Method of cross-layer opportunistic routing for internet of vehicles based on decentralized congestion control strategy

摘要

A method of cross-layer opportunistic routing for Internet of Vehicles based on decentralized congestion control strategy includes the following steps. Design a multi-state decentralized congestion control state machine. Record, by each vehicle, a current state value, and calculate a medium access control layer channel load (CL) and an average state value (AS) of all neighbor nodes. Adaptively adjust the current state machine in combination with relationships between a CL statistical value and a preset threshold and between the s and the AS, thereby controlling a transmit power, a transmit data rate and a receiver sensitivity of Cooperative Awareness Message (CAM) and routing message. Utilize, by the vehicle node, CAM to update state information of the neighbor nodes in real time, and select to perform greedy forwarding or opportunistic forwarding of routing message according to location relationships among the vehicle node, the neighbor nodes and a target node.