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Wireless Sensor Networks (WSNs) are envisioned as densely deployed tiny sensors, left unattended to monitor and interact with physical and environmental phenomena. Faults and failures are inevitable in WSNs due to the inhospitable environment and unattended deployment. In this paper, the authors survey fault management in WSNs, and review and categorize current approaches and techniques dealing with faults and failure in WSNs at different levels. The categorization is based on the different phases of fault management, i.e. fault detection, fault diagnosis and fault recovery. Based on the literature survey, they elaborate different issues and problems in existing approaches for fault management. They attest that most of these approaches are application specific and address faults only at a certain level.
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