Research Of Routing Protocols In Vehicular Networks

As the foundation of socialist modernization construction,Intelligence Transportation System is an important part in our current country.The research of wireless sensor network technology is applying to Intelligence Transportation System, it is an very important technology. Vehicular networks is a kind of wireless sensor network, that play an important role in the transportation. Especially in traffic accident early warning, vehicle automated driving, as well as the control of a vehicle has wide application scene.It can not only improve traffic efficiency but also make the drivers and passengers more safety and more comfortable.Routing protocol is the keyboard in the network, because the wireless channel is different from traditional wired networks, it has a fast-moving, unstable topology features. These features require vehicle network routing protocols should be quickly and effectively solved these problems.This paper analyzes the wireless vehicle network routing protocol and consider vehicle routing protocol to run the real scene, the vehicle trajectory analysis and abstract motion model. The movement model is more complex than traditional wireless sensor networks of random motion model. This movement of the vehicle network generation tool for the analysis of the model, random motion model by comparing simulation and more realistic vehicle motion model, simulation results show that it is important in research of the real scene-vehicle network routing protocols.Through analyzing the trajectory of the vehicle and the traffic environment that we can be drawn, in-car network scenarios is mainly reflected in the city street scene and the highway scene. In this paper, we analyzed the vehicular movement model;then modify the simulation tool of NS2to add the obstacle element;we adding two scenarios to make the simulation environment approach the real world.As a new research area,the routing protocols of VANET is very important in VANET.After finishing the above preparations, we analyze the performance of the routing protocols in MANET. Compared with the traditional Ad hoc network routing protocols such as AODV, DSR, etc., GPSR does not store routing information,because the protocol is based on location information.Therefore, the GPSR performance better than the routing protocols of MANET. But we found that the GPSR protocol has shortcomings in urban environment,and point out that it is caused by greedy forward and perimeter forward strategy. In this paper we give some optimum ideals to optimize GPSR. Through the simulation we found that the optimum GPSR performance better than GPSR in the urban environment.