Methods and nodes for facilitating a pdu session procedure in interworking networks

A non-transitory computer-readable storage medium comprising instructions which, when executed by at least one processor of a Packet Data Network Gateway Control plane Function+Session Management Function (PGW-C+SMF) for facilitating a procedure for a Protocol Data Unit (PDU) session for a User Equipment (UE) in a 5th Generation System (5GS) network, wherein the 5GS network interworks with an Evolved Packet System (EPS) network, and the PGW-C+SMF, that supports interworking of the 5GS network with the EPS network, is selected for managing the PDU session, are capable of causing the PGW-C+SMF to perform operations comprising:

• receiving an indication from an Access and mobility Management Function (AMF) indicating whether the PDU session supports interworking with the EPS network, wherein the indication is determined based on a capability of the UE, a subscription data of the UE, or both the capability of the UE and the subscription data of the UE, wherein a value of the capability of the UE comprises S1 mode supported, or a value of the subscription data of the UE comprises core network type restriction to the EPS network, or both;
• and
• determining whether the PDU session supports interworking with the EPS network according to the indication.