The Active Badge Location System
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Transcript of The Active Badge Location System
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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 --
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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 (刷卡驗證 ) for access control:
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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
Active Badge
Active Badge
...Active Badge
Badge Sensor
Badge Sensor
Server/Applicationnetwork
wirelessIR
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Active Badge Design (cont.)
Pulse-width modulated infrared (IR) signaling: transmission range: 6 meterscan 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.
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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 computera 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
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Badge Sensor and Networking (cont.)
fig. 2
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Application: Active Office
a system integratingnamelocation informationphone network
commands supported:FIND (name)WITH (name): who are the other badges nearby name nowLOOK (location)NOTIFY (name)HISTORY (name)
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Active Office Display Screen
Fig. 3
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Benefits of Active Office
automatic re-direction of incoming callsrelieve burden of receptionistyou 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
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Conclusions
Future: extend to 2-way communication
Future: combine with motion detectorcan provide high securityif a person moves without active badge being detected, an
alarm can be alerted. Mobile 911 (emergency call)