Research On Highway Traffic Accident Notification Technology Based On Vehicle-road Coordination

With the increase in the number of vehicles and the rapid development of road traffic,a series of problems such as traffic safety and road congestion have become more and more serious.Among them,the problem of highway traffic safety is particularly prominent.If an accident occurs on the highway,subsequent vehicles cannot obtain information in time,which will have a serious impact on road traffic safety on the highway.With the introduction of V2 X technology,vehicles can communicate with each other to perceive the surrounding vehicles and road environment,and obtain traffic information in real time.When an accident occurs on the highway,if the accident information can be sent to subsequent vehicles in the same direction,the driver will be reminded to slow down properly.,Timely avoidance,etc.,will be able to effectively avoid continuous rear-end collisions or secondary accidents,and effectively improve highway traffic safety.This paper first analyzes two typical V2X(Vehicle-to-Everything)technologies: IEEE802.11 p and LTE-based C-V2 X technology.And through the joint simulation of SUMO and OMNET++,a highway scene was designed for testing.The results showed that the end-to-end delay of IEEE 802.11 p was maintained at about 0.24 ms,and the packet loss rate reached up to50%.The end-to-end delay of C-V2 X is maintained between 50-55 ms,and the maximum packet loss rate does not exceed 30%.C-V2 X can provide reliable data transmission for highdensity travel.At the same time,it can better complete the implementation and evolution of V2N(Vehicle-to-Network)and V2I(Vehicle-to-Infrastructure),which has huge potential.Aiming at the highway traffic accident notification technology,this paper proposes a CV2 X scheduling algorithm based on driving directions.By analyzing the perception-based semi-persistent scheduling algorithm(SPS),it is found that the SPS scheduling algorithm has great randomness.Based on this,this paper proposes a C-V2 X scheduling algorithm based on driving direction.Based on V2V(Vehicle-to-Vehicle)and V2R(Vehicle-to-RSU)technologies,the highway accident information is transmitted to the subsequent vehicles in the same direction,reducing the reaction rate.The interference of vehicles to resources and channels is analyzed,and the influence of vehicle density and speed on the packet loss rate in V2 V and V2 R scenarios is analyzed through experiments.The simulation results show that the packet loss rate using the SPS algorithm in the V2 V accident-free vehicle scenario is up to 25%,while the packet loss rate using the resource scheduling algorithm based on the direction of travel has dropped from25% to less than 20%;in the V2 R vehicle with accident There is not much difference between the scene and the V2 V accident-free vehicle scene.The resource scheduling algorithm based on the driving direction can effectively improve the communication efficiency and ensure the reliability of data transmission in the high-density scene.Because RSU has a long communication range,in the event of a traffic accident,it can quickly transmit accident information to distant vehicles,effectively improving road safety and efficiency.