connectivity—mobile networks and occasionally connected devices

... automatically, but the video may crawl and stutter How you handle that? Connectivity—Mobile Networks and Occasionally Connected Devices If the device supports multiple wireless networks Bluetooth, WiFi, WiMAX, ... Mobile widgets and developments of the browser • Connectivity—mobile networks, occasionally connected devices • Open Handset Alliance and Google's Android system • Resources to keep abreast of the ... timeout to handle small interruptions, but we can't handle total disconnects Or can we? What about the entire buzz around "Occasionally Connected Computing"? Occasionally Connected Computing Occasionally...

Ngày tải lên: 12/08/2014, 21:20

... South America, and now the United States GSM, like IS-54 and IS-136, combines FDMA and TDMA access schemes and uses frequency bands around 900 MHz [7] As shown in Figure 1-6, the first band, dedicated ... we have chosen to deal with W-CDMA and more specifically cdma2000 and UMTS FDD Technologies used in 3G and necessary background material required to understand and, in some instances, develop a ... another 10 MHz band Thus, a total bandwidth of 50 MHz was now available for cellular systems The spectrum allocation is shown in Figure 1-4 The B bands consisting of subbands B and B¿ were provided...

Ngày tải lên: 02/03/2013, 16:58

... South America, and now the United States GSM, like IS-54 and IS-136, combines FDMA and TDMA access schemes and uses frequency bands around 900 MHz [7] As shown in Figure 1-6, the first band, dedicated ... we have chosen to deal with W-CDMA and more specifically cdma2000 and UMTS FDD Technologies used in 3G and necessary background material required to understand and, in some instances, develop a ... another 10 MHz band Thus, a total bandwidth of 50 MHz was now available for cellular systems The spectrum allocation is shown in Figure 1-4 The B bands consisting of subbands B and B¿ were provided...

Ngày tải lên: 23/12/2013, 01:17

... variation in the handoff latency between devices, with a Lucent client and Cisco AP taking an average of 53.3 ms, and a Cisco client and Cisco AP taking 420.8 ms With the same device and AP configuration, ... Balachandran et al [3] Balazinska and Castro [4] Chinchilla et al [5] Henderson et al [9] Hutchins and Zegura [10] Kotz and Essien [13] McNett and Voelker [16] Mishra et al [17] Schwab and Bunt ... in handoff latency, and the higher the latency, the higher the standard deviation Some of the differences in latency between devices could be explained by the different behaviors between devices...

Ngày tải lên: 20/01/2014, 01:21

... Thyaga Nandagopal Communication Protocols and Internetworking Research Bell Laboratories, Lucent Technologies, New Jersey, USA MOBILE, WIRELESS, AND SENSOR NETWORKS MOBILE, WIRELESS, AND SENSOR NETWORKS ... RECENT ADVANCES AND RESEARCH IN SENSOR NETWORKS Detection, Energy, and Robustness in Wireless Sensor Networks 145 Lige Yu and Anthony Ephremides Mobile Target Tracking Using Sensor Networks 173 ... Learning and Prediction 337 Sajal K Das and Diane Cook 14 Enforcing Security in Mobile Networks: Challenges and Solutions 359 Feng Bao, Robert H Deng, Ying Qiu, and Jianying Zhou 15 On-Demand Business:...

Ngày tải lên: 20/01/2014, 01:21

... (MIH) or vertical handover The standard provides information to allow handing over to and from cellular, GSM, GPRS, Wi-Fi, Bluetooth, 802.11 and 802.16 networks through different handover mechanisms ... System) and Radio France in 2000 were deployed All these cellular networks were 1G analog and used frequency bands around 450 and 900 MHz 1.2.4 Second generation (2G) mobile Cellular networks ... broadband Wireless Metropolitan Area Networks It delivers a point to multipoint capability in the 2-11 GHz band The standard is extended to include OFDM and OFDMA 802.16d This is the revision standard...

Ngày tải lên: 16/02/2014, 15:20

... time on our phones and other mobile devices than we now Inevitably, more powerful mobile devices and ubiquitous internet access will become the norm And the context in which those devices are used ... in landscape orientation? No problem: That’s fine and dandy, ... Objective-C, and on Android, in Java In contrast, web applications are interpreted; that is, they have to be read and understood on the fly by the browser’s rendering and JavaScript engines For iOS, Android,...

Ngày tải lên: 17/03/2014, 21:21

... convex sets (POCS) and outer approximation (OA) techniques for use in positioning, and then develop distributed positioning algorithms based on POCS and OA Improvement of coverage and accuracy performance, ... Localization in mobile wireless and sensor networks EURASIP Journal on Wireless Communications and Networking 2011 2011:197 Submit your manuscript to a journal and benefit from: Convenient online ... assistance through the entire editing process, and the Editor-in-Chief of the journal, Prof Luc Vandendorpe, for trusting us with this important assignment and helping us fulfil it successfully Last...

Ngày tải lên: 20/06/2014, 21:20

... Wireless Communications and Networking simulators are used for network planning or for coarse studies to understand the interrelations of new features, for example, heterogeneous networks [12] In this ... U located at the coordinates − u , and C cells c = C All propagation effects (comprising pathloss, → q antenna patterns, and shadowing) between position − and − → cell c are summarized in the ... settings given by the parameters P0c and αc according to [15] We assume that user u is served by cell c = X(u), where X(u) is the connection function, and every user is connected exactly to a single...

Ngày tải lên: 21/06/2014, 11:20

... simulation, protocols, security, and bandwidth management, ad hoc wireless networks, wireless LANs and MANs, wireless fading modeling and measurements, and distributed computing and databases in wireless ... conventional UMTS approach J Al-Saraireh and S Yousef Table 13: Comparing the bandwidth for each activity between database and VLR/MSC Bandwidth between MS and VLR and between databases Current protocol ... Journal on Wireless Communications and Networking Table 6: Bandwidth that is used between entities for current protocol Bandwidth between MS and VLR/MSC (B/S) Bandwidth between databases (B/S)...

