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.
Highlights
High-speed transmission, fast deployment, and cost saving have made Broadband Wireless Access (BWA) systems a rapidly emerging field of activity in computer networking, attracting significant interests in the communities of academia and industry
We propose that a proper choice of the size of backoff window in accordance with current channel status, which has a great influence on overall network performance
The results show that both schemes are able to achieve higher performance in comparison with the legacy IEEE 802.16 standard
Summary
High-speed transmission, fast deployment, and cost saving have made Broadband Wireless Access (BWA) systems a rapidly emerging field of activity in computer networking, attracting significant interests in the communities of academia and industry. The IEEE 802.16 contention resolution mechanism is controlled by two sets of parameters: the number of the contention slots and the backoff initial/maximum window values. In this paper, two pragmatic adaptive algorithms, namely semi-dynamic and quasi-dynamic contention resolution scheme, that allow the base station to adjust its backoff window size dynamically are proposed. Both schemes can be implemented in the present IEEE 802.16 standard with only relatively minor modifications and use very simple feedback signals.
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