Fault tolerance of cluster-based nodes in IoT sensor networks with periodic mode of operation

Abstract In various applications of the Internet of Things, one of the basic elements of architecture is wireless networks in the nodes of which sensors are located to collect heterogeneous information, determined by the type of application. One of the ways to extend the duration of uninterrupted network operation is to combine sensors into clusters. Many sensors in wireless sensor networks (WSNs) operate in periodic mode, alternating communication sessions with periods of operation waiting. Sensors usually have autonomous power supply from accumulators or batteries, which is one of the critical factors in the life cycle of a network and requires additional attention from the point of view of its fault tolerance. Different methods for increasing dependability of sensors with periodic mode of operation in cluster-based WSNs using different test strategies and methods of batteries redundancy are analyzed in the chapter. The Markov models for study of sensor node fault tolerance with proposed methods are developed. Expressions for the availability of sensors in the described network and for the fault tolerance effect of network operation are obtained.