Research On VANET Trusted Opportunity Routing Algorithm Based On Comprehensive Feedback

As most of the nodes in Vehicular Ad-hoc Networks(VANET)are fast-moving vehicles,the mobility of the nodes makes the structure of the network topology become more complex,the distribution range of the nodes become more extensive,the threat caused by malicious nodes to routing more serious.All these uncertain factors reduce the performance of communication security and trust degree between spatial VANET nodes.One of the effective way to solve the potential security problems of VANET is to establish a trusted routing algorithm.This article conduct a detailed and in-depth study on the establishment and implementation of the VANET trusted routing algorithm.The main tasks are as follows:(1)Theoretical summary and problem analysis.This thesis analyzes the relevance of VANET and opportunistic network in the whole system,come to the conclusion that it is necessary to study both of them at the same time;analyzes the VANET technology through structure,key technology and development trend,three aspects;analyzes the opportunistic networks from routing algorithms,mobile models and typical applications three aspects;summarizes the existing problems and risks of key technology and give a technology solution.(2)The construction of the trust framework.In order to solve the security threats faced by nodes in VANET communication and improve the stability and reliability of message transmission between nodes,a VANET trust framework based on comprehensive feedback is built.In this framework,the specific calculation formulas for malicious node screening,direct trust,feedback trust,expected trust and comprehensive trust are defined in detail,the node trust degree is updated and decided to ensure that the trust degree in the node cycle.(3)Realization of trusted routing algorithm.Combined with the established trust framework,a trusted opportunistic routing algorithm based on comprehensive feedback and Spray and Focus routing(CF-SF)is designed.The algorithm realizes the management of trust,including initial assignment of nodes,effective malicious detection,trust calculation,trust update and decision-making,and definition of the corresponding punishment mechanism.The specific process implementation and the main part of the code implementation of the routing and forwarding mechanism are illustrated at last.(4)Simulation experiment and result analysis.The proposed CF-SF routing algorithm is tested from data transmission success rate,average network transmission delay,and routing load rate after a large number of simulation experiments on the ONE(Opportunistic Network Environment Simulator)simulation platform.It shows that: Compared with other routing algorithms,the data transmission success ratio of CF-SF routing is improved,the routing load is significantly reduced,and malicious nodes can be effectively detected.The overall performance is good,and it is an efficient and feasible routing solution suitable for the current development of VANET.