| In the intelligent transportation system,the vehicular in the Vehicular ad hoc network(VANET)can use other vehicles as nodes for data communication even in the environment without communication infrastructure.VANET has the characteristics of no center in the network,fast node movement,and frequent changes in the topology of the communication network.However,when vehicles communicate through completely open wireless channels,they are vulnerable to malicious attacks such as information tampering and discarding data packets.Therefore,how to establish a stable and reliable secure routing protocol is one of the main challenges in VANET.This paper analyzes the routing algorithm of the on-demand distance vector(AODV)routing protocol.Due to the lack of security design of AODV,the trust model reasoning in intelligent processing technology was selected to improve the algorithm as the starting point.The trust model was used to calculate the trust between nodes,improve the path selection strategy,and set up a VANET simulation platform to compare the performance of the improved protocol and the conventional protocols.The following is the specific research work:(1)Firstly,the VANET technology and the VANET simulation platform were briefly introduced.Then the requirements of VANET routing protocol are analyzed,and some classifications of classic VANET routing protocols are introduced.(2)Study the algorithm principle of route discovery,routing and route maintenance of AODV routing protocol.Since AODV is not designed with network communication security in mind,fully open wireless transmission is vulnerable to various attacks by malicious nodes in the vehicle protocol scenario,resulting in a sharp deterioration of the network communication environment.In this paper,an improved TAODV routing algorithm based on trust model processing is proposed for AODV routing establishment phase.The direct trust degree,indirect trust degree,cumulative trust measure,signal quality measure and historical trust degree between nodes are considered.By calculating the trust degree between nodes,a trusted route that satisfies the path trust threshold with a minimum number of hops and does not contain malicious nodes is provided.(3)In this paper,A VANET simulation platform composed of NS2,SUMO and MOVE is setup to perform analysis of the improve TAODV and the conventional AODV under the urban scenario.The simulation results show that the improved TAODV routing algorithm improves the packet delivery rate and the average throughput,and also effectively improve the security of VANET. |
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