Download or read book Dynamic Channel Allocation in Satellite and Wireless Networks written by Jun Sun and published by . This book was released on 2007 with total page 165 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this thesis is to understand how to utilize wireless channels in a fair and efficient manner within a multi-users communication environment. We start by exploring the allocation of a single wireless downlink fading channel among competing users. The allocation of a single uplink multiacccess fading channel is studied as well. With multiple parallel fading channels, a MAC protocol based on pricing is proposed to allocate network resource according to users' demand. We also investigate the use of parallel transmissions and redundant packets to reduce the file transmission delay. Specifically, we develop a novel auction-based algorithm to allow users to fairly compete for a downlink wireless fading channel. We first use the second-price auction mechanism whereby user bids for the channel, during each time-slot, based on the fade state of the channel, and the user that makes the highest bid wins use of the channel by paying the second highest bid. Under the assumption that each user has a limited budget for bidding, we show the existence of a Nash equilibrium strategy. And the Nash equilibrium leads to a unique allocation for certain channel state distribution. We also show that the Nash equilibrium strategy leads to an allocation that is pareto optimal. We also investigate the use of another auction mechanism, the all-pay auction, in allocating a single downlink channel. A unique Nash equilibrium is shown to exist. We also show that the Nash equilibrium strategy achieves a throughput allocation for each user that is proportional to the user's budget For the uplink of a wireless channel, we present a game-theoretical model of a wireless communication system with multiple competing users sharing a multiaccess fading channel. With a specified capture rule and a limited amount of energy available, a user opportunistically adjusts its transmission power based on its own channel state to maximize the user's own individual throughput. We derive an explicit form of the Nash equilibrium power allocation strategy. Furthermore, as the number of users in the system increases, the total system throughput obtained by using a Nash equilibrium strategy approaches the maximum attainable throughput. In a communication scenario where multiple users sharing a set of multiple parallel channels to communicate with multiple satellites, we propose a novel MAC protocol based on pricing that allocates network resources efficiently according to users' demand. We first characterize the Pareto efficient throughput region (i.e., the achievable throughput region). The equilibrium price, where satellite achieve its objective and users maximize their payoffs, is shown to exist and is unique. The resulting throughput at the equilibrium is shown to be Pareto efficient. Finally, we explore how a user can best utilize the available parallel channels to reduce the delay in sending a file to the base-station or satellite. We study the reduction of the file delay by adding redundant packets (i.e., coding). Our objective here is to characterize the delay and coding tradeoff in a single flow case. We also want to address the question whether coding will help to reduce delay if every user in the system decides to add redundancy for its file transmission.

Download or read book Connections Management Strategies in Satellite Cellular Networks written by Malek Benslama and published by John Wiley & Sons. This book was released on 2015-02-16 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a novel method based on advantages of mobility model of Low Earth Orbit Mobile Satellite System LEO MSS which allows the evaluation of instant of subsequent handover of a MS even if its location is unknown. This method is then utilized to propose two prioritized handover schemes, Pseudo Last Useful Instant PLUI strategy and Dynamic Channel Reservation DCR-like scheme based respectively on LUI and DCR schemes, previously proposed in literature. The authors also approach a different aspect of handover problem: calls with short durations dropped due to a handover failure. We propose a decision system based on fuzzy logic Rescuing System that allows the rescue of calls with short durations facing a premature at the expense of those lasting for long durations.

Download or read book Performance Analysis of a Dynamic Channel Allocation Technique for Terrestrial and Satellite Mobile Cellular Networks written by Enrico Del Re and published by . This book was released on 1993 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dynamic Power Allocation and Routing for Satellite and Wireless Networks with Time Varying Channels written by Michael James Neely and published by . This book was released on 2003 with total page 295 pages. Available in PDF, EPUB and Kindle. Book excerpt: (Cont.) Ad-hoc wireless networks are given special attention in Chapter 6. A simple cell- partitioned model for a mobile ad-hoc network with N users is constructed, and exact expressions for capacity and delay are derived. End-to-end delay is shown to be O(N), and hence grows large as the size of the network is increased. To reduce delay, a transmission protocol which sends redundant packet information over multiple paths is developed and shown to provide O(vN) delay at the cost of reducing throughput. A fundamental rate- delay tradeoff curve is established, and the given protocols for achieving O(N) and O(vN) delay are shown to operate on distinct boundary points of this curve. In Chapters 4 and 5 we consider optimal control for a general time-varying network. A cross-layer strategy is developed that stabilizes the network whenever possible, and makes fair decisions about which data to serve when inputs exceed capacity. The strategy is decoupled into separate algorithms for dynamic flow control, power allocation, and routing, and allows for each user to make greedy decisions independent of the actions of others. The combined strategy is shown to yield data rates that are arbitrarily close to the optimally fair operating point that is achieved when all network controllers are coordinated and have perfect knowledge of future events. The cost of approaching this fair operating point is an end-to-end delay increase for data that is served by the network.

