QoS Architecture of WiMAX

QoS Architecture of WiMAX

Rath Vannithamby, Muthaiah Venkatachalam
DOI: 10.4018/978-1-61520-680-3.ch003
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WiMAX technology, based on the IEEE 802.16 standard, is a promising broadband wireless technology for the upcoming 4G network. WiMAX has excellent QoS mechanisms to enable differentiated Quality of service of various applications. QoS in broadband wireless access network such as WiMAX is a difficult and complicated task, as it adds unpredictable radio link, user and traffic demand. WiMAX supports end-to-end QoS provisioning to allow various applications and services. This chapter aims to provide a detailed overview of the QoS in WiMAX, the current and the future. Various air-interface and network mechanisms that enable the end-to-end QoS provisioning are then discussed. Finally, the novel mechanisms to improve the QoS provisioning in the next generation WiMAX system are also discussed.
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2. End-To-End Wimax Network Architecture And The Support Of Qos

In this section, we will describe the End to End operation of QoS in a WiMAX network (WiMAX Forum, n.d.a) right from the MS to the base station (BS) to the ASN-GW to the core network (CSN/NSP). We will provide insights on how E2E QoS is provisioned, setup and torn down in a WiMAX network as well as the other associated procedures for QoS in the WiMAX network.

WiMAX defines a QoS framework for the air interface. This consists of the following key elements:

  • Connection-oriented service

  • Five data delivery services at the air interface, namely, UGS, RT-VR, ERT-VR, NRT-VR and BE (IEEE 802.16e-2005, 2006)

  • Provisioned QoS parameters for each subscriber

  • A policy requirement for admitting new service flow requests

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