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The Active Badge Location System

ActiveBadge:2WirelessNetTseng. How Do We Locate People?. Goal: efficient location and coordination of staff in a large organization.Ex: location of doctors, staffs, and patients in a hospital.Existing Solutions:broadcastinga phone to call several possible numbersa beeper with audible signal or call-back numberkey card (????) for access control:.

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The Active Badge Location System

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    1. ActiveBadge:1 WirelessNet Tseng The Active Badge Location System R. Want, A. Hopper, V. Falcao, and J. Gibbon in ACM Trans. on Information Systems, Vol. 10, No. 1, Jan. 1992, pp. 91-102 -- presented by Yu-Chee Tseng --

    2. ActiveBadge:2 WirelessNet Tseng How Do We Locate People? Goal: efficient location and coordination of staff in a large organization. Ex: location of doctors, staffs, and patients in a hospital. Existing Solutions: broadcasting a phone to call several possible numbers a beeper with audible signal or call-back number key card (????) for access control:

    3. ActiveBadge:3 WirelessNet Tseng Active Badge System each badge that can automatically emit a unique code a network of sensors placed around the building a master server, also connected to the network, makes the location information available to outside world

    4. ActiveBadge:4 WirelessNet Tseng Active Badge Design (cont.) Pulse-width modulated infrared (IR) signaling: transmission range: 6 meters can reflect by office partitions, but will not penetrate like radio signals emits a unique code every 15 sec, for about 1/10 sec. Quite power-saving. Can last for > 1 year. Has a light detector. On dark (e.g., badge placed in a drawer), increase emitting period. Can last for > 4 years. Good performance to wear on breast pocket; OK to wear on belt or waist.

    5. ActiveBadge:5 WirelessNet Tseng Badge Sensor and Networking many sensors can be installed, as the unit cost is very low. can be placed on walls, entrances, exits, corridors, public areas, etc. sensor ---(RS232)---> computer ---(Ethernet)--> server up to 128 sensors can be supported by a computer a FIFO buffer can store 20 badge data items (to avoid network congestion) sensor networking: 4 wires (2 for power supply, 1for control/poll, and 1 for data) conform to telephone cabling, thus easy for cabling and low-cost

    6. ActiveBadge:6 WirelessNet Tseng Badge Sensor and Networking (cont.) fig. 2

    7. ActiveBadge:7 WirelessNet Tseng Application: Active Office a system integrating name location information phone network commands supported: FIND (name) WITH (name): who are the other badges nearby name now LOOK (location) NOTIFY (name) HISTORY (name)

    8. ActiveBadge:8 WirelessNet Tseng Active Office Display Screen Fig. 3

    9. ActiveBadge:9 WirelessNet Tseng Benefits of Active Office automatic re-direction of incoming calls relieve burden of receptionist you have less chance of missing some important calls you are waiting for receptionist can easily tell whether a person is in or not easier when calling for a meeting easy to identify visitors to our organization

    10. ActiveBadge:10 WirelessNet Tseng Conclusions Future: extend to 2-way communication Future: combine with motion detector can provide high security if a person moves without active badge being detected, an alarm can be alerted. Mobile 911 (emergency call)

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