of ground-based trusted QKD network nodes, to each of which multiple users are connected by optical fiber or free-space QC. A QC-sat could thereby extend quantum-secured connectivity to geographically disjoint domains, separated by continental or inter-continental distances. In this paper we describe our system concept that makes QC feasible with low-earth orbit (LEO) QC-sats (200-km-2,000-km altitude orbits), and the results of link modeling of expected performance. Using the architecture that we have developed, LEO satellite-to-ground QKD will be feasible with secret bit yields of several hundred 256-bit AES keys per contact. With multiple ground sites separated by {approx} 100km, mitigation of cloudiness over any single ground site would be possible, potentially allowing multiple contact opportunities each day. The essential next step is an experimental QC-sat. A number of LEO-platforms would be suitable, ranging from a dedicated, three-axis stabilized small satellite, to a secondary experiment on an imaging satellite. to the ISS. With one or more QC-sats, low-latency quantum-secured communications could then be provided to ground-based users on a global scale. Air-to-ground QC would also be possible.

  7. Digital, Satellite-Based Aeronautical Communication

    Science.gov (United States)

    Davarian, F.

    1989-01-01

    Satellite system relays communication between aircraft and stations on ground. System offers better coverage with direct communication between air and ground, costs less and makes possible new communication services. Carries both voice and data. Because many data exchanged between aircraft and ground contain safety-related information, probability of bit errors essential.

  8. Spacetime effects on satellite-based quantum communications

    Science.gov (United States)

    Bruschi, David Edward; Ralph, Timothy C.; Fuentes, Ivette; Jennewein, Thomas; Razavi, Mohsen

    2014-08-01

    We investigate the consequences of space-time being curved on space-based quantum communication protocols. We analyze tasks that require either the exchange of single photons in a certain entanglement distribution protocol or beams of light in a continuous-variable quantum key distribution scheme. We find that gravity affects the propagation of photons, therefore adding additional noise to the channel for the transmission of information. The effects could be measured with current technology.

  9. Spacetime effects on satellite-based quantum communications

    CERN Document Server

    Bruschi, David Edward; Fuentes, Ivette; Jennewein, Thomas; Razavi, Mohsen

    2013-01-01

    We investigate the effects of space-time curvature on space-based quantum communication protocols. We analyze tasks that require either the exchange of single photons in a certain entanglement distribution protocol or beams of light in a continuous-variable quantum key distribution scheme. We find that gravity affects the propagation of photons, therefore acting as a noisy channel for the transmission of information. The effects can be measured with current technology.

  10. Mobile communication and intermediality

    DEFF Research Database (Denmark)

    Helles, Rasmus

    2013-01-01

    The article argues the importance of intermediality as a concept for research in mobile communication and media. The constant availability of several, partially overlapping channels for communication (texting, calls, email, Facebook, etc.) requires that we adopt an integrated view of the various...... communicative affordances of mobile devices in order to understand how people choose between them for different purposes. It is argued that mobile communication makes intermediality especially central, as the choice of medium is detached from the location of stationary media and begins to follow the user across...

  11. Performance tests of a satellite-based asymmetric communication network for the 'hyper hospital'.

    Science.gov (United States)

    Yamaguchi, T

    1997-01-01

    The Hyper Hospital is a prototype networked telemedicine system which uses virtual reality. We measured the performance of a novel multimedia network based on satellite communications. The network was a hybrid system consisting of a satellite channel in one direction and a terrestrial channel in the other. Each user was equipped with a standard satellite communication receiver and a telephone connection. Requests from the users were sent by modern and telephone line and responses were received by satellite. The user requests were initiated by clicking buttons on a World Wide Web browser screen. The transmission rates of satellite and normal telephone-line communications were compared for standardized text data. Satellite communication was three to five times faster. The transmission rate was also measured for standardized graphical data (GIF format). With a file size of about 400 kByte, satellite-mediated communication was 10 times faster than telephone lines. The effect of simultaneous access on performance was also explored. For simultaneous access of nine users to a single graphics file, 78% of the transmission speed was obtained in comparison with that of a single user. The satellite-based system showed excellent high-speed communication performance, particularly for multimedia data.

  12. Technical comparison of several global mobile satellite communications systems

    Science.gov (United States)

    Comparetto, Gary M.

    The era of satellite-based mobile satellite communications (MSC) systems started with the first MARISAT satellite which was launched into a geostationary orbit over the Pacific Ocean in 1976 to provide communications between ships and shore stations. The combination of high cost and unacceptably large equipment has kept the space-based MSC systems from appealing to the wider market of personal mobile communications. The progress made over the last ten years, however, in digital voice processing, satellite technology, and component miniaturization has resulted in the viability of satellite-based mobile satellite communications systems to meet the growing market in personal mobile communications using handsets similar to those currently in use with land-based cellular systems. Three of the more mature LEO/MEO satellite systems are addressed in this paper including GLOBALSTAR, Iridium, and Odyssey. The system architectures of each system are presented along with a description of the satellite and user handset designs and the multiaccess techniques employed. It will be shown that, although a number of similarities exist among the system addressed, each system is unique in a variety of significant design areas. It is concluded that the technical feasibility of satellite-based mobile satellite communications systems seems to be secure. It will be challenging, however, for the vendors to actually develop and deploy these systems in a cost effective, timely, and reliable way that meets a continually evolving set of requirements based upon a rapidly changing technology base.

  13. Fade-Free Mobile Communication

    Science.gov (United States)

    Stevenson, C. R.

    1986-01-01

    Scheme for mobile communication reduces multipath fading and interference between adjacent channels. Proposed communication system lends itself to almost completely digital implementation, eliminating costly and bulky crystal filters. Scheme suitable for satellite-aided or terrestrial mobile communication, including cellular mobile telephony, at frequencies in 150-to-900-MHz range.

  14. Mobile satellite communications handbook

    CERN Document Server

    Cochetti, Roger

    2014-01-01

    With a Preface by noted satellite scientist Dr. Ahmad Ghais, the Second Edition reflects the expanded user base for this technology by updating information on historic, current, and planned commercial and military satellite systems and by expanding sections that explain the technology for non-technical professionals.   The book begins with an introduction to satellite communications and goes on to provide an overview of the technologies involved in mobile satellite communications, providing basic introductions to RF Issues, power Issues, link issues and system issues. It describes

  15. Mobile phones and mobile communication

    DEFF Research Database (Denmark)

    Ling, Richard; Donner, Jonathan

    With staggering swiftness, the mobile phone has become a fixture of daily life in almost every society on earth. In 2007, the world had over 3 billion mobile subscriptions. Prosperous nations boast of having more subscriptions than people. In the developing world, hundreds of millions of people who...... could never afford a landline telephone now have a mobile number of their own. With a mobile in our hand many of us feel safer, more productive, and more connected to loved ones, but perhaps also more distracted and less involved with things happening immediately around us. Written by two leading...... researchers in the field, this volume presents an overview of the mobile telephone as a social and cultural phenomenon. Research is summarized and made accessible though detailed descriptions of ten mobile users from around the world. These illustrate popular debates, as well as deeper social forces at work...

  16. Advances in Mobile Data Communications

    Institute of Scientific and Technical Information of China (English)

    Sean Cai; Li Mo

    2011-01-01

    This special issue of ZTE Communications focuses on recent advances in mobile data communications for the ICT and telecommunications industries. The ever-increasing amount of mobile data traffic has beenthe subject of many studies. This research area is widely applicable to contemporary technology and network optimization techniques.

  17. Electronic Payments using Mobile Communication Devices

    OpenAIRE

    Waaij, B.D. van der; Siljee, B.I.J.; Broekhuijsen, B.J.; Ponsioen, C.; Maas, A; Aten, R.M.; Hoepman, J.H.; Loon, J.H. van; Smit, M.

    2009-01-01

    A method of making a payment uses a first mobile communication device (1) and a second mobile communication device (2), each mobile communication device being provided with a respective near field communication unit (11, 21) and at least one of the mobile communication devices being provided with an input unit (12) for inputting data. The method comprises the steps of:• the first mobile communication device (1) receiving, through its near field communication unit (11), account data (ACD) from...

  18. Mobile Communication Systems and Security

    CERN Document Server

    Rhee, Man Young

    2009-01-01

    Mobile Communication Systems and Security arms readers with a thorough understanding of all major cellular air-interface technologies and their security layer techniques. Rhee covers the technological development of wireless mobile communications in compliance with each iterative generation up to 3G systems and beyond, with an emphasis on wireless security aspects. By progressing in a systematic manner, presenting the theory and practice of wireless mobile technologies along with various security problems, readers will gain an intimate sense of how mobile systems operate and how to address com

  19. Electronic Payments using Mobile Communication Devices

    NARCIS (Netherlands)

    Waaij, B.D. van der; Siljee, B.I.J.; Broekhuijsen, B.J.; Ponsioen, C.; Maas, A.; Aten, R.M.; Hoepman, J.H.; Loon, J.H. van; Smit, M.

    2009-01-01

    A method of making a payment uses a first mobile communication device (1) and a second mobile communication device (2), each mobile communication device being provided with a respective near field communication unit (11, 21) and at least one of the mobile communication devices being provided with an

  20. Electronic Payments using Mobile Communication Devices

    NARCIS (Netherlands)

    Waaij, B.D. van der; Siljee, B.I.J.; Broekhuijsen, B.J.; Ponsioen, C.; Maas, A.; Aten, R.M.; Hoepman, J.H.; Loon, J.H. van; Smit, M.

    2009-01-01

    A method of making a payment uses a first mobile communication device (1) and a second mobile communication device (2), each mobile communication device being provided with a respective near field communication unit (11, 21) and at least one of the mobile communication devices being provided with an

  1. Introduction to digital mobile communication

    CERN Document Server

    Akaiwa, Yoshihiko

    2015-01-01

    Introduces digital mobile communications with an emphasis on digital transmission methods This book presents mathematical analyses of signals, mobile radio channels, and digital modulation methods. The new edition covers the evolution of wireless communications technologies and systems. The major new topics are OFDM (orthogonal frequency domain multiplexing), MIMO (multi-input multi-output) systems, frequency-domain equalization, the turbo codes, LDPC (low density parity check code), ACELP (algebraic code excited linear predictive) voice coding, dynamic scheduling for wireless packet data t

  2. Mobile communication security

    NARCIS (Netherlands)

    Broek, F.M.J. van den

    2016-01-01

    Security of the mobile network Fabian van den Broek We looked at the security of the wireless connection between mobile phone and cell towers and suggested possible improvements. The security was analysed on a design level, by looking at the protocols and encryption techniques, but also on an impl

  3. Mobile communication security

    NARCIS (Netherlands)

    Broek, F.M.J. van den

    2016-01-01

    Security of the mobile network Fabian van den Broek We looked at the security of the wireless connection between mobile phone and cell towers and suggested possible improvements. The security was analysed on a design level, by looking at the protocols and encryption techniques, but also on an impl

  4. Experimental free-space distribution of entangled photon pairs over 13 km: towards satellite-based global quantum communication.

    Science.gov (United States)

    Peng, Cheng-Zhi; Yang, Tao; Bao, Xiao-Hui; Zhang, Jun; Jin, Xian-Min; Feng, Fa-Yong; Yang, Bin; Yang, Jian; Yin, Juan; Zhang, Qiang; Li, Nan; Tian, Bao-Li; Pan, Jian-Wei

    2005-04-22

    We report free-space distribution of entangled photon pairs over a noisy ground atmosphere of 13 km. It is shown that the desired entanglement can still survive after both entangled photons have passed through the noisy ground atmosphere with a distance beyond the effective thickness of the aerosphere. This is confirmed by observing a spacelike separated violation of Bell inequality of 2.45+/-0.09. On this basis, we exploit the distributed entangled photon source to demonstrate the Bennett-Brassard 1984 quantum cryptography scheme. The distribution distance of entangled photon pairs achieved in the experiment is for the first time well beyond the effective thickness of the aerosphere, hence presenting a significant step towards satellite-based global quantum communication.

  5. Validation and in vivo assessment of an innovative satellite-based solar UV dosimeter for a mobile app dedicated to skin health.

    Science.gov (United States)

    Morelli, M; Masini, A; Simeone, E; Khazova, M

    2016-09-31

    We present an innovative satellite-based solar UV (ultraviolet) radiation dosimeter with a mobile app interface that has been validated by exploiting both ground-based measurements and an in vivo assessment of the erythemal effects on some volunteers having controlled exposure to solar radiation. The app with this satellite-based UV dosimeter also includes other related functionalities such as the provision of safe sun exposure time updated in real-time and end exposure visual/sound alert. Both validations showed that the system has a good accuracy and reliability needed for health-related applications. This app will be launched on the market by siHealth Ltd in May 2016 under the name of "HappySun" and is available for both Android and iOS devices (more info on ). Extensive R&D activities are on-going for the further improvement of the satellite-based UV dosimeter's accuracy.

  6. Principles of Mobile Communication

    CERN Document Server

    Stüber, Gordon L

    2012-01-01

    This mathematically rigorous overview of physical layer wireless communications is now in a third, fully revised and updated edition. Along with coverage of basic principles sufficient for novice students, the volume includes plenty of finer details that will satisfy the requirements of graduate students aiming to research the topic in depth. It also has a role as a handy reference for wireless engineers. The content stresses core principles that are applicable to a broad range of wireless standards. Beginning with a survey of the field that introduces an array of issues relevant to wireless communications and which traces the historical development of today’s accepted wireless standards, the book moves on to cover all the relevant discrete subjects, from radio propagation to error probability performance and cellular radio resource management. A valuable appendix provides a succinct and focused tutorial on probability and random processes, concepts widely used throughout the book. This new edition, revised...

  7. Principles of mobile communication

    CERN Document Server

    Stüber, Gordon L

    2017-01-01

    This mathematically rigorous overview of physical layer wireless communications is now in a 4th, fully revised and updated edition. The new edition features new content on 4G cellular systems, 5G cellular outlook, bandpass signals and systems, and polarization, among many other topics, in addition to a new chapters on channel assignment techniques. Along with coverage of fundamentals and basic principles sufficient for novice students, the volume includes finer details that satisfy the requirements of graduate students aiming to conduct in-depth research. The book begins with a survey of the field, introducing issues relevant to wireless communications. The book moves on to cover relevant discrete subjects, from radio propagation, to error probability performance, and cellular radio resource management. An appendix provides a tutorial on probability and random processes. The content stresses core principles that are applicable to a broad range of wireless standards. New examples are provided throughout the bo...

  8. Analysis and Optimization for Mobile Agent Communication

    Institute of Scientific and Technical Information of China (English)

    YANGBo; LIUDayou

    2005-01-01

    Communication performance is one of the most important factors affecting the efficiency of mobile agent system. Only traditional optimization techniques for communication performance are not enough, especially in large-scale intelligent mobile agent system, so more intelligent optimization techniques are needed. In the background, the paper studies communication of mobile agent system from the viewpoint of performance. The paper makes qualitative and quantitative analysis of four important factors that will affect the communication performance of mobile agent system and presents the communication performance optimization model. The model hasthree primary functions. First, the model provides a formalism method to describe the communication task and process of mobile agent. Second, the model provides a means to make quantitative analysis of the performance of mobile agent system. Third, the model can plan out an optimal communication scheme for mobile agent to minimize the cost of whole communication. The model could thus be a building block for the optimization of the communication behavior of mobile agent.

  9. Trends in mobile satellite communication

    Science.gov (United States)

    Johannsen, Klaus G.; Bowles, Mike W.; Milliken, Samuel; Cherrette, Alan R.; Busche, Gregory C.

    1993-01-01

    Ever since the U.S. Federal Communication Commission opened the discussion on spectrum usage for personal handheld communication, the community of satellite manufacturers has been searching for an economically viable and technically feasible satellite mobile communication system. Hughes Aircraft Company and others have joined in providing proposals for such systems, ranging from low to medium to geosynchronous orbits. These proposals make it clear that the trend in mobile satellite communication is toward more sophisticated satellites with a large number of spot beams and onboard processing, providing worldwide interconnectivity. Recent Hughes studies indicate that from a cost standpoint the geosynchronous satellite (GEOS) is most economical, followed by the medium earth orbit satellite (MEOS) and then by the low earth orbit satellite (LEOS). From a system performance standpoint, this evaluation may be in reverse order, depending on how the public will react to speech delay and collision. This paper discusses the trends and various mobile satellite constellations in satellite communication under investigation. It considers the effect of orbital altitude and modulation/multiple access on the link and spacecraft design.

  10. Vocoders in mobile satellite communications

    Science.gov (United States)

    Kriedte, W.; Canavesio, F.; dal Degan, N.; Pirani, G.; Rusina, F.; Usai, P.

    Owing to the power constraints that characterize onboard transmission sections, low-bit-rate coders seem suitable for speech communications inside mobile satellite systems. Vocoders that operate at rates below 4.8 kbit/s could therefore be a desirable solution for this application, providing also the redundancy that must be added to cope with the channel error rate. After reviewing the mobile-satellite-systems aspects, the paper outlines the features of two different types of vocoders that are likely to be employed, and the relevant methods of assessing their performances. Finally, some results from computer simulations of the speech transmission systems are reported.

  11. Communications Systems for Mobile Robotics

    Energy Technology Data Exchange (ETDEWEB)

    Futterman, J A; Pao, H

    2003-12-08

    Performance Confirmation is the activity by which the Yucca Mountain Project confirms that the engineered and natural containment barriers of this national nuclear waste repository are performing as predicted, so that an eventual decision to close the repository can be made. This activity involves systems that must be inspected and, in some cases, serviced by mobile robots. This paper discusses systems for underground mobile robot communications, including requirements, environments, options, issues, and down-select criteria. We reviewed a variety of systems, including Slotted Waveguide, Powerline Carrier, Leaky Feeder, Photonic Bandgap Fiber, Free-Space Optics, Millimeter Waves, Terahertz Systems, and RF Systems (including IEEE 802.11 a,b, and g, and Ultra-Wideband radio).

  12. Signal processing for mobile communications handbook

    CERN Document Server

    Ibnkahla, Mohamed

    2004-01-01

    INTRODUCTIONSignal Processing for Future Mobile Communications Systems: Challenges and Perspectives; Quazi Mehbubar Rahman and Mohamed IbnkahlaCHANNEL MODELING AND ESTIMATIONMultipath Propagation Models for Broadband Wireless Systems; Andreas F. Molisch and Fredrik TufvessonModeling and Estimation of Mobile Channels; Jitendra K. TugnaitMobile Satellite Channels: Statistical Models and Performance Analysis; Giovanni E. Corazza, Alessandro Vanelli-Coralli, Raffaella Pedone, and Massimo NeriMobile Velocity Estimation for Wireless Communications; Bouchra Senadji, Ghazem Azemi, and Boualem Boashash

  13. Mobile communication and the protection of children

    NARCIS (Netherlands)

    Ong, Rebecca

    2010-01-01

    Mobile phones and other smart connected devices have fundamentally changed contemporary life. Globally, we see unprecedented explosion of new generation mobile phones. More precisely, mobile communication is nowadays really pervasive in social life. For instance, children and young persons are emerg

  14. Effective Protocols for Mobile Communications and Networking

    Energy Technology Data Exchange (ETDEWEB)

    Espinoza, J.; Sholander, P.; Van Leeuwen, B,

    1998-12-01

    This report examines methods of mobile communications with an emphasis on mobile computing and wireless communications. Many of the advances in communications involve the use of Internet Protocol (IP), Asynchronous Transfer Mode (ATM), and ad hoc network protocols. However, many of the advances in these protocols have been focused on wired communications. Recently much focus has been directed at advancing communication technology in the area of mobile wireless networks. This report discusses various protocols used in mobile communications and proposes a number of extensions to existing protocols. A detailed discussion is also included on desirable protocol characteristics and evaluation criteria. In addition, the report includes a discussion on several network simulation tools that maybe used to evaluate network protocols.

  15. Mobile Perspectives: On Websites. Mobile Matters--Communication Trumps Technology

    Science.gov (United States)

    Evans, Susan T.

    2011-01-01

    Mobile technology is a favorite discussion topic among senior IT leaders and higher education administrators. Mobile is the future for content delivery. Colleges and universities need to establish a strategy now and make the decisions necessary to take advantage of this communication opportunity. In this article, the author recommends making…

  16. Mobile communication in the global south

    DEFF Research Database (Denmark)

    Ling, Richard; Horst, Heather

    2011-01-01

    and how it is challenging, and in many cases changing, notions of gender. While the mobile phone reshapes development and micro dynamics of gendered interactions, it is not necessarily a revolutionary tool. Existing power structures may be rearranged, but they are nonetheless quite stable. The analysis...... of mobile communication in the global south helps us to understand the rise of innovative practices around information and communication technologies and, in turn, enables us to develop theory to understand these emergent empirical realities....

  17. System Architecture and Mobility Management for Mobile Immersive Communications

    Directory of Open Access Journals (Sweden)

    Mehran Dowlatshahi

    2007-01-01

    Full Text Available We propose a system design for delivery of immersive communications to mobile wireless devices based on a distributed proxy model. It is demonstrated that this architecture addresses key technical challenges for the delivery of these services, that is, constraints on link capacity and power consumption in mobile devices. However, additional complexity is introduced with respect to application layer mobility management. The paper proposes three possible methods for updating proxy assignments in response to mobility management and compares the performance of these methods.

  18. The Evolution of Personal Mobile Communications

    Institute of Scientific and Technical Information of China (English)

    I.S.Groves

    1995-01-01

    Within Europe the recently published Mobile Green Paper predicts a market for person-al communication services(PCS)of,perhaps,80% of the population-one connection to every adult.In the light of such a demand this paper reviews the emergence of present generation sys-tems and looks forward at vision for third generation mobile systems.

  19. MIS-Grid for Future Mobile Communications

    Institute of Scientific and Technical Information of China (English)

    MA Jian-guo; XING Ling; LI Zai-ming

    2004-01-01

    The dilemma of modern mobile communications technology is analyzed. Aiming at some problems in the 3G systems, a new network architecture is proposed on the principle of mobile information sharing grid (MIS-Grid). The essence of MIS-Grid is to transfer the hot wide band information with cheap unidirectional broadcasting channels and the personalized services with relatively expensive interactive networks.

  20. Mobile Communication and Work Practices in Knowledge-based Organizations

    OpenAIRE

    Pertti Hurme

    2005-01-01

    This paper examines the role of mobile communication, mobile tools and work practices in the context of organizations, especially knowledge-based organizations. Today, organizations are highly complex and diverse. Not surprisingly, various solutions to incorporating mobile tools and mobile communication in organizations have been devised. Challenges to technological development and research on mobile communication are presented.

  1. Mobile Communication and Work Practices in Knowledge-based Organizations

    Directory of Open Access Journals (Sweden)

    Pertti Hurme

    2005-01-01

    Full Text Available This paper examines the role of mobile communication, mobile tools and work practices in the context of organizations, especially knowledge-based organizations. Today, organizations are highly complex and diverse. Not surprisingly, various solutions to incorporating mobile tools and mobile communication in organizations have been devised. Challenges to technological development and research on mobile communication are presented.

  2. Mobile Communication in the Age of Smartphones

    DEFF Research Database (Denmark)

    Bertel, Troels Fibæk

    2013-01-01

    Recent years have seen great changes to the landscape of mobile communication in Denmark where smartphones have become widespread and the mediascape in general has become increasingly complex as the lines of demarcation among different media have blurred. This dissertation studies the processes...... of domestication and re-domestication of mobile communication among youth in Denmark in this increasingly complex mediascape. Through five research publications it examines various aspects of mobile communication during a period of transition from an old regime of mobile phones into a new regime of smartphones...... Danes" (co-written with Gitte Stald and omitted from this compilation due to copyright restrictions), is based on qualitative survey data from a sample of university students collected in the spring of 2011 and explores the contours of the emergent smartphone phenomenon and the motivations young Danes...

  3. SC-FDMA for mobile communications

    CERN Document Server

    Abd El-Samie, Fathi E

    2013-01-01

    SC-FDMA for Mobile Communications examines Single-Carrier Frequency Division Multiple Access (SC-FDMA). Explaining this rapidly evolving system for mobile communications, it describes its advantages and limitations and outlines possible solutions for addressing its current limitations. The book explores the emerging trend of cooperative communication with SC-FDMA and how it can improve the physical layer security. It considers the design of distributed coding schemes and protocols for wireless relay networks where users cooperate to send their data to the destination. Supplying you with the re

  4. Mobile Communication Signatures of Unemployment

    CERN Document Server

    Almaatouq, Abdullah; Pentland, Alex

    2016-01-01

    The mapping of populations socio-economic well-being is highly constrained by the logistics of censuses and surveys. Consequently, spatially detailed changes across scales of days, weeks, or months, or even year to year, are difficult to assess; thus the speed of which policies can be designed and evaluated is limited. However, recent studies have shown the value of mobile phone data as an enabling methodology for demographic modeling and measurement. In this work, we investigate whether indicators extracted from mobile phone usage can reveal information about the socio-economical status of microregions such as districts (i.e., average spatial resolution < 2.7km). For this we examine anonymized mobile phone metadata combined with beneficiaries records from unemployment benefit program. We find that aggregated activity, social, and mobility patterns strongly correlate with unemployment. Furthermore, we construct a simple model to produce accurate reconstruction of district level unemployment from their mobi...

  5. Mobile satellite communications for consumers

    Science.gov (United States)

    Noreen, Gary K.

    1991-11-01

    The RadioSat system based on MSAT satellites and scheduled for launch in 1994 is described. The RadioSat system will provide integrated communications and navigation services to consumers, including nationwide digital audio broadcasts, data broadcasts, precision navigation, and two-way voice and data communications. Particular attention is given to the MSAT satellite system capabilities and economics. It is concluded that the RadioSat system will be capable of providing a low-cost, highly flexible two-way communications for consumers that can be adapted to various applications.

  6. A satellite based telemetry link for a UAV application

    Science.gov (United States)

    Bloise, Anthony

    1995-01-01

    The requirements for a satellite based communication facility to service the needs of the Geographical Information System (GIS) data collection community are addressed in this paper. GIS data is supplied in the form of video imagery at sub-television rates in one or more spectral bands / polarizations laced with a position correlated data stream. The limitations and vicissitudes of using a terrestrial based telecommunications link to collect GIS data are illustrated from actual mission scenarios. The expectations from a satellite based communications link by the geophysical data collection community concerning satellite architecture, operating bands, bandwidth, footprint agility, up link and down link hardware configurations on the UAV, the Mobile Control Vehicle and at the Central Command and Data Collection Facility comprise the principle issues discussed in the first section of this paper. The final section of the paper discusses satellite based communication links would have an increased volume and scope of services the GIS data collection community could make available to the GIS user community, and the price the data collection community could afford to pay for access to the communication satellite described in the paper.

  7. International Marketing Communication in Mobile Phone Industry

    OpenAIRE

    GUO, JUNWEN

    2007-01-01

    The purpose of this study orients to the discussion of the applicability of Integrated Marketing Communication (IMC) in Chinese market, typically in the music mobile phone industry.This paper endeavors in contributing to the analysis of the local consumer behavior characteristics in the process of purchase decision making as well as shaping long-term attitude towards mobile phone brands, in order to discuss the effectiveness of the objective marketing strategy and the application of the Integ...

  8. Proceedings of the Workshop on Advanced Network and Technology Concepts for Mobile, Micro, and Personal Communications

    Science.gov (United States)

    Paul, Lori (Editor)

    1991-01-01

    The Workshop on Advanced Network and Technology Concepts for Mobile, Micro, and Personal Communications was held at NASA's JPL Laboratory on 30-31 May 1991. It provided a forum for reviewing the development of advanced network and technology concepts for turn-of-the-century telecommunications. The workshop was organized into three main categories: (1) Satellite-Based Networks (L-band, C-band, Ku-band, and Ka-band); (2) Terrestrial-Based Networks (cellular, CT2, PCN, GSM, and other networks); and (3) Hybrid Satellite/Terrestrial Networks. The proceedings contain presentation papers from each of the above categories.

  9. Mobile satellite communications - Vehicle antenna technology update

    Science.gov (United States)

    Bell, D.; Naderi, F. M.

    1986-01-01

    This paper discusses options for vehicle antennas to be used in mobile satellite communications systems. Two types of antennas are identified. A non-steerable, azimuthally omnidirectional antenna with a modest gain of 3 to 5 dBi is suggested when a low cost is desired. Alternatively, mechanically or electronically steerable antennas with a higher gain of 10 to 12 dBi are suggested to alleviate power and spectrum scarcity associated with mobile satellite communications. For steerable antennas, both open-loop and closed-loop pointing schemes are discussed. Monopulse and sequential lobing are proposed for the mechanically steered and electronically steered antennas, respectively. This paper suggests a hybrid open-loop/closed-loop pointing technique as the best performer in the mobile satellite environment.

  10. Multidimensional human dynamics in mobile phone communications.

    Science.gov (United States)

    Quadri, Christian; Zignani, Matteo; Capra, Lorenzo; Gaito, Sabrina; Rossi, Gian Paolo

    2014-01-01

    In today's technology-assisted society, social interactions may be expressed through a variety of techno-communication channels, including online social networks, email and mobile phones (calls, text messages). Consequently, a clear grasp of human behavior through the diverse communication media is considered a key factor in understanding the formation of the today's information society. So far, all previous research on user communication behavior has focused on a sole communication activity. In this paper we move forward another step on this research path by performing a multidimensional study of human sociality as an expression of the use of mobile phones. The paper focuses on user temporal communication behavior in the interplay between the two complementary communication media, text messages and phone calls, that represent the bi-dimensional scenario of analysis. Our study provides a theoretical framework for analyzing multidimensional bursts as the most general burst category, that includes one-dimensional bursts as the simplest case, and offers empirical evidence of their nature by following the combined phone call/text message communication patterns of approximately one million people over three-month period. This quantitative approach enables the design of a generative model rooted in the three most significant features of the multidimensional burst - the number of dimensions, prevalence and interleaving degree - able to reproduce the main media usage attitude. The other findings of the paper include a novel multidimensional burst detection algorithm and an insight analysis of the human media selection process.

  11. Multidimensional human dynamics in mobile phone communications.

    Directory of Open Access Journals (Sweden)

    Christian Quadri

    Full Text Available In today's technology-assisted society, social interactions may be expressed through a variety of techno-communication channels, including online social networks, email and mobile phones (calls, text messages. Consequently, a clear grasp of human behavior through the diverse communication media is considered a key factor in understanding the formation of the today's information society. So far, all previous research on user communication behavior has focused on a sole communication activity. In this paper we move forward another step on this research path by performing a multidimensional study of human sociality as an expression of the use of mobile phones. The paper focuses on user temporal communication behavior in the interplay between the two complementary communication media, text messages and phone calls, that represent the bi-dimensional scenario of analysis. Our study provides a theoretical framework for analyzing multidimensional bursts as the most general burst category, that includes one-dimensional bursts as the simplest case, and offers empirical evidence of their nature by following the combined phone call/text message communication patterns of approximately one million people over three-month period. This quantitative approach enables the design of a generative model rooted in the three most significant features of the multidimensional burst - the number of dimensions, prevalence and interleaving degree - able to reproduce the main media usage attitude. The other findings of the paper include a novel multidimensional burst detection algorithm and an insight analysis of the human media selection process.

  12. A phonology-free mobile communication app.

    Science.gov (United States)

    Kondapalli, Ananya; Zhang, Lee R; Patel, Shreya; Han, Xiao; Kim, Hee Jin; Li, Xintong; Altschuler, Eric L

    2016-11-01

    Aphasia - loss of comprehension or expression of language - is a devastating functional sequela of stroke. There are as yet no effective methods for rehabilitation of aphasia. An assistive device that allows aphasia patients to communicate and interact at speeds approaching real time is urgently needed. Behavioral and linguistic studies of aphasia patients show that they retain normal thinking processes and most aspects of language. They lack only phonology: the ability to translate (input) and/or output sounds (or written words) such as "ta-ble" into the image of a four-legged object with a top at which one works or eats. We have made a phonology-free communication mobile app that may be useful for patients with aphasia and other communication disorders. Particular innovations of our app include calling Google Images as a "subroutine" to allow a near-infinite number of choices (e.g. food or clothing items) for patients without having to make countless images, and by the use of animation for words, phrases or concepts that cannot be represented by a single image. We have tested our app successfully in one patient. The app may be of great benefit to patients with aphasia and other communication disorders. Implications for Rehabilitation We have made a phonology-free mobile communication app. This app may facilitate communication for patients with aphasia and other communication disorders.

  13. Communication cliques in mobile phone calling networks

    CERN Document Server

    Li, Ming-Xia; Jiang, Zhi-Qiang; Zhou, Wei-Xing

    2015-01-01

    People in modern societies form different social networks through numerous means of communication. These communication networks reflect different aspects of human's societal structure. The billing records of calls among mobile phone users enable us to construct a directed calling network (DCN) and its Bonferroni network (SVDCN) in which the preferential communications are statistically validated. Here we perform a comparative investigation of the cliques of the original DCN and its SVDCN constructed from the calling records of more than nine million individuals in Shanghai over a period of 110 days. We find that the statistical properties of the cliques of the two calling networks are qualitatively similar and the clique members in the DCN and the SVDCN exhibit idiosyncratic behaviors quantitatively. Members in large cliques are found to be spatially close to each other. Based on the clique degree profile of each mobile phone user, the most active users in the two calling networks can be classified in to seve...

  14. Detection of Convective Initiation Using Meteorological Imager Onboard Communication, Ocean, and Meteorological Satellite Based on Machine Learning Approaches

    Directory of Open Access Journals (Sweden)

    Hyangsun Han

    2015-07-01

    Full Text Available As convective clouds in Northeast Asia are accompanied by various hazards related with heavy rainfall and thunderstorms, it is very important to detect convective initiation (CI in the region in order to mitigate damage by such hazards. In this study, a novel approach for CI detection using images from Meteorological Imager (MI, a payload of the Communication, Ocean, and Meteorological Satellite (COMS, was developed by improving the criteria of the interest fields of Rapidly Developing Cumulus Areas (RDCA derivation algorithm, an official CI detection algorithm for Multi-functional Transport SATellite-2 (MTSAT-2, based on three machine learning approaches—decision trees (DT, random forest (RF, and support vector machines (SVM. CI was defined as clouds within a 16 × 16 km window with the first detection of lightning occurrence at the center. A total of nine interest fields derived from visible, water vapor, and two thermal infrared images of MI obtained 15–75 min before the lightning occurrence were used as input variables for CI detection. RF produced slightly higher performance (probability of detection (POD of 75.5% and false alarm rate (FAR of 46.2% than DT (POD of 70.7% and FAR of 46.6% for detection of CI caused by migrating frontal cyclones and unstable atmosphere. SVM resulted in relatively poor performance with very high FAR ~83.3%. The averaged lead times of CI detection based on the DT and RF models were 36.8 and 37.7 min, respectively. This implies that CI over Northeast Asia can be forecasted ~30–45 min in advance using COMS MI data.

  15. Application of Mobile Router to Military Communications

    Science.gov (United States)

    Stewart, David H.; Ivancic, William D.; Bell, Terry L.; Kachmar, Brian A.; Shell, Dan; Leung, Kent

    2002-01-01

    Cisco Systems and NASA Glenn Research Center under a NASA Space Act Agreement have been performing joint networking research to apply Internet technologies and protocols to space-based communications. During this time, Cisco Systems developed the mobile-router which NASA and Cisco jointly tested. The early field trials of this technology have been successfully completed. The mobile-router is software code that resides in a network router. A Mobile-Router allows entire networks to roam while maintaining connectivity to the Internet. This router code is pertinent to a myriad of applications for both the government and commercial sectors. This technology will be applied to the wireless battlefield. NASA and the Department of Defense will utilize this technology for near-planetary observation and sensing spacecraft. It is the enabling technology for communication via the Internet or Intranets to aircraft. Information such as weather, air traffic control, voice and video can be easily and inexpensively transmitted to the aircraft using Internet protocols. The mobile router can be incorporated into emergency vehicles particularly ambulances and life-flight aircraft to provide real-time connectivity back to the hospital and healthcare experts. Commercial applications include entertainment services, IP telephone, and Internet connectivity for cruise ships, commercial shipping, tour busses, aircraft, and eventually cars. This paper will briefly describe the mobile router operation. An upcoming wide area network field test with application to US Coast Guard communications will be described. The paper will also highlight military and government networks that will benefit from the deployment of mobile router and the associated applications.

  16. Communication cliques in mobile phone calling networks

    Science.gov (United States)

    Li, Ming-Xia; Xie, Wen-Jie; Jiang, Zhi-Qiang; Zhou, Wei-Xing

    2015-11-01

    People in modern societies form different social networks through numerous means of communication. These communication networks reflect different aspects of human's societal structure. The billing records of calls among mobile phone users enable us to construct a directed calling network (DCN) and its Bonferroni network (SVDCN) in which the preferential communications are statistically validated. Here we perform a comparative investigation of the cliques of the original DCN and its SVDCN constructed from the calling records of more than nine million individuals in Shanghai over a period of 110 days. We find that the statistical properties of the cliques of the two calling networks are qualitatively similar and the clique members in the DCN and the SVDCN exhibit idiosyncratic behaviors quantitatively. Members in large cliques are found to be spatially close to each other. Based on the clique degree profile of each mobile phone user, the most active users in the two calling networks can be classified in to several groups. The users in different groups are found to have different calling behaviors. Our study unveils interesting communication behaviors among mobile phone users that are densely connected to each other.

  17. Future power sources for mobile communications

    Energy Technology Data Exchange (ETDEWEB)

    Green, K.; Wilson, J.C. [Defence Evaluation and Research Agency, Gosport (United Kingdom)

    2001-02-01

    This paper focuses on the development of new technologies to meet the demand for improved power sources for mobile communications, and discusses lithium ion and lithium polymer batteries. Fuel cell technology and development, hydrogen storage, and direct methanol fuel cells are examined and details are given of the development of fuel cells aimed at the mobile phone and the electric vehicle markets. The development of electrochemical double layer capacitors (EDLC) is also discussed, and research to improve energy densities of EDLCs is noted. Information on available batteries (nickel cadmium, nickel metal hydride, and lithium ion), and fuel cells (direct methanol and hydrogen/air polymer electrolyte membrane) is tabulated.

  18. Slotted PIFA for Mobile Communication Devices

    Directory of Open Access Journals (Sweden)

    J. Bartolic

    2008-12-01

    Full Text Available Slotted PIFA with capacitive loading for operation in the 880 / 960 MHz band is presented. The PIFA is intended for mobile terminals in GSM mobile communication network. The antenna is placed on a ground plane with dimensions of an average handheld device. It is optimized by using electromagnetic simulator and a prototype is manufactured. Calculated and measured results agree very well. Input impedance matching with SWR < 3 in the whole band was achieved. Maximum gain of 3.2 dBi is measured. Preliminary studies of the influence of the user's head and hand on the antenna characteristics have been performed.

  19. Antenna technology for advanced mobile communication systems

    Science.gov (United States)

    Rammos, Emmanuel; Roederer, Antoine; Rogard, Roger

    1988-01-01

    The onboard antenna front end is the key subsystem conditioning configuration and performance of mobile communication satellites. The objectives of this paper are to demonstrate this key role and to review L-band satellite antenna technology for earth coverage and regional applications. Multibeam arrays are first discussed, then unfurlable and inflatable reflector antennas are described. These technologies are now qualified in Europe for future mobile systems, for which the optimum choice of antenna technology has been found to be the key to efficient use of spectrum and power resources.

  20. Future mobile communications LTE optimization and mobile network virtualization

    CERN Document Server

    Zaki, Yasir

    2012-01-01

    The key to a successful future mobile communication system lies in the design of its radio scheduler. One of the key challenges of the radio scheduler is how to provide the right balance between Quality of Service (QoS) guarantees and the overall system performance. Yasir Zaki proposes innovative solutions for the design of the Long Term Evolution (LTE) radio scheduler and presents several LTE radio scheduler analytical models that can be used as efficient tools for radio dimensioning. The author also introduces a novel wireless network virtualization framework and highlights the potential gai

  1. Hybrid Mobile Communication Networks for Planetary Exploration

    Science.gov (United States)

    Alena, Richard; Lee, Charles; Walker, Edward; Osenfort, John; Stone, Thom

    2007-01-01

    A paper discusses the continuing work of the Mobile Exploration System Project, which has been performing studies toward the design of hybrid communication networks for future exploratory missions to remote planets. A typical network could include stationary radio transceivers on a remote planet, mobile radio transceivers carried by humans and robots on the planet, terrestrial units connected via the Internet to an interplanetary communication system, and radio relay transceivers aboard spacecraft in orbit about the planet. Prior studies have included tests on prototypes of these networks deployed in Arctic and desert regions chosen to approximate environmental conditions on Mars. Starting from the findings of the prior studies, the paper discusses methods of analysis, design, and testing of the hybrid communication networks. It identifies key radio-frequency (RF) and network engineering issues. Notable among these issues is the study of wireless LAN throughput loss due to repeater use, RF signal strength, and network latency variations. Another major issue is that of using RF-link analysis to ensure adequate link margin in the face of statistical variations in signal strengths.

  2. Mobile Communication, Public Participation and E-Governance in China

    DEFF Research Database (Denmark)

    Liu, Jun; Zhao, Hui

    2010-01-01

    China has become the biggest mobile communication carrier in the world since 2001. Advanced technologies create a communication revolution, and the individual, through the advent of mobile media, has become an active participant in this process. This study investigates the mobile phone’s impact...

  3. Geographical dispersal of mobile communication networks

    Science.gov (United States)

    Lambiotte, Renaud; Blondel, Vincent D.; de Kerchove, Cristobald; Huens, Etienne; Prieur, Christophe; Smoreda, Zbigniew; Van Dooren, Paul

    2008-09-01

    In this paper, we analyze statistical properties of a communication network constructed from the records of a mobile phone company. The network consists of 2.5 million customers that have placed 810 million communications (phone calls and text messages) over a period of 6 months and for whom we have geographical home localization information. It is shown that the degree distribution in this network has a power-law degree distribution k-5 and that the probability that two customers are connected by a link follows a gravity model, i.e. decreases as d-2, where d is the distance between the customers. We also consider the geographical extension of communication triangles and we show that communication triangles are not only composed of geographically adjacent nodes but that they may extend over large distances. This last property is not captured by the existing models of geographical networks and in a last section we propose a new model that reproduces the observed property. Our model, which is based on the migration and on the local adaptation of agents, is then studied analytically and the resulting predictions are confirmed by computer simulations.

  4. A Group Communication Approach for Mobile Computing Mobile Channel: An ISIS Tool for Mobile Services

    Science.gov (United States)

    1994-05-01

    of mobile hosts. However, these approaches require complicated protocols for handshaking and buffering , and fault-tolerance is not often addressed. On...view layer I sis 4- channel layer -- I~•• Network Newr IVF (U°P1 VF (uUPl channel to other servers to another client Figure 1.1 MobileChannel...necessary for any communication. When multiple processes need to synchronize, a handshake of two processes introduces a handshake time, and thus, buffering

  5. Consensus in networks of mobile communicating agents

    Science.gov (United States)

    Baronchelli, Andrea; Díaz-Guilera, Albert

    2012-01-01

    Populations of mobile and communicating agents describe a vast array of technological and natural systems, ranging from sensor networks to animal groups. Here, we investigate how a group-level agreement may emerge in the continuously evolving network defined by the local interactions of the moving individuals. We adopt a general scheme of motion in two dimensions and we let the individuals interact through the minimal naming game, a prototypical scheme to investigate social consensus. We distinguish different regimes of convergence determined by the emission range of the agents and by their mobility, and we identify the corresponding scaling behaviors of the consensus time. In the same way, we rationalize also the behavior of the maximum memory used during the convergence process, which determines the minimum cognitive/storage capacity needed by the individuals. Overall, we believe that the simple and general model presented in this paper can represent a helpful reference for a better understanding of the behavior of populations of mobile agents.

  6. Principles of mobile computing and communications

    CERN Document Server

    Othman, Mazliza

    2007-01-01

    Introduction Mobile Computing Applications Evolution of Wireless Networks and Services Summary Cellular Network Architecture UMTS Architecture Public Land Mobile Network Interfaces User Authentication Frequency Reuse Channel Assignment Location Registration and Update Handover Procedures CDMA The Move toward 3G Networks Wireless Local Area Networks IEEE 802.11 Standard IEEE 802.11b Standard (Wi-Fi) IEEE 802.11a Standard IEEE 802.11g Standard HIPERLAN/2 IEEE 802.1x Standard IEEE 802.11i Standard IEEE 802.11e Standard Security Issues IP over 802.11 WLAN Integrating 802.11 WLAN and UMTS Summary Wireless Personal Area Networks HomeRF Bluetooth Technology IEEE 802.15.3 Standard Home Area Networks Summary Wireless Sensor Networks Applications of WSNs Requirements for WSNs WSN Architecture The 802.15.4 Standard The ZigBee Protocol Power Conservation Techniques Network and Communications Configuration of Sensor Networks WSN and Emergency Response Applications Summary Mobile Ad Hoc Networks AODV DSR OLSR TBRPF Summary...

  7. Wireless Communication for Mobile Robots Using Commercial System

    Directory of Open Access Journals (Sweden)

    Humairah Mansor

    2012-01-01

    Full Text Available Commercial mobile robots provide good platform for the  study and development of algorithms for wireless mobile communication of devices. E-Puck is a good example, with wireless communication utilising Bluetooth among others. However, the limitations of Bluetooth communications lead to the investigation of using X-Bee module as an alternative. This is to allow the E-Puck to communicate with a computer and other mobile robots using specified Zigbee protocol. This paper presents X-Bee module as wireless communication method between computer and E-Pucks and the way they exchange data.

  8. Optimized Communication of Group Mobility in WPAN

    Directory of Open Access Journals (Sweden)

    Suman Lata

    2016-03-01

    Full Text Available ZigBee is a low cost, low-power consumption and long battery life network that is based on the IEEE 802.15.4 standard; which is most usually used to transfer low data rates information in the Wireless Personal Area Network (WPAN. In the Wireless Personal Area Network (WPAN network, capability of sensor network and mobile network are combined that have energy limit and sensing range limits. Here a network is composed of a number of Sub-Network or groups with the selection of group leader. Group formation is defined under sensing range limit, density limit and type of nodes. The selection of group leader is defined under velocity analysis, energy and average distance after that inter group and intra group communication is performed and then Handoff mechanism is performed when nodes switch the group or group switch the base station.

  9. SAW based systems for mobile communications satellites

    Science.gov (United States)

    Peach, R. C.; Miller, N.; Lee, M.

    1993-01-01

    Modern mobile communications satellites, such as INMARSAT 3, EMS, and ARTEMIS, use advanced onboard processing to make efficient use of the available L-band spectrum. In all of these cases, high performance surface acoustic wave (SAW) devices are used. SAW filters can provide high selectivity (100-200 kHz transition widths), combined with flat amplitude and linear phase characteristics; their simple construction and radiation hardness also makes them especially suitable for space applications. An overview of the architectures used in the above systems, describing the technologies employed, and the use of bandwidth switchable SAW filtering (BSSF) is given. The tradeoffs to be considered when specifying a SAW based system are analyzed, using both theoretical and experimental data. Empirical rules for estimating SAW filter performance are given. Achievable performance is illustrated using data from the INMARSAT 3 engineering model (EM) processors.

  10. Cryptanalysis and improvement of quantum secure communication network protocol with entangled photons for mobile communications

    Science.gov (United States)

    Gao, Gan

    2014-12-01

    Recently, a communication protocol called controlled bidirectional quantum secret direct communication for mobile networks was proposed by Chou et al (2014 Mobile Netw. Appl. 19 121). We study the security of the proposed communication protocol and find that it is not secure. The controller, Telecom Company, may eavesdrop secret messages from mobile devices without being detected. Finally, we give a possible improvement of the communication protocol.

  11. Passively Mobile Communicating Logarithmic Space Machines

    CERN Document Server

    Chatzigiannakis, Ioannis; Nikolaou, Stavros; Pavlogiannis, Andreas; Spirakis, Paul G

    2010-01-01

    We propose a new theoretical model for passively mobile Wireless Sensor Networks. We call it the PALOMA model, standing for PAssively mobile LOgarithmic space MAchines. The main modification w.r.t. the Population Protocol model is that agents now, instead of being automata, are Turing Machines whose memory is logarithmic in the population size n. Note that the new model is still easily implementable with current technology. We focus on complete communication graphs. We define the complexity class PLM, consisting of all symmetric predicates on input assignments that are stably computable by the PALOMA model. We assume that the agents are initially identical. Surprisingly, it turns out that the PALOMA model can assign unique consecutive ids to the agents and inform them of the population size! This allows us to give a direct simulation of a Deterministic Turing Machine of O(nlogn) space, thus, establishing that any symmetric predicate in SPACE(nlogn) also belongs to PLM. We next prove that the PALOMA model can ...

  12. Mobile Communication, Popular Protests and Citizenship in China

    DEFF Research Database (Denmark)

    Liu, Jun

    2015-01-01

    A reprint of the artile Liu, J., “Mobile Communication, Popular Protests and Citizenship in China,” Modern Asian Studies 47, no. 3 (2013): 995-1018.......A reprint of the artile Liu, J., “Mobile Communication, Popular Protests and Citizenship in China,” Modern Asian Studies 47, no. 3 (2013): 995-1018....

  13. Always connected: a longitudinal field study of mobile communication

    NARCIS (Netherlands)

    Peters, O.; Ben Allouch, Soumaya

    2005-01-01

    Twenty-five novice users of a new mobile communication device were closely tracked for a period of three months. The results of this longitudinal field study show that people’s motivations for using mobile communication technology are initially influenced more strongly by their perceptions about the

  14. Leveraging mobile computing and communication technologies in education

    DEFF Research Database (Denmark)

    Annan, Nana Kofi

    The emergence of mobile computing and communication technologies has come with it, an unprecedented transformation in digitalising every aspect of human activities. This transformation has brought about a high degree of mobility in the way knowledge is constructed, processed, stored...... and disseminated through the use of portable information and communication technologies (ICTs) such as smart phones, tablets, personal computers and laptop computers. These mobile devices use mobile communication infrastructure to promote the mobility affordances for human activities anywhere and anytime. Although...... education and technology have evolved in tandem over the past years, this dissertation recognises the lapse that there is, in not being able to effectively leverage technology to improve education delivery by most educators. The study appreciates the enormousness of mobile computing and communication...

  15. Mobile Communication and Civic Engagement in South Korea

    DEFF Research Database (Denmark)

    Lee, Hoon; Kwak, Nojin; Campbell, Scott

    2014-01-01

    This study aims to extend the literature on mobile communication by demonstrating that multifaceted mobile practices work in coordination with one another to predict enhanced engagement in public life. Using a national survey of adults in South Korea, we show that informational mobile phone use...

  16. Value-Based Communication Preservation for Mobile Robots

    Science.gov (United States)

    2006-01-01

    Value-Based Communication Preservation for Mobile Robots Matthew Powers and Tucker Balch Borg Lab College of Computing Georgia Institute of...SUBTITLE Value-Based Communication Preservation for Mobile Robots 5a. CONTRACT NUMBER 5b. GRANT NUMBER 5c. PROGRAM ELEMENT NUMBER 6. AUTHOR(S) 5d...for Mobile Robots 3 to reach nodes in the network and the identities of other nodes in the network. The algorithm explained below relies on this type

  17. Mobile Communication, Popular Protests and Citizenship in China

    DEFF Research Database (Denmark)

    Liu, Jun

    2013-01-01

    Digital telecommunication technology has expanded the potential of the mobile phone to be increasingly used as a weapon against authoritarian rule and censorship. Since the content of mobile communication is unpredictable and unregulated, mobile phones have the potential to breach state-sponsored......Digital telecommunication technology has expanded the potential of the mobile phone to be increasingly used as a weapon against authoritarian rule and censorship. Since the content of mobile communication is unpredictable and unregulated, mobile phones have the potential to breach state......-sponsored information blockage. This in turn helps the Chinese people to maintain contact with each other, receive information from outside the country, and make political waves in an aggressive battle for control over information. This paper examines spontaneous mobilization via mobile phones, with a focus on two...

  18. Mobile social closeness and communication patterns

    OpenAIRE

    Phithakkitnukoon, Santi; Dantu, Ram

    2010-01-01

    As mobile networks expand rapidly to facilitate the rising number of mobile phone population, more mobile social services are being developed and offered. To create an efficient social functionality, characteristics of mobile social network must be studied. Social closeness is one of the basic fundamentals of any kind of social networking. In this paper, closeness in mobile social network is the subject of the study, from which social grouping scheme is proposed and validated against the feed...

