Update Policy Association
This section describes the call flow of th policy associations are updated.

Step |
Description |
---|---|
1 |
When AMF is relocated and the new AMF instance prefers to maintain the policy association, the AMF sends the Npcf_ AMPolicyControl_Update request to PCF. |
2 |
The PCF registers and subscribes to the triggers for the service area restriction changes and responds to AMF with the trigger details. |
3 |
In case of registration failure, PCF responds to AMF with an error indicating that the request is not completed and details of the issue that caused the failure. |