Energy utilization concerned sleep scheduling in Wireless Powered Communication Networks

摘要

Wireless Powered Communication Networks (WPCN) is one of the promising approaches to extend the lifetime of the energy-constrained wireless networks such as Wireless Sensor Networks (WSNs). With the advancement in energy harvesting in terms of Wireless Energy Transmission (WET), WPCN overcomes the problem of replacing fixed energy sources such as batteries in difficult access areas of industrial networks. However, residual energy along with harvested energy is not always enough to support the data transmission in IWSNs. This article introduces a energy utilization concerned sleep scheduling in WPCNs with an aim to balance network demands and residual energy with harvested energy. In the proposed scheme, when the harvested energy combined with residual energy is less than the energy consumption due to data transmission, then the sensor node goes to sleep-state in order to prevent death acceleration. As the sleep node obtains enough energy, this node goes to active-state in next epoch if the network demand increases. Finally, a trade-off between the time to harvesting energy and data transmission is obtained through extensive simulation.