Quality of Service (QoS) in WiMAX

Quality of Service (QoS) in WiMAX

Kashinath Basu (Oxford Brookes University, UK), Sherali Zeadally (University of the District of Columbia, USA) and Farhan Siddiqui (Walden University, USA)
Copyright: © 2012 |Pages: 19
DOI: 10.4018/978-1-4666-0203-8.ch007

Abstract

The WiMAX technology provides wireless QoS-enabled broadband access for fixed and mobile users at the metropolitan level. It is end-to-end IP based and provides a rich set of QoS support for multimedia-based ubiquitous computing. The main contribution of WiMAX in terms of technology has been over its radio interface, which is based on the IEEE 802.16-2004 and 802.16e protocols. It is a two layer protocol stack, which provides a very robust QoS framework. At the physical layer, it focuses on optimising the use of radio resources. In the MAC layer, the main focus is on efficient scheduling and allocation of bandwidth to meet the QoS requirements of IP sessions. This chapter investigates the WiMAX architecture, its components, and the QoS support provided by the IEEE 802.16 protocol stack. It also examines mobility management issues, end-to-end QoS, and current and future application areas of the technology.
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Wimax Architecture

The WiMAX architecture defines a framework for end-to-end IP-based QoS-enabled multiservice for fixed and mobile users. It is based on the IETF standardized IP protocols and the network specification was developed by the WiMAX Forum’s Network Working Group (NWG) with input from the Service Provider Working Group (SPWG) about the service requirements.

The WiMAX network reference model is made of three logical components (Figure 1). This includes the Mobile Station (MS), the Access Service Network (ASN) and the Connectivity Service Network (CSN). Each component is characterized by a set of related functionalities and are interconnected with other components by a clearly defined set of standardized interfaces. This allows smooth interoperability between different types of vendor equipments operating at different levels of the network.

Figure 1.

WiMAX network reference model

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