International Journal of Engineering Sciences & Research Technology (IJESRT)
In this paper, the authors proposed to monitor a critical event in wireless sensor networks. Whenever a critical event occurs, the critical event is detected by the nearby sensor nodes. Immediately these sensor nodes should broadcast an alarm message to the entire network. To increase lifetime of the network, sleeping methods are always implemented in WSNs, it increases the delay of alarm message broadcasting. In this paper, they propose a novel sleep scheduling method to reduce the delay of alarm broadcasting from any sensor node in WSNs.