A delay-based optimum routing protocol scheme for collision avoidance applications in VANETs

Broadcast transmissions are currently finding extensive applications in vehicular ad-hoc networks, albeit primarily in the research phase. Given the importance of knowing the updated network details of each node in the network, and also considering the fact that the delay in transmission of messages is a crucial factor in collision avoidance, it is imperative to implement a broadcast network which will ensure minimum delay in transmission of messages between the nodes. In this paper, we primarily implement a multi-hop broadcast vehicular network for collision avoidance. We consider the mobility and traffic density of vehicles and simulate the end-to-end delay in message transmission for a sparse and dense network scenario. In order to ensure high reliability and get the optimum delay, we extend the scenario to include three different routing protocols - AODV, Cluster-based routing and OSPF - and perform a comparison based on the end-to-end transmission delay to determine the optimum routing algorithm. In order to account for all possibilities, the case of link failure as a consequence of sparse network scenario is also considered.