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Wireless Local Area Networks Quality of Service: An Engineering Perspective

ISBN: 978-0-7381-5673-6
200 pages
March 2008
Wireless Local Area Networks Quality of Service: An Engineering Perspective (0738156736) cover image
This book is part of the IEEE Standards Wireless Networks Series. This book describes Wireless Local Area Networks Quality of Service enhancements. Those enhancements enable the support of real-time applications such as voice and video. The scope of the book includes: - Overview of QoS mechanisms and architectures. - WLAN QoS mechanisms and relationship to QoS general architectures. - Performance analysis and case studies. WLAN QoS planning and engineering are challenging tasks to both network operators and end users. This book is an attempt to satisfy the need for better understanding of WLAN QoS features as well as the related engineering challenges. The reader will be able to understand WLAN QoS mechanisms and features in a simple and clear way beyond that obtained by just reading standard documents. The reader of the book should be able to understand: - WLAN QoS basic operation. How WLAN QoS is related to other QoS architectures especially IP QoS, and the related interworking issues. - How to tackle WLAN QoS main issues including admission control, scheduling, and buffer management. How to engineer a WLAN-based network to support QoS-based applications.

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Chapter 1 Quality of Service Mechanisms and Metrics.
Traffic Management Mechanisms.
Traffic Conditioning.
The Metering Function.
Admission Control.
Nodal Mechanisms.
Transmission Scheduler.
Feedback Congestion Management.
Performance Metrics.
Packet Loss.
Simple Queueing Models.
MM1 Queueing System.
MG1 Queueing System.

Chapter 2 QoS Architectures.
Reservation Model.
Reservation Model Example.
Service Types.
Differentiation Model.
Differentiating Model Examples.
IEEE Standard 802.1Q Ethernet Frame Priority.

Chapter 3 IEEE Standard 802.11 Overview.
IEEE 802.11 Architecture and Frame format.
IEEE 802.11 PHY Overview.
IEEE 802.11a PHY.
IEEE 802.11b PHY.
The IEEE 802.11g PHY Overview.
The IEEE 802.11 MAC Overview.
Distributed Coordination Function (DCF).
Point Coordination Function (PCF).
Power Management.
IEEE 802.11 Throughput.
IEEE 802.11 Frame Types.
A Queueing Model for PCF Performance.

Chapter 4 IEEE 802.11 QoS Features.
IEEE 802.11e MAC Overview.
Data Frame Format.
Association to QoS BSS.
EDCA Operation.
HCCA Operation.
Admission Control.
EDCA Admission Control.
HCCA Admission Control.
Direct Link Setup.
Block Acknowledgment (BA).
Power Management Using APSD.
WiFi Multimedia (WMM) Specification.
IEEE 802.11n (High Throughput) MAC Features.
A Simple Engineering Example.

Chapter 5 Interworking with WLAN QoS.
Common WLAN Deployment Scenario.
WLAN QoS Interworking with Ethernet.
WLAN QoS Interworking with IP Networks.

Chapter 6 Concluding Remarks.



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Osama Aboul-Magd holds a Bachelor of Science degree in Electrical Engineering from Cairo University, as well as an M.A.Sc. and Ph.D. from the University of Toronto. As a Senior Advisor for Nortel Networks, he is involved in the planning and design of QoS and traffic management features for many products covering multiple technologies including Frame Relay, ATM, IP, and Ethernet. In addition to his interest in WLAN QoS and MAC related issues, Mr. Aboul-Magd has made numerous contributions to the standards development community. He was a key leader in the ATM Traffic Management specification at the ATM Forum and editor of the Ethernet Traffic Management Specification at the Metro Ethernet Forum. Mr. Aboul-Magd also co-authored the IETF (MPLS WG) proposed standard, Constraint-Based LSP Setup Using LDP and was a primary author of the OIF optical user-network interface (O-UNI) implementation agreement, OIF2000.125.6, Sept. 2001. In 2003, he began participating in the IEEE 802.11 Working Group, increasing his involvement in the standards development process. Throughout his career, Mr. Aboul-Magd has developed over twelve patents in various technology arenas.
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