SOR After the UE Registration Call Flow

This section describes the SOR after the UE Registration call flow.

SOR After the UE Registration Call Flow
SOR After the UE Registration Call Flow Description

Step

Description

1

UDM notifies the changes of the user profile using Nudm_SDM_Notification service operation to the affected AMF. The following are the substeps:

  • The Nudm_SDM_Notification service operation contains the SOR which must be delivered to the UE over NAS in the Access and Mobility Subscription data.

  • When the HPLMN decides the following:

    • The UE must ACK the successful security check of the received SOR, including the Nudm_SDM_Notification service operation.

    • It contains an indication which represents UDM requests as an ACK from the UE as part of the SOR.

2

The AMF sends DL NAS TRANSPORT to the served UE.

The AMF includes the SOR information as received from the UDM in DL NAS TRANSPORT.

3

The SOR security check procedure takes place at UE.

4

UE sends UL NAS TRANSPORT to the serving AMF with an SOR:

  • When the UDM requested an ACK from the UE in the DL NAS TRANSPORT message.

  • When the security check-in at Step 2 is successful.

5

If UL NAS TRANSPORT with an SOR transparent container is received, the AMF uses the Nudm_SDM_Info service operation to forward the received SOR to the UDM.

If the HPLMN decides the following:

  • The UE must ACK the successful security check for the received list of preferred PLMN or access technology combinations from Step 1.

  • The UDM verifies the ACK provided by UE.