Department of Communication Engineering, Kwangwoon University, 447-1 Wolgye-Dong, Nowon-Ku, Seoul 139-701, Korea.
Sensors (Basel). 2011;11(3):3078-93. doi: 10.3390/s110303078. Epub 2011 Mar 10.
Wireless sensor networks collect data from several nodes dispersed at remote sites. Sensor nodes can be installed in harsh environments such as deserts, cities, and indoors, where the link quality changes considerably over time. Particularly, changes in transmission power may be caused by temperature, humidity, and other factors. In order to compensate for link quality changes, existing schemes detect the link quality changes between nodes and control transmission power through a series of feedback processes, but these approaches can cause heavy overhead with the additional control packets needed. In this paper, the change of the link quality according to temperature is examined through empirical experimentation. A new power control scheme combining both temperature-aware link quality compensation and a closed-loop feedback process to adapt to link quality changes is proposed. We prove that the proposed scheme effectively adapts the transmission power to the changing link quality with less control overhead and energy consumption.
无线传感器网络从分散在远程站点的多个节点收集数据。传感器节点可以安装在恶劣的环境中，如沙漠、城市和室内，其中链路质量随时间有很大的变化。特别是，传输功率的变化可能是由温度、湿度和其他因素引起的。为了补偿链路质量的变化，现有方案通过一系列反馈过程检测节点之间的链路质量变化，并控制传输功率，但这些方法可能会导致由于需要额外的控制数据包而导致开销过大。本文通过经验实验研究了温度对链路质量的影响。提出了一种新的功率控制方案，结合温度感知链路质量补偿和闭环反馈过程来适应链路质量的变化。我们证明，所提出的方案可以有效地适应传输功率的变化，具有较小的控制开销和能量消耗。
