Abstract
To improve the performance of Wi-Fi networks in dense deployments, the recent IEEE 802.11ax standard introduces a palette of features improving spatial reuse. A key property of these features is dynamic changes in transmit power and the interference from the neighboring devices. The paper explains the basic operation of spatial reuse features and shows that their efficiency significantly depends on how the stations select appropriate modulation and coding schemes taking into account the variable transmission conditions. Nevertheless, the majority of existing studies in the literature leave this effect out of consideration, assuming an ideal rate control algorithm and obtaining wrong results. The paper fills this gap and presents a novel statistics-based rate control algorithm that selects modulation and coding schemes taking into account the effects induced by the recent spatial reuse features. With extensive simulation, it is shown that the algorithm significantly outperforms the existing rate control algorithms, providing up to 50% higher goodput and three times lower latencies.
Highlights
Nowadays, Wi-Fi networks are densely deployed in offices, malls, airports, multi-apartment buildings
As for the frequency of OBSS_PD changes, the STA can adjust the OBSS_PD value every time an inter-BSS transmission starts. Such frequent changes in OBSS_PD, and transmit power and interference complicate MCS selection, as we show in the paper
The existing study of spatial reuse algorithms either do not consider the ability of the Wi-Fi devices to adaptively select an appropriate MCS or consider an ideal behavior. We believe that such oversimplification of Wi-Fi operation is done because the rate control algorithms widely used in the previous versions of Wi-Fi work wrong when combined with the OBSS PD mechanism
Summary
Wi-Fi networks are densely deployed in offices, malls, airports, multi-apartment buildings. As for the frequency of OBSS_PD changes, the STA can adjust the OBSS_PD value every time an inter-BSS transmission starts Such frequent changes in OBSS_PD, and transmit power and interference complicate MCS selection (or, as it is often called in the papers on Wi-Fi, rate control), as we show in the paper. The existing study of spatial reuse algorithms either do not consider the ability of the Wi-Fi devices to adaptively select an appropriate MCS or consider an ideal behavior We believe that such oversimplification of Wi-Fi operation is done because the rate control algorithms widely used in the previous versions of Wi-Fi work wrong when combined with the OBSS PD mechanism. Having the distribution, we select the optimal MCS using the Thompson sampling approach described above
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