Performance Enhancement of BWR Mechanism in 802.16 WiMAX Networks by Cyclic Prefix Insertion and Circularity
In the IEEE 802.16 standard, BandWidth Request (BWR) is the mechanism by which the Subscriber Stations (SS) communicates its need for uplink bandwidth allocation to the Base Station (BS). In this paper, the authors evaluate the performance of this scheme based on the metrics of delay and throughput. Then, they enhance its Medium Access Control (MAC) layer performance by incorporating circularity. Circularity is a paradigm that allows the identification of specific groups of packets or events. Using this, they introduce selective dropping of BWR packets. This new paradigm reduces the collisions among request packets and thereby, improves these mechanisms.