Analytical models for energy consumption in infrastructure WLAN STAs carrying TCP traffic

Pranav Agrawal, Anurag Kumar, J. Kuri, M. Panda, Vishnu Navda, R. Ramjee, V. Padmanabhan
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引用次数: 28

Abstract

We develop analytical models for estimating the energy spent by stations (STAs) in infrastructure WLANs when performing TCP controlled file downloads. We focus on the energy spent in radio communication when the STAs are in the Continuously Active Mode (CAM), or in the static Power Save Mode (PSM). Our approach is to develop accurate models for obtaining the fraction of times the STA radios spend in idling, receiving and transmitting. We discuss two traffic models for each mode of operation: (i) each STA performs one large file download, and (ii) the STAs perform short file transfers. We evaluate the rate of STA energy expenditure with long file downloads, and show that static PSM is worse than just using CAM. For short file downloads we compute the number of file downloads that can be completed with given battery capacity, and show that PSM performs better than CAM for this case. We provide a validation of our analytical models using the NS-2 simulator.
承载TCP流量的基础设施WLAN sta能耗分析模型
我们开发了分析模型,用于估计基础设施wlan中站点(sta)在执行TCP控制的文件下载时所消耗的能量。我们重点研究了当sta处于持续活动模式(CAM)或静态省电模式(PSM)时,在无线电通信中消耗的能量。我们的方法是开发精确的模型,以获得STA无线电在空转、接收和发射中花费的时间比例。我们讨论了每种操作模式的两种流量模型:(i)每个STA执行一次大文件下载,(ii) STA执行短文件传输。我们评估了长文件下载时STA能量消耗的比率,并表明静态PSM比仅使用CAM更糟糕。对于短文件下载,我们计算了给定电池容量下可以完成的文件下载数量,并表明在这种情况下,PSM的性能优于CAM。我们使用NS-2模拟器验证了我们的分析模型。
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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