Download or read book Towards Efficient and Fair Resources Management in Wireless Mesh Networks written by Ali El Masri and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main purpose of Wireless Mesh Networks (WMNs) is to provide a communication backbone for a high number of end-users, thus WMNs have to support heavy traffic load. In this thesis, we intend to maximize utilization and achieve fair allocation of the bandwidth resources in WMNs. We consider two WMN environments: WMN using the IEEE 802.11 MAC standard, which is characterized by its cheap devices and widespread deployment, and WMN using directional antennas, which are emerged as an attractive technology to enhance the spatial reusability in wireless networks. For WMM based on IEEE 802.11, we design NICC, a congestion control scheme that recognizes congestion as neighborhood-related problem, and not a link-based one. Indeed, complex interference among neighboring nodes is the main starvation cause in WMNs. Therefore, NICC handles congestion using mutual cooperation within a wireless neighborhood. NICC makes use of some underexploited fields in the IEEE 802.11frame header in order to provide an implicit multi-bit congestion feedback, and thus ensure accurate rate control without generating overhead, making efficient use of bandwidth. For WMN with directional antennas, we design FreeDMAC, a TDMA-based MAC scheme with contention-free scheduling. FreeDMAC guarantees that each node is aware of all ongoing transmissions in its neighborhood, and thus avoids directional-related problems such as deafness, making efficient use of bandwidth. Moreover, FreeDMAC presents a link-slot assignment that provides two levels of fairness: Per-link and per-flow fairness.

Download or read book Fair and Efficient Resource Management in Multi hop Wireless Mesh Networks written by Duc Binh Ngo and published by . This book was released on 2008 with total page 199 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Radio Resource Management for Wireless Mesh Networks Supporting Heterogeneous Traffic written by Ho Ting Cheng and published by . This book was released on 2009 with total page 245 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wireless mesh networking has emerged as a promising technology for future broadband wireless access, providing a viable and economical solution for both peer-to-peer applications and Internet access. The success of wireless mesh networks (WMNs) is highly contingent on effective radio resource management. In conventional wireless networks, system throughput is usually a common performance metric. However, next-generation broadband wireless access networks including WMNs are anticipated to support multimedia traffic (e.g., voice, video, and data traffic). With heterogeneous traffic, quality-of-service (QoS) provisioning and fairness support are also imperative. Recently, wireless mesh networking for suburban/rural residential areas has been attracting a plethora of attentions from industry and academia. With austere suburban and rural networking environments, multi-hop communications with decentralized resource allocation are preferred. In WMNs without powerful centralized control, simple yet effective resource allocation approaches are desired for the sake of system performance melioration. In this dissertation, we conduct a comprehensive research study on the topic of radio resource management for WMNs supporting multimedia traffic. In specific, this dissertation is intended to shed light on how to effectively and efficiently manage a WMN for suburban/rural residential areas, provide users with high-speed wireless access, support the QoS of multimedia applications, and improve spectrum utilization by means of novel radio resource allocation. As such, five important resource allocation problems for WMNs are addressed, and our research accomplishments are briefly outlined as follows: Firstly, we propose a novel node clustering algorithm with effective subcarrier allocation for WMNs. The proposed node clustering algorithm is QoS-aware, and the subcarrier allocation is optimality-driven and can be performed in a decentralized manner. Simulation results show that, compared to a conventional conflict-graph approach, our proposed approach effectively fosters frequency reuse, thereby improving system performance; Secondly, we propose three approaches for joint power-frequency-time resource allocation. Simulation results show that all of the proposed approaches are effective in provisioning packet-level QoS over their conventional resource allocation counterparts. Our proposed approaches are of low complexity, leading to preferred candidates for practical implementation; Thirdly, to further enhance system performance, we propose two low-complexity node cooperative resource allocation approaches for WMNs with partner selection/allocation. Simulation results show that, with beneficial node cooperation, both proposed approaches are promising in supporting QoS and elevating system throughput over their non-cooperative counterparts; Fourthly, to further utilize the temporarily available radio spectrum, we propose a simple channel sensing order for unlicensed secondary users. By sensing the channels according to the descending order of their achievable rates, we prove that a secondary user should stop at the first sensed free channel for the sake of optimality; and Lastly, we derive a unified optimization framework to effectively attain different degrees of performance tradeoff between throughput and fairness with QoS support. By introducing a bargaining floor, the optimal tradeoff curve between system throughput and fairness can be obtained by solving the proposed optimization problem iteratively.

