The IEEE 802.11 standard, currently used in wireless multihop ad hoc networks, wastes bandwidth capacity and energy resources because of many collisions. Previous studies have shown that controlling the contention window size at a given node can decrease its probability of collisions. In this paper, we propose an efficient backoff scheme and evaluate its performance in ad hoc networks. Our backoff mechanism that we devised grants node access to the channel, based on its probability of collision for a transmitted frame in comparison with those nodes in the two-hop contention area. In addition, the new stage minimum contention window size is the previous stage maximum contention window size. We use simulation experiments to evaluate the effective performance of our scheme in an ad hoc network. Our extensive ns-2-based simulation results have shown that the proposed scheme provides excellent performance in terms of bandwidth, energy awareness, end-to-end goodput, as well as packet delivery ratio.
關聯:
International Journal of Advancements in Computing Technology vol. 3, no. 1 pp.87-96
