Abstract
Institute of Electrical and Electronics Engineers (IEEE) 802.11ax Spatial Reuse (SR) is a new feature in the IEEE 802.11 family, aiming at improving the spectrum efficiency and the network performance in dense deployments. The main and perhaps the only SR technique in that amendment is the Basic Service Set (BSS) Color. It aims at increasing the number of concurrent transmissions in a specific area, based on a newly defined Overlapping BSS/Preamble-Detection threshold. In this paper, we overview the latest developments introduced in the IEEE 802.11ax for the SR and propose a rate control algorithm developed to exploit the BSS Color scheme. Our proposed algorithm, Damysus is specifically designed to function in dense environments where other off-the-shelf algorithms show poor performance. Simulation results in various dense scenarios, show a clear performance improvement of up to 113% gain in throughput over the well known MinstrelHT algorithm.
Highlights
During the last two decades, Wireless Local Area Networks (WLANs) have been evolving to satisfy the traffic demands, the new use cases, and the user requirements [1]
In contrast to its predecessors aiming at enhancing link throughput, Institute of Electrical and Electronics Engineers (IEEE) 802.11ax focuses on improving the spectrum efficiency and the area throughput in dense WLANs, whilst reducing power consumption for portable devices [3]
We focus on the Overlapping Basic Service Sets (OBSSs)/PD-based operation, which may function in a distributed way and does not require the exchange of control frames
Summary
During the last two decades, Wireless Local Area Networks (WLANs) have been evolving to satisfy the traffic demands, the new use cases, and the user requirements [1]. Tuning the Clear Channel Assessment (CCA) threshold or the transmit power level has implications on the network performance and may lead to poor performance due to the increased number of hidden or exposed nodes [6] Another IEEE standardized (though optional) feature that was proposed to ameliorate hidden/exposed node problem is the four-way Request-to-Send/Clear-to-Send (RTS/CTS) handshake that leans on the exchange of control frames prior to a data transmission. TPC is selfless, meaning that nodes that applying TPC will not benefit from it [may experience low Signal-to-Interference-plus-Noise ratio (SINR)], but the neighbouring nodes that do not use it (transmit at the maximum power level), will directly be at an advantage [13] This is the main reason that TPC is not widely used in the networks and it is only applied on Access Points (APs) with wireless controllers. A new feature that has been adopted from the IEEE 802.11ah [24], and is currently included in the IEEE
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