A contention window adjustment algorithm for improving fairness between uplink and downlink in IEEE 802.11 WLANs

WS Lim, DW Kim, YJ Suh, DH Kwon - The Journal of Korean …, 2011 - koreascience.kr
WS Lim, DW Kim, YJ Suh, DH Kwon
The Journal of Korean Institute of Communications and Information Sciences, 2011koreascience.kr
This paper addresses the fairness issue between uplink and downlink traffic in IEEE 802.11
WLANs. Some solutions in existing work try to solve this issue by giving smaller minimum
contention window (CWmin) value to an AP compared to stations. In contrast to the existing
solutions, a proposed algorithm in this paper aims at finding CWmin values that not only
provides fairness between uplink and downlink traffic among stations but also achieves high
throughput. For this, in the proposed algorithm, an AP checks the number of stations that …
Abstract
This paper addresses the fairness issue between uplink and downlink traffic in IEEE 802.11 WLANs. Some solutions in existing work try to solve this issue by giving smaller minimum contention window (CWmin) value to an AP compared to stations. In contrast to the existing solutions, a proposed algorithm in this paper aims at finding CWmin values that not only provides fairness between uplink and downlink traffic among stations but also achieves high throughput. For this, in the proposed algorithm, an AP checks the number of stations that have uplink and downlink traffic, respectively. Based on this information, the AP calculates optimal CWmin values and announces it to stations. Our simulation results show that the proposed algorithm outperforms existing algorithms in terms of fairness and throughput.
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