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The Spatial Reuse (SR) operation included in the IEEE 802.11ax-2020 (11ax)amendment aims at increasing the number of parallel transmissions in anOverlapping Basic Service Set (OBSS). However, many unknowns exist about theperformance gains that can be achieved through SR. In this paper, we provide abrief introduction to the SR operation described in the IEEE 802.11ax (draftD4.0). Then, a simulation-based implementation is provided in order to explorethe performance gains of the SR operation. Our results show the potential ofusing SR in different scenarios covering multiple network densities and trafficloads. In particular, we observe significant improvements on the channelutilization when applying SR with respect to the default configuration, thusallowing to increase the throughput and reduce the delay. Interestingly, thehighest improvements provided by the SR operation are observed in the mostpessimistic situations in terms of network density and traffic load.

On the Performance of the Spatial Reuse Operation in IEEE 802.11ax WLANs