ETSI TS 124 502 V16.6.0 (2021-01)

5G; Access to the 3GPP 5G Core Network (5GCN) via non-3GPP access networks (3GPP TS 24.502 version 16.6.0 Release 16)

RTS/TSGC-0124502vg60

General Information

• Status: Not Published
• Technical Committee: 3GPP CT 1 - MM/CC/SM [lu] (formely CN1)
• Current Stage: 12 - Completion
• Completion Date: 14-Jan-2021

Standards Content (Sample)

ETSI TS 124 502 V16.6.0 (2021-01)






TECHNICAL SPECIFICATION
5G;
Access to the 3GPP 5G Core Network (5GCN)
via non-3GPP access networks
(3GPP TS 24.502 version 16.6.0 Release 16)

---------------------- Page: 1 ----------------------
3GPP TS 24.502 version 16.6.0 Release 16 1 ETSI TS 124 502 V16.6.0 (2021-01)



Reference
RTS/TSGC-0124502vg60
Keywords
5G

ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE

Tel.: [phone]  Fax: [phone]

Siret N° 348 623 562 00017 - NAF 742 C
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° 7803/88

Important notice
The present document can be downloaded from:
http://www.etsi.org/standards-search
The present document may be made available in electronic versions and/or in print. The content of any electronic and/or
print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any
existing or perceived difference in contents between such versions and/or in print, the prevailing version of an ETSI
deliverable is the one made publicly available in PDF format at www.etsi.org/deliver.
Users of the present document should be aware that the document may be subject to revision or change of status.
Information on the current status of this and other ETSI documents is available at
https://portal.etsi.org/TB/ETSIDeliverableStatus.aspx
If you find errors in the present document, please send your comment to one of the following services:
https://portal.etsi.org/People/CommiteeSupportStaff.aspx
Copyright Notification
No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying
and microfilm except as authorized by written permission of ETSI.
The content of the PDF version shall not be modified without the written authorization of ETSI.
The copyright and the foregoing restriction extend to reproduction in all media.

© ETSI 2021.
All rights reserved.

DECT™, PLUGTESTS™, UMTS™ and the ETSI logo are trademarks of ETSI registered for the benefit of its Members.

3GPP™ and LTE™ are trademarks of ETSI registered for the benefit of its Members and
of the 3GPP Organizational Partners.
oneM2M™ logo is a trademark of ETSI registered for the benefit of its Members and
of the oneM2M Partners.
®
GSM and the GSM logo are trademarks registered and owned by the GSM Association.
ETSI

---------------------- Page: 2 ----------------------
3GPP TS 24.502 version 16.6.0 Release 16 2 ETSI TS 124 502 V16.6.0 (2021-01)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (https://ipr.etsi.org/).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Trademarks
The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners.
ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no
right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does
not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks.
Legal Notice
This Technical Specification (TS) has been produced by ETSI 3rd Generation Partnership Project (3GPP).
The present document may refer to technical specifications or reports using their 3GPP identities. These shall be
interpreted as being references to the corresponding ETSI deliverables.
The cross reference between 3GPP and ETSI identities can be found under http://webapp.etsi.org/key/queryform.asp.
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
ETSI

