Performance Enhancement of C-V2X Mode 4 Utilizing Multiple Candidate Single-subframe Resources

TL;DR

This paper proposes a method to allocate multiple candidate single-subframe resources in C-V2X Mode 4, reducing delays for low priority data streams with minimal impact on packet collisions.

Contribution

It introduces a novel resource allocation scheme that dynamically assigns multiple CSRs per vehicle based on vehicle count, improving delay performance.

Findings

Significant delay reduction for low priority streams

Minimal increase in packet collisions

Effective resource allocation strategy

Abstract

Prioritization of data streams in cellular vehicle-to-everything (C-V2X) may lead to unfavorable packet delays in low priority streams. This paper studies the allocation of multiple candidate single-subframe resources (CSRs) per vehicle as a solution. It proposes a methodology to determine the number of CSRs for each vehicle based on the number of total vehicles, and to assign the multiple data streams among them for simultaneous transmission. The numerical results highlight the achievable delay gains of the proposed approach, and its negligible impact on packet collisions.