Download or read book Channel Allocation in Wireless Networks written by Clive William Reeves Cooper and published by . This book was released on 2004 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Comprehensive Review of Methods for the Channel Allocation Problem written by Cheeneebash, Jayrani and published by African Minds. This book was released on 2014-12-01 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study of the channel allocation problem has received much attention during the last decade. Several techniques such as genetic algorithm, artificial neural network, simulated annealing, tabu search and others have been used. This book is devoted to compiling all the techniques that have been used to solve the channel allocation problem. Each of the methods is described fully in a manner that explains the essential parts of how the techniques are formulated and applied in solving the problem. This textbook will be helpful to students studying communications or researchers as it compiles all the techniques used since this problem was first solved.

Download or read book Connections Management Strategies in Satellite Cellular Networks written by Malek Benslama and published by John Wiley & Sons. This book was released on 2015-02-02 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a novel method based on advantages of mobility model of Low Earth Orbit Mobile Satellite System LEO MSS which allows the evaluation of instant of subsequent handover of a MS even if its location is unknown. This method is then utilized to propose two prioritized handover schemes, Pseudo Last Useful Instant PLUI strategy and Dynamic Channel Reservation DCR-like scheme based respectively on LUI and DCR schemes, previously proposed in literature. The authors also approach a different aspect of handover problem: calls with short durations dropped due to a handover failure. We propose a decision system based on fuzzy logic Rescuing System that allows the rescue of calls with short durations facing a premature at the expense of those lasting for long durations.

Download or read book Algorithms for Dynamic Channel Assignment written by Robert T. Harrild and published by . This book was released on 1986 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Handbook of Algorithms for Wireless Networking and Mobile Computing written by Azzedine Boukerche and published by CRC Press. This book was released on 2005-11-28 with total page 1042 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Handbook of Algorithms for Wireless Networking and Mobile Computing focuses on several aspects of mobile computing, particularly algorithmic methods and distributed computing with mobile communications capability. It provides the topics that are crucial for building the foundation for the design and construction of future generations of mobile and wireless networks, including cellular, wireless ad hoc, sensor, and ubiquitous networks. Following an analysis of fundamental algorithms and protocols, the book offers a basic overview of wireless technologies and networks. Other topics include issues related to mobility, aspects of QoS provisioning in wireless networks, future applications, and much more.

Download or read book Dynamic Channel Allocation written by Andrew D. Kaminsky and published by . This book was released on 2003-09-01 with total page 211 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dynamic Channel Allocation (DCA) offers the possibility of capturing unused channel capacity by allocating unused resources between competing network nodes. This can reduce or possibly eliminate channels sitting idle while information awaits transmission. This holds potential for increasing throughput on bandwidth constrained networks. This thesis begins by examining channel allocation techniques currently used. Following this, a solution is proposed that utilizes two types of algorithms to dynamically allocate channels from which a computer simulation is devised. Upon gathering the results, an analysis is conducted and suggestions are given for future work in channel allocation. Chapter II discusses and compares fixed channel allocation with dynamic channel allocation. In addition, some of the algorithms used to achieve channel allocation are explored. This chapter also looks at techniques used, such as inverse multiplexing, time division multiplexed on demand, hybrid channel allocation in wireless networks, and Beowulf Ethernet channel bonding. The background information presented in this chapter gives an indication that channel allocation is still being examined and several implementations are proposed. Chapter III proposes a solution with two scheduling algorithms. One algorithm is a First Come First Serve, which gives all free dynamic channels to the first requesting fixed channel. The other algorithm is a Fair Distribution, which gives a portion of the free dynamic channels to the requesting fixed channels. A computer program is devised that simulates these algorithms, and the methods used in the program classes are described in this chapter. (27 tables, 19 figures, 38 refs.)

