Efficient flooding using relay routing in on-demand Routing protocol for Mobile Adhoc Networks

In this paper an enhancement technique for Dynamic Source Routing protocol (DSR) using relay routing and flooding alternately is proposed. DSR is a popular on demand reactive routing protocol in Mobile Adhoc Networks (MANET) which uses flooding for route discovery and route maintenance when only a node has data to be transmitted. Flooding causes serious redundancy, contention and collision in the network which increases the overhead of transmission in a dynamic network where the nodes have different mobilities. In order to reduce this routing overhead we have used relay routing technique which selects only a small number of nodes in the neighbourhood of the source node for route discovery and route maintenance. Selection of the nodes is done based on the mobility of the neighbourhood nodes at that instant of time. Simulation results on DSR have shown that this technique can reduce redundant flooding to a great extent thus making DSR more efficient.