Combined Spatial Division Multiplexing and Spatial Reuse across Decentral Wireless LANs

The upcoming IEEE 802.11ax standard introduces spatial reuse and enhanced spatial division multiplexing as two measures to improve user throughput by parallel transmitting links and spatial streams. Related work shows that the proposed spatial reuse concept does not fully utilize the spatial reuse potential. The standard limits spatial division multiplexing to one network. This paper investigates a spatial division multiplexing concept across multiple, decentrally organized networks to cancel co-channel interference. The paper combines the concept with an improved version of spatial reuse and introduces a corresponding channel access protocol, CSMA/SDMSR. An IEEE 802.11ax based simulation of reference scenarios demonstrates a CSMA/SDMSR system performance improvement up to 108 % and decreased latency compared to standard CSMA/CA.