Reliable and Efficient Dissemination of Traffic Events Among Vehicles Associated with Different Operators by Using Cellular V2X

It is expected that continuous development of Intelligent Transportation Systems (ITS) will further improve the safety and convenience of road traffic. Cellular V2X (C-V2X), as a next-generation V2X communication technique, has attracted much attention recently. C-V2X supports direct communications with sidelink as well as cellular communications. Vehicles associated with the same operator can use both interfaces to communicate with each other, but the communication between vehicles associated with different operators has not been well studied yet. In this paper, we study how to use C-V2X to efficiently and reliably disseminate traffic event information among vehicles associated with different operators. First, in the basic method, we investigate the combination of sidelink and cellular communications. Next, we propose a sidelink based relay scheme so as to improve the dissemination rate across operators, and improve radio resource efficiency by reducing redundant communications from two aspects. Simulation results confirm that compared with the basic method, the proposed method improves event dissemination rate by up to 38.1% and reduces event duplicate rate and the number of resource blocks by up to 82.0% and 57.5%, respectively.