MU EDCA通道接入对IEEE 802.11ax wlan的影响

Sharan Naribole, Wookbong Lee, A. Ranganath
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引用次数: 10

摘要

为了在密集的WLAN部署中实现更高的无线电利用率,IEEE 802.11ax修正案在Wi-Fi标准中引入了正交频分多址(OFDMA)。由于AP (Access Point)通过触发器发起上行链路OFDMA操作,该操作为sta获得介质访问提供了额外的手段。因此,为了保持网络的公平性和减少争用,802.11ax标准中引入了一种新的MU EDCA信道访问模式,为参与上行链路OFDMA操作的sta暂时降低介质访问的优先级。本文在定制的ns-3网络模拟器中实现了802.11ax OFDMA操作的关键组件,并在各种网络和流量条件下评估了MU EDCA信道接入模式对802.11ax密集WLAN性能的影响。我们的研究结果表明:(a)临时切换到MU EDCA通道访问模式在吞吐量和实时应用延迟方面显著提高了网络性能;(b)临时切换到MU EDCA通道访问模式的持续时间对网络性能的影响可以忽略;(c) 200毫秒的MU EDCA通道访问模式可以潜在地支持近2000个sta的密集网络。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Impact of MU EDCA Channel Access on IEEE 802.11ax WLANs
To achieve increased radio utilization in dense WLAN deployments, IEEE 802.11ax amendment introduces Orthogonal Frequency Division Multiple Access (OFDMA) to the Wi-Fi standard. As the Access Point (AP) initiates the uplink OFDMA operation via a trigger, this operation provides an additional means for the STAs to gain medium access. Consequently, to retain fairness in the network and reduce contention, a novel MU EDCA channel access mode has been introduced in 802.11ax standard to temporarily deprioritize medium access for STAs participating in uplink OFDMA operation. In this paper, we implement the key components of 802.11ax OFDMA operation in custom ns-3 network simulator and evaluate the impact of MU EDCA channel access mode on 802.11ax dense WLAN performance under various network and traffic conditions. Our results show that (a) temporarily switching to MU EDCA channel access mode significantly improves network performance in terms of throughput and real-time application latency (b) the duration of temporary switch to MU EDCA channel access mode has negligible impact on network performance and (c) 200 ms of MU EDCA channel access mode can potentially support a dense network of almost 2000 STAs.
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