Abstract
As density of a wireless LAN grows, per-user throughput degrades severely, deteriorating user experience. To improve service quality, it is important to increase system spectral efficiency. Controlling carrier-sense threshold is one of the key techniques to achieve the goal, because frequently transmissions are unnecessarily blocked by carrier sensing, even though these transmissions can take place without causing packet losses. Using high carrier-sense threshold and allowing nodes to transmit aggressively may increase the system throughput, but this approach can lead to unfair channel share and cause starvation for the edge nodes. In this paper, we propose a medium access control protocol where transmitters include the carrier-sense threshold required to protect its packet in the preamble. Nodes receiving the preamble only transmit concurrently, when they are confident that their own transmission as well as the on-going transmission will both be successfully received at the respective receivers. The simulation results show that this dual-threshold approach can achieve higher system throughput compared to using a single carrier-sense threshold, without penalizing edge nodes.
Highlights
IEEE 802.11-based wireless local area networks (WLANs) are widely deployed in indoor environments, providing convenient Internet connection to users
The model-based chooses the advertised carrier-sense threshold (CST) by assuming that an interfering node exists at the farthest position from the node, which is a conservative approach
We have proposed a medium access control protocol for wireless LANs where carrier-sense thresholds are dynamically selected to improve spatial reuse
Summary
IEEE 802.11-based wireless local area networks (WLANs) are widely deployed in indoor environments, providing convenient Internet connection to users. The recent trend is its densification: number of access points (APs), number of mobile devices, and amount of traffic are all rapidly increasing. It is easy to find tens of APs in the vicinity of a user. The system spectral efficiency becomes a significant issue. It is important to maximize user throughput in a given space where many users are sharing channel resource. Spatial reuse (SR) must be improved: more users should be able to concurrently send packets in a given area. The problem is that concurrent transmissions could result in a packet loss, because one signal becomes interference to another signal which degrades
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