Section: 4.11.4.3.4 Interaction with PCC
Content: When interworking with 5GS is supported and a SMF+PGW-C is selected by the ePDG, policy interactions between PDN GW and PCRF specified in TS 23.402[ Architecture enhancements for non-3GPP accesses ]  [26] are replaced by equivalent interactions between SMF+PGW-C and PCF as captured in clause 4.11.0a.2. If SMF+PGW-C is selected and interaction with PCF is required for a UE that does not support 5GC NAS, the SMF+PGW-C determines the PDU Session ID and S-NSSAI in the same way as for PDN connection via MME as specified in clause 4.11.0a.5.