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Recent advances in wireless energy transfer technology propel the developments of renewable sensor networks. To sustain the operation of a sensor network, a mobile charger is used to recharge each node. Consider each node's recharge request as a task with a soft due time, the mobile charger needs to dynamically schedule these tasks. This scheduling problem is very challenging, since both the nodes' due times and their locations have to be considered. Existing solutions to this problem usually assume fixed paths generated by the travelling salesman or Hamilton cycle algorithms. These solutions suffer from high deadline miss ratios. In this paper, the authors investigate maximum response ratio based scheduling algorithms that can dynamically select the path of chargers for higher network coverage ratio.
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