Method for decision of time delay by repeater in mobile communication network
First Claim
1. A method for calculating a time delay by a repeater in a mobile communication network, comprising the step of:
- (a) determining an initial estimated position of a mobile communication terminal whose position is to be measured;
(b) estimating a respective distance between a serving base station and an adjacent base station and the mobile terminal using the initial estimated position;
(c) 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;
(d) receiving the time difference of arrival of the serving base station signal and the adjacent base station signal measured from the mobile terminal;
(e) calculating a difference between the estimated time difference of arrival and the measured time difference of arrival; and
(f) 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.
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Accused Products
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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Citations
22 Claims
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1. A method for calculating a time delay by a repeater in a mobile communication network, comprising the step of:
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(a) determining an initial estimated position of a mobile communication terminal whose position is to be measured;
(b) estimating a respective distance between a serving base station and an adjacent base station and the mobile terminal using the initial estimated position;
(c) 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;
(d) receiving the time difference of arrival of the serving base station signal and the adjacent base station signal measured from the mobile terminal;
(e) calculating a difference between the estimated time difference of arrival and the measured time difference of arrival; and
(f) 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for calculating a time delay by a repeater in a mobile communication network, comprising the step of:
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(a) determining an initial estimated position of a mobile communication terminal whose position is to be measured;
(b) estimating a respective distance between a serving base station and an adjacent base station and the mobile terminal using the initial estimated position;
(c) estimating a time difference of arrival between a serving base station signal and a plurality of adjacent base station signals received by the mobile terminal using the;
estimated distances;
(d) receiving the time difference of arrival between the serving base station signal and the plurality of adjacent base station signals measured from the mobile terminal;
(e) respectively calculating differences between the estimated time differences of arrival and the measured time differences of arrival; and
(f) when at least one of said calculated differences is larger than a predetermined threshold value, determining the largest one of said differences larger than the threshold value, as a repeater time delay existing in the serving base station of the mobile terminal.
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10. A method for determining a repeater time delay of a base station in a mobile communication network, comprising the steps of:
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(i) estimating an arrival time difference in a serving base station signal and an adjacent base station signal of a mobile communication terminal to be measured its position, and then calculating a time delay caused by a repeater in the serving base station using the estimated arrival time difference and a measured arrival time difference in the serving base station signal and the adjacent base station signal measured by the mobile communication terminal; and
(ii) if a resultant value of a difference between the measured time difference of arrival and the estimated time difference of arrival, plus the calculated time delay by the serving base station repeater is larger than a predetermined first threshold value, then determining the resultant value as a repeater time delay of the associated adjacent base station. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification