The contention based medium access method of 802.11 standards is a fundamental cause of poor downlink goodput and high\nlatency over wireless networks, which makes it impossible to provide QoS guarantees. The intensive channel contention leads to\nthe performance degradation.The problem exacerbateswhen the traffic asymmetry between the uplink and the downlink is present.\nWhile prior research works proposed various mechanisms to alleviate the issue, little was done to specifically address the appropriate\nparameter setting in a real world network. This study presents a way to obtain the appropriate access parameters that improves the\nperformance of QoS applications over wireless networks. In particular, we propose AQEDCA, a traffic-aware minimum contention\nwindow adjustment algorithm. We validate our scheme by the extensive real world network tests and the results show that our\nscheme improves the downlink goodput up to 199.13%, decreases the latency up to 54.77%, and can achieve tight QoS guarantees\nas compared to the existing schemes.
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