The Effect of Multiple Access Categories on the MAC Layer Performance of IEEE 802.11p

The enhanced distributed channel access (EDCA) mechanism enables IEEE 802.11p to accommodate differential quality of service (QoS) levels in vehicle-to-vehicle (V2V) communications, through four access categories (ACs). This paper presents multi-dimensional discrete-time Markov chain (DTMC) based model to study the effect of parallel operation of the ACs on the medium access control (MAC) layer performance of ITS-G5 IEEE 802.11p. The overall model consists of four queue models with their respective traffic generators, which are appropriately linked with the DTMCs modeling the operation of each AC. Closed-form solutions for the steady-state probabilities of the models are obtained, which are then utilized to derive expressions for key performance indicators at the MAC layer. An application for a highway scenario is presented to draw insights on the performance. The results show how the performance measures vary among ACs according to their priority levels, and emphasize the importance of analytical modeling of the parallel operation of all four ACs.

Authors:
Wijesiri Geeth P., Haapola Jussi, Samarasinghe Tharaka

Publication type:
A4 Article in conference proceedings

Place of publication:
GLOBECOM 2020 – 2020 IEEE Global Communications Conference

Keywords:
Access categories, discrete-time Markov chain, ETSI ITS-G5, IEEE-802.11p, medium access control, vehicle-to-vehicle communication

Published:
15 February 2021

Full citation:
G. P. Wijesiri, J. Haapola and T. Samarasinghe, “The Effect of Multiple Access Categories on the MAC Layer Performance of IEEE 802.11p,” GLOBECOM 2020 – 2020 IEEE Global Communications Conference, Taipei, Taiwan, 2020, pp. 1-6, doi: 10.1109/GLOBECOM42002.2020.9348088

DOI:
https://doi.org/10.1109/GLOBECOM42002.2020.9348088

Read the publication here:
http://urn.fi/urn:nbn:fi-fe202102175149