Quality Controlled Intermediate Route Repair Routing Protocol

The recent research works in wireless networks prompt the opportunistic transmission that exploits channel fluctuations to improve the overall system performance. In wireless ad hoc networks, nodes may have packets destined to multiple neighbour nodes. We consider a probe based link quality measurement that takes advantage of a time - varying channel among different receivers to improve system performance. Current ad hoc wireless routing protocols have their routes chosen with the shortest - path or minimum hop count to the destination, which tend to include longer hop-length links with possibly bad signal quality. It is expected that the routing protocol can be improved to maximise the overall throughput and satisfy the QoS requirements for the transmission flows, thereby eliminating the usage of routes with bad links. In our Quality Controlled Intermediate Route Repair Routing Protocol (QCIRTP), we modify the Ad hoc On - demand Distance Vector (AODV) routing protocol to avoid routing through bad quality links. We have also revamped the route repair mechanism of AODV to allow any of the intermediate nodes to repair a damaged link. The herein reported NS2 simulation results seem very promising and they show that our protocol provides better performance than the original AODV protocol in terms of throughput in scenarios of densely populated environments like a campus environment.