MP-VRCR: A Multi-Dimension and Priority-Based Vehicle-Road Collaborative Routing Protocol

With the requirements of time-sensitive and highly reliable applications, it is difficult to implement emerging communication technologies in internet of vehicles. Literature works are dedicated to improving the reliability and efficiency of data delivery, to address problems such as high and unstable End-to-End (E2E) latency, high network overhead. This paper explores the routing protocol with assistance of core network to provide high-reliability and low-latency data delivery services. We propose a Multi-dimension and Priority-based Vehicle-Road Collaborative Routing (MP-VRCR) protocol to improve the efficiency and reliability of data delivery. Specifically, MP-VRCR utilizes multi-dimension indicators to evaluate the data delivery capability of candidate devices, considering trajectory similarity of data, predicted buffer time, buffer occupation and distance cost. Furthermore, MP-VRCR evaluates device priority based on geographical information, selects optimal next-hop device, and evaluates data priority to order data forwarding. Then, MP-VRCR updates the congestion status of network relay devices according to buffer occupation. Vehicles carry data bypass congested network relay devices to reduce the E2E latency. Extensive simulation results show that MP-VRCR significantly outperforms other baseline algorithms regarding delivery ratio, overhead, average delivery latency.