Method of locating and measuring a mobile station
First Claim
1. A method of locating and measuring a mobile station (MS), comprising:
- a. selecting a reference base station and neighbor base stations according to quality of received signals by a Mobile Location Center;
b. calculating parameters of a large search window and a effective search window;
a large search window starting location Tstart and stop location Tstop and an effective search window starting location tstart and stop location tstop, according to information concerned about the reference base station, neighbor base stations and the MS by the Mobile Location Center, and initiating a measurement request to the MS;
c. setting a large search window and an effective search window for the neighbor base stations according to measured parameters and the parameters of a large search window and a effective search window by the MS;
d. determining first path of the neighbor base stations with the large search window and the effective search window by the MS;
e. outputting first path determination result of the neighbor base station downlink signal by the MS;
f. making correlation operation with first path of the neighbor base station downlink signal and first path of the reference base station downlink signal, and obtaining Time Difference Of Arrival (TDOA);
g. locating the MS according to two or more than two TDOAs obtained in Step f.
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Accused Products
Abstract
The invention discloses a method of locating and measuring a mobile station, which relates with the radio locating technique in mobile communication field. Comparing with the conventional radio locating technique, the method improves the first path determination method of a neighbor base station downlink signal as follows: with geometrical relationship such as the distance between a MS to the reference base station and the distance between a neighbor base station to the reference base station, an effective range of the downlink signal first path of the neighbor base station can be calculated; the effective range is an effective search window that is shorter than the original large search window, and the first path determination of the neighbor base station downlink signal is made within the effective search window. The invention raises the first path determination accuracy of a neighbor base station downlink signal, so the mobile station locating accuracy is raised too.
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Citations
7 Claims
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1. A method of locating and measuring a mobile station (MS), comprising:
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a. selecting a reference base station and neighbor base stations according to quality of received signals by a Mobile Location Center; b. calculating parameters of a large search window and a effective search window;
a large search window starting location Tstart and stop location Tstop and an effective search window starting location tstart and stop location tstop, according to information concerned about the reference base station, neighbor base stations and the MS by the Mobile Location Center, and initiating a measurement request to the MS;c. setting a large search window and an effective search window for the neighbor base stations according to measured parameters and the parameters of a large search window and a effective search window by the MS; d. determining first path of the neighbor base stations with the large search window and the effective search window by the MS; e. outputting first path determination result of the neighbor base station downlink signal by the MS; f. making correlation operation with first path of the neighbor base station downlink signal and first path of the reference base station downlink signal, and obtaining Time Difference Of Arrival (TDOA); g. locating the MS according to two or more than two TDOAs obtained in Step f. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification