Research Of The Improvement For The Routing Protocols In Vehicular Ad Hoc Networks

Vehicular Ad hoc network (VANET), as one of the basis of intelligent transportsystems, provides a mobile communication platform for vehiculars to improve trafficefficiency, reduce traffic accidents and make users access Internet more convenientlyand rapidly. Because of the particularity of VANET, such as the changing of thetopology, the limited bandwidth, the interference of the traffic, how to design aneffective routing protocol to ensure that the data could be delivered efficiently hasbeen a popular question.In this paper, the architecture, features and applications of VANET areintroduced. And the current representative routing protocols for VANET are classifiedand compared. GPSR (Greedy Perimeter Stateless Routing) routing protocol is one ofthe most popular VANET routing protocols used in urban scene. In this paper, aimproved GPSR routing protocol is proposed, which considers not only the distancebetween neighbor nodes and the destination nodes when choose the node to send data,but also the direction that the data need to be delivered. Simulation results show thatcompared with GPSR, the improved GPSR routing protocol has got a higher packetdelivery rate, lower packet loss rate and end-to-end delay.GPSR can achieve good results in the highway scene, but not very satisfactoryresults in urban scene, because of the more complex environments such as buildingthat may block the signal. Therefore, one geographical location based routing protocolfor urban scene is proposed in this paper, which considered both the locations of thenodes and the informations of the road that driving on, to get a more reasonableanswer. The simulation results show that the algorithm has got a packet delivery rate,packet loss rate and delay better than GPSR.