Download or read book Resource Management for Heterogeneous Wireless Networks written by Amila Tharaperiya Gamage and published by Springer. This book was released on 2017-08-18 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides an in-depth discussion on how to efficiently manage resources of heterogeneous wireless networks and how to design resource allocation algorithms to suit real world conditions. Efficiently managing resources of the networks is more crucial now, than ever before, to meet users’ rapidly increasing demand for higher data rates, better quality-of-service (QoS) and seamless coverage. Some of the techniques that can be incorporated within heterogeneous wireless networks to achieve this objective are interworking of the networks, user multi-homing and device-to-device (D2D) communication. Designing resource allocation algorithms to suit real world conditions is also important, as the algorithms should be deployable and perform well in real networks. For example, two of the conditions considered in this book are resource allocation intervals of different networks are different and small cell base stations have limited computational capacity. To address the first condition, resource allocation algorithms for interworking systems are designed to allocate resources of different networks at different time-scales. To address the second condition, resource allocation algorithms are designed to be able to run at cloud computing servers. More of such conditions, algorithms designed to suit these conditions, modeling techniques for various networks and performance analysis of the algorithms are discussed in the book. This book concludes with a discussion on the future research directions on the related fields of study. Advanced-level students focused on communication and networking will use this book as a study guide. Researchers and experts in the fields of networking, converged networks, small-cell networks, resource management, and interference management, as well as consultants working in network planning and optimization and managers, executives and network architects working in the networking industry will also find this book useful as a reference.

Download or read book Sustainable Wireless Networks written by Zhongming Zheng and published by Springer Science & Business Media. This book was released on 2013-10-07 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: This brief focuses on network planning and resource allocation by jointly considering cost and energy sustainability in wireless networks with sustainable energy. The characteristics of green energy and investigating existing energy-efficient green approaches for wireless networks with sustainable energy is covered in the first part of this brief. The book then addresses the random availability and capacity of the energy supply. The authors explore how to maximize the energy sustainability of the network and minimize the failure probability that the mesh access points (APs) could deplete their energy and put the network out of service due to the unreliable energy supply. This brief also studies network resource management issues in green wireless networks to minimize cost. It jointly considers the relay node (RN) placement and sub-carrier allocation (RNP-SA) issues in wireless networks with sustainable energy, and then formulates the problem into a mixed integer non-linear programming problem. Concise and informative, this brief is a useful resource for professionals or researchers studying wireless networks, communication networks, and energy efficiency. Advanced-level students interested in energy technology or communications engineering will also find the material valuable.

Download or read book Distributed Resource Management for Wireless Mesh Networks written by Xiaobo Yu and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Wireless mesh networking is expected to play an important role in the future Inter- net. It can facilitate network coverage at less expense, making it a fitting candidate for multi-hop communications in distributed wireless environments. However, Wireless Mesh Networks (WMNs) still suffer from many problems such as channel contention, interference low efficiency of bandwidth utilization, etc. Therefore, guaranteeing Quality of Service (QoS) for multimedia applications while ensuring high bandwidth efficiency is a challenging task in WMNs. In this context, this thesis aims at solving these problems from a resource management at Medium Access Control (MAC) layer point of view. The thesis first surveys the existing protocol designs for Resource Reservation (RR) in IEEE 802.11-based wireless networks. It advises the necessity of MAC layer protocol design for guaranteeing the QoS for Real-Time Sessions (RTSNs) while optimizing bandwidth efficiency. Following the outcomes of the investigation, the thesis proposes an analytical framework to evaluate the guaranteed QoS performance of distributed hybrid MAC RR schemes in distributed single-hop wireless networks. After that, the thesis devises a comprehensive hybrid MAC RR scheme that consists of a distributed hybrid MAC scheduling mechanism and a distributed Admission Control (AC) algorithm. The hybrid MAC scheduling mechanism can provide contention-free channel access for RTSNs and reserve dedicated and periodic resources for them to ensure their QoS guaranteeing. In addition, the mechanism can implement concurrent transmission in the Contention-Free Period (CFP) in order to enhance the bandwidth usage for the reserved resources. The distributed Admission Control Algorithm (ACA), on the other harid, can cooperate with the distributed hybrid MAC scheduling mechanism in order to make optimized RR for RTSNs with specific QoS requirements. Furthermore, the proposed distributed ACA can help MAC scheduler to implement resource sharing. It can permit several RTSNs to share an identical Transmission Opportunity (TXOP) in the CFP provided that each of the resource sharer can obtain guaranteed QoS. This can directly improve the efficiency of bandwidth utilization.

