Towards Trusted Message Transmission For Vehicular Collision Warning System: Research And Design

Vehicle traffic safety greatly affects the safety of human life and property on the road.The Vehicular Collision Warning(VCW)system reduces the risk of accidents and greatly improves road safety through early warning of potential collision accidents.Traditional VCW system based on lasers or radars can realize real-time and efficient collision warning,but it is limited by line-of-sight constraints.With the rapid development of the Internet of Vehicles(Io V),the VCW system based on vehicle-cloud communication can achieve over-the-horizon collision warning with high service delay and poor scalability.Besides,the credibility of messages in vehicular ad-hoc network is a key issue to be solved urgently for VCW systems based on the Io V.To address the above problems,this thesis proposes a vehicular collision warning system for trusted message transmission based on vehiclular edge computing(VEC)architecture and blockchain technology.The main research contents and innovations of this thesis include:(1)Collision warning of over-the-horizon vehicles based on VECDedicating to solve the limitations of traditional technologies such as laser and radar under non-line-of-sight scenarios,as well as the high service delay of collision warning based on traditional cloud computing,an over-the-horizon vehicle collision warning system based on VEC is designed.Firstly,a VCW system architecture based on VEC is proposed,which is composed of a user layer and an edge computing layer.The vehicle at the user layer collects vehicular status information and sends it to the edge node at the edge computing layer;the edge node at the edge computing layer processes the data and provides real-time collision warning services for the vehicle.Secondly,a VCW algorithm for over-the-horizon scenarios is proposed,which detects potential collisions based on vehicular status information(e.g.,real-time location,speed,acceleration,direction,etc.)and warning thresholds.Finally,the system prototype is implemented in the real Io V environment,and the superiority of the system in achieving the low delay of safety service is verified by the comparison with the collision warning system under the traditional cloud computing architecture.(2)Transmission mechanism of vehicle trusted message based on blockchainTo solve the problem of untrustworthy messages in the VCW system,a vehicle trusted message transmission mechanism based on blockchain is proposed.Firstly,The original collision warning two-tier architecture is extended to three layers,and the cloud layer is responsible for the global vehicle authentication and authorization,as well as the system global maintenance and other functions;the blockchain is built in the distributed edge node cluster to meet the needs of efficient data maintenance.The blockchain is built in the distributed edge node cluster to meet the needs of efficient data maintenance.Secondly,a smart for contract data storage is proposed to prevent vehicle messages from being maliciously tampered with during transmission.Thirdly,the reputation evaluation smart contract is designed to accurately evaluate the credibility of vehicle information.Specifically,in view of the defects of Traditional Subjective Logic(TSL)reputation model in the vehicular reputation evaluation process,a Trust Chain and Weighted Recommended Opinion for Subjective Logic reputation evaluation model is proposed.Finally,the superiority of the new model compared to TSL in malicious vehicle identification and message reliability is verified through simulation under the Ethereum platform.