Beamforming Techniques for Enabling Spatial-Reuse in MCCA 802.11s Networks
The authors address the problem of Co-Channel Interference (CCI) in wireless mesh networks based on the IEEE802.11s extension. The carrier sensing mechanism deployed in those networks insufficiently addresses the CCI problem, causing the hidden and exposed node problems; consequently degrading the throughput and latency. In this paper, they show how beamforming techniques can be implemented on top of the IEEE802.11s medium access control protocol and using the information readily available, cancel the interference to mitigate this inefficiency of carrier sense and improve the spatial-reuse gain. In addition, they propose the Signal-to-Jamming-Noise Ratio (SJNR) beamformer and show that it significantly improves the spatial-reuse gain compared to the simple Zero-Forcing (ZF) beamformer and the basic IEEE802.11s access scheme.