Mobility

QoS Management in a Multilayer WiMAX System

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Executive Summary

In 2008, telecommunication market trends in Africa reported 0.2% penetration for Broadband Wireless Access (BWA) technologies. IEEE 802.16 (WiMAX) is recognized as a promising technology to provide BWA for heterogeneous traffic. Among the various features defined in the standard, some features such as the scheduling algorithm is undefined. A new MDRR-based (Modified Deficit Round Robin) scheduling algorithm is proposed in this paper to maintain QoS requirements among heterogeneous traffic. The performance of the enhanced MDRR-based algorithm is compared to the existing MDRR algorithm in terms of throughput in an evenly-distributed and mixed traffic scenario. Maximum throughput of 68 kbps and 112 kbps were attained by the 20% and 40 % latency MDRR-based algorithm respectively while only 56 kbps was achieved by the MDRR algorithm.

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