N4 Session Delete Call Flow

N4 Session Delete is used to remove the N4 session context of an existing PDU session at the UPF.

StepDescription
1SMF receives the trigger to remove the N4 session context for the PDU session.
2SMF sends an N4 session delete request message to the UPF.
3UPF identifies the N4 session context to be removed by the N4 Session ID and removes the whole session context. UPF responds with an N4 session delete response message containing any information that the UPF has to provide to the SMF.
4SMF interacts with the network entity which triggered this procedure. For example, AMF or PCF.