On the Design of Sidelink for Cellular V2X: A Literature Review and Outlook for Future

Connected and fully automated vehicles are expected to revolutionize our mobility in the near future on a global scale, by significantly improving road safety, traffic efficiency, traveling experience. Enhanced vehicular applications, such as cooperative sensing maneuvering or vehicle platooning, heavily rely direct connectivity among vehicles, which is enabled sidelink communications. In order set ground for core contribution of this paper, we first analyze main streams cellular-vehicle-to-everything (C-V2X) technology evolution within Third Generation Partnership Project (3GPP), with focus air interface. Then, provide comprehensive survey related literature, classified critically dissected, considering both Long-Term Evolution-based solutions 5G New Radio-based latest advancements that promise substantial improvements terms latency reliability. The wide literature review used basis finally identify further challenges perspectives, may shape C-V2X developments next-generation beyond 5G.