megavideolinks
Joined: 19 Nov 2011
Posts: 273
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 Posted: Sun Dec 04, 2011 7:49 am Post subject: An Analysis of Power Consumption in a Smartphone |
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Mobile consumer-electronics devices, especially phones,
are powered from batteries which are limited in size and
therefore capacity. This implies that managing energy
well is paramount in such devices.
Good energy management requires a good understanding of where and how the energy is used. To this end we
present a detailed analysis of the power consumption of
a recent mobile phone, the Openmoko Neo Freerunner.
We measure not only overall system power, but the exact
breakdown of power consumption by the device’s main
hardware components. We present this power breakdown
for micro-benchmarks as well as for a number of realistic usage scenarios. These results are validated by overall power measurements of two other devices: the HTC
Dream and Google Nexus One.
We develop a power model of the Freerunner device
and analyse the energy usage and battery lifetime under
a number of usage patterns. We discuss the signi?cance
of the power drawn by various components, and identify
the most promising areas to focus on for further improvements of power management. We also analyse the energy
impact of dynamic voltage and frequency scaling of the
device’s application processor.
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