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SIP options based location determination

  • US 10,412,537 B2
  • Filed: 08/31/2017
  • Issued: 09/10/2019
  • Est. Priority Date: 08/31/2017
  • Status: Active Grant
First Claim
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1. A method for acquiring location information of a user equipment (UE), the method comprising:

  • receiving a location inquiry associated with the UE, wherein receiving the location inquiry associated with the UE comprises receiving the location inquiry at a gateway mobile location center (GMLC);

    in response to receiving the location inquiry, sending a request to a first session controller, the request including UE information, wherein sending the request to the first session controller comprises one of;

    sending the request to the first session controller in addition to sending a Routing-Info-Request (RIR) to a home subscriber server (HSS), orsending the request to the first session controller instead of sending the RIR to the HSS,wherein the request is a Session Initiation Protocol (SIP) OPTIONS having the UE information included in a request uniform resource identifier (RURI) header or in a TO header of the SIP OPTIONS, and the first session controller is an interrogating call session control function (I-CSCF);

    locating a second session controller, the second session controller having registered location information of the UE, wherein locating the second session controller comprises;

    performing, by the I-CSCF, a location information request (LIR) and a location information answer (LIA) with the HSS to locate a serving call session control function (S-CSCF) where the UE is registered, andlocating the S-CSCF;

    forwarding the request from the first session controller to the second session controller;

    updating the second session controller with current location information of the UE; and

    transmitting the current location information of the UE from the second session controller.

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