Throughput Analysis of IEEE 802.11bn Coordinated Spatial Reuse

TL;DR

This paper develops an analytical model to evaluate the throughput and spatial efficiency of Coordinated Spatial Reuse in Wi-Fi 8, demonstrating significant throughput gains over legacy and previous standards.

Contribution

It introduces a CTMC-based analytical model for C-SR, providing insights into its performance and benefits in various network topologies.

Findings

C-SR enables parallel high-quality transmissions.

Up to 59% throughput gain over legacy 802.11 DCF.

Up to 42% throughput gain over 802.11ax OBSS/PD.

Abstract

Multi-Access Point Coordination (MAPC) is becoming the cornerstone of the IEEE 802.11bn amendment, alias Wi-Fi 8. Among the MAPC features, Coordinated Spatial Reuse (C-SR) stands as one of the most appealing due to its capability to orchestrate simultaneous access point transmissions at a low implementation complexity. In this paper, we contribute to the understanding of C-SR by introducing an analytical model based on Continuous Time Markov Chains (CTMCs) to characterize its throughput and spatial efficiency. Applying the proposed model to several network topologies, we show that C-SR opportunistically enables parallel high-quality transmissions and yields an average throughput gain of up to 59% in comparison to the legacy 802.11 Distributed Coordination Function (DCF) and up to 42% when compared to the 802.11ax Overlapping Basic Service Set Packet Detect (OBSS/PD) mechanism.