Cross layer AODV with Position based forwarding routing for mobile adhoc network

Mobile adhoc network(MANET) is a ¿on the fly¿ network of mobile nodes. Packets are routed through mobile nodes instead of any fixed base station. (AODV) is most adopted routing protocol in MANET where a path is established when a node wants to communicate with another node. The period over which the communication proceeds through this path is known as a Session. When the mobility in the network is high, and the topology changes frequently the route maintenance overhead in AODV increases. The established routes are to be changes with new routes as the nodes moves away. It results in low performance as many packets are dropped when some active router node of a path moves away significantly. It also results in control overhead of route discovery that take place frequently. We improve the performance of the AODV by adopting a cross layer approach and Position based forwarding technique. In Position based forwarding, every node will maintain a set of neighbors nearest to the position of the destination. At the time of route establishment only these nodes will be selected. Hence the route lifetime improves. By a cross layer approach we design a MAC layer based approach to calculate the received power of the packets from other nodes. If the power of the packets is not sufficient (We determine a threshold value for received power based on observation) then MAC layer informs the network layer which interns removes those nodes from the routing table. Experiments are performed in OMNET++.