Evaluating QoS in a Multi-Access Wireless Network

Evaluating QoS in a Multi-Access Wireless Network

Ronan Skehill (University of Limerick, Ireland), William Kent (University of Limerick, Ireland), Dorel Picovici (University of Limerick, Ireland), Michael Barry (University of Limerick, Ireland) and Sean McGrath (University of Limerick, Ireland)
DOI: 10.4018/978-1-59904-820-8.ch001
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Abstract

This chapter introduces quality of service in multi-access wireless networks. Specifically it demonstrates how QoS is implemented in IEEE 802.11 and UMTS. The chapter explains how these complementary technologies, when coupled together, provide a network that is greater than its individual parts. Combining these networks brings new network management challenges. To this end, the impact of joint admission control strategies on quality of service is evaluated. The evaluation is performed on an advanced test platform that replicates an integrated Release 4 UMTS network and standard IEEE 802.11b network. The results show that when UMTS and WLAN are tightly coupled, the end user enjoys a higher level of quality of service.
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Introduction

Mobile network configurations are becoming increasingly complex. Wireless communication networks are migrating from a set of insular competitive technologies toward a heterogeneous or converged wireless access topology comprising a diverse range of radio interfaces. Cells from different radio technologies overlap in the same area resulting in co-existing layers of access technology. In this complicated environment, a multi-mode mobile can connect to different cells and unless there is knowledge about each cell it is difficult to optimise network performance and to manage resources efficiently.

Multi access or heterogeneous networks provide additional capacity for data traffic with the potential for load balancing of other services when the network becomes congested. This can be achieved through targeted admission of certain classes of traffic (e.g., background/interactive) when the session starts, or by forcing the handover of selected traffic.

There has been great interest recently in the convergence of distributed, mobile networks and more localised wireless access technologies. As illustrated in Figure 1, universal mobile telecommunications system (UMTS) and IEEE 802.11 Wireless LAN (WLAN) represent two wireless technologies that show great promise in terms of interoperability and integration. UMTS was built from the ground up to support high levels of quality of service (QoS) for packet-based services in addition to providing voice in a macro-cellular environment. IEEE 802.11 WLAN is a contention based wireless access technology designed to provide high data rates with a micro-cellular footprint. The interworking approach taken in the ARES testbed embeds WLAN into the UMTS radio access network (RAN). Since foundation level QoS was not part of the initial design of WLAN, it can be viewed as a complementary source of bandwidth for non-realtime critical services such as Web and e-mail in a UMTS system. Diverting background/interactive traffic to WLAN allows UMTS to support a higher number of voice and video calls, reducing call blocking rates.

Figure 1.

Multiple wireless technologies converged can provide improved QoS to the end user

Top

Introduction

Mobile network configurations are becoming increasingly complex. Wireless communication networks are migrating from a set of insular competitive technologies toward a heterogeneous or converged wireless access topology comprising a diverse range of radio interfaces. Cells from different radio technologies overlap in the same area resulting in co-existing layers of access technology. In this complicated environment, a multi-mode mobile can connect to different cells and unless there is knowledge about each cell it is difficult to optimise network performance and to manage resources efficiently.

Multi access or heterogeneous networks provide additional capacity for data traffic with the potential for load balancing of other services when the network becomes congested. This can be achieved through targeted admission of certain classes of traffic (e.g., background/interactive) when the session starts, or by forcing the handover of selected traffic.

There has been great interest recently in the convergence of distributed, mobile networks and more localised wireless access technologies. As illustrated in Figure 1, universal mobile telecommunications system (UMTS) and IEEE 802.11 Wireless LAN (WLAN) represent two wireless technologies that show great promise in terms of interoperability and integration. UMTS was built from the ground up to support high levels of quality of service (QoS) for packet-based services in addition to providing voice in a macro-cellular environment. IEEE 802.11 WLAN is a contention based wireless access technology designed to provide high data rates with a micro-cellular footprint. The interworking approach taken in the ARES testbed embeds WLAN into the UMTS radio access network (RAN). Since foundation level QoS was not part of the initial design of WLAN, it can be viewed as a complementary source of bandwidth for non-realtime critical services such as Web and e-mail in a UMTS system. Diverting background/interactive traffic to WLAN allows UMTS to support a higher number of voice and video calls, reducing call blocking rates.

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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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