  19. A generalized transmultiplexer and its application to mobile satellite communications

    Science.gov (United States)

    Ichiyoshi, Osamu

    A generalization of digital transmultiplexer technology is presented. The proposed method can realize transmultiplexer (TMUX) and transdemultiplexer (TDUX) filter banks whose element filters have bandwidths greater than the channel spacing frequency. This feature is useful in many communications applications. As an example, a satellite switched (SS) Frequency Division Multiple Access (FDMA) system is proposed for spot beam satellite communications, particularly for mobile satellite communications.

  20. Future cooperative communication systems driven by social mobile networks

    DEFF Research Database (Denmark)

    Blázovics, L.; Varga, C.; Bamford, W.

    2011-01-01

    In this work we are underlining the importance of social mobile networks for upcoming cooperative communication systems. The assumption of this work is that future mobile communication systems will incorporate user cooperation, i.e. a combination of cellular access in parallel with ongoing short...... range links to the neighboring devices. It has been shown that user cooperation enables higher data rates, better spectral efficiencies, and reduces the energy consumption of the mobile unit. In this work the social mobile networks are identified to be a fertile ground to facilitate the cooperative use...... cases. By the example of the Gedda-Headz gaming community, possible links between cooperative mobile communication and social mobile networks are shown....

  1. Inferring human mobility using communication patterns

    CERN Document Server

    Palchykov, Vasyl; Jo, Hang-Hyun; Saramäki, Jari; Pan, Raj Kumar

    2014-01-01

    Understanding the patterns of mobility of individuals is crucial for a number of reasons, from city planning to disaster management. There are two common ways of quantifying the amount of travel between locations: by direct observations that often involve privacy issues, e.g., tracking mobile phone locations, or by estimations from models. Typically, such models build on accurate knowledge of the population size at each location. However, when this information is not readily available, their applicability is rather limited. As mobile phones are ubiquitous, our aim is to investigate if mobility patterns can be inferred from aggregated mobile phone call data. Using data released by Orange for Ivory Coast, we show that human mobility is well predicted by a simple model based on the frequency of mobile phone calls between two locations and their geographical distance. We argue that the strength of the model comes from directly incorporating the social dimension of mobility. Furthermore, as only aggregated call da...

  2. mCell: Facilitating Mobile Communication of Small Groups

    Directory of Open Access Journals (Sweden)

    Jyri Virtanen

    2008-01-01

    Full Text Available Mobile communication technology offers a potential platform for new types of communication applications. Here, we describe the development and experiences with a mobile group communication application, mCell, that runs on a mobile phone. We present the underlying design implications, the application implementation, and a user study, where three groups used the application for one month. The findings of the user study reveal general user experiences with the application and show different patterns of usage depending on the social setting of the group and how the preferred features vary accordingly.

  3. Mobile Communications and Mobile Commerce: Conceptual Frames to Grasp the Global Tectonic Shifts

    DEFF Research Database (Denmark)

    2006-01-01

    In this keynote chapter, we provide an overview of the emerging global landscape of mobile communications and mobile commerce, circa 2005. We introduce the four core CLIP functionalities - communications (C), locatability (L), information (I) exchange, and payment (P) facilitation - on which m......-commerce systems and services are based. We then explore the various requirements for creating successful mobile commerce portals, or m-portals, using the CLIP functionalities as well as ways for personalization, permission, and specification of service formats and content....

  4. Secure communication protocol for mobile multimedia applications

    OpenAIRE

    Komninos, N.; Honary, B.; Darnell, M.

    2000-01-01

    Data transmission over wireless communication networks is increasing rapidly and security has become a very important issue. The main considerations of secure communication systems are authentication, key distribution, and data transfer. This paper describes a secure communication protocol (SCP), which provides privacy and data integrity for end-to-end data transmission over wireless communication systems.

  5. The User-level Security of Mobile Communication Systems

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    This paper studies the user-level security of mobile systems. The current mobile phone users trust the invisible security of the 2G systems. The evolution from the second-generation mobile systems (2G) to the third generation systems (3G) will introduce the threats and opportunities of the Internet to the world of mobile communications. From the technical point of view, the new security requirements are similar to the security requirements met with today in a company Intranet environment. There is, however, one great difference; the charge paid for accessing the service. In future the users of mobile systems will have to be more aware of the security issues.

  6. Secure Communication and Access Control for Mobile Web Service Provisioning

    CERN Document Server

    Srirama, Satish Narayana

    2010-01-01

    It is now feasible to host basic web services on a smart phone due to the advances in wireless devices and mobile communication technologies. While the applications are quite welcoming, the ability to provide secure and reliable communication in the vulnerable and volatile mobile ad-hoc topologies is vastly becoming necessary. The paper mainly addresses the details and issues in providing secured communication and access control for the mobile web service provisioning domain. While the basic message-level security can be provided, providing proper access control mechanisms for the Mobile Host still poses a great challenge. This paper discusses details of secure communication and proposes the distributed semantics-based authorization mechanism.

  7. Mobile Alerts / Center for the Study of Mobile Devices and Communications

    OpenAIRE

    Center for the Study of Mobile Devices and Communications; Singh, Gurminder

    2012-01-01

    The use of mobile devices has become an integral part of our life today. Both on personal as well as business fronts, mobile devices have become a key mechanism for us to stay connected to the outside world. Military depends on this technology for a number of mission critical applications including operations tasking and commands and control. In the civilian world, mobile devices have become indispensable for business as well as personal communication. Mobile alerts – the notifica...

  8. Mobile communications by satellite in Europe - Overview of ESA activities

    Science.gov (United States)

    Rogard, R.; Jongejans, A.; Bartholome, P.

    ESA is conducting studies aimed at the definition of a Land Mobile Satellite System for digital communications within the Western European region, in view of recent market studies indicating the existence of substantial demand for the provision of mobile communications services by satellite. Attention is presently given to the 'Prodat' low-rate system and its ARQ-coding scheme, Prodat's CDMA return link (noting interference protection and spectrum use efficiency criteria) and the aims of Prodat performance trials.

  9. Mobile Router Testing with Diverse RF Communications Links

    Science.gov (United States)

    Brooks, David; Hoder, Doug; Wilkins, Ryan

    2004-01-01

    This is a short report on demonstrations using Mobile IP and several diverse physical communications links to connect a mobile network to a fixed IPv4 internet. The first section is a description of the equipment used, followed by descriptions of the tests, the theoretical results, and finally conclusions and the actual data.

  10. Dynamic Pathloss Model for Future Mobile Communication Networks

    DEFF Research Database (Denmark)

    Kumar, Ambuj; Mihovska, Albena Dimitrova; Prasad, Ramjee

    2016-01-01

    — Future mobile communication networks (MCNs) are expected to be more intelligent and proactive based on new capabilities that increase agility and performance. However, for any successful mobile network service, the dexterity in network deployment is a key factor. The efficiency of the network...... that incorporates the environmental dynamics factor in the propagation model for intelligent and proactively iterative networks...

  11. Mobile services over short range communication

    OpenAIRE

    Wendlandt, Kai; Kammann, Jens; Strang, Thomas

    2001-01-01

    This paper highlights issues of migrating from mobile internet access towards a distributed service platform. Starting with an analysis of different bearer services the paper surveys integration aspects of location and situation aware services on programmable mobile devices, based on a typical scenario.

  12. Cloud Computing in Mobile Communication Networks

    Institute of Scientific and Technical Information of China (English)

    Xinzhi Ouyang

    2011-01-01

    Cloud computing makes computing power universally available and provides flexibility in resource acquisition. It allows for scalable provision of services and more reasonable use of resources. This article considers cloud service deployment and virtualization from the perspective of mobile operators. A solution is proposed that allows mobile operators to maximize profits with minimal investment,

  13. Adaptation Methods in Mobile Communication Networks

    OpenAIRE

    Vladimir Wieser

    2003-01-01

    Adaptation methods are the main tool for transmission rate maximization through the mobile channel and today the great attention is directed to them not only in theoretical domain but in standardization process, too. The review of adaptation methods for system and technical parameters of mobile cellular networks (2.5G and 3G) is carricd out.

  14. GSM-PKI solution enabling secure mobile communications.

    Science.gov (United States)

    Jelekäinen, Pekka

    2004-03-31

    Because of its wide distribution and ease of use, the mobile phone, as a reliable personal communications channel, offers an excellent basis for the provision of reliable electronic communications services. In Finland, ca. 75% of the citizens have a mobile phone and, at present and most likely also in the future, it is the most widely spread service channel allowing reliable electronic communications. Despite the restricted functions of the mobile phone, the citizens can use the phone also as a communications medium. In 2001, the Finns sent over 1 billion SMS messages. In Finland, TeliaSonera Finland Oyi and the Population Register Centre (PRC) have closed a co-operation agreement with the aim of creating a mobile phone service for the electronic identification of a person. The co-operation launched is a significant development project from the perspective of the citizens. As a result, the consumers will have a new alternative for reliable electronic communications and commerce in data networks in addition to the electronic identification card. In the future, it will be possible to use the services of both public administration and the private sector by means of a mobile phone more reliably than before, without a physical visit, e.g. to a health centre or to another provider of healthcare services. The possibility of identification and signature by a mobile phone allows an easier provision of versatile services irrespective of time and place, because, in addition to voice, text message, and WAP functions, the service can be utilised also in communications services through the Internet, in which case, the mobile phone acts like a card reader. From the perspective of reliable personal mobile communications, the healthcare sector is one of the most significant and challenging application areas.

  15. Touch the World - and communicate the experience via Mobile Phones

    DEFF Research Database (Denmark)

    Bang, Jørgen; Dalsgaard, Christian; Engelbrecht, Kristian

    2009-01-01

    as a vehicle to enhance pupil’s learning by making their own documentation of their experiences and by communicating these experiences to fellow pupils. We argue that mobile phones have a potential to support these learning processes as a personalised tool for documentation and communication.......The paper presents a project involving school children’s use of mobile phones at Moesgaard Museum, in Aarhus, Denmark. A special anthropological exhibition called “Touch the World” is arranged around items supplied by UNESCO. The paper will discuss the pedagogical perspective of using mobile phones...

  16. Touch the World - and communicate the experience via Mobile Phones

    DEFF Research Database (Denmark)

    Bang, Jørgen; Dalsgaard, Christian; Engelbrecht, Kristian

    2009-01-01

    as a vehicle to enhance pupil’s learning by making their own documentation of their experiences and by communicating these experiences to fellow pupils. We argue that mobile phones have a potential to support these learning processes as a personalised tool for documentation and communication.......The paper presents a project involving school children’s use of mobile phones at Moesgaard Museum, in Aarhus, Denmark. A special anthropological exhibition called “Touch the World” is arranged around items supplied by UNESCO. The paper will discuss the pedagogical perspective of using mobile phones...

  17. Studying Mobile Media Cultural Technologies, Mobile Communication, and the IPhone

    CERN Document Server

    Hjorth, Larissa; Richardson, Ingrid

    2012-01-01

    The iPhone represents an important moment in both the short history of mobile media and the long history of cultural technologies. Like the Walkman of the 1980s, it marks a juncture in which notions about identity, individualism, lifestyle and sociality require rearticulation. this book explores not only the iPhone's particular characteristics, uses and "affects," but also how the "iPhone moment" functions as a barometer for broader patterns of change. In the iPhone moment, this study considers the convergent trajectories in the evolution of digital and mobile culture, and

  18. Design of Hybrid Mobile Communication Networks for Planetary Exploration

    Science.gov (United States)

    Alena, Richard L.; Ossenfort, John; Lee, Charles; Walker, Edward; Stone, Thom

    2004-01-01

    The Mobile Exploration System Project (MEX) at NASA Ames Research Center has been conducting studies into hybrid communication networks for future planetary missions. These networks consist of space-based communication assets connected to ground-based Internets and planetary surface-based mobile wireless networks. These hybrid mobile networks have been deployed in rugged field locations in the American desert and the Canadian arctic for support of science and simulation activities on at least six occasions. This work has been conducted over the past five years resulting in evolving architectural complexity, improved component characteristics and better analysis and test methods. A rich set of data and techniques have resulted from the development and field testing of the communication network during field expeditions such as the Haughton Mars Project and NASA Mobile Agents Project.

  19. One Time Secret Key Mechanism for Mobile Communication

    Directory of Open Access Journals (Sweden)

    Vasu.R

    2011-06-01

    Full Text Available Mobile communication is playing a vital role in the current technical world and becoming more popularand prevalent across the world everyday at one end and many security problems are arising at the otherend. To overcome these security problems many security mechanisms for mobile communications havebeen introduced in the literature. Among these mechanisms, authentication plays a quite important rolein the entire mobile network system and acts as the first defense against attackers since it ensures thecorrectness of the identities of distributed communication entities before they engage in any othercommunication activity. In this paper, we propose a novel authentication mechanism, called the nestedone-time secret mechanism, efficient for mobile communication environment which mainly focus on thesecurity issues of mobile communication and also overcome the problem of high computational andcommunication cost with good result in reducing the cost of computational and communication cost fromthe existing system, the cost reduction is possible by reducing the usage of the memory for key generationin the proposed scheme and the experimental result of the proposed scheme is also been showed in thispaper.

  20. Pervasive Mobile and Ambient Wireless Communications COST Action 2100

    CERN Document Server

    Zanella, Alberto

    2012-01-01

    Pervasive Mobile and Ambient Wireless Communications reports the findings of COST 2100, a project of the European intergovernmental COST framework addressing various topics currently emerging in mobile and wireless communications. Drawing on experience developed in this and earlier COST projects, the text represents the final outcome of collaborative work involving more than 500 researchers in 140 institutions and 30 countries (including outside Europe). The book’s subject matter includes: • transmission techniques; • signal processing; • radio channel modelling and measurement; • radio network issues; and • recent paradigms including ultra-wideband, cooperative, vehicle-to-vehicle and body communications. The research reported comes from a variety of backgrounds: academic, equipment-manufacturing and operational. The information contained in this book will bring the study reported to a wider audience from all those spheres of work. Pervasive Mobile and Ambient Wireless Communications will be of i...

  1. Analysis of Maritime Mobile Satellite Communication Systems

    Science.gov (United States)

    1988-12-01

    Communications and Surveil- lance, IEE, Conference publication n.95, 13-15 Mar. 1973. 2. Y. Karasawa and T. Shiokawa , Characteristics of L-Band Multipath Fading... Shiokawa . Analysis of M-ultipath Fading due to Sea Suface Scattering in Maritime Satellite Communication, Technical Group on Antennas and Propagation. IECE

  2. Mobile Communications within the Deepwater Lifelines

    Science.gov (United States)

    2013-12-13

    and coordinates the rest of the functions on the motherboard (Farley 2007). Cellular smartphones provide an incredible array of functions (Rystrom...well as ship-to-shore communications using the full array of COTS commercial communication devices from laptops (Or other motherboard ) to smart phones

  3. 75 FR 8112 - In the Matter of Certain Mobile Telephones and Wireless Communication Devices Featuring Digital...

    Science.gov (United States)

    2010-02-23

    ... COMMISSION In the Matter of Certain Mobile Telephones and Wireless Communication Devices Featuring Digital... communication devices featuring digital cameras, and components thereof by reason of infringement of certain... mobile telephones or wireless communication devices featuring digital cameras, or ] components...

  4. 78 FR 32689 - Certain Portable Electronic Communications Devices, Including Mobile Phones and Components...

    Science.gov (United States)

    2013-05-31

    ... COMMISSION Certain Portable Electronic Communications Devices, Including Mobile Phones and Components Thereof... communications devices, including mobile phones and components thereof. The complaint names as respondents HTC... Trade Commission has received a complaint entitled Certain Portable Electronic Communications...

  5. Increasing clinical presence of mobile communication technology: avoiding the pitfalls.

    Science.gov (United States)

    Visvanathan, Akila; Gibb, Alan P; Brady, Richard R W

    2011-10-01

    Mobile communication technologies are employed in many diverse areas of healthcare delivery to provide improved quality and efficiency of communication and facilitate increased rapidity of data or information transfer. Mobile phones enable healthcare professionals to possess a portable platform from which to provide many healthcare-related applications and are a popular means to directly communicate with colleagues and patients. As involvement of mobile communication technology in healthcare delivery continues to rapidly expand, there are also important considerations of relevance to patient safety and security as a result. Here, we review the previous evidence of reported clinical risks associated with mobile communication technology, such as electromagnetic interference, confidentiality and data security, distraction/noise, infection control, and cross contamination. In conclusion, although mobile phones provide much putative potential improvement to healthcare delivery, further evaluation and research are required to both inform and protect health professionals and users of such technology in the healthcare environment and provide the evidence base to support the provision of clear and comprehensive guidelines.

  6. Older People and Mobile Communication in Two European Contexts

    Directory of Open Access Journals (Sweden)

    Mireia Fernández-Ardèvol

    2016-05-01

    Full Text Available We analyze the relationships seniors have with mobile communications in two different European contexts, Romania and Catalonia. By means of a qualitative approach, we describe the ways older individuals incorporate mobile phones in everyday life communication practices, and the motivations supporting these decisions. To understand motivations for using a given communication device –as the mobile phone– we took into account the channels individual has access to; individual’s personal interest on using available devices in everyday communications; the location of the members of the individual’s personal network; and the pricing system that determines the cost of mediated communication. The empirical analysis is based on two case studies conducted in Romania and in the metropolitan area of Barcelona (Catalonia in different moments, between 2010 and 2012. Participants were 60 years old or over. Information was gathered by means of semi-structured interviews that were recorded and transcribed, while a common methodological design allows an enriched insight. Besides gender, we take into account heterogeneity of ageing for a more nuanced analysis. This paper constitutes the first step in the exploration of common trends in the relationship seniors have with mobile communication in different European countries.

  7. Mobile Seamless Technology Enhanced CSL Oral Communication

    Science.gov (United States)

    Lan, Yu-Ju; Lin, Yen-Ting

    2016-01-01

    The current study aimed at investigating how mobile seamless technology can be used to enhance the pragmatic competence of learners of Chinese as a second language (CSL). 34 overseas CSL learners participated in this study. They were randomly assigned into two groups: the classroom group, executing language tasks in fake contexts in a traditional…

  8. The use of mobile satellite communication terminals

    Science.gov (United States)

    Law, P. A.

    The role of small portable terminals in military satellite systems is examined; the discussion embraces terminals with an antenna reflector diameter of seven meters or less. Emphasis is placed on the specification of MARMOSET (Marconi Mobile Satellite Earth Terminal). Also considered are ship-borne satellite terminals, the improved SCOT terminal, interoperability, reduced downlink power, and reliability and availability.

  9. Mobile Seamless Technology Enhanced CSL Oral Communication

    Science.gov (United States)

    Lan, Yu-Ju; Lin, Yen-Ting

    2016-01-01

    The current study aimed at investigating how mobile seamless technology can be used to enhance the pragmatic competence of learners of Chinese as a second language (CSL). 34 overseas CSL learners participated in this study. They were randomly assigned into two groups: the classroom group, executing language tasks in fake contexts in a traditional…

  10. High available and fault tolerant mobile communications infrastructure

    DEFF Research Database (Denmark)

    Beiroumi, Mohammad Zib

    2006-01-01

    as it is the case for many recovery techniques. In addition, the method does not require any modification to mobile clients. The Communicating Extended Finite State Machine (CEFSM) is used to model the behavior of the infrastructure applications. The model based recovery scheme is integrated in the application...... using rollback or replication techniques inapplicable. This dissertation presents a novel failure recovery approach based on a behavioral model of the communication protocols. The new recovery method is able to deal with software and hardware faults and is particularly suitable for mobile communications...... infrastructure. The method enables the faulty applications in the infrastructure to quickly and effectively resume their services to their mobile clients with no or minimal loss of work after failure. In our approach, we do not assume a specific fault behavior for example failstop or transient behavior...

  11. Market segmentation of mobile communications in SEE region

    Directory of Open Access Journals (Sweden)

    Domazet Anto

    2006-01-01

    Full Text Available In the focus of all activities are customers of mobile services on mobile communications market. As the basis of telecommunication network and services development, as also for creating an optimal marketing-mix from mobile operators' side, we have investigated the needs, motivations and customer behavior and have made analysis mobile communication customers on the SEE Region market. The aim of this analysis is identification of the regional segments and following their growth, size and profitability. At the end, we have contributed the suggestions for creating the marketing-mix using a strategy of marketing differentiation, which implicit optimal combination of all marketing-mix elements for each regional segment separately. For identified segments we have set up an estimation model of significant key factors on the particular segments, because of more efficient creation of marketing instruments.

  12. Distributed Mobile Robot Localization and Communication System for Special Interventions

    OpenAIRE

    Sales Gil, Jorge

    2011-01-01

    This thesis focuses on the development of a distributed mobile robot localization and communication system for special interventions like those carried out by fire-fighters in fire ground search and rescue. The use case scenario is related to the one described for the GUARDIANS EU project, where a swarm formation of mobile robots accompany a fire fighter during a rescue intervention in a warehouse. In this line, localizing the robots and the fire fighter during an indoor intervention with the...

  13. Minimizing Mobiles Communication Time Using Modified Binary Exponential Backoff Algorithm

    OpenAIRE

    Ibrahim Sayed Ahmad; Ali Kalakech; Seifedine Kadry

    2013-01-01

    The domain of wireless Local Area Networks (WLANs)is growing speedily as a consequence ofdevelopments in digital communications technology.The early adopters of this technology have mainlybeen vertical applicationthat places a premium on the mobility offered by such systems. Examples of thesetypes of applications consist of stocking control in depot environments,point of sale terminals, and rentalcar check-in. Furthermore to the mobility thatbecomes possible with wireless LANs; these systemsh...

  14. A highly innovative global broadband mobile communication system concept

    Science.gov (United States)

    Wittig, Manfred

    2010-04-01

    Global mobile communication systems deployed in the 1990s (Iridium and Globalstar) failed to achieve the expected market success. However, recently a second generation of these two LEO constellations have been or will be procured. This shows evidence that global mobile satellite communications are attractive for a certain class of users. Basic requirements for mobile satellite communication networks are global coverage at high elevation angles, continuous availability and most important attractive service offers. For the first two reasons LEO constellations were designed and deployed. The large number of required satellites (remember the original Teledesic concept was designed containing 860 satellites) increases the CAPEX and consequently the service cost. This is probably the major reason for the limited commercial success of Iridium and Globalstar. An ideal global mobile (broadband) communication system shall provide global coverage at high elevation angles (not below e.g. 30°) with the lowest number of satellites. This seems to be contradictory. However, a solution will be presented that achieves global coverage which requires only five satellites and achieves high elevation angles even at polar locations. This orbit constellation is to be complemented with innovative payloads to achieve cost efficient broadband mobile services all over the Globe. Innovative L/S-band payload concepts will be introduced as well as Ka-band payloads.

  15. Daily rhythms in mobile telephone communication

    CERN Document Server

    Aledavood, Talayeh; Roberts, Sam G B; Reed-Tsochas, Felix; Moro, Esteban; Dunbar, Robin I M; Saramäki, Jari

    2015-01-01

    Circadian rhythms are known to be important drivers of human activity and the recent availability of electronic records of human behaviour has provided fine-grained data of temporal patterns of activity on a large scale. Further, questionnaire studies have identified important individual differences in circadian rhythms, with people broadly categorised into morning-like or evening-like individuals. However, little is known about the social aspects of these circadian rhythms, or how they vary across individuals. In this study we use a unique 18-month dataset that combines mobile phone calls and questionnaire data to examine individual differences in the daily rhythms of mobile phone activity. We demonstrate clear individual differences in daily patterns of phone calls, and show that these individual differences are persistent despite a high degree of turnover in the individuals' social networks. Further, women's calls were longer than men's calls, especially during the evening and at night, and these calls wer...

  16. GaAs devices for new mobile communication systems application

    OpenAIRE

    Pettenpaul, E.; Schopf, K.J.

    1992-01-01

    A set of GaAs SMD devices has been developed for use in the new european mobile communication equipment, i.e. for DECT and PCN at 1900 and 1800 MHz, respectively. These devices cover the rf part of mobile communication terminals. The devices considered are a GaAs LNC chip for the receiver part, an upconversion mixer MMIC, a prescaler and GaAs power MESFETs as end-stages for the transmitter. The complete DECT, PCN block circuit including GaAs and Si devices will be described.

  17. Space Mobile Network: A Near Earth Communication and Navigation Architecture

    Science.gov (United States)

    Israel, Dave J.; Heckler, Greg; Menrad, Robert J.

    2016-01-01

    This paper describes a Space Mobile Network architecture, the result of a recently completed NASA study exploring architectural concepts to produce a vision for the future Near Earth communications and navigation systems. The Space Mobile Network (SMN) incorporates technologies, such as Disruption Tolerant Networking (DTN) and optical communications, and new operations concepts, such as User Initiated Services, to provide user services analogous to a terrestrial smartphone user. The paper will describe the SMN Architecture, envisioned future operations concepts, opportunities for industry and international collaboration and interoperability, and technology development areas and goals.

  18. 5G: rethink mobile communications for 2020+.

    Science.gov (United States)

    Chih-Lin, I; Han, Shuangfeng; Xu, Zhikun; Sun, Qi; Pan, Zhengang

    2016-03-06

    The 5G network is anticipated to meet the challenging requirements of mobile traffic in the 2020s, which are characterized by super high data rate, low latency, high mobility, high energy efficiency and high traffic density. This paper provides an overview of China Mobile's 5G vision and potential solutions. Three key characteristics of 5G are analysed, i.e. super fast, soft and green. The main 5G R&D themes are further elaborated, which include five fundamental rethinkings of the traditional design methodologies. The 5G network design considerations are also discussed, with cloud radio access network, ultra-dense network, software defined network and network function virtualization examined as key potential solutions towards a green and soft 5G network. The paradigm shift to user-centric network operation from the traditional cell-centric operation is also investigated, where the decoupled downlink and uplink, control and data, and adaptive multiple connections provide sufficient means to achieve a user-centric 5G network with 'no more cells'. The software defined air interface is investigated under a uniform framework and can adaptively adapt the parameters to well satisfy various requirements in different 5G scenarios. © 2016 The Author(s).

  19. Can Mobile Technology Enable Knowledge Communication in a Learning Environment?

    DEFF Research Database (Denmark)

    Kampf, Constance; Islas Sedano, Carolina

    2008-01-01

    with technology in knowledge management systems.  So, is knowledge communication a process that can be technologically enabled?  In this presentation, we explore the possibilities of socio-technical interaction for knowledge communication through the use of a mobile phone game as a knowledge communication tool...... this mobile phone game to help next years' students navigated the CampusNet system in order to study for the exam.  The CampusNet system can be seen as a knowledge management technology situated within the social context of the Project Management course, and so the examples offered, in effect, demonstrate...... To be effective, knowledge management systems need to encompass both social processes and technical components (McDermott 2000),   On the other hand, knowledge communication as a concept has emerged not from the inspiration of technology, but partly from the social-technical challenge of dealing...

  20. Near field communication: getting in touch with mobile users.

    Science.gov (United States)

    Hoy, Matthew B

    2013-01-01

    Near field communication is a method for sending and receiving small amounts of data across very short distances wirelessly. This technology is already available in a number of mobile devices and has many possible uses, including electronic payment, access control, and information exchange. This article will explain the basic principles of near field communication, discuss some of the ways it can be used in libraries, and explore some possible concerns with the technology. A list of resources for additional information is also included.

  1. Cutting Last Wires for Mobile Communications by Microwave Power Transfer

    OpenAIRE

    Huang, Kaibin; Zhou, Xiangyun

    2014-01-01

    The advancements in microwave power transfer (MPT) over past decades have enabled wireless power transfer over long distances. The latest breakthroughs in wireless communication, namely massive MIMO, small cells and millimeter-wave communication, make wireless networks suitable platforms for implementing MPT. This can lead to the elimination of the "last wires" connecting mobile devices to the grid for recharging, thereby tackling a long-standing ICT grand challenge. Furthermore, the seamless...

  2. Open Innovation in Mobile and Convergent Communications

    Science.gov (United States)

    Jiménez, José

    The concept of open innovation seems to be very well suited to information and communication technologies. In the first place, as in any other field, the complexity of the new technology makes it necessary for companies to use ideas, processes and inventions from other players. As in any other field, we need the collaboration of the university, of SMEs, of inventors, and of the general public.

  3. Mobile Communication, Public Participation and E-Governance in China

    DEFF Research Database (Denmark)

    Liu, Jun; Zhao, Hui

    2010-01-01

    and took various civic actions again them. A rare sense of participation in public affairs is fostered through the use of mobile communication technology. The government must figure out how to improve the effective and regular information exchange and feedback top down and bottom up to raise the awareness...... and understanding among higher decision making agencies, government and the public....

  4. Always Connected: A Longitudinal Field Study of Mobile Communication

    NARCIS (Netherlands)

    Peters, O.; Ben Allouch, Soumaya

    2004-01-01

    Twenty-five novice users of a new mobile communication device, allowing them to be always connected to their e-mail, e-calendar and organizer via GPRS (General Packet Radio Service), were closely tracked for a period of three months. The benefits of being always connected, to be accessible at all ti

  5. The Role of Mobile Phones in Family Communication

    Science.gov (United States)

    Devitt, Kerry; Roker, Debi

    2009-01-01

    Whilst there is a wealth of research into family communication and family relationships, there is little information about whether (and if so how) mobile phones have impacted on these processes. The authors' study involved individual semi-structured interviews with 60 families, including parents/carers and young people aged 11-17, to investigate…

  6. Spread spectrum mobile communication experiment using ETS-V satellite

    Science.gov (United States)

    Ikegami, Tetsushi; Suzuki, Ryutaro; Kadowaki, Naoto; Taira, Shinichi; Sato, Nobuyasu

    1990-01-01

    The spread spectrum technique is attractive for application to mobile satellite communications, because of its random access capability, immunity to inter-system interference, and robustness to overloading. A novel direct sequence spread spectrum communication equipment is developed for land mobile satellite applications. The equipment is developed based on a matched filter technique to improve the initial acquisition performance. The data rate is 2.4 kilobits per sec. and the PN clock rate is 2.4552 mega-Hz. This equipment also has a function of measuring the multipath delay profile of land mobile satellite channel, making use of a correlation property of a PN code. This paper gives an outline of the equipment and the field test results with ETS-V satellite.

  7. A Review of QoS in Mobility Phillic Communication

    Directory of Open Access Journals (Sweden)

    Sumit Joshi

    2012-01-01

    Full Text Available This particular outlook represents, in brief the recent upcoming issues associated with QoS guarantee mobility in communications. Moreover it also presents a brief context of QoS attributes handling techniques thereby. Even more, it covers aspects of QoS fundamentals in deployment of mobility led approaches. There are different kinds of systems that facilitate different QoS attributes for variable classes of services. This review represents different types of approaches involved in the process of modern communication networks with respect to the QoS offered by a particular service. Moreover the parameters such as: delay, bandwidth, jitter etc. are system specific along with being service specific too. All the system types are actually a broad classification which involves different service primitives. In this review we focus mainly on mobility aspects of computing in the modern arena.

  8. Communication skills for mobile remote presence technology in clinical interactions.

    Science.gov (United States)

    Nestel, Debra; Sains, Parvinder; Wetzel, Cordula M; Nolan, Carmel; Tay, Ann; Kneebone, Roger L; Darzi, Ara W

    2007-01-01

    The use of mobile robotic units for teleconsultation means that the clinician's cognitive and attention skills are divided between tele-operation of the robotic unit and the consultation with the patient. We developed a communication guide based on evidence-based patient-centred interviewing and telephone conferencing skills. The communication guide was tested by five trainee surgeons in a pre- and post-test design. Each surgeon completed three simulated patient consultations. After reading the communication guide, trainees completed three further consultations. The trainees rated authenticity, degree of difficulty, familiarity of clinical presentation and confidence in using telepresence to manage the consultations. Their mean scores were 3.0-4.6, 2.2-4.0, 4.4-4.8 and 3.2-4.2 respectively (maximum possible score 5). The simulated patients rated their satisfaction with communication. Their ratings suggested that there were areas for communication skills development with mean scores ranging from 8.2 to 11.4 (maximum possible score = 15). Although we do not yet know enough about communicating with real patients using mobile robotic units, the communication guide appeared to be useful in our simulated interactions.

  9. A Simplified Geometric Channel Model for Mobile-to-Mobile Communications

    Directory of Open Access Journals (Sweden)

    K. B. Baltzis

    2011-12-01

    Full Text Available In Mobile-to-Mobile (M2M communications, the communicating nodes are surrounded by scatterers and equipped with low elevation antennas. This paper proposes a simple 2-D geometric scattering model for M2M channels. The model is also applicable in cellular systems when we employ low height base station antennas. In our approach, the scatterers are uniformly distributed in ellipses with arbitrary size and orientation around each communicating node. We provide simple formulas for the calculation of the angular spread and delay variation of the propagating signal. Simulation results verify the accuracy of the model. In order to validate the generalization of the approach, we compare it against notable models in the literature. As an application example, we investigate the impact of scatterer distribution and separation between mobiles on the angle and time of arrival statistics of the multipaths.

  10. Frequency Diversity for OFDM Mobile Communication via Underwater Acoustic Channels

    Institute of Scientific and Technical Information of China (English)

    Gang Qiao; Wei Wang; Ran Guo; Rehan Khan; Yue Wang

    2012-01-01

    The major constraint on the performance of orthogonal frequency division multiplexing (OFDM) based underwater acoustic (UWA) communication is to keep subcarriers orthogonal.In this paper,Doppler estimation and the respective compensation technique along with various diversity techniques were deliberated for OFDM-based systems best suited for underwater wireless information exchange.In practice,for mobile communication,adjustment and tuning of transducers in order to get spatial diversity is extremely difficult.Considering the relatively low coherence bandwidth in UWA,the frequency diversity design with the Doppler compensation function was elaborated here.The outfield experiments of mobile underwater acoustic communication (UWAC) based on OFDM were carried out with 0.17 bit/(s.Hz) spectral efficiency.The validity and the dependability of the scheme were also analyzed.

  11. [Communicative process in the mobile emergency service (SAMU/192)].

    Science.gov (United States)

    dos Santos, Maria Claudia; Bernardes, Andrea; Gabriel, Carmen Silvia; Evora, Yolanda Dora Martinez; Rocha, Fernanda Ludmilla Rossi

    2012-03-01

    This study aims to characterize the communication process among nursing assistants who work in vehicles of the basic life support of the mobile emergency service, in the coordination of this service, and in the unified medical regulation service in a city of the state of São Paulo, Brazil. This descriptive and qualitative research used the thematic content analysis for data analysis. Semi-structured interviews were used for the data collection, which was held in January, 2010. Results show diffculties in communication with both the medical regulation service and the coordination. Among the most highlighted aspects are failures during the radio transmission, lack of qualified radio operators, difficult access to the coordination and lack of supervision by nurses. However, it was possible to detect solutions that aim to improve the communication ana consequently, the service offered by the mobile emergency service.

  12. 75 FR 44282 - In the Matter of Certain Mobile Telephones and Wireless Communication Devices Featuring Digital...

    Science.gov (United States)

    2010-07-28

    ... From the Federal Register Online via the Government Publishing Office INTERNATIONAL TRADE COMMISSION In the Matter of Certain Mobile Telephones and Wireless Communication Devices Featuring Digital... importation of certain mobile telephones and wireless communication devices featuring digital cameras,...

  13. 78 FR 34132 - Certain Portable Electronic Communications Devices, Including Mobile Phones and Components...

    Science.gov (United States)

    2013-06-06

    ... From the Federal Register Online via the Government Publishing Office INTERNATIONAL TRADE COMMISSION Certain Portable Electronic Communications Devices, Including Mobile Phones and Components Thereof... Communications Devices, Including Mobile Phones and Components Thereof, DN 2958; the Commission...

  14. Cockpit weather graphics using mobile satellite communications

    Science.gov (United States)

    Seth, Shashi

    Many new companies are pushing state-of-the-art technology to bring a revolution in the cockpits of General Aviation (GA) aircraft. The vision, according to Dr. Bruce Holmes - the Assistant Director for Aeronautics at National Aeronautics and Space Administration's (NASA) Langley Research Center, is to provide such an advanced flight control system that the motor and cognitive skills you use to drive a car would be very similar to the ones you would use to fly an airplane. We at ViGYAN, Inc., are currently developing a system called the Pilot Weather Advisor (PWxA), which would be a part of such an advanced technology flight management system. The PWxA provides graphical depictions of weather information in the cockpit of aircraft in near real-time, through the use of broadcast satellite communications. The purpose of this system is to improve the safety and utility of GA aircraft operations. Considerable effort is being extended for research in the design of graphical weather systems, notably the works of Scanlon and Dash. The concept of providing pilots with graphical depictions of weather conditions, overlaid on geographical and navigational maps, is extremely powerful.

  15. 75 FR 32984 - Policy on the Retention of Supporting Documents and the Use of Electronic Mobile Communication...

    Science.gov (United States)

    2010-06-10

    ... Electronic Mobile Communication/Tracking Technology in Assessing Motor Carriers' and Commercial Motor Vehicle... electronic mobile communication/ tracking technology in assessing motor carriers' and commercial motor... (GPS) or other electronic mobile communication/tracking technology during the ordinary course of...

  16. Monitoring Heart Disease and Diabetes with Mobile Internet Communications

    Directory of Open Access Journals (Sweden)

    David Mulvaney

    2012-01-01

    Full Text Available A telemedicine system is described for monitoring vital signs and general health indicators of patients with cardiac and diabetic conditions. Telemetry from wireless sensors and readings from other instruments are combined into a comprehensive set of measured patient parameters. Using a combination of mobile device applications and web browser, the data can be stored, accessed, and displayed using mobile internet communications to the central server. As an extra layer of security in the data transmission, information embedded in the data is used in its verification. The paper highlights features that could be enhanced from previous systems by using alternative components or methods.

  17. Why is CDMA the solution for mobile satellite communication

    Science.gov (United States)

    Gilhousen, Klein S.; Jacobs, Irwin M.; Padovani, Roberto; Weaver, Lindsay A.

    1989-01-01

    It is demonstrated that spread spectrum Code Division Multiple Access (CDMA) systems provide an economically superior solution to satellite mobile communications by increasing the system maximum capacity with respect to single channel per carrier Frequency Division Multiple Access (FDMA) systems. Following the comparative analysis of CDMA and FDMA systems, the design of a model that was developed to test the feasibility of the approach and the performance of a spread spectrum system in a mobile environment. Results of extensive computer simulations as well as laboratory and field tests results are presented.

  18. Close relationships: A study of mobile communication records

    CERN Document Server

    Palchykov, Vasyl; Dunbar, Robin I M; Kaski, Kimmo

    2012-01-01

    Mobile phone communication as a digital service generates ever-increasing datasets of human communication actions, which in turn allow us to investigate the structure and evolution of social interactions and their networks. These datasets can be used to study the structuring of such ego-centric networks with respect to the strength of the relationships by assuming monotonic dependence of the communication intensity on the strength of the social tie. Recently we have discovered that there are significant differences between the first and further 'best friends" from the point of view of age and gender preferences. Here we introduce a control parameter, namely the minimum ratio $r_{min}$ between the intensities of communication of the first and second "best friend" and use it to filter the data. We find that when $r_{min}$ is increased the identification of the "best friend" becomes less ambiguous and the earlier observed effects get stronger, thus corroborating them.

  19. Close Relationships: A Study of Mobile Communication Records

    Science.gov (United States)

    Palchykov, Vasyl; Kertész, János; Dunbar, Robin; Kaski, Kimmo

    2013-05-01

    Mobile phone communication as digital service generates ever-increasing datasets of human communication actions, which in turn allow us to investigate the structure and evolution of social interactions and their networks. These datasets can be used to study the structuring of such egocentric networks with respect to the strength of the relationships by assuming direct dependence of the communication intensity on the strength of the social tie. Recently we have discovered that there are significant differences between the first and further "best friends" from the point of view of age and gender preferences. Here we introduce a control parameter p max based on the statistics of communication with the first and second "best friend" and use it to filter the data. We find that when p max is decreased the identification of the "best friend" becomes less ambiguous and the earlier observed effects get stronger, thus corroborating them.

  20. 77 FR 35336 - Privacy and Security of Information Stored on Mobile Communications Devices

    Science.gov (United States)

    2012-06-13

    ... COMMISSION 47 CFR Part 64 Privacy and Security of Information Stored on Mobile Communications Devices AGENCY... information stored on their users' mobile communications devices. In addition, the document seeks comment on... carriers to secure the privacy of customer information stored in mobile communications devices....

  1. 76 FR 63657 - Certain Devices for Mobile Data Communication; Notice of Institution of Investigation...

    Science.gov (United States)

    2011-10-13

    ... devices for mobile data communication by reason of infringement of certain claims of U.S. Patent No. 6,233... certain devices for mobile data communication that infringe one or more of claims 1, 3, 5- 9, 33-36, and... Mobile Data Communication; Notice of Institution of Investigation; Institution of Investigation...

  2. 75 FR 3914 - Recordation of Trade Name “Sony Ericsson Mobile Communications AB”

    Science.gov (United States)

    2010-01-25

    ... SECURITY U.S. Customs and Border Protection Recordation of Trade Name ``Sony Ericsson Mobile Communications... action. SUMMARY: This document gives notice that ``Sony Ericsson Mobile Communications AB'' has been recorded with CBP as a trade name by Sony Ericsson Mobile Communications AB. The application for trade name...

  3. 77 FR 40083 - Certain Personal Data and Mobile Communications Devices and Related Software; Institution of a...

    Science.gov (United States)

    2012-07-06

    ... COMMISSION Certain Personal Data and Mobile Communications Devices and Related Software; Institution of a... mobile communications devices and related software. 75 FR 17434 (Apr. 6, 2010). The complaint named as..., 2012, third-party T-Mobile USA, Inc. (``T-Mobile'') filed a letter with the Commission arguing that...

  4. NASA's mobile satellite communications program; ground and space segment technologies

    Science.gov (United States)

    Naderi, F.; Weber, W. J.; Knouse, G. H.

    1984-10-01

    This paper describes the Mobile Satellite Communications Program of the United States National Aeronautics and Space Administration (NASA). The program's objectives are to facilitate the deployment of the first generation commercial mobile satellite by the private sector, and to technologically enable future generations by developing advanced and high risk ground and space segment technologies. These technologies are aimed at mitigating severe shortages of spectrum, orbital slot, and spacecraft EIRP which are expected to plague the high capacity mobile satellite systems of the future. After a brief introduction of the concept of mobile satellite systems and their expected evolution, this paper outlines the critical ground and space segment technologies. Next, the Mobile Satellite Experiment (MSAT-X) is described. MSAT-X is the framework through which NASA will develop advanced ground segment technologies. An approach is outlined for the development of conformal vehicle antennas, spectrum and power-efficient speech codecs, and modulation techniques for use in the non-linear faded channels and efficient multiple access schemes. Finally, the paper concludes with a description of the current and planned NASA activities aimed at developing complex large multibeam spacecraft antennas needed for future generation mobile satellite systems.

  5. NASA's mobile satellite communications program; ground and space segment technologies

    Science.gov (United States)

    Naderi, F.; Weber, W. J.; Knouse, G. H.

    1984-01-01

    This paper describes the Mobile Satellite Communications Program of the United States National Aeronautics and Space Administration (NASA). The program's objectives are to facilitate the deployment of the first generation commercial mobile satellite by the private sector, and to technologically enable future generations by developing advanced and high risk ground and space segment technologies. These technologies are aimed at mitigating severe shortages of spectrum, orbital slot, and spacecraft EIRP which are expected to plague the high capacity mobile satellite systems of the future. After a brief introduction of the concept of mobile satellite systems and their expected evolution, this paper outlines the critical ground and space segment technologies. Next, the Mobile Satellite Experiment (MSAT-X) is described. MSAT-X is the framework through which NASA will develop advanced ground segment technologies. An approach is outlined for the development of conformal vehicle antennas, spectrum and power-efficient speech codecs, and modulation techniques for use in the non-linear faded channels and efficient multiple access schemes. Finally, the paper concludes with a description of the current and planned NASA activities aimed at developing complex large multibeam spacecraft antennas needed for future generation mobile satellite systems.

  6. Enable Secure Group Communication in the Mobile Environment

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    This paper considers the key management issue of secure group communication in a highly mobile networking environment. In such environment, there are frequent joining and leaving of members due to roaming or suspending for a period. In order to preserve forward and backward confidentiality, it is necessary to rekey every time a member joins or leaves. This paper introduces a new state-based group key management framework suitable for highly mobile environment. In this scheme, a member enters "Park" state when it is going to roam or suspend for a period, when it becomes active again, it send a request to the key server to get the current group key and changes its state to "Active" again. No rekeying is needed for a roaming, and reliable delivery of rekeying messages is not required for "Park" members. The scheme can notably reduce the communication overhead and provide an efficient method for error recovery.

  7. Modified Binary Exponential Backoff Algorithm to Minimize Mobiles Communication Time

    OpenAIRE

    Ibrahim Sayed Ahmad; Ali Kalakech; Seifedine Kadry

    2014-01-01

    the field of Wireless Local Area Networks (LANs) is expanding rapidly as a result of advances in digital communications, portable computers, and semiconductor technology. The early adopters of this technology have primarily been vertical application that places a premium on the mobility offered by such systems. Binary Exponential Backoff (BEB) refers to a collision resolution mechanism used in random access MAC protocols. This algorithm is used in Ethernet (IEEE 802.3) wired LANs. In Ethe...

  8. Mutual Interference Models for CDMA Mobile Communication Networks

    OpenAIRE

    Hrudkay, K.; Wieser, V.

    2002-01-01

    Nowadays we are witnesses of a huge development one of the most progressive communication technology - mobile networks. The main problem in these networks is an elimination of the mutual interference, which, mainly in non-orthogonal CDMA networks, is the principal obstacle for reaching high transmission rates The aim of this contribution is to give simplified view to mutual interference models for orthogonal and non-orthogonal CDMA networks. The contribution is intended mainly for PhD. studen...

  9. Channel estimation for OFDM in mobile communication systems

    Science.gov (United States)

    Zheng, Kan; Zeng, Guoyan; Wang, Wenbo

    2004-04-01

    Orthogonal Frequency Division Multiplexing (OFDM)is one of the best candidates for the future mobile communication systems. This paper analyzes channel estimation algorithms for OFDM systems not only for the downlink but also for the uplink. With reasonable constraint and well-designed preambles for each user, the DFT-based uplink channel estimation algorithm on the uplink can achieve good estimation accuracy without sacrificing much system capacity. Computer simulation demonstrates effectiveness of channel estimation algorithms and conclusion is followed.

  10. Acoustic Communications and Navigation for Mobile Under-Ice Sensors

    Science.gov (United States)

    2017-02-04

    filled hose with spiral conductors for the through- ice transition where a cable would be vulnerable. The buoy is designed to float after melting out...From- To) 04/02/2017 Final Report 4. TITLE AND SUBTITLE 5a. CONTRACT NUMBER Acoustic Communications and Navigation for Mobile Under- Ice Sensors...Arctic ice . The system consists of ice -tethered sources making GPS-synchronized transmissions and receivers based on the WHOI Micro-Modem that are

  11. First satellite mobile communication trials using BLQS-CDMA

    Science.gov (United States)

    Luzdemateo, Maria; Johns, Simon; Dothey, Michel; Vanhimbeeck, Carl; Deman, Ivan; Wery, Bruno

    1993-01-01

    In this paper, technical results obtained in the first MSBN Land mobile technical trial are reported. MSBN (Mobile Satellite Business Network) is a new program undertaken by the European Space Agency (ESA) to promote mobile satellite communication in Europe, in particular voice capability. The first phase of the MSBN system implementation plan is an experimental phase. Its purpose is to evaluate through field experiments the performance of the MSBN system prior to finalization of its specifications. Particularly, the objective is to verify in the field and possibly improve the performance of the novel satellite access technique BLQS-CDMA (Band Limited Quasi-Synchronous-Code Division Multiple Access), which is proposed as baseline for the MSBN.

  12. Renewable energy (green ICT) support for mobile communications in Africa

    DEFF Research Database (Denmark)

    Tsivor, Kenneth

    2011-01-01

    In the past decade, the telecommunication and Information and Communication Technology (ICT) industry has grown very fast with increasing appetites for modern value added services and gadgets which function without any break, delay or interferences. Currently, total worldwide mobile subscription...... have grown to 5.3 billion and mobile internet subscription to 2 billion at the end of 2010, and these numbers are expected to double within five years (1). The growth trend in Africa is not different. It is expectation that the mobile subscriber base will rise to 1 billion at the end of 2010 (2......, the deployment of renewable energy will provide a reliable and sustainable power supply, in the Telecom/ICT industry thereby making access to ICT much easier and at a lesser cost....

  13. FQPSK techniques for satellite and mobile radio communications systems

    Science.gov (United States)

    Li, Yazhuo; Tang, Jing; Tao, Xiaofeng

    2005-11-01

    A continuous phase modulation (CPM) and constant envelope modulation (CEM) alternative of Feher-Patented quadrature phase-shift keying (FQPSK) modulation technique is presented. It is found to provide good spectral efficiencies, power efficiencies, and bit error rate (BER) performance. The modulation schemes of FQPSK are described. The spectral efficiencies, BER performance are also compared with FQPSK and other modulation techniques which are widely used in current mobile and cordless radio standards. The results show that FQPSK modulated signal exhibits much less spectrum spreading than QPSK, OQPSK, and MSK, and the error probability performance of the FQPSK is superior to those in narrow-band nonlinear channels. Based on that, the system capacity and power dissipation are also analyzed for communication systems. It is found that the encoder or receiver for the FQPSK signal to be fully compatible with original I/Q modulated one. FQPSK technique is suitable for nonlinear channels, such as satellite and mobile communications systems reducing the AM/AM and AM/PM adverse effects. At last it is also attempted to extend the application in 3G (CDMA) and 4G (OFDM) mobile communications systems.

  14. Keetai Meeru: Younger People's Mobile Written Communication in Japan

    Directory of Open Access Journals (Sweden)

    OKUYAMA, Yoshiko

    2009-02-01

    Full Text Available Mobile phone technology is rapidly permeating our everyday lives. In Japan, the mobile phone, or keitai, is considered an absolute necessity for work and personal use. The most frequent users of keitai are Japanese adolescents. This article describes the recent developments and characteristics of keitai meeru (e-mail via mobile phones, a popular form of communication amongst Japanese youth. The data presented here was derived from multiple sources: a survey taken of approximately 900 middle school, high school, and university students in the summer of 2006, interviews with teenage informants, and participant observations collected in 2006 and 2007. The main purpose of this study was to identify changes in the characteristics of keitai meeru reported in previous studies and to provide a more current perspective on school and gender-based differences in Japanese youth cyber communication. The study first highlights the findings of the quantitative data which include some statistically significant school- and gender-based differences in the frequency, purposes, and reasons for keitai meeru communication. The study then summarizes the informants' personal views in contrast to the perspectives of the surveyed adolescents.

  15. Application of Near Field Communication Technology for Mobile Airline Ticketing

    Directory of Open Access Journals (Sweden)

    Wayan Suparta

    2012-01-01

    Full Text Available Problem statement: Near Field Communication (NFC technology opens up exciting new usage scenarios for mobile devices based platform. Users of NFC-enabled devices can simply point or touch their devices to other NFC-enabled elements in the environment to communicate with them (‘contactless’, making application and data usage easy and convenient. Approach: The study describes the characteristics and advantages of NFC technology offers for the development of mobile airline ticketing. This scenario describes the potential to overcome the conventional systems that are not gated and use study tickets. In such a system, today a transport application can be loaded on a NFC-enabled phone. To study such a case, Yogyakarta International Airport was taken as an example for a discussion. Results: NFC technology which consisting of three modes of operation and with international standardization can be applied as contactless to simplicity transactions, content delivery and information sharing on a mobile based platform. Conclusion: The idea of NFC application for mobile airline ticketing has been discussed for Yogyakarta International Airport."

  16. 14 CFR 141.91 - Satellite bases.

    Science.gov (United States)

    2010-01-01

    ... 14 Aeronautics and Space 3 2010-01-01 2010-01-01 false Satellite bases. 141.91 Section 141.91... OTHER CERTIFICATED AGENCIES PILOT SCHOOLS Operating Rules § 141.91 Satellite bases. The holder of a... assistant chief instructor is designated for each satellite base, and that assistant chief instructor...