Download or read book Inter satellite Link Channel Management for Mobile Satellite Systems written by Angeline Anthony Dass and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Low Earth Orbit (LEO) satellite constellations are foreseen as appropriate alternatives to the geostationary satellite systems for providing global personal communications services (PCS). Compared to geostationary satellites, these constellations offer a significantly smaller round trip delay between earth and space segments. Furthermore, the use of inter-satellite links (ISLs) has been identified as a means to provide global connectivity in space, thereby enhancing system autonomy and flexibility, and has been retained in the design of systems like Teledesic and SkyBridge. From a network point of view, a major benefit of a ISL subnetwork in space lies in the possibility to transport long distance traffic over reliable and high capacity connections, thus forming a good base for ATM (asynchronous transfer mode) operation. With the development of the third generation (3G) and fourth generation (4G) wireless networks, A TM is regarded as one of the potential promising candidates for providing QoS guaranteed broadband telecommunication services. It is possible to integrate the mobile satellite and A TM by applying the inter/intra satellite links (ISLs) as the physical layer of W A TM and considering a connection between two satellites as a virtual path connection (VPC) in ATM. A handoff event will cause re-allocation on the affected ISL channel resources. As the increasing of the arrival rate of handoff calls, channel management becomes a very important issue in providing QoS. Methods to keep the frequency of handoff as low as possible, and how to alleviate the side-effects of handoff events on the whole network are very important in providing QoS promised service. A good routing scheme is always highly related to the happening of handoff events. In order to best utilize the network resource and provide better network QoS, a dynamic channel allocation scheme (DCAS) is considered, giving higher priority to handoff calls compared to new calls and real time traffic over non real time traffic. The higher priority traffic will have a larger probability to access a channel, while the lower priority traffic will have a.~smalier probability to obtain a channel. In this way, we give highest priority to the real time handoff calls, followed by the non real time handoff calls, then the real time new calls and lastly the non real time new calls. The channel access probability also depends on the mobility of call (handover call arrival rate over the new call arrival rate) and the channel resources. A suitable routing method was used based on the Modified Dijkstra Shortest Path algorithm. For an efficient channel management scheme, the dynamic channel allocation and shortest path routing methods are combined. The new channel management scheme allows the higher priority call to obtain a larger call acceptance probability and utilize the shortest path, while the lower priority call will have a smaller call acceptance probability and utilize the longer routes. The network performance is measured from its end-to-end delay, new call blocking probability, and handoff call blocking probability. The new channel management scheme improves the utilization of the network resources by reducing the handover call blocking probability while guaranteeing a certain quality of service for the new call blocking probability.

Download or read book Fundamentals of Resource Allocation in Wireless Networks written by Slawomir Stanczak and published by Springer Science & Business Media. This book was released on 2009-06-29 with total page 445 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this book is to provide tools for a better understanding of the fundamental tradeo?s and interdependencies in wireless networks, with the goal of designing resource allocation strategies that exploit these int- dependencies to achieve signi?cant performance gains. Two facts prompted us to write it: First, future wireless applications will require a fundamental understanding of the design principles and control mechanisms in wireless networks. Second, the complexity of the network problems simply precludes the use of engineering common sense alone to identify good solutions, and so mathematics becomes the key avenue to cope with central technical problems in the design of wireless networks. In this book, two ?elds of mathematics play a central role: Perron-Frobenius theory for non-negative matrices and optimization theory. This book is a revised and expanded version of the research monograph “Resource Allocation in Wireless Networks” that was published as Lecture Notes in Computer Sciences (LNCS 4000) in 2006. Although the general structure has remained unchanged to a large extent, the book contains - merous additional results and more detailed discussion. For instance, there is a more extensive treatment of general nonnegative matrices and interf- ence functions that are described by an axiomatic model. Additional material on max-min fairness, proportional fairness, utility-based power control with QoS (quality of service) support and stochastic power control has been added.

