Routing Timer Self-Adaptive Regulating Algorithm based on MIMD Loop Control for MANET

The effect of topology changing caused by nodes mobility on too much overhead occupying the limited bandwidth and resource has been greatly alleviated by a routing timer self-adaptive regulating (RTSAR) algorithm based on MIMD loop control proposed for mobile ad hoc network in this paper. Served as a stable HELLO message broadcasting algorithm, RTSAR has been designed on a fairly converging mathematical model which is established to obtain a relative stable transmission pattern. By controlling the value of routing timer, RTSAR as an independent algorithm module will help the protocol be able to send more HELLO messages in a high dynamic network to avoid frequent routing discovery processes and less in a relative stable environment to save the unnecessary control packets. Results of simulations on NS2 showed that adopting RTSAR, no matter based on a table-driven protocol or on a demand one, would reduce the overhead in networks effectively while hardly bring any obvious impacts on metrics of packet successful delivery rate and the average end-to-end delay as well.