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In the IEEE 802.16 standard, Initial Ranging (IR) is defined as the mechanism of acquiring the correct timing offsets and power adjustments such that the Subscriber Station (SS) is co-located with the Base Station (BS). Bandwidth Request (BWR) is the process by which the communication is established between BS and SS requesting the uplink bandwidth allocation. In this, we evaluate the performance of these two schemes based on the metrics of delay and throughput. Then we enhance their performance by incorporating circularity. Circularity is a paradigm that allows the identification of specific groups of packets or events. Using this, we introduce delay control and backoff window control in the case of IR and selective dropping of BWR packets. This new paradigm reduces the collisions among request packets and thereby, improves both these mechanisms. The evaluation and enhancement are performed through extensive simulated studies.

Evaluation And Enhancement Of Performance Metrics For Ir And Bwr In Mac 802.16