Mobile users always require an excellent user experience which is the top challenge faced by today's mobile device designers and producers. Mobile devices are battery constrained, thus developing energy-saving techniques to extend the battery life is critical in terms of the user experience. Since the discrepancy between the device energy and battery energy consumption is becoming large when the battery is approaching to depleted, the battery energy-savings mechanisms (instead of the previously explored device energy-saving mechanisms) that target at the low battery level are highly desirable. Besides the battery life, mobile users demand a good system responsiveness, which is also an essential component in the user experience.
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Yan et al. (2015) studied this question.