ETSI TS 129 413 V17.5.0 (2025-03)

5G; Application of the NG Application Protocol (NGAP) to non-3GPP access (3GPP TS 29.413 version 17.5.0 Release 17)

RTS/TSGR-0329413vh50

General Information

• Status: Not Published
• Technical Committee: 3GPP RAN 3 - lub specification, lur specification, lu specification and UTRAN & O&M
• Current Stage: 12 - Citation in the OJ (auto-insert)
• Completion Date: 27-Mar-2025

Standards Content (Sample)

TECHNICAL SPECIFICATION
5G;
Application of the NG Application Protocol (NGAP)
to non-3GPP access
(3GPP TS 29.413 version 17.5.0 Release 17)

3GPP TS 29.413 version 17.5.0 Release 17 1 ETSI TS 129 413 V17.5.0 (2025-03)

Reference
RTS/TSGR-0329413vh50
Keywords
5G
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3GPP TS 29.413 version 17.5.0 Release 17 2 ETSI TS 129 413 V17.5.0 (2025-03)
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3GPP TS 29.413 version 17.5.0 Release 17 3 ETSI TS 129 413 V17.5.0 (2025-03)
Contents
Intellectual Property Rights . 2
Legal Notice . 2
Modal verbs terminology . 2
Foreword . 4
1 Scope . 5
2 References . 5
3 Abbreviations . 5
4 Principles for the use of NGAP for non-3GPP access . 5
4.1 General . 5
5 Non-3GPP access . 6
5.1 Use of the NGAP for non-3GPP access . 6
5.2 NGAP messages used for non-3GPP access . 7
5.3 Exceptions for NGAP message contents and information element coding when used for non-3GPP

access . 8
5.4 Handling of NGAP messages not specified to be applicable between the Non-3GPP access network
node and AMF . 13
Annex A (informative): Change history . 14
History . 15

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3GPP TS 29.413 version 17.5.0 Release 17 4 ETSI TS 129 413 V17.5.0 (2025-03)
Foreword
This Technical Specification has been produced by the 3rd Generation Partnership Project (3GPP).
The contents of the present document are subject to continuing work within the TSG and may change following formal
TSG approval. Should the TSG modify the contents of the present document, it will be re-released by the TSG with an
identifying change of release date and an increase in version number as follows:
Version x.y.z
where:
x the first digit:
1 presented to TSG for information;
2 presented to TSG for approval;
3 or greater indicates TSG approved document under change control.
y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections,
updates, etc.
z the third digit is incremented when editorial only changes have been incorporated in the document.
ETSI
3GPP TS 29.413 version 17.5.0 Release 17 5 ETSI TS 129 413 V17.5.0 (2025-03)
1 Scope
The present document describes the applicability of NG Application Protocol (NGAP) messages and procedures,
defined in 3GPP TS 38.413 [2], to non-3GPP access. A general description for non-3GPP access can be found in 3GPP
TS 23.501 [3], 3GPP TS 23.502 [4], and 3GPP TS 23.316 [6].
2 References
The following documents contain provisions which, through reference in this text, constitute provisions of the present
document.
- References are either specific (identified by date of publication, edition number, version number, etc.) or
non-specific.
- For a specific reference, subsequent revisions do not apply.
- For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including
a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same
Release as the present document.
[1] 3GPP TR 21.905: "Vocabulary for 3GPP Specifications".
[2] 3GPP TS 38.413: "NG-RAN; NG Application Protocol (NGAP)".
[3] 3GPP TS 23.501: "System Architecture for the 5G System".
[4] 3GPP TS 23.502: "Procedures for the 5G System".
[5] 3GPP TS 33.501: "Security architecture and procedures for 5G system".
[6] 3GPP TS 23.316: "Wireless and wireline convergence access support for the 5G System (5GS)".
[7] 3GPP TS 24.502: "Access to the 3GPP 5G Core Network (5GCN) via Non-3GPP Access
Networks (N3AN)".
3 Abbreviations
For the purposes of the present document, the abbreviations given in 3GPP TR 21.905 [1] and the following apply. An
abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in
3GPP TR 21.905 [1].
5G-RG 5G Residential Gateway
FN-RG Fixed Network Residential Gateway
N3IWF Non-3GPP InterWorking Function
TNAP Trusted Non-3GPP Access Point
TNGF Trusted Non-3GPP Gateway Function
TWIF Trusted WLAN Interworking Function
W-AGF Wireline Access Gateway Function
4 Principles for the use of NGAP for non-3GPP access
4.1 General
TS 23.501 [3] specifies the NGAP used between the Non-3GPP access network node and the AMF. The Non-3GPP
access network node is either a Non-3GPP InterWorking Function (N3IWF), or a Trusted Non-3GPP Gateway Function
(TNGF), or a Trusted WLAN Interworking Function (TWIF), or a Wireline Access Gateway Function (W-AGF).
NGAP is used as specified in TS 38.413 [2] with clarifications or additions as specified in Clause 5.
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5 Non-3GPP access
5.1 Use of the NGAP for non-3GPP access
The following NGAP procedures are used between the Non-3GPP access network node and the AMF:
- PDU Session Management Procedures
- PDU Session Resource Setup
- PDU Session Resource Release
- PDU Session Resource Modify
- PDU Session Resource Notify
- UE Context Management Procedures
- Initial Context Setup
- UE Context Release Request
- UE Context Release
- UE Context Modification
- Transport of NAS Messages Procedures
- Initial UE Message
- Downlink NAS Transport
- Uplink NAS Transport
- NAS Non Delivery Indication
- Reroute NAS Request
- Interface Management Procedures
- NG Setup
- RAN Configuration Update
- AMF Configuration Update
- NG Reset
- Error Indication
- AMF Status Indication
- Overload Start
- Overload Stop
- UE TNLA Binding Procedures
- UE TNLA Binding Release
The following NGAP procedures are used between the N3IWF node and the AMF:
- Trace Procedures
- Trace Start
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- Trace Failure Indication
- Deactivate Trace
For the NGAP procedures used between the Non-3GPP access network node and the AMF, the Non-3GPP access
network node fulfils the behaviour of the NG-RAN node as specified in clause 8 of TS 38.413 [2], with clarifications as
specified in Clause 5.3. The text in clause 8 of TS 38.413 [2] referring to Uu should be understood as referring to the
Y2 reference point as specified in TS 23.501 [3].
5.2 NGAP messages used for non-3GPP access
The list given below shows the NGAP messages, as specified in TS 38.413 [2] subclause 9.2 (tabular format) and 9.4
(ASN.1 notation) that
...