Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2005-12-06
2005-12-06
Trinh, Sonny (Department: 2687)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S456200, C455S456300, C455S456600, C455S404100, C455S404200, C455S422100, C455S440000, C340S988000, C340S996000
Reexamination Certificate
active
06973320
ABSTRACT:
Timing Advance information is obtained from base stations (103–105), and is utilized by a remote unit (113) to approximate the Time of Arrival (TOA) of the signals from each base station. The remote unit (113) accesses a single base station to determine its timing advance. In order to increase accuracy, the remote unit (113) then repeats the process, but during the next iteration, the transmission timing is advanced or delayed by a fraction of a bit (e.g. ¼ bit). The base station responds with a new timing advance value. This process is repeated until it is determined how many fractions of bit increments the remote unit (113) is away from a known timing advance boundary of the base station. Once known, this information is utilized to determine the location of the remote unit (113).
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Brown Larry Michael
Miller Marty Frank
Zerfas Norman Joseph
Motorola Inc.
Nguyen Khai
Trinh Sonny
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