Research Of Routing Protocols In Vehicular Ad Hoc Networks

Vehicular Ad hoc network, as a vital part of Intelligent Transportation Systems (ITS), emerges at the right moment with the rapid development of automotive industry and wireless communication technology. It not only expands drivers" field of vision, makes the road safety warning and enhances the utilization of urban traffic road, but also provide Internet access points and service of data entertainment, thus to enrich the traveling environment. However, traditional Ad hoc network routing protocol cannot adapt to the ever-changing network topology because urban traffic situation is becoming more and more the complicated. Hence, choosing appropriate vehicular Ad hoc routing protocols is mainstream direction in the research of vehicular communication technologies.Similar to the mobile Ad hoc network, vehicular Ad hoc network is a kind of centerless, multi-hop and rapid self-organized networks. The basic idea is that using the real time communication between cars to ensure the data interaction about location information, speed and sensor aware. Meanwhile, to provide more data services through the data transfer between cars and road-side primary communication infrastructures is also necessary.Choosing a proper node mobile model is quite important to reproduce the network condition of urban traffic. This thesis analyses vehicular behaviors and characteristics on the basis of researching on random waypoint model. This thesis also generates urban traffic files and high-way scenario files which are used in NS2simulation by VanetMobiSim simulator. The network performance of three routing protocols AODV. DSR and GPSR were analyzed, and finally a conclusion is drawn that GPSR routing protocol performs better than the other two at the complicated traffic scene. Under the circumstance of discrete nodes in high-way scene, simulation result shows that network performance of AODV routing protocol rivals that of GPSR routing protocol and the complexity of network topology is the key factor to influence routing protocol. Considering that AODV routing protocol is mature stable and simple, it is more suitable in this scene to some extent. Finally, The author of this thesis provides that parameters of routing protocol should be properly customized according to real-life scenarios model thus to enhance Vehicular Ad hoc network performance.