Direct amplifying station and positioning method for mobile station thereof
First Claim
1. A method for positioning a mobile station including a repeater comprising a cell identifier generator module in a downlink circuit structure of the repeater, wherein the cell identifier generator module comprises:
- a synchronization searching unit for searching for a base station pilot signal;
a time delay unit for generating a fixed delay according to the searching result from the synchronization searching unit; and
a cell identifier signal generating unit for generating a cell identifier signal;
wherein is a delay between a frame start time of the base station pilot signal and a frame start time of the cell identifier signal is the fixed delay;
the method comprising the steps of;
(1) issuing the cell identifier signal, the fixed delay, and a search window width from the repeater in response to a positioning request from the mobile station, wherein the cell identifier signal is searched in a time range defined by the search window width and the fixed delay;
(2) measuring a Time Difference Of Arrival (TDOA) between the cell identifier signal and the base station pilot signal and reporting the measured TDOA, by the mobile station;
(3) determining whether the value of TDOA equals to the fixed delay;
if so, going to step (4);
otherwise going to step (7);
(4) measuring a Time Of Arrival (TOA), TOAm, from the mobile station to the base station through the repeater;
(5) determining a value of TOAtrans with the formula;
TOAtrans=TOAm−
TOAc, wherein the TOAtrans means TOA from the mobile station to the repeater, and the TOAc, means a calibrated TOA from the repeater to the base station;
(6) calculating the distance between the mobile station and the repeater through multiplying TOAtrans with light velocity; and
(7) determining the position of the mobile station.
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Abstract
The present invention relates to a repeater for positioning mobile station and a method thereof. The repeater according to the present invention is implemented through adding a cell identifier generator module to the downlink circuit structure of a conventional repeater; said cell identifier generator module includes: a synchronization searching unit designed to search for base station synchronization signal, a time delay unit designed to generate a fixed delay between start time of cell identifier signal frame and start time of base station pilot signal frame, and a cell identifier signal generating unit designed to generate cell identifier signal code word. The mobile station positioning method determines the mobile station is in the coverage of the repeater on the basis that the time difference between base station pilot signal and cell identifier signal is consistent to the fixed delay; then the method utilizes TOA (Time of Arrival) measuring function to determine the distance from the mobile station to the repeater; thus it improves positioning accuracy of mobile stations in the coverage of the repeater. The repeater for positioning mobile station is easy to implement and can meet the positioning requirement of a plurality of mobile stations in the coverage of the repeater.
26 Citations
4 Claims
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1. A method for positioning a mobile station including a repeater comprising a cell identifier generator module in a downlink circuit structure of the repeater, wherein the cell identifier generator module comprises:
- a synchronization searching unit for searching for a base station pilot signal;
a time delay unit for generating a fixed delay according to the searching result from the synchronization searching unit; and
a cell identifier signal generating unit for generating a cell identifier signal;
wherein is a delay between a frame start time of the base station pilot signal and a frame start time of the cell identifier signal is the fixed delay;
the method comprising the steps of;(1) issuing the cell identifier signal, the fixed delay, and a search window width from the repeater in response to a positioning request from the mobile station, wherein the cell identifier signal is searched in a time range defined by the search window width and the fixed delay; (2) measuring a Time Difference Of Arrival (TDOA) between the cell identifier signal and the base station pilot signal and reporting the measured TDOA, by the mobile station; (3) determining whether the value of TDOA equals to the fixed delay;
if so, going to step (4);
otherwise going to step (7);(4) measuring a Time Of Arrival (TOA), TOAm, from the mobile station to the base station through the repeater; (5) determining a value of TOAtrans with the formula;
TOAtrans=TOAm−
TOAc, wherein the TOAtrans means TOA from the mobile station to the repeater, and the TOAc, means a calibrated TOA from the repeater to the base station;(6) calculating the distance between the mobile station and the repeater through multiplying TOAtrans with light velocity; and (7) determining the position of the mobile station. - View Dependent Claims (2, 3, 4)
- a synchronization searching unit for searching for a base station pilot signal;
Specification