The Multi-factor Decision Routing Protocol Based On Network Connectivity In VANET

In recent years,The rapid development of the automotive industry,the electronic communications,computers,and other fields,Intelligent Transportation System(ITS)in an unprecedented booming development,The related technology of Vehicular Ad-hoc Network(VANET)as an important part of Intelligent Transportation System,has been more and more scholars pay attention to and study.And the development of VANET routing protocols is the core of VANET related research status,will have a significant impact on the performance of the vehicular communication system.Different from traditional Ad Hoc networks,VANET network topology change more frequently,more the characteristics of high speed mobile nodes,and the application range is main streets in cities and towns,the moving characteristic of vehicle nodes is limited by the traffic rules,and the layout of urban road.Therefore,design a suitable for urban scene is efficient,reliable VANET routing protocols has an important impact on Vehicular Ad-hoc Network and the development of intelligent transportation system.Multiple scenarios,many times simulation,the simulation results can be concluded that this proposed MDCR agreement has a better routing performance in city of VANET environments,and the stability is strong.Related theory in VANET technology introduced in this paper,in view of the existing classic VANET routing protocols were studied and analyzed,and summarizes the advantages and disadvantages of all kinds of routing protocols.Based on the analysis of the current city scenarios needed by the routing protocol design challenges and solving strategy,this paper proposes a multifactor decision-making based on connectivity VANET routing protocols.This routing aims at using macro path selection mechanism and micro forward mechanism to realize the reliability and effectiveness of network data packets.The agreement has the following features:(1)Adopted based on the macro Road Side Unit(RSU)auxiliary path selection mechanism,based on principles of connectivity and short path first choose the optimal transmission path,in the process of data packets,according to the optimal transmission path,design the target node and target tracking mechanism of road section,the shortest path of the real-time dynamic update is higher,assure the connectedness of transmission path;(2)forward the microcosmic mechanism design based on the scene,on the given path,the selection of optimal the next-hop on traffic environment "Road section and Intersection" phase of the opposite sex,on the basis of vehicle category discriminant method is put forward,the introduction of the Road-section Forwarding Algorithm(RFA)and Intersection Forwarding Algorithm(IFA),Use track prediction,vehicle mobile information,neighbor node location information and an intersection multiple factors such as the decline of the wireless channel information,respectively for multifactor weighted decision forward the next-hop node,and using eigenvalue vector method for the distribution of the weight coefficient;(3)design based on the number of node movement speed,neighbor nodes into account dynamic beacon exchange mechanism,in direct neighbor list node information real time capability,at the same time,reduce routing overhead and improve the routing performance.In the process of simulation,this paper use Bonnmotion produce in NS-3 simulation platform of MDCR,GPSR,GPCR,GSR,CAR agreement and no U_MDCR agreement under the macroscopic routing mechanism for routing performance simulation.This paper defines the Packet Delivery Ratio(PDR)and average End to End Delay(E2ED)routing performance indicators,through the comparison of simulation results it is concluded that the vehicle speed change and network nodes density change on the influence of by the agreement,especially in the network node density is sparse routing performance optimization effect is more significant.