Base Station Assisted Backoff for Broadband Wireless Access Networks

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Executive Summary

Contention based bandwidth request with Subscriber station Assisted Truncated binary exponential backoff (SAT) mechanism suffers from low contention efficiency and high access delay when transmission failure is modeled with collision due to contention, unavailability of bandwidth and channel error. In this paper, contention resolution with Base station Assisted Backoff (BAB) mechanism is suggested and an Optimum Contention Window (OCW) is derived for bandwidth request in WiMAX networks. The performance of WiMAX networks is studied with varying number of stations, error rates and the number of slots allocated for bandwidth request.

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