Making Sensor Networks Immortal: An Energy-Renewal Approach with Wireless Power Transfer
Wireless sensor networks are constrained by limited battery energy. Thus, finite network lifetime is widely regarded as a fundamental performance bottleneck. Recent breakthrough in the area of wireless power transfer offers the potential of removing this performance bottleneck, i.e., allowing a sensor network to remain operational forever. In this paper, the authors investigate the operation of a sensor network under this new enabling energy transfer technology. They consider the scenario of a mobile charging vehicle periodically traveling inside the sensor network and charging each sensor node's battery wirelessly. They introduce the concept of renewable energy cycle and offer both necessary and sufficient conditions.