METHOD FOR LOCATING MOBILE TERMINALS
First Claim
1. A home Public Land Mobile Network (PLMN) method for locating mobile terminals, comprising the steps of:
- a) receiving a request message of location service for a target terminal which is roaming;
b) checking information of a visited PLMN visited by the target terminal, in response to the request message of location service;
c) determining if the visited PLMN provides location assistance information using the checked information of the visited PLMN;
d) if the visited PLMN does not provide location assistance information, calculating by the home PLMN, using information corresponding to a cell ID of the target terminal in the visited PLMN, location assistance information for performing Network Assisted Global Positioning System (A-GPS) positioning of the target terminal; and
e) transferring the location assistance information to the target terminal.
1 Assignment
0 Petitions
Accused Products
Abstract
A method for locating mobile terminals is provided. First, information of a home Public Land Mobile Network (PLMN) of a target mobile terminal, the location of which is to be determined, is checked in response to a location service request from a client. Then, information of a visited PLMN, where the target mobile terminal is currently located, is checked based on the checked information of the home PLMN. The home PLMN calculates location assistance information of the visited PLMN using specific location information of the visited PLMN. The location assistance information is transferred to the target mobile terminal. This allows location information of a mobile terminal to be obtained irrespective of the area or communication network where the mobile terminal is located. It is thus possible to locate a mobile terminal in an area where no location assistance information is provided.
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Citations
68 Claims
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1. A home Public Land Mobile Network (PLMN) method for locating mobile terminals, comprising the steps of:
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a) receiving a request message of location service for a target terminal which is roaming; b) checking information of a visited PLMN visited by the target terminal, in response to the request message of location service; c) determining if the visited PLMN provides location assistance information using the checked information of the visited PLMN; d) if the visited PLMN does not provide location assistance information, calculating by the home PLMN, using information corresponding to a cell ID of the target terminal in the visited PLMN, location assistance information for performing Network Assisted Global Positioning System (A-GPS) positioning of the target terminal; and e) transferring the location assistance information to the target terminal. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 61, 62, 63, 64, 65, 66)
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2. (canceled)
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3. (canceled)
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11. A home Public Land Mobile Network (PLMN) method for locating mobile terminals, comprising the steps of:
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a) receiving a request message of location service for a target terminal from a visited PLMN which the target terminal is roaming in, the request message including at least one a Cell ID; b) checking information of the visited PLMN visited by the target terminal, which is roaming, in response to the request message of location service; c) determining if the visited PLMN visited by the target terminal provides location assistance information; d) if the visited PLMN doesn'"'"'t provide location assistance information, receiving information corresponding to the cell ID of the target terminal from the visited PLMN at the home PLMN, and calculating by the home PLMN, using the information corresponding to the cell ID of the target terminal, the location assistance information for performing Network Assisted Global Positioning System (A-GPS) positioning of the target terminal; and e) transferring the location assistance information to the target terminal. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 67, 68)
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12. (canceled)
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13. (canceled)
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21-60. -60. (canceled)
Specification