US 2023/0403670 A1 · SIP-DEREGISTRATION BY EVOLVED PACKET CORE NETWORK

Abstract

Methods, media, and systems provide a more robust IP Multimedia Subsystem (IMS) deregistration process that deregisters a user equipment under circumstances that currently prevent a timely deregistration. For example, the aspects deregister a user equipment (UE) from an IMS core even when the UE disconnects from the Packet Data Network Gateway (PGW) or other EPC component without sending a SIP deregistration to the IMS core. The technology described herein automatically generates a deregistration message and communicates the message to the IMS core (e.g., a Session Termination Request Communication using Diameter Protocol between a PCRF & a P-CSCF) upon determining the session with the EPC is terminated. The UE is then deregistered from the IMS core.

Claims20

Dependent claims

A system for deregistering a user equipment (UE) from an IMS core, the system comprising:

one or more processors;
and
computer memory storing computer-usable instructions that, when executed by the one or more processors, perform operations comprising:
receiving, at a packet data node Gateway (PGW), a request to disconnect the UE from a communication session, the request specifying an IP address assigned to the UE;
terminating the communication session in response to the request;
communicating, from the PGW to a PCRF (Policy and Charging Rules Function), a message indicating the UE has disconnected;
and
communicating, from the PCRF, a deregistration message to an IMS component with instructions to deregister the IP address within the IMS core.

5 more elements

Dependencies are inferred from the claim text.

Sip-deregistration by evolved packet core network

Life of this patent

Sip-deregistration by evolved packet core network

Life of this patent

Abstract

Claims20