A ZigBee-based sensor node for tracking people's locations

Authors:
Satoshi Takahashi;Jeffrey Wong;Masakazu Miyamae;Tsutomu Terada;Haruo Noma;Tomoji Toriyama;Kiyoshi Kogure;Shojiro Nishio
Affiliations:
ATR Knowledge Science Laboratories, Kyoto, Japan and Osaka University, Suita, Osaka, Japan;Simon Fraser University, Vancouver, BC, Canada;ATR Knowledge Science Laboratories, Kyoto, Japan;ATR Knowledge Science Laboratories, Kyoto, Japan and Kobe University, Kobe, Hyogo, Japan;ATR Knowledge Science Laboratories, Kyoto, Japan;ATR Knowledge Science Laboratories, Kyoto, Japan;ATR Knowledge Science Laboratories, Kyoto, Japan;Osaka University, Suita, Osaka, Japan
Venue:
CASEMANS '08 Proceedings of the 2nd ACM international conference on Context-awareness for self-managing systems
Year:
2008

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Abstract

A sensor network system has been developed for tracking people's locations in workplaces as part of a ubiquitous network system for providing context-aware services in daily activities. Since the installation of such a sensor is desired any place within its target domain with few limitations, it must operate by battery for a relatively long time, e.g., one month. To satisfy this requirement, we designed a battery-operated sensor node based on ZigBee technology and extended its operation period by developing a flexible sleep control protocol and a high-accuracy time synchronization mechanism between sensor nodes to reduce power consumption. From simulations based on actual data collected, we confirmed that a sensor node located in a hospital's medical ward can work over 21 days using four AA Ni-H batteries.