The decreasing cost of sensors is resulting in an increase in the use of wireless sensor networks for structural health monitoring. In most applications, nodes are deployed once and are supposed to operate unattended for a long period of time. Due to the deployment of a large number of sensor nodes, it is not uncommon for sensor nodes to become faulty and unreliable. Faults may arise from hardware or software failure. Software failure causes non-deterministic behavior of the node, thus resulting in the acquisition of inaccurate data. Consequently, there exists a need to modify the system software and correct the faults in a wireless sensor node (WSN) network. Once the nodes are deployed, it is impractical at best to reach each individual node. Moreover, it is highly cumbersome to detach the sensor node and attach data transfer cables for software updates. Over-the-air programming is a fundamental service that serves this purpose. This paper discusses maintenance issues related to software for sensor nodes deployed for monitoring structural health and provides a comparison of various protocols developed for reprogramming.
Comments: 28 Pages.
[v1] 2014-05-07 01:31:32
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