QoS Support in Wireless Networks

QoS Support in Wireless Networks

Bashar Ahmad (Johannes Kepler University of Linz, Austria) and Gabriele Kotsis (Johannes Kepler University of Linz, Austria)
Copyright: © 2009 |Pages: 17
DOI: 10.4018/978-1-59904-984-7.ch002
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Abstract

Wireless communication has gained a great deal of attention in the last few years from both industry and academia. Nowadays, most computerized devices are equipped with wireless ports such as IEEE 802.11 WLAN, Bluetooth, or Inferred port. IEEE 802.11 WLAN device, in particular, is an ideal wireless communication tool for any mobile-based computer such as a notebook or PDA because of their low cost and high bandwidth. The wireless environment has some characteristics that make supporting QoS a very challenging task. These characteristics are bandwidth scarce, radio channel conditions that vary over the time, and highly packet loss. Legacy IEEE 802.11 standards such 802.11a, b, or g originally do not support QoS, thus many QoS enhancement schemes have been proposed; most of them focus on enhancing a particular part or mode of the standard. QoS support in any system is an accumulative task, as it needs to be maintained throughout all layers. The wireless multimedia application is the best example for proving the accumulative property for its QoS as the user is the final judge about whether the provided quality is satisfactory or not. In this chapter, we will study and analyze QoS support for wireless network and the target application, which will be a real-time multimedia application. First, we discuss QoS support for multimedia application. Second, a framework for classifying the QoS enhancements will be proposed. Next we will study QoS support in IEEE 802.11 and the new QoS extension IEEE 802.11e, and then we will study and classify the proposed QoS enhancement schemes according to the proposed framework. Finally, we will discuss mobility as an important issue for QoS support in wireless environment.

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Table of Contents
Foreword
Walid K. Salameh
Acknowledgment
Chapter 1
Baha A. Khasawneh
This chapter introduces multimedia and multimedia elements and technology that are influencing and will continue to influence much of the exchanged... Sample PDF
Multimedia Essentials and Challenges
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Chapter 2
Bashar Ahmad, Gabriele Kotsis
Wireless communication has gained a great deal of attention in the last few years from both industry and academia. Nowadays, most computerized... Sample PDF
QoS Support in Wireless Networks
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Chapter 3
Hendrik Knoche, M. Angela Sasse
This chapter provides an overview of the key factors that influence the quality of experience (QoE) of mobile TV services. It compiles the current... Sample PDF
Getting the Big Picture on Small Screens: Quality of Experience in Mobile TV
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Chapter 4
João Magalhães, Stefan Rüger
Most of the research in multimedia retrieval applications has focused on retrieval by content or retrieval by example. Since the classical review by... Sample PDF
Semantic Multimedia Information Analysis for Retrieval Applications
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Chapter 5
Truong Cong Thang, Yong Man Ro
Content adaptation currently appears to be the key solution to support the quality of service (QoS) for multimedia services over heterogeneous... Sample PDF
Modality Conversion: Toward the Semantic Frontier of UMA
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Chapter 6
Nicola Conci, Francesco G.B. De Natale
Transcoding provides ad hoc solutions for every user’s category by decompressing a video sequence and recompressing it into a different format where... Sample PDF
Transcoding vs. Scalability in Video Streaming for Heterogeneous Networks/Clients
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Chapter 7
Seung S. Yang, Javed I. Khan
This chapter provides a comprehensive awareness and understanding of research efforts in the field of extreme rate-distributed video transcoding.... Sample PDF
Extreme Rate Distributed Video Transcoding System
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Chapter 8
Ashraf M.A. Ahmad
Delivering streaming video over wireless networks is an important component for most interactive multimedia applications running on personal... Sample PDF
Semantic-Based Video Transcoding Architectures for Quality of Service Applications in Mobile and Wireless Video Communication
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Chapter 9
Panagiotis Germanakos, Constantinos Mourlas
A traditional multimedia system presents the same static content and suggests the same next page to all users, even though they might have widely... Sample PDF
Adaptation and Personalization of Web-Based Multimedia Content
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Chapter 10
Florence Agboma, Antonio Liotta
This chapter discusses the various issues that surround the development stage of mobile TV services. It highlights the importance of Quality of... Sample PDF
QoE for Mobile TV Services
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Chapter 11
Annanda Thavymony Rath, Saraswathi Krithivasan, Sridhar Iyer
Traditionally, Content Delivery Networks (CDNs) deploy proxy servers at strategic locations at the edge of the network to efficiently serve client... Sample PDF
HSM: A Hybrid Streaming Mechanism for Delay-Tolerant Multimedia Applications
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Chapter 12
Luca Superiori, Olivia Nemethova, Markus Rupp
In this chapter, we present the possibility of detecting errors in H.264/AVC encoded video streams. Standard methods usually discard the damaged... Sample PDF
An H.264/AVC Error Detection Algorithm Based on Syntax Analysis
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Chapter 13
Miguel A. Garcia-Ruiz, Samir A. El-Seoud
This chapter provides an overview of second language learning and an approach on how wireless collaborative virtual reality can contribute to... Sample PDF
Wireless Collaborative Virtual Environments Applied to Language Education
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Chapter 14
Shiguo Lian
Secure multimedia transcoding is a challenge that operates the encrypted multimedia content directly. For example, the encrypted multimedia data’s... Sample PDF
Multimedia Transcoding in Mobile and Wireless Networks: Secure Multimedia Transcoding for Scalable Video Streams
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Chapter 15
Shadi R. Masadeh, Walid K. Salameh
This chapter presents a keyless self-encrypting/decrypting system to be used in various communications systems. In the world of vast communications... Sample PDF
Multimedia Transcoding in Wireless and Mobile Networks: Keyless Self-Encrypting/Decrypting Scheme for Multimedia Transporting Systems
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Chapter 16
Paulo A.A. Esquef, Luiz W.P. Biscainho
This chapter addresses digital signal processing techniques for sound restoration and enhancement. The most common sound degradations found in audio... Sample PDF
DSP Techniques for Sound Enhancement of Old Recordings
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Chapter 17
Dan Yu, Farook Sattar
This chapter focuses on the issue of transaction tracking in multimedia distribution applications through digital watermarking terminology. The... Sample PDF
Digital Watermarking for Multimedia Transaction Tracking
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Chapter 18
Ali Al-Haj
In the last decade, many digital image watermarking algorithms have been proposed and implemented; however, algorithms based on the discrete wavelet... Sample PDF
Image Watermarking Algorithms Based on the Discrete Wavelet Transform
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About the Contributors