  17. Proceedings of the Mobile Satellite Conference

    Science.gov (United States)

    Rafferty, William

    1988-01-01

    A satellite-based mobile communications system provides voice and data communications to mobile users over a vast geographic area. The technical and service characteristics of mobile satellite systems (MSSs) are presented and form an in-depth view of the current MSS status at the system and subsystem levels. Major emphasis is placed on developments, current and future, in the following critical MSS technology areas: vehicle antennas, networking, modulation and coding, speech compression, channel characterization, space segment technology and MSS experiments. Also, the mobile satellite communications needs of government agencies are addressed, as is the MSS potential to fulfill them.

  18. History of Antenna Technology for Mobile Communications in Korea

    Science.gov (United States)

    Min, Kyeong-Sik; Park, Chul-Keun; Kang, Suk-Youb

    In this paper, we discuss the development of wireless and mobile communications in Korea, current technological trends, and the future outlook on technological developments. Since the introduction of the telegraph and the telephone in September 1885, Korea's wired and wireless communications industry has consistently developed for over 100 years. Since 1984, upon the provision of the mobile telecommunications service, the industry has seen drastic qualitative and quantitative growth in terms of both technical and economic aspects, which played a crucial role in the rapid growth of the digital industry in Korea. After the era of the analog cellular service based on the Advanced Mobile Phone System (AMPS), a precursor to the modern mobile service, Korea became the world's first country to commercialize Code Division Multiple Access (CDMA) in 1996 and succeeded in commercializing CDMA 2000 lx (IMT 2000) in 2001. With further developments in the mobile communication technology, the technology for antennas also saw drastic advancements. As the mobile antennas moved from the second to the third generation, they grew from external models to very small internal models. At the same time, they evolved into highly functional and high performance multiple band and wide band antennas. Furthermore, Korea was the first country to commercialize and offer the Wireless Broadband Internet (WiBro) service in 2006. By leading the wireless communications standardization and exerting remarkable efforts in research and development, Korea is consolidating its status as an Information Technology (IT) leader in the global market. The antenna's inherent importance will be further emphasized in the near future as it satisfies the performance and structural needs of portable terminals necessary for realizing the projected establishment of the ubiquitous world. It is thought that antenna technologies will not be limited to simple concepts as previously experienced but will utilize various kinds

  19. Observations on Power-Efficiency Trends in Mobile Communication Devices

    Directory of Open Access Journals (Sweden)

    Kari Jyrkkä

    2007-03-01

    Full Text Available Computing solutions used in mobile communications equipment are similar to those in personal and mainframe computers. The key differences between the implementations at chip level are the low leakage silicon technology and lower clock frequency used in mobile devices. The hardware and software architectures, including the operating system principles, are strikingly similar, although the mobile computing systems tend to rely more on hardware accelerators. As the performance expectations of mobile devices are increasing towards the personal computer level and beyond, power efficiency is becoming a major bottleneck. So far, the improvements of the silicon processes in mobile phones have been exploited by software designers to increase functionality and to cut development time, while usage times, and energy efficiency, have been kept at levels that satisfy the customers. Here we explain some of the observed developments and consider means of improving energy efficiency. We show that both processor and software architectures have a big impact on power consumption. Properly targeted research is needed to find the means to explicitly optimize system designs for energy efficiency, rather than maximize the nominal throughputs of the processor cores used.

  20. Observations on Power-Efficiency Trends in Mobile Communication Devices

    Directory of Open Access Journals (Sweden)

    Jyrkkä Kari

    2007-01-01

    Full Text Available Computing solutions used in mobile communications equipment are similar to those in personal and mainframe computers. The key differences between the implementations at chip level are the low leakage silicon technology and lower clock frequency used in mobile devices. The hardware and software architectures, including the operating system principles, are strikingly similar, although the mobile computing systems tend to rely more on hardware accelerators. As the performance expectations of mobile devices are increasing towards the personal computer level and beyond, power efficiency is becoming a major bottleneck. So far, the improvements of the silicon processes in mobile phones have been exploited by software designers to increase functionality and to cut development time, while usage times, and energy efficiency, have been kept at levels that satisfy the customers. Here we explain some of the observed developments and consider means of improving energy efficiency. We show that both processor and software architectures have a big impact on power consumption. Properly targeted research is needed to find the means to explicitly optimize system designs for energy efficiency, rather than maximize the nominal throughputs of the processor cores used.

  1. Aeronautical Mobile Airport Communications System (AeroMACS)

    Science.gov (United States)

    Budinger, James M.; Hall, Edward

    2011-01-01

    To help increase the capacity and efficiency of the nation s airports, a secure wideband wireless communications system is proposed for use on the airport surface. This paper provides an overview of the research and development process for the Aeronautical Mobile Airport Communications System (AeroMACS). AeroMACS is based on a specific commercial profile of the Institute of Electrical and Electronics Engineers (IEEE) 802.16 standard known as Wireless Worldwide Interoperability for Microwave Access or WiMAX (WiMax Forum). The paper includes background on the need for global interoperability in air/ground data communications, describes potential AeroMACS applications, addresses allocated frequency spectrum constraints, summarizes the international standardization process, and provides findings and recommendations from the world s first AeroMACS prototype implemented in Cleveland, Ohio, USA.

  2. Permutation based speech scrambling for next generation mobile communication

    Directory of Open Access Journals (Sweden)

    Dhanya G

    2016-04-01

    Full Text Available Scrambling is a really significant method that provides protection in communication systems by using random permutation and pseudorandom binary scrambling method. To enhance the security in communication, OFDM scrambling can provide better protection than an FFT scrambler under same permutation operation. To evaluate the quality of the proposed system, perceptual evaluation of speech quality is used. The objective test SNR and BER are used to estimate the noise performance of the system. STI and CIS were applied to know the performance of the system. From the simulations, it is clear that, the proposed system shows better performance than conventional scrambling technique and it is more robust in the 4th generation of mobile communication.

  3. Channel-Specific Daily Patterns in Mobile Phone Communication

    CERN Document Server

    Aledavood, Talayeh; Roberts, Sam G B; Reed-Tsochas, Felix; Moro, Esteban; Dunbar, Robin I M; Saramäki, Jari

    2015-01-01

    Humans follow circadian rhythms, visible in their activity levels as well as physiological and psychological factors. Such rhythms are also visible in electronic communication records, where the aggregated activity levels of e.g. mobile telephone calls or Wikipedia edits are known to follow their own daily patterns. Here, we study the daily communication patterns of 24 individuals over 18 months, and show that each individual has a different, persistent communication pattern. These patterns may differ for calls and text messages, which points towards calls and texts serving a different role in communication. For both calls and texts, evenings play a special role. There are also differences in the daily patterns of males and females both for calls and texts, both in how they communicate with individuals of the same gender vs. opposite gender, and also in how communication is allocated at social ties of different nature (kin ties vs. non-kin ties). Taken together, our results show that there is an unexpected ri...

  4. Sports video summarization and adaptation for application in mobile communication

    Institute of Scientific and Technical Information of China (English)

    GAO Wen; HUANG Qing-ming; JIANG Shu-qiang; ZHANG Peng

    2006-01-01

    Sports video appeals to large audiences due to its high commercial potentials. Automatically extracting useful semantic information and generating highlight summary from sports video to facilitate users' accessing requirements is an important problem, especially in the forthcoming broadband mobile communication and the need for users to access their multimedia information of interest from anywhere at anytime with their most convenient digital equipments. In this paper, a system to generate highlight summaries oriented for mobile applications is introduced, which includes highlight extraction and video adaptation. In this system, several highlight extraction techniques are provided for field sports video and racket sports video by using multi-modal information. To enhance users' viewing experience and save bandwidth, 3D animation from highlight segment is also generated. As an important procedure to make video analysis results universally applicable, video transcoding techniques are applied to adapt the video for mobile communication environment and user preference. Experimental results are encouraging and show the advantage and feasibility of the system for multimedia content personalization, enhancement and adaptation to meet different user preference and network/device requirements.

  5. Mobile communication jacket for people with severe speech impairment.

    Science.gov (United States)

    Lampe, Renée; Blumenstein, Tobias; Turova, Varvara; Alves-Pinto, Ana

    2017-04-27

    Cerebral palsy is a movement disorder caused by damage to motor control areas of the developing brain during early childhood. Motor disorders can also affect the ability to produce clear speech and to communicate. The aim of this study was to develop and to test a prototype of an assistive tool with an embedded mobile communication device to support patients with severe speech impairments. A prototype was developed by equipping a cycling jacket with a display, a small keyboard, a LED and an alarm system, all controlled by a microcontroller. Functionality of the prototype was tested in six participants (aged 7-20 years) with cerebral palsy and global developmental disorder and three healthy persons. A patient questionnaire consisting of seven items was used as an evaluation tool. A working prototype of the communication jacket was developed and tested. The questionnaire elicited positive responses from participants. Improvements to correct revealed weaknesses were proposed. Enhancements like voice output of pre-selected phrases and enlarged display were implemented. Integration in a jacket makes the system mobile and continuously available to the user. The communication jacket may be of great benefit to patients with motor and speech impairments. Implications for Rehabilitation The communication jacket developed can be easily used by people with movement and speech impairment. All technical components are integrated in a garment and do not have to be held with the hands or transported separately. The system is adaptable to individual use. Both expected and unexpected events can be dealt with, which contributes to the quality of life and self-fulfilment.

  6. Interference Analysis for an Aeronautical Mobile Airport Communications System

    Science.gov (United States)

    Wilson, Jeffrey D.; Kercewski, Robert J.

    2010-01-01

    The next generation of aeronautical communications for airport surface applications has been identified through a NASA research program and an international collaborative future communications study. The result, endorsed by both the United States and European regulatory agencies is called AeroMACS (Aeronautical Mobile Airport Communications System) and is based upon the IEEE 802.16e mobile wireless standard. Coordinated efforts to develop appropriate aviation standards for the AeroMACS system are now underway within RTCA (United States) and Eurocae (Europe). AeroMACS will be implemented in a recently allocated frequency band, 5091- 5150 MHz. As this band is also occupied by fixed satellite service uplinks, AeroMACS must be designed to avoid interference with this incumbent service. The aspects of AeroMACS operation that present potential interference to the fixed satellite service are under analysis in order to enable the definition of standards that assure that such interference will be avoided. The NASA Glenn Research Center has been involved in this analysis, and the first results of modeling and simulation efforts directed at this analysis are the subject of this paper.12

  7. Energy and environmental aspects of mobile communication systems

    CERN Document Server

    Lubritto, C; Vetromile, C; Curcuruto, S; Logorelli, M; Marsico, G; D'Onofrio, A; 10.1016/j.energy.2010.11.039

    2011-01-01

    The reduction of the energy consumptions of a Telecommunication Power System represents one of the critical factors of the telecommunication technologies, both to allow a sizeable saving of economic resources and to realize "sustainable" development actions. The consumption of about one hundred base stations for mobile phones were monitored for a total of over one thousand days, in order to study the energy consumption in relation to the environmental, electric and logistics parameters of the stations themselves. It was possible to survey, then, the role of the mobile communication systems in the general national energy framework and to plot the best areas of intervention for saving energy and improving the environmental impact, showing the role played by air conditioning and transmission equipments. Finally, new transmission algorithms and the use of renewable energy based techniques have been tested.

  8. Mutual Interference Models for CDMA Mobile Communication Networks

    Directory of Open Access Journals (Sweden)

    K. Hrudkay

    2002-12-01

    Full Text Available Nowadays we are witnesses of a huge development one of the mostprogressive communication technology - mobile networks. The mainproblem in these networks is an elimination of the mutual interference,which, mainly in non-orthogonal CDMA networks, is the principalobstacle for reaching high transmission rates The aim of thiscontribution is to give simplified view to mutual interference modelsfor orthogonal and non-orthogonal CDMA networks. The contribution isintended mainly for PhD. students to help them to obtain an orientationin such a complicated areas, as the interference models for CDMAnetworks are.

  9. The distribution of communication cost for a mobile service scenario

    DEFF Research Database (Denmark)

    Møller, Jesper; Yiu, Man Lung

    We consider the following mathematical model for a mobile service scenario. Consider a planar stationary Poisson process, with its points radially ordered with respect to the origin (the anchor); these points may correspond to locations of e.g. restaurants. A user, with a location different from ......, is analysed in detail. In particular the expected communication cost and the asymptotic behaviour as the distance between the user and the anchor increases are of interest....... the origin, asks for the location of the first Poisson point and keeps asking for the location of the next Poisson point until the first time that he can be completely certain that he knows which Poisson point is his nearest neighbour. The distribution of this waiting time, called the communication cost...

  10. 76 FR 41523 - In the Matter of Certain Mobile Communications and Computer Devices and Components Thereof...

    Science.gov (United States)

    2011-07-14

    ... COMMISSION In the Matter of Certain Mobile Communications and Computer Devices and Components Thereof; Notice...-TA-704, Certain Mobile Communications and Computer Devices and Components Thereof based on a... communications and computer devices and components thereof by reason of infringement of certain claims of...

  11. Design for Social Presence and Exploring Its Mediating Effect in Mobile Data Communication Services

    Science.gov (United States)

    Ogara, Solomon Omondi

    2011-01-01

    The mobility, flexibility, convenience, and ubiquity of mobile data services (MDS) have contributed to their enormous growth and popularity with users. MDS allow users to communicate through mobile texting (mTexting), mobile Instant Messaging (mIM), multimedia messaging services (MMS), and email. A unique feature of MDS that enhances its…

  12. Modified Binary Exponential Backoff Algorithm to Minimize Mobiles Communication Time

    Directory of Open Access Journals (Sweden)

    Ibrahim Sayed Ahmad

    2014-02-01

    Full Text Available the field of Wireless Local Area Networks (LANs is expanding rapidly as a result of advances in digital communications, portable computers, and semiconductor technology. The early adopters of this technology have primarily been vertical application that places a premium on the mobility offered by such systems. Binary Exponential Backoff (BEB refers to a collision resolution mechanism used in random access MAC protocols. This algorithm is used in Ethernet (IEEE 802.3 wired LANs. In Ethernet networks, this algorithm is commonly used to schedule retransmissions after collisions. The paper’s goal is to minimize the time transmission cycle of the information between mobiles moving in a Wi-Fi by changing the BEB algorithm. The Protocol CSMA / CA manage access to the radio channel by performing an arbitration based on time. This causes many problems in relation to time transmission between mobiles moving in a cell 802.11. what we have done show that the protocol using CSMA / CA access time believed rapidly when the number of stations and / or the network load increases or other circumstances affects the network.

  13. LOW ALTITUDE AIRSHIPS FOR SEAMLESS MOBILE COMMUNICATION IN AIR TRAVEL

    Directory of Open Access Journals (Sweden)

    Madhu D

    2014-11-01

    Full Text Available The Aviation Administration policy prohibits the use of mobile phones in Aircraft during transition for the reason it may harm their communication system due to Electromagnetic interference. In case the user wants to access cellular network at higher altitudes, base station access is a problem. Large number of channels are allocated to a single user moving at high speed by various Base Stations in the vicinity to service the request requiring more resources. Low Altitude Platforms (LAPs are provided in the form of Base stations in the Airships with antennas projected upwards which has direct link with the Ground Station. LAPs using LongEndurance Multi-Intelligence Vehicle (LEMVs equipped with an engine for mobility and stable positioning against rough winds are utilized. This paper proposes a system that allows the passengers to use their mobiles in Aircraft using LAPs as an intermediate system between Aircraft and Ground station. As the Aircraft is dynamic, it has to change its link frequently with the Airships, MANETs using AODV protocol is established in the prototype using NS2 to provide the service and the results are encouraging

  14. 3GPP SA2 architecture and functions for 5G mobile communication system

    OpenAIRE

    Junseok Kim; Dongmyoung Kim; Sunghyun Choi

    2017-01-01

    The on-going development of Fifth Generation (5G) mobile communication technology will be the cornerstone for applying Information and Communication Technology (ICT) to various fields, e.g., smart city, smart home, connected car, etc. The 3rd Generation Partnership Project (3GPP), which has developed the most successful standard technologies in the mobile communication market such as Universal Mobile Telecommunication System (UMTS) and Long Term Evolution (LTE), is currently carrying out the ...

  15. Validation of an Innovative Satellite-Based UV Dosimeter

    Science.gov (United States)

    Morelli, Marco; Masini, Andrea; Simeone, Emilio; Khazova, Marina

    2016-08-01

    We present an innovative satellite-based UV (ultraviolet) radiation dosimeter with a mobile app interface that has been validated by exploiting both ground-based measurements and an in-vivo assessment of the erythemal effects on some volunteers having a controlled exposure to solar radiation.Both validations showed that the satellite-based UV dosimeter has a good accuracy and reliability needed for health-related applications.The app with this satellite-based UV dosimeter also includes other related functionalities such as the provision of safe sun exposure time updated in real-time and end exposure visual/sound alert. This app will be launched on the global market by siHealth Ltd in May 2016 under the name of "HappySun" and available both for Android and for iOS devices (more info on http://www.happysun.co.uk).Extensive R&D activities are on-going for further improvement of the satellite-based UV dosimeter's accuracy.

  16. Mobile phone messaging for communicating results of medical investigations.

    Science.gov (United States)

    Gurol-Urganci, Ipek; de Jongh, Thyra; Vodopivec-Jamsek, Vlasta; Car, Josip; Atun, Rifat

    2012-06-13

    Mobile phone messaging, such as Short Message Service (SMS) and Multimedia Message Service (MMS), has rapidly grown into a mode of communication with a wide range of applications, including communicating the results from medical investigations to patients. Alternative modes of communication of results include face-to-face communication, postal messages, calls to landlines or mobile phones, through web-based health records and email. Possible advantages of mobile phone messaging include convenience to both patients and healthcare providers, reduced waiting times for health services and healthcare costs. To assess the effects of mobile phone messaging for communicating results of medical investigations, on people's healthcare-seeking behaviour and health outcomes. Secondary objectives include assessment of participants' evaluation of the intervention, direct and indirect healthcare costs and possible risks and harms associated with the intervention. We searched the Cochrane Central Register of Controlled Trials (CENTRAL, The Cochrane Library 2009, Issue 2), MEDLINE (OvidSP) (January 1993 to June 2009), EMBASE (OvidSP) (January 1993 to June 2009), PsycINFO (OvidSP) (January 1993 to June 2009), CINAHL (EbscoHOST) (January 1993 to June 2009), LILACS (January 1993 to June 2009) and African Health Anthology (January 1993 to June 2009). We also reviewed grey literature (including trial registers) and reference lists of articles. We included randomised controlled trials (RCTs), quasi-randomised controlled trials (QRCTs), controlled before-after (CBA) studies, or interrupted time series (ITS) studies with at least three time points before and after the intervention. We included studies assessing mobile phone messaging for communicating results of medical tests, between a healthcare provider or 'treatment buddy' and patient. We only included studies in which it was possible to assess the effects of mobile phone messaging independent of other technologies or interventions.

  17. Space Mobile Network: A Near Earth Communications and Navigation Architecture

    Science.gov (United States)

    Israel, David J.; Heckler, Gregory W.; Menrad, Robert J.

    2016-01-01

    This paper shares key findings of NASA's Earth Regime Network Evolution Study (ERNESt) team resulting from its 18-month effort to define a wholly new architecture-level paradigm for the exploitation of space by civil space and commercial sector organizations. Since the launch of Sputnik in October 1957 spaceflight missions have remained highly scripted activities from launch through disposal. The utilization of computer technology has enabled dramatic increases in mission complexity; but, the underlying premise that the diverse actions necessary to meet mission goals requires minute-by-minute scripting, defined weeks in advance of execution, for the life of the mission has remained. This archetype was appropriate for a "new frontier" but now risks overtly constraining the potential market-based opportunities for the innovation considered necessary to efficiently address the complexities associated with meeting communications and navigation requirements projected to be characteristics of the next era of space exploration: a growing number of missions in simultaneous execution, increased variance of mission types and growth in location/orbital regime diversity. The resulting ERNESt architectural cornerstone - the Space Mobile Network (SMN) - was envisioned as critical to creating an environment essential to meeting these future challenges in political, programmatic, technological and budgetary terms. The SMN incorporates technologies such as: Disruption Tolerant Networking (DTN) and optical communications, as well as new operations concepts such as User Initiated Services (UIS) to provide user services analogous to today's terrestrial mobile network user. Results developed in collaboration with NASA's Space Communications and Navigation (SCaN) Division and field centers are reported on. Findings have been validated via briefings to external focus groups and initial ground-based demonstrations. The SMN opens new niches for exploitation by the marketplace of mission

  18. Minimizing Mobiles Communication Time Using Modified Binary Exponential Backoff Algorithm

    Directory of Open Access Journals (Sweden)

    Ibrahim Sayed Ahmad

    2013-11-01

    Full Text Available The domain of wireless Local Area Networks (WLANsis growing speedily as a consequence ofdevelopments in digital communications technology.The early adopters of this technology have mainlybeen vertical applicationthat places a premium on the mobility offered by such systems. Examples of thesetypes of applications consist of stocking control in depot environments,point of sale terminals, and rentalcar check-in. Furthermore to the mobility thatbecomes possible with wireless LANs; these systemshavealso been used in environments where cable installation is expensive or impractical. Such environmentsincludemanufacturingfloors, tradingfloors on stock exchanges, conventions and trade shows,and historicbuildings. With the increasing propagation of wireless LANs comes theneed for standardization so as toallow interoperability for an increasingly mobileworkforce. Despite all the advantages and facilities thatWi-FI offers, there is still the delay problem thatis due to many reasons that are introduced in details inour case study which also presents the solutions and simulation that can reduce this delay for betterperformance of the wireless networks.Binary Exponential Backoff (BEB refers to a collision resolution mechanism used in random access MACprotocols. This algorithm is used in Ethernet (IEEE802.3 wired LANs. In Ethernet networks, thisalgorithm is commonly used to schedule retransmissions after collisions.The paper’s goal is to minimize the time transmission cycle of the information between mobiles movingin aWi-Fi by changing the BEB algorithm. The Protocol CSMA / CA manage access to the radio channel byperforming an arbitration based on time. This causes many problems in relation to time transmissionbetween mobiles moving in a cell 802.11. what we have done show that the protocol using CSMA / CAaccess time believed rapidly when the number of stations and / or the network load increases or othercircumstances affects the network.

  19. 75 FR 65654 - In the Matter of: Certain Mobile Telephones and Wireless Communication Devices Featuring Digital...

    Science.gov (United States)

    2010-10-26

    ... From the Federal Register Online via the Government Publishing Office ] INTERNATIONAL TRADE COMMISSION In the Matter of: Certain Mobile Telephones and Wireless Communication Devices Featuring Digital... and wireless communication devices featuring digital cameras, and components thereof, that...

  20. Mobilization as Communication : A Latin American contribution to the study of social movements

    OpenAIRE

    Sartoretto, Paola

    2016-01-01

    Many scholars have noted the lack of interdisciplinary dialogue and research between the areas of social movements studies and that of media and communications. While social movement studies fail to fully analyse media practices and communicative processes in relation to mobilization, in media and communication the social and political aspects of mobilization are seldom taken into account when analysing communication in social movements. This apparent lack of dialogue is presented in the pape...

  1. A mobile phone-based Communication Support System for elderly persons.

    Science.gov (United States)

    Ogawa, Hidekuni; Yonezawa, Yoshiharu; Maki, Hiromichi; Caldwell, W Morton

    2007-01-01

    A mobile phone-based communication support system has been developed for assisting elderly people to communicate by mobile phone. The system consists of a low power mobile phone (PHS phone) having a large liquid crystal screen. When an elderly person telephones, they then choose a communication person from registered support personnel pictures displayed on the liquid crystal screen. The PHS phone dials that person automatically. The elderly person can therefore easily recognize and verify the person. The newly-developed communication support system assists a significant percentage of elderly people with poor eyesight and memory, which frequently cause communication problems, such as dialing a wrong number.

  2. Considerations of digital phase modulation for narrowband satellite mobile communication

    Science.gov (United States)

    Grythe, Knut

    1990-01-01

    The Inmarsat-M system for mobile satellite communication is specified as a frequency division multiple access (FDMA) system, applying Offset Quadrature Phase Shift Keying (QPSK) for transmitting 8 kbit/sec in 10 kHz user channel bandwidth. We consider Digital Phase Modulation (DPM) as an alternative modulation format for INMARSAT-M. DPM is similar to Continuous Phase Modulation (CPM) except that DPM has a finite memory in the premodular filter with a continuous varying modulation index. It is shown that DPM with 64 states in the VA obtains a lower bit error rate (BER). Results for a 5 kHz system, with the same 8 kbit/sec transmitted bitstream, is also presented.

  3. Leveraging Bus Mobility to Enable Communications in Urban Areas

    CERN Document Server

    Gaito, Sabrina; Rossi, Gian Paolo

    2011-01-01

    This paper shows that the deployment of an opportunistic network on any public transportation system leads to obtain a scalable and efficient urban communication platform. We use the term Bus Switched Networks (BSNs) to indicate this urban backbone that complements the services of 3G networks and enables to meet the application level requirements for a large class of applications by ensuring high delivery ratio and acceptable delays under different conditions of packet load. We sustain these arguments by providing three contributions. The first contribution is a novel and lightweight probabilistic routing protocol for BSN which we prove to be highly effective in satisfying the loose QoS required by urban-wide delay-tolerant information services. The second contribution is the proposal of URBeS, an analysis platform that, given a specific city served by public transportation, produces real bus mobility traces and traffic analysis for any given routing protocol. The last contribution is an extensive benchmark a...

  4. Wireless Communication Enhancement Methods for Mobile Robots in Radiation Environments

    CERN Document Server

    Nattanmai Parasuraman, Ramviyas; Ferre, Manuel

    In hostile environments such as in scientific facilities where ionising radiation is a dominant hazard, reducing human interventions by increasing robotic operations are desirable. CERN, the European Organization for Nuclear Research, has around 50 km of underground scientific facilities, where wireless mobile robots could help in the operation of the accelerator complex, e.g. in conducting remote inspections and radiation surveys in different areas. The main challenges to be considered here are not only that the robots should be able to go over long distances and operate for relatively long periods, but also the underground tunnel environment, the possible presence of electromagnetic fields, radiation effects, and the fact that the robots shall in no way interrupt the operation of the accelerators. Having a reliable and robust wireless communication system is essential for successful execution of such robotic missions and to avoid situations of manual recovery of the robots in the event that the robot runs ...

  5. A fast motion estimation algorithm for mobile communications

    Institute of Scientific and Technical Information of China (English)

    CHEN Guo-bin

    2006-01-01

    The limitation of processing power, battery life and memory capacity of portable terminals requires reducing encoding complexity in mobile communications. Motion estimation (ME) is the most computationally intensive module in a typical video codec, which determines not only the encoder's performance but also the reconstructed video quality. In this paper, a fast ME algorithm for H.264/AVC baseline profile coding is proposed based on the analysis of motion vector field and error surface, and the statistical distributions of different type macroblocks (MBs). Simulation results showed that: in comparison with MVFAST,the proposed algorithm can decrease the computational load over 7.2% with no requirement of expanding memory capacity while maintaining the same video quality as MVFAST. Furthermore, its simplicity makes it easy to be implemented on hardware.

  6. Isolated and coupled superquadric loop antennas for mobile communications applications

    Science.gov (United States)

    Jensen, Michael A.; Rahmat-Samii, Yahya

    1993-01-01

    This work provides an investigation of the performance of loop antennas for use in mobile communications applications. The analysis tools developed allow for high flexibility by representing the loop antenna as a superquadric curve, which includes the case of circular, elliptical, and rectangular loops. The antenna may be in an isolated environment, located above an infinite ground plane, or placed near a finite conducting plate or box. In cases where coupled loops are used, the two loops may have arbitrary relative positions and orientations. Several design examples are included to illustrate the versatility of the analysis capabilities. The performance of coupled loops arranged in a diversity scheme is also evaluated, and it is found that high diversity gain can be achieved even when the antennas are closely spaced.

  7. Renewable energy (green ICT) support for mobile communications in Africa

    DEFF Research Database (Denmark)

    Tsivor, Kenneth

    2011-01-01

    In the past decade, the telecommunication and Information and Communication Technology (ICT) industry has grown very fast with increasing appetites for modern value added services and gadgets which function without any break, delay or interferences. Currently, total worldwide mobile subscription......). This growth therefore requires more reliable and sustainable energy for effective operation. However, about nearly 1.6 billion people in the world do not have access to electricity and about 99 percent of this figure is from developing countries. This shows that about 1.3 billion people from Sub......-Saharan African do not have access to the grid electricity (3). This paper looks at energy consumption of telecommunication and ICT in African countries, the potentials of introducing renewable energy into telecommunication and ICT sector in Africa especially in the rural communities. It is expected that...

  8. Global System for Mobile Communication Based Smart Home Security System

    Directory of Open Access Journals (Sweden)

    Amrit Zoad

    2014-07-01

    Full Text Available Home security system is needed for occupants' convenience and safety. In this paper, we present the design and implementation of an affordable, low power consumption, and GSM (Global System for Mobile Communication based wireless home security system. In existing system, the home network is engaged with non-wireless technology, where the installation and maintenance is difficult. So the system cost is very high. In our proposed system, these difficulties are overcome by introducing a wireless home network which contains a GPRS Gateway and three kinds of security nodes namely door security node, anti intrusion node and SMS node to inform the user. The nodes are easy installing. All the three nodes are connected to the microcontroller.

  9. Adaptive beamforming in a CDMA mobile satellite communications system

    Science.gov (United States)

    Munoz-Garcia, Samuel G.

    1993-01-01

    Code-Division Multiple-Access (CDMA) stands out as a strong contender for the choice of multiple access scheme in these future mobile communication systems. This is due to a variety of reasons such as the excellent performance in multipath environments, high scope for frequency reuse and graceful degradation near saturation. However, the capacity of CDMA is limited by the self-interference between the transmissions of the different users in the network. Moreover, the disparity between the received power levels gives rise to the near-far problem, this is, weak signals are severely degraded by the transmissions from other users. In this paper, the use of time-reference adaptive digital beamforming on board the satellite is proposed as a means to overcome the problems associated with CDMA. This technique enables a high number of independently steered beams to be generated from a single phased array antenna, which automatically track the desired user signal and null the unwanted interference sources. Since CDMA is interference limited, the interference protection provided by the antenna converts directly and linearly into an increase in capacity. Furthermore, the proposed concept allows the near-far effect to be mitigated without requiring a tight coordination of the users in terms of power control. A payload architecture will be presented that illustrates the practical implementation of this concept. This digital payload architecture shows that with the advent of high performance CMOS digital processing, the on-board implementation of complex DSP techniques -in particular digital beamforming- has become possible, being most attractive for Mobile Satellite Communications.

  10. Mobile health-monitoring system through visible light communication.

    Science.gov (United States)

    Tan, Yee-Yong; Chung, Wan-Young

    2014-01-01

    Promising development in the light emitting diode (LED) technology has spurred the interest to adapt LED for both illumination and data transmission. This has fostered the growth of interest in visible light communication (VLC), with on-going research to utilize VLC in various applications. This paper presents a mobile-health monitoring system, where healthcare information such as biomedical signals and patient information are transmitted via the LED lighting. A small and portable receiver module is designed and developed to be attached to the mobile device, providing a seamless monitoring environment. Three different healthcare information including ECG, PPG signals and HL7 text information is transmitted simultaneously, using a single channel VLC. This allows for a more precise and accurate monitoring and diagnosis. The data packet size is carefully designed, to transmit information in a minimal packet error rate. A comprehensive monitoring application is designed and developed through the use of a tablet computer in our study. Monitoring and evaluation such as heart rate and arterial blood pressure measurement can be performed concurrently. Real-time monitoring is demonstrated through experiment, where non-hazardous transmission method can be implemented alongside a portable device for better and safer healthcare service.

  11. Challenges of Future R&D in Mobile Communications

    Directory of Open Access Journals (Sweden)

    Dr. Anwar M. Mousa

    2012-09-01

    Full Text Available This paper provides a survey for the main challenges of future research and development (R&D for next generation mobile networks (NGNs. It addresses software and hardware re-configurability with focus on reconfigurable coupling and interworking amongst heterogeneous wireless access networks. It also explores the promising technologies for NGNs such as nanotechnology, cloud computing and texting by thinking. The paper then highlights the challenging research areas for enhancing network performance and affordability beginning with All IP network and security issues, Vehicular Ad Hoc Networks (VANET and the necessity of high data rates at cell edges. Investigating the viability of cooperative networks and one unified global standard for NGNs, the paper analyzes macro-diversity and advanced multi-cell coordination for mitigating inter-cell interference. Direct device-to-device communication, global coverage using satellites and high-altitude platforms are presented as possible evolution paths for space roaming and extending NGN’ radio-access. Finally, the paper inspects the most developing applications for NGNs such as World-Wide Wireless Web (WWWW, machine-type communication, wireless sensor networks (WSNs, e-healthcare systems and wearable devices with AI capabilities.

  12. 76 FR 17965 - In the Matter of Certain Mobile Telephones and Wireless Communication Devices Featuring Digital...

    Science.gov (United States)

    2011-03-31

    ... COMMISSION In the Matter of Certain Mobile Telephones and Wireless Communication Devices Featuring Digital... States after importation of certain mobile telephones and wireless communication devices featuring digital cameras, and components thereof, that infringe certain claims of U.S. Patent No. 6,292,218...

  13. 75 FR 6704 - In the Matter of Certain Mobile Telephones and Wireless Communication Devices Featuring Digital...

    Science.gov (United States)

    2010-02-10

    ... COMMISSION In the Matter of Certain Mobile Telephones and Wireless Communication Devices Featuring Digital... within the United States after importation of certain mobile telephones and wireless communication devices featuring digital cameras and components thereof that infringe certain claims of U.S. Patent...

  14. 77 FR 43858 - Certain Mobile Telephones and Wireless Communication Devices Featuring Digital Cameras, and...

    Science.gov (United States)

    2012-07-26

    ... COMMISSION Certain Mobile Telephones and Wireless Communication Devices Featuring Digital Cameras, and... States after importation of certain mobile telephones and wireless communication devices featuring digital cameras, and components thereof, that infringe certain claims of U.S. Patent No. 6,292,218...

  15. 77 FR 69501 - Certain Devices for Mobile Data Communication; Determination Not To Review an Initial...

    Science.gov (United States)

    2012-11-19

    ... COMMISSION Certain Devices for Mobile Data Communication; Determination Not To Review an Initial..., and the sale within the United States after importation of certain devices for mobile data communication by reason of infringement of certain claims of United States Patent Nos. 6,233,608; 6,289,212;...

  16. 77 FR 60721 - Certain Devices for Mobile Data Communication; Notice of Commission Determination Not To Review...

    Science.gov (United States)

    2012-10-04

    ... From the Federal Register Online via the Government Publishing Office INTERNATIONAL TRADE COMMISSION Certain Devices for Mobile Data Communication; Notice of Commission Determination Not To Review an... importation of certain devices for mobile data communication by reason of infringement of various claims...

  17. 75 FR 8399 - In the Matter of Certain Mobile Communications and Computer Devices and Components Thereof...

    Science.gov (United States)

    2010-02-24

    ... COMMISSION In the Matter of Certain Mobile Communications and Computer Devices and Components Thereof; Notice... after importation of certain mobile communications or computer devices or components thereof that... U.S.C. 1337, on behalf of Apple Inc., f/k/a Apple Computer, Inc. of Cupertino, California....

  18. Land mobile satellite communication system. Volume 2: Traffic analysis and market demand for the land mobile communications system in the European scenario

    Science.gov (United States)

    Carnebianca, C.; Pavesi, B.; Tuozzi, A.; Capone, R.

    1986-06-01

    The socioeconomic desirability in terms of market demand, technical economic feasibility, and price-performance for a Land Mobile Communication system ground based and/or satellite aided, able to satisfy the request of the traffic demand, foreseable in the 1995-2005 time frame, for the Western European countries was assessed. The criterion of economic value of the mobile system is considered as the driving element. The presence of gaps in the terrestrial system and reasonable traffic extrapolations suggest a very attractive role for a land mobile satellite communications mission.

  19. Social psychological determinants of mobile communication technology use and adoption : a comparison of three models to explain and predict mobile communication technology behavior

    NARCIS (Netherlands)

    Peters, Oscar

    2007-01-01

    This dissertation focuses on the social psychological determinants of mobile communication technology use and adoption in an attempt to better understand people’s behavior for adopting and using innovative information and communication technologies. In particular, this study emphasizes the compariso

  20. Research on DTX Technology and Power Consumption Performance of Mobile Communication Terminal

    Directory of Open Access Journals (Sweden)

    Xie Shui Zhen

    2016-01-01

    Full Text Available In order to reduce the power consumption of GSM and TD-SCDMA mobile communication system terminal, the paper starts with DTX (Discontinuous Transmission technology of GSM and TD-SCDMA systems, offers a detailed analysis of the DTX’s function in optimizing power consumption of GSM and TDSCDMA mobile communication system terminal and reducing system interference, and verifies DTX’s positive role in reducing the power consumption of the mobile terminal by experiment.

  1. Adaptive digital beamforming for a CDMA mobile communications payload

    Science.gov (United States)

    Munoz-Garcia, Samuel G.; Ruiz, Javier Benedicto

    1993-01-01

    In recent years, Spread-Spectrum Code Division Multiple Access (CDMA) has become a very popular access scheme for mobile communications due to a variety of reasons: excellent performance in multipath environments, high scope for frequency reuse, graceful degradation near saturation, etc. In this way, a CDMA system can support simultaneous digital communication among a large community of relatively uncoordinated users sharing a given frequency band. Nevertheless, there are also important problems associated with the use of CDMA. First, in a conventional CDMA scheme, the signature sequences of asynchronous users are not orthogonal and, as the number of active users increases, the self-noise generated by the mutual interference between users considerably degrades the performance, particularly in the return link. Furthermore, when there is a large disparity in received powers - due to differences in slant range or atmospheric attenuation - the non-zero cross-correlation between the signals gives rise to the so-called near-far problem. This leads to an inefficient utilization of the satellite resources and, consequently, to a drastic reduction in capacity. Several techniques were proposed to overcome this problem, such as Synchronized CDMA - in which the signature sequences of the different users are quasi-orthogonal - and power control. At the expense of increased network complexity and user coordination, these techniques enable the system capacity to be restored by equitably sharing the satellite resources among the users. An alternative solution is presented based upon the use of time-reference adaptive digital beamforming on board the satellite. This technique enables a high number of independently steered beams to be generated from a single phased array antenna, which automatically track the desired user signal and null the unwanted interference source. In order to use a time-reference adaptive antenna in a communications system, the main challenge is to obtain a

  2. Perspectives of a mobile application for people with communication disabilities in the community.

    Science.gov (United States)

    Crook, Alice; Kenny, Julie; Johnson, Hilary; Davidson, Bronwyn

    2017-02-01

    Purpose To determine the perceptions of people with complex communication needs (CCN) and business staff regarding the uses and functionality of a mobile application to aid communication access. Method A qualitative study using thematic analysis of transcripts and field notes from focus groups and interviews of 19 people with CCN and nine business staff. Results Four themes and 10 subthemes were drawn from the data. Themes highlighted the desire for: increased communication strategies to support customer interactions, increased access to information, functionality of a mobile application to increase its utility, and preferred technical and visual features of mobile applications. Conclusion People with CCN and business staff perceived a mobile application as a useful tool to aid communication access. This research highlighted the importance of facilitating strategies to communicative interactions and information in the community as the fundamental goal of a mobile application developed to support communication access. Implications for Rehabilitation Mobile applications are widely accepted and used in modern customer service industries and have been identified as tools to increase communication access for people with complex communication needs (CCN). People with CCN identified accessibility, presentation, and customisation as important features of mobile applications for communication access. The diversity of user preferences and needs, and the rapid development of new technologies limit the applicability of a single design for mobile applications for people with CCN. People with CCN should be involved in application design and development. A mobile application for communication access would support customer-business interactions as well as enable more accessible information sharing about disability needs and services.

  3. A Uniform Publish-Subscribe Infrastructure for Communication in Wireless Mobile Environments

    DEFF Research Database (Denmark)

    Brønsted, Jeppe; Hansen, Klaus Marius; Thorup, Rolf

    2006-01-01

    systems and therefore it is important to have communication middleware that hides the complexity of low level network programming and presents a clean and understandable abstraction over communication to the application programmer. It has previously been shown that the publish-subscribe messaging paradigm......In near future the transportation sector will be communication enabled. Devices in vehicles will be able to communicate and thus make a new range of services possible. However, heterogeneous communication capabilities and vehicle mobility complicates the art of designing and implementing these new...... provides a good communication abstraction for wireless networks of mobile nodes. In this paper we present PSI, a uniform publish-subscribe based infrastructure, for communication in wireless mobile environments. In PSI the application is divided into software components that each handles a well defined...

  4. A Methodology to Counter DoS Attacks in Mobile IP Communication

    Directory of Open Access Journals (Sweden)

    Sazia Parvin

    2012-01-01

    Full Text Available Similar to wired communication, Mobile IP communication is susceptible to various kinds of attacks. Of these attacks, Denial of Service (DoS attack is considered as a great threat to mobile IP communication. The number of approaches hitherto proposed to prevent DoS attack in the area of mobile IP communication is much less compared to those for the wired domain and mobile ad hoc networks. In this work, the effects of Denial of Service attack on mobile IP communication are analyzed in detail. We propose to use packet filtering techniques that work in different domains and base stations of mobile IP communication to detect suspicious packets and to improve the performance. If any packet contains a spoofed IP address which is created by DoS attackers, the proposed scheme can detect this and then filter the suspected packet. The proposed system can mitigate the effect of Denial of Service (DoS attack by applying three methods: (i by filtering in the domain periphery router (ii by filtering in the base station and (iii by queue monitoring at the vulnerable points of base-station node. We evaluate the performance of our proposed scheme using the network simulator NS-2. The results indicate that the proposed scheme is able to minimize the effects of Denial of Service attacks and improve the performance of mobile IP communication.

  5. Directedness of information flow in mobile phone communication networks.

    Directory of Open Access Journals (Sweden)

    Fernando Peruani

    Full Text Available Without having direct access to the information that is being exchanged, traces of information flow can be obtained by looking at temporal sequences of user interactions. These sequences can be represented as causality trees whose statistics result from a complex interplay between the topology of the underlying (social network and the time correlations among the communications. Here, we study causality trees in mobile-phone data, which can be represented as a dynamical directed network. This representation of the data reveals the existence of super-spreaders and super-receivers. We show that the tree statistics, respectively the information spreading process, are extremely sensitive to the in-out degree correlation exhibited by the users. We also learn that a given information, e.g., a rumor, would require users to retransmit it for more than 30 hours in order to cover a macroscopic fraction of the system. Our analysis indicates that topological node-node correlations of the underlying social network, while allowing the existence of information loops, they also promote information spreading. Temporal correlations, and therefore causality effects, are only visible as local phenomena and during short time scales. Consequently, the very idea that there is (intentional information spreading beyond a small vecinity is called into question. These results are obtained through a combination of theory and data analysis techniques.

  6. Directedness of information flow in mobile phone communication networks

    CERN Document Server

    Peruani, Fernando; 10.1371/journal.pone.0028860

    2013-01-01

    Without having direct access to the information that is being exchanged, traces of information flow can be obtained by looking at temporal sequences of user interactions. These sequences can be represented as causality trees whose statistics result from a complex interplay between the topology of the underlying (social) network and the time correlations among the communications. Here, we study causality trees in mobile-phone data, which can be represented as a dynamical directed network. This representation of the data reveals the existence of super-spreaders and super-receivers. We show that the tree statistics, respectively the information spreading process, are extremely sensitive to the in-out degree correlation exhibited by the users. We also learn that a given information, e.g., a rumor, would require users to retransmit it for more than 30 hours in order to cover a macroscopic fraction of the system. Our analysis indicates that topological node-node correlations of the underlying social network, while ...

  7. Robotic Communication Terminals as a Mobility Support System for Elderly and Disabled People(2)

    Science.gov (United States)

    Yairi, Ikuko Eguchi; Igi, Seiji

    We have been developing Robotic Communication Terminals (RCT) as a mobility support system for the elderly and disabled people, which assists for their impaired elements of mobility— recognition, actuation, and information access. The RCT consist of three types of terminals: “environment-embedded terminal”“user-carried mobile terminal”, and “user-carrying mobile terminal”. These terminals communicate with one another to provide the users with a comfortable means of mobility. In this paper, we introduce the overview of our research. The recent progress is also presented as well as the future plan.

  8. Satellite-Based EMI Detection, Identification, and Mitigation

    Science.gov (United States)

    Stottler, R.; Bowman, C.

    2016-09-01

    Commanding, controlling, and maintaining the health of satellites requires a clear operating spectrum for communications. Electro Magnetic Interference (EMI) from other satellites can interfere with these communications. Determining which satellite is at fault improves space situational awareness and can be used to avoid the problem in the future. The Rfi detection And Prediction Tool, Optimizing Resources (RAPTOR) monitors the satellite communication antenna signals to detect EMI (also called RFI for Radio Frequency Interference) using a neural network trained on past cases of both normal communications and EMI events. RAPTOR maintains a database of satellites that have violated the reserved spectrum in the past. When satellite-based EMI is detected, RAPTOR first checks this list to determine if any are angularly close to the satellite being communicated with. Additionally, RAPTOR checks the Space Catalog to see if any of its active satellites are angularly close. RAPTOR also consults on-line databases to determine if the described operating frequencies of the satellites match the detected EMI and recommends candidates to be added to the known offenders database, accordingly. Based on detected EMI and predicted orbits and frequencies, RAPTOR automatically reschedules satellite communications to avoid current and future satellite-based EMI. It also includes an intuitive display for a global network of satellite communications antennas and their statuses including the status of their EM spectrum. RAPTOR has been prototyped and tested with real data (amplitudes versus frequency over time) for both satellite communication signals and is currently undergoing full-scale development. This paper describes the RAPTOR technologies and results of testing.

  9. Big Data Analytics for Disaster Preparedness and Response of Mobile Communication Infrastructure during Natural Hazards

    Science.gov (United States)

    Zhong, L.; Takano, K.; Ji, Y.; Yamada, S.

    2015-12-01

    The disruption of telecommunications is one of the most critical disasters during natural hazards. As the rapid expanding of mobile communications, the mobile communication infrastructure plays a very fundamental role in the disaster response and recovery activities. For this reason, its disruption will lead to loss of life and property, due to information delays and errors. Therefore, disaster preparedness and response of mobile communication infrastructure itself is quite important. In many cases of experienced disasters, the disruption of mobile communication networks is usually caused by the network congestion and afterward long-term power outage. In order to reduce this disruption, the knowledge of communication demands during disasters is necessary. And big data analytics will provide a very promising way to predict the communication demands by analyzing the big amount of operational data of mobile users in a large-scale mobile network. Under the US-Japan collaborative project on 'Big Data and Disaster Research (BDD)' supported by the Japan Science and Technology Agency (JST) and National Science Foundation (NSF), we are going to investigate the application of big data techniques in the disaster preparedness and response of mobile communication infrastructure. Specifically, in this research, we have considered to exploit the big amount of operational information of mobile users for predicting the communications needs in different time and locations. By incorporating with other data such as shake distribution of an estimated major earthquake and the power outage map, we are able to provide the prediction information of stranded people who are difficult to confirm safety or ask for help due to network disruption. In addition, this result could further facilitate the network operators to assess the vulnerability of their infrastructure and make suitable decision for the disaster preparedness and response. In this presentation, we are going to introduce the

  10. A study on the role of mobile phone communication in tuberculosis DOTS treatment

    Directory of Open Access Journals (Sweden)

    R Elangovan

    2013-01-01

    Full Text Available Background: Every year, a lot of Tuberculosis (TB patients undergo Directly Observed Treatment Short-course (DOTS in Salem city, one of the high TB districts in South India. Mobile phone usage among these patients and health workers is common. Mobile phone communication has a great potential in TB treatment. Objectives: To analyze the mobile phone usage and its effectiveness in TB DOTS treatment. Materials and Methods: A cross-sectional survey with 150 TB patients was followed by a focus group discussion with treatment supervisors, DOTS providers, and health workers. Results: Majority of patients use mobile phones to make calls to health workers to clarify their doubts on side effects, food, and symptoms of the disease. TB treatment supervisors effectively use mobile phones to counsel patients to adhere to the treatment regimen. Patients see mobile phones as a useful communication tool in TB treatment though they prefer direct interpersonal communication with health workers. Though the mobile ownership is 68% among the TB patients, many of them are not able to send text messages or read messages in English. Conclusion: Mobile phone possession and usage is high among the patients. Patients need to be trained to use mobile phone features such as alarm, voice mail, and interactive voice response. Incentives like free talk time and short message service (SMS will encourage patients to communicate frequently with health workers, thereby, increasing the chances of better adherence to DOTS. SMS could be made available in the regional languages.

  11. A Solution of Secure Communication in the Current and Future Mobile Network

    Institute of Scientific and Technical Information of China (English)

    LI Dong; YANG Yi-xian; NIU Xin-xin; CHOU Hsi-tseng

    2005-01-01

    To secure wireless communication,this paper provides a solution based on the abilities of the current mobile terminals.This paper also proposes a mechanism that can secure the communication between the current mobile terminals and the Internet Web Server.Yield to the capabilities of the current mobile terminals,the public key techniques cannot be used now.But in the future,the memory space and the computation ability of the mobile terminals will no longer be any puzzles,so certificate and Public Key Infrastructure(PKI)can be used to make wireless communication security.This paper also proposes PKI architecture in the future mobile network.Finally this paper makes an assumption of the network's development and its secure issues.

  12. The eDL mobile app - Improving communication between hospitals, patients and community physicians

    NARCIS (Netherlands)

    Lezcano, Leonardo; Drachsler, Hendrik; Ternier, Stefaan; Kalz, Marco; Specht, Marcus

    2013-01-01

    Lezcano, L., Drachsler, H., Ternier, S., Kalz, M., & Specht, M. (2012, October). The eDL mobile app - Improving communication between hospitals, patients and community physicians. Presentation at the kickoff meeting of the Patient project, Heerlen, The Netherlands.

  13. An Active K-Band Receive Slot Array for Mobile Satellite Communications

    Science.gov (United States)

    Tulintseff, A. N.; Lee, K. A.; Sukamto, L. M.; Chew, W.

    1994-01-01

    An active receive slot array has been developed for operation in the downlink frequency band, 19.914-20.064 GHz, of NASA's Advanced Communication Technology Satellite (ACTS) for the ACTS Mobile Terminal (AMT) project.

  14. Technological Innovations and Consumer Needs: An Analysis of Mobile Communications Market

    Directory of Open Access Journals (Sweden)

    Norlia Ahmad

    2011-12-01

    Full Text Available This study combines insights from market diffusion and consumer research to provide an inte-grated framework of mobile communications market in Japan. We base our analysis on data from company interview, focus group discussion and industry reports. Our findings indicate that technology push dominates in the early introduction and consumer needs pull in the maturing stage. Three implications for the marketing area are; first, user needs for mobile communications have evolved from basic mobility and functionality to include aesthetic and experiential benefits, second, innovations of product capabilities co-evolve with user needs, and lead to increases in mobile usage and product-user attachments, and third, in a saturated market, mobile consumption is premised on the utilitarian and hedonic values as perceived by the users. As mobile phone is a universal product, analysis of a saturated market such as Japan provides a deeper understanding of the evolution of technology and consumer in other markets.

  15. The potential of FBMC over OFDM for the future 5G mobile communication technology

    Science.gov (United States)

    Ibrahim, A. N.; Abdullah, M. F. L.

    2017-09-01

    Fifth Generation (5G) is the new evolution of mobile communication technology and will be launched soon in many countries. The researchers and designers of mobile communication technology have been facing the increasing demand of the mobile consumers, high data rates and mobility requirements needed by new wireless applications. Most of the countries have started research on 5G mobile communication technology that is predictable to be launched on 2020 in conjunction with the Olympic Games in Tokyo. Filterbank Multicarrier (FBMC) is one of the modulation techniques for the future 5G mobile communication technology. It uses the multicarrier techniques that are immune to fading caused by transmission of more than one path at a time and also immune to intersymbol interference besides able to function effectively compared to Orthogonal Frequency Division Multiplexing (OFDM) which is used in Fourth Generation (4G) mobile communications technology. This paper discusses the performance of FBMC over OFDM based on the previous journals that were investigated by researchers.

