Research On Congestion Control In Wireless Mesh Network Based On AODV Routing Protocol

AODV routing protocol which is characterized by a controlled load is low, low cost and low power consumption of bandwidth and so on, it is an on-demand routing protocol. In this paper, indepth analysis of the working principle of AODV routing protocol, AODV routing protocol found inadequate and proposed a modified scheme. In AODV routing protocol, node maintains only one route to a given destination node, rather than two or more routes. It should re-initiate route discovery process when this route fails, in order to establish a new route path. For this shortcomings, proposed an multi-path routing protocol that extension of AODV. Each source node maintaining two or more routes, when the primary route path fails, the packets will be send through the backup route path. Route discovery process will be re-initiate only when the backup path failure. In this case, an alternate path is not used when the primary path is valid. It may also consume network resources to maintain it. On this basis, we propose a priority-based multipath routing protocol that can reduce the route congestion. This routing protocol improves the packet delivery ratio, reduce the frequency of route discovery, routing overhead and congestion. In this paper, first analyzes AODV routing protocol and extended multi-path routing protocol based on it. Then analysis and modeling of the routing protocol. Finally realize the simulation of improved AODV routing protocol based on NS2 simulation platform. Compared with other improved protocols based on AODV, it prove that it is possible to reduce count of route discovery process, routing overhead and node congestion while the topology is rapid changing.