---------------------- Page: 3 ----------------------
3GPP TS 24.502 version 16.6.0 Release 16 3 ETSI TS 124 502 V16.6.0 (2021-01)
Contents
Intellectual Property Rights . 2
Legal Notice . 2
Modal verbs terminology . 2
Foreword . 7
1 Scope . 8
2 References . 8
3 Definitions, symbols and abbreviations . 10
3.1 Definitions . 10
3.2 Abbreviations . 11
4 General . 12
4.1 Overview . 12
4.2 Untrusted access . 12
4.3 Identities . 12
4.3.1 User identities . 12
4.3.2 FQDN for N3IWF Selection . 12
4.4 Quality of service support . 13
4.4.1 General . 13
4.4.2 QoS differentiation in non-3GPP access . 13
4.4.2.1 General . 13
4.4.2.2 QoS signalling . 13
4.4.2.3 QoS differentiation in user plane . 14
4.4.2.4 Reflective QoS . 14
4.4.2.5 QoS enforcement . 14
4.5 Trusted access . 14
4.6 Forbidden PLMNs for non-3GPP access to 5GCN . 15
5 Network discovery and selection . 15
5.1 General . 15
5.2 Access network discovery procedure . 15
5.2.1 General . 15
5.2.2 Discovering availability of WLAN access networks . 16
5.3 Access network selection procedure. 16
5.3.1 General . 16
5.3.2 WLAN selection procedure . 16
5.3.2.1 General . 16
5.3.2.2 Manual mode WLAN selection. 16
5.3.2.3 Automatic mode WLAN selection . 16
5.3A PLMN selection procedures using trusted non-3GPP access . 18
5.3A.1 General . 18
5.3A.2 PLMN solicitation . 18
5.3A.3 Manual PLMN selection mode procedure . 19
5.3A.4 Automatic mode PLMN selection procedure . 19
5.3A.4.1 General . 19
5.3A.4.2 Attempting to select HPLMN or equivalent HPLMN . 20
5.3A.4.3 Void. 20
5.3B PLMN selection procedures using wireline access . 20
5.4 Access network reselection procedure . 21
5.4.1 General . 21
5.4.2 WLAN reselection procedure . 21
6 UE - 5GC network protocols . 21
6.1 General . 21
6.2 Void . 21
6.3 Authentication and authorization for accessing 5GS via non-3GPP access network . 21
ETSI

---------------------- Page: 4 ----------------------
3GPP TS 24.502 version 16.6.0 Release 16 4 ETSI TS 124 502 V16.6.0 (2021-01)
6.3.1 General . 21
6.3.2 Authentication of N5GC device behind a CRG over wireline access . 22
6.4 Handling of ANDSP Information . 22
6.4.1 General . 22
6.4.2 UE procedures . 23
6.4.2.1 General . 23
6.4.2.2 Use of WLAN selection information . 23
6.4.2.3 Use of N3AN node configuration information . 23
6.4.3 ANDSP information from the network . 23
7 Security association management procedures . 23
7.1 General . 23
7.2 N3AN node selection procedure . 24
7.2.1 General . 24
7.2.2 N3AN node configuration information . 24
7.2.3 Determination of the country the UE is located in . 24
7.2.4 N3AN node selection . 24
7.2.4.1 General . 24
7.2.4.2 Determine if the visited country mandates the selection of N3IWF in this country. 25
7.2.4.3 UE procedure when the UE only supports connectivity with N3IWF . 25
7.2.4.4 UE procedure when the UE supports connectivity with N3IWF and ePDG . 27
7.2.4.4.1 General . 27
7.2.4.4.2 N3AN node selection for IMS service . 28
7.2.4.4.3 N3AN node selection for Non-IMS service . 31
7.2.5 Selection of an N3AN node in an SNPN . 34
7.3 IKE SA establishment procedure for untrusted non-3GPP access . 34
7.3.1 General . 34
7.3.2 IKE SA and signalling IPsec SA establishment procedure . 35
7.3.2.1 IKE SA and signalling IPsec SA establishment initiation . 35
7.3.2.2 IKE SA and signalling IPsec SA establishment accepted by the network . 35
7.3.2.3 IKE SA and signalling IPsec SA establishment not accepted by the network . 37
7.3.3 EAP-5G session over non-3GPP access . 38
7.3.3.1 General . 38
7.3.3.1A EAP-5G session initiation . 38
7.3.3.2 EAP-5G session completion initiated by the network . 39
7.3.3.3 EAP-5G session completion initiated by the UE . 39
7.3.4 Abnormal cases in the UE . 40
7.3.5 Abnormal cases in the N3IWF . 40
7.3A IKE SA establishment procedure for trusted non-3GPP access . 40
7.3A.1 General . 40
7.3A.2 EAP session over non-3GPP access . 42
7.3A.2.1 General . 42
7.3A.2.2 Identity transaction . 42
7.3A.2.3 EAP-5G session initiation . 42
7.3A.2.4 EAP-5G session completion initiated by the network . 43
7.3A.2.5 EAP-5G session completion initiated by the UE . 43
7.3A.3 IKE SA and signalling IPsec SA establishment procedure . 43
7.3A.3.1 IKE SA and signalling IPsec SA establishment initiation . 43
7.3A.3.2 IKE SA and signalling IPsec SA establishment accepted by the network . 43
7.3A.3.3 IKE SA and signalling IPsec SA establishment not accepted by the network . 43
7.3A.4 Procedure for devices without NAS support . 43
7.3A.4.1 General . 43
7.3A.4.2 N5CW device registration over trusted WLAN access network . 44
7.4 IKEv2 SA deletion procedure . 44
7.4.1 General . 44
7.4.2 IKE SA deletion procedure initiated by the N3IWF and the TNGF . 45
7.4.2.1 IKE SA deletion initiation . 45
7.4.2.2 IKE SA deletion accepted by the UE . 45
7.4.2.3 Abnormal cases in the N3IWF and the TNGF . 45
7.4.3 IKE SA deletion procedure initiated by the UE . 46
7.4.3.1 IKE SA deletion initiation . 46
7.4.3.2 IKE SA deletion accepted by the N3IWF and the TNGF . 46
ETSI