  16. A social cognitive perspective on mobile communication technology use and adoption

    NARCIS (Netherlands)

    Peters, Oscar

    2009-01-01

    This study examined the triadic relationship between expected outcomes, habit strength, and mobile communication technology use and adoption within the model of media attendance (LaRose & Eastin, 2004). Mobile phone users (N = 644) were divided into two groups using a stratified random sampling meth

  17. [Change settings for visual analyzer of child users of mobile communication: longitudinal study].

    Science.gov (United States)

    Khorseva, N I; Grigor'ev, Iu G; Gorbunova, N V

    2014-01-01

    The paper represents theresults of longitudinal monitoring of the changes in the parameters of simple visual-motor reaction, the visual acuity and the rate of the visual discrimination in the child users of mobile communication, which indicate the multivariability of the possible effects of radiation from mobile phones on the auditory system of children.

  18. A P2P Architecture to Support Mobile Real-Time Multimedia Communications

    Directory of Open Access Journals (Sweden)

    Daniel G. Costa

    2010-10-01

    Full Text Available A new SIP standard based on peer to peer paradigm allows the keeping of user localization information in a decentralized way, adding flexibility to real-time mobile communications. Despite specification of terminal mobility in P2PSIP, handover procedures in transport-layer have better performance when compared with solutions in application-layer of Internet. SCTP transport protocol supports handover and a partial reliable communication service. Putting together P2PSIP and SCTP extensions, an end-to-end architecture can be proposed, aimed at the support of real-time multimedia applications with mobility requirements.

  19. A Mobile Device Software to Improve Construction Sites Communications "MoSIC"

    Directory of Open Access Journals (Sweden)

    Adel Khelifi

    2016-11-01

    Full Text Available Effective communication among project participants in construction sites is a real dilemma for construction projects productivity. To improve the efficiency of participants in construction projects and have a speedy delivery of these projects, this paper presents the development of a mobile application system to support construction site communication. The developed system is designed to enhance communication between home office employees, field office staff, and mobile users at the construction sites. It has two components: a mobile application and a website. The mobile application component provides users with valuable features such as, receive sites’ instructions, send requests for interpretations and retrieve information about projects. Whereas, the website component allows users, such as, home office employees to track projects’ progress and find projects’ location. The developed system is tested first on emulators and then on Android devices. After that the system was tested on a highway improvement project. Through their mobile phones, site users are able to interact with field office and home office personnel who use the web application to communicate with mobile users. It is expect that this work will contribute to facilitate communication in construction sites, which is much needed in this information intensive sector.

  20. Mobile Communication, Popular Protests and Citizenship in China

    DEFF Research Database (Denmark)

    Liu, Jun

    2013-01-01

    concrete popular protests in rural and urban areas, demonstrating how Chinese citizens have expanded the political uses of mobile phones in their struggle for freedom of information flow, social justice, and the rule of law, while seeking to build an inexpensive counter-public sphere. These processes......-sponsored information blockage. This in turn helps the Chinese people to maintain contact with each other, receive information from outside the country, and make political waves in an aggressive battle for control over information. This paper examines spontaneous mobilization via mobile phones, with a focus on two...

  1. Enhancing the Communication Range and Reliability of Mobile ADHOC Network Using AODV-OSPF Protocol

    Directory of Open Access Journals (Sweden)

    Onkar Nath Thakur,

    2014-02-01

    Full Text Available The increasing density of node and communication range of mobile node raised some problem such as dropping of packet and degraded the performance of network. For the improvement of performance of AODV routing Protocol in mobile ADHOC network various authors used different size of adjacency matrix in AODV routing protocol. In this paper proposed an improved AODV routing protocol using OSPF routing adjacency matrix in AODV protocol. The size of OSPF matrix is large instead of AODV.The change the size of matrix increases the communication range of mobile node. The increased range of communication increases the throughput of mobile ADHOC network. The proposed model simulates in ns-2.34 and compared with AODV routing protocol. Our experimental result shows better performance of AODV-OSPF routing protocol.

  2. Mobile free-space optical communications: a feasibility study of various battlefield scenarios

    Science.gov (United States)

    Harris, Alan; Al-Akkoumi, Mouhammad K.; Sluss, James J., Jr.

    2012-06-01

    Free Space Optics (FSO) technology was originally envisioned to be a viable solution for the provision of high bandwidth optical connectivity in the last mile of today's telecommunications infrastructure. Due to atmospheric limitations inherent to FSO technology, FSO is now widely envisioned as a solution for the provision of high bandwidth, temporary mobile communications links. The need for FSO communications links will increase as mobility is introduced to this technology. In this paper, a theoretical solution for adding mobility to FSO communication links is introduced. Three-dimensional power estimation studies are presented to represent mobile FSO transmission under various weather conditions. Three wavelengths, 0.85, 1.55 and 10 um, are tested and compared to illustrate the pros and cons of each source wavelength used for transmission, depending on prevalent weather conditions and atmospheric turbulence conditions. A simulation analysis of the transmission properties of the source wavelengths used in the study is shown.

  3. Sequential organization of text messages and mobile phone calls in interconnected communication sequences

    DEFF Research Database (Denmark)

    Laursen, D.

    2012-01-01

    This article investigates how text messages and mobile phone calls interrelate as parts of continuous communication sequences. Based on the recorded mobile communication of 14-year-olds in Denmark and a conversation-analytic approach, the article will show that after a text message in a continuous....../promise of a call). In itself, the change from text message to conversation requires no interactional efforts from the participants. However, changes of mode are related to the different communicative possibilities the text message and the phone call offer: text messages and calls have distinct formal qualities...

  4. iPads, mobile technologies, and communication applications: a survey of family wants, needs, and preferences.

    Science.gov (United States)

    Meder, Allison M; Wegner, Jane R

    2015-03-01

    Families of children with communication disabilities were surveyed to explore wants and preferences relative to mobile media technology, including iPads, as a form of augmentative and alternative communication (AAC). The families surveyed reported wanting information and support from professionals, including speech language pathologists (SLPs), who are knowledgeable about AAC. These families wanted devices to meet their children's individual needs and reported that ease of use and affordability were the most influential characteristics in the purchase of mobile media devices and communication applications. SLPs who understand family decision making can utilize collaborative clinical decision making that respects families' wants and needs, while also focusing on device feature matching and family education.

  5. Technology assessment for communication links for mobile users in a hostile environment

    Science.gov (United States)

    Lupinetti, Francesco

    1987-03-01

    Theoretical constraints for communication links where at least one of the users is a mobile unit are developed. Additional information on communication techniques which could be used to meet the requirements of these links is made available. Possible link architecture and characteristics for short term realization are presented. Suggestion on the not yet existing hardware which should be developed in order to meet all the field requirements of a long term communication system for a mobile user in a possibly hostile environment are also made.

  6. A mobile robots experimental environment with event-based wireless communication.

    Science.gov (United States)

    Guinaldo, María; Fábregas, Ernesto; Farias, Gonzalo; Dormido-Canto, Sebastián; Chaos, Dictino; Sánchez, José; Dormido, Sebastián

    2013-07-22

    An experimental platform to communicate between a set of mobile robots through a wireless network has been developed. The mobile robots get their position through a camera which performs as sensor. The video images are processed in a PC and a Waspmote card sends the corresponding position to each robot using the ZigBee standard. A distributed control algorithm based on event-triggered communications has been designed and implemented to bring the robots into the desired formation. Each robot communicates to its neighbors only at event times. Furthermore, a simulation tool has been developed to design and perform experiments with the system. An example of usage is presented.

  7. A communication theoretical analysis of FRET-based mobile ad hoc molecular nanonetworks.

    Science.gov (United States)

    Kuscu, Murat; Akan, Ozgur B

    2014-09-01

    Nanonetworks refer to a group of nanosized machines with very basic operational capabilities communicating to each other in order to accomplish more complex tasks such as in-body drug delivery, or chemical defense. Realizing reliable and high-rate communication between these nanomachines is a fundamental problem for the practicality of these nanonetworks. Recently, we have proposed a molecular communication method based on Förster Resonance Energy Transfer (FRET) which is a nonradiative excited state energy transfer phenomenon observed among fluorescent molecules, i.e., fluorophores. We have modeled the FRET-based communication channel considering the fluorophores as single-molecular immobile nanomachines, and shown its reliability at high rates, and practicality at the current stage of nanotechnology. In this study, for the first time in the literature, we investigate the network of mobile nanomachines communicating through FRET. We introduce two novel mobile molecular nanonetworks: FRET-based mobile molecular sensor/actor nanonetwork (FRET-MSAN) which is a distributed system of mobile fluorophores acting as sensor or actor node; and FRET-based mobile ad hoc molecular nanonetwork (FRET-MAMNET) which consists of fluorophore-based nanotransmitter, nanoreceivers and nanorelays. We model the single message propagation based on birth-death processes with continuous time Markov chains. We evaluate the performance of FRET-MSAN and FRET-MAMNET in terms of successful transmission probability and mean extinction time of the messages, system throughput, channel capacity and achievable communication rates.

  8. Design and Deployment of Mobile FSO Communication System

    KAUST Repository

    Alheadary, Wael Ghazy

    2017-05-08

    As a potential solution to many applications, we developed a mobile free-space optical (FSO) system that achieves 1Gbps with transmission distance of 70 m. This system needs minimal preparation to be deployed within an hour.

  9. TDMA-based dual-mode communication for mobile wireless sensor networks.

    Science.gov (United States)

    Mehta, Ankur; Kerkez, Branko; Glaser, Steven D; Pister, Kristofer S J

    2012-11-22

    Small highly mobile robots, and in particular micro air vehicles (MAVs), are well suited to the task of exploring unknown indoor environments such as buildings and caves. Such a task imposes a number of requirements on the underlying communication infrastructure, with differing goals during various stages of the mission. This work addresses those requirements with a hybrid communications infrastructure consisting of a stationary mesh network along with the mobile nodes. The combined network operates in two independent modes, coupling a highly efficient, low duty cycle, low throughput mode for routing and persistent sensing with a burst mode for high data rate communication. By strategically distributing available frequency channels between the mobile agents and the stationary nodes, the overall network provides reliable long-term communication paths while maximizing data throughput when needed.

  10. TDMA-Based Dual-Mode Communication for Mobile Wireless Sensor Networks

    Directory of Open Access Journals (Sweden)

    Ankur Mehta

    2012-11-01

    Full Text Available Small highly mobile robots, and in particular micro air vehicles (MAVs, are well suited to the task of exploring unknown indoor environments such as buildings and caves. Such a task imposes a number of requirements on the underlying communication infrastructure, with differing goals during various stages of the mission. This work addresses those requirements with a hybrid communications infrastructure consisting of a stationary mesh network along with the mobile nodes. The combined network operates in two independent modes, coupling a highly efficient, low duty cycle, low throughput mode for routing and persistent sensing with a burst mode for high data rate communication. By strategically distributing available frequency channels between the mobile agents and the stationary nodes, the overall network provides reliable long-term communication paths while maximizing data throughput when needed.

  11. Need for, and financial feasibility of, satellite-aided land mobile communications

    Science.gov (United States)

    Castruccio, P. A.; Marantz, C. S.; Freibaum, J.

    Questions regarding the role of a mobile-satellite system in augmenting the terrestrial communications system are considered, and a market assessment study is discussed. Aspects of an investment analysis are examined, taking into account a three phase financial study of four postulated land Mobile Satellite Service (LMSS) systems, project profitability evaluation methods, risk analysis methods, financial projections, potential investor acceptance standards, and a risk analysis. It is concluded that a satellite augmented terrestrial mobile service appears to be economically and technically superior to a service depending exclusively on terrestrial systems. The interest in the Mobile Satellite Service is found to be worldwide, and the ground equipment market is potentially large.

  12. 75 FR 17434 - In the Matter of Certain Personal Data and Mobile Communications Devices and Related Software...

    Science.gov (United States)

    2010-04-06

    ... COMMISSION In the Matter of Certain Personal Data and Mobile Communications Devices and Related Software... within the United States after importation of certain personal data and mobile communications devices and... communications devices or related software that infringe one or more of claims 1-3, 7, 12, and 32 of U.S....

  13. Mobile Technology and the Challenge to Promote a Communicative City in Indonesia. Case Study Bandung Metropolitan Area

    Science.gov (United States)

    Sutriadi, Ridwan

    2011-01-01

    The objective of this study is to assess the role of mobile technology to promote a communicative city in Indonesia. The focus is on mobile technologies as symbols of the latest information and communication technology (ICT). Communication influences the capacity building of the governmental planning employees to conduct better planning…

  14. Assessing reliable human mobility patterns from higher-order memory in mobile communications

    CERN Document Server

    De Domenico, Manlio; Arenas, Alex

    2016-01-01

    Understanding how people move within a geographic area, e.g. a city, a country or the whole world, is fundamental in several applications, from predicting the spatio-temporal evolution of an epidemics to inferring migration patterns. Mobile phone records provide an excellent proxy of human mobility, showing that movements exhibit a high level of memory. However, the precise role of memory in widely adopted proxies of mobility, as mobile phone records, is unknown. Here we use 560 millions of call detail records from Senegal to show that standard Markovian approaches, including higher-order ones, fail in capturing real mobility patterns and introduce spurious movements never observed in reality. We introduce an adaptive memory-driven approach to overcome such issues. At variance with Markovian models, it is able to realistically model conditional waiting times, i.e. the probability to stay in a specific area depending on individual's historical movements. Our results demonstrate that in standard mobility models...

  15. Laser Communication Demonstration System (LCDS) and future mobile satellite services

    Science.gov (United States)

    Chen, Chien-Chung; Wilhelm, Michael D.; Lesh, James R.

    1995-01-01

    The Laser Communications Demonstration System (LCDS) is a proposed in-orbit demonstration of high data rate laser communications technology conceived jointly by NASA and U.S. industry. The program objectives are to stimulate industry development and to demonstrate the readiness of high data rate optical communications in Earth orbit. For future global satellite communication systems using intersatellite links, laser communications technology can offer reduced mass and power requirements and higher channel bandwidths without regulatory constraints. As currently envisioned, LCDS will consist of one or two orbiting laser communications terminals capable of demonstrating high data rate (greater than 750Mbps) transmission in a dynamic space environment. Two study teams led by Motorola and Ball Aerospace are currently in the process of conducting a Phase A/B mission definition study of LCDS under contracts with JPL/NASA. The studies consist of future application survey, concept and requirements definition, and a point design of the laser communications flight demonstration. It is planned that a single demonstration system will be developed based on the study results. The Phase A/B study is expected to be completed by the coming June, and the current results of the study are presented in this paper.

  16. 3GPP SA2 architecture and functions for 5G mobile communication system

    Directory of Open Access Journals (Sweden)

    Junseok Kim

    2017-03-01

    Full Text Available The on-going development of Fifth Generation (5G mobile communication technology will be the cornerstone for applying Information and Communication Technology (ICT to various fields, e.g., smart city, smart home, connected car, etc. The 3rd Generation Partnership Project (3GPP, which has developed the most successful standard technologies in the mobile communication market such as Universal Mobile Telecommunication System (UMTS and Long Term Evolution (LTE, is currently carrying out the standardization of both 5G access network system and 5G core network system at the same time. Within 3GPP, Service and System Aspects Working Group 2 (SA2 is responsible for identifying the main functions and entities of the network. In December 2016, the 3GPP SA2 group finalized the first phase of study for the architecture and main functions of 5G mobile communication system under the study item of Next Generation system (NextGen. Currently, normative standardization is on-going based on the agreements made in the NextGen Phase 1 study. In this paper, we present the architecture and functions of 5G mobile communication system agreed in the NextGen study.

  17. Mobile phones and elderly people: a noisy communication.

    Science.gov (United States)

    Stamato, Cláudia; Moraes, Anamaria de

    2012-01-01

    Knowing the users is capital for building user-friendly digital interfaces. One way to think about the users is considering their familiarity with this technology. This article presents the results of twelve interviews with elderly people residing in the so-called South Zone of Rio de Janeiro (Brazil) who have used mobile phones over at least one year. It is part of the Doctor's Thesis "Mobile phones for elderly people - usability for social integration" ("Celulares para idosos - usabilidade a serviço da integração social"), which is targeted at ascertaining if the current mobile phones are user-friendly for elderly people. Through the technique of Guided Interviews, we found usage time, criteria for choice of phones, reasons for changes, preferences, and manners of use. Preliminarily, we have noticed differences in the behavior of the participating users and performed a qualitative analysis according to groups of age and gender.

  18. An Efficient Certificate Status Validation Method for Mobile Communication

    Institute of Scientific and Technical Information of China (English)

    ZHOUYongbin; QINGSihan; ZHANGZhenfeng; JIQingguang

    2004-01-01

    The huge success of mobile telephone and such other wireless digital devices have transformed business and the Inter'net. In order to protect the security of mobile commerce transaction, WAP forum specified the WAP security protocol and defined WPKI architecture. Certificate status checking is one of the challenging issues of PKI in wired settings~ and it is more challenging in the wireless world (that is WPKI here) due to the limitations of mobile devices. In this paper, several mechanisms for certificate status validation are summarized and compared, and a new efficient certificate status validation method for WPKI is presented based on commutative hashing and a variation of dynamic Merkle hash tree. The newly proposed scheme has the advantages of being efficient and secure. The computation of the tree is independent of the nodes’ relative location in the hash tree, thus simplifying the computation and verification process. The proposed scheme is compatible with both X.509 certificate and WTLS certificate.

  19. Mobile satellite communications technology - A summary of NASA activities

    Science.gov (United States)

    Dutzi, E. J.; Knouse, G. H.

    1986-01-01

    Studies in recent years indicate that future high-capacity mobile satellite systems are viable only if certain high-risk enabling technologies are developed. Accordingly, NASA has structured an advanced technology development program aimed at efficient utilization of orbit, spectrum, and power. Over the last two years, studies have concentrated on developing concepts and identifying cost drivers and other issues associated with the major technical areas of emphasis: vehicle antennas, speech compression, bandwidth-efficient digital modems, network architecture, mobile satellite channel characterization, and selected space segment technology. The program is now entering the next phase - breadboarding, development, and field experimentation.

  20. EVOLUTION OF WIRELESS MOBILE COMMUNICATION NETWORKS AND FUTURE OF CELLULAR MARKET IN INDIA

    Directory of Open Access Journals (Sweden)

    Arjun Kondur

    2012-10-01

    Full Text Available In this paper, we discuss the evolution of the mobile communication systems from GSM to LTE (2G to 4G and the trends in the mobile communication industry. The Global System for Mobile Communication (GSM is a well established cellular system targeted here due to its engineering success and the large number of users currently using the services. The flexibility of wireless networks over voice and data transmission makes it one of the most popular modes of communication. Evolution to next generation services depends on an addition of new services and new features to the existing networks or even an integration of different communication technologies. With the invention of the devices such as tablets and smart phones the need to improve the data transmission rates and transmission efficiency has increased to higher than ever before. In this paper, we focus at some of the important issues pertaining to the evolution of mobile communication networks and predict the future of the networks based on the analysis of the cellular market in India. Since GSM networks accounts for more than 75% of the world wide cellular network, only the evolution of GSM network has been discussed in this paper.

  1. Patient-clinician mobile communication: analyzing text messaging between adolescents with asthma and nurse case managers.

    Science.gov (United States)

    Yoo, Woohyun; Kim, Soo Yun; Hong, Yangsun; Chih, Ming-Yuan; Shah, Dhavan V; Gustafson, David H

    2015-01-01

    With the increasing penetration of digital mobile devices among adolescents, mobile texting messaging is emerging as a new channel for patient-clinician communication for this population. In particular, it can promote active communication between healthcare clinicians and adolescents with asthma. However, little is known about the content of the messages exchanged in medical encounters via mobile text messaging. Therefore, this study explored the content of text messaging between clinicians and adolescents with asthma. We collected a total of 2,953 text messages exchanged between 5 nurse case managers and 131 adolescents with asthma through a personal digital assistant. The text messages were coded using a scheme developed by adapting categories from the Roter Interaction Analysis System. Nurse case managers sent more text messages (n=2,639) than adolescents with asthma. Most messages sent by nurse case managers were targeted messages (n=2,475) directed at all adolescents with asthma, whereas there were relatively few tailored messages (n=164) that were created personally for an individual adolescent. In addition, both targeted and tailored messages emphasized task-focused behaviors over socioemotional behaviors. Likewise, text messages (n=314) sent by adolescents also emphasized task-focused over socioemotional behaviors. Mobile texting messaging has the potential to play an important role in patient-clinician communication. It promotes not only active interaction, but also patient-centered communication with clinicians. In order to achieve this potential, healthcare clinicians may need to focus on socioemotional communication as well as task-oriented communication.

  2. Satellite-based terrestrial production efficiency modeling

    Directory of Open Access Journals (Sweden)

    Obersteiner Michael

    2009-09-01

    Full Text Available Abstract Production efficiency models (PEMs are based on the theory of light use efficiency (LUE which states that a relatively constant relationship exists between photosynthetic carbon uptake and radiation receipt at the canopy level. Challenges remain however in the application of the PEM methodology to global net primary productivity (NPP monitoring. The objectives of this review are as follows: 1 to describe the general functioning of six PEMs (CASA; GLO-PEM; TURC; C-Fix; MOD17; and BEAMS identified in the literature; 2 to review each model to determine potential improvements to the general PEM methodology; 3 to review the related literature on satellite-based gross primary productivity (GPP and NPP modeling for additional possibilities for improvement; and 4 based on this review, propose items for coordinated research. This review noted a number of possibilities for improvement to the general PEM architecture - ranging from LUE to meteorological and satellite-based inputs. Current PEMs tend to treat the globe similarly in terms of physiological and meteorological factors, often ignoring unique regional aspects. Each of the existing PEMs has developed unique methods to estimate NPP and the combination of the most successful of these could lead to improvements. It may be beneficial to develop regional PEMs that can be combined under a global framework. The results of this review suggest the creation of a hybrid PEM could bring about a significant enhancement to the PEM methodology and thus terrestrial carbon flux modeling. Key items topping the PEM research agenda identified in this review include the following: LUE should not be assumed constant, but should vary by plant functional type (PFT or photosynthetic pathway; evidence is mounting that PEMs should consider incorporating diffuse radiation; continue to pursue relationships between satellite-derived variables and LUE, GPP and autotrophic respiration (Ra; there is an urgent need for

  3. The Microbial Contamination of Mobile Communication Devices †

    OpenAIRE

    Joanna Verran

    2012-01-01

    This tip describes a simple laboratory exercise to assess the microbial contamination of mobile phones, and suggests extension work that enables additional exploration of the topic. At its most basic, it is suitable for the school classroom; more advanced development of the suggested activities are suitable for undergraduate project work.

  4. Collaborating with Your Clients Using Social Media & Mobile Communications

    Science.gov (United States)

    Typhina, Eli; Bardon, Robert E.; Gharis, Laurie W.

    2015-01-01

    Many Extension educators are still learning how to effectively integrate social media into their programs. By using the right social media platforms and mobile applications to create engaged, online communities, Extension educators can collaborate with clients to produce and to share information expanding and enhancing their social media and…

  5. Acculturation and Communicative Mobility Among Former Soviet Nationalities.

    Science.gov (United States)

    Haarmann, Harald; Holman, Eugene

    1997-01-01

    Discusses the strategies that the former Soviet states are evolving to balance the interests of dominant ethnic groups with those of linguistic minorities while constructing a national identity, highlighting language policy in action and focusing on acculturation processes and geographic mobility among groups. A case study of Estonia is also…

  6. Time as a limited resource: Communication Strategy in Mobile Phone Networks

    CERN Document Server

    Miritello, Giovanna; Lara, Rubén; Martínez-López, Rocío; Roberts, Sam G B; Dunbar, Robin I M

    2013-01-01

    We used a large database of 9 billion calls from 20 million mobile users to examine the relationships between aggregated time spent on the phone, personal network size, tie strength and the way in which users distributed their limited time across their network (disparity). Compared to those with smaller networks, those with large networks did not devote proportionally more time to communication and had on average weaker ties (as measured by time spent communicating). Further, there were not substantially different levels of disparity between individuals, in that mobile users tend to distribute their time very unevenly across their network, with a large proportion of calls going to a small number of individuals. Together, these results suggest that there are time constraints which limit tie strength in large personal networks, and that even high levels of mobile communication do not fundamentally alter the disparity of time allocation across networks.

  7. What Happens After You Both Swipe Right: A Statistical Description of Mobile Dating Communications

    CERN Document Server

    Zhang, Jennie

    2016-01-01

    Mobile dating applications (MDAs) have skyrocketed in popularity in the last few years, with popular MDA Tinder alone matching 26 million pairs of users per day. In addition to becoming an influential part of modern dating culture, MDAs facilitate a unique form of mediated communication: dyadic mobile text messages between pairs of users who are not already acquainted. Furthermore, mobile dating has paved the way for analysis of these digital interactions via massive sets of data generated by the instant matching and messaging functions of its many platforms at an unprecedented scale. This paper looks at one of these sets of data: metadata of approximately two million conversations, containing 19 million messages, exchanged between 400,000 heterosexual users on an MDA. Through computational analysis methods, this study offers the very first large scale quantitative depiction of mobile dating as a whole. We report on differences in how heterosexual male and female users communicate with each other on MDAs, dif...

  8. Gendered, Bilingual Communication Practices: Mobile text-messaging among Hong Kong College Students

    Directory of Open Access Journals (Sweden)

    Angel Lin

    2005-01-01

    Full Text Available Mobile text messaging—variously known as SMS (short message service, text messaging, or texting—has become a common means of keeping in constant touch, especially among young people, in many parts of the world today. The research literature abounds with studies on the social, cultural, and communicative aspects of mobile text messaging in different sociocultural contexts in the world. In this paper, current theoretical positions in the research literature on mobile communication will be summarized and then findings of a pilot study on the mobile text-messaging practices of university students in Hong Kong will be reported. Implications for emerging bilingual and bicultural identities and gendered sociality practices among Hong Kong young people will be discussed.

  9. Enhancing the Communication Range and Reliability of Mobile ADHOC Network Using AODV-OSPF Protocol

    OpenAIRE

    Onkar Nath Thakur,; Amit Saxena

    2014-01-01

    The increasing density of node and communication range of mobile node raised some problem such as dropping of packet and degraded the performance of network. For the improvement of performance of AODV routing Protocol in mobile ADHOC network various authors used different size of adjacency matrix in AODV routing protocol. In this paper proposed an improved AODV routing protocol using OSPF routing adjacency matrix in AODV protocol. The size of OSPF matrix is large instead of AO...

  10. Analysis of the grounding system for a mobile communication site placed on HV power line mast

    Science.gov (United States)

    Bîrsan, I.; Munteanu, C.; Horgoș, M.; Ilut, T.

    2016-08-01

    This paper aims to analyze the potential distribution on the soil surface or potential variation on the main directions inside computing mobile site. I want to study a system made the earth a mobile communications site, antennas operator and the system of which the earth is placed on a High Voltage Power Line Mast (LEA 110 KV). I made direct measurements and I use a 3D software for analyze the results and simulating some possible solutions.

  11. A Simplified Mobile Ad Hoc Network Structure for Helicopter Communication

    Directory of Open Access Journals (Sweden)

    Abdeldime Mohamed Salih Abdelgader

    2016-01-01

    Full Text Available There are a number of volunteer and statutory organizations who are capable of conducting an emergency response using helicopters. Rescue operations require a rapidly deployable high bandwidth network to coordinate necessary relief efforts between rescue teams on the ground and helicopters. Due to massive destruction and loss of services, ordinary communication infrastructures may collapse in these situations. Consequently, information exchange becomes one of the major challenges in these circumstances. Helicopters can be also employed for providing many services in rugged environments, military applications, and aerial photography. Ad hoc network can be used to provide alternative communication link between a set of helicopters, particularly in case of significant amount of data required to be shared. This paper addresses the ability of using ad hoc networks to support the communication between a set of helicopters. A simplified network structure model is presented and extensively discussed. Furthermore, a streamlined routing algorithm is proposed. Comprehensive simulations are conducted to evaluate the proposed routing algorithm.

  12. Leveraging mobile smart devices to improve interprofessional communications in inpatient practice setting: A literature review.

    Science.gov (United States)

    Aungst, Timothy Dy; Belliveau, Paul

    2015-01-01

    As mobile smart device use has increased in society, the healthcare community has begun using these devices for communication among professionals in practice settings. The purpose of this review is to describe primary literature which reports on the experiences with interprofessional healthcare communication via mobile smart devices. Based on these findings, this review also addresses how these devices may be utilized to facilitate interprofessional education (IPE) in health professions education programs. The literature search revealed limited assessments of mobile smart device use in clinical practice settings. In available reports, communication with mobile smart devices was perceived as more effective and faster among interdisciplinary members. Notable drawbacks included discrepancies in the urgency labeling of messages, increased interruptions associated with constant accessibility to team members, and professionalism breakdowns. Recently developed interprofessional competencies include an emphasis on ensuring that health profession students can effectively communicate on interprofessional teams. With the increasing reliance on mobile smart devices in the absence of robust benefit and risk assessments on their use in clinical practice settings, use of these devices may be leveraged to facilitate IPE activities in health education professions programs while simultaneously educating students on their proper use in patient care settings.

  13. High-Speed Mobile Communications in Hostile Environments

    CERN Document Server

    AUTHOR|(SzGeCERN)739920; Sierra, Rodrigo; Chapron, Frederic; CERN. Geneva. IT Department

    2015-01-01

    With the inexorable increase in the use of mobile devices, wireless connectivity is expected by users anywhere, anytime. In general, this requirement is addressed in office buildings or public locations through the use of Wi-Fi technology but Wi-Fi is not well adapted for use in large experiment halls and complex underground environments, especially those where radiation exposure is an issue, such as the LHC tunnel and experimental caverns. 4G/LTE technology, however, looks to be well adapted to addressing mobility needs in such areas. We report here the studies CERN has undertaken on the use of 4G/LTE in the LHC tunnel, presenting results on the data throughput that can be achieved and discussing issues such as the provision of a consistent user experience.

  14. High-Speed Mobile Communications in Hostile Environments

    Science.gov (United States)

    Agosta, S.; Sierra, R.; Chapron, F.

    2015-12-01

    With the inexorable increase in the use of mobile devices, wireless connectivity is expected by users anywhere, anytime. In general, this requirement is addressed in office buildings or public locations through the use of Wi-Fi technology but Wi-Fi is not well adapted for use in large experiment halls and complex underground environments, especially those where radiation exposure is an issue, such as the LHC tunnel and experimental caverns. 4G/LTE technology, however, looks to be well adapted to addressing mobility needs in such areas. We report here the studies CERN has undertaken on the use of 4G/LTE in the LHC tunnel, presenting results on the data throughput that can be achieved and discussing issues such as the provision of a consistent user experience.

  15. A mobile communication device adapted to provide a dynamic display arrangement

    DEFF Research Database (Denmark)

    2011-01-01

    The invention relates to a mobile communication device comprising a light projector adapted to project a multi-coloured image onto a surface; a hinged mirror comprising a first mirror part adapted to be tilted around the hinge into the light path of the light projector; wherein the first mirror...... part comprises means for correcting a skew angle in the multi-coloured image projected onto a surface. Thereby is achieved that the mobile communication device is able to provide RGB full colour dynamic image projection which is preferred over monochromatic laser projection because it is a speckle free...

  16. Nationwide Mobile Communication Systems. Volume 3. Appendix B - D

    Science.gov (United States)

    1990-06-01

    1989. 16. American Radio Relay League, The ARRL Handbook For the Radio Amateur, 65th ed., Newington, Ct, 1988. 17. Shosteck, H., "Can Cellular Be Sold...34 Telephone Engineer and Management, 15 July 1987. 18. Official Cellular Radio Handbook , Cellular Directions, 1988. 19. Hand transcribed from Cellular... Handbook , John Wiley and Sons, 1989. 53. Ford Aerospace Corp., A Program to Calculate Mobile Satellite Revenue, by Mr. Al McCraken, 1988, (Lotus 123

  17. [The role of mobile communication devices in the spread of infections].

    Science.gov (United States)

    Morvai, Júlia; Szabó, Rita

    2015-05-17

    Mobile communication devices have an invaluable feature of communication within hospital, and they may support certain aspects of clinical diagnosis and education. However, there may be a risk for contamination of these devices with various pathogens. The aim of the authors was to perform a systematic review on the potential role of mobile communication devices in the dissemination of pathogens and to identify effective prevention measures. A detailed literature search was conducted using PubMed and ScienceDirect databases for papers published in English between January, 2004 and August, 2014. With the use of specific search term combinations 30 of the 216 articles met the inclusion criteria. It was found that only 8% of healthcare workers routinely cleaned their mobile communication devices resulting in a high rate of contamination (40-100%). Coagulase-negative Staphylococci and Staphylococcus aureus were the most commonly identified bacteria and most of them were methicillin resistant (10-95.3%). This systematic review identified effective interventions to reduce bacterial contamination risks including staff education, hand hygiene and regular decontamination of mobile communication devices.

  18. Research on Processing Multi-noise Signals in Mobile Multimedia Communication Based on HFC

    Institute of Scientific and Technical Information of China (English)

    ZENG Qinghui; HU Xiulin; ZHUANG Zhaowen; ZENG Yilin; MA Tao; ZHANG Yunyu; YANG Haizhou

    2001-01-01

    As well known, noise is one of mainobjects of signals processing. However, many kindsof noises are affecting widely on mobile communica-tion along with enlarging mobile networks and rapidlyincreasing application range of multimedia commu-nication. The noises include 1/f noise; burst noise;multichannel noise; thermal and shot noise etc., allof which here are called "multi-noise (MN)" and atthe same time, the signals affected by "multi-noise"is called "multi-noise signals". The article firstly ana-lyzes some disturbance factors of multi-noise that af-fects multimedia flow. Then, it describes briefly hi-erarchical fuzzy control (HFC) technology and its ap-plication procedure for online identification and con-trolling multi-noise signals in mobile multimedia com-munication networks. Lastly, how to make a specialhierarchical fuzzy control program is also discussed.With different test examples, the article demonstratesthe ability of hierarchical fuzzy control to identifyflow states and control signal distortion in multime-dia communication. The hierarchical fuzzy controland hierarchical fuzzy control programs provide anadvanced efficient tool for supervising the distributedstates of multi-noise and movement characteristics ofmulti-noise signals in mobile multimedia communica-tion.

  19. Assessing reliable human mobility patterns from higher order memory in mobile communications.

    Science.gov (United States)

    Matamalas, Joan T; De Domenico, Manlio; Arenas, Alex

    2016-08-01

    Understanding how people move within a geographical area, e.g. a city, a country or the whole world, is fundamental in several applications, from predicting the spatio-temporal evolution of an epidemic to inferring migration patterns. Mobile phone records provide an excellent proxy of human mobility, showing that movements exhibit a high level of memory. However, the precise role of memory in widely adopted proxies of mobility, as mobile phone records, is unknown. Here we use 560 million call detail records from Senegal to show that standard Markovian approaches, including higher order ones, fail in capturing real mobility patterns and introduce spurious movements never observed in reality. We introduce an adaptive memory-driven approach to overcome such issues. At variance with Markovian models, it is able to realistically model conditional waiting times, i.e. the probability to stay in a specific area depending on individuals' historical movements. Our results demonstrate that in standard mobility models the individuals tend to diffuse faster than observed in reality, whereas the predictions of the adaptive memory approach significantly agree with observations. We show that, as a consequence, the incidence and the geographical spread of a disease could be inadequately estimated when standard approaches are used, with crucial implications on resources deployment and policy-making during an epidemic outbreak.

  20. Can Mobile Technology Enable Knowledge Communication in a Learning Environment?

    DEFF Research Database (Denmark)

    Kampf, Constance; Islas Sedano, Carolina

    2008-01-01

     To be effective, knowledge management systems need to encompass both social processes and technical components (McDermott 2000),   On the other hand, knowledge communication as a concept has emerged not from the inspiration of technology, but partly from the social-technical challenge of dealing...

  1. "Going Mobile" in Business Communication at an Arabian Gulf University

    Science.gov (United States)

    Rapanta, Chrysi; Nickerson, Catherine; Goby, Valerie Priscilla

    2014-01-01

    In this article, we describe a project in which undergraduate business seniors at a university in the Arabian Gulf created or evaluated the chapters of an iBook as part of their final course in business communication. Students were surveyed throughout the project, and they also participated in a focus group discussion at the end. The aim was to…

  2. "Going Mobile" in Business Communication at an Arabian Gulf University

    Science.gov (United States)

    Rapanta, Chrysi; Nickerson, Catherine; Goby, Valerie Priscilla

    2014-01-01

    In this article, we describe a project in which undergraduate business seniors at a university in the Arabian Gulf created or evaluated the chapters of an iBook as part of their final course in business communication. Students were surveyed throughout the project, and they also participated in a focus group discussion at the end. The aim was to…

  3. The Architecture of Mobile Wallet System Based on NFC (Near Field Communication

    Directory of Open Access Journals (Sweden)

    Xiaohua Ma

    2014-03-01

    Full Text Available The study presented mobile wallet system architecture, in order that people can consume more convenient and efficient in life. Nowadays, existing mobile banking applications require real-time online and its tedious steps have been unable to meet needs of users. With the emergence of smart phones continues to heat up in the world, more and more payment methods use mobile payment. In addition, with the continuous improvement of mobile hardware devices, it will be possible that people can use mobile NFC (Near Field Communication tags for payment. This study realized the prototypical system of this architecture in the android environment. Consumer uses this application to achieve proximity payments, without networking. Consumer simply closes to the POS (Point of Sale devices gently, then the payment can be completed.

  4. THE SCHEME STUDY OF THE APPLICATION OF W-CDMA SPREAD SPECTRUM COMMUNICATION IN MINE MOBILE COMMUNICATION

    Institute of Scientific and Technical Information of China (English)

    杨维; 程时昕; 孙继平

    2000-01-01

    For the purpose of making the best use of the mine frequency resource and realizing the instruction idea “to exchange bandwidth for distance" a W-CDMA mine spread spectrum mobile communication scheme based on spread spectrum communication technique and the propagation characteristic of electromagnetic wave along laneways is proposed.The structure and make up of the system are studied and the working frequency and channels are assigned.Analysis indicates the scheme is a simple one that can fulfill the mine saying requirement.

  5. New horizons in mobile and wireless communications, v.4 ad hoc networks and pans

    CERN Document Server

    Prasad, Ramjee

    2009-01-01

    Based on cutting-edge research projects in the field, this book (part of a comprehensive 4-volume series) provides the latest details and covers the most impactful aspects of mobile, wireless, and broadband communications development. These books present key systems and enabling technologies in a clear and accessible manner, offering you a detailed roadmap the future evolution of next generation communications. Other volumes cover Networks, Services and Applications; Reconfigurability; and Ad Hoc Networks.

  6. LED to LED communication with WDM concept for flash light of Mobile phones

    Directory of Open Access Journals (Sweden)

    Devendra J Varanva

    2013-08-01

    Full Text Available After observing recent developments in Free Space Optical Communication especially Visible Light Communication, It is clear that LED is main component as a source. LED being solid state device makes endless list of possibilities. But here we will get through its ability to sense light as well, and use of Wavelength Division Multiplexing (WDM in mobile flash is also suggested, this opens door to many applications.

  7. [Problems of harmonization of sanitary regulations of the electromagnetic fields of mobile radio communication equipment].

    Science.gov (United States)

    Pal'tsev, Iu P; Pokhodzeĭ, L V; Rubtsova, N B; Bogacheva, E V

    2013-01-01

    In the article there are presented data on the probable adverse effects of electromagnetic fields generated by means of mobile cellulary radio communication equipment, a comparative analysis of hygienic rating and methods of measurement of their parameters in Russia and abroad has been performed, and the ways of harmonizing hygienic rules have been outlined, the necessity of further research to risk assessment of the use of cellular radio communication devices by population and preventive measures have been substantiated.

  8. New horizons in mobile and wireless communications, v.2 networks, services and applications

    CERN Document Server

    Prasad, Ramjee

    2009-01-01

    Based on cutting-edge research projects in the field, this book (part of a comprehensive 4-volume series) provides the latest details and covers the most impactful aspects of mobile, wireless, and broadband communications development. These books present key systems and enabling technologies in a clear and accessible manner, offering you a detailed roadmap the future evolution of next generation communications. Other volumes cover Networks, Services and Applications; Reconfigurability; and Ad Hoc Networks.

  9. New horizons in mobile and wireless communications, v.1 radio interfaces

    CERN Document Server

    Prasad, Ramjee

    2009-01-01

    Based on cutting-edge research projects in the field, this book (part of a comprehensive 4-volume series) provides the latest details and covers the most impactful aspects of mobile, wireless, and broadband communications development. These books present key systems and enabling technologies in a clear and accessible manner, offering you a detailed roadmap the future evolution of next generation communications. Other volumes cover Networks, Services and Applications; Reconfigurability; and Ad Hoc Networks.

  10. Acoustic Communications and Navigation for Mobile Under-Ice Sensors

    Science.gov (United States)

    2014-09-30

    urethane-filled hose with spiral conductors for the through- ice transition where a cable would be vulnerable. The buoy is designed to float after melting ...project is that it allows a drifting, ice -tethered navigation and communications system to be employed in the Arctic during times when it is not possible...performing tactical missions under Arctic ice . Potential programs for transition include LD-UUV if an Arctic version is fielded in the future. RELATED

  11. Downsizing Antenna Technologies for Mobile and Satellite Communications

    Science.gov (United States)

    Huang, J.; Densmore, A.; Tulintseff, A.; Jamnejad, V.

    1993-01-01

    Due to the increasing and stringent functional requirements (larger capacity, longer distances, etc.) of modern day communication systems, higher antenna gains are generally needed. This higher gain implies larger antenna size and mass which are undesirable to many systems. Consequently, downsizing antenna technology becomes one of the most critical areas for research and development efforts. Techniques to reduce antenna size can be categorized and are briefly discussed.

  12. LMI Fuzzy Observer Design for Cryptography in Wireless Mobile Communications

    Directory of Open Access Journals (Sweden)

    P.Sivakumar

    2013-07-01

    Full Text Available Recently the engineering community began to seek the possibly application of chaos. The fact that the cryptographic community had used discrete pseudo-chaotic systems for a long time to generate cipher keys that leads to the initiation of applying chaos to secure communications. This paper presents a schematic design methodology for a fuzzy observer based secure communication of hyper chaotic systems in cryptographic applications. The transmitter and receiver, which are based on a 3D hyper chaotic oscillator, are synchronized by exploiting the concept on the observer from the control theory. The scalar transmitted signal is designed so that the hyper chaotic carrier masks the encrypted signal, which in turn hides the message signal. To encrypt the message signal, an n-shirt cipher with multiple key algorithms is proposed. In receiver side, the fuzzy observer of chaotic system is designed based on the general Takagi-Sugeno fuzzy model. This approach leads to the design of communication systems with higher security.

  13. Study of LEO-SAT microwave link for broad-band mobile satellite communication system

    Science.gov (United States)

    Fujise, Masayuki; Chujo, Wataru; Chiba, Isamu; Furuhama, Yoji; Kawabata, Kazuaki; Konishi, Yoshihiko

    1993-01-01

    In the field of mobile satellite communications, a system based on low-earth-orbit satellites (LEO-SAT's) such as the Iridium system has been proposed. The LEO-SAT system is able to offer mobile telecommunication services in high-latitude areas. Rain degradation, fading and shadowing are also expected to be decreased when the system is operated at a high elevation angle. Furthermore, the propagation delay generated in the LEO-SAT system is less pronounced than that in the geostationary orbit satellite (GEO-SAT) system and, in voice services, the effect of the delay is almost negligible. We proposed a concept of a broad-band mobile satellite communication system with LEO-SAT's and Optical ISL. In that system, a fixed L-band (1.6/1.5 GHz) multibeam is used to offer narrow band service to the mobile terminals in the entire area covered by a LEO-SAT and steerable Ka-band (30/20 GHz) spot beams are used for the wide band service. In this paper, we present results of a study of LEO-SAT microwave link between a satellite and a mobile terminal for a broad-band mobile satellite communication system. First, the results of link budget calculations are presented and the antennas mounted on satellites are shown. For a future mobile antenna technology, we also show digital beamforming (DBF) techniques. DBF, together with modulation and/or demodulation, is becoming a key technique for mobile antennas with advanced functions such as antenna pattern calibration, correction, and radio interference suppression. In this paper, efficient DBF techniques for transmitting and receiving are presented. Furthermore, an adaptive array antenna system suitable for this LEO-SAT is presented.

  14. Mobile communication tools for a South African deaf patient in a pharmacy context

    NARCIS (Netherlands)

    Chininthorn, P.; Glaser, M.; Freudenthal, A.; Tucker, W.D.

    2012-01-01

    This paper presents a case of iterative community-based co-design to facilitate the emergence of an innovative mobile system to address a potentially life-threatening scenario for Deaf people in South Africa. For Deaf people who communicate in South African Sign Language, miscommunication due to lan

  15. Tantalisingly Close: An Archaeology of Communication Desires in Discourses of Mobile Wireless Media

    NARCIS (Netherlands)

    de Vries, I.O.

    2008-01-01

    While many studies on mobile wireless communication devices predominantly take a micro-scale approach and concentrate their often ethnographically informed focus on use values, social implications, conversation strategies, changing norms and ethics, culture-dependent domestication, and so forth, wit

  16. A Knowledge Based System for the Design of Mobile Subscriber Equipment Communications Networks.

    Science.gov (United States)

    1985-12-01

    organic chemistry , and medical diagnosis (20:5-6). Expert systems are generally composed of three parts: a database containing the specialized domain...Pennsylvania, 26 March 1984. 31. Schaum , Don and others. "MSE: Mobile Subscriber Equipment," Army Communicator, 9: 6-22 (Fall 1984). 32. Schneider, G

  17. Tantalisingly Close: An Archaeology of Communication Desires in Discourses of Mobile Wireless Media

    NARCIS (Netherlands)

    de Vries, I.O.|info:eu-repo/dai/nl/304832332

    2008-01-01

    While many studies on mobile wireless communication devices predominantly take a micro-scale approach and concentrate their often ethnographically informed focus on use values, social implications, conversation strategies, changing norms and ethics, culture-dependent domestication, and so forth, wit

  18. Mobile communication tools for a South African deaf patient in a pharmacy context

    NARCIS (Netherlands)

    Chininthorn, P.; Glaser, M.; Freudenthal, A.; Tucker, W.D.

    2012-01-01

    This paper presents a case of iterative community-based co-design to facilitate the emergence of an innovative mobile system to address a potentially life-threatening scenario for Deaf people in South Africa. For Deaf people who communicate in South African Sign Language, miscommunication due to lan

  19. Faculty Use and Perception of Mobile Information and Communication Technology (m-ICT) for Teaching Practices

    Science.gov (United States)

    Biddix, J. Patrick; Chung, Chung Joo; Park, Han Woo

    2016-01-01

    The purpose of this study was to consider faculty use and perception of mobile information and communication technology (m-ICT) for teaching practices. The researchers examined qualitative responses about specific m-ICT use and efficiency amongst Korean and US faculty (n = 59) at three different institutions. Findings from multi-level textual…

  20. Faculty Use and Perception of Mobile Information and Communication Technology (m-ICT) for Teaching Practices

    Science.gov (United States)

    Biddix, J. Patrick; Chung, Chung Joo; Park, Han Woo

    2016-01-01

    The purpose of this study was to consider faculty use and perception of mobile information and communication technology (m-ICT) for teaching practices. The researchers examined qualitative responses about specific m-ICT use and efficiency amongst Korean and US faculty (n = 59) at three different institutions. Findings from multi-level textual…

  1. Aspects of High-Q Tunable Antennas and Their Deployment for 4G Mobile Communications

    DEFF Research Database (Denmark)

    Bahramzy, Pevand; Jagielski, Ole; Svendsen, Simon;

    2016-01-01

    Tunable antennas are very promising for future generations of mobile communications, where broad frequency coverage will be required increasingly. This work describes the design of small high-Quality factor (Q) tunable antennas based on Micro-Electro-Mechanical Systems (MEMS), which are capable...

  2. Cooperation Dynamics on Mobile Crowd Networks of Device-to-Device Communications

    Directory of Open Access Journals (Sweden)

    Yong Deng

    2016-01-01

    Full Text Available The explosive use of smart devices enabled the emergence of collective resource sharing among mobile individuals. Mobile users need to cooperate with each other to improve the whole network’s quality of service. By modeling the cooperative behaviors in a mobile crowd into an evolutionary Prisoner’s dilemma game, we investigate the relationships between cooperation rate and some main influence factors, including crowd density, communication range, temptation to defect, and mobility attributes. Using evolutionary game theory, our analysis on the cooperative behaviors of mobile takes a deep insight into the cooperation promotion in a dynamical network with selfish autonomous users. The experiment results show that mobile user’s features, including speed, moving probability, and reaction radius, have an obvious influence on the formation of a cooperative mobile social network. We also found some optimal status when the crowd’s cooperation rate reaches the best. These findings are important if we want to establish a mobile social network with a good performance.

  3. Design of a Mobile Agent-Based Adaptive Communication Middleware for Federations of Critical Infrastructure Simulations

    Science.gov (United States)

    Görbil, Gökçe; Gelenbe, Erol

    The simulation of critical infrastructures (CI) can involve the use of diverse domain specific simulators that run on geographically distant sites. These diverse simulators must then be coordinated to run concurrently in order to evaluate the performance of critical infrastructures which influence each other, especially in emergency or resource-critical situations. We therefore describe the design of an adaptive communication middleware that provides reliable and real-time one-to-one and group communications for federations of CI simulators over a wide-area network (WAN). The proposed middleware is composed of mobile agent-based peer-to-peer (P2P) overlays, called virtual networks (VNets), to enable resilient, adaptive and real-time communications over unreliable and dynamic physical networks (PNets). The autonomous software agents comprising the communication middleware monitor their performance and the underlying PNet, and dynamically adapt the P2P overlay and migrate over the PNet in order to optimize communications according to the requirements of the federation and the current conditions of the PNet. Reliable communications is provided via redundancy within the communication middleware and intelligent migration of agents over the PNet. The proposed middleware integrates security methods in order to protect the communication infrastructure against attacks and provide privacy and anonymity to the participants of the federation. Experiments with an initial version of the communication middleware over a real-life networking testbed show that promising improvements can be obtained for unicast and group communications via the agent migration capability of our middleware.

  4. Security Challenges in Multicast Communication for Mobile Ad Hoc Network

    Directory of Open Access Journals (Sweden)

    S. Gunasekaran

    2010-01-01

    Full Text Available Problem statement: Multicasting communication network accepted a single message from an application and delivered copies of the message to multiple recipients at different locations. Recently, there has been an explosion of research literature on multicast communication environment. The objective of this study were to contribute the complexity of supporting current multicast applications, (i the lack of reliable multicast transport mechanisms at the network level and (ii the lack of network support for large scale multicast communication. The scaling problem of secure multicast key distribution compounded for the case where sender-specific keys need to be distributed to a group and required for sender-specific authentication of data traffic and minimize control overhead (iii compare RC4, AES-128,RS(2 and RS(3 computation time of both algorithms. Approach: Algorithms were collected and performed computation time. In general the multicast key distribution scheme implemented for distributing 128 bit session keys. Thus the Maximum Distance Separable Codes (MDS Codes needed for their encoding and decoding process. In rekeying scheme errors were occurred during over period of time or at a particular point of time and to eliminate all these errors in the level of encryption and decryption mechanism. The MDS codes played an important role in providing security services for multicast, such as traffic, integrity, authentication and confidentiality, is particularly problematic since it requires securely distributing a group (session key to each of a group’s receivers. Results: First we showed that internet multicasting algorithms based on reverse path forwarding were inherently unreliable and present a source-tree-based reliable multicasting scheme also. The new scheme proposed and used as an inter-gateway protocol and worked on top of the previously developed distance vector and link state internet routing schemes. Next, to support large scale

  5. Meaner on Mobile: Incivility and Impoliteness in Communicating Contentious Politics on Sociotechnical Networks

    Directory of Open Access Journals (Sweden)

    Jacob Groshek

    2016-11-01

    Full Text Available This study explores the nature of how mobile social media may potentially be sharpening the tenor of communicating online. Specifically, randomized representative Twitter data were collected for several controversial issues, and then examined to determine the extent to which mobile or web-based content tends more toward greater incivility and impoliteness. Additional analyses further model how certain dialogic features, such as explicitly mentioning other users and retweeting others’ posts, positively relate to hostility in the discourse. Building on the basis of technological affordances and user negotiation in digitally mediated environments, this study contributes to a better understanding of how individuals express themselves on mobile devices as these are rapidly becoming normalized modes for communicating with one another online.

