Roaming LTE emergency call with call back number retrieval
First Claim
1. One or more non-transitory computer-readable media of a Visited Public Land Mobile Network (VPLMN) storing computer-executable instructions that upon execution cause one or more processors to perform acts comprising:
- receiving an anonymous Session Initiation Protocol (SIP) invite message at a Proxy Call Session Control Function (P-CSCF) of the VPLMN for a Long-Term Evolution (LTE) emergency call initiated from a wireless user device that is roaming on the VPLMN, the anonymous SIP invite message lacking a Mobile Station International Subscriber Directory Number (MSISDN) of the wireless user device and including an International Mobile Equipment Identity (IMEI) of the wireless user device;
sending the anonymous SIP invite message from the P-CSCF to an Emergency Call Session Control Function (E-CSCF) of the VPLMN for the E-CSCF to forward the anonymous SIP invite message to a Location Retrieval Function (LRF) in a Gateway Mobile Location Centre (GMLC) of the VPLMN;
obtaining a MSISDN of the wireless user device that matches the IMEI in the anonymous SIP invite message via the LRF from a database of the GMLC, the MSISDN being obtained from the wireless user device and stored in the database of the GMLC during an initial connection bearer set up between the wireless user device and a core network of the VPLMN; and
sending a supplemented SIP invite message that includes the MSISDN from the GMLC to the E-CSCF for the E-CSCF to route the LTE emergency call with the MSISDN to a particular Public Safety Answering Point (PSAP).
3 Assignments
0 Petitions
Accused Products
Abstract
A roaming wireless user device on a Visited Public Land Mobile Network (VPLMN) may initiate a Long-Term Evolution (LTE) emergency call to a Public Safety Answering Point (PSAP). Accordingly, a Proxy Call Session Control Function (P-CSCF) of the VPLMN may receive an anonymous Session Initiation Protocol (SIP) invite message for the LTE emergency call. The anonymous SIP invite message lacks a Mobile Station International Subscriber Directory Number (MSISDN) of the wireless user device but has an International Mobile Equipment Identity (IMEI) of the wireless user device. The anonymous SIP invite message is forwarded to a Location Retrieval Function (LRF) in a Gateway Mobile Location Center (GMLC) of the VPLMN. The LRF obtains a MSISDN of the wireless user device that matches the IMEI in the anonymous SIP invite message from a database of the GMLC, such that the MSISDN is routed with the LTE emergency call to the PSAP.
7 Citations
20 Claims
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1. One or more non-transitory computer-readable media of a Visited Public Land Mobile Network (VPLMN) storing computer-executable instructions that upon execution cause one or more processors to perform acts comprising:
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receiving an anonymous Session Initiation Protocol (SIP) invite message at a Proxy Call Session Control Function (P-CSCF) of the VPLMN for a Long-Term Evolution (LTE) emergency call initiated from a wireless user device that is roaming on the VPLMN, the anonymous SIP invite message lacking a Mobile Station International Subscriber Directory Number (MSISDN) of the wireless user device and including an International Mobile Equipment Identity (IMEI) of the wireless user device; sending the anonymous SIP invite message from the P-CSCF to an Emergency Call Session Control Function (E-CSCF) of the VPLMN for the E-CSCF to forward the anonymous SIP invite message to a Location Retrieval Function (LRF) in a Gateway Mobile Location Centre (GMLC) of the VPLMN; obtaining a MSISDN of the wireless user device that matches the IMEI in the anonymous SIP invite message via the LRF from a database of the GMLC, the MSISDN being obtained from the wireless user device and stored in the database of the GMLC during an initial connection bearer set up between the wireless user device and a core network of the VPLMN; and sending a supplemented SIP invite message that includes the MSISDN from the GMLC to the E-CSCF for the E-CSCF to route the LTE emergency call with the MSISDN to a particular Public Safety Answering Point (PSAP). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A computer-implemented method, comprising:
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receiving an anonymous Session Initiation Protocol (SIP) invite message at a Proxy Call Session Control Function (P-CSCF) of a Visited Public Land Mobile Network (VPLMN) for a Long-Term Evolution (LTE) emergency call initiated from a wireless user device that is roaming on the VPLMN, the anonymous SIP invite message lacking a Mobile Station International Subscriber Directory Number (MSISDN) of the wireless user device and including an International Mobile Equipment Identity (IMEI) of the wireless user device; sending the anonymous SIP invite message from the P-CSCF to an Emergency Call Session Control Function (E-CSCF) of the VPLMN for the E-CSCF to forward the anonymous SIP invite message to a Location Retrieval Function (LRF) in a Gateway Mobile Location Centre (GMLC) of the VPLMN; obtaining a MSISDN of the wireless user device that matches the IMEI in the anonymous SIP invite message via the LRF from a database of the GMLC; and sending a supplemented SIP invite message that includes the MSISDN from the GMLC to the E-CSCF for the E-CSCF to route the LTE emergency call with the MSISDN to a particular Public Safety Answering Point (PSAP). - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. One or more computing devices on a Visited Public Land Mobile Network (VPLMN), comprising:
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one or more processors; and memory having instructions stored therein, the instructions, when executed by the one or more processors, cause the one or more processors to perform acts comprising; receiving an anonymous Session Initiation Protocol (SIP) invite message at a Proxy Call Session Control Function (P-CSCF) of the VPLMN for a Long-Term Evolution (LTE) emergency call initiated from a wireless user device that is roaming on the VPLMN, the anonymous SIP invite message lacking a Mobile Station International Subscriber Directory Number (MSISDN) of the wireless user device and including an International Mobile Equipment Identity (IMEI) of the wireless user device; sending the anonymous SIP invite message from the P-CSCF to an Emergency Call Session Control Function (E-CSCF) of the VPLMN for the E-CSCF to forward the anonymous SIP invite message to a Location Retrieval Function (LRF) in a Gateway Mobile Location Centre (GMLC) of the VPLMN; obtaining a MSISDN of the wireless user device that matches the IMEI in the anonymous SIP invite message via the LRF from a database of the GMLC; retrieving a PSAP Uniform Resource Identifier (URI) of a particular Public Safety Answering Point (PSAP) via the LRF of the GMLC; and sending a supplemented SIP invite message that includes the MSISDN and the PSAP URI from the GMLC to the E-CSCF for the E-CSCF to route the LTE emergency call with the MSISDN to the particular PSAP. - View Dependent Claims (18, 19, 20)
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Specification