Research On Cross-layer Routing Based On Vehicular Ad Hoc Network

Internet of Vehicles(IoV)becomes an important part of intelligent transportation and intelligent driving,for its real-time perception of surrounding traffic environment and realizing the timely information exchange between the vehicle and the neighboring vehicles,road infrastructure and pedestrians.However,due to the influence of the high mobility of vehicle nodes and the rapid changes of network topology,it is difficult to maintain a stable communication link in Vehicular Ad Hoc Network(VANET).Therefore,it is a work of theoretical significance and practical value to design a high-reliability routing protocol for IoV,which is based on the characteristics of IoV.Focuses on the existing disadvantages of the opportunistic routing in IoV,a series of research is carried out in this paper.The main work of this paper is as follows:1.A Fair and Multistate DCC for periodic Broadcast(FMDB)based on fairness and multistate Decentralized Congestion Control(DCC)is proposed to solve the contradiction between the large number of auxiliary information storage,transmission capacity and the constrained wireless channel resource.FMDB can adaptively adjust the transmission power,data rate and receiving sensitivity of the physical layer by analyzing the channel load(CL)state of the MAC layer,to realize the reliability transmission of the safety information of IoV under different traffic density.2.Leveraging FMDB mentioned above and the existing opportunistic routing protocol GPSR,a new cross-layer opportunistic routing based on geographic information is proposed.This method improves the packet delivery ratio of routing messages and reduces the average delay and average hops.