Spatial Reuse and Fairness of Mobile Ad-Hoc Networks With Channel-Aware CSMA Protocols
The authors investigate the benefits of channel-aware (opportunistic) scheduling of transmissions in ad-hoc networks. The key challenge in optimizing the performance of such systems is finding a good compromise among three interdependent quantities: the density and channel quality of scheduled transmitters, and the resulting interference at receivers. They propose two new channel-aware slotted CSMA protocols: Opportunistic CSMA (O-CSMA) and QuanTile-based CSMA (QT-CSMA) and develop stochastic geometric models allowing one to quantify their performance in terms of spatial reuse and spatial fairness. When properly optimized these protocols offer substantial improvements in performance relative to CSMA - particularly when the density of nodes is moderate to high.