Patent ID: 11902393
Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 3:
4. The method of claim 2, further comprising:
communicating with the second P-CSCF node, via a P-CSCF-to-P-CSCF interface, to initiate a context transfer to the second P-CSCF node; and/or
wherein communicating with the second P-CSCF node, via a P-CSCF-to-P-CSCF interface, comprises at least one of:
requesting that the second P-CSCF node reserve at least one Internet Protocol (IP) address in the second AGW for the second user plane and the local AS;
providing, to the second P-CSCF node, addresses associated with the second user plane and the local AS to allow the second P-CSCF node to set-up the second AGW for the second user plane and the local AS for the IMS PDU session for the UE;
receiving, from the second P-CSCF node, the addresses reserved in the second AGW for the second user plane and the local AS to use; and
subscribing to the AMF to be notified when the location of the UE is outside of a coverage area of the second AGW.