Ensemble based sensing anomaly detection in wireless sensor networks

Authors:
Daniel-Ioan Curiac;Constantin Volosencu
Affiliations:
Automation and Applied Informatics Department, "Politehnica" University of Timisoara, Bd. V. Parvan nr. 2, 300223 Timisoara, Romania;Automation and Applied Informatics Department, "Politehnica" University of Timisoara, Bd. V. Parvan nr. 2, 300223 Timisoara, Romania
Venue:
Expert Systems with Applications: An International Journal
Year:
2012

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Abstract

Wireless sensor networks are often used to monitor and measure physical characteristics from remote and sometimes hostile environments. In these circumstances the sensing data accuracy is a crucial attribute for the way these applications complete their objectives, requiring efficient solutions to discover sensor anomalies. Such solutions are hard to be found mainly because the intricate defining of the correct sensor behavior in a complex and dynamic environment. This paper tackles the sensing anomaly detection from a new perspective by modeling the correct operation of sensors not by one, but by five different dynamical models, acting synergically to provide a reliable solution. Our methodology relies on an ensemble based system composed of a set of diverse binary classifiers, adequately selected, to implement a complex decisional system on network base station. Moreover, every time a sensing anomaly is discovered, our ensemble offers a reliable estimation to replace the erroneous measurement provided by sensor.