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A Channel-Aware Uplink Scheduling Algorithm for Mobile WiMAX Networks

Authors:
Nada ElShennawy
Mahmoud Fahmy
Mohammed Elderini
Moustafa Yousef

Keywords: WiMAX Networks; IEEE 802.16e; channel-aware algorithms; scheduling schemes; QoS

Abstract:
There has been a rapid growth of new Internet services, such as video conferences, online video games, and multimedia applications, offered to end users. These services need to satisfy their quality requirements, and thus an efficient scheduling algorithm is needed. In the literature, the interest is focused on throughput and delay as inputs to the scheduler in its bandwidth allocation decision. Jitter, though of great significance, did not receive considerable attention, yet. Researchers, in the area of WiMAX networks, often recommend weighted scheduling algorithms with dynamic weight functions. The channel quality is particularly important as well in scheduler decision in wireless networks for the determination of channel strength. In this paper, we develop an uplink channel-aware scheduling algorithm for mobile WiMAX networks. Use is made of a weight function with four terms: throughput, delay, jitter, and channel quality. A comparison is made between the proposed algorithm and two famous channel-aware algorithms, namely, proportional fair scheme (PFS) and maximum carrier-to-interference ratio (Max C/I). Simulation results, obtained by an OPNET simulator, reveal that our algorithm outperforms both PFS and Max C/I with respect to WiMAX delay and jitter, as functions of the number of mobile stations. However, the WiMAX throughput takes on a slightly lower value. For real-time applications, the algorithm is applied to a video conference and high quality video applications, and better values for both delay and jitter are attained in both application types.

Pages: 180 to 185

Copyright: Copyright (c) IARIA, 2014

Publication date: June 22, 2014

Published in: conference

ISSN: 2308-4219

ISBN: 978-1-61208-347-6

Location: Seville, Spain

Dates: from June 22, 2014 to June 26, 2014