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Sensors 2010, 10(3), 2332-2347; doi:10.3390/s100302332

An Adaptive Fault-Tolerant Event Detection Scheme for Wireless Sensor Networks

Department of Computer Engineering, Hongik University, 72-1 Sangsu-Dong, Mapo-Gu, Seoul, Korea
* Author to whom correspondence should be addressed.
Received: 20 January 2010 / Revised: 25 February 2010 / Accepted: 10 March 2010 / Published: 19 March 2010
(This article belongs to the Section Chemical Sensors)
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In this paper, we present an adaptive fault-tolerant event detection scheme for wireless sensor networks. Each sensor node detects an event locally in a distributed manner by using the sensor readings of its neighboring nodes. Confidence levels of sensor nodes are used to dynamically adjust the threshold for decision making, resulting in consistent performance even with increasing number of faulty nodes. In addition, the scheme employs a moving average filter to tolerate most transient faults in sensor readings, reducing the effective fault probability. Only three bits of data are exchanged to reduce the communication overhead in detecting events. Simulation results show that event detection accuracy and false alarm rate are kept very high and low, respectively, even in the case where 50% of the sensor nodes are faulty.
Keywords: sensor networks; fault tolerance; event detection; adaptive sensor networks; fault tolerance; event detection; adaptive
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Yim, S.-J.; Choi, Y.-H. An Adaptive Fault-Tolerant Event Detection Scheme for Wireless Sensor Networks. Sensors 2010, 10, 2332-2347.

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