SM Policy Subscription
This section describes the call flow of the SM policy association establishment procedure.

Step |
Description |
---|---|
1 |
The SMF sends a Npcf_SmPolicyControl_Create request to the PCF. |
2 |
If the UDR URL is not configured, the PCF sends the Nnrf_NFDiscovery request to NRF. |
3 |
In response, the NRF sends the Nnrf_NFDiscovery results to the PCF. |
4 |
The PCF sends the Nudr_DataRespository query to the UDR. |
5 |
In response, the UDR sends the repository details to the PCF. |
6 |
The PCF sends the Npcf_SmPolicyControl_Create request to the SMF. |
7 |
The PCF sends the Nudr_DataRepository query to the UDR. |
8 |
The UDR responds to PCF with the repository information. |
9 |
After PCF evaluates the response, if the policy has modified, then the PCF sends the Npcf_SmPolicyControl_UpdateNotify request to the SMF. |
10 |
The SMF sends the Update Notification as a response to the PCF. |