Analysis of Vehicular Safety Messaging in Cellular Networks

TL;DR

This paper models and analyzes vehicle-to-everything (V2X) safety message broadcast performance in cellular networks using stochastic geometry, focusing on user association, message reception, and network impact.

Contribution

It introduces a novel stochastic geometry model for V2X communication, analyzing user association, message reception probabilities, and network performance in shared spectrum scenarios.

Findings

Derived user association fractions for vehicle and base station connections.

Provided expressions for signal-to-interference ratio under different associations.

Quantified the effective rate impact of vehicular broadcast on cellular networks.

Abstract

This paper concerns the performance of vehicle-to-everything (V2X) communications. More precisely, we analyze the broadcast of safety-related V2X communications in cellular networks where base stations and vehicles are assumed to share the same spectrum and vehicles broadcast their safety messages to neighboring users. We model the locations of vehicles as a Poisson line Cox point process and the locations of users as a planar Poisson point process. We assume that users are associated with their closest base stations when there is no vehicle within a certain distance $ \rho $. On the other hand, users located within a distance $ \rho $ from vehicles are associated with the vehicles to receive their safety messages. We quantify the properties of this vehicle-prioritized association using the stochastic geometry framework. We derive the fractions of users that receive safety messages from vehicles. Then, we obtain the expression for the signal-to-interference ratio of the typical user evaluated on each association type. To address the impact of vehicular broadcast on the cellular network, the paper also derives the effective rate offered to the typical user in this setting.