  In this article, we evaluate the performance of the parameterized spatial
reuse (PSR) framework of IEEE 802.11ax, mainly focusing on its impact on
transmission latency. Based on detailed standard-compliant system-level
simulations, we provide a realistic analysis of the effects of PSR considering
different scenario densities, traffic loads, and access points (APs) antenna
capabilities to quantify its performance gains under various scenarios. Our
results show that, in medium-density scenarios, PSR can offer up to a 3.8x
reduction in the 5% worst-case latencies for delay-sensitive stations with
respect to an 802.11ax system without PSR. Moreover, our study demonstrates
that, for low-latency communications, providing the network with PSR
capabilities may be an appealing alternative to the deployment of more costly
multi-antenna APs.
