Optimized Non-Primary Channel Access Design in IEEE 802.11bn

TL;DR

This paper analyzes the inefficiencies of the Non-Primary Channel Access protocol in Wi-Fi 7, develops an analytical model to evaluate throughput, and proposes a hybrid model that outperforms existing approaches across various channel conditions.

Contribution

It introduces an analytical throughput model for NPCA, highlights the impact of protocol overhead, and proposes a hybrid model that improves channel utilization in Wi-Fi 7 networks.

Findings

NPCA overhead significantly affects throughput.

The hybrid model outperforms traditional models.

The study provides a comprehensive analytical framework.

Abstract

The IEEE 802.11 standards, culminating in IEEE 802.11be (Wi-Fi 7), have significantly expanded bandwidth capacities from 20 MHz to 320 MHz, marking a crucial evolution in wireless access technology. Despite these advancements, the full potential of these capacities remains largely untapped due to inefficiencies in channel management, in particular, the underutilization of secondary (non-primary) channels when the primary channel is occupied. This paper delves into the Non-Primary Channel Access (NPCA) protocol, initially proposed by the IEEE 802.11 Ultra-High Reliability (UHR) group, aimed at addressing these inefficiencies. Our research not only proposes an analytical model to assess the throughput of NPCA in terms of average throughput but also crucially identifies that the overhead associated with the NPCA protocol is significant and cannot be ignored. This overhead often undermines the effectiveness of the NPCA, challenging the assumption that it is invariably superior to traditional models. Based on these findings, we have developed and simulated a new hybrid model that dynamically integrates the strengths of both legacy and NPCA models. This model overall outperforms the existing models under all channel occupancy conditions, offering a robust solution to enhance throughput efficiency.