Feature Description

Applications like the IP Multimedia Subsystem (IMS) require an always-on Protocol Data Unit (PDU) session that the User Plane resource establishes for every transition from the 5GMM-IDLE mode to the 5GMM-CONNECTED mode. The UE requests the establishment of a PDU session as an always-on PDU session based on the request indication of the upper layers. It is the network that decides whether to establish a PDU session as an always-on PDU session.