On adaptive contention resolution schemes for IEEE 802.16 BWA systems

Authors:
Chih-Heng Ke;Der-Jiunn Deng
Affiliations:
Department of Computer Science and Information Engineering, National Kinmen Institute of Technolgoy, Taiwan;Department of Computer Science and Information Engineering, National Changhua University of Education, Taiwan
Venue:
EURASIP Journal on Wireless Communications and Networking - Special issue on broadband wireless access
Year:
2009

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Abstract

According to the latest version of the IEEE 802.16 standard, the mandatory contention resolution method is the truncated binary exponential backoff, with the initial window size and the maximum window size controlled by the base station. However, the problem of choosing the right set of backoff parameters for the current network level remains unsolved and left as an open issue since this strategy might incur a high collision probability and the channel utilization could be degraded in congested scenario. In this paper, we propose two pragmatic adaptive algorithms, namely semi-dynamic and quasi-dynamic contention resolution schemes, that allow the base station to adjust its backoff window size based on current channel status. By controlling the size of backoff window according to varying network conditions, both schemes are able to achieve higher performance in comparison with the legacy IEEE 802.16 standard.