ImprovingEnergyEfficiency

ImprovingEnergyEfficiency - Improving Energy Efficiency of...

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Click to edit Master subtitle style 8/25/11 Improving Energy Efficiency of Location Sensing on Samori Ball EEL 6788
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8/25/11 Smartphone Energy Consumption Location may be the largest energy hog in sensing applications Most smartphones have two location sensing mechanisms GPS Network Based Triangulation (Net)
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8/25/11 GPS Energy Consumption Test Without GPS a cellphone battery level drops to 94% in an hour With GPS turned on a cellphone battery level drops to 79% in an hour
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8/25/11 GPS Energy Consumption Test
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8/25/11 Network Based Triangulation(NET) Collects information about reachable cell towers (or WiFi access points) to determine location by retrieving a location database Uses less energy than GPS Causes a cellphone battery level to drop to 93% in 1 hour Less accurate than GPS
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8/25/11 GPS vs Net GPS can achieve accuracy up to 10m Net achieves accuracy of about 30m to 100m Net can be more accurate under certain circumstances Net or GPS can be unavailable in different areas
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8/25/11 GPS vs Net
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8/25/11 GPS vs Net
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8/25/11 Reducing Energy Consumption Test was done on an android phone For most sensing applications energy management comes down to GPS usage management Most sensing applications don’t manage their energy usage well No applications coordinate with other applications to manage GPS usage
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8/25/11 System Architecture
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8/25/11 Reducing Energy Consumption Sensing Substitution (SS) Sensing Suppression (SR) Sensing Piggybacking (SP) Sensing Adaptation (SA)
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8/25/11 Reducing Energy Consumption
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Sensing Substitution Android phones allow applications to register which location sensing mechanism they want to use when
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This note was uploaded on 08/25/2011 for the course EEL 6788 taught by Professor Boloni,l during the Spring '08 term at University of Central Florida.

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ImprovingEnergyEfficiency - Improving Energy Efficiency of...

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