  6. A study and experiment plan for digital mobile communication via satellite

    Science.gov (United States)

    Jones, J. J.; Craighill, E. J.; Evans, R. G.; Vincze, A. D.; Tom, N. N.

    1978-01-01

    The viability of mobile communications is examined within the context of a frequency division multiple access, single channel per carrier satellite system emphasizing digital techniques to serve a large population of users. The intent is to provide the mobile users with a grade of service consistant with the requirements for remote, rural (perhaps emergency) voice communications, but which approaches toll quality speech. A traffic model is derived on which to base the determination of the required maximum number of satellite channels to provide the anticipated level of service. Various voice digitalization and digital modulation schemes are reviewed along with a general link analysis of the mobile system. Demand assignment multiple access considerations and analysis tradeoffs are presented. Finally, a completed configuration is described.

  7. On Issues about the Application of MIMO in Mobile Cellular Communications

    Institute of Scientific and Technical Information of China (English)

    REN Li-gang; SONG Mei; SONG Jun-de

    2004-01-01

    The convenience of mobile communications and the increasing demand for higher data transmitting rate have motivated people to explore more efficient methods of signal transmission because of the limited spectral resource. Multiple-Input and Multiple-Output (MIMO) is a high spectral efficient method and the theoretical capacity of a MIMO channel increases linearly with the number of transmitting/receiving antennas under the ideal conditions. We can adopt MIMO technology in the new generation of mobile cellular communication systems, which is IP based and requires high data rate to support multimedia services. Although much progress has been made in MIMO area recently, there are some problems in its practical application, especially in cellular application. In this paper we will analyze the channel model, the capacity and the technology of MIMO, and then we will focus on the issues of MIMO application in mobile cellular system by the Monte Carlo simulation and give the available solution schemes for the issues.

  8. An efficient and secure anonymous authentication scheme for mobile satellite communication systems

    Directory of Open Access Journals (Sweden)

    Yoo Kee-Young

    2011-01-01

    Full Text Available Abstract This paper proposes a new efficient and secure anonymous authentication scheme for mobile satellite communication systems. Compared with the related schemes, the proposed scheme achieves the following three main advantages: (1 It is just based on a secure one-way hash function for avoiding complex computations for both mobile users and network control center (NCC, (2 it does not require sensitive verification table which may cause NCC to become an attractive target for numerous attacks (e.g., insertion attacks and stolen-verifier attacks, and (3 it provides higher security level (e.g., secure mutual authentication and key establishment, confidential communication, user's privacy, simple key management, and session key independence. As a result, the proposed scheme is very suitable for lightweight-device environments because of very low computation overload on the part of both mobile user and NCC.

  9. TRUSTWORTHY ENABLED RELIABLE COMMUNICATION ARCHITECTURE IN MOBILE AD HOC NETWORK

    Directory of Open Access Journals (Sweden)

    Saravanan Dhavamani

    2014-01-01

    Full Text Available Ad hoc networks are widely used in military and other scientific area. There are various kind of routing protocols are available to establish the route, with the proper analyzation one can choose the routing protocol to form their own network with respect to number of nodes and security considerations. The mobility of nodes makes the environment infrastructure less. It also has a certain number of characteristics which makes the security difficult. A trust recommendation mechanism has designed to keep track of node’s behavior to establish the trustworthiness of the network. Meanwhile with this trustworthiness a node can make objective judgment among another node’s trustworthiness to maintain whole system at a certain security level. The motivation of the work is to understanding the behavior or routing protocol and the trustworthiness.

  10. Improving Capacity of soft Handoff Performance in Wireless Mobile Communication using Macro Diversity

    Directory of Open Access Journals (Sweden)

    Vipin Kumar Saini,

    2011-06-01

    Full Text Available The soft handoff is a process on transferring the on going call from one radio resource to another radio resource without any interruption. Rather, mobile unit looks next base station for possible new connection without breaking the old connection. This transfer of call takes place, when the mobile unit moves far away from old base station and approach toward new base station. At the far away distance from old base station, the signal to noise power at the mobile unit becomes poorer and the service quality get degrade. At this far away distance mobile unit may see the another new base station, which may provide the better signal to noise ratio of the same signal via mobile switching center (MSC. Thus the mobile unit may get the same signal from the two different base stations simultaneously. The capacity of the CDMA communication network depends on the diversity technique used. The capacity gain of CDMA communication network can be defined by the comparison of network capacity with macro diversity and without macro diversity. In This paper we represented the capacity as number of users increases with Micro diversity as compared to capacity without Micro diversity.

  11. Satellite-Based Sunshine Duration for Europe

    Directory of Open Access Journals (Sweden)

    Bodo Ahrens

    2013-06-01

    Full Text Available In this study, two different methods were applied to derive daily and monthly sunshine duration based on high-resolution satellite products provided by the European Organisation for the Exploitation of Meteorological Satellites (EUMETSAT Satellite Application Facility on Climate Monitoring using data from Meteosat Second Generation (MSG SEVIRI (Spinning Enhanced Visible and Infrared Imager. The satellite products were either hourly cloud type or hourly surface incoming direct radiation. The satellite sunshine duration estimates were not found to be significantly different using the native 15-minute temporal resolution of SEVIRI. The satellite-based sunshine duration products give additional spatial information over the European continent compared with equivalent in situ-based products. An evaluation of the satellite sunshine duration by product intercomparison and against station measurements was carried out to determine their accuracy. The satellite data were found to be within ±1 h/day compared to high-quality Baseline Surface Radiation Network or surface synoptic observations (SYNOP station measurements. The satellite-based products differ more over the oceans than over land, mainly because of the treatment of fractional clouds in the cloud type-based sunshine duration product. This paper presents the methods used to derive the satellite sunshine duration products and the performance of the different retrievals. The main benefits and disadvantages compared to station-based products are also discussed.

  12. Accuracy Enhancements for Positioning of Mobile Devices in Wireless Communication Networks

    DEFF Research Database (Denmark)

    Figueiras, Joao

    Positioning of mobile devices in wireless communication networks is nowadays being intensively investigated due to the combined benefit of location information and communication. Typical solutions for such scenario rely on robust algorithms that estimate position from indirect measurements...... of the physical length of the communication links. Since these solutions do not require integration of additional hardware into the mobile nodes, they are cheap and simple to implement. As a price to pay, accuracy is typically lower in comparison to dedicated positioning systems. Thus, an important challenge...... systems. Since the measurement sampling is also important for tracking moving devices, the first analysis concerns the latency time for obtaining location information in short-range ad-hoc networks. Bluetooth is the elected technology since it is an actual example of such kind of networks. Simulations...

  13. Patient–Clinician Mobile Communication: Analyzing Text Messaging Between Adolescents with Asthma and Nurse Case Managers

    Science.gov (United States)

    Kim, Soo Yun; Hong, Yangsun; Chih, Ming-Yuan; Shah, Dhavan V.; Gustafson, David H.

    2015-01-01

    Abstract Background: With the increasing penetration of digital mobile devices among adolescents, mobile texting messaging is emerging as a new channel for patient–clinician communication for this population. In particular, it can promote active communication between healthcare clinicians and adolescents with asthma. However, little is known about the content of the messages exchanged in medical encounters via mobile text messaging. Therefore, this study explored the content of text messaging between clinicians and adolescents with asthma. Materials and Methods: We collected a total of 2,953 text messages exchanged between 5 nurse case managers and 131 adolescents with asthma through a personal digital assistant. The text messages were coded using a scheme developed by adapting categories from the Roter Interaction Analysis System. Results: Nurse case managers sent more text messages (n=2,639) than adolescents with asthma. Most messages sent by nurse case managers were targeted messages (n=2,475) directed at all adolescents with asthma, whereas there were relatively few tailored messages (n=164) that were created personally for an individual adolescent. In addition, both targeted and tailored messages emphasized task-focused behaviors over socioemotional behaviors. Likewise, text messages (n=314) sent by adolescents also emphasized task-focused over socioemotional behaviors. Conclusions: Mobile texting messaging has the potential to play an important role in patient–clinician communication. It promotes not only active interaction, but also patient-centered communication with clinicians. In order to achieve this potential, healthcare clinicians may need to focus on socioemotional communication as well as task-oriented communication. PMID:25401324

  14. Mission-Critical Mobile Broadband Communications in Open Pit Mines

    DEFF Research Database (Denmark)

    Uzeda Garcia, Luis Guilherme; Portela Lopes de Almeida, Erika; Barbosa, Viviane S. B.

    2016-01-01

    that need to be met by the wireless network. This article introduces fundamental concepts behind open-pit mining and discusses why this ever changing environment coupled with strict industrial reliability requirements pose unique challenges to traditional broadband network planning and optimization......The need for continuous safety improvements and increased operational efficiency is driving the mining industry through a transition towards automated operations. From a communications perspective, this transition introduces a new set of high-bandwidth business- and mission-critical applications...... techniques. On the other hand, unlike unpredictable disaster scenarios, mining is a carefully planned activity. Taking advantage of this predictability element, we propose a framework that integrates mine and network planning so that continuous and automated adaptation of the network becomes possible...

  15. Use of mobile application: Means of communication between Parents and Class Teacher

    Directory of Open Access Journals (Sweden)

    Mustafa Harun CAN

    2016-11-01

    Full Text Available Collaboration in between parents and teachers is an important step for student’s achievement. Stakeholders in education sector are trying to find best solution to encourage parents’ involvement in school activities. To involve parents in schooling activities and in other events, a good info-notice system should be established. Teachers should give exact information about any student’s progress as well as other information. In Nepal, most of the schools use notebook called “communication book or school diary as the means of communication with parents”. This traditional and most known system is still being used in many parts of the country. Class Teacher writes down a note or notice to parents on it about any information of current activities or forth coming events. The use of mobile applications has been increasing rapidly, and is being used in many aspects in education. The aim of this study is to investigate parents’ view on using mobile application to communicate with teachers. The Meridian Connect mobile application, which has been widely coming in use in between parents and class teachers, is used for this research. The study was designed to apply the questionnaire based survey methodology in which 573 parents of the students of Meridian International School were asked.. The results of data analysis indicated that parents’ view on the use of mobile application to upgrade the education environment has been proved to be positive and useful

  16. Enhancing Motivation in Online Courses with Mobile Communication Tool Support: A Comparative Study

    Directory of Open Access Journals (Sweden)

    Chantorn Chaiprasurt

    2013-07-01

    Full Text Available Mobile technologies have helped establish new channels of communication among learners and instructors, potentially providing greater access to course information, and promoting easier access to course activities and learner motivation in online learning environments. The paper compares motivation between groups of learners being taught through an online course based on an e-learning system with and without the support of mobile communication tools, respectively. These tools, which are implemented on a mobile phone, extend the use of the existing Moodle learning management system (LMS under the guidance of a mobile communication tools framework. This framework is considered to be effective in promoting learner motivation and encouraging interaction between learners and instructors as well as among learner peers in online learning environments. A quasi-experimental research design was used to empirically investigate the influence of these tools on learner motivation using subjective assessment (for attention, relevance, confidence, satisfaction, and social ability and objective assessment (for disengagement, engagement, and academic performance. The results indicate that the use of the tools was effective in improving learner motivation, especially in terms of the attention and engagement variables. Overall, there were statistically significant differences in subjective motivation, with a higher level achieved by experimental-group learners (supported by the tools than control-group learners (unsupported by the tools.

  17. Towards Efficient Mobile M2M Communications: Survey and Open Challenges

    Science.gov (United States)

    Pereira, Carlos; Aguiar, Ana

    2014-01-01

    Machine-to-Machine (M2M) communications enable networked devices and services to exchange information and perform actions seamlessly without the need for human intervention. They are viewed as a key enabler of the Internet of Things (IoT) and ubiquitous applications, like mobile healthcare, telemetry, or intelligent transport systems. We survey existing work on mobile M2M communications, we identify open challenges that have a direct impact on performance and resource usage efficiency, especially the impact on energy efficiency, and we review techniques to improve communications. We review the ETSI standard and application protocols, and draw considerations on the impact of their use in constrained mobile devices. Nowadays, smartphones are equipped with a wide range of embedded sensors, with varied local and wide area connectivity capabilities, and thus they offer a unique opportunity to serve as mobile gateways for other more constrained devices with local connectivity. At the same time, they can gather context data about users and environment from the embedded sensors. These capabilities may be crucial for mobile M2M applications. Finally, in this paper, we consider a scenario where smartphones are used as gateways that collect and aggregate data from sensors in a cellular network. We conclude that, in order for their use to the feasible in terms of a normal depletion time of a smartphone's battery, it is a good advice to maximize the collection of data necessary to be transmitted from nearby sensors, and maximize the intervals between transmissions. More research is required to devise energy efficient transmission methods that enable the use of smartphones as mobile gateways. PMID:25333291

  18. Towards Efficient Mobile M2M Communications: Survey and Open Challenges

    Directory of Open Access Journals (Sweden)

    Carlos Pereira

    2014-10-01

    Full Text Available Machine-to-Machine (M2M communications enable networked devices and services to exchange information and perform actions seamlessly without the need for human intervention. They are viewed as a key enabler of the Internet of Things (IoT and ubiquitous applications, like mobile healthcare, telemetry, or intelligent transport systems. We survey existing work on mobile M2M communications, we identify open challenges that have a direct impact on performance and resource usage efficiency, especially the impact on energy efficiency, and we review techniques to improve communications. We review the ETSI standard and application protocols, and draw considerations on the impact of their use in constrained mobile devices. Nowadays, smartphones are equipped with a wide range of embedded sensors, with varied local and wide area connectivity capabilities, and thus they offer a unique opportunity to serve as mobile gateways for other more constrained devices with local connectivity. At the same time, they can gather context data about users and environment from the embedded sensors. These capabilities may be crucial for mobile M2M applications. Finally, in this paper, we consider a scenario where smartphones are used as gateways that collect and aggregate data from sensors in a cellular network. We conclude that, in order for their use to the feasible in terms of a normal depletion time of a smartphone’s battery, it is a good advice to maximize the collection of data necessary to be transmitted from nearby sensors, and maximize the intervals between transmissions. More research is required to devise energy efficient transmission methods that enable the use of smartphones as mobile gateways.

  19. Towards efficient mobile M2M communications: survey and open challenges.

    Science.gov (United States)

    Pereira, Carlos; Aguiar, Ana

    2014-10-20

    Machine-to-Machine (M2M) communications enable networked devices and services to exchange information and perform actions seamlessly without the need for human intervention. They are viewed as a key enabler of the Internet of Things (IoT) and ubiquitous applications, like mobile healthcare, telemetry, or intelligent transport systems. We survey existing work on mobile M2M communications, we identify open challenges that have a direct impact on performance and resource usage efficiency, especially the impact on energy efficiency, and we review techniques to improve communications. We review the ETSI standard and application protocols, and draw considerations on the impact of their use in constrained mobile devices. Nowadays, smartphones are equipped with a wide range of embedded sensors, with varied local and wide area connectivity capabilities, and thus they offer a unique opportunity to serve as mobile gateways for other more constrained devices with local connectivity. At the same time, they can gather context data about users and environment from the embedded sensors. These capabilities may be crucial for mobile M2M applications. Finally, in this paper, we consider a scenario where smartphones are used as gateways that collect and aggregate data from sensors in a cellular network. We conclude that, in order for their use to the feasible in terms of a normal depletion time of a smartphone's battery, it is a good advice to maximize the collection of data necessary to be transmitted from nearby sensors, and maximize the intervals between transmissions. More research is required to devise energy efficient transmission methods that enable the use of smartphones as mobile gateways.

  20. Voice over IP: how computing technology is being used in mobile communications.

    Science.gov (United States)

    Johnson, William

    2005-01-01

    This article explains how computing technology was used to address the need for mobile communications among nursing staff. In 2004, nursing staff at Fauquier Hospital relocated from one nursing floor in an older building to two floors in a new structure. This resulted in complaints and supervision issues as nursing managers, who had previously been relatively sedentary, now became quite mobile as they attempted to control nursing operations on two separate floors. Complaints arose from several sources. Nursing staff and managers both complained about the increased difficulty in communicating with each other Physicians expressed frustration to hospital administration at playing "telephone tag" with managers. The solution involved Internet Protocol technology that is in widespread use on most computer networks. The article details how this technology was selected over several other communications technologies and used to implement wireless telephony over the hospital's existing computer network. It reviews key standards and technologies and issues surrounding their use. Finally, the article demonstrates how this computing technology improved patient care by facilitating mobile communications.

  1. Purpose-restricted Anonymous Mobile Communications Using Anonymous Signatures in Online Credential Systems

    DEFF Research Database (Denmark)

    Fathi, Hanane; Shin, SeongHan; Kobara, Kazukuni

    2010-01-01

    To avoid the risk of long-term storage of secrets on a portable device, an online credential system supports the roaming user in retrieving securely at various locations his private key and other material to generate anonymous signatures. The protocol proposed here allows a roaming mobile user...... to access anonymously services such as whistle blowing and net-counselling. Our approach: (1) allows a mobile user, remembering a short password, to anonymously and securely retrieve the credentials necessary for his anonymous communication without assuming a pre-established anonymous channel...

  2. On the Benefits of Cognitive Infocommunication for Mobile Communication Nodes Using Cooperative Concepts

    DEFF Research Database (Denmark)

    Blázovics, László; Forstner, Bertalan; Charaf, Hassan

    2013-01-01

    The distributed coordination of a group of mobile robots became a widely studied area in the last decades however the communication aided solutions became also popular research. In this paper we present the concept of cognitive swarm which enables to design faster and reliable cooperative groups...... by the use of cognitive infocommunication. We demonstrate the benefits of our new concept by a scenario in which a swarm of mobile robots had to guard a given area by intercepting eventual intruders. Therefore we introduce the area surveillance problem and we give both a baseline and a cognitive...

  3. Electronic data capture platform for clinical research based on mobile phones and near field communication technology.

    Science.gov (United States)

    Morak, Jürgen; Schwetz, Verena; Hayn, Dieter; Fruhwald, Friedrich; Schreier, Gunter

    2008-01-01

    Electronic data capture systems support data acquisition for clinical research and enable the evaluation of new investigational medical devices. In case of evaluating a device the most challenging part is the user interface i.e. the solution how to acquire the data within a clinical setting and to synchronize them with a web-based data centre. The aim of this paper is to describe the development of an electronic data capture system with a mobile data input solution based on mobile phones and Near Field Communication technology. This system was evaluated within a real clinical setting and demonstrated high usability, security and reliability.

  4. A Mobility and Traffic Generation Framework for Modeling and Simulating Ad Hoc Communication Networks

    Directory of Open Access Journals (Sweden)

    Chris Barrett

    2004-01-01

    Full Text Available We present a generic mobility and traffic generation framework that can be incorporated into a tool for modeling and simulating large scale ad~hoc networks. Three components of this framework, namely a mobility data generator (MDG, a graph structure generator (GSG and an occlusion modification tool (OMT allow a variety of mobility models to be incorporated into the tool. The MDG module generates positions of transceivers at specified time instants. The GSG module constructs the graph corresponding to the ad hoc network from the mobility data provided by MDG. The OMT module modifies the connectivity of the graph produced by GSG to allow for occlusion effects. With two other modules, namely an activity data generator (ADG which generates packet transmission activities for transceivers and a packet activity simulator (PAS which simulates the movement and interaction of packets among the transceivers, the framework allows the modeling and simulation of ad hoc communication networks. The design of the framework allows a user to incorporate various realistic parameters crucial in the simulation. We illustrate the utility of our framework through a comparative study of three mobility models. Two of these are synthetic models (random waypoint and exponentially correlated mobility proposed in the literature. The third model is based on an urban population mobility modeling tool (TRANSIMS developed at the Los Alamos National Laboratory. This tool is capable of providing comprehensive information about the demographics, mobility and interactions of members of a large urban population. A comparison of these models is carried out by computing a variety of parameters associated with the graph structures generated by the models. There has recently been interest in the structural properties of graphs that arise in real world systems. We examine two aspects of this for the graphs created by the mobility models: change associated with power control (range of

  5. Performance Analysis of Mobile Ad Hoc Unmanned Aerial Vehicle Communication Networks with Directional Antennas

    Directory of Open Access Journals (Sweden)

    Abdel Ilah Alshbatat

    2010-01-01

    Full Text Available Unmanned aerial vehicles (UAVs have the potential of creating an ad hoc communication network in the air. Most UAVs used in communication networks are equipped with wireless transceivers using omnidirectional antennas. In this paper, we consider a collection of UAVs that communicate through wireless links as a mobile ad-hoc network using directional antennas. The network design goal is to maximize the throughput and minimize the end-to-end delay. In this respect, we propose a new medium access control protocol for a network of UAVs with directional antennas. We analyze the communication channel between the UAVs and the effect of aircraft attitude on the network performance. Using the optimized network engineering tool (OPNET, we compare our protocol with the IEEE 802.11 protocol for omnidirectional antennas. The simulation results show performance improvement in end-to-end delay as well as throughput.

  6. A Reusable Component for Communication and Data Synchronization in Mobile Distributed Interactive Applications

    CERN Document Server

    Khan, Abdul Malik; Beugnard, Antoine; 10.4204/EPTCS.37.7

    2010-01-01

    In Distributed Interactive Applications (DIA) such as multiplayer games, where many participants are involved in a same game session and communicate through a network, they may have an inconsistent view of the virtual world because of the communication delays across the network. This issue becomes even more challenging when communicating through a cellular network while executing the DIA client on a mobile terminal. Consistency maintenance algorithms may be used to obtain a uniform view of the virtual world. These algorithms are very complex and hard to program and therefore, the implementation and the future evolution of the application logic code become difficult. To solve this problem, we propose an approach where the consistency concerns are handled separately by a distributed component called a Synchronization Medium, which is responsible for the communication management as well as the consistency maintenance. We present the detailed architecture of the Synchronization Medium and the generic interfaces i...

  7. Maintaining communication link based on AODV routing protocol in mobile robot networks

    Science.gov (United States)

    Hu, Hui; Jiang, Hong

    2007-12-01

    Wired computer networks are vital in modern life. However, these networks are extremely vulnerable to disaster or attack in emergency situations. Therefore, how to maintain communication link under emergency situations is very important. In this paper, we utilize a series of autonomous mobile slave robots which follow behind the lead robot and automatically stop where needed to maintain an ad hoc network for guaranteeing a link between the lead robot and its remote monitor/control station. To accomplish this target, an efficient communication protocol limitation mobile robots broadcast based on AODV (LMRB-AODV) is proposed for deployment in multi-robot system. After then the lead robot could carry service traffics to the monitor station under emergency situations through the communication link. At any instance, the lead robot has the ability to reclaim the relay robot(s) which are unneeded in the network to rejoin the convoy behind the lead robot and use it to extend the range of wireless communication when the radio frequency (RF) shortcuts are detected by the lead robot. All relay deployment and reclaiming strategy functions occur without the operator's involvement. Finally, we provide a comparative study of their performance in a number of different simulation environments. The results show that the proposed scheme is very efficient in maintaining communication link in wireless network.

  8. Flexible Data Dissemination Strategy For Effective Cache Consistency In Mobile Wireless Communication Networks

    Directory of Open Access Journals (Sweden)

    Kahkashan Tabassum

    2012-06-01

    Full Text Available In mobile wireless communication network, caching data items at the mobile clients is important to reduce the data access delay. However, efficient cache invalidation strategies are used to ensure the consistency between the data in the cache of mobile clients and at the database server. Servers use invalidation reports (IRs to inform the mobile clients about data item updates. This paper proposes and implements a multicast based strategy to maintain cache consistency in mobile environment using AVI as the cache invalidationscheme. The proposed algorithm is outlined as follows – To resolve a query, the mobile client searches its cache to check if its data is valid. If yes, then query is answered, otherwise the client queries the DTA (Dynamic Transmitting Agent for latest updates and the query is answered. If DTA doesn’t have the latest updates, it gets it from the server. So, the main idea here is that DTA will be multicasting updates to the clients and hence the clients need not uplink to the server individually, thus preserving the network bandwidth. The scenario of simulation is developed in Java. The results demonstrate that the traffic generated in the proposed multicast model is simplified and it also retains cache consistency when compared to the existing methods that used broadcast strategy.

  9. PoliticAPP: Towards a Categorization of Mobile Apps in Political Communication

    Directory of Open Access Journals (Sweden)

    Pablo VÁZQUEZ SANDE

    2016-06-01

    Full Text Available This article is an analyze of all mobile apps that are available in the field of Spanish political communication, with the aim to develop a pioneering categorization of these platforms according to various criteria as promoters, aims pursued or areas of performance. It includes also a critical review from which it is concluded that these app reproduce classic communication patterns with the voters. That means that the implementation of these channels seems to have been due more to political marketing than to boost democratic participation or to introduce an horizontal outline of a new relationship between politicians and citizens.

  10. A Mobile Communications Space Link Between the Space Shuttle Orbiter and the Advanced Communications Technology Satellite

    Science.gov (United States)

    Fink, Patrick; Arndt, G. D.; Bondyopadhyay, P.; Shaw, Roland

    1994-01-01

    A communications experiment is described as a link between the Space Shuttle Orbiter (SSO) and the Advanced Communications Technology Satellite (ACTS). Breadboarding for this experiment has led to two items with potential for commercial application: a 1-Watt Ka-band amplifier and a Ka-band, circularly polarized microstrip antenna. Results of the hybrid Ka-band amplifier show gain at 30 dB and a saturated output power of 28.5 dBm. A second version comprised of MMIC amplifiers is discussed. Test results of the microstrip antenna subarray show a gain of approximately 13 dB and excellent circular polarization.

  11. AN EFFICIENT QoS-CONSTRAINED RESOURCE ALLOCATION STRATEGY FOR MULTI-CARRIER MOBILE COMMUNICATION SYSTEMS

    Directory of Open Access Journals (Sweden)

    Srinivas Karedla

    2016-03-01

    Full Text Available Resource allocation strategies in Mobile Communication Systems (4G/5G are proposed to enhance the data transmission and to meet the required QoS of the users by reducing the interference (inter/intra cell. The aim of this paper is to propose an efficient QoS-Constrained resource allocation strategy called QoS-Constrained Modified Load Matrix (QoS-MLM for Multi -Carrier Mobile Communication systems under 4G LTE scenario to reduce interference and to improve aggregate throughput, packet delay. Simulation results show that by using QoS-MLM the aggregate throughput and packet delay has improved significantly when compared to benchmark schedulers.

  12. Multi-Layer 5G Mobile Phone Antenna for Multi-User MIMO Communications

    DEFF Research Database (Denmark)

    Ojaroudiparchin, Naser; Shen, Ming; Pedersen, Gert F.

    2015-01-01

    for 5G wireless communications. Two identical linear sub arrays can be simultaneously used at different sides of the mobile-phone printed circuit board (PCB) for operation in diversity or multiple-input multiple-output (MIMO) modes. Each sub array contains eight elements of very compact off......-center dipole antennas with dimensions of 5.4×0.67 mm2. The feature of compact design with good beam-steering function makes them well-suited to integrate into the mobile-phone mock-up. The fundamental properties of the proposed antenna have been investigated. Simulations show that the proposed 5G antenna...... is effective for the required beam-coverage in multi-user MIMO communications....

  13. Survey on Simulation for Mobile Ad-Hoc Communication for Disaster Scenarios

    Institute of Scientific and Technical Information of China (English)

    Erika Rosas; Nicolas Hidalgo; Veronica Gil-Costa; Carolina Bonacic; Mauricio Marin; Hermes Senger; Luciana Arantes; Cesar Marcondes; Olivier Marin

    2016-01-01

    Mobile ad-hoc communication is a demonstrated solution to mitigate the impact of infrastructure failures during large-scale disasters. A very complex issue in this domain is the design validation of software applications that support decision-making and communication during natural disasters. Such disasters are irreproducible, highly unpredictable, and impossible to scale down, and thus extensive assessments cannot be led in situ. In this context, simulation constitutes the best approach towards the testing of software solutions for natural disaster responses. The present survey reviews mobility models, ad-hoc network architectures, routing protocols and network simulators. Our aim is to provide guidelines for software developers with regards to the performance evaluation of their applications by means of simulation.

  14. Global mobile satellite communications theory for maritime, land and aeronautical applications

    CERN Document Server

    Ilčev, Stojče Dimov

    2017-01-01

    This book discusses current theory regarding global mobile satellite communications (GMSC) for maritime, land (road and rail), and aeronautical applications. It covers how these can enable connections between moving objects such as ships, road and rail vehicles and aircrafts on one hand, and on the other ground telecommunications subscribers through the medium of communications satellites, ground earth stations, Terrestrial Telecommunication Networks (TTN), Internet Service Providers (ISP) and other wireless and landline telecommunications providers. This new edition covers new developments and initiatives that have resulted in land and aeronautical applications and the introduction of new satellite constellations in non-geostationary orbits and projects of new hybrid satellite constellations. The book presents current GMSC trends, mobile system concepts and network architecture using a simple mode of style with understandable technical information, characteristics, graphics, illustrations and mathematics equ...

  15. Decentralized energy aware co-optimization of mobility and communication in multiagent systems

    KAUST Repository

    Jaleel, Hassan

    2017-01-05

    Our goal is to design decentralized coordination strategies that enable agents to achieve global performance guarantees while minimizing the energy cost of their actions with an emphasis on feasibility for real-time implementation. As a motivating scenario that illustrates the importance of introducing energy awareness at the agent level, we consider a team of mobile nodes that are assigned the task of establishing a communication link between two base stations with minimum energy consumption. We formulate this problem as a dynamic program in which the total cost of each agent is the sum of both mobility and communication costs. To ensure that the solution is decentralized and real time implementable, we propose multiple suboptimal policies based on the concepts of approximate dynamic programming. To provide performance guarantees, we compute upper bounds on the performance gap between the proposed suboptimal policies and the global optimal policy. Finally, we discuss merits and demerits of the proposed policies and compare their performance using simulations.

  16. Hardware implementation of pi/4-DQPSK modem for mobile communication (Short Communication

    Directory of Open Access Journals (Sweden)

    K.P.M. Bhat

    2001-07-01

    Full Text Available Spectrally efficient digital modulation schemes for land mobile voice transmission applications highlighting advantages of a 7Pi/4-DQPSK modem are briefly reviewed, A procedure to generate 7Pi/4-DQPSK signal by directly mapping pairs of input bits through dibit transformation function and analog multiplexer is described. Details of modulator hardware for a standard data rate of 48 kbps are also incorporated, A promising all-digital receiver structure which lends itself for miniaturisation, is described.

  17. A maintenance scheme of communication link in mobile robot ad hoc networks based on potential field

    Science.gov (United States)

    Jiang, Hong; Jin, WenPing; Yang, GyoYing; Li, LeiMin

    2007-12-01

    Maintaining communication link in mobile robot networks between task robots and a control center is very important in some urgent application occasions such as remote danger detections. To offer a reliable multi-hop communication link, a link maintaining scheme based on artificial potential field is presented. The scheme is achieved by a task robot and communication relay ones. The task robot performs predefined tasks, and relay ones are simple robots which form a communication relay chain. When robots move towards destination in formation, a kind of attractive force created by communication quality is added to traditional potential field, and relay robots follow the task robot and automatically stop at adequate locations to form a relay chain from the control station to the task robot. In order to increase relay usage efficiency, when some relays are replaced by other short cut relays, the redundant relays can be reused by initiating another moving toward specified location. Simulation results show that the scheme can provide a reliable multi-hop communication link, and that the communication connection can be obtained through minimal number of relays.

  18. Using a Communication Model to Collect Measurement Data through Mobile Devices

    OpenAIRE

    Gabriel Urzaiz; Ramón Hervás; Vladimir Villarreal; José Bravo

    2012-01-01

    Wireless systems and services have undergone remarkable development since the first mobile phone system was introduced in the early 1980s. The use of sensors in an Ambient Intelligence approach is a great solution in a medical environment. We define a communication architecture to facilitate the information transfer between all connected devices. This model is based in layers to allow the collection of measurement data to be used in our framework monitoring architecture. An overlay-based solu...

  19. Prototyping FBMC/OQAM for 5G mobile communications proof of concept

    OpenAIRE

    Arteaga Martinez, Xavier

    2015-01-01

    [ANGLÈS] Nowadays, the number of wireless devices connected to the internet is rowing quite fast. However, the available spectrum will remain the same. Consequently, the next generation of mobile communications (5G) is driven by more spectral efficient waveforms. There are a number of candidate waveforms for 5G. One of them is the Filter Bank Multi-Carrier (FBMC) with Offset Quadrature Amplitude Modulation (OQAM) which is a variant of the current Orthogonal Frequency Division Multiplex (OFDM)...

  20. MQoL: Experiences of the 'mobile communications and computing for Quality of Life' Living Lab

    DEFF Research Database (Denmark)

    Wac, Katarzyna; Gustarini, Mattia; Marchanoff, Jerome;

    2016-01-01

    Widespread acceptance and use of personalized mobile devices facilitates the provision of the ubiquitous mobile communications and computing applications that enable the human Quality of Life (QoL) improvement. However, there are multiple human factors influencing these applications, stemming fro...... to improve this individual's QoL. This paper also explains the methodological aspects of our research, including transdisciplinarity aspects, and delineates the research challenges for a Living Lab approach at large....... their users' needs, expectations, and ways of maximizing their experience and the impact on their QoL. For a successful adoption of these applications, our mobile technologies lab, mQoL, employs an iterative, user-centric, Living Lab approach for the applications' design and evaluation. This paper introduces...

  1. R&D on wireless broadband communication systems: new generation ubiquitous mobile network

    Science.gov (United States)

    Ogawa, Hiroyo

    2007-09-01

    R&D on new generation mobile network has attracted a growing interest over the world on the background of rapid market growth for 2nd and 3rd - generation cellular networks and wireless LANs/MANs. The National Institute of Information and Communications Technology (NICT) has been carried out the New Generation Mobile Network Project from April 2002 to March 2006, and has developed fundamental technologies to enable seamless and secure integration of various wireless access networks such as existing cellular networks, wireless LANs, home networks, intelligent transport systems (ITS), the Beyond-3G (B3G) cellular and other wireless access systems. From April 2006, Ubiquitous Mobile Network project focused on cognitive radio technology and integrated seamless networking technology was started. This paper overviews the achievement and the future plan of these projects.

  2. Gender Differences in Communication Behaviors, Spatial Proximity Patterns, and Mobility Habits

    CERN Document Server

    Yang, Yang; Wang, Dong; Dong, Yuxiao; Striegel, Aaron D; Hachen, David; Chawla, Nitesh V

    2016-01-01

    The existence of gender differences in the structure and composition of social networks is a well established finding in the social and behavioral sciences, but researchers continue to debate whether structural, dispositional, or life course factors are the primary driver of these differences. In this paper we extend work on gender differences in social networks to patterns of interaction, propinquity, and connectivity captured via a social sensing platform comprised of an ensemble of individuals' phone calls, text messaging, face-to-face interactions, and traces of their mobility activities. We attempt to isolate dispositional from other factors by focusing on a relatively homogeneous population on a relatively closed setting at the same stage in the life course. Analysis across three different networks along with mobility data reveals systematic gender differences in terms of communicative, distributional, mobility, and spatial proximity tendencies. Most importantly, some patterns observed in the communicat...

  3. Mobile phones as a health communication tool to improve skilled attendance at delivery in Zanzibar

    DEFF Research Database (Denmark)

    Lund, S; Hemed, M; Nielsen, Birgitte Bruun

    2012-01-01

    Please cite this paper as: Lund S, Hemed M, Nielsen B, Said A, Said K, Makungu M, Rasch V. Mobile phones as a health communication tool to improve skilled attendance at delivery in Zanzibar: a cluster-randomised controlled trial. BJOG 2012; DOI: 10.1111/j.1471-0528.2012.03413.x. Objective......  To examine the association between a mobile phone intervention and skilled delivery attendance in a resource-limited setting. Design  Pragmatic cluster-randomised controlled trial with primary healthcare facilities as the unit of randomisation. Setting  Primary healthcare facilities in Zanzibar. Population...... component. Main outcome measures  Skilled delivery attendance. Results  The mobile phone intervention was associated with an increase in skilled delivery attendance: 60% of the women in the intervention group versus 47% in the control group delivered with skilled attendance. The intervention produced...

  4. Satellite-aided mobile communications limited operational test in the trucking industry

    Science.gov (United States)

    Anderson, R. E.; Frey, R. L.; Lewis, J. R.

    1980-01-01

    An experiment with NASA's ATS-6 satellite, that demonstrates the practicality of satellite-aided land mobile communications is described. Satellite communications equipment for the experiment was designed so that it would be no more expensive, when mass produced, than conventional two-way mobile radio equipment. It embodied the operational features and convenience of present day mobile radios. Vehicle antennas 75 cm tall and 2 cm in diameter provided good commercial quality signals to and from trucks and jeeps. Operational applicability and usage data were gathered by installing the radio equipment in five long-haul tractor-trailer trucks and two Air Force search and rescue jeeps. Channel occupancy rates are reported. Air Force personnel found the satellite radio system extremely valuable in their search and rescue mission during maneuvers and actual rescue operations. Propagation data is subjectively analyzed and over 4 hours of random data is categorized and graded as to signal quality on a second by second basis. Trends in different topographic regions are reported. An overall communications reliability of 93% was observed despite low satellite elevation angles ranging from 9 to 24 degrees.

  5. Review of mobile communication devices as potential reservoirs of nosocomial pathogens.

    Science.gov (United States)

    Brady, R R W; Verran, J; Damani, N N; Gibb, A P

    2009-04-01

    Innovation in mobile communication technology has provided novel approaches to the delivery of healthcare and improvements in the speed and quality of routine medical communication. Bacterial contamination of mobile communication devices (MCDs) could be an important issue affecting the implementation of effective infection control measures and might have an impact on efforts to reduce cross-contamination. This review examines recent studies reporting bacterial contamination of MCDs, most demonstrating that 9-25% of MCDs are contaminated with pathogenic bacteria. We examine previously investigated risk factors for MCD contamination in addition to work on surface decontamination of the device. Recommendations to reduce contamination risks include staff education, strict hand hygiene measures, guidelines on device cleaning and consideration of the restrictions regarding use of mobile phone technology in certain high risk areas, for example, operating theatres, intensive care units and burns units. Further work is required to evaluate the benefit of such interventions on MCD contamination and to determine whether a link exists between contamination and subsequent patient infection.

  6. Efficient Cluster Based Multicast Tree for Secure Multicast Communication for Mobile Ad Hoc Networks

    Directory of Open Access Journals (Sweden)

    D.Suganya Devi

    2010-05-01

    Full Text Available Secure multicast communication in mobile adhoc networks is challenging due to its inherent characteristics of infrastructure-less architecture with lack of central authority, limited resources such as bandwidth, time and power. Hence key management is the fundamental challenge in achieving secure communication using multicast key distribution in mobile adhoc networks. In many multicast interactions, due to its frequent node mobility, new member can join and current members can leave at a time due to node failure which causes delay in multicast transmission. This paper proposes a new efficient cluster based multicast tree (CBMT algorithm for secure multicast Communication, in which source node uses Multicast version of Destination Sequenced Distance Vector(MDSDV routing protocol to collects its 1 hop neighbors to form cluster and each node which have child node is elected as the Local controllers of the created clusters. It also tolerates the faults that causes due to failure of nodes. Simulation results shows the demonstration of CBMT using MDSDV have better system performance in terms of end to end delay and fault tolerance rate under varying network conditions.

  7. An integrated Ka/Ku-band payload for personal, mobile and private business communications

    Science.gov (United States)

    Hayes, Edward J.; Keelty, J. Malcolm

    1991-01-01

    The Canadian Department of Communications has been studying options for a government-sponsored demonstration payload to be launched before the end of the century. A summary of the proposed system concepts and network architectures for providing an advanced private business network service at Ku-band and personal and mobile communications at Ka-band is presented. The system aspects addressed include coverage patterns, traffic capacity, and grade of service, multiple access options as well as special problems, such as Doppler in mobile applications. Earth terminal types and the advanced payload concept proposed in a feasibility study for the demonstration mission are described. This concept is a combined Ka-band/Ku-band payload which incorporates a number of advanced satellite technologies including a group demodulator to convert single-channel-per-carrier frequency division multiple access uplink signals to a time division multiplex downlink, on-board signal regeneration, and baseband switching to support packet switched data operation. The on-board processing capability of the payload provides a hubless VSAT architecture which permits single-hop full mesh interconnectivity. The Ka-band and Ku-band portions of the payload are fully integrated through an on-board switch, thereby providing the capability for fully integrated services, such as using the Ku-band VSAT terminals as gateway stations for the Ka-band personal and mobile communications services.

  8. Method for Evaluation of Outage Probability on Random Access Channel in Mobile Communication Systems

    Science.gov (United States)

    Kollár, Martin

    2012-05-01

    In order to access the cell in all mobile communication technologies a so called random-access procedure is used. For example in GSM this is represented by sending the CHANNEL REQUEST message from Mobile Station (MS) to Base Transceiver Station (BTS) which is consequently forwarded as an CHANNEL REQUIRED message to the Base Station Controller (BSC). If the BTS decodes some noise on the Random Access Channel (RACH) as random access by mistake (so- called ‘phantom RACH') then it is a question of pure coincidence which èstablishment cause’ the BTS thinks to have recognized. A typical invalid channel access request or phantom RACH is characterized by an IMMEDIATE ASSIGNMENT procedure (assignment of an SDCCH or TCH) which is not followed by sending an ESTABLISH INDICATION from MS to BTS. In this paper a mathematical model for evaluation of the Power RACH Busy Threshold (RACHBT) in order to guaranty in advance determined outage probability on RACH is described and discussed as well. It focuses on Global System for Mobile Communications (GSM) however the obtained results can be generalized on remaining mobile technologies (ie WCDMA and LTE).

  9. Communicating textual health information to the mobile phones of visually-impaired users.

    Science.gov (United States)

    Kummervold, Per Egil; Holthe, Halgeir

    2008-01-01

    We investigated how short messages communicating health information would best be distributed to people with vision difficulties using mobile phones. Twelve visually-impaired persons who were unable to read short message service (SMS) messages directly compared three methods of presenting text messages as speech: (1) ordinary SMS messages were sent to the users and converted into speech by the mobile phone; (2) multimedia messages were sent to the users with prerecorded speech-synthesized information; and (3) mobile phone calls were placed to the users and prerecorded speech-synthesized messages were streamed to them. The latter two approaches used server-generated sound files. Over a three-month trial period, we sent a total of 88 SMS messages to the subjects, 111 multimedia messaging service (MMS) messages and 104 telephone calls. All of the SMS messages, 88% of the MMS messages and 69% of the telephone calls were received. In subsequent interviews, we asked the users which presentation method they preferred. SMS scored significantly better than both MMS (P = 0.033) and telephones (P = 0.006). All three methods had serious drawbacks. However, the study suggests that it might be possible to develop suitable technology for communicating with people with vision difficulties by mobile phone.

  10. A Universal Communication Framework and Navigation Control Software for Mobile Prototyping Platforms

    Directory of Open Access Journals (Sweden)

    Andreas Mitschele-Thiel

    2010-09-01

    Full Text Available In our contribution we would like to describe two new aspects of our low-cost mobile prototyping platform concept: a new hardware communication framework as well as new software features for navigation and control of our mobile platform. The paper is an extension of the ideas proposed in REV2009 [1] and is based on the therein used hardware platform and the monitoring and management software. This platform is based on the Quadrocopter concept – autonomous flying helicopter-style robots – and includes additional off-the-shelf parts. This leads to a universal mobile prototyping platform for communication tasks providing both mobile phone and WiFi access. However, the platform can provide these functions far more quickly than a technician on the ground might be able to. We will show that with our concept we can easily adapt the platform to the individual needs of the user, which leads to a very flexible and semi-autonomous system.

  11. [Monitor of ECG signal and heart rate using a mobile phone with Bluetooth communication protocol].

    Science.gov (United States)

    Becerra-Luna, Brayans; Dávila-García, Rodrigo; Salgado-Rodríguez, Paola; Martínez-Memije, Raúl; Infante-Vázquez, Oscar

    2012-01-01

    To develop a portable signal monitoring equipment for electrocardiography (ECG) and heart rate (HR), communicated with a mobile phone using the Bluetooth (BT) communication protocol for display of the signal on screen. A monitoring system was designed in which the electronic section performs the ECG signal acquisition, as well as amplification, filtering, analog to digital conversion and transmission of the ECG and HR using BT. Two programs were developed for the system. The first one calculates HR through QRS identification and sends the ECG signals and HR to the mobile, and the second program is an application to acquire and display them on the mobile screen. We developed a portable electronic system powered by a 9 volt battery, with amplification and bandwidth meeting the international standards for ECG monitoring. The QRS complex identification was performed using the second derivative algorithm, while the programs allow sending and receiving information from the ECG and HR via BT, and viewing it on the mobile screen. The monitoring is feasible within distances of 15 m and it has been tested in various mobiles telephones of brands Nokia®, Sony Ericsson® and Samsung®. This system shows an alternative for mobile monitoring using BT and Java 2 Micro Edition (J2ME) programming. It allows the register of the ECG trace and HR, and it can be implemented in different phones. Copyright © 2011 Instituto Nacional de Cardiología Ignacio Chávez. Published by Masson Doyma México S.A. All rights reserved.

  12. Investigating the Impact of Personality Factors on Perceived Communication Mobility of Non-Native English Speaking Thai Professionals in International Companies

    Science.gov (United States)

    Marina, Olga A.; Rajprasit, Krich

    2014-01-01

    Communication mobility has been suggested as an element of the complex construct of professional communicative competence, with a shared core of English in the oral mode, for professional international communication. This study aims (1) to investigate the possible correlation between the perceived level of communication mobility, and the influence…

  13. LOOPUS Mob-D: System concept for a public mobile satellite system providing integrated digital services for the Northern Hemisphere from an elliptical orbit

    Science.gov (United States)

    Kuhlen, H.; Horn, P.

    1990-08-01

    A new concept for a satellite based public mobile communications system LOOPUS Mob-D is introduced where most of the 'classical' problems in mobile satellite systems are approached in a different way. The LOOPUS system will offer a total capacity of 6000 high rate channel in three service areas (Europe, Asia, and North America) covering the entire Northern Hemisphere with a set of group special mobile (GSM) compatible mobile services eventually providing the 'office in the car'. Special characteristics of the LOOPUS orbit and the communications network architecture are highlighted.

  14. Effects of Personal Traits on Generation Y Consumers' Attitudes Toward the Use of Mobile Devices for Communication and Commerce

    Directory of Open Access Journals (Sweden)

    Jihyun Kim

    2012-01-01

    Full Text Available The purpose of this study was to investigate the effects of young adult consumers' personal traits (high-tech involvement, experiment proclivity, and fashion/brand leadership on their perceptions of and attitudes toward using mobile devices for communications and commerce. The integrated stimulus-organism-responses paradigm (Fiore & Kim, 2007 served as the overarching framework, combining the uses and gratifications theory (Blumler & Katz, 1974 and the extended technology acceptance model (Kim, Ma, & Park, 2009. A convenience sample of 504 college students in 2 U. S. universities provided usable responses to our survey. Causal modeling analysis results showed that personal trait variables had significant impacts on the perceived ease of use, usefulness, and enjoyment, and attitudes toward mobile communication and mobile commerce. Findings also suggested that three perception variables positively influenced attitudes toward using mobile devices for communication as well as for commerce. This study provides empirical evidence of the potential of mobile commerce among young adult consumers.

  15. A Protocol for Content-Based Communication in Disconnected Mobile Ad Hoc Networks

    Directory of Open Access Journals (Sweden)

    Julien Haillot

    2010-01-01

    Full Text Available In content-based communication, information flows towards interested hosts rather than towards specifically set destinations. This new style of communication perfectly fits the needs of applications dedicated to information sharing, news distribution, service advertisement and discovery, etc. In this paper we address the problem of supporting content-based communication in partially or intermittently connected mobile ad hoc networks (MANETs. The protocol we designed leverages on the concepts of opportunistic networking and delay-tolerant networking in order to account for the absence of end-to-end connectivity in disconnected MANETs. The paper provides an overview of the protocol, as well as simulation results that show how this protocol can perform in realistic conditions.

  16. Temporal motifs reveal homophily, gender-specific patterns and group talk in mobile communication networks

    CERN Document Server

    Kovanen, Lauri; Kertész, János; Saramäki, Jari

    2013-01-01

    Electronic communication records provide detailed information about temporal aspects of human interaction. Previous studies have shown that individuals' communication patterns have complex temporal structure, and that this structure has system-wide effects. In this paper we use mobile phone records to show that interaction patterns involving multiple individuals have non-trivial temporal structure that cannot be deduced from a network presentation where only interaction frequencies are taken into account. We apply a recently introduced method, temporal motifs, to identify interaction patterns in a temporal network where nodes have additional attributes such as gender and age. We then develop a null model that allows identifying differences between various types of nodes so that these differences are independent of the network based on interaction frequencies. We find gender-related differences in communication patters, and show the existence of temporal homophily, the tendency of similar individuals to partic...

  17. Mobile health IT: The effect of user interface and form factor on doctor-patient communication

    DEFF Research Database (Denmark)

    Alsos, Ole Andreas; Das, Anita; Svanæs, Dag

    2012-01-01

    -establishment of eye contact, better verbal and non-verbal contact, more gesturing, good visibility of actions, and quick information retrieval. The digital information devices lacked many of these affordances; physicians’ actions were not visible for the patients, the user interfaces required much attention...... support or hinder aspects of doctor–patient communication, such as face-to-face dialogue, nonverbal communication, and action transparency. Method The study draws on two different experimental simulation studies where 22 doctors, in 80 simulated ward rounds, accessed patient-related information from...... that physicians can use the devices to support face-to-face dialogue, nonverbal communication, and action visibility. The ability to facilitate and support the doctor–patient collaboration is a noteworthy usability factor in the design of mobile EPR systems. The paper also presents possible design guidelines...

  18. Enabling Mobile Communications for the Needy: Affordability Methodology, and Approaches to Requalify Universal Service Measures

    Directory of Open Access Journals (Sweden)

    Louis-Francois PAU

    2009-01-01

    Full Text Available This paper links communications and media usage to social and household economics boundaries. It highlights that in present day society, communications and media are a necessity, but not always affordable, and that they furthermore open up for addictive behaviors which raise additional financial and social risks. A simple and efficient methodology compatible with state-of-the-art social and communications business statistics is developed, which produces the residual communications and media affordability budget and ultimately the value-at-risk in terms of usage and tariffs. Sensitivity analysis provides precious information on bottom-up communications and media adoption on the basis of affordability. This approach differs from the regulated but often ineffective Universal service obligation, which instead of catering for individual needs mostly addresses macro-measures helping geographical access coverage (e.g. in rural areas. It is proposed to requalify the Universal service obligations on operators into concrete measures, allowing, with unchanged funding, the needy to adopt mobile services based on their affordability constraints by bridging the gap to a standard tariff. Case data are surveyed from various countries. ICT policy recommendations are made to support widespread and socially responsible communications access.

  19. 大数据在移动通信中的应用%Big data applications in mobile communication

    Institute of Scientific and Technical Information of China (English)

    黄倩蓉

    2015-01-01

    Under the background of big data technology background, a variety of mobile communication networks sporadic, scattered information effectively integrate fully and dig deeper potential of mobile communications, the development of mobile communications become more service and business platform. Large data applications for mobile communications center, a large data analysis of key technologies used in mobile communications-the big data analysis techniques and large data storage technology, mobile communications applications made big data technology measures and methods.%大数据技术背景下,移动通信网络中各种零星、分散的信息得到有效整合,充分而深入地挖掘移动通信潜力,成为开发移动通信更多服务和业务的平台。以移动通信的大数据应用为中心,分析了大数据应用于移动通信的关键技术———大数据分析技术、大数据存储技术,提出了移动通信领域应用大数据技术的措施与方法。

  20. [Mobile hospital -real time mobile telehealthcare system with ultrasound and CT van using high-speed satellite communication-].

