Section: 4.5.2 Session Management Subscriber Data Update Notification to SMF
Content: Whenever the session management subscriber data is changed for a user in the UDM/UDR and if the SMF subscribed for the update of the session management subscriber data to be notified, the UDM shall notify these changes to the affected SMF by the means of invoking Nudm_SDM_Notification service operation. Then the SMF modifies the session management subscriber data in the UE SM context. The Nudm_SDM_Notification service operation specified in clause 5.2.3.3 is used by the UDM to update session management subscriber data stored in the SMF. The SMF initiates appropriate action according to the changed subscriber data, e.g. including: - initiating an SMF initiated PDU Session Modification procedure; or - initiating an SMF initiated PDU Session Release procedure.