Performance and Coexistence Evaluation of IEEE 802.11be Multi-link Operation

TL;DR

This paper evaluates Wi-Fi 7's Multi-Link Operation (MLO) features, comparing two main implementations, and analyzes their performance, coexistence, and effectiveness under various network conditions.

Contribution

It provides a comparative performance analysis of MLMR and MLSR MLO implementations and their coexistence with legacy devices in different network scenarios.

Findings

MLMR performs best in isolated or low-load scenarios.

MLSR reduces latency effectively in medium- to high-load conditions.

MLSR maintains fairness with legacy Single-Link devices.

Abstract

Wi-Fi 7 is already in the making, and Multi-Link Operation (MLO) is one of the main features proposed in its correspondent IEEE 802.11be amendment. MLO will allow devices to coordinate multiple radio interfaces to access separate channels through a single association, aiming for improved throughput, network delay, and overall spectrum reuse efficiency. In this work, we study three reference scenarios to evaluate the performance of the two main MLO implementations -- Multi-Link Multi-Radio (MLMR) and Multi-Link Single-Radio (MLSR) -- , the interplay between multiple nodes employing them, and their coexistence with legacy Single-Link devices. Importantly, our results reveal that the potential of MLMR is mainly unleashed in isolated deployments or under unloaded network conditions. Instead, in medium- to high-load scenarios, MLSR may prove more effective in reducing the latency while guaranteeing fairness with contending Single-Link nodes.