Dynamically Tuning Aggression Levels for Capacity-Region-Aware Medium Access Control in Wireless Networks

PCS Threshold Selection for Spatial Reuse in High Density CSMA/CA MIMO Wireless Networks

“…For new generations of WiFi clients, PCS threshold adaptation that maintains minimum required SINR could improve performance in high density WLANs [6]. Recent research into improving the performance of large-scale CSMA networks includes new channel access algorithms [7], CSMA-based protocol designs [8], [14]- [16], dynamic tuning of the PCS threshold [3], [4], [17]- [26] and optimization of the PCS threshold to maximize performance [5], [12], [27]- [29]. Using Basic Service Set (BSS) coloring information and considering minimum SINR level in [7], an algorithm is proposed to dynamically adjust transmit power and channel access rules in WLANs.…”

“…The enhanced LBT schemes incorporate PCS threshold adaptation to avoid interference and increase channel access opportunity. An adaptive channel access scheme is proposed in [16] that exploits the information-theoretic capacity region of a multiple access channel. Exploiting the capacity region to determine the channel access strategy of a node, appears similar to opportunistic CSMA [8], [15] where nodes with good channels are allowed to contest for channel access while neglecting to properly choose the PCS threshold, which determines spatial reuse.…”

“…Adapting the PCS threshold based on this measured network information is further complicated by the CSMA/CA protocol, especially in high-density networks and may not guarantee optimality. The enhanced CSMA protocols proposed and analyzed so far [8], [15], [16] require knowledge of the optimal PCS threshold to guarantee optimal spatial reuse but do not propose methods for PCS threshold optimization. Finally, the PCS threshold should be optimized to prevent the hidden terminal and the exposed terminal problems inherent in the CSMA/CA protocol [1], [5], which are not addressed by the existing schemes [4], [8]- [34].…”