Resource Management in IEEE 802.11 Based Wireless Networks

Resource Management in IEEE 802.11 Based Wireless Networks

Ming Li (California State University, Fresno, USA), Roberto Riggio (Create-Net, Italy), Francesco De Pellegrini (Create-Net, Italy) and Imrich Chlamtac (Create-Net, Italy)
DOI: 10.4018/978-1-59904-820-8.ch004
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Abstract

This chapter provides a comprehensive review of the architectures, algorithms, and protocols in the topic of resource management in IEEE 802.11-based wireless networks such as wireless LANs, heterogeneous wired/wireless networks, mobile ad hoc networks, and wireless mesh networks. The focus is given to the approaches for bandwidth allocation in different networks as well as how these strategies are incorporated in each specific protocol. Although the issues of resource management and quality of service support in different networks highly depend on the specific network architectures and mobility patterns, existing works in the literature have shown that the key issue in 802.11 networks is how to coordinate the contention based channel access by considering channel rates, network topology, interference, and mobility. With successful resource allocation schemes, sufficient quality of services can be supported to maximize user experiences with multimedia applications such as voice and video in wireless networks.
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Introduction

Next generation wireless networks will require significant flexibility on deployment so that the objective of providing seamless service to users anywhere at any time can be achieved. Having been successfully used as the ubiquitous last-mile technology in the present days, IEEE 802.11 has become the de-facto standard for providing wireless access in applications such as campus wireless LANs, wireless hotspots in hotels and airports, and military battlefields. The data rates guaranteed by the standard reach as high as 54Mbps and 11Mbps for 802.11a and 802.11b, and current research is investigating enhanced PHY layers and data aggregation techniques in order to enhance the capacity of the WLANs channels. With this availability of broadband capability in IEEE 802.11 networks, it is a natural demand that appropriate quality of service (QoS) strategies are devised so that wireless users can access multimedia data such as voice, video, and 3D animation and experience satisfactory entertainment.

Depending on the actual applications and types of networks, the issues of QoS can be quite different. For instance, in single-hop wireless LANs, it is desirable to provide sufficient quality of service for real-time flows not only within each individual wireless LAN, but also among different wireless LANs when users roam in the network. Furthermore, it is not unusual that mobile users access/exchange information in wired networks. In this case, end-to-end QoS is a must in order to better support multimedia applications such as voice over IP and online video. On the other hand, in self-organizing multi-hop mobile ad hoc networks (MANETs), it is imperative that sufficient and reliable QoS is provided from the source node to the destination node, even when significant mobility and dramatic topology change is present. In addition, the concept of multi-hop ad hoc networks can be extended to wireless mesh networks where static wireless mesh routers are installed on the top of buildings to form what is called “mesh backbone.” Existing wireless access networks can easily reach Internet via those wireless mesh routers. Since mesh routers can be equipped with multiple radios or multiple channels, the interference among different routers is reduced and thus the capacity of the mesh backbone is significantly increased. How to provide appropriate QoS by incorporating the multiple radio/channel capability is still a challenging issue.

Basically, there are two fundamental QoS issues in IEEE 802.11 based wireless networks. First, there is no QoS protocol in standard 802.11 MAC layer. Although IEEE 802.11e was proposed to prioritize the media access by stations of different priorities, how to improve the performance and provide QoS guarantee in 802.11e EDCF and HCF remains a challenge. Secondly, in multi-hop single channel wireless ad hoc networks, different links on the paths of the same flow may compete for the channel access and thus interfere with each other. In this case, it is difficult to provide high throughput. How to deal with this type of multi-hop interference and estimate the available bandwidth along a certain route is critically important for sufficient quality of service support.

Considerable works have been conducted on providing quality of service support to IEEE 802.11 wireless networks in recent years. Naturally, most approaches involve MAC layer protocol design with some approaches incorporate information at both MAC and network layers. From the network architecture aspects, these works can be classified to following categories:

