Abstract
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.
Highlights
In low power wireless sensor networks, sensor nodes are widely deployed in various different environments to collect data
To efficiently compensate for the link quality changes due to temperature variations, in this paper we propose a new scheme for transmission power control that improves energy efficiency while achieving the required reliability
We have presented an empirical study for the effect of temperature on wireless link quality
Summary
In low power wireless sensor networks, sensor nodes are widely deployed in various different environments to collect data. To compensate for temperature variation, temperature compensation devices are included as an enclosure for the AC power These devices can cause a large overhead because sensor nodes operate with batteries. Compared with the maximum transmission power, the controlled transmission power providing a fully connected network is more sensitive to temperature variation It requires a more deliberate control mechanism to maintain link quality and causes inevitable control packet overhead. To efficiently compensate for the link quality changes due to temperature variations, in this paper we propose a new scheme for transmission power control that improves energy efficiency while achieving the required reliability.
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