Link failure decision and traffic load balancing for Ad Hoc on-demand routing protocol

Abstract

An ad hoc Network is a group of mobile hosts communicating each other without any dependence on existing infrastructure. And it has the characteristics of multi-hop, wireless link, limited bandwidth, dynamic topology. Remarked that no dependency on pre-existing infrastructure, a variety of routing protocol is proposed. Presently, query-based On-demand routing protocols became the focus of public attention. But in the spite of their low routing overhead and high convergence rate, On-demand protocols have a weak point that the performance is too low especially under congestion or low mobility condition. In this paper, We approach the reason of the low performance at the point of the Incorrect Link Failure Decision and Inherent Traffic Imbalancing. Finally we propose three novel performance enhancing techniques for all on-demand routing protocols. For catching link failures correctly and preventing excessive drops, we propose Second Chance Link Failure Decision technique. Because of the essential characteristics of On-demand routing, ad hoc network traffic can``t help to be concentrated. we propose Delayed Query Forwarding technique for establishing a route as considered traffic load of each node. And we also propose Temporary Route Update method to eliminate the bad effect of route cache in query stage. To compare the performance, the three techniques are implemented in Ad hoc On-demand Distance Vector routing protocol. The simulation results present the effect of this techniques. Packet delivery latency and total throughput are greatly enhanced.