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Table of Contents
Foreword
Abbas Jamalipour
Preface
Nicola Cranley , Liam Murphy
Chapter 1
Ronan Skehill, William Kent, Dorel Picovici, Michael Barry, Sean McGrath
This chapter introduces quality of service in multi-access wireless networks. Specifically it demonstrates how QoS is implemented in IEEE 802.11 and... Sample PDF
Evaluating QoS in a Multi-Access Wireless Network
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Chapter 2
Dirk Staehle, Andreas Mäder
This chapter gives an overview of the background and functionality of the high speed downlink packet access (HSDPA), and provides insights into the... Sample PDF
Radio Resource Management Strategies for HSDPA-Enhanced UMTS Networks
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Chapter 3
Nidal Nasser, Tarek Bejaoui
Major research challenges in the next generation of wireless networks include the provisioning of worldwide seamless mobility across heterogeneous... Sample PDF
Handoff Management in Next Generation Wireless Networks
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Chapter 4
Ming Li, Roberto Riggio, Francesco De Pellegrini, Imrich Chlamtac
This chapter provides a comprehensive review of the architectures, algorithms, and protocols in the topic of resource management in IEEE... Sample PDF
Resource Management in IEEE 802.11 Based Wireless Networks
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Chapter 5
Anna Sfairopoulou, Carlos Macián, Boris Bellalta
Network Technologies and Strategies (NeTS) Research Group, Universitat Pompeu Fabra, SpainThis chapter introduces the problems caused to voice over... Sample PDF
Adaptive Codec Selection for VoIP in Multi-Rate WLANs
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Chapter 6
Michael M. Markou, Christos G. Panayiotou
This chapter introduces the network buffer control techniques as a mean to provide QoS. This problem has been extensively studied in the context of... Sample PDF
Buffer Control Techniques for QoS Provisioning in Wireless Networks
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Chapter 7
Gabriel-Miro Muntean, Janet Adams
Wireless networks are becoming a part of everyday life for many people. When a mobile device has wireless LAN capability, multimedia content can be... Sample PDF
Power Saving in Wireless Multimedia Streaming to Mobile Devices
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Chapter 8
Jose Luis Jodra, Fidel Liberal, Begoña Blanco Jauregi
This chapter introduces the principal characteristics of MANETs and shows how these particularities may affect both QoS conditions and QoS... Sample PDF
Multimedia Services Provision in MANETs
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Chapter 9
Andrej Kos, Mojca Volk, Janez Bester
Commonly understood as the next generation networks (NGN), a composite environment of proven telecommunications and Internet-oriented mechanisms has... Sample PDF
Quality Assurance in the IMS-Based NGN Environment
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Chapter 10
Marcio Nieblas Zapater, Graça Bressan
This chapter discusses the quality assurance of multimedia services over IP networks from the end user standpoint and introduces the concept of... Sample PDF
Quality of Experience for Video Services
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Chapter 11
Dorel Picovici, John Nelson
Perceptual voice quality measurement can be defined as an objective quantification of an overall impression of the perceived stimulus. An... Sample PDF
Perceptual Voice Quality Measurements for Wireless Networks
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Chapter 12
Tacha Serif, Gheorghita Ghinea
This chapter describes an investigation exploring user experiences of accessing streamed multimedia content, when that content is tailored according... Sample PDF
Enhancing the Multimedia Tour Guide Experience: Transmission Tailoring Based on Content, Location, and Device Type
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Chapter 13
Harilaos Koumaras, Fidel Liberal, Lingfen Sun
The concept of PQoS, although in general it deals with the user satisfaction with a specific delivered/ requested service, is in practice... Sample PDF
PQoS Assessment Methods for Multimedia Services
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Chapter 14
Peifang Zhang, Scott Jordan
Emerging wideband code division multiple access (WCDMA) data services will likely require resource allocation to ensure that throughput targets are... Sample PDF
Scheduling and Access Control for Wireless Connections with Throughput Guarantees
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Chapter 15
Paolo Chini, Giovanni Giambene, Snezana Hadzic
Nowadays there is an increasing need of broadband communication anytime, anywhere for users that expect to receive multimedia services with support... Sample PDF
Broadband Satellite Multimedia Networks
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Chapter 16
Panagiotis Papadimitriou, Vassilis Tsaoussidis
An increasing demand for multimedia data delivery coupled with reliance in best-effort networks, such as the Internet, has spurred interest on... Sample PDF
End-to-End Support for Multimedia QoS in the Internet
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Chapter 17
Tarek Bejaoui, Nidal Nasser
This chapter introduces the cross layer design for resource allocation over multimedia wireless networks. Conventional layered packet scheduling and... Sample PDF
Cross-Layer Radio Resource Management Protocols for QoS Provisioning in Multimedia Wireless Networks
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Chapter 18
Gürkan Gür, Suzan Bayhan, Fatih Alagöz
This chapter introduces the QoS issues and support in transport protocols for wireless multimedia transmission. After an overview of the transport... Sample PDF
Transport Protocols and QoS for Wireless Multimedia
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