HARQ Retransmissions in C-V2X: A BSM Latency Analysis

Abdurrahman Fouda, Randall Berry, Ivan Vukovic

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Cellular vehicular-to-everything (C-V2X) systems offer the potential for improving road safety, in part through the exchange of periodic basic safety messages (BSMs) between nearby vehicles. The reliability and latency of these messages is a key metric. Hybrid automatic repeat request (HARQ) retransmissions are one technique used to this end. However, HARQ may come at the expense of consuming the limited available wireless resources, especially in highly congested scenarios. This paper studies BSM transmission latency and reliability when HARQ retransmissions are used with the semi-persistent scheduling (SPS) in C-V2X transmission mode 4. We do so through extensive system-level simulations that closely follow the SPS process. Furthermore, we provide an analytical model for the tail behavior of the BSM latency distribution with HARQ retransmissions that is a good approximation to the simulation results. Our study reveals the impact of several deployment settings (e.g., bandwidth configurations and vehicle density).

Original languageEnglish (US)
Title of host publicationICC 2024 - IEEE International Conference on Communications
EditorsMatthew Valenti, David Reed, Melissa Torres
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages4317-4322
Number of pages6
ISBN (Electronic)9781728190549
DOIs
StatePublished - 2024
Externally publishedYes
Event59th Annual IEEE International Conference on Communications, ICC 2024 - Denver, United States
Duration: Jun 9 2024Jun 13 2024

Publication series

NameIEEE International Conference on Communications
ISSN (Print)1550-3607

Conference

Conference59th Annual IEEE International Conference on Communications, ICC 2024
Country/TerritoryUnited States
CityDenver
Period6/9/246/13/24

Funding

This project was supported in part by the Ford-Northwestern University Alliance.

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering

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