Abstract
Battery lifetime has become one of the key control parameter of mobile devices design. Maximizing battery lifetime is a difficult task because of both the nonlinear for battery capacity consumption and the correlation between capacity consumption and battery load. In this paper we address the problem how Dynamic Voltage Scaling (DVS) policy optimizes battery utilization according to battery discharge characteristic for the discrete voltage systems. We analyze the battery discharge characteristic and find that the whole battery discharge takes on a linear discharge phase and a nonlinear discharge phase successively. The proposed DVS policy utilizes different methods to generate the voltage schedule during the different discharge phases. Simulation results show that the policy can effectively reduce battery capacity consumption and increase the workload performed during the battery lifetime.
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