Download or read book Guide to Wireless Sensor Networks written by Sudip Misra and published by Springer Science & Business Media. This book was released on 2009-05-29 with total page 725 pages. Available in PDF, EPUB and Kindle. Book excerpt: Overview and Goals Wireless communication technologies are undergoing rapid advancements. The last few years have experienced a steep growth in research in the area of wireless sensor networks (WSNs). In WSNs, communication takes place with the help of spatially distributedautonomoussensornodesequippedtosensespeci?cinformation. WSNs, especially the ones that have gained much popularity in the recent years, are, ty- cally, ad hoc in nature and they inherit many characteristics/features of wireless ad hoc networks such as the ability for infrastructure-less setup, minimal or no reliance on network planning, and the ability of the nodes to self-organize and self-con?gure without the involvement of a centralized network manager, router, access point, or a switch. These features help to set up WSNs fast in situations where there is no existing network setup or in times when setting up a ?xed infrastructure network is considered infeasible, for example, in times of emergency or during relief - erations. WSNs ?nd a variety of applications in both the military and the civilian population worldwide such as in cases of enemy intrusion in the battle?eld, object tracking, habitat monitoring, patient monitoring, ?re detection, and so on. Even though sensor networks have emerged to be attractive and they hold great promises for our future, there are several challenges that need to be addressed. Some of the well-known challenges are attributed to issues relating to coverage and deployment, scalability, quality-of-service, size, computational power, energy ef?ciency, and security.

Download or read book Wireless Device to Device Communications and Networks written by Lingyang Song and published by Cambridge University Press. This book was released on 2015-03-12 with total page 437 pages. Available in PDF, EPUB and Kindle. Book excerpt: Enables engineers and researchers to understand the fundamentals and applications of device-to-device communications and its optimization in wireless networking.

Download or read book A Solution to Optimal and Fair Rate Adaptation in Wireless Mesh Networks written by Pieter Albertus Jansen Van Vuuren and published by . This book was released on 2013 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Optimal Resource Management in Wireless Access Networks written by and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents several simple, robust, and optimal resource management schemes for multihop wireless access networks with the main focus on multi-channel wireless mesh networks (MC WMNs). In this regard, various resource management optimization problems are formulated arid efficient algorithms are proposed to solve each problem. First, we consider the channel as signment problem in MC-WMNs and formulate different resource management problems within the general framework of network utility maximization (NUM). Unlike most of the previously proposed channel assignment schemes, our algorithms can not only assign the orthogonal (i.e., non-overlapped) channels, but also partially overlapped channels. This better utilizes the avail able frequency spectrum as a critical resource in MC-WMNs. Second, we propose two distributed random medium access control (MAC) algorithms to solve a non-convex NUM problem at the MAC layer. The first algorithm is fast, optimal, and robust to message loss and delay. It also only requires a limited message passing among the wireless nodes. Using distributed learning techniques, we then propose another NUM-based MAC algorithm which achieves the optimal performance without frequent message exchange. Third, based on our results on random MAC, we develop a distributed multi-interface multi-channel random access algorithm to solve the NUM problem in MC-WMNs. Different from most of the previous channel assignment schemes in the literature, where channel assignment is intuitively modeled in the form of combinatorial and discrete optimization problems, our scheme is based on formulating a novel continuous optimization model. This makes the analysis and implementation significantly easier. Finally, we consider the problem of pricing and monetary exchange in multi-hop wireless access networks, where each intermediate node receives a payment to compensate for its offered packet forwarding service. In this regard, we propose a market-based wireless ac.

Download or read book Managing Wireless Mesh Networks written by Dhruv Gupta and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Network Management can be defined as the deployment, integration, and coordination of hardware, software, and human elements to monitor, analyze, evaluate, and control network resources, in order to meet the operational performance and Quality of Service requirements in a network. It includes the ability to monitor and gather data from various distributed network entities, and utilize this information for the purpose of maintaining network performance. It includes performance management, fault management, and network configuration and accounting. Wireless Mesh Networks (WMNs) are multi-hop wireless networks that have become increasingly prevalent over the last few years. They are being applied to an increasing number of applications ranging from municipal and enterprise networks to wildlife monitoring. However, apart from the usual intricacies involved in a wireless network, WMNs involve data transfer over multiple wireless hops, which adds to the complexity of maintaining network performance. The increasing popularity of WMNs calls for new and effective management schemes to be in place. We focus on three core areas within network management. We first investigate the aspect of efficient monitoring in WMNs. This study is a crucial first step in our research, as it enables us to identify the impact of monitoring overheads on data traffic. The second aspect we study is that of resource control. Based on the inferences from our previous study, we implement passive monitoring modules in order to measure various network parameters. We implement an admission control scheme, based on end-to-end delay, which helps us in regulating the amount of traffic in the network. We also implement an association control scheme that utilizes available bandwidth as the design metric and enables end users to make intelligent access point selection decision. We demonstrate the advantages of these approaches in terms of achieving better network performance, and enabling effective resource control. Lastly, we consider the problem of fault diagnosis in wireless networks. We design and implement a novel framework wherein unique signatures are maintained for different network faults. These signatures help us identify the occurrence of a particular fault in the network, and also enable us to distinguish them from legitimate network events.

