N7 Interface
The N7 interface is the reference point between the SMF and the Policy Control Function (PCF) during session establishment or modification.
PCF uses the policy control for session management. This network function implements N7 interface to trigger session management policies towards SMF. SMF controls the User plane Function (UPF) and translates policies that it receives from PCF to the information that the UPF understands and then forwards it to the UPF.