Download or read book Management of Quality of Service in Wireless Mesh Networks written by Malik Mubashir Hassan and published by . This book was released on 2014 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years, with the dramatic improvement in Wireless Networks the need for Quality of Service in all types of the networks has been increased as well as increasing demand of new multimedia services has pushed the research on scalable video and audio streaming over wireless networks towards heterogeneous receivers in both industry and academia. The main idea behind improvement of Quality of Service is to find various methods to improve QoS, which can be used by different users according to their need. We choose Wireless Mesh Network the IEEE standard 802.11s as our principal network for experiments. We make possible that end-users can selectively decode the bit-stream according to their computational power, visualization capability, available bandwidth and network conditions to get the best quality multimedia. However, robust streaming of video over wireless networks has to deal many challenges including bit-errors, packet-losses, burst-packet-losses and many more due to varying nature of wireless networks. The effect of high error rates can be devastating for streaming of scalable video, which uses motion-compensated prediction. Many approaches dealing with the error recovery have been proposed in literature such as error resilience, error concealment, forward error correction (FEC), automatic repeat request (ARQ), path diversity and many more. However, none of these approaches can fulfill all quality criteria by it. A scalable bit-stream of video consists of a base layer and one or more enhancement layers. The base layer represents the most important part of video data while the enhancement layers serve only to refine the base layer quality hence making the performance of streaming applications that employ layered representation sensitive to losses of base layer packets. Therefore, the base layer needs to be protected more strongly as compare to enhancement layers. However, assigning unequal error protection to scalable video is more complex than non-scalable video due to layer structure. In this thesis, techniques for robust scalable multimedia streaming over wireless networks towards heterogeneous receivers are proposed. The proposed schemes are simulated and as well as implemented on the real platform developed by us with collaboration of my home University, University of Balochistan, Pakistan. After various experiments on simulator and test-bed, our results show that our proposed approaches can react to varying channel conditions with less degradation in video quality as compare to other existing approaches.

Download or read book Quality of Service Architectures for Wireless Networks Performance Metrics and Management written by Adibi, Sasan and published by IGI Global. This book was released on 2010-01-31 with total page 716 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This book further explores various issues and proposed solutions for the provision of Quality of Service (QoS) on the wireless networks"--Provided by publisher.

Download or read book Traffic and QoS Management in Wireless Multimedia Networks written by Yevgeni Koucheryavy and published by Springer Science & Business Media. This book was released on 2009-04-20 with total page 319 pages. Available in PDF, EPUB and Kindle. Book excerpt: The current book provides a final report of activity performed by the COST 290 Action, ‘‘Traffic and QoS Management in Wireless Multimedia Networks,’’ which ran from March 10, 2004, until June 3, 2008. After an introduction to the COST framework and the Action’s survey time-frame and activities, the main part of the book addresses a number of technical issues, which are structured into several chapters. All those issues have been carefully investigated by the COST 290 community during the course of the project – the information presented in this book can be regarded as ultimate for each particular topic; every open research issue addressed in the book is described carefully, corresponding existing studies are analyzed and results achieved by the COST 290 community are presented and compared, and further research directions are defined and analyzed. Because the book covers a wide area of research addressing issues of modern wired and wireless networking at different layers, starting from the physical layer up to the application layer, it can be recommended to be used by researchers and students to obtain a comprehensive analysis on particular research topics including related areas, to obtain broad and ultimate referencing, and to be advised on current open issues. COST 290 is one of the Actions of the European COST Program. Founded in 1971, COST is an intergovernmental framework for European Cooperation in the field of Scientific and Technical Research, allowing the coordination of nationally funded research on a European level.

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 Network Traffic and Quality of Service Support Trends and Standards written by Lagkas, Thomas D. and published by IGI Global. This book was released on 2010-03-31 with total page 572 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This book offers cutting edge approaches for the provision of quality of service in wireless local area networks"--Provided by publisher.

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 Guide to Wireless Mesh Networks written by Sudip Misra and published by Springer Science & Business Media. This book was released on 2009-09-15 with total page 537 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 mesh networks (WMNs). The attractiveness of WMNs, in general, is attributed to their characteristics such as the ability to dynamically self-organize and self-con?gure, coupled with the ability to maintain mesh connectivity leading, in effect, to low set-up/installation costs, simpler maintenance tasks, and service coverage with high reliability and fault-tolerance. WMNs also support their integration with existing wireless networks such as cellular networks, WLANs, wireless-?delity (Wi-Fi), and worldwide interoperability of microwave access (WiMAX). WMNs have found u- ful applications in a broad range of domains such as broadband home networking, commercial/business networking, and community networking – particularly attr- tive in offering broadband wireless access with low initial installation and set-up costs. Even though WMNs 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 wellknownchallenges areattributedtoissuesrelatingtoscalability(signi?cantdrop in throughput with the increase in the number of nodes), multicasting, offering qu- ity of service guarantees, energy ef?ciency, and security. This handbook attempts to provide a comprehensive guide on fundamental key topics coupled with new ideas and results in the areas of WMNs. The book has been prepared keeping in mind that it needs to prove itself to be a valuable resource dealing with both the important core and the specialized issues in WMNs.

