Energy-efficient low power listening for wireless sensor networks in noisy environments.
IPSN 2013: The 12th International Conference on Information Processing in Sensor Networks Philadelphia Pennsylvania USA April, 2013(2013)
摘要
Low Power Listening (LPL) is a common MAC-layer technique for reducing energy consumption in wireless sensor networks, where nodes periodically wakeup to sample the wireless channel to detect activity. However, LPL is highly susceptible to false wakeups caused by environmental noise being detected as activity on the channel, causing nodes to spuriously wakeup in order to receive nonexistent transmissions. In empirical studies in residential environments, we observe that the false wakeup problem can significantly increase a node's duty cycle, compromising the benefit of LPL. We also find that the energy-level threshold used by the Clear Channel Assessment (CCA) mechanism to detect channel activity has a significant impact on the false wakeup rate. We then design AEDP, an adaptive energy detection protocol for LPL, which dynamically adjusts a node's CCA threshold to improve network reliability and duty cycle based on application-specified bounds. Empirical experiments in both controlled tests and real-world environments showed AEDP can effectively mitigate the impact of noise on radio duty cycles, while maintaining satisfactory link reliability.
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关键词
access protocols,energy conservation,radio links,telecommunication network reliability,wireless channels,wireless sensor networks,AEDP,CCA,LPL,MAC layer technique,channel activity detection,clear channel assessment,energy consumption reduction,energy efficient low power listening,energy level threshold,environmental noise,false wakeup rate,link reliability maintenance,node duty cycle,noisy environment,protocol,radio duty cycle,residential environment,wireless channel,wireless sensor network,CCA Control,Low Power Listening,Wireless Sensor Networks,
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