Collaborative Mobile Charging for Sensor Networks
The limited battery capacity of sensor nodes has become the biggest impediment to Wireless Sensor Network (WSN) applications. Two recent breakthroughs in the areas of wireless energy transfer and rechargeable lithium batteries promise the use of mobile vehicles, with high volume batteries, as mobile chargers that transfer energy to sensor nodes wirelessly. In this paper, for the first time, the authors envision a novel charging paradigm: collaborative mobile charging, where mobile chargers are allowed to charge each other. They investigate the problem of scheduling multiple mobile chargers, which collaboratively recharge sensors, to maximize the ratio of the amount of payload energy to overhead energy, such that every sensor will not run out of energy.