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http://dx.doi.org/10.7840/KICS.2012.37.7B.578

IEEE 802.11-based Power-aware Location Tracking System  

Son, Sang-Hyun (부산대학교 컴퓨터공학과 임베디드시스템 연구실)
Baik, Jong-Chan (UDP 테크놀러지)
Baek, Yun-Ju (부산대학교 컴퓨터공학과 임베디드시스템 연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.37, no.7B, 2012 , pp. 578-585 More about this Journal
Abstract
Location tracking system through GPS and Wi-Fi is available at no additional cost in an environment of IEEE 802.11-based wireless network. It is useful for many applications in outdoor environment. However, a previous systems used for general device to tag. It is unsuitable for power aware location tracking system because general devices is more expensive and non-optimized for tracking. The hand-off method of IEEE 802.11 standard is not enough considering power consumption. This thesis analyzes the previous location tracking systems and proposes power aware system. First, we designed and implemented tag to optimize location tracking. Next, we propose low-power hand-off method and low-power behavior model in implemented tag. The proposed hand-off method resolve power problem by using the location information and behavior model minimize power consumption of tag through power-saving mode and the concept of duty cycle. To evaluating proposed methods and system performance, we perform simulations and experiments in real environment. And then, we calculate tag's power consumption based on the actual measured current consumption of each operation. In a simulation result, the proposed behavior model and hand-off method reduced about 98%, 59% than the standard's hand-off and default behavior model.
Keywords
GPS; Wi-Fi; IEEE 802.11;
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