An Energy-Efficiency Coverage-Preserving Node Scheduling Scheme in Wireless Sensor Networks

Wireless sensor networks (WSN) normally consist of lots of energy-limited sensor nodes, the problem of how to extend the lifetime of network with the consideration of coverage-preserving is worthy of study. An energy triggered coverage-preserving node scheduling scheme is proposed in this paper. The scheme mainly includes initial scheduling phase and local wake-up scheduling phase, after initial scheduling, the node whose energy reaches the threshold generates trigger event and updates the threshold, and the nodes relevant to the event are woke up to go into wake-up scheduling for adjustment. Simulation results and theoretical analysis show that the scheme guarantees a better coverage quality, and at the same time, it extends the lifetime of the network effectively.