Importance

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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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First Claim