Real-time applications (RTAs) require low delays and impose a significant challenge to Wi-Fi. In Wi-Fi, high delays are often caused by waiting for the channel to become idle. This problem can be solved with Parameterized Spatial Reuse (PSR), which allows a station (STA) to transmit its frame with reduced power simultaneously with a triggered uplink transmission in an overlapping network. The PSR opportunity depends on the pathloss between involved STAs, so the same transmission may allow PSR for one STA but not for another one. Thus, to satisfy tight delay constraints in dense overlapping networks, access points (APs) in the same area shall often allow PSR for every STA with RTA traffic. This letter proposes a fast scheduler enabling frequent PSR transmissions for RTA traffic. The scheduler uses Multi-AP coordination, the feature of upcoming Wi-Fi 8. With simulations, we show that it almost halves the delay for RTA traffic and does not deteriorate the quality of service for other traffic compared with an airtime fairness scheduler.

翻译：实时应用对低延迟的要求给Wi-Fi带来了重大挑战。在Wi-Fi中，高延迟通常由等待信道空闲引起。这一问题可通过参数化空间复用解决，该技术允许站点在重叠网络中，以降低的功率与一个被触发的上行链路传输同时发送其帧。PSR机会取决于相关站点之间的路径损耗，因此同一传输可能允许一个站点进行PSR，而对另一个站点则不允许。因此，为满足密集重叠网络中的严格延迟约束，同一区域内的接入点应经常为所有承载实时业务流量的站点启用PSR。本文提出一种快速调度器，能够为实时业务流量实现频繁的PSR传输。该调度器利用了即将到来的Wi-Fi 8标准中的多接入点协调特性。通过仿真，我们证明与空时公平调度器相比，该调度器几乎将实时业务流量的延迟减半，且不会降低其他业务的服务质量。