INSPIRE: Distributed Bayesian Optimization for ImproviNg SPatIal REuse in Dense WLANs

TL;DR

INSPIRE is a distributed Bayesian optimization approach that enhances spatial reuse in dense WLANs by autonomously tuning transmission parameters, significantly improving fairness and throughput in real-time deployments.

Contribution

This paper introduces INSPIRE, a novel distributed Bayesian optimization method that dynamically adjusts WLAN parameters without assuming network topology, promoting altruistic behavior for overall network performance.

Findings

INSPIRE outperforms existing strategies in simulations.

It rapidly improves WLAN fairness and throughput.

It requires only a few seconds to optimize configurations.

Abstract

WLANs, which have overtaken wired networks to become the primary means of connecting devices to the Internet, are prone to performance issues due to the scarcity of space in the radio spectrum. As a response, IEEE 802.11ax and subsequent amendments aim at increasing the spatial reuse of a radio channel by allowing the dynamic update of two key parameters in wireless transmission: the transmission power (TX_POWER) and the sensitivity threshold (OBSS_PD). In this paper, we present INSPIRE, a distributed solution performing local Bayesian optimizations based on Gaussian processes to improve the spatial reuse in WLANs. INSPIRE makes no explicit assumptions about the topology of WLANs and favors altruistic behaviors of the access points, leading them to find adequate configurations of their TX_POWER and OBSS_PD parameters for the "greater good" of the WLANs. We demonstrate the superiority of INSPIRE over other state-of-the-art strategies using the ns-3 simulator and two examples inspired by real-life deployments of dense WLANs. Our results show that, in only a few seconds, INSPIRE is able to drastically increase the quality of service of operational WLANs by improving their fairness and throughput.