An Improved GPSR Routing Protocol

The rapid movement of Vehicles which results in frequent changes in vehicle position and speed, as well as inaccuracies in predicting driver’s direction at intersections usually lead to wrong packet forwarding decisions in VANET. Consequently, a routing protocol incorporating vehicle density, moving direction and speed into GPSR in making packet forwarding decisions is hereby proposed. Key data structures were designed and MOVE was used to construct typical Grid map urban simulation scenario. The protocol was simulated using NS-2 under the urban simulation scenario and was compared with AODV and GPSR protocols. Our experimental results indicate that the improved GPSR protocol has better performance when packet delivery rate, average end-to-end delay and average throughput are used as the performance metrics, and is better for VANET under the urban simulation scenario.