    Science.gov (United States)

    Takizawa, Masaomi; Miyashita, Toyohisa; Murase, Sumio; Kanda, Hirohito; Karaki, Yoshiaki; Yagi, Kazuo; Ohue, Toru

    2003-01-01

    A real-time telescreening system is developed to detect early diseases for rural area residents using two types of mobile vans with a portable satellite station. The system consists of a satellite communication system with 1.5Mbps of the JCSAT-1B satellite, a spiral CT van, an ultrasound imaging van with two video conference system, a DICOM server and a multicast communication unit. The video image and examination image data are transmitted from the van to hospitals and the university simultaneously. Physician in the hospital observes and interprets exam images from the van and watches the video images of the position of ultrasound transducer on screenee in the van. After the observation images, physician explains a results of the examination by the video conference system. Seventy lung CT screening and 203 ultrasound screening were done from March to June 2002. The trial of this real time screening suggested that rural residents are given better healthcare without visit to the hospital. And it will open the gateway to reduce the medical cost and medical divide between city area and rural area.

  1. Unmet Communication and Information Needs for Patients with IBD: Implications for Mobile Health Technology.

    Science.gov (United States)

    Khan, Sameer; Dasrath, Florence; Farghaly, Sara; Otobo, Emamuzo; Riaz, Muhammad Safwan; Rogers, Jason; Castillo, Anabella; Atreja, Ashish

    2016-01-01

    In order to develop an application that addresses the most significant challenges facing IBD patients, this qualitative study explored the major hurdles of living with IBD, the information needs of IBD patients, and how application technology may be used to improve quality of life. 15 IBD patients participated in two focus groups of 120 minutes each. Data collection was achieved by combining focus groups with surveys and direct observation of patients looking at a patient-engaged app (HealthPROMISE) screenshots. The survey elicited information on demographics, health literacy and quality of life through the Short IBD Questionnaire (SIBDQ). The needs of IBD patients center around communication as it relates to both patient information needs and navigating the social impacts of IBD on patients' lives: Communication Challenges regarding Information Needs: Patients cited a doctor-patient communication divide where there is a continued lack of goal setting when discussing treatments and a lack of objectivity in disease control. When objectively compared with the SIBDQ, nearly half of the patients in the focus groups wrongly estimated their IBD control.Communication Challenges regarding Social Impacts of IBD: Patients strongly felt that while IBD disrupts routines, adds significant stress, and contributes to a sense of isolation, the impact of these issues would be significantly alleviated through more conversation and better support.Implication for Mobile Health Solutions: Patients want a tool that improves tracking of symptoms, medication adherence and provides education. Physician feedback to patient input on an application is required for long-term sustainability. IBD patients need mobile health technologies that evaluate disease control and the goals of care. Patients feel an objective assessment of their disease control, goal setting and physician feedback will greatly enhance utilization of all mobile health applications.

  2. Mobile and Traditional Modes of Communication Among Male Latino Farmworkers: Implications for Health Communication and Dissemination.

    Science.gov (United States)

    Sandberg, Joanne C; Spears Johnson, Chaya R; Nguyen, Ha T; Talton, Jennifer W; Quandt, Sara A; Chen, Haiying; Summers, Phillip; Arcury, Thomas A

    2016-06-01

    This analysis describes (1) cell phone and smartphone ownership, (2) continuity of phone numbers, (3) use of specific technologies while inside and outside the U.S., and (4) perceived adequacy of specific formats to receive health research results among Latino farmworkers. Telecommunications questionnaires were administered to 165 and 102 farmworkers in North Carolina in 2012 and 2013, respectively. Univariate and bivariate analyses were completed. Increasing numbers of Latino farmworkers own cell phones and smartphones. Talk and text functions are used frequently. Relatively few farmworkers maintain consistent phone numbers. They prefer to receive study results through low technology formats. Strategies to use cell phones to improve health or to share research findings will face obstacles in this population. Public health officials who identify and implement effective strategies to overcome these barriers may be able to harness mobile technologies to address the needs of Latino farmworkers.

  3. SHOULD I TEXT OR SHOULD I TALK? TRANSFORMATIONS OF COMMUNICATIVE PRACTICES BY MOBILE PHONES

    Directory of Open Access Journals (Sweden)

    Tadej Praprotnik

    2017-01-01

    Full Text Available This article presents contemporary transformations of communicative practices among individuals. Communication is a primary vehicle for establishing and maintaining relationships, so it is of vital importance to understand why we communicate in certain ways. The article firstly presents the global climate of modern relationships, which are conducted by social media platforms. The technological convergence of various devices provides additional support for reinforcing communication and networking. Features offered by new media devices (collaboration, networking are presented, along with current practices, which reflect certain problems at the level of usage. The relationship between society and technology is explored, and the fact that our usage of technologies is a reflection of society’s and individuals’ key understandings and orientations is stressed. In line with these remarks the article interprets modern conceptions of relationships that are becoming mere “connections”. Namely, our communication practices of text messaging and e-mailing are to a certain extent a reflection of contemporary orientations. Individuals may like a company, but nevertheless they like distance too. Our modern “connections” are therefore quite intentional. One of the article’s conclusions is that by using “poor” mobile devices (smartphones enable us to send messages of up to 160 characters we mask/disguise our own unpreparedness to engage in complex and “exhaustive” communication (i.e. face-to-face or phone call conversations. This way our own intentions can be ascribed to “poor” technology. We are not confronted with our own intention to be connected, but still at a distance. Additionally, the article also stresses other contextual factors for communication practices, from technological constraints to communicative norms. Nevertheless the usage of technologies is at our command and it reflects the type of relationships we are looking for.

  4. 智能终端撬动下的移动宽带通信市场%Mobile Broadband Communication Market Driving by Smart Mobile Terminal

    Institute of Scientific and Technical Information of China (English)

    王泳江

    2013-01-01

      在介绍移动通信市场变化的基础上,阐述了移动通信产业面临的挑战,最后从运营商转型、后台支撑系统、Smal Cal、多网融合、移动支付等方面阐述了移动宽带发展中的机遇。%Based on the change of mobile communication market, it expounds the chal enges before mobile communication industry. Fi-nal y it discusses the opportunities in the mobile broadband development from the aspects of operator transformation, BSS, smal cal , multi-network convergence and mobile paid.

  5. Interference Robust Transmission for the Downlink of an OFDM-Based Mobile Communications System

    Directory of Open Access Journals (Sweden)

    Markus Konrad

    2008-01-01

    Full Text Available Radio networks for future mobile communications systems, for example, 3GPP Long-Term Evolution (LTE, are likely to use an orthogonal frequency division multiplexing- (OFDM- based air interface in the downlink with a frequency reuse factor of one to avoid frequency planning. Therefore, system capacity is limited by interference, which is particularly crucial for mobile terminals with a single receive antenna. Nevertheless, next generation mobile communications systems aim at increasing downlink throughput. In this paper, a single antenna interference cancellation (SAIC algorithm is introduced for amplitude-shift keying (ASK modulation schemes in combination with bit-interleaved coded OFDM. By using such a transmission strategy, high gains in comparison to a conventional OFDM transmission with quadrature amplitude modulation (QAM can be achieved. The superior performance of the novel scheme is confirmed by an analytical bit-error probability (BEP analysis of the SAIC receiver for a single interferer, Rayleigh fading, and uncoded transmission. For the practically more relevant multiple interferer case we present an adaptive least-mean-square (LMS and an adaptive recursive least-squares (RLS SAIC algorithm. We show that in particular the RLS approach enables a good tradeoff between performance and complexity and is robust even to multiple interferers.

  6. Dynamic Resource Reservation and Connectivity Tracking to Support Real-Time Communication among Mobile Units

    Directory of Open Access Journals (Sweden)

    Almeida Luis

    2005-01-01

    Full Text Available Wireless communication technology is spreading quickly in almost all the information technology areas as a consequence of a gradual enhancement in quality and security of the communication, together with a decrease in the related costs. This facilitates the development of relatively low-cost teams of autonomous (robotic mobile units that cooperate to achieve a common goal. Providing real-time communication among the team units is highly desirable for guaranteeing a predictable behavior in those applications in which the robots have to operate autonomously in unstructured environments. This paper proposes a MAC protocol for wireless communication that supports dynamic resource reservation and topology management for relatively small networks of cooperative units (10–20 units. The protocol uses a slotted time-triggered medium access transmission control that is collision-free, even in the presence of hidden nodes. The transmissions are scheduled according to the earliest deadline first scheduling policy. An adequate admission control guarantees the timing constraints of the team communication requirements, including when new nodes dynamically join or leave the team. The paper describes the protocol focusing on the consensus procedure that supports coherent changes in the global system. We also introduce a distributed connectivity tracking mechanism that is used to detect network partition and absent or crashed nodes. Finally, a set of simulation results are shown that illustrate the effectiveness of the proposed approaches.

  7. 5G: Vision and Requirements for Mobile Communication System towards Year 2020

    Directory of Open Access Journals (Sweden)

    Guangyi Liu

    2016-01-01

    Full Text Available The forecast for future 10 years’ traffic demand shows an increase in 1000 scales and more than 100 billion connections of Internet of Things, which imposes a big challenge for future mobile communication technology beyond year 2020. The mobile industry is struggling in the challenges of high capacity demand but low cost for future mobile network when it starts to enable a connected mobile world. 5G is targeted to shed light on these contradictory demands towards year 2020. This paper firstly forecasts the vision of mobile communication’s application in the daily life of the society and then figures out the traffic trends and demands for next 10 years from the Mobile Broadband (MBB service and Internet of Things (IoT perspective, respectively. The requirements from the specific service and user demands are analyzed, and the specific requirements from typical usage scenarios are calculated by the defined performance indicators. To achieve the target of affordable 5G service, the requirements from network deployment and operation perspective are also captured. Finally, the capabilities and the efficiency requirements of the 5G system are demonstrated as a flower. To realize the vision of 5G, “information a finger away, everything in touch,” 5G will provide the fiber-like access data rate, “zero” latency user experience, and connecting to more than 100 billion devices and deliver a consistent experience across a variety of scenarios with the improved energy and cost efficiency by over a hundred of times.

  8. Integrated base stations and a method of transmitting data units in a communications system for mobile devices

    NARCIS (Netherlands)

    Bosch, H.G.P.; Mullender, Sape J.; Narlikar, G.J.; Samuel, L.G.; Yagati, L.N.

    2006-01-01

    Integrated base stations and a method of transmitting data units in a communications system for mobile devices. In one embodiment, an integrated base station includes a communications processor having a protocol stack configured with a media access control layer and a physical layer.

  9. Communication Modeling and Mobile Object Monitoring by Using Colored Petri Nets

    Directory of Open Access Journals (Sweden)

    Dalė Dzemydienė

    2013-08-01

    Full Text Available Monitoring moving objects and analyzing their statuses are the best opportunities currently offered by mobile technology. The methods and software for wireless systems allow the exchange of many possible data formats (e.g., text, visual or audio communication and provide information about the state of the object’s geographical coordinates in real time. The necessary information is received from the sensors and mobile device’s contextual information. Information is sent to remote servers whenever applicable, and, after some calculation, more accurate data is obtained. Software to identify different situations has been designed and implemented. The software and therefore the identification of the situations of technical equipment can send data, warnings or reminders to a given situation. Colored Petri nets (CPN allowed to more precisely model complex situations of scenarios and to capture the information any time, anywhere provided in advance of a moving object. Mobile devices detect the necessary data via the external or internal physical environment through sensors. The mobile device components are interacting with internal or external physical environment and have the sensor detectors’ parameters. Such information is stored into data-warehouses in which the knowledge discovery is made by CPN models, which represent rules of analysis.

  10. Communication Modeling and Mobile Object Monitoring by Using Colored Petri Nets

    Directory of Open Access Journals (Sweden)

    Ramunas Dzindzalieta

    2011-08-01

    Full Text Available Summary. Monitoring moving objects and analyzing their statuses are the best opportunities currently offered by mobile technology. The methods and software for wireless systems allow the exchange of many possible data formats (e.g., text, visual or audio communication and provide information about the state of the object’s geographical coordinates in real time. The necessary information is received from the sensors and mobile device’s contextual information. Information is sent to remote servers whenever applicable, and, after some calculation, more accurate data is obtained. Software to identify different situations has been designed and implemented. The software and therefore the identification of the situations of technical equipment can send data, warnings or reminders to a given situation. Colored Petri nets (CPN allowed to more precisely model complex situations of scenarios and to capture the information any time, anywhere provided in advance of a moving object. Mobile devices detect the necessary data via the external or internal physical environment through sensors. The mobile device components are interacting with internal or external physical environment and have the sensor detectors’ parameters. Such information is stored into data-warehouses in which the knowledge discovery is made by CPN models, which represent rules of analysis.

  11. Interference Analysis Status and Plans for Aeronautical Mobile Airport Communications System (AeroMACS)

    Science.gov (United States)

    Kerczewski, Robert J.; Wilson, Jeffrey D.

    2010-01-01

    Interference issues related to the operation of an aeronautical mobile airport communications system (AeroMACS) in the C-Band (specifically 5091-5150 MHz) is being investigated. The issue of primary interest is co-channel interference from AeroMACS into mobile-satellite system (MSS) feeder uplinks. The effort is focusing on establishing practical limits on AeroMACS transmissions from airports so that the threshold of interference into MSS is not exceeded. The analyses are being performed with the software package Visualyse Professional, developed by Transfinite Systems Limited. Results with omni-directional antennas and plans to extend the models to represent AeroMACS more accurately will be presented. These models should enable realistic analyses of emerging AeroMACS designs to be developed from NASA Test Bed, RTCA 223, and European results.

  12. A channel- and QoS-adaptive turbo coded modulation architecture for mobile multimedia communication

    Institute of Scientific and Technical Information of China (English)

    Zuo Jiancun; Song Wentao; Luo Hanwen; Xu Youyun

    2009-01-01

    This paper proposed a cross-layer dual adaptive coded modulation architecture using turbo codes for mobile multimedia communication, which simultaneously adapted to both the varying channel characteristics and the quality of service (QoS) of various mobile multimedia services to increase the average system throughput substantially. A pragmatic channel-adaptive turbo coded modulation scheme, which comes within 2.5dB of the Shannon limit, was optimally designed, and then a QoS-adaptive scheme was superimposed to build the dual adaptive architecture. Simulation results show that the novel dual adaption reduces the difference with the fading channel capacity to 2dB when assuming different services occur in equal probability and the service duration follows the exponential distribution.

  13. Open Platform Technology-Based Mobile Communications to Identify a Vehicle in Any Location

    Directory of Open Access Journals (Sweden)

    Catalin Lupu

    2009-01-01

    Full Text Available The purpose of this project is to develop an openservice platform for identifying a vehicle in any given locationusing Trimble GPS receivers Lasser SK II and necessary forthe Zapp mobile terminals mobile Internet connection basedon CDMA technology and TCP / IP.The analysis can be based on: studying the specific for thedomain of identification of persons that are moving in adelimited region inside the country; studying of theinformatics and communication technologies as a support fora new vision on the localization of persons; studying the GPStechnology; studying the actually GIS solutions; standardsregarding the information exchange at international level.The main object consists in the elaboration of a softwareapplication for the localization of persons that are in difficultyand the receiving of the first-aid in real-time. According tothis, the persons that are moving (in buses, auto, train,airplane, etc. can request the first-aid and they are spottedand identified using modern informatics technologies.

  14. Mobile phone-based biosensing: An emerging "diagnostic and communication" technology.

    Science.gov (United States)

    Quesada-González, Daniel; Merkoçi, Arben

    2017-06-15

    In this review we discuss recent developments on the use of mobile phones and similar devices for biosensing applications in which diagnostics and communications are coupled. Owing to the capabilities of mobile phones (their cameras, connectivity, portability, etc.) and to advances in biosensing, the coupling of these two technologies is enabling portable and user-friendly analytical devices. Any user can now perform quick, robust and easy (bio)assays anywhere and at any time. Among the most widely reported of such devices are paper-based platforms. Herein we provide an overview of a broad range of biosensing possibilities, from optical to electrochemical measurements; explore the various reported designs for adapters; and consider future opportunities for this technology in fields such as health diagnostics, safety & security, and environment monitoring.

  15. Mobile Communication Network Applied to Vehicle Communication%适用于车联网应用的移动通信网络

    Institute of Scientific and Technical Information of China (English)

    王艺; 邓佳佳; 林毅; 魏亮

    2012-01-01

    车联网不同场景使用的通信技术有所不同.除了近距离通信技术外,属于中远距离通信技术的移动通信网络在V2I中扮演了重要的角色.但需要采取多种措施来弥补和完善以H2H通信为初始设计目标的移动通信网络的不足,以适应当前和未来车联网应用对中远距离通信的需求.基于此,本文提出了移动通信网络承载车联网应用的3个主要问题,并论述了通过多种网络的应用、终端和平台的改进、网络的简单优化以及实施特定的网络改进等方案来解决上述问题的思路.%Different communication technologies are used in different cases of vehicle communication. Mobile communication network is a kind of medium and long range communication technology. It has played an important role in V2I. But, for the requirements of current and future vehicle communication, we still need make efforts to improve the ability of mobile communication network which is designed for H2H communication originally. The article discusses three main problems of mobile network for vehicle communication. And it suggests that we may solve those problems by different ways, for example, the application of different kinds of networks, the improvement of software on terminals and platform, the simple optimization of mobile network, and the protocol adaptation of mobile network.

  16. Delivery of satellite based broadband services

    Science.gov (United States)

    Chandrasekhar, M. G.; Venugopal, D.

    2007-06-01

    Availability of speedy communication links to individuals and organizations is essential to keep pace with the business and social requirements of this modern age. While the PCs have been continuously growing in processing speed and memory capabilities, the availability of broadband communication links still has not been satisfactory in many parts of the world. Recognizing the need to give fillip to the growth of broadband services and improve the broadband penetration, the telecom policies of different counties have placed special emphasis on the same. While emphasis is on the use of fiber optic and copper in local loop, satellite communications systems will play an important role in quickly establishing these services in areas where fiber and other communication systems are not available and are not likely to be available for a long time to come. To make satellite communication systems attractive for the wide spread of these services in a cost effective way special emphasis has to be given on factors affecting the cost of the bandwidth and the equipment. As broadband services are bandwidth demanding, use of bandwidth efficient modulation technique and suitable system architecture are some of the important aspects that need to be examined. Further there is a need to re-look on how information services are provided keeping in view the user requirements and broadcast capability of satellite systems over wide areas. This paper addresses some of the aspects of delivering broadband services via satellite taking Indian requirement as an example.

  17. Superconducting filter with a linear phase for third-generation mobile communications

    Energy Technology Data Exchange (ETDEWEB)

    Li Fei [National Laboratory for Superconductivity, Institute of Physics Chinese Academy of Sciences and Beijing National Laboratory for Condensed Matter Physics, Beijing 100080 (China); Zhang Xueqiang [National Laboratory for Superconductivity, Institute of Physics Chinese Academy of Sciences and Beijing National Laboratory for Condensed Matter Physics, Beijing 100080 (China); Meng Qingduan [Electronics and Information Engineering Department, Henan University of Science and Technology, Luoyang 471003 (China); Sun Liang [National Laboratory for Superconductivity, Institute of Physics Chinese Academy of Sciences and Beijing National Laboratory for Condensed Matter Physics, Beijing 100080 (China); Zhang Qiang [National Laboratory for Superconductivity, Institute of Physics Chinese Academy of Sciences and Beijing National Laboratory for Condensed Matter Physics, Beijing 100080 (China); Li Chunguang [National Laboratory for Superconductivity, Institute of Physics Chinese Academy of Sciences and Beijing National Laboratory for Condensed Matter Physics, Beijing 100080 (China); Li Shunzhou [Institute of Acoustics, Chinese Academy of Sciences, Beijing 100080 (China); He Aisheng [National Laboratory for Superconductivity, Institute of Physics Chinese Academy of Sciences and Beijing National Laboratory for Condensed Matter Physics, Beijing 100080 (China); Li Hong [National Laboratory for Superconductivity, Institute of Physics Chinese Academy of Sciences and Beijing National Laboratory for Condensed Matter Physics, Beijing 100080 (China); He Yusheng [National Laboratory for Superconductivity, Institute of Physics Chinese Academy of Sciences and Beijing National Laboratory for Condensed Matter Physics, Beijing 100080 (China)

    2007-07-15

    A linear phase filter using two cross-coupled quadruplet structures to achieve self-equalization was designed at 2012.5 MHz with 5 MHz bandwidth for a third-generation mobile communications system. This filter was fabricated using double-sided YBCO films on a 2 inch diameter, 0.5 mm thick MgO substrate. In the measurement, it showed good matching in the passband, with reflection better than -15 dB. Moreover, the group delay variation is less than 50 ns over 89% of the filter bandwidth.

  18. The effect of electromagnetic interference from mobile communication on the performance of intensive care ventilators.

    Science.gov (United States)

    Jones, R P; Conway, D H

    2005-08-01

    Electromagnetic interference produced by wireless communication can affect medical devices and hospital policies exist to address this risk. During the transfer of ventilated patients, these policies may be compromised by essential communication between base and receiving hospitals. Local wireless networks (e.g. Bluetooth) may reduce the 'spaghetti syndrome' of wires and cables seen on intensive care units, but also generate electromagnetic interference. The aim of this study was to investigate these effects on displayed and actual ventilator performance. Five ventilators were tested: Drager Oxylog 2000, BREAS LTV-1000, Respironics BiPAP VISION, Puritan Bennett 7200 and 840. Electromagnetic interference was generated by three devices: Simoco 8020 radio handset, Nokia 7210 and Nokia 6230 mobile phone, Nokia 6230 communicating via Bluetooth with a Palm Tungsten T Personal Digital Assistant. We followed the American National Standard Recommended Practice for On-Site, Ad Hoc Testing (ANSI C63) for electromagnetic interference. We used a ventilator tester, to simulate healthy adult lungs and measure ventilator performance. The communication device under test was moved in towards each ventilator from a distance of 1 m in six axes. Alarms or error codes on the ventilator were recorded, as was ventilator performance. All ventilators tested, except for the Respironics VISION, showed a display error when subjected to electromagnetic interference from the Nokia phones and Simoco radio. Ventilator performance was only affected by the radio which caused the Puritan Bennett 840 to stop functioning completely. The transfer ventilators' performance were not affected by radio or mobile phone, although the mobile phone did trigger a low-power alarm. Effects on intensive care ventilators included display reset, with the ventilator restoring normal display function within 2 s, and low-power/low-pressure alarms. Bluetooth transmission had no effect on the function of all the

  19. Using a communication model to collect measurement data through mobile devices.

    Science.gov (United States)

    Bravo, José; Villarreal, Vladimir; Hervás, Ramón; Urzaiz, Gabriel

    2012-01-01

    Wireless systems and services have undergone remarkable development since the first mobile phone system was introduced in the early 1980s. The use of sensors in an Ambient Intelligence approach is a great solution in a medical environment. We define a communication architecture to facilitate the information transfer between all connected devices. This model is based in layers to allow the collection of measurement data to be used in our framework monitoring architecture. An overlay-based solution is built between network elements in order to provide an efficient and highly functional communication platform that allows the connection of a wide variety of devices and technologies, and serves also to perform additional functions such as the possibility to perform some processing in the network that may help to improve overall performance.

  20. Statistically validated mobile communication networks: Evolution of motifs in European and Chinese data

    CERN Document Server

    Li, Ming-Xia; Jiang, Zhi-Qiang; Kaski, Kimmo; Kertész, Janos; Miccichè, Salvatore; Tumminello, Michele; Zhou, Wei-Xing; Mantegna, Rosario N

    2014-01-01

    Big data open up unprecedented opportunities to investigate complex systems including the society. In particular, communication data serve as major sources for computational social sciences but they have to be cleaned and filtered as they may contain spurious information due to recording errors as well as interactions, like commercial and marketing activities, not directly related to the social network. The network constructed from communication data can only be considered as a proxy for the network of social relationships. Here we apply a systematic method, based on multiple hypothesis testing, to statistically validate the links and then construct the corresponding Bonferroni network, generalized to the directed case. We study two large datasets of mobile phone records, one from Europe and the other from China. For both datasets we compare the raw data networks with the corresponding Bonferroni networks and point out significant differences in the structures and in the basic network measures. We show eviden...

  1. Robust formation tracking control of mobile robots via one-to-one time-varying communication

    Science.gov (United States)

    Dasdemir, Janset; Loría, Antonio

    2014-09-01

    We solve the formation tracking control problem for mobile robots via linear control, under the assumption that each agent communicates only with one 'leader' robot and with one follower, hence forming a spanning-tree topology. We assume that the communication may be interrupted on intervals of time. As in the classical tracking control problem for non-holonomic systems, the swarm is driven by a fictitious robot which moves about freely and which is a leader to one robot only. Our control approach is decentralised and the control laws are linear with time-varying gains; in particular, this accounts for the case when position measurements may be lost over intervals of time. For both velocity-controlled and force-controlled systems, we establish uniform global exponential stability, hence consensus formation tracking, for the error system under a condition of persistency of excitation on the reference angular velocity of the virtual leader and on the control gains.

  2. A Reusable Component for Communication and Data Synchronization in Mobile Distributed Interactive Applications

    Directory of Open Access Journals (Sweden)

    Abdul Malik Khan

    2010-10-01

    Full Text Available In Distributed Interactive Applications (DIA such as multiplayer games, where many participants are involved in a same game session and communicate through a network, they may have an inconsistent view of the virtual world because of the communication delays across the network. This issue becomes even more challenging when communicating through a cellular network while executing the DIA client on a mobile terminal. Consistency maintenance algorithms may be used to obtain a uniform view of the virtual world. These algorithms are very complex and hard to program and therefore, the implementation and the future evolution of the application logic code become difficult. To solve this problem, we propose an approach where the consistency concerns are handled separately by a distributed component called a Synchronization Medium, which is responsible for the communication management as well as the consistency maintenance. We present the detailed architecture of the Synchronization Medium and the generic interfaces it offers to DIAs. We evaluate our approach both qualitatively and quantitatively. We first demonstrate that the Synchronization Medium is a reusable component through the development of two game applications, a car racing game and a space war game. A performance evaluation then shows that the overhead introduced by the Synchronization Medium remains acceptable.

  3. Advanced Software Ground Station and UAV Development for NLoS Control Using Mobile Communications

    Directory of Open Access Journals (Sweden)

    Amr AbdElHamid

    2015-01-01

    Full Text Available Over the last decades, Unmanned Aerial Systems (UASs have gained much attention due to their various applications in different sections. However, their communication range is limited to utilized communication equipment. Therefore, utilization of GSM channels opens a new prospect towards long distance UAV missions and mobile command and control centers. This paper demonstrates new design and development of a small-scale UAV and a Ground Control Station (GCS using GSM bidirectional communications for Non-Line of Sight (NLoS long range control. GCSs are considered the front end node in UAV guidance process. Therefore, the proposed GCS employs a two-layer framework to consider all ground pilot requirements. Moreover, a new exploitation of global weather forecast data is added to the GCS. On the other hand, the proposed airborne system utilizes a new integration of different Commercial off-the-Shelf (COTS components and excludes short range receivers. The ground and flight tests show that stable bidirectional GSM communication is established, reliable hardware integration is accomplished, real time performance is achieved, GCS functional fidelity is obtained, and low cost is maintained. Finally, some qualitative aspects of the proposed platform are presented to address the detailed features.

  4. Statistically validated mobile communication networks: the evolution of motifs in European and Chinese data

    Science.gov (United States)

    Li, Ming-Xia; Palchykov, Vasyl; Jiang, Zhi-Qiang; Kaski, Kimmo; Kertész, János; Miccichè, Salvatore; Tumminello, Michele; Zhou, Wei-Xing; Mantegna, Rosario N.

    2014-08-01

    Big data open up unprecedented opportunities for investigating complex systems, including society. In particular, communication data serve as major sources for computational social sciences, but they have to be cleaned and filtered as they may contain spurious information due to recording errors as well as interactions, like commercial and marketing activities, not directly related to the social network. The network constructed from communication data can only be considered as a proxy for the network of social relationships. Here we apply a systematic method, based on multiple-hypothesis testing, to statistically validate the links and then construct the corresponding Bonferroni network, generalized to the directed case. We study two large datasets of mobile phone records, one from Europe and the other from China. For both datasets we compare the raw data networks with the corresponding Bonferroni networks and point out significant differences in the structures and in the basic network measures. We show evidence that the Bonferroni network provides a better proxy for the network of social interactions than the original one. Using the filtered networks, we investigated the statistics and temporal evolution of small directed 3-motifs and concluded that closed communication triads have a formation time scale, which is quite fast and typically intraday. We also find that open communication triads preferentially evolve into other open triads with a higher fraction of reciprocated calls. These stylized facts were observed for both datasets.

  5. Mobile communication and new sense of places: a critique of spatialization in cyberculture Mobile communication and new sense of places: a critique of spatialization in cyberculture

    Directory of Open Access Journals (Sweden)

    André Lemos

    2009-06-01

    Full Text Available The underlying idea of this paper can be expressed as follows: informational mobile technologies have enabled new means of communication and sociability based on what I call "informational territories". What is at stake here is to question some visions about the relationship between informational technologies and place, territory, community and mobility. I will argue that, under the label of "locative media", new mobile technologies are creating new forms of territorialization (control, surveillance, tracking and new meanings of space, place, and territory, contradicting the theory of "non-place" or "no sense of place". Moreover, this impels us to argue the ideas of anomie and isolation with the emergence of new forms of sociability and community created by location-based services. Comunicação móvel e o novo sentido dos lugares: crítica da espacialização na cibercultura — A ideia básica deste artigo pode ser colocada da seguinte forma: tecnologias informacionais móveis têm permitindo novas formas de comunicação e sociabilidade com base naquilo que chamo de "territórios informacionais". O que está em jogo aqui é uma nova relação entre as tecnologias informacionais e as dimensões do local, do território, da comunidade e da mobilidade. Vamos mostrar como as novas tecnologias móveis, sob o rótulo de "mídias locativas", criam novas formas de territorialização (controle, vigilância, monitoramento e, contra as tese de "não-lugar" ou de um "não sentido dos lugares", o que estamos vendo são novas significações no espaço público urbano. Além disso, discutiremos as ideias de anomia e de isolamento com o surgimento de formas de sociabilidade e de vínculo comunitário criadas pelos serviços baseados em localização (LBS.

  6. Co-Channel Interference Mitigation Using Satellite Based Receivers

    Science.gov (United States)

    2014-12-01

    While there is some phase noise present in the continuous time-shifted signal, it is important to recognize that this signal is plotted over the [−π...NAVAL POSTGRADUATE SCHOOL MONTEREY, CALIFORNIA THESIS CO-CHANNEL INTERFERENCE MITIGATION USING SATELLITE BASED RECEIVERS by John E. Patterson...07-02-2012 to 12-19-2014 4. TITLE AND SUBTITLE CO-CHANNEL INTERFERENCE MITIGATION USING SATELLITE BASED RE- CEIVERS 5. FUNDING NUMBERS 6. AUTHOR(S

  7. Increasing the Lifetime of Mobile WSNs via Dynamic Optimization of Sensor Node Communication Activity

    Directory of Open Access Journals (Sweden)

    Dayan Adionel Guimarães

    2016-09-01

    Full Text Available In this paper, a simple and flexible method for increasing the lifetime of fixed or mobile wireless sensor networks is proposed. Based on past residual energy information reported by the sensor nodes, the sink node or another central node dynamically optimizes the communication activity levels of the sensor nodes to save energy without sacrificing the data throughput. The activity levels are defined to represent portions of time or time-frequency slots in a frame, during which the sensor nodes are scheduled to communicate with the sink node to report sensory measurements. Besides node mobility, it is considered that sensors’ batteries may be recharged via a wireless power transmission or equivalent energy harvesting scheme, bringing to the optimization problem an even more dynamic character. We report large increased lifetimes over the non-optimized network and comparable or even larger lifetime improvements with respect to an idealized greedy algorithm that uses both the real-time channel state and the residual energy information.

  8. The ELLIPSO (tm) system: Elliptical low orbits for mobile communications and other optimum system elements

    Science.gov (United States)

    Castiel, David

    1991-09-01

    On 5 Nov. 1990, Ellipsat filed with the FCC the first application to provide voice communication services via low earth orbiting (LEO) satellites. The proposed system, ELLIPSO, aims at achieving end-user costs comparable to those in the cellular industry. On 3 Jun. 1991 Ellipsat filed for the second complement of its system. Ellipsat was also the first company to propose combined position determination and mobile voice services via low-earth orbiting satellites. Ellipsat is still the only proponent of elliptical orbits for any commercial system in the United States. ELLIPSO uses a spectrum efficient combination of FDMA and CDMA techniques. Ellipsat's strategy is to tailor required capacity to user demand, reduce initial system costs and investment risks, and allow the provision of services at affordable end-user prices. ELLIPSO offers optimum features in all the components of its system, elliptical orbits, small satellites, integrated protocol and signalling system, integrated end-user electronics, novel marketing approach based on the cooperation with the tenets of mobile communications, end-user costs that are affordable, and a low risk approach as deployment is tailored to the growth of its customer base. The efficient design of the ELLIPSO constellation and system allows estimated end-user costs in the $.50 per minute range, five to six times less than any other system of comparable capability.

  9. The ELLIPSO (tm) system: Elliptical low orbits for mobile communications and other optimum system elements

    Science.gov (United States)

    Castiel, David

    1991-01-01

    On 5 Nov. 1990, Ellipsat filed with the FCC the first application to provide voice communication services via low earth orbiting (LEO) satellites. The proposed system, ELLIPSO, aims at achieving end-user costs comparable to those in the cellular industry. On 3 Jun. 1991 Ellipsat filed for the second complement of its system. Ellipsat was also the first company to propose combined position determination and mobile voice services via low-earth orbiting satellites. Ellipsat is still the only proponent of elliptical orbits for any commercial system in the United States. ELLIPSO uses a spectrum efficient combination of FDMA and CDMA techniques. Ellipsat's strategy is to tailor required capacity to user demand, reduce initial system costs and investment risks, and allow the provision of services at affordable end-user prices. ELLIPSO offers optimum features in all the components of its system, elliptical orbits, small satellites, integrated protocol and signalling system, integrated end-user electronics, novel marketing approach based on the cooperation with the tenets of mobile communications, end-user costs that are affordable, and a low risk approach as deployment is tailored to the growth of its customer base. The efficient design of the ELLIPSO constellation and system allows estimated end-user costs in the $.50 per minute range, five to six times less than any other system of comparable capability.

  10. Social Mobile Marketing: Evolution of Communication Strategies in the Web 2.0 Era

    Directory of Open Access Journals (Sweden)

    Stefano Franco

    2014-07-01

    Full Text Available Increasingly faster communicational streams - that ease interactions and allow agents to considerably enhance their own informational assets - characterize the era in which we live. The research about new media, mobile and social technologies is the driver of this changes that implements a revolution of the content management, of the information accessibility and of the relationships interactivity. These characteristics don’t leave the agents unresponsive and it is interesting and fitting to understand the tools available to firms and institutions and the communicational and marketing policies that organizations put to use to achieve their goals. In this context we want to find strategic and operational models to support organizations decisions about markets and territories. The purpose of this article is to understand how small organizations can utilize networks that characterize new trends in marketing. We conclude by providing some thoughts on the future evolution of the research in this field also with reference to the smart city that can exploit social mobile marketing for promotion of the territory and social participation.I

  11. A new mHealth communication framework for use in wearable WBANs and mobile technologies.

    Science.gov (United States)

    Hamida, Sana Tmar-Ben; Hamida, Elyes Ben; Ahmed, Beena

    2015-02-03

    Driven by the development of biomedical sensors and the availability of high mobile bandwidth, mobile health (mHealth) systems are now offering a wider range of new services. This revolution makes the idea of in-home health monitoring practical and provides the opportunity for assessment in "real-world" environments producing more ecologically valid data. In the field of insomnia diagnosis, for example, it is now possible to offer patients wearable sleep monitoring systems which can be used in the comfort of their homes over long periods of time. The recorded data collected from body sensors can be sent to a remote clinical back-end system for analysis and assessment. Most of the research on sleep reported in the literature mainly looks into how to automate the analysis of the sleep data and does not address the problem of the efficient encoding and secure transmissions of the collected health data. This article reviews the key enabling communication technologies and research challenges for the design of efficient mHealth systems. An end-to-end mHealth system architecture enabling the remote assessment and monitoring of patient's sleep disorders is then proposed and described as a case study. Finally, various mHealth data serialization formats and machine-to-machine (M2M) communication protocols are evaluated and compared under realistic operating conditions.

  12. Securing E-mail Communication Using Hybrid Cryptosystem on Android-based Mobile Devices

    Directory of Open Access Journals (Sweden)

    Andri Zakariya

    2012-08-01

    Full Text Available One of the most popular internet services is electronic mail (e-mail. By using mobile devices with internet connection, e-mail can be widely used by anyone to exchange information anywhere and anytime whether public or confidential. Unfortunately, there are some security issues with email communication; e-mail is sent in over open networks and e-mail is stored on potentially insecure mail servers. Moreover, e-mail has no integrity protection so the body can be undectected altered in transit or on the e-mail server. E-mail also has no data origin authentication, so people cannot be sure that the emails they receive are from the e-mail address owner. In order to solve this problem, this study proposes a secure method of e-mail communication on Android-based mobile devices using a hybrid cryptosystem which combines symmetric encryption, asymmetric encryption and hash function. The experimental results show that the proposed method succeeded in meeting those aspects of information security including confidentiality, data integrity, authentication, and non-repudiation.

  13. Securing E-mail Communication Using Hybrid Cryptosystem on Android-based Mobile Devices

    Directory of Open Access Journals (Sweden)

    Andri Zakariya

    2012-12-01

    Full Text Available One of the most popular internet services is electronic mail (e-mail. By using mobile devices with internet connection, e-mail can be widely used by anyone to exchange information anywhere and anytime whether public or confidential. Unfortunately, there are some security issues with email communication; e-mail is sent in over open networks and e-mail is stored on potentially insecure mail servers. Moreover, e-mail has no integrity protection so the body can be undectected altered in transit or on the e-mail server. E-mail also has no data origin authentication, so people cannot be sure that the emails they receive are from the e-mail address owner. In order to solve this problem, this study proposes a secure method of e-mail communication on Android-based mobile devices using a hybrid cryptosystem which combines symmetric encryption, asymmetric encryption and hash function. The experimental results show that the proposed method succeeded in meeting those aspects of information security including confidentiality, data integrity, authentication, and non-repudiation.

  14. Esoko and WhatsApp Communication in Ghana : Mobile Services such as Esoko and WhatsApp in Reshaping Interpersonal Digital Media Communication in Ghana

    OpenAIRE

    Cynthia, Salkovic

    2015-01-01

    The predominant use of mobile media such as SMS and MIM across various sectors in Ghana is incontrovertibly influencing and reshaping interpersonal communications. This paper looked at the use of the Esoko SMS and WhatsApp MIM platforms and how the use of these two dominant platforms are enhancing and reshaping digital communication in the rural and urban Ghana respectively, as barriers of socioeconomic factors limits the use of sophisticated technologies in the rural setting. This is done by...

  15. Structured P2P overlay of mobile brokers for realizing publish/subscribe communication in VANET.

    Science.gov (United States)

    Pandey, Tulika; Garg, Deepak; Gore, Manoj Madhava

    2014-01-01

    Publish/subscribe communication paradigm provides asynchrony and decoupling, making it an elegant alternative for designing applications in distributed and dynamic environment such as vehicular ad hoc networks (VANETs). In this paradigm, the broker is the most important component that decouples other two components, namely, publisher and subscriber. Previous research efforts have either utilized the deployment of distributed brokers on stationary road side info-stations or have assigned the role of broker to any moving vehicle on ad hoc basis. In one approach, lots of preinstalled infrastructures are needed whereas, in another, the quality of service is not guaranteed due to unpredictable moving and stopping patterns of vehicles. In this paper, we present the architecture of distributed mobile brokers which are dynamically reconfigurable in the form of structured P2P overlay and act as rendezvous points for matching publications and subscriptions. We have taken city buses in urban settings to act as mobile brokers whereas other vehicles are considered to be in role of publishers and subscribers. These mobile brokers also assist in locating a vehicle for successful and timely transfer of notifications. We have performed an extensive simulation study to compare our approach with previously proposed approaches. Simulation results establish the applicability of our approach.

  16. Mobile communication and ethics: implications of everyday actions on social order

    Directory of Open Access Journals (Sweden)

    Rich Ling

    2010-07-01

    Full Text Available Of the many opportunities and affordances that mobile technologies bring to our day-to-day lives, the ability to cheat physical separation and remain accessible to each other—in an instant—also brings pressure to bear on well-established social conventions as to how we should act when we are engaged with others in shared spaces. In this paper we explore some ethical dimensions of mobile communication by considering the manner in which individuals in everyday contexts balance interpretations of emergent social conventions with personal desires to connect in the moment. As we later discuss, the decisions made in response to a ringing mobile phone or flashing text message emerge from consequential versus deontological ethical frames used to determine what to do versus what we ought to do. This is particularly true in western and North American cultural contexts from which our data are collected. Using Goffman's dramaturgy, we suggest that these conflicts occurring on an individual level provide evidence of social structure, and are simultaneously entwined with our less obvious ruminations on the maintenance of social order.http://dx.doi.org/10.5324/eip.v4i2.1760

  17. A Novel Mobile Communications Authentication Scheme with Roaming Service and User Anonymity

    Directory of Open Access Journals (Sweden)

    Kai Chain

    2016-11-01

    Full Text Available Many novel, effective, and efficient applications and networking services are being developed for the Social Internet of Things. Recently, Li proposed a more secure and efficient authentication scheme with roaming service and user anonymity for mobile communications. The security analysis and discussion of the agreement phase is sufficiently safe; however, an attacker can intercept the identity of a mobile user’s home agent in the authentication phase. By using this information, the attacker can mount distributed denial-of-service attacks in the roaming phase through replay attacks targeting the network’s foreign agent and mobile user’s home agent by using their corresponding session keys. Li’s method also has some shortcomings regarding anonymity that we aim to address. To overcome these issues, this study proposes an elliptic curve–based wireless roaming anonymous login method for the authentication phase. The problems faced in the roaming phase are resolved, and this approach provides balanced session key computation between senders and receivers. Burrows-Abadi-Needham logic (BAN-logic is used to verify the security of the proposed scheme. The proposed scheme affords good security, efficiency, and integrity and maintains anonymity.

  18. Place-based attributes predict community membership in a mobile phone communication network.

    Directory of Open Access Journals (Sweden)

    T Trevor Caughlin

    Full Text Available Social networks can be organized into communities of closely connected nodes, a property known as modularity. Because diseases, information, and behaviors spread faster within communities than between communities, understanding modularity has broad implications for public policy, epidemiology and the social sciences. Explanations for community formation in social networks often incorporate the attributes of individual people, such as gender, ethnicity or shared activities. High modularity is also a property of large-scale social networks, where each node represents a population of individuals at a location, such as call flow between mobile phone towers. However, whether or not place-based attributes, including land cover and economic activity, can predict community membership for network nodes in large-scale networks remains unknown. We describe the pattern of modularity in a mobile phone communication network in the Dominican Republic, and use a linear discriminant analysis (LDA to determine whether geographic context can explain community membership. Our results demonstrate that place-based attributes, including sugar cane production, urbanization, distance to the nearest airport, and wealth, correctly predicted community membership for over 70% of mobile phone towers. We observed a strongly positive correlation (r = 0.97 between the modularity score and the predictive ability of the LDA, suggesting that place-based attributes can accurately represent the processes driving modularity. In the absence of social network data, the methods we present can be used to predict community membership over large scales using solely place-based attributes.

  19. Structured P2P Overlay of Mobile Brokers for Realizing Publish/Subscribe Communication in VANET

    Science.gov (United States)

    Pandey, Tulika; Garg, Deepak; Gore, Manoj Madhava

    2014-01-01

    Publish/subscribe communication paradigm provides asynchrony and decoupling, making it an elegant alternative for designing applications in distributed and dynamic environment such as vehicular ad hoc networks (VANETs). In this paradigm, the broker is the most important component that decouples other two components, namely, publisher and subscriber. Previous research efforts have either utilized the deployment of distributed brokers on stationary road side info-stations or have assigned the role of broker to any moving vehicle on ad hoc basis. In one approach, lots of preinstalled infrastructures are needed whereas, in another, the quality of service is not guaranteed due to unpredictable moving and stopping patterns of vehicles. In this paper, we present the architecture of distributed mobile brokers which are dynamically reconfigurable in the form of structured P2P overlay and act as rendezvous points for matching publications and subscriptions. We have taken city buses in urban settings to act as mobile brokers whereas other vehicles are considered to be in role of publishers and subscribers. These mobile brokers also assist in locating a vehicle for successful and timely transfer of notifications. We have performed an extensive simulation study to compare our approach with previously proposed approaches. Simulation results establish the applicability of our approach. PMID:24523629

  20. Structured P2P Overlay of Mobile Brokers for Realizing Publish/Subscribe Communication in VANET

    Directory of Open Access Journals (Sweden)

    Tulika Pandey

    2014-01-01

    Full Text Available Publish/subscribe communication paradigm provides asynchrony and decoupling, making it an elegant alternative for designing applications in distributed and dynamic environment such as vehicular ad hoc networks (VANETs. In this paradigm, the broker is the most important component that decouples other two components, namely, publisher and subscriber. Previous research efforts have either utilized the deployment of distributed brokers on stationary road side info-stations or have assigned the role of broker to any moving vehicle on ad hoc basis. In one approach, lots of preinstalled infrastructures are needed whereas, in another, the quality of service is not guaranteed due to unpredictable moving and stopping patterns of vehicles. In this paper, we present the architecture of distributed mobile brokers which are dynamically reconfigurable in the form of structured P2P overlay and act as rendezvous points for matching publications and subscriptions. We have taken city buses in urban settings to act as mobile brokers whereas other vehicles are considered to be in role of publishers and subscribers. These mobile brokers also assist in locating a vehicle for successful and timely transfer of notifications. We have performed an extensive simulation study to compare our approach with previously proposed approaches. Simulation results establish the applicability of our approach.

  1. Performance Evaluation of Public Key Based Authentication in Future Mobile Communication Systems

    Directory of Open Access Journals (Sweden)

    Kambourakis Georgios

    2004-01-01

    Full Text Available While mobile hosts are evolving into full-IP enabled devices, there is a greater demand to provide a more flexible, reconfigurable, and scalable security mechanism in mobile communication systems beyond 3G (B3G. Work has already begun on such an “all-IP” end-to-end solution, commonly referred to as 4G systems. Fully fledged integration between heterogeneous networks, such as 2.5G, UMTS, WLAN, Bluetooth, and the Internet, demands fully compatible, time-tested, and reliable mechanisms to depend on. SSL protocol has proved its effectiveness in the wired Internet and it will probably be the most promising candidate for future wireless environments. In this paper, we discuss existing problems related to authentication and key agreement (AKA procedures, such as compromised authentication vectors attacks, as they appear in current 2/2.5G/3G mobile communication systems, and propose how SSL, combined with public key infrastructure (PKI elements, can be used to overcome these vulnerabilities. In this B3G environment, we perceive authentication as a service, which has to be performed at the higher protocol layers irrespective of the underlying network technology. Furthermore, we analyze the effectiveness of such a solution, based on measurements of a “prototype” implementation. Performance measurements indicate that SSL-based authentication can be possible in terms of service time in future wireless systems, while it can simultaneously provide both the necessary flexibility to network operators and a high level of confidence to end users.

  2. Power Aware Mobility Management of M2M for IoT Communications

    Directory of Open Access Journals (Sweden)

    Awais Ahmad

    2015-01-01

    Full Text Available Machine-to-Machine (M2M communications framework is evolving to sustain faster networks with the potential to connect millions of devices in the following years. M2M is one of the essential competences for implementing Internet of Things (IoT. Therefore, various organizations are now focusing on enhancing improvements into their standards to support M2M communications. Thus, Heterogeneous Mobile Ad Hoc Network (HetMANET can normally be considered appropriate for M2M challenges. These challenges incorporated when a mobile node (MN selects a target network in an energy efficient scanning for efficient handover. Therefore, to cope with these constraints, we proposed a vertical handover scheme for handover triggering and selection of an appropriate network. The proposed scheme is composed of two phases. Firstly, the MNs perform handover triggering based on the optimization of the Receive Signal Strength (RSS from an access point/base station (AP/BS. Secondly, the network selection process is performed by considering the cost and energy consumption of a particular application during handover. Moreover, if there are more networks available, then the MN selects the one provided with the highest quality of service (QoS. The decision regarding the selection of available networks is made on three metrics, that is, cost, energy, and data rate. Furthermore, the selection of an AP/BS of the selected network is made on five parameters: delay, jitter, Bit Error Rate (BER, communication cost, and response time. The numerical and experimental results are compared in the context of energy consumption by an MN, traffic management on an AP/BS, and QoS of the available networks. The proposed scheme efficiently optimizes the handoff related parameters, and it shows significant improvement in the existing models used for similar purpose.

  3. System Coverage and Capacity Analysis on Millimeter-Wave Band for 5G Mobile Communication Systems with Massive Antenna Structure

    Directory of Open Access Journals (Sweden)

    Jun Suk Kim

    2014-01-01

    Full Text Available The use of a millimeter-wave band defined as a 30–300 GHz range is significant element for improving performance of 5th generation (5G mobile communication systems. However, since the millimeter-wave signal has peculiar propagation characteristics especially toward non-line-of-sight regions, the system architecture and antenna structure for 5G mobile communications should be designed to overcome these propagation limitations. For realization of the 5G mobile communications, electronics and telecommunications research institute (ETRI is developing central network applying various massive antenna structures with beamforming. In this paper, we have introduced the central network and evaluated the system coverage and capacity through C++ language-based simulations with real geospatial information.

  4. Hybrid TOA/AOA Schemes for Mobile Location In Cellular Communications Systems

    Directory of Open Access Journals (Sweden)

    Chien-Sheng Chen

    2010-06-01

    Full Text Available Wireless location is to determine the position of t he mobile station (MS in wireless communication networks. Due to the measurements with large errors , location schemes give poorer performance in non-line-of-sight (NLOS environments. This paper i llustrates methods to integrate all the available heterogeneous measurements to achieve more accurate location estimation. The proposed hybrid schemes combine time of arrival (TOA at seven BSs and angle of arrival (AOA information at the serving BS to give location estimation of the MS. T he schemes mitigate the NLOS effect simply by the weighted sum of the intersections between seven TOA circles and the AOA line without requiring priori knowledge of NLOS error statistics. Different NLOS models were used to evaluate the proposed methods. It is shown by the simulation results that the prop osed methods provide better location accuracy comparing with Taylor series algorithm (TSA and th e hybrid lines of position algorithm (HLOP.

  5. Energy consumption of mobile communication systems; Energieverbrauch der mobilen Kommunikation - Schlussbericht

    Energy Technology Data Exchange (ETDEWEB)

    Corliano, A.; Hufschmid, M.

    2008-02-15

    This final report for the Swiss Federal Office of Energy (SFOE) reports on a research project that was concerned with the energy consumption of the infrastructure necessary to provide mobile communication services. The measurement and analysis of the energy consumption of the infrastructure was an essential part of this research project. Furthermore, future scenarios and their impact on energy consumption are discussed. The results of the research work are presented and the correlation between power requirements and the data traffic encountered at GSM and UMTS base stations is analysed. Furthermore, measurements that were conducted to determine the power consumption of different network elements are discussed. Finally, alternatives for further action and recommendations for improvements in the energy consumption of such installations are formulated.

  6. The Environment Friendly Power Source for Power Supply of Mobile Communication Base Stations

    Science.gov (United States)

    Rudenko, N. V.; Ershov, V. V.; Evstafiev, V. V.

    2017-05-01

    The article describes the technical proposals to improve environmental and resource characteristics of the autonomous power supply systems of mobile communication base stations based on renewable energy sources, while ensuring the required reliability and security of power supply. These include: the replacement of diesel-generator with clean energy source - an electrochemical generator based on hydrogen fuel cells; the use of wind turbines with a vertical axis; use of specialized batteries. Based on the analysis of the know technical solutions, the structural circuit diagram of the hybrid solar-wind-hydrogen power plant and the basic principles of the algorithm of its work were proposed. The implementation of these proposals will improve the environmental and resource characteristics.

  7. The design and networking of dynamic satellite constellations for global mobile communication systems

    Science.gov (United States)

    Cullen, Cionaith J.; Benedicto, Xavier; Tafazolli, Rahim; Evans, Barry

    1993-01-01

    Various design factors for mobile satellite systems, whose aim is to provide worldwide voice and data communications to users with hand-held terminals, are examined. Two network segments are identified - the ground segment (GS) and the space segment (SS) - and are seen to be highly dependent on each other. The overall architecture must therefore be adapted to both of these segments, rather than each being optimized according to its own criteria. Terrestrial networks are grouped and called the terrestrial segment (TS). In the SS, of fundamental importance is the constellation altitude. The effect of the altitude on decisions such as constellation design choice and on network aspects like call handover statistics are fundamental. Orbit resonance is introduced and referred to throughout. It is specifically examined for its useful properties relating to GS/SS connectivities.

