Randomized Link Repair Reactive Routing Protocol for Vehicular Ad Hoc Network

Background & Objective: Vehicular Ad hoc Network (VANET) now-a-days is popular research area due to numerous challenges such as congestion control, network management, and security issues. Methods: VANET is a subtype of Mobile Ad hoc Network (MANET), therefore, allows a vehicle to exchange information with neighboring vehicles and with roadside infrastructure units. High mobility of vehicles results to frequent link breakages. The existing VANET routing protocols follow a trivial link repair mechanism. Therefore, there is a need to compute stable and reliable routes for vehicular communication as well as frequently repair the broken links. Ad hoc On-demand Distance Vector (AODV) routing protocol is a reactive routing protocol which is suitable for very dynamic environment such as VANET. In this paper, an improved Randomized Link Repair based AODV (RLRAODV) routing protocol is proposed which uses the multiple route reply packets for data transmission through alternate paths during link failure. The proposed methodology also reduces the network congestion overhead generated due to broadcasting of route request packets. Results & Conclusion: The simulation analysis shows that RLR-AODV gives better performance with respect to performance parameters such as average end-to-end delay, average packet delivery ratio, and average packet loss ratio as compared to AODV and AOMDV.