Routing Optimization Algorithm for Internet of Vehicles Empowered by Symbiotic Radio and DAG

Based on the development of mobile Internet of Things (IoT), communication networks and infrastructure, intelligent transportation systems are gradually becoming informatization and intelligence. The Internet of Vehicles (IoV), has problems such as fast node movement, frequent network topology changes, and poor link stability. This paper considers the driving characteristics of vehicle nodes in high-speed driving conditions, the factors of vehicle speed and relative vehicle distance, and the auxiliary routing transmission of road side units deployed around the road are comprehensively considered. Symbiotic radio equipment installed near the Road Side Unit (RSU) for anti-interference, and used to improve spectral efficiency and anti-interference. For delay-tolerant data, a blockchain Directed Acyclic Graph (DAG) structure for vehicle travel routes is proposed. The decision of the packet routing transmission vehicle is planned through the topological route of the DAG. The simulation experiment analysis demonstrated the optimized routing decision algorithm proposed in this paper can effectively improve the data packet delivery rate of routing transmission, and provide efficient and safer data transmission for the IoV network.