Download or read book Resource Management Techniques for High Performance Ultra Widebrand Wireless Networks written by Yang Liu and published by Open Dissertation Press. This book was released on 2017-01-27 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Resource Management Techniques for High Performance Ultra Widebrand Wireless Networks" by Yang, Liu, 劉揚, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled "Resource Management Techniques for High Performance Ultra Wideband Wireless Networks" Submitted by LIU, Yang for the degree of Doctor of Philosophy at the University of Hong Kong in August 2006 Ultra wideband (UWB) short-range wireless communication systems are now widely envisioned as the key enabling technologies for high performance (i.e., high data rate and scalable) mobile computing applications such as real-time wireless video streaming, multiplayer wireless gaming, etc. However, many important resource management issues remain to be tackled before a UWB based wireless network can fully deliver its potential. Indeed, researchers have found that the applicability of existing resource management techniques designed for narrowband wireless systems or cellular networks for a UWB based environment is largely unknown. Specifically, a typical UWB physical layer design exhibits unique properties that do not exist in traditional wireless communication systems. As such, it becomes a new challenging problem to study the interplay of the UWB physical layer with the medium access control (MAC) layer in supporting quality-or-service (QoS) guaranteed applications. In this thesis, we have tackled five different resource management problems in UWB based networks. First, we observe that to provide adequate application layer QoS support, we must enhance the performance of the TCP layer so that it can fully exploit the high data rate provided by the underlying UWB based network. We propose a cross layer rate and power allocation algorithm based on the multilayer mode for a relatively small scale UWB mesh network. Second, in high density infrastructure networks, the fairness issue needs to be adequately addressed. Accordingly, we propose two new approaches in which the power level threshold used for handling the fairness parameter is dynamically adjusted for different traffic models. Third, we move on to consider ad hoc UWB based wireless networks. In such an environment, jointly optimizing the power level and data rate for each user becomes a difficult problem. We propose a practical optimization algorithm based on judicious power control for real-time applications and opportunistic scheduling for non-real-time applications in a small scale ad hoc network. In both scenarios, user specified QoS is guaranteed. Fourth, we consider the bandwidth scheduling problem in a UWB based hierarchical enterprise-scale ad hoc network. Based on mathematical analysis and computer simulations, it is demonstrated that our proposed scheduling scheme exhibits close-to-optimal performance governed by the proportional fairness (PF) constraint. Moreover, a novel self-organized clustering method is designed to improve system throughput while meeting the PF constraint. Finally, based on our practical clustering method with clusters connectivity guarantees, we propose an overlay network design for UWB enterprise-scale ad hoc networks. Results from an extensive simulation study indicate that our proposed techniques in all five problems are effective and outperform various existing approaches. (455 words) DOI: 10.5353/th_b3783410 Subjects: Ultra-wideband devices Broadband communication systems Wireless communication systems Scheduling Algorithms