---------------------- Page: 5 ----------------------
3GPP TS 24.502 version 16.6.0 Release 16 5 ETSI TS 124 502 V16.6.0 (2021-01)
7.4.3.3 Abnormal cases in the UE . 46
7.5 User plane IPsec SA creation procedure . 46
7.5.1 General . 46
7.5.2 Child SA creation procedure initiation . 47
7.5.3 Child SA creation procedure accepted by the UE . 47
7.5.4 Child SA creation procedure not accepted by the UE . 47
7.5.5 Abnormal cases in the UE . 48
7.5.6 Abnormal cases in the N3IWF and the TNGF . 48
7.6 IPsec SA modification procedure . 48
7.6.1 General . 48
7.6.2 N3IWF and TNGF procedure for IPsec child SA modification . 48
7.6.3 UE procedure for IPsec child SA modification. 48
7.7 IPSec SA deletion procedure . 49
7.7.1 General . 49
7.7.2 N3IWF-initated and TNGF-initiated child SA deletion procedure . 49
7.7.2.1 N3IWF-initiated and TNGF-initiated child SA deletion procedure initiation . 49
7.7.2.2 N3IWF-initiated and TNGF-initiated child SA deletion procedure accepted by the UE . 49
7.7.2.3 Abnormal cases in the N3IWF and the TNGF . 49
7.7.3 UE-initiated child SA deletion procedure . 50
7.7.3.1 UE-initiated child SA deletion procedure initiation . 50
7.7.3.2 UE-initiated child SA deletion procedure accepted by the N3IWF and the TNGF. 50
7.7.3.3 Abnormal cases in the UE . 50
7.7.4 Abnormal cases in the UE . 50
7.7.5 Abnormal cases in the N3IWF and the TNGF . 50
7.8 UE-initiated liveness check procedure . 50
7.8.1 General . 50
7.8.2 UE-initiated liveness check procedure initiation . 50
7.8.3 UE-initiated liveness check procedure completion . 51
7.8.4 Abnormal cases . 51
7.9 Network-initiated liveness check procedure . 51
7.9.1 General . 51
7.9.2 Network-initiated liveness check procedure initiation . 51
7.9.3 Network-initiated liveness check procedure completion . 51
7.9.4 Abnormal cases . 51
7.10 IKE SA rekeying procedure . 52
7.10.1 General . 52
7.10.2 N3IWF-initiated and TNGF-initiated IKE SA rekeying procedure . 52
7.10.2.1 N3IWF-initiated and TNGF-initiated IKE SA rekeying procedure initiation . 52
7.10.2.2 N3IWF-initiated and TNGF-initiated IKE SA rekeying procedure completion . 52
7.10.2.3 Abnormal cases . 52
7.10.3 UE-initiated IKE SA rekeying procedure . 52
7.10.3.1 UE-initiated IKE SA rekeying procedure initiation . 52
7.10.3.2 UE-initiated IKE SA rekeying procedure completion . 53
7.10.3.3 Abnormal cases . 53
7.11 IPsec SA rekeying procedure . 53
7.11.1 General . 53
7.11.2 N3IWF-initiated and TNGF-initiated IPsec SA rekeying procedure . 53
7.11.2.1 N3IWF-initiated and TNGF-initiated IPsec SA rekeying procedure initiation . 53
7.11.2.2 N3IWF-initiated and TNGF-initiated IPsec SA rekeying procedure completion . 53
7.11.2.3 Abnormal cases .
...