Title:
A Energy Efficient Approach to Processing Spatial Alarms on Mobile Clients
A Energy Efficient Approach to Processing Spatial Alarms on Mobile Clients
Author(s)
Murugappan, Anand
Liu, Ling
Liu, Ling
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Abstract
Many on a daily basis use time based alarms. Spatial alarms extend the very same idea to location-based
triggers, which are fired whenever a mobile user enters the spatial region of the location alarms. Spatial
alarms provide critical capabilities for many mobile
location based applications ranging from personal assistants, inventory tracking to industrial safety warning systems. In this paper we present an energy efficient framework for processing spatial alarms on mobile clients, while maintaining low computation and
storage costs. Our approach to spatial alarms provides two systematic methods for minimizing energy
consumption on mobile clients. First, we introduce the
concept of safe distance to reduce the number of unnecessary mobile client wakeups for spatial alarm evaluation. This mechanism not only reduces the amount
of unnecessary processing of the spatial alarms but
also significantly minimizes the energy consumption
on mobile clients, compared to periodic wakeups, while
preserving the accuracy and timeliness of the spatial
alarms. Second, we develop a suite of techniques
for minimizing the number of location triggers to be
checked for spatial alarm evaluation upon each wakeup.
This further reduces the computation cost and energy
expenditure on mobile clients. We evaluate the scalability and energy-efficiency of our approach using a
road network simulator. Our client based framework
for spatial alarms offers significant improvements on
both system performance and battery lifetime of mobile clients, while maintaining high quality of spatial
alarm services, especially compared to the conventional
approach of periodic wakeup and checking all alarms
upon wakeup.
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Date Issued
2008
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Text
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Technical Report