Performance analysis of metrics of broadcasting protocols in VANET

VANETs (vehicular ad hoc networks) are distributed, self-organized and potentially highly mobile networks of vehicles communicating via wireless media. They are a form of Mobile Ad hoc Network (MANET) where movement of each node (vehicle) is restricted by road direction, encompassing traffic and traffic regulations. The different challenges in VANET such as intermittent connectivity, abrupt changes in network topology and low reception rate distinguish it from other types of ad hoc networks. This paper covers different performance metrics encountered in recent literature, for small and large scale broadcasting protocols. Novel ideas are needed to optimize reliability and time criticality metrics in data communication protocols for VANET. The reason for analyzing the broadcasting protocols is that, in most of the emergency situations, there is less time to make a handshake with other nodes in the networks, as the emergency message is to be delivered fast and efficient. Therefore broadcast based routing protocol plays a major role in almost all the safety applications. A detailed understanding of the existing protocol is needed before contributing new protocol for the upcoming research field.