Telefonaktiebolaget Lm Ericsson (publ)

Leif Gustavsson

Jan Holm

Jan Dahl

Fredrik Tystad

A method of notifying one or more network nodes in a communications network, comprising an Internet Protocol Multimedia Subsystem, IMS, of a change in RAT used by a user equipment for a communications session, the method comprising at a CSCF prior to set-up of the communications session, indicating by the CSCF to a PCRF that the CSCF requires RAT change notifications for the user equipment, providing a capability indication by the CSCF to the one or more network nodes that the CSCF supports RAT change notifications and receiving from at least one of the one or more network nodes a requirement indication, which indicates that the network node requires RAT change notifications. The method further comprises on receipt of a RAT change notification by the CSCF propagating the RAT change notification to each of the nodes from which a requirement indication has been received.

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Stockholm, Sweden

Leif Gustavsson