Download or read book Modeling and Simulation Environment for Satellite and Terrestrial Communications Networks written by A. Nejat Ince and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modeling and Simulation Environment for Satellite and Terrestrial Communications Networks: Proceedings of the European COST Telecommunications Symposium will be of interest to network designers, developers, and operators. This book is a collection of papers given at the European Cost Telecommunications Symposium. The Symposium was broken down into four sessions: Modelling and Simulation. Teletraffic Modelling. Communications Networks Simulation. Problems in Simulation. Each session addressed a wide spectrum of subjects. The symposium covered nearly all of the important aspects of simulation modeling and tools for the design and performance evaluation of communication techniques and systems. Emerging techniques were emphasized. Modeling and Simulation Environment for Satellite and Terrestrial Communications Networks: Proceedings of the European COST Telecommunications Symposium is a useful reference work for practicing engineers and academic researchers.

Download or read book Dynamic Channel Allocation for Medium Access Control in Spread spectrum Ad hoc Networks written by Amit Pramod Butala and published by . This book was released on 2001 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Mobile Satellite Communication Networks written by Ray E. Sheriff and published by John Wiley & Sons. This book was released on 2003-05-09 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mobile satellite services are set to change with the imminent launch of satellite personal communication services (S-PCS), through the use of non-geostationary satellites. This new generation of satellites will be placed in low earth orbit or medium earth orbit, hence, introducing new satellite design concepts. One of the first texts to cover this rapidly evolving field, this text provides the reader with an overview of mobile satellite systems, from their initial introduction (Inmarsat), current satellite-PCS (referring to such systems as Globalstar), through to Satellite-UMTS and an understanding of the following: * The design concepts associated with non-geostationary satellite systems (constellation, link budgets, Doppler) * The concepts of UMTS (network architecture, aims, in the context of IMT-2000) and the role foreseen for the satellite component (complementary to terrestrial network, network extension, global availability) * Inter-working between satellite and terrestrial networks (network architecture, ATM Adaptation Layer) * Radio interface technologies (WB-CDMA, TDMA, transmission environment) * Regulatory issues * Future services and applications * Potential satellite markets (prediction techniques, effect of tariffing policies on potential market) With leading edge information, this valuable resource will be indispensable to researchers, engineers, operators and market evaluators in satellite service industries and research institutions, as well as postgraduates and research students in the field.

Download or read book Satellite Personal Communications for Future generation Systems written by Enrico Del Re and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 209 pages. Available in PDF, EPUB and Kindle. Book excerpt: Consisting of selected technical contributions to the European Project COST252, this volume provides many innovative results which can be the basis for new global telecommunications systems providing multimedia services at high rates. It also presents new perspectives on communications problems in various areas.

Download or read book Advanced Wireless Networks written by Savo Glisic and published by John Wiley & Sons. This book was released on 2009-04-27 with total page 892 pages. Available in PDF, EPUB and Kindle. Book excerpt: With 40% new material the new edition of Advanced Wireless Networks provides a comprehensive representation of the key issues in 4G wireless networks. Focussing on cognitive, cooperative and opportunistic paradigms to provide further increase in network efficiency, the book explores and addresses issues in wireless internet, mobile cellular and WLAN, as well as sensor, ad hoc, bio-inspired, active and cognitive networks. It examines the problem of cross-layer optimisation and network information theory as well as adaptability and reconfigurability in wireless networks. This book is an integral description of future wireless networks and the interconnection between their elements. The information is presented in a logical order within each chapter making it ideal for all levels of reader including researchers involved in modelling and analysis of future networks as well as engineers working in the area. Each chapter starts with introductory material and gradually includes more sophisticated models and mathematical tools concluding with a comprehensive list of references. Fully updated throughout with five new chapters on Opportunistic Communications; Relaying and Mesh Networks; Topology Control; Network Optimization; and Cognitive Radio Resource Management Unifies the latest research on cognitive, cooperative and opportunistic paradigms in wireless communications Provides efficient analytical tools for network analysis Discusses security issues, an essential element of working with wireless networks Supports advanced university and training courses in the field Companion website containing extra appendix on Queuing theory