Adaptive state aware routing protocol for vehicle ad hoc network in urban scenarios

Developing multi-hop communication in vehicular ad hoc networks (VANET) is a challenging problem. The rapidly changing topology and frequent network disconnections of vehicles cause failure or inefficiency in traditional ad hoc routing protocols. This paper propose Adaptive State Aware Routing (ASAR) Protocol, which solve these problems by adaptively selecting an optimal route with an estimated transmission delay model that takes into account real-time vehicle density and average speed. Simulation results show that the proposed ASAR protocol effectively increases the data delivery ratio, and significantly reduces the end to end delay and routing overhead, which is better than other existing VANET routing protocols.