TY - JOUR PY - 2010// TI - An IEEE802.15.4-based system for locating children on their school commutes JO - IEICE transactions on fundamentals of electronics, communications and computer sciences A1 - Sugiura, Akihiko A1 - Baba, Ryoichi A1 - Kobayashi, Hideyuki SP - 950 EP - 957 VL - 93 IS - 5 N2 - With the increasing number of crimes and accidents in which children are becoming involved, there is a growing demand for devices to safeguard childrens security by detecting their locations on their way to and from school. This paper proposes a system that uses an IEEE802.15.4-standard network to detect childrens locations. To overcome the susceptibility of radio interference from nearby wireless LANs, frequency division multiplexing is applied to this IEEE802.15.4-based network, toward improving data acquisition from terminal units. The effectiveness of the system was field-tested with elementary school students who used about 400 IEEE 802.15.4-compliant terminal units. An experiment verified that the use of frequency division multiplexing in an environment where radio interference by wireless LANs is strong allowed the network to double the success rate of information communication from terminal units relative to that without frequency division multiplexing. In the experiment for detecting elementary schoolers arrival at and departure from school, the terminal detection rate was 99% and the terminal detection rate on the designated school routes was 90%. These results prove the effectiveness of the system in detecting locations.

LA - SN - 0916-8508 UR - http://dx.doi.org/10.1587/transfun.E93.A.950 ID - ref1 ER -