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The authors develop analytical models for estimating the energy spent by Stations (STAs) in infrastructure WLANs when performing TCP controlled file downloads. The authors 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). The approach is to develop accurate models for obtaining the fraction of times the STA radios spend in idling, receiving and transmitting. The authors discuss two traffic models for each mode of operation: Each STA performs one large file download, and the STAs perform short file transfers. The authors evaluate the rate of STA energy expenditure with long file downloads, and show that static PSM is worse than just using CAM.
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