  8. Turbo product codes and their application in the fourth-generation mobile communication system

    Science.gov (United States)

    He, Yejun; Zhu, Guangxi; Liu, Ying Zhuang; Liu, Jian

    2004-04-01

    In this paper, we firstly present turbo product codes (TPCs) for forward error correction (FEC) coding, including TPCs encoding process and decoding principle, and then compare TPCs with turbo convolutional codes (TCCs) error coding solution. The performance of TPCs is shown to be closer to the Shannon limit than TCCs. Secondly, we introduce TPCs" application in the 4th generation (4G) mobile communication system which is being developed in our country at present. The concept of TPC-OFDM system which promises higher code rate than conventional OFDM is first modified. Finally, simulation results show that the simplified 4G uplink systems offer Bit Error Rate of nearly 0 over IMT-2000 channel at Eb/N0 > 15dB.

  9. RGB visible light communication using mobile-phone camera and multi-input multi-output.

    Science.gov (United States)

    Liang, Kevin; Chow, Chi-Wai; Liu, Yang

    2016-05-01

    Red, green, blue (RGB) light-emitting-diodes (LEDs) are used to increase the visible light communication (VLC) transmission capacity via wavelength-division-multiplexing (WDM), and the color image sensor in mobile phone is used to separate different color signals via a color filter array. However, due to the wide optical bandwidths of the color filters, there is a high spectral overlap among different channels, and a high inter-channel interference (ICI) happens. Here, we propose and demonstrate an RGB VLC transmission using CMOS image sensor with multi-input multi-output (MIMO) technique to mitigate the ICI and retrieve the three independent color channels in the rolling shutter pattern. Data pattern extinction-ratio (ER) enhancement and thresholding are deployed.

  10. Fabrication and laboratory testing of a high-temperature superconducting subsystem for DSC1800 mobile communications

    CERN Document Server

    LiuKun; Zhu Mei Hong; Wei Bin; Liu Bang Chang; Zhang Xia; Gao Long Ma; Zhang Guo Yong; He Wen Jun; Gao Bao Xin

    2002-01-01

    In this paper, we report on the design, fabrication and testing of a 20-pole high-temperature superconducting (HTS) filter for DSC1800 mobile communications with the pass band from 1710 to 1785 MHz. The test results show that the insertion loss of the pass band is less than 0.3 dB, the out-of-band rejection is better than 65 dB, and the steepness of the band edges is greater than 14 dB MHz sup - sup 1. We also tested an HTS subsystem, which consists of the HTS filter, a low-noise amplifier (LNA) with 21 dB gain and a Stirling Cooler, and a traditional subsystem, which consists of a traditional filter and a LNA with 23 dB gain. The results show that the HTS subsystem is much better than the conventional subsystem.

  11. Concepts and cost trade-offs for land vehicle antennas in satellite mobile communications

    Science.gov (United States)

    Haddad, H. A.

    1948-01-01

    Several antenna design concepts, operating at UHF (821 to 825 MHz transmit and 866 to 870 MHz receive bands), with gain ranging between 6 and 12 dBic, that are suitable for land mobile vehicles are presented. The antennas may be used within CONUS and ALASKA to communicate to and from a geosynchronous satellite. Depending on the type of steering mechanism, the antennas are broken down into three categories; (1) electronically scanned arrays with phase shifters, (2) electronically switched arrays with switchable power dividers/combiners, and (3) mechanically steered arrays. The operating characteristics of two of these design concepts, one a conformal antenna with electronic beam steering and the other a nonconformal design with mechanical steering, were evaluated with regard to two and three satellite system. Cost estimates of various antenna concepts were made and plotted against their overall gain performance.

  12. Human Being as a Communication Portal: The Construction of the Profile on Mobile Phones

    Directory of Open Access Journals (Sweden)

    J Canavilhas

    2013-09-01

    Full Text Available Introduction. The incorporation of mobile phones in the daily life of human being not only alters space and time dimensions, but it also changes the perception and the way we relate with the ecosystem. Methodology. The state of the art is analyzed from the technological concept of intimacy, used by Boyce and Hancock, which describes the levels of interaction between man and technology. Then, a methodology to explore issues increasingly pressing is proposed, especially, concerning the delimitation of public and private spheres and the interaction in the common space. Results and conclusions. Following in particular the theories of Castells, Heidegger, Meyrowitz and Habermas; a set of categories for deepening the concepts of spatialization, willingness and profile are articulated. These concepts are identified as key elements in this first stage of the project for the analysis of the human being as a communication portal.

  13. Control over social interactions: an important reason for young people's use of the Internet and mobile phones for communication?

    Science.gov (United States)

    Madell, Dominic E; Muncer, Steven J

    2007-02-01

    This paper reports some research that was undertaken to determine why young people choose to use certain communication media, especially the Internet and mobile phones for social purposes. Focus group methodology was employed in achieving this aim. Specifically, two focus groups containing young people aged 18-20 years were asked to discuss the question "why do you use different communication media, such as the Internet and mobile phones, in your social lives?" Discussions from the sessions were recorded on audiotapes, and then transcribed, and analyzed according to the principles of Grounded Theory. A number of categories emerged from the data. The most significant category indicated that young people often liked to use communication media such as the Internet and mobile phones to communicate because these afforded them control over their interactions. In particular, the data seemed to suggest that participants felt that because some communication media such as email, text messaging and instant messaging can be used asynchronously as well as synchronously, they allow one time to stop and think before giving a response if this is desired, or, alternatively, allowed one to retain the conversational nature of interactions if this is preferred. This gave participants greater control over interactions than they would have if, say, communicating via voice calls using the telephone or face-to-face, which are necessarily synchronous.

  14. Terminal-to-Terminal Calling for GEO Broadband Mobile Satellite Communication

    Institute of Scientific and Technical Information of China (English)

    Jinsheng Yang

    2015-01-01

    Satellite and terrestrial components of IMT⁃Advanced need to be integrated so that the traditional strengths of each compo⁃nent can be fully exploited. LTE/LTE⁃A is now a recognized foundation of terrestrial 4G networks, and mobile satellite net⁃works should be based on it. Long transmission delay is one of the main disadvantages of satellite communication, espe⁃cially in a GEO system, and terminal⁃to⁃terminal (TtT) design reduces this delay. In this paper, we propose a protocol archi⁃tecture based on LTE/LTE⁃A for GEO mobile satellite commu⁃nication. We propose a detailed call procedure and four TtT modes for this architecture. We describe the division of tasks between the satellite gateway (SAT⁃GW) and satellite as well as TtT processing in the physical layer of the satellite in or⁃der to reduce delay and ensure compatibility with a terrestrial LTE/LTE⁃A system.

  15. New Insight into Inter-kingdom Communication: Horizontal Transfer of Mobile Small RNAs

    Directory of Open Access Journals (Sweden)

    Xi Chen

    2017-05-01

    Full Text Available Small RNAs (sRNAs, including small interfering RNAs (siRNAs and microRNAs (miRNAs, are conventionally regarded as critical molecular regulators of various intracellular processes. However, recent accumulating evidence indicates that sRNAs can be transferred within cells and tissues and even across species. In plants, nematodes and microbes, these mobile sRNAs can mediate inter-kingdom communication, environmental sensing, gene expression regulation, host-parasite defense and many other biological functions. Strikingly, a recent study by our group suggested that ingested plant miRNAs are transferred to blood, accumulate in tissues and regulate transcripts in consuming animals. While our and other independent groups’ subsequent studies further explored the emerging field of sRNA-mediated crosstalk between species, some groups reported negative results and questioned its general applicability. Thus, further studies carefully evaluating the horizontal transfer of exogenous sRNAs and its potential biological functions are urgently required. Here, we review the current state of knowledge in the field of the horizontal transfer of mobile sRNAs, suggest its future directions and key points for examination and discuss its potential mechanisms and application prospects in nutrition, agriculture and medicine.

  16. A Provably-Correct Protocol for Seamless Communication with Mobile, Multi-Homed Hosts

    CERN Document Server

    Arye, Matvey; Kiefer, Robert; Rexford, Jennifer; Freedman, Michael J

    2012-01-01

    Modern consumer devices, like smartphones and tablets, have multiple interfaces (e.g., WiFi and 3G) that attach to new access points as users move. These mobile, multi-homed computers are a poor match with an Internet architecture that binds connections to fixed end-points with topology- dependent addresses. As a result, hosts typically cannot spread a connection over multiple interfaces or paths, or change locations without breaking existing connections. In this paper, we introduce ECCP, an end-host connection control protocol that allows hosts to communicate over mul- tiple interfaces with dynamically-changing IP addresses. Each ECCP connection consists of one or more flows, each associated with an interface or path. A host can move an existing flow from one interface to another or change the IP address using in-band signaling, without any support from the underlying network. We use formal models to verify that ECCP works correctly in the presence of packet loss, out-of-order delivery, and frequent mobility...

  17. Hysteresis in consumer markets with focus on the mobile communications market

    Science.gov (United States)

    Twomey, C.

    2008-11-01

    Our aim here is to try to identify hysteresis in the switching patterns of consumers in the Irish mobile phone industry. It was not until the introduction by the Communication Regulator of full-number portability that consumers began to take advantage of the savings that switching mobile phone operator could produce. As with most relatively new industries, the awareness of savings is clouded by a lack of understanding of whats on offer and an underlying fear of change from something they have only just started to comprehend. With people changing company loyalties more frequently than ever at the prospect of better, more cost-efficient services, it is now the million euro question for the phone companies on how close they should match each others' offers to maximize their profits, and what their best pricing strategy should be to obtain an even larger share of the market. Through the use of experimental economics and by modelling switching behaviour using the Preisach model, along with observed and market data, we hope to both pose this problem and start the journey to answering this question.

  18. Ensuring the security and privacy of information in mobile health-care communication systems

    Directory of Open Access Journals (Sweden)

    Ademola P. Abidoye

    2011-09-01

    Full Text Available The sensitivity of health-care information and its accessibility via the Internet and mobile technology systems is a cause for concern in these modern times. The privacy, integrity and confidentiality of a patient’s data are key factors to be considered in the transmission of medical information for use by authorised health-care personnel. Mobile communication has enabled medical consultancy, treatment, drug administration and the provision of laboratory results to take place outside the hospital. With the implementation of electronic patient records and the Internet and Intranets, medical information sharing amongst relevant health-care providers was made possible. But the vital issue in this method of information sharing is security: the patient’s privacy, as well as the confidentiality and integrity of the health-care information system, should not be compromised. We examine various ways of ensuring the security and privacy of a patient’s electronic medical information in order to ensure the integrity and confidentiality of the information.

  19. BIOLOGICAL AND HEALTH EFFECTS OF EXPOSURE TO ELECTROMAGNETIC FIELD FROM MOBILE COMMUNICATIONS SYSTEMS

    Directory of Open Access Journals (Sweden)

    Masao TAKI

    2001-01-01

    Full Text Available Mobile communication devices are sources of radiofrequency (RF electromagnetic field (EMF that are common in daily life and can cause strong exposure to the head. Possible adverse health effects, especially on brain functions, have been of great concern among the general public since the explosive penetration of this technology began in the 1990's. The exposure complies with current safety guidelines. The established knowledge of biological effects of RF does not provide any evidence for anecdotally reported effects such as memory loss or causing brain tumors. However, there is no way to prove the absolute absence of such effects. The enormous efforts have been made to search for such unknown effects and ascertain the safety of this technology. Recent research on the possible effects of RF-EMF on the brain is briefly summarized here to show what is known and what remains unknown. The evidence reported so far indicates few effects that could possibly damage human health seriously. Only slight changes in physiological function in the brain may exist, but variation of the data is too great to believe that the exposure actually has the potential to affect function. The health risk, if any, at an individual level, would be very low in consideration of the available evidence. However, if mobile phone fields were actually hazardous, the very large number of mobile phone users could mean that, even if the individual risk were very low, the impact on public health could be considerable. This is the most important reason why so many efforts are being made in this issue.

  20. Mobilities

    DEFF Research Database (Denmark)

    simple movements of people, goods, and information from A to B. The ‘mobilities turn’ has made it its hallmark to explore the ‘more than’ effects of a world increasingly on the move. This new title in the Routledge Series ‘Critical Concepts in Built Environment’ creates a state-of-the-art reference work......The world is on the move. This is a widespread understanding by many inhabitants of contemporary society across the Globe. But what does it actually mean? During over one decade the ‘mobilities turn’ within the social sciences have provided a new set of insights into the repercussions of mobilities...... to social networks, personal identities, and our relationship to the built environment. The omnipresence of mobilities within everyday life, high politics, technology, and tourism (to mention but a few) all point to a key insight harnessed by the ‘mobilities turn’. Namely that mobilities is much more than...

  1. Satellite Based Education and Training in Remote Sensing and Geo-Information AN E-Learning Approach to Meet the Growing Demands in India

    Science.gov (United States)

    Raju, P. L. N.; Gupta, P. K.

    2012-07-01

    One of the prime activities of Indian Space Research Organisation's (ISRO) Space Program is providing satellite communication services, viz., television broadcasting, mobile communication, cyclone disaster warning and rescue operations etc. so as to improve their economic conditions, disseminate technical / scientific knowledge to improve the agriculture production and education for rural people of India. ISRO, along with National Aeronautical and Space Administration (NASA) conducted experimental satellite communication project i.e. Satellite Instructional Television Experiment (SITE) using NASA's Advanced Telecommunication Satellite (i.e. ATS 6) with an objective to educate poor people of India via satellite broadcasting in 1975 and 1976, covering more than 2600 villages in six states of India and territories. Over the years India built communication satellites indigenously to meet the communication requirements of India. This has further lead to launch of an exclusive satellite from ISRO for educational purposes i.e. EDUSAT in 2004 through which rich audio-video content is transmitted / received, recreating virtual classes through interactivity. Indian Institute of Remote Sensing (IIRS) established in 1966, a premier institute in south East Asia in disseminating Remote Sensing (RS) and Geographical Information System (GIS), mainly focusing on contact based programs. But expanded the scope with satellite based Distance Learning Programs for Universities, utilizing the dedicated communication satellite i.e. EDUSAT in 2007. IIRS conducted successfully eight Distance Learning Programs in the last five years and training more than 6000 students mainly at postgraduate level from more than 60 universities /Institutions spread across India. IIRS obtained feedback and improved the programs on the continuous basis. Expanded the scope of IIRS outreach program to train user departments tailor made in any of the applications of Remote Sensing and Geoinformation, capacity

  2. Very Low Power Viterbi Decoder Employing Minimum Transition and Exchangeless Algorithms for Multimedia Mobile Communication

    Directory of Open Access Journals (Sweden)

    Prof. S. L. Haridas

    2011-12-01

    Full Text Available A very low power consumption viterbi decoder has been developed by low supply voltage and 0.15 µm CMOS process technology. Significant power reduction can be achieved by modifying the design and implementation of viterbi decoder using conventional techniques traceback and Register Exchange to Hybrid Register Exchange Method (HREM, Minimum Transition Register Exchange Method (MTREM, Minimum Transition Hybrid Register Exchange Method (MTHREM, Register exchangeless Method and Hybrid Register exchangeless Method. By employing the above said schemes such as, HREM, MTREM, MTHREM, Register exchangeless Method and Hybrid Register exchangeless Method; the viterbi decoder achieves a drastic reduction in power consumption below 100 µW at a supply voltage of 1.62 V when the data rate of 5 Mb/s and the bit error rate is less than 10-3. This excellent performance has been paved the way to employing the strong forward error correction and low power consumption portable terminals for personnel communication, mobile multimedia communication and digital audio broadcasting. Implementation insight and general conclusions can particularly benefit from this approach are given.

  3. Inquiring the niche determinants of social media websites in dynamically mobile hypercompetitive communication era

    Directory of Open Access Journals (Sweden)

    Chih-Cheng Huang

    2016-03-01

    Full Text Available This research cross-employs the information communication distribution transaction and analytic network process models to effectively institute the hierarchical evaluated model and utilizes, in specific, fuzzy theory and the grey relation analysis approaches of multiple criteria decision-making methodology into the weight measurements of expert’s questionnaires from three analytical perspectives (user’s satisfaction, corporate commitment, and social trust of relationship quality in order to explore the niche determinants of the social media websites in the contemporarily hypercompetitive and dynamic online era. Consequently, as for the measured consequences after a series of complicated and systematical calculations, the most valuable findings in this research are (1 the technological interfaces of social media websites is a positive niche in the dynamically mobile hypercompetitive communication era and (2 the “social media websites” is in a position of becoming one of the social media mainstreams in the online technology field based on the measured weights from the detailed survey data collected from experts in this research.

  4. Multi-spectral band selection for satellite-based systems

    Energy Technology Data Exchange (ETDEWEB)

    Clodius, W.B.; Weber, P.G.; Borel, C.C.; Smith, B.W.

    1998-09-01

    The design of satellite based multispectral imaging systems requires the consideration of a number of tradeoffs between cost and performance. The authors have recently been involved in the design and evaluation of a satellite based multispectral sensor operating from the visible through the long wavelength IR. The criteria that led to some of the proposed designs and the modeling used to evaluate and fine tune the designs will both be discussed. These criteria emphasized the use of bands for surface temperature retrieval and the correction of atmospheric effects. The impact of cost estimate changes on the final design will also be discussed.

  5. 基于Internet的第四代移动通信系统%The Internet-Based Fourth Generation Mobile Communication System

    Institute of Scientific and Technical Information of China (English)

    顾志松; 黄允中; 张世永

    2003-01-01

    This paper generalizes the previous mobile communication systems from the first generation to the thirdgeneration, and presents the requirements of the future fourth generation mobile communication system (4G). Thenthe Internet-based 4G system is presented, which breaks through the close structure of the traditional ones. Finally,the key technologies of the Internet-based 4G system are discussed.

  6. Reducing interferences in wireless communication systems by mobile agents with recurrent neural networks-based adaptive channel equalization

    Science.gov (United States)

    Beritelli, Francesco; Capizzi, Giacomo; Lo Sciuto, Grazia; Napoli, Christian; Tramontana, Emiliano; Woźniak, Marcin

    2015-09-01

    Solving channel equalization problem in communication systems is based on adaptive filtering algorithms. Today, Mobile Agents (MAs) with Recurrent Neural Networks (RNNs) can be also adopted for effective interference reduction in modern wireless communication systems (WCSs). In this paper MAs with RNNs are proposed as novel computing algorithms for reducing interferences in WCSs performing an adaptive channel equalization. The method to provide it is so called MAs-RNNs. We perform the implementation of this new paradigm for interferences reduction. Simulations results and evaluations demonstrates the effectiveness of this approach and as better transmission performance in wireless communication network can be achieved by using the MAs-RNNs based adaptive filtering algorithm.

  7. Mobile communication and network privatism: A literature review of the implications for diverse, weak, and new ties

    Directory of Open Access Journals (Sweden)

    Scott W. Campbell

    2015-01-01

    Full Text Available Most of the research on the implications of mobile communication for social networks has focused on its uses and consequences in the intimate realm of close friends, family, and loved ones. A number of scholars have also become interested in ways that mobile communication helps and hinders the broader realm of network connectivity, including diverse, weak, and new ties. A collection of theoretical perspectives on mobile communication and diverse, weak, and new ties proposes that heightened connectivity in the intimate realm can come at the expense of being engaged more broadly – a scenario I characterize as network privatism. At the same time, the available empirical research in the literature tends to tell a different story, or rather stories. This analysis brings theory and empirical findings into closer conversation with one another by reviewing and synthesizing the literature in this area. Observed patterns in the literature offer new insight into questions of mobile communication and network privatism, while also pointing to opportunities for refinement of theory, analysis, and measurement as this line of inquiry further develops.

  8. Design and Implement of the Anonymous Communications in the Mobile IP Networks%移动IP中通信匿名技术的设计与实现

    Institute of Scientific and Technical Information of China (English)

    康凯; 郭伟; 吴诗其

    2002-01-01

    One of the key problems in the mobile communication is the anonymous communication. The mobile userwants to hide his real identifying information to the visiting domain and the public network which he does not trust,and prevent from being tracked and located. In this paper, we have discoursed the anonymous communications in themobile IP, and presented a novel strategy of the dynamic address allocation and the routing with anonymity. The sug-gested method enables any identifying information can be carried over the anonymous and secure connections, andprovide end-to-end security. The implements of the mobile host and the mobile subnet are also presented.

  9. Feasibility and usability of a home monitoring concept based on mobile phones and near field communication (NFC) technology.

    Science.gov (United States)

    Morak, Jürgen; Kollmann, Alexander; Schreier, Günter

    2007-01-01

    Utilization of mobile information and communication technologies in home monitoring applications is becoming more and more common. The mobile phone, acting as a patient terminal for patients suffering from chronic diseases, provides an active link to the caregiver to transmit health status information and receive feedback. In such a concept the usability is still limited by the necessity of entering the values via the mobile phone's small keypad. The near field communication technology (NFC), a touch-based wireless interface that became available recently, may improve the usability level of such applications significantly. The focus of this paper is to describe the development of a prototype application based on this technology embedded in a home monitoring system. The feasibility and usability of this approach are evaluated and compared with concepts used in previous approaches. The high quantifier with respect to overall usability indicates that NFC may be the technology of choice for some tasks in home monitoring applications.

  10. Satellite-based technology, systems testing of fishing vessels: Newfoundland Region (1997) = Essais de systèmes de satellites pour les bateaux de pêche : règion de Terre-Neuve (1997)

    National Research Council Canada - National Science Library

    1998-01-01

    The application of satellite-based technology for monitoring fishing vessels and fishing activity is an effective management tool, permitting two-way communication and electronic tracking and reporting...

  11. 77 FR 28797 - Redundancy of Communications Systems: Backup Power Private Land Mobile Radio Services: Selection...

    Science.gov (United States)

    2012-05-16

    ..., Communications common carriers, Communications equipment, Radio, Telecommunications, Telephone, Television... From the Federal Register Online via the Government Publishing Office FEDERAL COMMUNICATIONS COMMISSION 47 CFR Parts 12 and 90 Redundancy of Communications Systems: Backup Power Private Land...

  12. The iPad and mobile technology revolution: benefits and challenges for individuals who require augmentative and alternative communication.

    Science.gov (United States)

    McNaughton, David; Light, Janice

    2013-06-01

    The iPad and other mobile technologies provide powerful new tools to potentially enhance communication for individuals with developmental disabilities, acquired neurogenic disorders, and degenerative neurological conditions. These mobile technologies offer a number of potential benefits, including: (a) increased awareness and social acceptance of augmentative and alternative communication (AAC), (b) greater consumer empowerment in accessing AAC solutions, (c) increased adoption of AAC technologies, (d) greater functionality and interconnectivity, and (e) greater diffusion of AAC research and development. However, there remain a number of significant challenges that must be addressed if these benefits are to be fully realized: (a) to ensure the focus is on communication, not just technology, (b) to develop innovative models of AAC service delivery to ensure successful outcomes, (c) to ensure ease of access for all individuals who require AAC, and, (d) to maximize AAC solutions to support a wide variety of communication functions. There is an urgent need for effective collaboration among key stakeholders to support research and development activities, and to ensure the successful implementation of mobile technologies to enhance communication outcomes for individuals who require AAC and their families.

  13. Satellite based wind resource assessment over the South China Sea

    DEFF Research Database (Denmark)

    Badger, Merete; Astrup, Poul; Hasager, Charlotte Bay

    2014-01-01

    modeling to develop procedures and best practices for satellite based wind resource assessment offshore. All existing satellite images from the Envisat Advanced SAR sensor by the European Space Agency (2002-12) have been collected over a domain in the South China Sea. Wind speed is first retrieved from...

  14. Tailored Communication Within Mobile Apps for Diabetes Self-Management: A Systematic Review.

    Science.gov (United States)

    Holmen, Heidi; Wahl, Astrid Klopstad; Cvancarova Småstuen, Milada; Ribu, Lis

    2017-06-23

    The prevalence of diabetes is increasing and with the requirements for self-management and risk of late complications, it remains a challenge for the individual and society. Patients can benefit from support from health care personnel in their self-management, and the traditional communication between patients and health care personnel is changing. Smartphones and apps offer a unique platform for communication, but apps with integrated health care personnel communication based on patient data are yet to be investigated to provide evidence of possible effects. Our goal was to systematically review studies that aimed to evaluate integrated communication within mobile apps for tailored feedback between patients with diabetes and health care personnel in terms of (1) study characteristics, (2) functions, (3) study outcomes, (4) effects, and (5) methodological quality. A systematic literature search was conducted following our International Prospective Register of Systematic Reviews (PROSPERO) protocol, searching for apps with integrated communication for persons with diabetes tested in a controlled trial in the period 2008 to 2016. We searched the databases PubMed, Medical Literature Analysis and Retrieval System Online (MEDLINE), Cumulative Index to Nursing and Allied Health Literature (CINAHL), Cochrane Central, Excerpta Medica database (EMBASE), ClinicalTrials.gov, and the World Health Organization (WHO) International Clinical Trials Registry Platform. The search was closed in September 2016. Reference lists of primary articles and review papers were assessed. The Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines were followed, and we applied the Cochrane risk of bias tool to assess methodological quality. We identified 2822 citations and after duplicate removal, we assessed 1128 citations. A total of 6 papers were included in this systematic review, reporting on data from 431 persons participating in small trials of short

  15. Mobile Learning Using Mobile Phones

    Science.gov (United States)

    Vicente, Paula

    2013-01-01

    The participation in mobile learning programs is conditioned by having/using mobile communication technology. Those who do not have or use such technology cannot participate in mobile learning programs. This study evaluates who are the most likely participants of mobile learning programs by examining the demographic profile and mobile phone usage…

  16. Dual-Stack Single-Radio Communication Architecture for UAV Acting As a Mobile Node to Collect Data in WSNs

    Science.gov (United States)

    Sayyed, Ali; Medeiros de Araújo, Gustavo; Bodanese, João Paulo; Buss Becker, Leandro

    2015-01-01

    The use of mobile nodes to collect data in a Wireless Sensor Network (WSN) has gained special attention over the last years. Some researchers explore the use of Unmanned Aerial Vehicles (UAVs) as mobile node for such data-collection purposes. Analyzing these works, it is apparent that mobile nodes used in such scenarios are typically equipped with at least two different radio interfaces. The present work presents a Dual-Stack Single-Radio Communication Architecture (DSSRCA), which allows a UAV to communicate in a bidirectional manner with a WSN and a Sink node. The proposed architecture was specifically designed to support different network QoS requirements, such as best-effort and more reliable communications, attending both UAV-to-WSN and UAV-to-Sink communications needs. DSSRCA was implemented and tested on a real UAV, as detailed in this paper. This paper also includes a simulation analysis that addresses bandwidth consumption in an environmental monitoring application scenario. It includes an analysis of the data gathering rate that can be achieved considering different UAV flight speeds. Obtained results show the viability of using a single radio transmitter for collecting data from the WSN and forwarding such data to the Sink node. PMID:26389911

  17. Dual-Stack Single-Radio Communication Architecture for UAV Acting As a Mobile Node to Collect Data in WSNs.

    Science.gov (United States)

    Sayyed, Ali; de Araújo, Gustavo Medeiros; Bodanese, João Paulo; Becker, Leandro Buss

    2015-09-16

    The use of mobile nodes to collect data in a Wireless Sensor Network (WSN) has gained special attention over the last years. Some researchers explore the use of Unmanned Aerial Vehicles (UAVs) as mobile node for such data-collection purposes. Analyzing these works, it is apparent that mobile nodes used in such scenarios are typically equipped with at least two different radio interfaces. The present work presents a Dual-Stack Single-Radio Communication Architecture (DSSRCA), which allows a UAV to communicate in a bidirectional manner with a WSN and a Sink node. The proposed architecture was specifically designed to support different network QoS requirements, such as best-effort and more reliable communications, attending both UAV-to-WSN and UAV-to-Sink communications needs. DSSRCA was implemented and tested on a real UAV, as detailed in this paper. This paper also includes a simulation analysis that addresses bandwidth consumption in an environmental monitoring application scenario. It includes an analysis of the data gathering rate that can be achieved considering different UAV flight speeds. Obtained results show the viability of using a single radio transmitter for collecting data from the WSN and forwarding such data to the Sink node.

  18. Dual-Stack Single-Radio Communication Architecture for UAV Acting As a Mobile Node to Collect Data in WSNs

    Directory of Open Access Journals (Sweden)

    Ali Sayyed

    2015-09-01

    Full Text Available The use of mobile nodes to collect data in a Wireless Sensor Network (WSN has gained special attention over the last years. Some researchers explore the use of Unmanned Aerial Vehicles (UAVs as mobile node for such data-collection purposes. Analyzing these works, it is apparent that mobile nodes used in such scenarios are typically equipped with at least two different radio interfaces. The present work presents a Dual-Stack Single-Radio Communication Architecture (DSSRCA, which allows a UAV to communicate in a bidirectional manner with a WSN and a Sink node. The proposed architecture was specifically designed to support different network QoS requirements, such as best-effort and more reliable communications, attending both UAV-to-WSN and UAV-to-Sink communications needs. DSSRCA was implemented and tested on a real UAV, as detailed in this paper. This paper also includes a simulation analysis that addresses bandwidth consumption in an environmental monitoring application scenario. It includes an analysis of the data gathering rate that can be achieved considering different UAV flight speeds. Obtained results show the viability of using a single radio transmitter for collecting data from the WSN and forwarding such data to the Sink node.

  19. Performance of joint dual links dynamic power control and smart antenna for TDMA/TDD cellular mobile communications

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    Interference cancellation is made available by using smart antenna at cellular base stations. Well-distribut ed cumulative probability of signal-to-interference plus noise power ratio appears to be vital for cellular mobile multi media communications. A scenario of dual links dynamic power control combined to a solution of smart antenna is pro posed to adjust the instant transmission power in terms of the disparity from the favorite range. Simulation results show that this method is quite effective to improve the cumulative distribution probability performance. Meanwhile, accom panying low power consumption is also obtained at both base stations and mobile stations.

  20. Real-Time Mobile Communication of Power Requirements for Electric Vehicles

    Directory of Open Access Journals (Sweden)

    Derek Smith

    2012-12-01

    Full Text Available The periodic power requirements of an electric vehicle are difficult to predict because the vehicle's location, the amount of charge remaining in its batteries, and the timing of its next charge are not known. For clusters of electric vehicles, the problem is magnified, and there is a risk that the demand will strain and overload a power utility’s infrastructure. Operational managers are left with reactive management of the infrastructure that may defer or prevent a vehicle charge to balance power demands and safeguard the infrastructure. In this article, the following key concepts are analyzed to provide background on the problem and to outline the requirements of any solution: i demand uncertainty and reactive management approaches, ii electric vehicle power requirements, and iii demand-management telecommunication capabilities. Then, by abstraction, induction, and creative synthesis, a novel solution to the problem is proposed to provide real-time mobile communication of power requirements. The proposed solution has potential to create new service and business opportunities to managers and entrepreneurs.

  1. A new coherent demodulation technique for land-mobile satellite communications

    Science.gov (United States)

    Yoshida, Shousei; Tomita, Hideho

    1990-01-01

    An advanced coherent demodulation technique is described for land mobile satellite (LMS) communications. The proposed technique features a combined narrow/wind band dual open loop carrier phase estimator, which is effectively able to compensate the fast carrier phase fluctuation by fading with sacrificing a phase slip rate. Also included is the realization of quick carrier and clock reacquisition after shadowing by taking open loop structure. Its bit error rate (BER) performance is superior to that of existing detection schemes, showing a BER of 1 x 10(exp -2) at 6.3 dB E sub b/N sub o over the Rician channel with 10 dB C/M and 200 Hz (1/16 modulation rate) fading pitch f sub d for QPSK. The proposed scheme consists of a fast response carrier recovery and a quick bit timing recovery with an interpolation. An experimental terminal model was developed to evaluate its performance at fading conditions. The results are quite satisfactory, giving prospects for future LMS applications.

  2. SACA: Self-Aware Communication Architecture for IoT Using Mobile Fog Servers

    Directory of Open Access Journals (Sweden)

    Vishal Sharma

    2017-01-01

    Full Text Available Internet of things (IoT aims at bringing together large business enterprise solutions and architectures for handling the huge amount of data generated by millions of devices. For this aim, IoT is necessary to connect various devices and provide a common platform for storage and retrieval of information without fail. However, the success of IoT depends on the novelty of network and its capability in sustaining the increasing demand by users. In this paper, a self-aware communication architecture (SACA is proposed for sustainable networking over IoT devices. The proposed approach employs the concept of mobile fog servers which make relay using the train and unmanned aerial vehicle (UAV networks. The problem is presented based on Wald’s maximum model, which is resolved by the application of a distributed node management (DNM system and state dependency formulations. The proposed approach is capable of providing prolonged connectivity by increasing the network reliability and sustainability even in the case of failures. The effectiveness of the proposed approach is demonstrated through numerical and network simulations in terms of significant gains attained with lesser delay and fewer packet losses. The proposed approach is also evaluated against Sybil, wormhole, and DDoS attacks for analyzing its sustainability and probability of connectivity in unfavorable conditions.

  3. Design and analysis of the optical transceiver for mobile atmospheric laser communication

    Institute of Scientific and Technical Information of China (English)

    Dongtang Ma(马东堂); Jibo Wei(魏急波); Zhaowen Zhuang(庄钊文); Tao Wen(温涛)

    2003-01-01

    The concept of mobile atmospheric laser communication (MALC) is introduced in this paper. Atmosphericattenuation, turbulence-induced scintillation and beam wander cause deep fades in the beam power anddegrade the optical channel. The optical transceiver presented in this paper is designed for a MALC testsystem. Currently achievable hardware performance capabilities for the MALC terminals are used as inputparameters to the analysis. A novel optical transceiver structure is designed. Link margin is analyzed usingthe MALC analysis software, our optical link analysis program. Data rate, bit-error rate, prime transmitpower requirements, optical link margin, pulse width, background signal, aperture quality and atmosphericeffects drive the optical transmitter requirements. Results are displayed as required aperture size, aperturenumber and the spacing between apertures for a given range and terminal moving speed. The aperturesize is parameterized by data rate, transmitting optical power and wavelength. Si-APD and CCD areselected as the main receive detectors. The receiver aperture, detector size (diameter), receiver speed andsensitivity are the main factors to consider in the design of the receiver.

  4. STUDY ON BEIJING'S EMERGING MOBILE COMMUNICATION INDUSTRIAL CLUSTER AND ITS POLICY IMPLICATIONS

    Institute of Scientific and Technical Information of China (English)

    SUN Tie-shan; LI Guo-ping; LU Ming-hua

    2003-01-01

    This paper is a preliminary and illustrative case study of Beijing's emerging mobile communication industri-al (MCI) cluster, which helps understand the cluster by qualitative analysis and description. Beijing's MCI cluster is emerg-ing as far as the competence of the industry and its spatial concentration are concerned, although it is not the type of thecluster described by PORTER due to the low competence of indigenous firms. The formation of the cluster can be ex-plained by means of the factor and demand conditions of Beijing. However, it is mostly determined by the multinationalsthat promote the growth of the industry and the formation of the cluster, and by the government that also plays a key rolein many ways. As a matter of fact, the interaction between the multinationals and the local government is the key to under-standing the formation of the cluster. Allinall, Beijing's emerging MCI cluster is a value-chain, geographicallyconcentrat-ed but non-localized cluster, which is highly dominated by the multinationals and the local government. Its special character-istics bear some policy implications as to the change of the roles of the local government and the localization of multination-als, etc.

  5. [Metabolic changes in cells under electromagnetic radiation of mobile communication systems].

    Science.gov (United States)

    Iakimenko, I L; Sidorik, E P; Tsybulin, A S

    2011-01-01

    Review is devoted to the analysis of biological effects of microwaves. The results of last years' researches indicated the potential risks of long-term low-level microwaves exposure for human health. The analysis of metabolic changes in living cells under the exposure of microwaves from mobile communication systems indicates that this factor is stressful for cells. Among the reproducible effects of low-level microwave radiation are overexpression of heat shock proteins, an increase of reactive oxygen species level, an increase of intracellular Ca2+, damage of DNA, inhibition of DNA reparation, and induction of apoptosis. Extracellular-signal-regulated kinases ERK and stress-related kinases p38MAPK are involved in metabolic changes. Analysis of current data suggests that the concept of exceptionally thermal mechanism of biological effects of microwaves is not correct. In turn, this raises the question of the need to revaluation of modern electromagnetic standards based on thermal effects of non-ionizing radiation on biological systems.

  6. Getting MANETs to Communicate Efficiently: An Analysis of Mobile Ad Hoc Network Routing Schemes in Tactical Communications

    Science.gov (United States)

    2013-06-01

    of the information technology developments that the Marine Corps is currently studying. Mobile Ad Hoc Networks ( MANETs ) are infrastructureless, highly...supports Marine Corps tactical units will continuously undergo changes based on developments in information technology. Mobile Ad Hoc Networking is one...edge. There are many challenges to MANET implementation however, including management of the dynamic physical topology, and the efficient use of limited

  7. Efficient eNB inter-communication scheme in converged mobile and NG-PON2 system

    Science.gov (United States)

    Xiao, Simiao; Sun, Xiao; Zhang, Kaibin

    2016-02-01

    In LTE, a new X2-interface is defined to facilitate direct communication between neighboring eNBs. Since LTE is an all-IP network, the X2-interface traffic currently needs to be routed and transponded in L3 at the edge router by IP addressing. As mobile data increases, it is a promising trend to backhaul mobile services based on PON. In this paper, an effective approach for eNB inter-communication over TWDM-PON is proposed. By associating the IP address of eNB and the MAC address of ONU, the "inter-eNB communication in L3" can be mapped into "inter-ONU communication in L2" and transponded via the protocol of PON at the OLT. Thus, fast and cost-effective eNB inter-communication can be realized based on TWDM-PON within one wavelength channel and between different wavelength channels. The increasing data traffic pressure to the core network can also be alleviated.

  8. Smartphone-Centric Wi-Fi Device-to-Device Sensor Communication for User Mobility in AAL Services

    OpenAIRE

    Wåhslén, Jonas; Lindh, Thomas

    2016-01-01

    This paper evaluates a use-case for smartphone-centric Wi-Fi device-to-device sensor communication that enables user mobility in ambient assisted living (AAL) services. A real-time performance measurement method has been developed and implemented to evaluate the smartphone’s ability to act as a hub and gateway for Wi-Fi connected sensor nodes. The results show that Wi-Fi Direct and Wi-Fi Hotspot are feasible solutions for smartphone-centric device-to-device communication that enables user mob...

  9. Very low power consumption Viterbi decoder LSIC employing the SST (Scarce State Transition) scheme for multimedia mobile communications

    Science.gov (United States)

    Seki, K.; Kubota, S.; Mizoguchi, M.; Kato, S.

    1994-04-01

    A very low power consumption Viterbi decoder LSIC has been developed by using a low supply voltage 0.8 micron CMOS master slice process technology. By employing the scarce state transition (SST) scheme, this LSIC achieves a drastic reduction in power consumption below 600 mu W at a supply voltage of IV when the data rate is 1152 kbit/s and the bit error rate is less than 10(exp - 3). This excellent performance has paved the way to employing the strong forward error correction and low power consumption portable terminals for personal communications, mobile multimedia communications, and digital and audio broadcasting.

  10. Global trends in satellite-based emergency mapping.

    Science.gov (United States)

    Voigt, Stefan; Giulio-Tonolo, Fabio; Lyons, Josh; Kučera, Jan; Jones, Brenda; Schneiderhan, Tobias; Platzeck, Gabriel; Kaku, Kazuya; Hazarika, Manzul Kumar; Czaran, Lorant; Li, Suju; Pedersen, Wendi; James, Godstime Kadiri; Proy, Catherine; Muthike, Denis Macharia; Bequignon, Jerome; Guha-Sapir, Debarati

    2016-07-15

    Over the past 15 years, scientists and disaster responders have increasingly used satellite-based Earth observations for global rapid assessment of disaster situations. We review global trends in satellite rapid response and emergency mapping from 2000 to 2014, analyzing more than 1000 incidents in which satellite monitoring was used for assessing major disaster situations. We provide a synthesis of spatial patterns and temporal trends in global satellite emergency mapping efforts and show that satellite-based emergency mapping is most intensively deployed in Asia and Europe and follows well the geographic, physical, and temporal distributions of global natural disasters. We present an outlook on the future use of Earth observation technology for disaster response and mitigation by putting past and current developments into context and perspective.

  11. Global trends in satellite-based emergency mapping

    Science.gov (United States)

    Voigt, Stefan; Giulio-Tonolo, Fabio; Lyons, Josh; Kučera, Jan; Jones, Brenda; Schneiderhan, Tobias; Platzeck, Gabriel; Kaku, Kazuya; Hazarika, Manzul Kumar; Czaran, Lorant; Li, Suju; Pedersen, Wendi; James, Godstime Kadiri; Proy, Catherine; Muthike, Denis Macharia; Bequignon, Jerome; Guha-Sapir, Debarati

    2016-01-01

    Over the past 15 years, scientists and disaster responders have increasingly used satellite-based Earth observations for global rapid assessment of disaster situations. We review global trends in satellite rapid response and emergency mapping from 2000 to 2014, analyzing more than 1000 incidents in which satellite monitoring was used for assessing major disaster situations. We provide a synthesis of spatial patterns and temporal trends in global satellite emergency mapping efforts and show that satellite-based emergency mapping is most intensively deployed in Asia and Europe and follows well the geographic, physical, and temporal distributions of global natural disasters. We present an outlook on the future use of Earth observation technology for disaster response and mitigation by putting past and current developments into context and perspective.

  12. Global trends in satellite-based emergency mapping

    Science.gov (United States)

    Voigt, Stefan; Giulio-Tonolo, Fabio; Lyons, Josh; Kučera, Jan; Jones, Brenda; Schneiderhan, Tobias; Platzeck, Gabriel; Kaku, Kazuya; Hazarika, Manzul Kumar; Czaran, Lorant; Li, Suju; Pedersen, Wendi; James, Godstime Kadiri; Proy, Catherine; Muthike, Denis Macharia; Bequignon, Jerome; Guha-Sapir, Debarati

    2016-07-01

    Over the past 15 years, scientists and disaster responders have increasingly used satellite-based Earth observations for global rapid assessment of disaster situations. We review global trends in satellite rapid response and emergency mapping from 2000 to 2014, analyzing more than 1000 incidents in which satellite monitoring was used for assessing major disaster situations. We provide a synthesis of spatial patterns and temporal trends in global satellite emergency mapping efforts and show that satellite-based emergency mapping is most intensively deployed in Asia and Europe and follows well the geographic, physical, and temporal distributions of global natural disasters. We present an outlook on the future use of Earth observation technology for disaster response and mitigation by putting past and current developments into context and perspective.

  13. Compact, low profile antennas for MSAT and mini-M and Std-M land mobile satellite communications

    Science.gov (United States)

    Strickland, P. C.

    1995-01-01

    CAL Corporation has developed a new class of low profile radiating elements for use in planar phased array antennas. These new elements have been used in the design of a low cost, compact, low profile antenna unit for MSAT and INMARSAT Mini-M land mobile satellite communications. The antenna unit which measures roughly 32 cm in diameter by 5 cm deep incorporates a compact LNA and diplexer unit as well as a complete, low cost, beam steering system. CAL has also developed a low profile antenna unit for INMARSAT-M land mobile satellite communications. A number of these units, which utilize a microstrip patch array design, were put into service in 1994.

  14. APPLICATION OF VISION METROLOGY TO IN-ORBIT MEASUREMENT OF LARGE REFLECTOR ONBOARD COMMUNICATION SATELLITE FOR NEXT GENERATION MOBILE SATELLITE COMMUNICATION

    Directory of Open Access Journals (Sweden)

    M. Akioka

    2016-06-01

    Full Text Available Satellite for next generation mobile satellite communication service with small personal terminal requires onboard antenna with very large aperture reflector larger than twenty meters diameter because small personal terminal with lower power consumption in ground base requires the large onboard reflector with high antenna gain. But, large deployable antenna will deform in orbit because the antenna is not a solid dish but the flexible structure with fine cable and mesh supported by truss. Deformation of reflector shape deteriorate the antenna performance and quality and stability of communication service. However, in case of digital beam forming antenna with phased array can modify the antenna beam performance due to adjustment of excitation amplitude and excitation phase. If we can measure the reflector shape precisely in orbit, beam pattern and antenna performance can be compensated with the updated excitation amplitude and excitation phase parameters optimized for the reflector shape measured every moment. Softbank Corporation and National Institute of Information and Communications Technology has started the project "R&D on dynamic beam control technique for next generation mobile communication satellite" as a contracted research project sponsored by Ministry of Internal Affairs and Communication of Japan. In this topic, one of the problem in vision metrology application is a strong constraints on geometry for camera arrangement on satellite bus with very limited space. On satellite in orbit, we cannot take many images from many different directions as ordinary vision metrology measurement and the available area for camera positioning is quite limited. Feasibility of vision metrology application and general methodology to apply to future mobile satellite communication satellite is to be found. Our approach is as follows: 1 Development of prototyping simulator to evaluate the expected precision for network design in zero order and first order

  15. Application of Vision Metrology to In-Orbit Measurement of Large Reflector Onboard Communication Satellite for Next Generation Mobile Satellite Communication

    Science.gov (United States)

    Akioka, M.; Orikasa, T.; Satoh, M.; Miura, A.; Tsuji, H.; Toyoshima, M.; Fujino, Y.

    2016-06-01

    Satellite for next generation mobile satellite communication service with small personal terminal requires onboard antenna with very large aperture reflector larger than twenty meters diameter because small personal terminal with lower power consumption in ground base requires the large onboard reflector with high antenna gain. But, large deployable antenna will deform in orbit because the antenna is not a solid dish but the flexible structure with fine cable and mesh supported by truss. Deformation of reflector shape deteriorate the antenna performance and quality and stability of communication service. However, in case of digital beam forming antenna with phased array can modify the antenna beam performance due to adjustment of excitation amplitude and excitation phase. If we can measure the reflector shape precisely in orbit, beam pattern and antenna performance can be compensated with the updated excitation amplitude and excitation phase parameters optimized for the reflector shape measured every moment. Softbank Corporation and National Institute of Information and Communications Technology has started the project "R&D on dynamic beam control technique for next generation mobile communication satellite" as a contracted research project sponsored by Ministry of Internal Affairs and Communication of Japan. In this topic, one of the problem in vision metrology application is a strong constraints on geometry for camera arrangement on satellite bus with very limited space. On satellite in orbit, we cannot take many images from many different directions as ordinary vision metrology measurement and the available area for camera positioning is quite limited. Feasibility of vision metrology application and general methodology to apply to future mobile satellite communication satellite is to be found. Our approach is as follows: 1) Development of prototyping simulator to evaluate the expected precision for network design in zero order and first order 2) Trial

  16. A Key Re-Distribution and Authentication Based Technique for Secured Communication in Clustered Wireless Sensor Networks with Node Mobility

    Directory of Open Access Journals (Sweden)

    Saswati Mukherjee

    2010-11-01

    Full Text Available Due to application of WSN in mission critical areas, secured message communication is veryimportant. We have attempted to present a methodology that ensures secured communicationamong nodes in a hierarchical Cluster Based WSN. Our scheme works when member sensornodes move from one Cluster Head (CH to another. The proposed scheme is based on Key Redistributionduring node mobility and development of an Authentication Model to checkwhether the new node in a cluster is an intruder. We have carried out extensive simulationexperiments, which demonstrate the efficacy of the proposed scheme. The experiments suggestthat the number of message transmission in creases linearly with the number of mobile nodesduring key-redistribution when a node moves from one CH to another. We have seen that thedetection efficiency of the Authentication Model is 0.9 to 1 when tunable threshold value is 0.02and sensor nodes are sufficiently mobile.

  17. Mobilization

    Science.gov (United States)

    1987-01-01

    istic and romantic emotionalism that typifies this genre. Longino, James C., et al. “A Study of World War Procurement and Industrial Mobilization...States. Harrisburg, PA: Military Service Publishing Co., 1941. CARL 355.22 J72b. Written in rough prose , this World War II era document explains the

  18. 移动网络技术与通讯安全%Mobile Internet Technology and Communication Security

    Institute of Scientific and Technical Information of China (English)

    郑宗晨; 朱振华

    2014-01-01

    The technology of mobile communication and network coalesced to form the mobile internet technology. As this technology grows continually, the roles played in the society increased continually. Since the 21st century, with the research and development of network technology, the demand for communication has increased continually. That makes the combination between mobile communication and network.%移动通信和网络两种技术结合形成了移动通信与网络技术,随着其不断地推广,在社会中起到的作用也在不断的增加。进入21世纪以来,随着网络技术的不断研发,人们对于通信的要求不断增加,通信技术方面也得到了很快的发展,促进了二者的结合。

  19. Design and Implementation of Mobile IPv6 Data Communication in Dual Networks

    Directory of Open Access Journals (Sweden)

    Chaman Singh

    2012-01-01

    Full Text Available Dual Stack Mobile IPv6 is an extension of Mobile IPv6 to support mobility of devices irrespective of IPv4 and IPv6 Networks. This is implemented by combining different modules. IPv4 private networks are behind Network Address Translation (NAT devices. So, to bypass the Binding Update and Binding Acknowledgment by NAT, we need to encapsulate it in User Datagram Protocol (UDP Packets. So, the Dual Stack Mobile IPv6 should support NAT Traversal and Detection. With the support of NAT Detection and Traversal Module in Dual Stack Mobile IPv6, the mobile node is able to move freely from IPv6 Network to IPv4 Network or vice-versa. The main objective of not breaking the connectivity at the time of switching from one network to other is accomplished by NAT Module in Dual Stack Mobile IPv6.

  20. All-digital multicarrier demodulators for on-board processing satellites in mobile communication systems

    Science.gov (United States)

    Yim, Wan Hung

    Economical operation of future satellite systems for mobile communications can only be fulfilled by using dedicated on-board processing satellites, which would allow both cheap earth terminals and lower space segment costs. With on-board modems and codecs, the up-link and down-link can be optimized separately. An attractive scheme is to use frequency-division multiple access/single chanel per carrier (FDMA/SCPC) on the up-link and time division multiplexing (TDM) on the down-link. This scheme allows mobile terminals to transmit a narrow band, low power signal, resulting in smaller dishes and high power amplifiers (HPA's) with lower output power. On the up-link, there are hundreds to thousands of FDM channels to be demodulated on-board. The most promising approach is the use of all-digital multicarrier demodulators (MCD's), where analog and digital hardware are efficiently shared among channels, and digital signal processing (DSP) is used at an early stage to take advantage of very large scale integration (VLSI) implementation. A MCD consists of a channellizer for separation of frequency division multiplexing (FDM) channels, followed by individual modulators for each channel. Major research areas in MCD's are in multirate DSP, and the optimal estimation for synchronization, which form the basis of the thesis. Complex signal theories are central to the development of structured approaches for the sampling and processing of bandpass signals, which are the foundations in both channellizer and demodulator design. In multirate DSP, polyphase theories replace many ad-hoc, tedious and error-prone design procedures. For example, a polyphase-matrix deep space network frequency and timing system (DFT) channellizer includes all efficient filter bank techniques as special cases. Also, a polyphase-lattice filter is derived, not only for sampling rate conversion, but also capable of sampling phase variation, which is required for symbol timing adjustment in all

  1. Prospect of Future Wireless Mobile Communication%未来无线移动通信前瞻

    Institute of Scientific and Technical Information of China (English)

    屠子谦

    2014-01-01

    随着移动通信技术的发展,世界正在变的越来越小,信息的交流也变的更为顺畅,同时人们对无线移动通信的要求也越来越高。目前4G技术已逐步在世界范围内开始部署,这也激励了科技工作者们继续探索未来无线移动通信的技术。未来无线通信的发展必将面临着非常高的移动终端密度和如何提高频谱利用率等一系列问题,如何克服这些问题,将会是未来移动通信的重点。要解决上述问题,文章尝试着从以下几种相互关联的技术中给出答案:小基站技术、设备与设备互联技术、云端无线接入网络技术和无线网络最优接入技术。%With the development of mobile communication technology,the world is becoming smaller and smaller, the exchange of information has become easier and people have higher requirement of mobile communication technology.The scientists and technologists are inspired to continue the research of future wireless mobile communication technology with the deployment of 4G systems all over the world. There will be a lot of problems when people develop the future mobile communication, such as very high device densities and how to improve the spectrum utilization.The key to the future mobile communication will be the technologies which will overcome all these problems.The article is trying to solve these difficulties through these interconnected technologies:Small Cell, Device-to-Device,Cloud-Radio Access Network and Always Best Connected.

