Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2004-08-11
2008-07-15
Phu, Sanh D. (Department: 2618)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S011100, C455S456500, C342S464000
Reexamination Certificate
active
07400890
ABSTRACT:
A method for determination of a repeater time delay in a mobile communication network, without affecting a correct positioning of a mobile terminal, is disclosed. The method includes the steps of determining an initial estimated position of a mobile communication terminal to be measured its position, estimating a respective distance between a serving base station and an adjacent base station and the mobile terminal using the initial estimated position, estimating a time difference of arrival of a serving base station signal and an adjacent base station signal received by the mobile terminal using the estimated distances, receiving the time difference of arrival of the serving base station signal and the adjacent base station signal measured from the mobile terminal, calculating a difference between the estimated time difference of arrival and the measured time difference of arrival, and determining the difference as a repeater time delay existing in the serving base station of the mobile terminal, if said difference is larger than a predetermined threshold value. The present invention makes it possible to estimate in advance the clock error in the terminal owing to the repeater time delay in AGPS system, so it can provide the terminal with more precise Acquisition Assistance Information (AAI). Further, such estimation of clock errors in the mobile terminal makes it possible to prevent the failure in acquisition of GPS signals that may occur due to the significant deflection error in the clock operation of the mobile terminal.
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Phu Sanh D.
The Farrell Law Firm P.C.
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