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Lifetch makes the world a safer place |
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System Organization The Lifetch system consists of the following modules interacting with each other: ICU, Command Center (CC) and optionally a Relay. It uses the existing commercial cellular network as a communication medium. System Hardware Elements ICU - Intelligent Communication Unit. Each person under Lifetch protection carries one ICU unit. The ICU contains a GPS receiver, an RF transceiver and other sensors. The ICUs exchange data (messages containing processed information from their sensors) between themselves and possibly a Relay. The ICU users may form groups, and ICU is used as a monitoring device for the group leader allowing him to control the status of group members.
ICUs communicate with the Command Center through GPRS capable cellular phones that most of the system users have. The interface between an ICU unit and a phone is a Bluetooth or optionally an USB link. Relay - has an Internet connection and communicates with the ICUs through RF. Relay serves as an alternative gateway between the distributed RF network and the Command Center. Command Center Software Emergency Situation Detection Subsystem - distributed rule-based system detecting potentially dangerous situations based on correlations in data gathered from ICUs.
Position Prediction Subsystem - this is terrain-aware software establishing the probable position of a missing person with significant accuracy, relying on his/her last reported position, his/her latest direction and velocity (calculated basing on location history). Message Distribution Subsystem - broadcasting event messages to all people in a certain area - e.g. about forecasted rapid changes in weather conditions. On-demand Information Service Subsystem - provides ICU users with requested maps and other information. Administration Subsystem - allows the operator to perform maintenance tasks.
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