In wireless ad hoc networks, designing a backoff algorithm is crucial to avoid collision and to improve the performance of nodes. Most of the existing algorithms have modified the Binary Exponential Backoff (BEB) algorithm to provide relative priority among multiple traffic classes. But the backoff interval should be adaptively adjusted based on the residual energy and traffic load of contending nodes. Hence this paper designs a priority based optimized backoff algorithm for collision avoidance. This algorithm is based on the standard IEEE 802.11 MAC protocol in which the contending nodes are prioritized based on their residual energy, load and traffic type. Then during contention period, the backoff interval is adaptively adjusted based on the priority of each contending node.
Volume 11 | 12-Special Issue