N9 Home Routed Roaming Call Flow

This section describes the N9 Home Routed Roaming call flow.

N9 Home Routed Roaming Call Flow
N9 Home Routed Roaming Call Flow Description

Step

Description

1

The UE sends the Create PDN Request to AMF.

2, 3a, 3b

AMF performs the SMF selection and sends Nsmf_PDUSession_CreateSMContext_Request to vSMF and receives response.

4

vUPF performs the UPF selection.

5a, 5b

vSMF sends the N4 Session Establishment Request to vUPF and receives a response from it.

6

vSMF sends Nsmf_PDUSession_Create_Request to the hSMF.

7

Registration or subscription data retrieval is performed.

8

PDU session Authentication or Authorization procedure is performed.

9-13

See 3GPP TS 23502, version 15.4.0, section 4.3.2.2.2.

14

vSMF sends Namf_communication_N1N2MessageTransfer to SMF.

15, 16

AMF sends N2 PDU Session Request to RAN and receives a response.

17, 18

AMF sends Nsmf_PDUSession_updateSMContext_Request to vSMF and receives a response.