CPC H04W 4/90 (2018.02) [H04L 65/1016 (2013.01); H04L 65/1069 (2013.01); H04L 65/1073 (2013.01); H04L 65/1104 (2022.05); H04W 60/00 (2013.01); H04W 76/50 (2018.02); H04L 65/1045 (2022.05); H04M 3/5116 (2013.01); H04W 8/20 (2013.01); H04W 12/06 (2013.01); H04W 12/72 (2021.01); H04W 80/10 (2013.01); H04W 92/02 (2013.01)] | 20 Claims |
1. A method of operating a policy and charging rules function (“PCRF”) node to handle an internet protocol multimedia subsystem (“IMS”) emergency call, the method comprising:
receiving an identity request from a proxy call session control function (“P-CSCF”) of an IMS network, the identity request comprising an internet protocol (“IP”) address for a user equipment (“UE”);
responsive to receiving the identity request, determining one or more identifiers of the UE based on the IP address, the one or more identifiers being separate from the IP address, and the one or more identifiers comprising at least one of an international mobile subscriber identity (“IMSI”) and a mobile subscriber integrated digital network number (“MSISDN”);
responsive to determining the one or more identifiers, transmitting an indication of the one or more identifiers of the UE to the P-CSCF;
transmitting a resource allocation request to a packet data network gateway (“PGW”); and
responsive to transmitting the resource allocation request, receiving a resource allocation answer from the PGW indicating that resources for the IMS emergency call have been reserved.
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