Measurement and modelling of TCP downstream throughput dependence on SNR in an IEEE802.11b WLAN system

2016 Annual Conference on Information Science and Systems (CISS) Pub Date : 2016-03-16 DOI:10.1109/CISS.2016.7460519

Oghogho Ikponmwosa, F. Edeko, Joy Emagbeter

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引用次数: 6

Abstract

The dependence of TCP downstream throughput (TCPdownT) on signal to noise ratio (SNR) has been studied in this paper. Measurements were taken for multiple users in small offices, open corridors and free space environments using an infrastructure based IEEE 802.11b WLAN while transmitting different quality of service (QoS) traffic. Models able to predict TCPdownT with respect to SNR observed were developed and validated for different signal categories. We observed RMS errors of 0.938012 Mbps, 1.047012 Mbps, 0.65833 Mbps and 0.452927 Mbps for the general (all SNR) model, strong signals model, grey signals model and Weak signals model respectively which were much lower than that of similar models with which they were compared. Comparing our results with previous work on TCP upstream throughput showed that it is more accurate to investigate upstream and downstream throughput separately. Using our models, IEEE 802.11b WLAN installers will be able to predict the TCPdownT by simply measuring and monitoring only the received SNR which is already part of the network installation process.

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IEEE802.11b无线局域网系统中TCP下游吞吐量依赖信噪比的测量和建模

研究了TCP下行吞吐量(TCPdownT)与信噪比(SNR)的关系。在小型办公室、开放式走廊和自由空间环境中，使用基于IEEE 802.11b WLAN的基础设施对多个用户进行了测量，同时传输不同的服务质量(QoS)流量。能够根据观察到的信噪比预测TCPdownT的模型被开发并验证了不同的信号类别。一般(全信噪比)模型、强信号模型、灰色信号模型和弱信号模型的均方根误差分别为0.938012 Mbps、1.047012 Mbps、0.65833 Mbps和0.452927 Mbps，远低于与之比较的同类模型。将我们的研究结果与以往关于TCP上游吞吐量的研究结果进行比较，表明分别研究上游和下游吞吐量更为准确。使用我们的模型，IEEE 802.11b WLAN安装人员将能够通过简单地测量和监控接收到的信噪比来预测TCPdownT，这已经是网络安装过程的一部分。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2016 Annual Conference on Information Science and Systems (CISS)

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