H - Electricity – 04 – Q
Patent
H - Electricity
04
Q
H04Q 7/32 (2006.01) G01S 5/14 (2006.01) G08B 3/10 (2006.01) H04Q 7/38 (2006.01)
Patent
CA 2251996
Transmitting identification codes of fixed units by wireless telephones to a central computer via a wireless switching system. The central computer uses the identification codes to locate the wireless telephones. Since a wireless telephone already has the capability for communicating utilizing a wireless protocol, the only additional cost to the wireless telephone is the ability to receive the transmission from the fixed units. The wireless telephones use a first wireless media for transmission, and the fixed units use a second wireless media for transmission. Further, each fixed unit consist only of a transmitter. The second media maybe infrared or ultrasonic transmission. If the wireless telephone fails to detect a fixed unit, the wireless telephone transmits this fact back to the central computer. This is done so as to determine locations that are not serviced by a fixed unit and also to detect failed fixed units. The central computer maintains a log of fixed units with which a wireless telephone had been previously identified. This allows the central computer to determine where there is a need for a fixed unit or which fixed unit has failed. The fixed units can be battery operated. When the controller controlling the fixed unit determines that the battery is reaching a low state in the fixed unit, the controller transmits this information along with the identification code so that the low battery indication can be relayed to the central computer.
Griffith Gary L.
Moran John C.
Kirby Eades Gale Baker
Lucent Technologies Inc.
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