Optimal Relay Selection using Efficient Beaconless Geographic Contention-Based Routing Protocol in Wireless Adhoc Networks

In Wireless Ad hoc network, cooperation of nodes can be achieved by more interactions at higher protocol layers, particularly the MAC (Medium Access Control) and network layers play vital role. MAC facilitates a routing protocol based on position location of nodes at network layer specially known as Beacon-less geographic routing (BLGR) using Contention-based selection process. This paper proposes two levels of cross-layer framework -a MAC network cross-layer design for forwarder selection (or routing) and a MAC-PHY for relay selection. CoopGeo; the proposed cross-layer protocol provides an efficient, distributed approach to select next hops and optimal relays to form a communication path. Wireless networks suffers huge number of communication at the same time leads to increase in collision and energy consumption; hence focused on new Contention access method that uses a dynamical change of channel access probability which can reduce the number of contention times and collisions. Simulation result demonstrates the best Relay selection and the comparative of direct mode with the cooperative networks. And Performance evaluation of contention probability with Collision avoidance.