A Study of the Impact of the Contention Window on the Performance of IEEE 802.11bd Networks with Channel Bonding

TL;DR

This paper compares channel bonding techniques in IEEE 802.11bd V2X networks through simulation, revealing that legacy techniques outperform new bonding methods in delay and packet loss, and identifies an optimal contention window size.

Contribution

It provides a comparative analysis of channel bonding techniques in IEEE 802.11bd, highlighting the superiority of legacy methods and proposing an optimal contention window size.

Findings

Legacy channel bonding yields better QoS in delays and packet loss.

New bonding techniques do not outperform legacy in studied scenarios.

A quasi-optimal contention window size is identified for legacy bonding.

Abstract

Nowadays, Vehicle-To-Everything (V2X) networks are actively developing. Most of the already deployed V2X networks are based on the IEEE 802.11p standard. However, these networks can provide only basic V2X applications and will unlikely fulfill stringent requirements of modern V2X applications. Thus, the IEEE has launched a new IEEE 802.11bd standard. A significant novelty of this standard is channel bonding. IEEE 802.11bd describes two channel bonding techniques, which differ from the legacy one used in modern Wi-Fi networks. Our study performs a comparative analysis of the various channel bonding techniques and a single-channel access method from IEEE 802.11p via simulation. We compare them under different contention window sizes and demonstrate that the legacy technique provides the best quality of service in terms of frame transmission delays and packet loss ratio. Moreover, we have found a quasi-optimal contention window size for the legacy technique.