Wireless Sensor Network Node Sleep Scheduling Mechanism

In order to conserve battery power in very dense sensor networks, usually, we can take such a method: some sensor nodes may be put into the sleep state while other sensor nodes remain active for the sensing and communication tasks. However, determining which of the sensor nodes should be put into the sleep state is non-trivial. As the goal of allowing nodes to sleep is to extend network lifetime, writer proposes and analyzes a Improved Distance-based Scheduling scheme(IDS) in the context of cluster-based sensor networks based on the studies of Randomized Scheduling scheme (RS) and Distance-based Scheduling scheme (DS) . The IDS scheme aims to evenly distribute the energy load of the sensing and communication tasks among all the nodes in the cluster, thereby extending the time until the cluster can no longer provide adequate sensing coverage.Through the analysis, it has obtained the average energy consumption expected value (abbreviation: energy consumption value)of a node and total energy consumption value of the entire cluster in area scope by the center of cluster and radius R. It has analyzed several kind of performance of the IDS scheme with emphasis, including the average energy consumption value, the sensing coverage, the network lifetime, and has carried on the simulation comparison to three kind of sleep schemes performance.Analytical and simulation results are presented to evaluate the proposed IDS scheme. It is shown that the IDS scheme extends the cluster's overall network lifetime significantly while maintaining a similar sensing coverage compared with the DS and the RS schemes for sensor clusters.