Optimal node scheduling for heterogeneous energy harvesting sensor networks

A fundamental problem in Wireless Sensor Networks (WSNs) is to balance energy and extend network lifetime, whereby the goal is to guarantee a long time monitoring in area-of-interest. To this end, this paper propose a Heterogeneous Energy Harvesting uniform distribution Wireless Sensor Networks (HEH-WSN) to maximize network lifetime by effective scheduling sensor node status whilst ensuring the coverage rate. Firstly, we split the issue of how to extend lifetime in HEH-WSN into two simple problems, how to improve renewable energy utilization and how to determine sensor node status. Then we present a Heterogeneous Energy Harvesting Scheduling (HEHS) strategy to solve the problems, respectively. Based on HEHS, we conclude several judgment rules to judge node status by number of neighbor node. Our results show HEHS has a longer network lifetime than similar algorithm developed for finite battery WSNs, and with the increasing of ξ, network lifetime extends with a ladder shape.