Adaptively scaled back-off (ASB) mechanism for enhanced performance of CSMA/CA in IEEE 802.11ax high efficiency WLAN

NOMS 2018 - 2018 IEEE/IFIP Network Operations and Management Symposium Pub Date : 2018-04-23 DOI:10.1109/NOMS.2018.8406219

N. Shahin, R. Ali, S. Kim, Young-Tak Kim

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引用次数: 8

Abstract

This paper proposes an adaptively scaled back-off (ASB) mechanism to mitigate the performance degradations in the Binary Exponential Back-off (BEB) of IEEE 802.11 CSMA/CA in the highly dense environment such as IEEE 802.11ax high efficiency WLAN (HEW). The proposed ASB mechanism selects the optimal CW size to achieve maximized network performance adaptively based on the measured conditional collision probability (pc) and the estimated number of contending stations. The ASB protocol can provide higher efficiency than the legacy Binary Exponential Back-off (BEB) that simply adjust the back-off contention window (CW) size by blind exponential increase at repeated collision avoidance and resetting to the minimum value (CWmin) at successful transmission. The performance analysis of the proposed ASB scheme with ns-3 network simulation shows that the proposed ASB scheme can achieve 21.14% higher throughput and take 32.45% less average interval between successful transmissions than the BEB mechanism in highly dense WLANs with saturated traffic environment.1

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在IEEE 802.11ax高效无线局域网中增强CSMA/CA性能的自适应缩放后退(ASB)机制

针对ieee802.11 CSMA/CA在高密度环境(如ieee802.11 ax高效WLAN (HEW))下二进制指数回退(BEB)的性能下降问题，提出了一种自适应缩放回退(ASB)机制。提出的ASB机制基于实测的条件碰撞概率(pc)和估计的竞争站数，自适应地选择最优的CW大小，以实现最大的网络性能。与传统的二进制指数回退(BEB)协议相比，ASB协议可以提供更高的效率。传统的二进制指数回退(BEB)协议在重复避免碰撞时通过盲目指数增加来调整回退争夺窗口(CW)的大小，在成功传输时重置为最小值(CWmin)。通过ns-3网络仿真对所提出的ASB方案进行性能分析，结果表明，在饱和流量环境下的高密度无线局域网中，所提出的ASB方案比BEB机制的吞吐量提高21.14%，平均成功传输间隔缩短32.45%

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NOMS 2018 - 2018 IEEE/IFIP Network Operations and Management Symposium

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