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5G UDM Registration Guide

The document summarizes the interactions between a new AMF, old AMF, and UDM during a 5G standalone access registration. The new AMF authenticates with the UDM, registers with the UDM, and retrieves the subscriber data, SMF selection data, and UE context from the UDM. The UDM then notifies the old AMF that it is no longer serving the user.

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Bikash Dash
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148 views2 pages

5G UDM Registration Guide

The document summarizes the interactions between a new AMF, old AMF, and UDM during a 5G standalone access registration. The new AMF authenticates with the UDM, registers with the UDM, and retrieves the subscriber data, SMF selection data, and UE context from the UDM. The UDM then notifies the old AMF that it is no longer serving the user.

Uploaded by

Bikash Dash
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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5G Standalone Access Registration UDM.

pdf

5GC

New AMF Old AMF AUSF

UDM Interactions: 5G Standalone Access Registration


NAS Authentication and Security

UDM

1:Nudm_UEAuthenticate_Get Request Request authentication vectors from the UDM - Unified Data Management function.
SUCI: Subscription Concealed Identifier

2:Authentication Vector Generation UDM generates the authentication vectors for the session.

3:Nudm_UEAuthenticate_Get Response UDM returns authentication data.


Authentication method and data

Register with the UDM and obtain the subscription data

UDM

4:Nudm_UEContextManagement_Registration Request Since the AMF has changed, the New AMF registers with the UDM.
PUT,
Amf 3Gpp Access Registration = { AMF Instance Id, Supported Features, PEI, dereg Callback Uri, ...}

5:Nudm_UEContextManagement_Registration Response A response code of "204 No Content" signals registration success.


204 No Content

6:Nudm_SubscriberDataManagement_Get Request The AMF retrieves the Access and Mobility Subscription data.
GET,
Requested data = Access and Mobility Subscription data

7:Nudm_SubscriberDataManagement_Get Response UDM responds with the requested data.


Access and Mobility Subscription data = {Supported Features, GPSI array, Network Slice Selection
Info, ...}

8:Nudm_SubscriberDataManagement_Get Request The AMF retrieves the SMF Selection Subscription data.
GET,
Requested data = SMF Selection Subscription data

13-Feb-19 Generated with EventStudio System Designer - https://www.EventHelix.com/EventStudio/ 1


5G Standalone Access Registration UDM.pdf

5GC

New AMF Old AMF AUSF UDM

9:Nudm_SubscriberDataManagement_Get Response UDM responds with the requested data.


SMF Selection Subscription data = {Supported Features, List of S-NSSAIs and associated information}

10:Nudm_SubscriberDataManagement_Get Request The AMF retrieves the UE context in SMF data.


GET,
Requested data = UE context in SMF data

11:Nudm_SubscriberDataManagement_Get Response UDM responds with the requested data.


UE context in SMF data = {PDU Session Information, FQDNs for EPC Interworking}

12:Nudm_UEContextManagement_Deregistration_Notify The old AMF is notified that it is no longer serving the user. The UDM sends a POST request to
the callbackReference (deregCallbackUri field in Amf3GppAccessRegistration) as provided by
the Old AMF during the registration.

13-Feb-19 Generated with EventStudio System Designer - https://www.EventHelix.com/EventStudio/ 2

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