S Registration Complete message. 5G SA network design fundamentals 44. The NAS Registration Complete message is then transported to the AMF via the gNB: UE Performs Registration: UE Policy Delivery (5 of 5) AM PCF UE Policy Association Create UE Policy Status Data Repository Query (SUPI, UE Policies) Ack (UE Policy Data) Data Repository Subscribe (SUPI, UE Policy Data Changes) Subscription Ack UE Policy Association Ack (Policy Request Triggers) N1N2 Msg Xfer Subscribe (UE Policy Msg Delivery) NIN2 Msg Xfer UE Policy DL NAS Transport NAS: UE Policy DL Info Transport UL Info Tansport UL NAS Xport NAS: Result N1 Msg Notify Data Repository Query (SUPI, UE Policy Data) Figure 11.8 - UE registration - part 5: UE policy delivery 45. The AMF then sends a UE Policy Association Create message to the AM PCF. This sequence is very similar to the AM Policy association sequence noted previously. 46. The AM PCF then sends the Data Repository Query to the UDR. 5G Standalone Networks 47. The UDR responds with the UE policy data. 48. The AM PCF then sends a Data Repository Subscribe request to the UDR SO that it can be notified of any changes in policy in the UDR. 49. The UDR acknowledges the subscription request. The AM PCF then sends the UE policy Association Acknowledgement message to the AMF with the policy request triggers. 51. The PCF, in turn, sends an N1N2 message transfer subscribe message to the AMF to ensure that it is notified of UE policy message delivery. 52. The AMF acknowledges this. 53. The PCF sends the N1N2 message transfer message to the PCF with the UE policy. 54. The AMF sends an acknowledgment. 55. The AMF then sends the DL NAS transport message to the gNB to transfer the NAS message carrying the UE policy to the UE. 56. The NAS message is delivered to the UE with the UE policy. 57. The UE sends its response to the AMF in a NAS message, which is transported by the gNB. 58. The NAS message is delivered to the AMF. 59. The AMF sends a Notify message to PCF to convey the successful completion of the UE procedur