Ngày tải lên: 22/06/2014, 22:20

... South America, and now the United States GSM, like IS-54 and IS-136, combines FDMA and TDMA access schemes and uses frequency bands around 900 MHz [7] As shown in Figure 1-6, the first band, dedicated ... we have chosen to deal with W-CDMA and more specifically cdma2000 and UMTS FDD Technologies used in 3G and necessary background material required to understand and, in some instances, develop a ... another 10 MHz band Thus, a total bandwidth of 50 MHz was now available for cellular systems The spectrum allocation is shown in Figure 1-4 The B bands consisting of subbands B and B¿ were provided...

Ngày tải lên: 27/06/2014, 15:20

... xiii Preface xvii Handoff in Wireless Mobile Networks Qing-An Zeng and Dharma P Agrawal 1.1 1.2 1.3 1.4 1.5 1.6 Introduction Types of Handoffs Handoff Initiation Handoff Decision Handoff Schemes ... significant power and bandwidth resources Some wireless networks not have a fixed infrastructure as a backbone Examples are ad hoc networks, sensor networks, and wireless LANs Wireless networks of ... TYPES OF HANDOFFS Handoffs are broadly classified into two categories—hard and soft handoffs Usually, the hard handoff can be further divided into two different types—intra- and intercell handoffs...

Ngày tải lên: 13/08/2014, 12:21

... Assignment scheme and its applications, in Proceedings ICPP Workshop on Wireless Networks and Mobile Computing, Toronto, Canada, August 2000, pp 507–512 Handbook of Wireless Networks and Mobile Computing, ... ᐉ is odd, and at least 2n + 2(n – ␣)/ᐉ when ᐉ is even Let P, n, and ᐉ be as in the statement of the lemma Let u and v be the end nodes of P, and let uЈ and vЈ be the neighbors of u and v, respectively ... is split into two connected nodes, u1 and u2, which are assigned weight ␣ and n – ␣, respectively Similarly, node v is split into the connected nodes v1 and v2, with weight ␣ and n – ␣, respectively...

Ngày tải lên: 13/08/2014, 12:21

... hoc networks Upper and lower bound for deterministic and distributed TSMA-based broadcast can be found in [23, 24] and [25], respectively With mobile ad hoc networks, nodes may be activated and ... facto standard for wireless personal area networks (WPANs), i.e., networks that connect devices placed inside a circle with radius of 10 meters Two main standards exist for wireless local area networks ... technology is suitable for interconnecting portable devices to each other and to broadband core networks such as IP, ATM, and UMTS Infrastructure-based and ad hoc networking configurations are both...

Ngày tải lên: 13/08/2014, 12:21

... all bandwidths and the ensemble size are positive integers R and ␮ are considered as functions R : V ‫2 ۋ‬S and ␮ : S ‫ ގ ۋ‬In the following we usually only specify the parameters G, R, and M and ... El-Rewini and T G Lewis, Distributed and Parallel Computing, Greenwich: Manning, 1998 E D Kaplan, Understanding GPS: Principles and Applications, Boston: Artech House, 1996 E Korach, S Moran, and S ... Nakano and S Olariu, Randomized leader election protocols for ad-hoc networks, Proceedings of Sirocco 7, June 2000, 253–267 242 LEADER ELECTION PROTOCOLS FOR RADIO NETWORKS 16 K Nakano and S...

Ngày tải lên: 13/08/2014, 12:21

... HOC NETWORKS AND THE INTERNET The wide acceptance of Internet standards and technologies was and is one of the key steps for building global computer networks capable of connecting everything and ... access networks can be roughly categorized: random access (e.g., CSMA, CSMA/CD) and demand assignment (e.g., Token Ring) [5] Due to the inherent flexibility of random access systems (e.g., random ... standard operating in the 2.4 GHz Industrial, Scientific, and Medicine (ISM) band aimed at providing a short-range wireless link between laptops, cellular phones, and other devices In this band,...

Ngày tải lên: 13/08/2014, 12:21

... defined as their link bandwidth Taking Figure 17.15(a) as an example, the link bandwidth between B and C is BW(B, C) = {4, 5, 6, 7, 8, 9, 10}, and the link bandwidth between B and A is A B C D code ... http://www.ietf.org/html.charters/manet-charter.html 17 S Murthy and J J Garcia-Luna-Aceves, An efficient routing protocol for wireless networks, ACM Mobile Networks and Application, Oct 183–197, 1996 392 MOBILE AD HOC NETWORKS AND ROUTING PROTOCOLS ... 151–162 20 E Pagani and G P Rossi, Providing reliable and fault tolerant broadcast delivery in mobile adhoc networks, Mobile Networks and Applications, 4, 175–192, 1999 21 V D Park and M S Corson,...

Ngày tải lên: 13/08/2014, 12:21

... where ␣ and ␤ are two parameters set by the user In [6], it is assumed that ␣ = 0.6 and ␤ = 0.5 484 TOPOLOGICAL DESIGN, ROUTING, AND HANDOVER IN SATELLITE NETWORKS 22.4 ROUTING AND HANDOVER ... Sivakumar, and V Bhargavan, Routing in ad hoc networks using a spine, IEEE International Conference on Computers and Communications Networks (ICC’97), 1997 B Das and V Bhargavan, Routing in ad hoc networks ... is empty if and only if D is completely connected, i.e., for every pair of vertices u and v, there are two edges uv and vu ț If D is not completely connected, VЈ forms a dominating and absorbant...

Ngày tải lên: 13/08/2014, 12:21