Research On Street Centric VANET Routing Protocol

As a basic supporting technology for intelligent transportation systems,VANET has become a topic research that has attracted much attention in recent years.In urban VANETs,due to frequent topology changes,the routing table has a very short validity period,resulting in large routing overhead and low efficiency.Therefore,how to design an efficient and stable routing protocol in combination with the urban environment is currently a major issue.In this paper,according to the structural characteristics of VANET network in the urban environment,considering the influence of traffic lights on vehicles,we propose the analysis of the differences in the state of vehicle movement on city streets.A segmentation-based VANET routing protocol based on road segmentation is designed by considering segmented considerations and thus predicting the motion state of the vehicle.Main tasks are as follows,(1)Aiming at the instability of routing nodes(backbone nodes)exists in existing street-centric VANET routing protocols,a network node motion model and network link lifetime model are established,and an improved LSTM algorithm is a predictive method used to implement vehicle status,which is to selecting more stable backbone nodes to establish backbone network.(2)Based on(1),fully considering the influence of traffic lights on vehicle speed and space distribution,we establish a network system model(vehicle node connection control set),and then design an on-board routing strategy RSRP based on road segmentation.In order to achieve efficient and stable network routing,we divide the urban streets into sections that are not between intersections and intersections.For certain regions,we establish a stable road backbone by selecting specific backbone nodes.The bridge nodes in the intersection area collect the delay information on the road section to establish a stable network topology.(3)Under the NS2 simulation platform,we simulate the real urban road and vehicle traffic scenarios,and compare the performance with GPSR and GyTAR routing protocols.The simulation results show that the RSRP protocol improves the average end-to-end delay by 10% and the packet delivery rate by 10% respectively.The network has better performance.