Abstract
Wi-Fi 8 (IEEE 802.11bn) targets Ultra-High Reliability (UHR) by introducing a key technology - Coordinated Spatial Reuse (CoSR) passed in the TGbn motion list. In dense networks with many access points (APs), CoSR is envisioned to enable simultaneous Downlink (DL) transmissions for multiple APs. Hence, compared to the pre-UHR SR technology, CoSR is able to achieve reduction in frame deliver delay and increased throughput as a result of concurrent multi-AP DL transmission with moderately increased overhead. However, the optimization for CoSR is under-investigated for intelligent power control and network topology in terms of minimizing the interference and maximizing the network throughput in overlapping basic service set (OBSS). To this end, this paper firstly formulates a network throughput maximization problem to optimize the transmit power, constrained by network topology formed by following IEEE 802.11 DCF method. This problem is solved by the proposed block coordinate descent (BCD) with the corresponding improvised W-MMSE method that is of an optimized time complexity. The proposed methods are evaluated using a link-level simulator against the standard SR method and CoSR with maximum transmit power in terms of the network throughput, Jain's index, time complexity, and the average number of active APs. The results demonstrates that the proposed CoSR outperforms the SR baseline by up to 63.64% in terms of network throughput.