In 5G (NR), AMF units do not need to be interrupted or restarted when making configuration changes or updates; they only need to notify the relevant network units. For mobile terminals (UEs) within their coverage area, the changes will be notified via the gNB in the radio network, and the AMF will determine whether the UE needs to re-register with the AMF. The update definition process is as follows:
I. Configuration Update Process: As shown in Figure (1), the AMF determines whether the UE needs to reconfigure or register with the AMF based on the changes. That is, when the AMF detects a change in the configuration previously sent to the UE, it will initiate the configuration update process. In response to the UE's confirmation request, the AMF will send configuration update completion information to the AMF.
Figure 1. AMF Configuration Update Notification Flowchart
II. AMF Configuration Update Interface (Message)
[12] Construct Downlink RAN Configuration Transmission
[13] Send Downlink RAN Configuration Transmission
[12] Construct Downlink RAN Status Transmission
[13] Send Downlink RAN Status Transmission
[12] RAN Configuration Update Failed
[13] Send RAN Configuration Update Failed
[12] RAN Configuration Update Confirmation
[13] Send RAN Configuration Update Confirmation
[7] Construct Configuration Update Command
[8] Send Configuration Update Command
[12] Construct Downlink UE-Associated NRPPA Transmission
[13] Send Downlink UE-Associated NRPPA Transmission
[12] Construct Downlink Non-UE-Associated NRPPA Transmission
[13] Send Downlink Non-E-Associated NRPPA Transmission
[9] Configuration Update Complete
[12] Construct AMF Configuration Update
[13] Send AMF Configuration Update
