Efficient Local Route Repair Mechanism for AODV protocol in MANETS

Abstract

A Mobile Ad-hoc Network (MANET) is a continuously self-configuring, infrastructure-less network of mobile devices connected without wires. A mobile ad hoc network is an autonomous system of mobile nodes connected by a wireless link. A MANET does not have any access point or does not depend on any central administrator. In a large scale ad hoc networks, there is a continuous node mobility may cause radio links to be broken frequently. When there is a substantial increase in the degree of mobility of the wireless network more link errors are likely to occur. When this happens, route repair is typically performed to establish a new route. Such route repair mechanisms suffers with the problems like high control overhead and long packet delay making them inefficient due to frequent failures of intermediate connections in an end-to-end communication. When there is a breakage in the intermediate link, it is better to discover a new route locally without resorting to an end-to-end route discovery. Therefore to overcome from these consequence propose a new idea on local route repair (LRR) mechanism that the repair is confined to the surrounding area of the broken link is proposed to reduce the reaction time of recovery and the routing overhead. The route repair idea is implemented by improving repair mechanism in the widely accepted Ad hoc On-demand Distance Vector (AODV) protocol. The proposed version of AODV routing protocol with route repair scheme overcomes the disadvantages of its antecedent. Where as in the proposed version of AODV, nodes in the active path between source and destination act as a virtual source when link breakage occurs and there by the search process is continued till the link is formed to reach the original destination is reached. The improved local route repair mechanism is contributed with the anticipation of link breakage. This mechanism achieves better performance when compared to existing local repair mechanism.