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

TL;DR

This paper proposes a cooperative resource allocation method for NR V2X sidelink to reduce packet collisions caused by hidden nodes, showing promising simulation results over existing Mode 2(a).

Contribution

It introduces an extension to Mode 2(a) that enables two-hop resource sharing, enhancing collision mitigation in V2X communications.

Findings

Improved collision avoidance in simulations

Enhanced resource sharing among nodes

Potential for more reliable V2X communication

Abstract

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).