Research On Energy Replenishment And Data Collection For Wireless Rechargeable Sensor Networks

The biggest bottleneck of wireless sensor networks is the limitation of total network energy.With the rapid development of micro-electronic integrated circuits and wireless energy transmission technology,wireless rechargeable sensor networks replace the traditional sensor network which use of the disposable battery.Using mobile charging equipment for the sensor network to provide sustainable energy which become the emerging trends in research and development.In this paper,we first study the rechargeable sensor network without considering data collection.On the charging mechanism,a concept of region charging priority is proposed.The consideration of original study on the charging planning,such as the order of node's charging request,the residual energy and the position,which is extended to the discussion of the residual energy and position of the whole node in a sub-region.A charging strategy MJRL,which can maximize the useful work of charging and maximize the network lifetime.The method of regional charging reduces the distance of the charger movement and improves the usefulness of the charger and the network lifetime.The simulation results show that the MJRL mobile charging strategy can effectively improve the usefulness of the network charging and reduce the total moving distance of the charger.Then,we continue to discuss the joint research on mobile charging and data collection.The mobile charger not only replenishes the low-power node,but also collects data at the locations of the charged nodes.We propose a method MMRE which can maximize the minimum residual energy of the node.The largest moving distance of the charger is limited.The simulation results can verify that the new charging scheme can effectively improve the minimum residual energy of the nodes in the network and prolong the network lifetime.