Download or read book Wireless Multi Access Environments and Quality of Service Provisioning Solutions and Application written by Muntean, Gabriel-Miro and published by IGI Global. This book was released on 2012-01-31 with total page 429 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This book serves as a vital resource for practitioners to learn about the latest research and methodology within the field of wireless technology, covering important aspects of emerging technologies in the heterogeneous next generation network environment with a focus on wireless communications and their quality"--Provided by publisher.

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 Quality of Service QOS Management in Mixed Wireless Networks Using the Power Performance Measure written by Yacob T. Astatke and published by . This book was released on 2010 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt: The explosion of new wireless services is driving the need for coverage beyond traditional cellular networks to other services such as Wi-Max, wireless Local Area Networks (WLAN) and Ad-Hoc or mesh networks. A mixed network as presented in this work, combines fixed/cellular networks with Ad-hoc networks and reflects the future of wireless networks. There are two focus areas in this dissertation. First, it uses a new clustering algorithm that expands a modified k-means clustering algorithm to organize the mixed network. Second, it uses the Power Performance Measure to establish the appropriate operating point in the mixed network in order to provide Quality of Service (QoS) guarantees for time critical applications as a function of the traffic level. The results show the potential to significantly enhance QoS performance of the mixed network and maintain that performance level under operating conditions. Performance in mixed networks is especially difficult to characterize. Serving users with real time applications is a challenge for mixed networks as multiple elements complicate QoS guarantees. This work successfully develops a model for QoS in a mixed network. This work shows that a multistage clustering scheme is an effective method for organizing mixed networks and introduces a clustering scheme that jointly optimizes network performance for Signal to Noise Ratio (SNR) and for Delay using multiple distance measures. This work also demonstrates that a Power Performance Measure, which combines throughput and delay into a single performance measure is an effective tool for managing QoS in Mixed Networks. -- Abstract.

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 Distributed Medium Access Control for QoS Support in Wireless Networks written by Ping Wang and published by . This book was released on 2008 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the rapid growth of multimedia applications and the advances of wireless communication technologies, quality-of-service (QoS) provisioning for multimedia services in heterogeneous wireless networks has been an important issue and drawn much attention from both academia and industry. Due to the hostile transmission environment and limited radio resources, QoS provisioning in wireless networks is much more complex and difficult than in its wired counterpart. Moreover, due to the lack of central controller in the networks, distributed network control is required, adding complexity to QoS provisioning. In this thesis, medium access control (MAC) with QoS provisioning is investigated for both single- and multi-hop wireless networks including wireless local area networks (WLANs), wireless ad hoc networks, and wireless mesh networks. Originally designed for high-rate data traffic, a WLAN has limited capability to support delay-sensitive voice traffic, and the service for voice traffic may be impacted by data traffic load, resulting in delay violation or large delay variance. Aiming at addressing these limitations, we propose an efficient MAC scheme and a call admission control algorithm to provide guaranteed QoS for voice traffic and, at the same time, increase the voice capacity significantly compared with the current WLAN standard. In addition to supporting voice traffic, providing better services for data traffic in WLANs is another focus of our research.

Download or read book Wireless Mesh Networks written by Nobuo Funabiki and published by BoD – Books on Demand. This book was released on 2011-01-14 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: The rapid advancements of low-cost small-size devices for wireless communications with their international standards and broadband backbone networks using optical fibers accelerate the deployment of wireless networks around the world. The wireless mesh network has emerged as the generalization of the conventional wireless network. However, wireless mesh network has several problems to be solved before being deployed as the fundamental network infrastructure for daily use. The book is edited to specify some problems that come from the disadvantages in wireless mesh network and give their solutions with challenges. The contents of this book consist of two parts: Part I covers the fundamental technical issues in wireless mesh network, and Part II the administrative technical issues in wireless mesh network,. This book can be useful as a reference for researchers, engineers, students and educators who have some backgrounds in computer networks, and who have interest in wireless mesh network. It is a collective work of excellent contributions by experts in wireless mesh network.

Download or read book QoS Routing in Wireless Mesh Networks written by Tamer Ahmed Mostafa Mohammed Abdelkader and published by . This book was released on 2008 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wireless Mesh Networking is envisioned as an economically viable paradigm and a promising technology in providing wireless broadband services. The wireless mesh backbone consists of fixed mesh routers that interconnect different mesh clients to themselves and to the wireline backbone network. In order to approach the wireline servicing level and provide same or near QoS guarantees to different traffic flows, the wireless mesh backbone should be quality-of-service (QoS) aware. A key factor in designing protocols for a wireless mesh network (WMN) is to exploit its distinct characteristics, mainly immobility of mesh routers and less-constrained power consumption.

Download or read book Rate Allocation and QoS Support in Wireless Mesh Networks written by Bo Wang and published by . This book was released on 2009 with total page 312 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 Wireless Mesh Networking written by Yan Zhang and published by CRC Press. This book was released on 2006-12-13 with total page 610 pages. Available in PDF, EPUB and Kindle. Book excerpt: A promising new technology, wireless mesh networks are playing an increasingly important role in the future generations of wireless mobile networks. Characterized by dynamic self-organization, self-configuration, and self-healing to enable quick deployment, easy maintenance, low cost, high scalability, and reliable services, this technology is beco