Research On AODV Communication Protocol Of Vehicle Network Based On High Adaptability

With the continuous development of the automobile industry and the continuous improvement of the concept of smart cities,automobiles have become more and more important in human life.Therefore,the requirements for traffic conditions in the urban environment are also increasing.Vehicles Ad-Hoc Networks(VANETs),as a major part of the Intelligent Transportation System(ITS),are attracting more and more researchers.The car network is not only a communication connection network between vehicles,but also an interaction application based on the vehicle and other entities.Collaboration between various traffic elements through the network is important to solve problems such as traffic safety,traffic efficiency and environmental pollution.Therefore,this paper proposes and designs a high connectivity routing protocol algorithm based on vehicular ad hoc networks for different scenes in the city.Aiming at the complexity and diversity of urban scene,an improved AODV routing protocol based on network topology changes(ntcaodv)is proposed in this paper.The main work of this paper is as follows:(1)in view of the current situation of frequent changes in network topology,a highly adaptive link selection algorithm based on node operation state is proposed.By selecting the nodes participating in the link establishment in the route discovery and establishment stage,discarding the "minimum hop" connection strategy,and adopting the "optimal stability" connection strategy,a more stable link connection can be established,which can improve the data transmission power and link stability to a certain extent.(2)Aiming at the flooding process of the route request phase information,combined with the time of the original path establishment,the route discovery method based on the extended loop was improved.This method can effectively reduce the average end-to-end delay in the message transmission process,thereby improving the adaptability of the routing algorithm to different density scenarios.(3)With the design idea of "best stability",establish a backup route based on the stability of the link and improve the route maintenance process,so as to perform fast link repair to improve the effectiveness of information transmission.(4)The Linux system is ported on the zynq development board,which is developed independently,and the preparation is made for building a hardware in the loop platform for routing protocol simulation.On the NS-3 simulation platform,the improved NTCAODV routing protocol,classic AODV routing protocol and DSDV routing protocol are simulated in three different mobile models and the obtained results are analyzed.By comparing and analyzing the obtained data transfer success rate and the average end-to-end delay evaluation index,it can be concluded that compared with other routing protocols,although the NTCAODV routing protocol proposed in this paper guarantees by sacrificing certain delay in sparse urban environments Higher data transmission success rate,but in a dense urban environment has a better data transmission success rate and lower average end-to-end delay,which can achieve high adaptability of vehicle network routing protocols to different urban scenarios.