Resolving spatial unfairness problem with reduced-handshaking in underwater acoustic sensor network

摘要

Underwater acoustic channel, characterized by long propagation delay and low data rate, suffers from space time uncertainty which causes spatial unfairness in underwater sensor network. In this paper, we propose a spatially fair MAC protocol which divides all the neighbor nodes of a receiving node into two groups by comparing their propagation delay with the average propagation delay of the receiving node. The receiver then permits a single node from each group based on their "earliest transmission time" in such a way that the chosen nodes do not collide with each other. We develop a simulation model to evaluate the performance of our proposed scheme. Simulation results show that the proposed scheme achieves better performance in terms of average RTS collision, network throughput and CTS success rate compared to the existing SF-MAC protocol.