1 - 7 of 7 Chapters
[Managing energy consumption, primarily with the goal of extending the lifetime of battery-powered devices, is widely recognized as a fundamental challenge in mobile computing and wireless communication. The limited availability of battery energy has emerged as a significant problem with the...
[This chapter presents basic energy terminology and widely accepted metrics. It describes mechanisms provided by hardware to allow systems to manage how power is consumed in mobile devices. It addresses the measurement techniques for calibrating system models and tools for experimental evaluation.]
[This chapter begins by considering idleness and the challenges involved in detecting idle periods. We focus on managing power state transitions for a single device, exploiting the idle time offered by the access pattern for the device. We describe examples of policies that, given a workload,...
[This chapter discusses scheduling policies that exploit dynamic frequency and voltage scaling in processors. The strength of scaling frequency and voltage together is that it provides quadratic energy savings with only a linear performance cost, as explained in Section 2.1.3. Table 2.2 gives...
[While the majority of work in energy management for mobile computing has focused on a single component at a time and the savings in consumption by that device, this chapter discusses the interactions and tradeoffs among the power management policies of multiple devices. There are both negative...
[At several points in the previous chapters, we have alluded to projects that included a role for the applications to provide more information to assist the system in making power management decisions. Users may also want to respond with alternative behavior when energy supplies are low. In this...
[There is widespread recognition within the mobile computing R&D community of the importance of energy management. This lecture has focused on the demand side of the energy story. It has highlighted some of the significant contributions that have been made to our understanding of how to manage...
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