Sleep Scheduling for Critical Event Monitoring in Wireless Sensor Networks

Over the past decade, local monitoring has been shown to be a powerful technique for improving security in multihop wireless sensor networks (WSNs). However, local monitoring as it is currently practiced is costly in terms of energy consumption. Sleep-wake protocols are critical in sensor networks to ensure long-lived operation. However, an open problem is how to develop efficient mechanisms that can be incorporated with sleep-wake protocols to ensure both long lived operation and a high degree of security. To overcome this problem by using local monitoring, each node oversees part of the traffic going in and out of its neighbors to determine if the behavior is suspicious, such as, unusually long delay in forwarding a packet. Here, a protocol is used to make local monitoring parsimonious in its energy consumption and to integrate it with any extant sleep-wake protocol in the network. Analytically proved that the security coverage is not weakened by the protocol. Then perform simulations in GLOMOSIM to demonstrate that the performance of local monitoring is practically unchanged.