承载TCP业务的基础设施WLAN STA的能耗分析模型
Analytical Models for Energy Consumption in Infrastructure WLAN STAs Carrying TCP Traffic
摘要：
我们开发的分析模型，估计能源消耗的站（STA）在基础设施无线局域网时，执行TCP控制的文件下载。我们关注STA处于连续活动模式（CAM）或静态省电模式（PSM）时无线电通信中消耗的能量。我们的方法是开发精确的模型，用于获得STA无线电在空闲，接收和发送中花费的时间的分数。我们讨论用于每种操作模式的两种业务模型：（i）每个STA执行一个大文件下载，以及（ii）STA执行短文件传输。我们评估了STA的能量消耗率与长文件下载，并表明静态PSM是更糟糕的，只是使用CAM。对于短的文件下载，我们计算的文件下载的数量，可以完成与给定的电池容量，并显示，PSM性能优于CAM在这种情况下。我们提供了一个验证我们的分析模型，使用NS-2模拟器。与早期的PSM分析建模工作相比，我们的模型捕获了PSM中802.11 MAC与TCP某些方面之间交互的细节。
英文摘要：
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. In contrast to earlier work on analytical modeling of PSM, our models that capture the details of the interactions between the 802.11 MAC in PSM and certain aspects of TCP.
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