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Method for locating mobile terminals

  • US RE45,545 E1
  • Filed: 04/11/2013
  • Issued: 06/02/2015
  • Est. Priority Date: 01/31/2004
  • Status: Active Grant
First Claim
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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.

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