Download or read book Resource Allocation and Management in Wireless Mesh Networks written by Liqiang Zhang and published by . This book was released on 2009 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Resource Management in Dense Wireless Networks written by Seyed Hamed Mosavat-Jahromi and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Recently, the wide range of communication applications has greatly increased the number of connected devices, and this trend continues by emerging new technologies such as Internet-of-Things (IoT) and vehicular ad hoc networks (VANETs). The increase in the number of devices may sooner or later cause wireless spectrum shortage. Furthermore, with the limited wireless spectrum, transmission efficiency degrades when the network faces a super-dense situation. In IEEE 802.11ah-based networks whose channel access protocol is basically a contention-based one, the protocol loses its efficiency when the total number of contending users grows. VANETs suffer from the same problem, where broadcasting and receiving safety messages, i.e., beacons, are critical. An inefficient medium access control (MAC) can negatively impact the network's reliability. Effective resource management solutions are needed to improve the network's reliability and scalability considering the features of different types of networks. In this work, we address the resource management problem in dense wireless networks in vehicle-to-everything (V2X) systems and IoT networks. For IoT networks, e.g., sensor networks, in which the network topology is quite stable, the grouping technique is exploited to make the stations (STAs) compete in a group to mitigate the contention and improve the channel access quality. While, in VANETs, devices are mobile and the network topology changes over time. In VANETs, beacons should be broadcast periodically by each vehicle reliably to improve road safety. Therefore, how to share the wireless resources to ensure reliability and scalability for these dense static and mobile wireless networks is still a difficult and open problem. In static IoT networks, we apply the Max-Min fairness criterion to the STAs' throughput to group the STAs to ensure network performance and fairness. Formulation of the problem results in a non-convex integer programming optimization problem which avoids hidden terminals opportunistically. As solving the optimization problem has a high time complexity, the Ant Colony Optimization (ACO) method is applied to the problem to find the sub-optimal solution. To support reliable and efficient broadcasting in VANET, wireless resources are divided into basic resource units in the time and frequency domains, and a distributed and adaptive reservation-based MAC protocol (DARP) is proposed. For decentralized control in VANETs, each vehicle's channel access is coordinated with its neighbors to solve the hidden terminal problem. To ensure the reliability of beacon broadcasting, different kinds of preambles are applied in DARP to support distributed reservation, detect beacon collisions, and resolve the collisions. Once a vehicle reserves a resource unit successfully, it will not release it until a collision occurs due to topology change. Protocol parameters, including transmission power and time slots duration, can be adjusted to reduce collision probability and enhance reliability and scalability. Simulation of urban mobility (SUMO) is used to generated two different city traces to assess the DARP's performance. Then, a distributed network coding-based MAC protocol (NC-MAC) is proposed to support reliable single-hop vehicle-to-vehicle (V2V) beacon broadcasting. We combine the preamble-based feedback mechanism, retransmissions, and network coding together to enhance broadcasting reliability. We deploy the preamble mechanism to facilitate the negative acknowledgment (NACK) and retransmission request procedures. Moreover, linear combinations of missed beacons are generated according to the network coding (NC) principles. We also use SUMO to evaluate the NC-MAC's performance in highway and urban scenarios. Group-casting and applying multi-hop communication can ensure reliability in V2X systems. As an extension of the proposed NC-MAC, a distributed grouping and network coding-assisted MAC protocol (GNC-MAC) is proposed to support reliable group-casting and multi-hop communication, which can address blockchain protocols' requirements. We propose a new grouping protocol by combining preamble-based feedback mechanism, multi-hop communication, and network coding to improve group-casting reliability. The preamble mechanism is responsible for reporting a NACK and requesting retransmission due to beacon missing. The missed beacons are combined according to the NC principles and sent on a resource block.

Download or read book Wireless Sensor Networks and Energy Efficiency Protocols Routing and Management written by Zaman, Noor and published by IGI Global. This book was released on 2012-01-31 with total page 656 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This book focuses on wireless sensor networks and their operation, covering topics including routing, energy efficiency and management"--

Download or read book Wireless Mesh Networks written by Mutamed Khatib and published by . This book was released on 2020-05-13 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Handbook of the Shapley Value written by Encarnación Algaba and published by CRC Press. This book was released on 2019-12-06 with total page 607 pages. Available in PDF, EPUB and Kindle. Book excerpt: Handbook of the Shapley Value contains 24 chapters and a foreword written by Alvin E. Roth, who was awarded the Nobel Memorial Prize in Economic Sciences jointly with Lloyd Shapley in 2012. The purpose of the book is to highlight a range of relevant insights into the Shapley value. Every chapter has been written to honor Lloyd Shapley, who introduced this fascinating value in 1953. The first chapter, by William Thomson, places the Shapley value in the broader context of the theory of cooperative games, and briefly introduces each of the individual contributions to the volume. This is followed by a further contribution from the editors of the volume, which serves to introduce the more significant features of the Shapley value. The rest of the chapters in the book deal with different theoretical or applied aspects inspired by this interesting value and have been contributed specifically for this volume by leading experts in the area of Game Theory. Chapters 3 through to 10 are more focused on theoretical aspects of the Shapley value, Chapters 11 to 15 are related to both theoretical and applied areas. Finally, from Chapter 16 to Chapter 24, more attention is paid to applications of the Shapley value to different problems encountered across a diverse range of fields. As expressed by William Thomson in the Introduction to the book, "The chapters contribute to the subject in several dimensions: Mathematical foundations; axiomatic foundations; computations; applications to special classes of games; power indices; applications to enriched classes of games; applications to concretely specified allocation problems: an ever-widening range, mapping allocation problems into games or implementation." Nowadays, the Shapley value continues to be as appealing as when it was first introduced in 1953, or perhaps even more so now that its potential is supported by the quantity and quality of the available results. This volume collects a large amount of work that definitively demonstrates that the Shapley value provides answers and solutions to a wide variety of problems.