Research On Routing Protocol And Trust Model In V2V Communication

The vehicle ad hoc network(Vehicle Ad Hoc Network,VANET)design goal is to establish a platform for inter-vehicle communication,which not only improves traffic efficiency,but also brings reliability,safety and multiple conveniences to the passage of drivers.Vehicle-to-vehicle(V2V)communication,vehicle-to-infrastructure(V2I)communication,vehicle-to-person(V2P)communication and network communication between vehicle-to-sensor(V2S)are realized through the continuous updating of information and communication technology.However,in the Internet of Vehicles,vehicle-to-vehicle transmission through wireless media,and the Internet of Vehicles itself has characteristics such as dynamic topology and mobility,which put forward higher requirements for transmission quality and transmission security.The timeout of message transmission between vehicles or the transmission of false messages threatens the Internet of Vehicles and even the safety of people.The research content and main contributions of this paper include:(1)Research on routing protocol based on delay and link quality.In VANET,due to VANET characteristics such as unstable network topology,strict delay requirements,high node movement speed,and accurate positioning,the routing of data packets from the origin node to the destination node becomes a severe challenge.Therefore,the optimal routing scheme is very important for VANET to improve performance indicators such as search efficiency and end-to-end delay.This paper proposes a routing protocol based on delay and link quality to optimize the problems in VANET routing.Firstly,the pre-delay is calculated by parameters such as the transmission direction and the moving speed of the node.Secondly,the quality of the link between nodes is obtained by transmitting Hello packets,so that high-quality links are selected for transmission.Finally,a mechanism for deleting expired links is designed to ensure that no invalid nodes are added during VANET transmission,which reduces the packet loss rate of data packet transmission.Using NS3 to simulate the routing protocol,it is concluded that the proposed routing protocol based on delay and link quality has certain advantages in terms of the number of nodes,link transmission quality and delay.(2)Research on the comprehensive trust evaluation model of dynamic weights.For VANET,there are false news attacks,witch attacks,black hole attacks and other trust attacks.The attacks of malicious nodes on the Internet of Vehicles affect the safety of vehicles and people.Therefore,it is a safety guarantee to improve the communication trust between car nodes in the Internet of Vehicles and reduce the interference of malicious nodes.The dynamic weight comprehensive trust evaluation model proposed in this paper uses three trust factors to calculate the direct trust value.Filtering is performed according to the difference of the deviation of the data consistency value between the common neighbor nodes,and the credibility calculation is adopted for the nodes with low deviation,and then the indirect trust calculation is performed.Finally,analyze the relationship between historical comprehensive trust and current comprehensive trust to determine the mutual weight.Experiments verify the accuracy of the comprehensive trust value calculated by the dynamic weight comprehensive trust evaluation model.