Efficient backup routing scheme in AODV with unidirectional links

Ad hoc on Demand Distance Vector Routing Protocol (AODV) is an on-demand routing protocol for mobile ad hoc network with low power consumption as well as low-bandwidth overhead. The routing table in AODV, however, maintains only one route to the specified node. Therefore, the source node needs to re-initiate route discovery process whenever route failure occurs which leads to increase in routing overhead and end-to-end delay. This paper presents a mechanism based on Backup paths, to overcome the route failures and selective flooding mechanism to minimize the average end-to-end delay in AODV with unidirectional links. Proposed mechanism is implemented in NS-2 simulator, and, on an average 40% reduction in average end-to-end delay is achieved and routing load is reduced when compared to the work reported earlier.