Section: 4.4.1.4 N4 Session Release procedure
Content: The N4 session release procedure is used to remove the N4 session context of an existing PDU Session at the UPF. Figure 4.4.1.4-1 N4 Session Release procedure 1. SMF receives the trigger to remove the N4 session context for the PDU Session. 2. The SMF sends an N4 session release request message to the UPF. 3. The UPF identifies the N4 session context to be removed by the N4 Session ID and removes the whole session context. The UPF responds with an N4 session release response message containing any information that the UPF has to provide to the SMF. 4. The SMF interacts with the network entity which triggered this procedure (e.g. AMF or PCF).