Resilient event detection in wireless sensor networks

As wireless sensor networks become widely used, the need to provide fault-tolerant, user-friendly middleware for detecting sensed events increases. Our contribution is the motivation, design, implementation and evaluation of Res TAG, which provides fault-tolerant aggregate queries in the popular, user-friendly TinyDB middleware. If a sensor becomes mis-calibrated or physically compromised, the fault-tolerant queries use the network redundancy to reduce the confidence in any report from that sensor. Queries implemented using Res TAG detect faulty nodes within a predictable threshold that depends on both the percentage and failure type of faulty nodes.