Improved GPSR Routing Protocol Based On Position Vector

Vehicular Ad Hoc Networks is oriented to vehicular communication and regarded as one specific application of Mobile Ad Hoc Networks. The prospect of its applications in the intelligent transportation and entertainment services is cheerful. While the mature routing protocols of MANET is not suitble for VANET because of its different features. Therefore, it’s significant to develop special routing protocols for VANET according to its features. The paper make a research on GPSR(Greedy Perimeter Stateless Routing for Wireless Networks) protocol. Analyse how it works in detail and point out its defects in different environments.Then put forward an improved GPSR protocol based on position vector aiming at some defectsFirst of all,it introduct the VANET’s history of development and protocols on some important layers in brief. Sums up the features and difficulties of VANET in research. Next, focus on the research of routing protocol and analyse the typical routing protocols in detail. Based on the comprehensive understanding of the routing mechanism, study the suggested solution for each of defects. Based on the position vector calculation and simple redundancy elimination, GPSR protocol is modified. Morevoer, an preliminary assumption is presented special for retrograde motion. Finally, combine SUMO (Simulation of Urban Mobility) and NS2(Network Simulator version2) platform to realize analog simulation in highway scenario. Through the comparison with the original one, it proves that the improved protocol performs better.