PFCP Session Deletion Procedure
The PFCP Session Deletion procedure deletes an existing PFCP session between the SMF and UPF. The SMF initiates a PFCP Session Deletion procedure toward the UPF to delete an existing PFCP session. The UPF sends the Session Deletion Response including the Usage Report for all URRs provisioned earlier.
The following call flow depicts the PFCP Session Deletion procedure.
Step | Description |
---|---|
1 | The SMF receives the trigger to remove the PFCP session context for the PDU Session. |
2 | It sends the PFCP Session Delete Request message to the UPF. |
3 | The UPF identifies the PFCP session context for the Session ID to remove. It then removes the whole session context. In addition, the UPF responds with a PFCP Session Delete Response message that contains any information the UPF provides to the SMF. For instance, the UPF sends usage report for all the URR provisioned for this session. |
4 | The SMF interacts with the network function, which triggered this procedure. For instance, AMF or PCF. |