Multipath Routing Protocol for Reducing Congestion and Delay in MANET

In this paper, a congestion aware multipath routing protocol in mobile ad hoc networks (MANET) is proposed. The paths which have better bandwidth will be initially selected. For selected paths, first the congestion status of the node is found by using the early congestion detection technique which is based on the queue status and data arrival rate of the nodes. The delay includes weighted channel delay and buffer queuing delay. The paths which have better bandwidth will be initially selected. . If the congestion status is lower than the threshold value, the packets are sent direcrly through the path. If it is more than the threshold value, a congestion aware routing is initiated. In this congestion aware routing, routes having less end-to-end delay will be selected from the backup routes, so that they have low congestion. Simulation results show that the proposed protocol reduces the end-to-end delay and increases the packet delivery ratio.