  2. R&D of a Next Generation LEO System for Global Multimedia Mobile Satellite Communications

    Science.gov (United States)

    Morikawa, E.; Motoyoshi, S.; Koyama, Y.; Suzuki, R.; Yasuda, Y.

    2002-01-01

    Next-generation LEO System Research Center (NeLS) was formed in the end of 1997 as a research group under the Telecommunications Advancement Organization of Japan, in cooperation with the telecommunications operators, manufacturers, universities and governmental research organization. The aim of this project is to develop new technology for global multimedia mobile satellite communications services with a user data rate around 2Mbps for handy terminals. component of the IMT-2000, and the second generation of the big-LEO systems. In prosecuting this project, two-phase approach, phase 1 and phase 2, is considered. Phase 1 is the system definition and development of key technologies. In Phase 2, we plan to verify the developed technology in Phase 1 on space. From this year we shifted the stage to Phase 2, and are now developing the prototype of on-board communication systems for flight tests, which will be planed at around 2006. The satellite altitude is assumed to be 1200 km in order to reduce the number of satellites, to avoid the Van Allen radiation belts and to increase the minimum elevation angle. Ten of the circular orbits with 55 degree of inclination are selected to cover the earth surface from -70 to 70 degree in latitude. 12 satellites are positioned at regular intervals in each orbit. In this case, the minimum elevation angle from the user terminal can be keep more than 20 degree for the visibility of the satellite, and 15 degree for simultaneous visibility of two satellites. Then, NeLS Research Center was focusing on the development of key technologies as the phase 1 project. Four kinds of key technologies; DBF satellite antenna, optical inter-satellite link system, satellite network technology with on-board ATM switch and variable rate modulation were selected. Satellite Antenna Technology: Development of on-board direct radiating active phased array antenna with digital beam forming technology would be one of the most important breakthroughs for the

  3. Scenario driven requirement engineering for design and deployment of mobile communication networks

    OpenAIRE

    Markendahl, Jan; Mölleryd, Bengt G.; Beckman, Claes; Mäkitalo, Östen

    2011-01-01

    The numbers of users and usage of mobile data service are increasing dramatically due to the introduction of smartphones and mobile broadband dongles. For the next decade the mobile broadband market is expected to grow and reach a level where the average data consumption per user is orders of magnitude greater than today. For the telecom industry it is a magnificent challenge to design and deploy these s high-capacity wireless networks taking into account limitations in cost, energy and radio...

  4. Selective Mobile Communication within a Coverage Area Bounded by Radiating Cables

    Directory of Open Access Journals (Sweden)

    Hatim Behairy

    2015-01-01

    Full Text Available It is often desirable to control mobile phone services in areas where complete silence is either expected or mandatory, including schools, places of worship, hospitals, and prisons. In contrast to conventional techniques, such as jammers or Faraday cages, we present a novel technique to selectively control mobile phone services within a desired area. Our solution enables the area’s keeper to allow mobile phones on a whitelist to freely use mobile services without disruption while denying services to all other mobile phones that are within the boundaries of the desired area to be controlled. Our solution uses a base station controller to identify all mobile devices located within the area to be controlled, while an antenna is placed inside the area to attract all mobile devices in the area to connect to the base station controller. In previous work, we proposed a system that uses directional antennas for the attraction technique. In this work, we show that replacement of the directional antennas with a leaky feeder antenna enables more accurate control of mobile phone services in and around the area to be controlled. Simulations and experiments of the leaky feeder technique confirm its precise control of mobile phone services within the desired areas.

  5. Analysis of Application and Development of Mobile Communications%浅析移动通信的应用及发展

    Institute of Scientific and Technical Information of China (English)

    顾英嘉

    2012-01-01

    Mobile communication refers to the communication between mobile users or between mobiles users and fixed users. As technology advances, particularly semiconductors, integrated circuits and machine technology, mobile communication has been rapid development. The expansion of its applications and increasing of performance requirements prompts the development of the mobile communications technology and theory towards a higher level. Since the 1980s, mobile communication has become one of the fastest means of communication.%移动通信是指移动用户之间,或移动用户与固定用户之间的通信.随着技术的发展,特别是半导体、集成电路和机技术的发展,移动通信得到了迅速的发展.随着其应用领域的扩大和对性能要求的提高,促使移动通信在技术上和理论上向更高水平发展.20世纪80年代以来,移动通信已成为通信网中不可缺少并发展最快的通信方式之一.

  6. Interference of GSM mobile phones with communication between Cardiac Rhythm Management devices and programmers: A combined in vivo and in vitro study.

    Science.gov (United States)

    Huang, Dong; Dong, Zhi-Feng; Chen, Yan; Wang, Fa-Bin; Wei, Zhi; Zhao, Wen-Bin; Li, Shuai; Liu, Ming-Ya; Zhu, Wei; Wei, Meng; Li, Jing-Bo

    2015-07-01

    To investigate interference, and how to avoid it, by high-frequency electromagnetic fields (EMFs) of Global System for Mobile Communications (GSM) mobile phone with communication between cardiac rhythm management devices (CRMs) and programmers, a combined in vivo and in vitro testing was conducted. During in vivo testing, GSM mobile phones interfered with CRM-programmer communication in 33 of 65 subjects tested (50.8%). Losing ventricle sensing was representative in this study. In terms of clinical symptoms, only 4 subjects (0.6%) felt dizzy during testing. CRM-programmer communication recovered upon termination of mobile phone communication. During in vitro testing, electromagnetic interference by high-frequency (700-950 MHz) EMFs reproducibly occurred in duplicate testing in 18 of 20 CRMs (90%). During each interference, the pacing pulse signal on the programmer would suddenly disappear while the synchronous signal was normal on the amplifier-oscilloscope. Simulation analysis showed that interference by radiofrequency emitting devices with CRM-programmer communication may be attributed to factors including materials, excitation source distance, and implant depth. Results suggested that patients implanted with CRMs should not be restricted from using GSM mobile phones; however, CRMs should be kept away from high-frequency EMFs of GSM mobile phone during programming.

  7. Student Perceptions of a Mobile Augmented Reality Game and Willingness to Communicate in Japanese

    Science.gov (United States)

    Shea, Andrea Misao

    2014-01-01

    Communication is a key component in learning a second language (L2). As important as the "ability" to communicate in the L2 is the willingness to use the L2 or, what has been identified in the literature as "Willingness to Communicate" (WTC). Language is best learned when situated in, and based on, real-life experiences.…

  8. Mobile-to-mobile wireless channels

    CERN Document Server

    Zajic, Alenka

    2013-01-01

    Present-day mobile communications systems can be classified as fixed-to-mobile because they allow mobility on only one end (e.g. the mobile phone to a fixed mobile operator's cell tower). In answer to the consumer demand for better coverage and quality of service, emerging mobile-to-mobile (M-to-M) communications systems allow mobile users or vehicles to directly communicate with each other. This practical book provides a detailed introduction to state-of-the-art M-to-M wireless propagation. Moreover, the book offers professionals guidance for rapid implementation of these communications syste

  9. Satellite-aided mobile radio concepts study: Concept definition of a satellite-aided mobile and personal radio communication system

    Science.gov (United States)

    Anderson, R. E.

    1979-01-01

    The satellite system requires the use of a large satellite antenna and spacecraft array power of about 12 kW or more depending on the operating frequency. Technology developments needed include large offset reflector multibeam antennas, satellite electrical power sybsystems providing greater than 12 kW of power, signal switching hardware, and linearized efficient solid state amplifiers for the satellite-aided mobile band. Presently there is no frequency assignment for this service, and it is recommended that an allocation be pursued. The satellite system appears to be within reasonable extrapolation of the state of the art. It is further recommended that the satellite-aided system spacecraft definition studies and supporting technology development be initiated.

  10. Spreading the Load: Mobile Information and Communications Technologies and Their Effect on Information Overload

    Science.gov (United States)

    Allen, David K.; Shoard, M.

    2005-01-01

    Introduction: We report on a small-scale research project which examined the impact of mobile technologies on the users' experience of information overload. The project focused on a group of worker who have had relatively little attention in both the mobile technology and information overload literatures: senior managers. Method: The case study…

  11. Copenhagen as a centre of excellence for mobile and Wireless communication

    DEFF Research Database (Denmark)

    Falch, Morten

    The aim of this paper is to analyze the potential of the Copenhagen capital region to maintain a leading position in development and provision of mobile technologies. The paper presents empirical data on the mobile sector in the capital region in order to identify strengths and weaknesses...

  12. Manufacturing consent?: Media messages in the mobilization against HIV/AIDS in India and lessons for health communication.

    Science.gov (United States)

    Khan, Shamshad

    2014-01-01

    Despite repeated calls for a more critical and "culture-centered" approach to health communication, textual analysis of televised public service advertising (PSA) campaigns has been largely neglected, even by critical communication scholars. In the case of "developing" countries in particular, there is an acute shortage of such literature. On the other hand, following the outbreak of major public health diseases such as AIDS, most countries have adopted PSA campaigns as the most preferred means of communicating messages. Drawing on insights from cultural studies (especially Antonio Gramsci and Stuart Hall), this article engages in textual analysis of the televised PSA campaigns launched by the Indian state to prevent HIV/AIDS between 2002 and 2005. Through such analysis, it argues that although few diseases in Indian history have spurred such massive and creative efforts for mass mobilization as AIDS, these efforts, in terms of their ethical implications, have been far from emancipatory. In fact, they have constructed and perpetuated the logic of domination and control along class, gender, sexuality, and knowledge systems, often contradicting and potentially harming the very goal of HIV prevention and of health promotion and empowerment. This article also holds that assessing public health campaigns through textual analysis, a highly neglected tool in health communication, can shed important light on a far more complex and changing nature of the state and public policy, especially in the developing world, thereby opening up space for alternative theorizing for health communication and social change.

  13. Evaluation Of Geo-Spatial Proximity Of Mobile Communication GSM Base Transceiver Stations To Buildings In Ile-Ife Nigeria

    Directory of Open Access Journals (Sweden)

    Badru

    2015-08-01

    Full Text Available Efficient placement of radio facilities for the communication base transceiver station CBS of the two small global system for mobile communication GSM has being an area of research due to fast growing of GSM market in Nigeria. In line with this development Nigerian Communication Commission NCC and Nigeria Environmental Standard and Regulation Enforcement Agency NESREA have stated the setback between communication base station and the nearest infrastructure as 5 m and 10 m respectively. To evaluate the degree of the implementation of these setbacks in Ile-Ife the study area the research study identified the spatial locations of the CBS using a global communication for satellite GPS receiver and also employed the use of a high resolution satellite imagery which were processed using geo-spatial techniques. The results of this study revealed that 45.6 and 59.5 of the CBS had setback to building structures at 5 m and 10 m respectively with spatial variability between 30 m to 17074 m at elevation between 193 m to 377 m.

  14. Systematic review of the information and communication technology features of web- and mobile-based psychoeducational interventions for depression.

    Science.gov (United States)

    Zhao, Danyang; Lustria, Mia Liza A; Hendrickse, Joshua

    2017-06-01

    To examine the information and communication technology (ICT) features of psychoeducational interventions for depression delivered via the Internet or via mobile technology. Web- and mobile-based psychoeducational intervention studies published from 2004 to 2014 were selected and reviewed by two independent coders. A total of 55 unique studies satisfied the selection criteria. The review revealed a diverse range of ICTs used to support the psychoeducational programs. Most interventions used websites as their main mode of delivery and reported greater use of communication tools compared to effective approaches like tailoring or interactive technologies games, videos, and self-monitoring tools. Many of the studies relied on medium levels of clinician involvement and only a few were entirely self-guided. Programs that reported higher levels of clinician involvement also reported using more communication tools, and reported greater compliance to treatment. Future experimental studies may help unpack the effects of technology features and reveal new ways to automate aspects of clinician input. There is a need to further examine ways ICTs can be optimized to reduce the burden on clinicians whilst enhancing the delivery of proven effective therapeutic approaches. Copyright © 2017 Elsevier B.V. All rights reserved.

  15. The Mobile College Community: A Study of Adult Learners' Adoption and Use of Digital Communication Technologies on the Campuses of Florida's Community Colleges

    Science.gov (United States)

    Weidert, John William

    2012-01-01

    Rapid advancements in technology and the proliferation of mobile communication devices available in the marketplace require that community college administrators and teachers better understand levels of digital communication technology adoption and how adult learners currently use them. Such an understanding is necessary to developing the…

  16. The Mobile College Community: A Study of Adult Learners' Adoption and Use of Digital Communication Technologies on the Campuses of Florida's Community Colleges

    Science.gov (United States)

    Weidert, John William

    2012-01-01

    Rapid advancements in technology and the proliferation of mobile communication devices available in the marketplace require that community college administrators and teachers better understand levels of digital communication technology adoption and how adult learners currently use them. Such an understanding is necessary to developing the…

  17. A medical application integrating remote 3D visualization tools to access picture archiving and communication system on mobile devices.

    Science.gov (United States)

    He, Longjun; Ming, Xing; Liu, Qian

    2014-04-01

    With computing capability and display size growing, the mobile device has been used as a tool to help clinicians view patient information and medical images anywhere and anytime. However, for direct interactive 3D visualization, which plays an important role in radiological diagnosis, the mobile device cannot provide a satisfactory quality of experience for radiologists. This paper developed a medical system that can get medical images from the picture archiving and communication system on the mobile device over the wireless network. In the proposed application, the mobile device got patient information and medical images through a proxy server connecting to the PACS server. Meanwhile, the proxy server integrated a range of 3D visualization techniques, including maximum intensity projection, multi-planar reconstruction and direct volume rendering, to providing shape, brightness, depth and location information generated from the original sectional images for radiologists. Furthermore, an algorithm that changes remote render parameters automatically to adapt to the network status was employed to improve the quality of experience. Finally, performance issues regarding the remote 3D visualization of the medical images over the wireless network of the proposed application were also discussed. The results demonstrated that this proposed medical application could provide a smooth interactive experience in the WLAN and 3G networks.

  18. Mobility management in mobile IP

    Science.gov (United States)

    Medidi, Sirisha; Golshani, Forouzan

    2002-07-01

    There is an emerging interest in integrating mobile wireless communication with the Internet based on the Ipv6 technology. Many issues introduced by the mobility of users arise when such an integration is attempted. This paper addresses the problem of mobility management, i.e., that of tracking the current IP addresses of mobile terminals and sustaining active IP connections as mobiles move. The paper presents some architectural and mobility management options for integrating wireless access to the Internet. We then present performance results for Mobile IPv4, route optimization and Mobile IPv6.

  19. Evaluation of Data Transfer Performance Between Moving Sender and Receiver in Mobile Communication Networks for Heterogeneous Service Support

    Directory of Open Access Journals (Sweden)

    Dalė Dzemydienė

    2013-08-01

    Full Text Available Vehicular communication networks are acquiring more and more commercial relevance because of recent advances in inter-vehicular communications via the DSRC/WAVE standard, which stimulates a brand new family of visionary services for vehicles, from road safety to entertainment and multimedia applications. After deep analysis of the literature it was decided to investigate evaluation of data transfer performance between moving sender and receiver in mobile communication network for heterogeneous service support. After careful analysis of the simulation tools the NCTUns 6.0 software package was chosen for planned investigations. The results illustrate that the longest communication can be maintained at the maximum number of vehicles participating on the network, but the quality of communication is inversely proportional to the number of vehicles. On this changing topology network when growing number of nodes (vehicles increases flooding of network with the data packages and it determines many collisions. The number of rejected packages increases directly in proportion to the number of vehicles. When the number of nodes (vehicle increases—it is increasing the number of the received same packages which are received from different nodes in the recipient node. On the sender node, the packages are rejected because the collisions occur due to improperly functioning access channel allocation mechanisms. It can be concluded that the routing protocols created for a normal MANET networks is useless in a fast-changing topology large-scale vehicle communication network. To provide heterogeneous services new routing protocols and channel access methods are needed, specifically for vehicle communication networks.

  20. Evaluation of Data Transfer Performance Between Moving Sender and Receiver in Mobile Communication Networks for Heterogeneous Service Support

    Directory of Open Access Journals (Sweden)

    Dalė Dzemydienė

    2011-12-01

    Full Text Available Vehicular communication networks are acquiring more and more commercial relevance because of recent advances in inter-vehicular communications via the DSRC/WAVE standard, which stimulates a brand new family of visionary services for vehicles, from road safety to entertainment and multimedia applications. After deep analysis of the literature it was decided to investigate evaluation of data transfer performance between moving sender and receiver in mobile communication network for heterogeneous service support. After careful analysis of the simulation tools the NCTUns 6.0 software package was chosen for planned investigations. The results illustrate that the longest communication can be maintained at the maximum number of vehicles participating on the network, but the quality of communication is inversely proportional to the number of vehicles. On this changing topology network when growing number of nodes (vehicles increases flooding of network with the data packages and it determines many collisions. The number of rejected packages increases directly in proportion to the number of vehicles. When the number of nodes (vehicle increases—it is increasing the number of the received same packages which are received from different nodes in the recipient node. On the sender node, the packages are rejected because the collisions occur due to improperly functioning access channel allocation mechanisms. It can be concluded that the routing protocols created for a normal MANET networks is useless in a fast-changing topology large-scale vehicle communication network. To provide heterogeneous services new routing protocols and channel access methods are needed, specifically for vehicle communication networks.

  1. Field testing of a remote controlled robotic tele-echo system in an ambulance using broadband mobile communication technology.

    Science.gov (United States)

    Takeuchi, Ryohei; Harada, Hiroshi; Masuda, Kohji; Ota, Gen-ichiro; Yokoi, Masaki; Teramura, Nobuyasu; Saito, Tomoyuki

    2008-06-01

    We report the testing of a mobile Robotic Tele-echo system that was placed in an ambulance and successfully transmitted clear real time echo imaging of a patient's abdomen to the destination hospital from where this device was being remotely operated. Two-way communication between the paramedics in this vehicle and a doctor standing by at the hospital was undertaken. The robot was equipped with an ultrasound probe which was remotely controlled by the clinician at the hospital and ultrasound images of the patient were transmitted wirelessly. The quality of the ultrasound images that were transmitted over the public mobile telephone networks and those transmitted over the Multimedia Wireless Access Network (a private networks) were compared. The transmission rate over the public networks and the private networks was approximately 256 Kbps, 3 Mbps respectively. Our results indicate that ultrasound images of far higher definition could be obtained through the private networks.

  2. Brief communication "Application of mobile laser scanning in snow cover profiling"

    Directory of Open Access Journals (Sweden)

    S. Kaasalainen

    2010-11-01

    Full Text Available We present a snowmobile based mobile mapping system and its first application on snow cover roughness and change detection measurement. The ROAMER mobile mapping system, constructed at the Finnish Geodetic Institute, consists of the positioning and navigating systems, a terrestrial laser scanner, and the carrying platform (a snowmobile sledge in this application. We demonstrate the applicability of the instrument in snow cover roughness profiling and change detection by presenting preliminary results from a mobile laser scanning (MLS campaign. The results show the potential of MLS for fast and efficient snow profiling from large areas in a millimetre scale.

  3. Mobile Communication System and Psychology of Audience%手机传播机制与受众文化心理

    Institute of Scientific and Technical Information of China (English)

    夏光富; 李建秋

    2012-01-01

    Mobile communication has gone into people's daily live fully, and the dissemination of "everyone involved in the same time" has basically become cure. Mobile cultural communication shows the communication system of universality and radioactivity, and the interpersonal communication is better. Then mobile communication system has the characteristics of random and diversification, and the maximum use of mobile phones relieves modem people's psychological crisis, also meets the people's desire of diversified communication. Seen from the audiences' requirements of mobile cultural communication, uses and gratifications are the psychological motivation of using mobile media and building mobile phone culture.%手机传播充分进入了人们的日常生活,传播人人同时参与的事实基本实现。手机媒体文化传播显现出普适性、放射性的传播机制,人际传播动能极强,手机媒体传播机制具有“碎片化”传播的随机性与多样化特点.手机的使用最大限度地缓解了现代人的.心理危机,满足了人们多样化交流的欲望。从手机文化传播受众需求来看,使用与满足正是人们使用手机媒体、构筑手机文化的心理动机。

  4. Materials for filtering and frequency control in the next generations of mobile communication systems

    OpenAIRE

    DÉtaint, J.; Schwartzel, J.

    1994-01-01

    A very large development of the mobile radiocommunications is expected to occur in the 15 next years. In the introduction, the most important among the present and future systems are listed and their main characteristics are briefly indicated. The case of the Universal Mobile Telecommunication System (UMTS) presently studied in the European community to enter service in the beginning of the 2000's is particularly discussed since, it is now, the most ambitious project in this field. The equipm...

  5. Demonstration of long-distance hazard-free wearable EEG monitoring system using mobile phone visible light communication.

    Science.gov (United States)

    Rachim, Vega Pradana; Jiang, Yubing; Lee, Hyeon-Seok; Chung, Wan-Young

    2017-01-23

    A wearable electroencephalogram (EEG) is a small mobile device used for long-term brain monitoring systems. Applications of these systems include fatigue monitoring, mental/emotional monitoring, and brain-computer interfaces. However, the usage of wireless wearable EEG systems is limited due to the risks posed by the wireless RF communication radiation in a long-term exposure to the human brain. A novel microwave radiation-free system was developed by integrating visible light communication technology into a wearable EEG device. In this work, we investigated the system's performance in transmitting EEG data at different illuminance level and proposed an algorithm that functions at low illuminance levels for increased transmission distance. Using a 30 Hz smartphone camera, the proposed system was able to transmit 2.4 kbps of error-free EEG data up to 4 meter, which is equal to ~300 lux using an aspheric focus lens.

  6. 移动通信承载网演进展望%Prospect of Mobile Communication RAN’s Evolution

    Institute of Scientific and Technical Information of China (English)

    刘光

    2013-01-01

    With the development of communication technology and Internet applications,IP is an important characteristic of the future carrying network. This paper briefly introduces the mainstream technology and future evolution direction of current mobile communication network,and the network transformation selection for operators.%随着通信技术及互联网应用的发展,IP化是未来承载网的重要特征,本文简要介绍了目前移动通信承载网主流技术及未来演进方向,各运营商的网络转型选择等,供同行们参考。

  7. 试论人际传播视阈中的手机媒体%Mobile Media under the Perspective of Interpersonal communication

    Institute of Scientific and Technical Information of China (English)

    王燕星

    2011-01-01

    Mobile phone is an important form of interpersonal communication and its relation with human being has become closer. With the development of mobile phone,the content of interpersonal communication has been greatly expanded,to be more interactive and personalized,creating a new way of human communication. In this article,from mobile voice communication,SMS communication and micro-blogging communication,the new features of interpersonal communication of mobile media and the new meaning of individual self-image construction are researched.%手机作为人际传播的一种重要形式,与人类的关系越来越紧密。随着手机技术日新月异的发展,它所承载的人际传播意义内涵有了很大的拓展,越来越体现出互动性、个性化的特点,开创了人际交往的新方式。本文从手机语音传播、手机短信传播、手机微博传播这三个方面入手,研究手机媒体在人际传播视阈中所呈现出的新特质以及对于个体自我形象建构的新意义。

  8. Mobile Health Technology to Communicate Discharge and Follow-Up Information to Adolescents From the Emergency Department.

    Science.gov (United States)

    Ray, Margaret; Dayan, Peter S; Pahalyants, Vartan; Chernick, Lauren S

    2016-12-01

    Adolescents are the largest users of mobile technology; yet, there are little data regarding their receptivity to the use of mobile health technology (mHealth) from the emergency department (ED). The objective of this study was to determine adolescents' preferences for receiving ED discharge and follow-up information via mHealth and factors associated with those preferences. We administered an anonymous self-reporting survey to patients aged 14 to 19 years discharged from an urban pediatric ED. We conducted exploratory bivariate analyses to evaluate differences in communication preferences based on patient characteristics. We used multivariable logistic regression to determine whether preference for health information via mHealth is associated with frequent information technology (IT) use, adjusting for age, sex, ethnicity, and insurance status. Four hundred thirty-nine adolescents completed the survey. Most were female (n = 279, 64%), 14 to 17 years old (n = 247, 57%), Hispanic (n = 359, 86%), and insured (n = 388, 88%). Adolescents used IT often, texting more than 30 times a day (58%) and emailing more than once a day (61%). Most (n = 335, 78%) were interested in electronic communication from the ED. Teens expressed particular interest in using email for discharge instructions (n = 196, 47%), physician referrals (n = 197, 48%), and test results (n = 201, 48%) and using texting for medication (n = 155, 38%) and appointment reminders (n = 170, 41%). Individuals tended to prefer communication with IT modes that they typically used, although only email was independently associated with preference for this mode (adjusted odds ratio, 2.8; 95% confidence interval, 1.5-5.3). Adolescent patients are interested in receiving health information from the ED, mainly via email and texting. Future ED interventions should evaluate the effectiveness of these modalities to communicate with patients after discharge.

  9. Relationships between Emotional States and Emoticons in Mobile Phone Email Communication in Japan

    Science.gov (United States)

    Kato, Shogo; Kato, Yuuki; Scott, Douglass

    2009-01-01

    Three related studies conducted on the role of emotional transfer in email messages were studied in order to better understand Japanese college students' online communications and their broader participation in online communications. The first study investigated users' initiatives in preventing emotional misunderstandings when sending email.…

  10. Communication Moderates Effects of Residential Mobility on Relationship Quality Among Ethnically Diverse Couples.

    Science.gov (United States)

    Nguyen, Teresa P; Williamson, Hannah C; Karney, Benjamin R; Bradbury, Thomas N

    2017-04-13

    Although interpersonal communication is a defining feature of committed relationships, the quality of couple communication has not proven to be a straightforward cause of relationship quality. At the same time, emerging models argue that external circumstances likely combine with communication to generate changes in relationship quality. We integrate these 2 ideas by proposing that communication does exert effects on changes in relationship quality, but primarily when couples encounter challenging situations that require an adaptive response. In the present study we examine residential moves to different neighborhoods as one such adaptive challenge. We conducted a longitudinal study of 414 newlywed couples to examine whether observed communication moderates the effect of moving to higher- or lower-income neighborhoods on changes in relationship quality. Results indicate that communication exerts no main effects on relationship quality. Consistent with the proposed model, however, wives who displayed less positive, less effective, and more negative behaviors experienced greater decreases in relationship quality, but only when couples moved to substantially higher-income neighborhoods. Because communication may not affect relationship quality until couples encounter qualitatively new demands, strengthening relationships may pivot less on improving communication skills and more on ensuring that couples' circumstances do not overwhelm the skills that they already possess. (PsycINFO Database Record (c) 2017 APA, all rights reserved).

  11. Modular, Cost-Effective, Extensible Avionics Architecture for Secure, Mobile Communications

    Science.gov (United States)

    Ivancic, William D.

    2007-01-01

    Current onboard communication architectures are based upon an all-in-one communications management unit. This unit and associated radio systems has regularly been designed as a one-off, proprietary system. As such, it lacks flexibility and cannot adapt easily to new technology, new communication protocols, and new communication links. This paper describes the current avionics communication architecture and provides a historical perspective of the evolution of this system. A new onboard architecture is proposed that allows full use of commercial-off-the-shelf technologies to be integrated in a modular approach thereby enabling a flexible, cost-effective and fully deployable design that can take advantage of ongoing advances in the computer, cryptography, and telecommunications industries.

  12. Communication

    NARCIS (Netherlands)

    Sigafoos, J.; Lancioni, G.E.; O'Reilly, M.F.; Lang, R.; Singh, N.N.; Didden, H.C.M.; Green, V.A.; Marschik, P.B.

    2016-01-01

    Communication disorders are common among people with intellectual disabilities. Consequently, enhancing the communication skills of such individuals is a major intervention priority. This chapter reviews the nature and prevalence of the speech, language, and communication problems associated with

  13. Research on Application of Beidou Technology in Mobile Communications%北斗在移动通信中的应用技术研究

    Institute of Scientific and Technical Information of China (English)

    江华

    2016-01-01

    Multiple applications of Beidou technology in mobile communications were presented, including the time service of Beidou for mobile communication base station system, short message interoperability architecture between Beidou and mobile networks, the navigation of Beidou and mobile integrated terminal and the Beidou indoor precise positioning based on indoor distribution system. With the promotion of Beidou satellite network deployment, the applications of Beidou technology in mobile communications will be more broad and deep to enhance the security and reliability of mobile communication systems.%提出了北斗技术在移动通信中的多种应用,包括北斗为移动通信基站系统授时、北斗系统与移动通信短报文互操作架构、北斗与移动集成终端的导航和基于室内分布系统的北斗室内精确定位技术。随着北斗卫星网络部署进度的推进,北斗技术在移动通信中的应用将越来越广泛和深入,以提升移动通信系统的安全性和可靠性。

  14. Trust models for efficient communication in Mobile Cloud Computing and their applications to e-Commerce

    Science.gov (United States)

    Pop, Florin; Dobre, Ciprian; Mocanu, Bogdan-Costel; Citoteanu, Oana-Maria; Xhafa, Fatos

    2016-11-01

    Managing the large dimensions of data processed in distributed systems that are formed by datacentres and mobile devices has become a challenging issue with an important impact on the end-user. Therefore, the management process of such systems can be achieved efficiently by using uniform overlay networks, interconnected through secure and efficient routing protocols. The aim of this article is to advance our previous work with a novel trust model based on a reputation metric that actively uses the social links between users and the model of interaction between them. We present and evaluate an adaptive model for the trust management in structured overlay networks, based on a Mobile Cloud architecture and considering a honeycomb overlay. Such a model can be useful for supporting advanced mobile market-share e-Commerce platforms, where users collaborate and exchange reliable information about, for example, products of interest and supporting ad-hoc business campaigns

  15. Mobility Prediction Progressive Routing (MP2R), a Cross-Layer Design for Inter-Vehicle Communication

    Science.gov (United States)

    Tang, Suhua; Kadowaki, Naoto; Obana, Sadao

    In this paper we analyze the characteristics of vehicle mobility and propose a novel Mobility Prediction Progressive Routing (MP2R) protocol for Inter-Vehicle Communication (IVC) that is based on crosslayer design. MP2R utilizes the additional gain provided by the directional antennas to improve link quality and connectivity; interference is reduced by the directional transmission. Each node learns its own position and speed and that of other nodes, and performs position prediction. (i) With the predicted progress and link quality, the forwarding decision of a packet is locally made, just before the packet is actually transmitted. In addition the load at the forwarder is considered in order to avoid congestion. (ii) The predicted geographic direction is used to control the beam of the directional antenna. The proposed MP2R protocol is especially suitable for forwarding burst traffic in highly mobile environments. Simulation results show that MP2R effectively reduces Packet Error Ratio (PER) compared with both topology-based routing (AODV [1], FSR [2]) and normal progressive routing (NADV [18]) in the IVC scenarios.

  16. Dynamic Antenna Alignment Control in Microwave Air-Bridging for Sky-Net Mobile Communication Using Unmanned Flying Platform

    Directory of Open Access Journals (Sweden)

    Chin E. Lin

    2015-01-01

    Full Text Available This paper presents a preliminary study on establishing a mobile point-to-point (P2P microwave air-bridging (MAB between Unmanned Low Altitude Flying Platform (ULAFP and backhaul telecommunication network. The proposed Sky-Net system relays telecom signal for general mobile cellphone users via ULAFP when natural disaster sweeps off Base Transceiver Stations (BTSs. Unlike the conventional fix point microwave bridging application, the ULAFP is cruising on a predefined mission flight path to cover a wider range of service. The difficulty and challenge fall on how to maintain antenna alignment accurately in order to provide the signal strength for MAB. A dual-axis rotation mechanism with embedded controller is designed and implemented on airborne and ground units for stabilizing airborne antenna and tracking the moving ULAFP. The MAB link is established in flight tests using the proposed antenna stabilizing/tracking mechanism with correlated control method. The result supports backbone technique of the Sky-Net mobile communication and verifies the feasibility of airborne e-Cell BTS.

  17. A Theory of Secure Mobile Computation with Confined Movement and Communication

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    An extended πcalculus was introduced to deal with secure movement and intercommunication between agents.The system extends Nomadic-πwith objective migration primitive and confined region which serves as annotation labels of agents and channels.the confined region labels were used to uniquely identify the constraints on the migration and communication of agents,with the labels,the agents could be confined in a secure subsystem the migration and communication of agents,with the labels,the agents could be confined in a secure subsystem and the inter-agent communication could be confined between agents located on trusted sites during computation.The operational semantics for the calculus was given out ,and a type system which enforces security properties called confined migration and confined communication was developed.

  18. Validation of the Global NASA Satellite-based Flood Detection System in Bangladesh

    Science.gov (United States)

    Moffitt, C. B.

    2009-12-01

    Floods are one of the most destructive natural forces on earth, affecting millions of people annually. Nations lying in the downstream end of an international river basin often suffer the most damage during flooding and could benefit from the real-time communication of rainfall and stream flow data from countries upstream. This is less likely to happen among developing nations due to a lack of freshwater treaties (Balthrop and Hossain, Water Policy, 2009). A more viable option is for flood-prone developing nations to utilize the global satellite rainfall and modeled runoff data that is independently and freely available from the NASA Satellite-based Global Flood Detection System. Although the NASA Global Flood Detection System has been in operation in real-time since 2006, the ‘detection’ capability of flooding has only been validated against qualitative reports in news papers and other types of media. In this study, a more quantitative validation against in-situ measurements of the flood detection system over Bangladesh is presented. Using ground-measured stream flow data as well as satellite-based flood potential and rainfall data, the study looks into the relationship between rainfall and flood potential, rainfall and stream flow, and stream flow and flood potential for three very distinct river systems in Bangladesh - 1) Ganges- a snow-fed river regulated by upstream India 2) Brahmaputra - a snow-fed river that is also braided 3) Meghna - a rain-fed river. The quantitative assessment will show the effectiveness of the NASA Global Flood Detection System for a very humid and flood prone region like Bangladesh that is also faced with tremendous transboundary hurdles that can only be resolved from the vantage of space.

  19. Application of mobile digital communications in law enforcement, an introductory planning guide

    Science.gov (United States)

    Sohn, R. L.; Abraham, J. E.; Leflang, W. G.; Kennedy, R. D.; Wilson, J. H.; Gurfield, R. M.

    1975-01-01

    A set of planning guidelines for the application of digital communications techniques to law enforcement use is presented. Some essential characteristics of digital techniques and their applications are outlined, as are some principles of system analysis, evaluation, and planning. Requirements analysis, system concept design, implementation planning, and performance and cost modeling are described and demonstrated with respect to this application problem. Information on law enforcement digital communications systems and equipment and a list of vendor sources are given in appendices.

  20. Health hazards of mobile communications and portable telephones; Effetti sulla salute dei telefonini

    Energy Technology Data Exchange (ETDEWEB)

    Foster, K. R. [University of Pennsylvania, Dipt. di Bioingegneria, Pennsylvania (United States); Vecchia, P. [Istituto Superiore di Sanita' , Laboratorio di Fisica, Rome (Italy); Moulder, J.E. [Medical College of Wisconsin, Dipt. di Radiobiologia, Wisconsin (United States)

    2000-08-01

    No epidemiological research has actually significant correlations between brain tumors and mobile telephone utilization. [Italian] Nessuna ricerca epidemiologica ha sinora evidenziato correlazioni significative tra i tumori cerebrali e l'utilizzo dei telefoni cellulari. Ma le controversie sono destinate a proseguire, anche per carenza di adeguata comunicazione con il pubblico.

  1. A super base station based centralized network architecture for 5G mobile communication systems

    Directory of Open Access Journals (Sweden)

    Manli Qian

    2015-04-01

    Full Text Available To meet the ever increasing mobile data traffic demand, the mobile operators are deploying a heterogeneous network with multiple access technologies and more and more base stations to increase the network coverage and capacity. However, the base stations are isolated from each other, so different types of radio resources and hardware resources cannot be shared and allocated within the overall network in a cooperative way. The mobile operators are thus facing increasing network operational expenses and a high system power consumption. In this paper, a centralized radio access network architecture, referred to as the super base station (super BS, is proposed, as a possible solution for an energy-efficient fifth-generation (5G mobile system. The super base station decouples the logical functions and physical entities of traditional base stations, so different types of system resources can be horizontally shared and statistically multiplexed among all the virtual base stations throughout the entire system. The system framework and main functionalities of the super BS are described. Some key technologies for system implementation, i.e., the resource pooling, real-time virtualization, adaptive hardware resource allocation are also highlighted.

  2. A Business Evaluation Of The Next Generation Ipv6 Protocol In Fixed And Mobile Communication Services

    NARCIS (Netherlands)

    L-F. Pau (Louis-François)

    2002-01-01

    textabstractThis paper gives an analytical business model of the Internet IPv4 and IPv6 protocols ,focussing on the business implications of intrinsic technical properties of these protocols .The technical properties modeled in business terms are : address space, payload, autoconfiguration, IP mobil

  3. The Effects of Multimodal Mobile Communications on Cooperative Team Interactions Executing Distributed Tasks

    Science.gov (United States)

    2013-07-01

    Initially, we considered transmitting audio continuously by default, but we decided to incorporate the push-to talk buttons to lower network consumption ...the mobile device’s camera on and is constrained to the camera’s field of view. This “ soda straw” perspective can reduce the Helper’s overall

  4. A method for header compression context control during handover in mobile data communication networks

    NARCIS (Netherlands)

    Karagiannis, Georgios

    2006-01-01

    A method of an equipment for controlling header compression context during handover in a data exchange between a transmitter and a transmitter and a receiver of an IP mobile data network wherein data packets are transferred comprising a header portion and an information portion. The transmitter comp

  5. A method for header compression context control during handover in mobile data communication networks

    NARCIS (Netherlands)

    Karagiannis, Georgios

    2000-01-01

    A method of an equipment for controlling header compression context during handover in a data exchange between a transmitter and a transmitter and a receiver of an IP mobile data network wherein data packets are transferred comprising a header portion and an information portion. The transmitter comp

  6. Towards sustainable mobility behavior: research challenges for location-aware information and communication technology

    NARCIS (Netherlands)

    Weiser, Paul; Scheider, Simon; Bucher, Dominik; Kiefer, Peter; Raubal, Martin

    2016-01-01

    Private transport accounts for a large amount of total CO2 emissions, thus significantly contributing to global warming. Tools that actively support people in engaging in a more sustainable life-style without restricting their mobility are urgently needed. How can location-aware information and comm

  7. Security Scheme Based on Parameter Hiding Technic for Mobile Communication in a Secure Cyber World

    Directory of Open Access Journals (Sweden)

    Jong Hyuk Park

    2016-10-01

    Full Text Available Long Term Evolution (LTE and Long Term Evolution-Advanced (LTE-A support a better data transmission service than 3G dose and are globally commercialized technologies in a cyber world that is essential for constructing a future mobile environment, since network traffics have exponentially increased as people have started to use more than just one mobile device. However, when User Equipment (UE is executing initial attach processes to access LTE networks, there is a vulnerability in which identification parameters like International Mobile Subscriber Identity (IMSI and Radio Network Temporary Identities (RNTI are transmitted as plain texts. It can threat various services that are commercialized therewith in a cyber world. Therefore, a security scheme is proposed in this paper where identification parameters can be securely transmitted and hidden in four cases where initial attach occurs between UE and Mobility Management Entity (MME. The proposed security scheme not only supports encrypted transmission of identification parameters but also mutual authentication between Evolved Node B (eNB and MME to make a secure cyber world. Additionally, performance analysis results using an OPNET simulator showed the satisfaction of the average delay rate that is specified in LTE standards.

  8. Discussion on security of mobile communication network%移动通信传输网络安全性探讨

    Institute of Scientific and Technical Information of China (English)

    赵霞

    2013-01-01

      移动通信传输网络的安全影响到网络用户的切身利益,逐渐成为人们重点关注的对象。随着科学技术的迅速发展,移动通信传输网络也在不断地更新与改善。根据调查研究结果,结合目前移动通信传输网络的发展现状,本文将从移动通信传输网络的发展历史、移动通信传输网络的安全性现状以及移动通信传输网络安全性的影响因素和有效的应对措施三个方面做出详细的分析和探究。%Mobile communication network security affects the vital interests of network users,has gradually become a focus of concern for people.With the rapid development of science and technology,the mobile communication network is constantly updated and improved.According to the survey results,combined with the current development status of mobile communication network,this paper from three aspects of impact factors of mobile communication network development history,the mobile communication transmission network security status and mobile communication network security and effective measures and make analysis and detailed inquiry.

  9. Hardware Design of Wireless Physical Token Ring System for Mobile and Cell Communication

    Directory of Open Access Journals (Sweden)

    Nidal F. Shilbayeh

    2004-01-01

    Full Text Available A wireless network system based on an infrared and Laser scanning Physical Token Ring architecture (W-PTRS was designed, built and tested successfully. The network provides a different way of utilizing the concept of a token ring network but with a higher efficiency related to the speed of data transfer and the ability to parallel process client-server requests leading to a new concept of the token ring system, which will not fail simply because of ring breakage. The study proposes a new wireless communication protocol, which is neither IEEE802.11 nor Bluetooth. This newly developed protocol could prove to be an excellent communication media if supported by industry. If implemented, this wireless system will provide an alternative but efficient way of wireless communication.

  10. Reducing Communication Overhead by Scheduling TCP Transfers on Mobile Devices using Wireless Network Performance Maps

    DEFF Research Database (Denmark)

    Højgaard-Hansen, Kim; Madsen, Tatiana Kozlova; Schwefel, Hans-Peter

    2012-01-01

    The performance of wireless communication networks has been shown to have a strong location dependence. Measuring the performance while having accurate location information available makes it possible to generate performance maps. In this paper we propose a framework for the generation and use...... of such performance maps. We demonstrate how the framework can be used to reduce the retransmissions and to better utilise network resources when performing TCP-based file downloads in vehicular M2M communication scenarios. The approach works on top of a standard TCP stack hence has to map identified transmission...

  11. Connections for the Digital Age Multimedia Communications for Mobile, Nomadic and Fixed Devices

    CERN Document Server

    Carne, E Bryan

    2011-01-01

    Explores and analyzes past and current technologies and trends in multimedia communication Digital natives-those persons born in the digital age-have an ever-widening range of wireless-enabled devices at their disposal. They are the drivers of multimedia communications, continually seeking out the technologies and distribution channels that best match their needs. This book outlines the changes in telecommunications that are occurring to meet these needs. It addresses the continually increasing requirement to provide connections that make the electronic encounter as natural and convenient as p

  12. Analysis of Heterogeneous Mobile Communication Network Security%异构移动通信网络的安全性分析

    Institute of Scientific and Technical Information of China (English)

    卢丹华; 李剑

    2012-01-01

      各种移动通信网络有着特定的需求和应用场景,只有实现各种异构移动网络的无缝融合,才能更好地满足人们对移动通信的需求。文章分析移动通信网络异构性问题及其所面临的安全威胁,最后讨论应对这些安全威胁的异构移动通信网络安全机制。%  A variety of mobile communication networks have specific needs and applications, to meet the people's demand for mobile communication, the seamless integration of heterogeneous mobile networks must be realized. Firstly, the mobile communication network heterogeneity problem and security threats were discussed. Finally, the heterogeneous mobile communication network security mechanisms which response to these security threats was proposed.

  13. Communication: Slow relaxation, spatial mobility gradients, and vitrification in confined films

    Science.gov (United States)

    Mirigian, Stephen; Schweizer, Kenneth S.

    2014-10-01

    Two decades of experimental research indicate that spatial confinement of glass-forming molecular and polymeric liquids results in major changes of their slow dynamics beginning at large confinement distances. A fundamental understanding remains elusive given the generic complexity of activated relaxation in supercooled liquids and the major complications of geometric confinement, interfacial effects, and spatial inhomogeneity. We construct a predictive, quantitative, force-level theory of relaxation in free-standing films for the central question of the nature of the spatial mobility gradient. The key new idea is that vapor interfaces speed up barrier hopping in two distinct, but coupled, ways by reducing near surface local caging constraints and spatially long range collective elastic distortion. Effective vitrification temperatures, dynamic length scales, and mobile layer thicknesses naturally follow. Our results provide a unified basis for central observations of dynamic and pseudo-thermodynamic measurements.

  14. 5G移动通信技术及发展趋势%5G Mobile Communication Technology and Development Trend

    Institute of Scientific and Technical Information of China (English)

    宋文杰

    2015-01-01

    本文首先介绍了5G概念和特点,然后阐述了5G移动通信的关键技术,最后对5G移动通信技术所面临的问题和发展趋势进行了分析.%Firstly, the 5G concept and characteristics were introduced, and then the key technology of 5G mobile communication in detail,fi nally the problems and development trend of 5G mobile communication technology are analyzed.

  15. Multi-purpose HealthCare Telemedicine Systems with mobile communication link support

    Directory of Open Access Journals (Sweden)

    Karayiannis D

    2003-03-01

    Full Text Available Abstract The provision of effective emergency telemedicine and home monitoring solutions are the major fields of interest discussed in this study. Ambulances, Rural Health Centers (RHC or other remote health location such as Ships navigating in wide seas are common examples of possible emergency sites, while critical care telemetry and telemedicine home follow-ups are important issues of telemonitoring. In order to support the above different growing application fields we created a combined real-time and store and forward facility that consists of a base unit and a telemedicine (mobile unit. This integrated system: can be used when handling emergency cases in ambulances, RHC or ships by using a mobile telemedicine unit at the emergency site and a base unit at the hospital-expert's site, enhances intensive health care provision by giving a mobile base unit to the ICU doctor while the telemedicine unit remains at the ICU patient site and enables home telemonitoring, by installing the telemedicine unit at the patient's home while the base unit remains at the physician's office or hospital. The system allows the transmission of vital biosignals (3–12 lead ECG, SPO2, NIBP, IBP, Temp and still images of the patient. The transmission is performed through GSM mobile telecommunication network, through satellite links (where GSM is not available or through Plain Old Telephony Systems (POTS where available. Using this device a specialist doctor can telematically "move" to the patient's site and instruct unspecialized personnel when handling an emergency or telemonitoring case. Due to the need of storing and archiving of all data interchanged during the telemedicine sessions, we have equipped the consultation site with a multimedia database able to store and manage the data collected by the system. The performance of the system has been technically tested over several telecommunication means; in addition the system has been clinically validated in three

  16. Multi-purpose HealthCare Telemedicine Systems with mobile communication link support.

    Science.gov (United States)

    Kyriacou, E; Pavlopoulos, S; Berler, A; Neophytou, M; Bourka, A; Georgoulas, A; Anagnostaki, A; Karayiannis, D; Schizas, C; Pattichis, C; Andreou, A; Koutsouris, D

    2003-03-24

    The provision of effective emergency telemedicine and home monitoring solutions are the major fields of interest discussed in this study. Ambulances, Rural Health Centers (RHC) or other remote health location such as Ships navigating in wide seas are common examples of possible emergency sites, while critical care telemetry and telemedicine home follow-ups are important issues of telemonitoring. In order to support the above different growing application fields we created a combined real-time and store and forward facility that consists of a base unit and a telemedicine (mobile) unit. This integrated system: can be used when handling emergency cases in ambulances, RHC or ships by using a mobile telemedicine unit at the emergency site and a base unit at the hospital-expert's site, enhances intensive health care provision by giving a mobile base unit to the ICU doctor while the telemedicine unit remains at the ICU patient site and enables home telemonitoring, by installing the telemedicine unit at the patient's home while the base unit remains at the physician's office or hospital. The system allows the transmission of vital biosignals (3-12 lead ECG, SPO2, NIBP, IBP, Temp) and still images of the patient. The transmission is performed through GSM mobile telecommunication network, through satellite links (where GSM is not available) or through Plain Old Telephony Systems (POTS) where available. Using this device a specialist doctor can telematically "move" to the patient's site and instruct unspecialized personnel when handling an emergency or telemonitoring case. Due to the need of storing and archiving of all data interchanged during the telemedicine sessions, we have equipped the consultation site with a multimedia database able to store and manage the data collected by the system. The performance of the system has been technically tested over several telecommunication means; in addition the system has been clinically validated in three different countries using a

  17. Seeing the Unseen: Revealing Mobile Malware Hidden Communications via Energy Consumption and Artificial Intelligence

    OpenAIRE

    Caviglione, Luca; Gaggero, Mauro; Lalande, Jean-François; Mazurczyk, Wojciech; Urbanski, Marcin

    2016-01-01

    International audience; Modern malware uses advanced techniques to hide from static and dynamic analysis tools. To achieve stealthiness when attacking a mobile device, an effective approach is the use of a covert channel built by two colluding applications to locally exchange data. Since this process is tightly coupled with the used hiding method, its detection is a challenging task, also worsened by the very low transmission rates. As a consequence, it is important to investigate how to reve...

  18. Spreading the load: mobile information and communications technologies and their effect on information overload

    Directory of Open Access Journals (Sweden)

    D.K. Allan

    2005-01-01

    Full Text Available Introduction. We report on a small-scale research project which examined the impact of mobile technologies on the users' experience of information overload. The project focused on a group of worker who have had relatively little attention in both the mobile technology and information overload literatures: senior managers. Method. The case study approach was adopted, as complementary to an incremental approach to theory building. An inductive approach is adopted, in which data are collected and the findings are interpreted in the light of previous work. The case site was West Yorkshire Police Force in the UK where BlackBerry handhelds were being used by senior officers. Analysis. A semi-structured interview schedule was developed and applied in face-to-face interviews with the Senior Management Team and their secretaries. All interviews were recorded and the transcripts of the interviews analysed, using qualitative coding. Results. A conceptual model of the interactions and relationships among the key elements that drive and mediate the information flows and information behaviour within a complex organizational environment was developed. Managers' information behaviour and coping strategies were found to have changed since the introduction of mobile devices. Officers are more likely to deal with information received sooner, thereby resulting in less queuing of messages (although filtering strategies still prevail. Approximation (responding in a non-precise way was also found to have increased. In this particular implementation, the mobile technology has not altered the information-pull behaviour of managers. Conclusion. The main finding is that personal information management is now distributed more evenly throughout the day. Thus, the technology has enabled officers to 'spread the load' and, in doing so, has helped to ease some of the pressures created by information overload.

  19. Data communications method for mobile network in fourth generation communications system, involves delivering decoded data to mobile station from relay station, where mobile station receives data from both relay and base stations

    DEFF Research Database (Denmark)

    2008-01-01

    The method involves utilizing a base station (BS) (100) to transmit data to a relay station (RS) (110) and a mobile station (MS) (120), where the data includes two messages. The BS is utilized to transmit the two messages by utilizing a linear combination method, and the data is received in the R...

  20. Evaluating the hydrological consistency of satellite based water cycle components

    KAUST Repository

    Lopez Valencia, Oliver M.

    2016-06-15

    Advances in multi-satellite based observations of the earth system have provided the capacity to retrieve information across a wide-range of land surface hydrological components and provided an opportunity to characterize terrestrial processes from a completely new perspective. Given the spatial advantage that space-based observations offer, several regional-to-global scale products have been developed, offering insights into the multi-scale behaviour and variability of hydrological states and fluxes. However, one of the key challenges in the use of satellite-based products is characterizing the degree to which they provide realistic and representative estimates of the underlying retrieval: that is, how accurate are the hydrological components derived from satellite observations? The challenge is intrinsically linked to issues of scale, since the availability of high-quality in-situ data is limited, and even where it does exist, is generally not commensurate to the resolution of the satellite observation. Basin-scale studies have shown considerable variability in achieving water budget closure with any degree of accuracy using satellite estimates of the water cycle. In order to assess the suitability of this type of approach for evaluating hydrological observations, it makes sense to first test it over environments with restricted hydrological inputs, before applying it to more hydrological complex basins. Here we explore the concept of hydrological consistency, i.e. the physical considerations that the water budget impose on the hydrologic fluxes and states to be temporally and spatially linked, to evaluate the reproduction of a set of large-scale evaporation (E) products by using a combination of satellite rainfall (P) and Gravity Recovery and Climate Experiment (GRACE) observations of storage change, focusing on arid and semi-arid environments, where the hydrological flows can be more realistically described. Our results indicate no persistent hydrological