Inter AMF (N2_Idle) Scenario Call Flow

This section describes the Inter-AMF (N2_Idle) Scenario call flow.

Inter AMF (N2_Idle) Scenario Call Flow
Inter AMF (N2_Idle) Scenario Call Flow Description

Step

Description

1

The UE sends a Registration Request with the registration type set to initial or mobility.

2

The New AMF sends the Post../ue-contexts/{ueContextId}/ request to the Old AMF.

When the New AMF gets the UE context from the Old AMF, the AMF derives the emergency registration which is based on the following parameters:

  • supiunauthInd is present

  • if only IMEI is present and the UE is in the same PLMN.

3

The Old AMF sends the 200 OK message to the New AMF.

4

The New AMF sends the Post../ue-contexts/{ueContexts}/{ueContextId}/transfer-update request to the Old AMF.

5

The Old AMF sends the 200 OK message to the New AMF.

6

The New AMF sends the POST../sm-contexts/{smContextRef}/update to the SMF.

7

The SMF sends the 204/400/500 to the New AMF.

From the Registration Accept message onwards, the call flow is the same as Initial Registration Request except for UDM, PCF, and AUSF. For further information on Initial Registration Request, see Registration with AMF Change Call Flow in the chapter Internode Registration Support in this document.