In wireless sensor networks, sensor nodes fail either when some critical event occurs at the node or when the battery of the nodes is completely drained. If the remaining nodes in the sensor network are not aware of the node failure, the network might under undergo significant broadcast delay and path loss. An alarm packet has to be broadcast throughout the network when any critical event occurs and the transmission path must be recovered to achieve better quality of service in the sensor

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... in the sensor network. This paper utilizes least disruptive topology repair (LeDir) algorithm to minimize the power consumption and to handle such critical events. LeDir algorithm is used to recover the transmission path and to ensure that the quality of service issues in the network is met. The variations in the throughput, roundtrip time, broadcast delays and packet delivery ratio of the network are observed by performing multiple NS-2 simulations. It is observed that the throughput of the network could be quickly regained when the transmission path is recovered by node replacement.