Optimized local route repair and congestion control in Mobile Ad hoc Network

Mobile Ad hoc Network (MANET) is a collection of wireless mobile nodes which are autonomous, self organized and dynamic in nature. In this network due to mobility nodes are moving randomly, resulting in topology change. This topology change leads to frequent breakage of link. To repair the broken link AODV and DSR uses broadcasting mechanism. Broadcasting floods control packets. Flooding results in congestion due to limited buffer space, bandwidth, and battery power of mobile nodes. Congestion leads to dropping of packets resulting in decrease of network performance. Congestion can be avoided if the numbers of control packets are reduced. In this paper a new algorithm is proposed which avoid the congestion and repair the broken link by choosing a set of limited nodes for alternate route based on the quadrant position, battery status, queue length, and forwarding region. The proposed solution is termed as Improved Optimum Angle Selection AODV (IOAS-AODV) routing algorithm. This proposed solution is implemented, tested and the performance is analyzed. From the results it is observed that the proposed solution improves the routing performance such as throughput, end to end delay, routing overhead, and packet delivery ratio.