Mitigating Collisions in Sidelink NR V2X: A Study on Cooperative Resource Allocation

New Radio (NR) Vehicle-to-Everything (V2X) Sidelink (SL), an integral part of the 5G NR standard, is expected to revolutionize the automotive and rail industries by enabling direct and low-latency exchange of critical information between traffic participants independently of cellular networks.However, this advancement depends primarily on efficient SL resource allocation.Mode 2(a) is a well-known method for this purpose, where each node autonomously selects resources.However, this method is prone to packet collisions due to the hidden-node problem.In this paper, we propose a cooperative scheduling method that could potentially address this issue.We describe an extension of Mode 2(a) that allows nodes to share resource allocation information at two hops.Initial simulation results show a promising improvement over Mode 2(a).