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TECHNICAL SPECIFICATION
5G;
Access to the 3GPP 5G Core Network (5GCN)
via non-3GPP access networks
(3GPP TS 24.502 version 15.1.1 Release 15)
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3GPP TS 24.502 version 15.1.1 Release 15 1 ETSI TS 124 502 V15.1.1 (2018-10)
Reference
RTS/TSGC-0124502vf11
Keywords
5G
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3GPP TS 24.502 version 15.1.1 Release 15 2 ETSI TS 124 502 V15.1.1 (2018-10)
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
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Foreword
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, UMTS identities or
GSM identities. These should be interpreted as being references to the corresponding ETSI deliverables.
The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found under
.
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
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3GPP TS 24.502 version 15.1.1 Release 15 3 ETSI TS 124 502 V15.1.1 (2018-10)
Contents
Intellectual Property Rights . 2
Foreword . 2
Modal verbs terminology . 2
Foreword . 6
1 Scope . 7
2 References . 7
3 Definitions, symbols and abbreviations . 8
3.1 Definitions . 8
3.2 Abbreviations . 8
4 General . 9
4.1 Overview . 9
4.2 Untrusted access . 9
4.3 Identities . 9
4.3.1 User identities . 9
4.3.2 FQDN for N3IWF Selection . 9
4.4 Quality of service support . 10
4.4.1 General . 10
4.4.2 QoS differentiation in untrusted non-3GPP access . 10
4.4.2.1 General . 10
4.4.2.2 QoS signalling . 10
4.4.2.3 QoS differentiation in user plane . 10
4.4.2.4 Reflective QoS . 10
4.4.2.5 QoS enforcement . 10
5 Network discovery and selection . 10
5.1 General . 10
5.2 Access network discovery procedure . 11
5.2.1 General . 11
5.2.2 Discovering availability of WLAN access networks . 11
5.3 Access network selection procedure. 11
5.3.1 General . 11
5.3.2 WLAN selection procedure . 11
5.3.2.1 General . 11
5.3.2.2 Manual mode WLAN selection. 11
5.3.2.3 Automatic mode WLAN selection . 12
5.4 Access network reselection procedure . 12
5.4.1 General . 12
5.4.2 WLAN reselection procedure . 13
6 UE - 5GC network protocols . 13
6.1 General . 13
6.2 Untrusted Accesses. 13
6.3 Authentication and authorization for accessing 5GS via an untrusted non-3GPP access network . 13
6.3.1 General . 13
6.4 Handling of ANDSP Information . 13
6.4.1 General . 13
6.4.2 UE procedures . 14
6.4.2.1 General . 14
6.4.2.2 Use of WLAN selection information . 14
6.8.2.3 Use of N3AN node configuration information . 14
6.4.3 ANDSP information from the network . 14
7 Security association management procedures . 14
7.1 General . 14
7.2 N3AN node selection procedure . 14
ETSI
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3GPP TS 24.502 version 15.1.1 Release 15 4 ETSI TS 124 502 V15.1.1 (2018-10)
7.2.1 General . 14
7.2.2 N3AN node configuration information . 15
7.2.3 Determination of the country the UE is located in . 15
7.2.4 N3AN node selection . 15
7.2.4.1 General . 15
7.2.4.2 Determine if the visited country mandates the selection of N3IWF in this country. 15
7.2.4.3 UE procedure when the UE only supports connectivity with N3IWF . 16
7.2.4.4 UE procedure when the UE supports connectivity with N3IWF and ePDG . 18
7.2.4.4.1 General . 18
7.2.4.4.2 N3AN node selection for IMS service . 18
7.2.4.4.3 N3AN node selection for Non-IMS service . 21
7.3 IKE SA establishment procedure . 23
7.3.1 General . 23
7.3.2 IKE SA and signalling IPsec SA establishment procedure . 24
7.3.2.1 IKE SA and signalling IPsec SA establishment initiation . 24
7.3.2.2 IKE SA and signalling IPsec SA establishment accepted by the network . 24
7.3.2.3 IKE SA and signalling IPsec SA establishment not accepted by the network . 26
7.3.3 EAP-5G session over non-3GPP access . 26
7.3.3.1 General . 26
7.3.3.2 EAP-5G session completion initiated by the network . 27
7.3.3.3 EAP-5G session completion initiated by the UE . 27
7.3.4 Abnormal cases in the UE . 28
7.3.5 Abnormal cases in the N3IWF . 28
7.4 IKEv2 SA deletion procedure . 28
7.4.1 General . 28
7.4.2 IKE SA deletion procedure initiated by the N3IWF . 28
7.4.2.1 IKE SA deletion initiation . 28
7.4.2.2 IKE SA deletion accepted by the UE . 29
7.4.3 Abnormal cases in the UE . 29
7.4.4 Abnormal cases in the N3IWF . 29
7.5 User plane IPsec SA creation procedure . 29
7.5.1 General . 29
7.5.2 Child SA creation procedure initiation . 29
7.5.3 Child SA creation procedure accepted by the UE . 29
7.5.4 Child SA creation procedure not accepted by the UE . 30
7.5.5 Abnormal cases in the UE . 30
7.5.6 Abnormal cases in the N3IWF . 30
7.6 IPSec SA modification procedure . 30
7.7 IPSec SA deletion procedure . 30
7.7.1 General . 30
7.7.2 Child SA deletion procedure initiation . 30
7.7.3 Child SA deletion procedure accepted by the UE . 30
7.7.4 Abnormal cases in the UE . 31
7.7.5 Abnormal cases in the N3IWF . 31
7.8 UE-initiated liveness check procedure . 31
7.8.1 General . 31
7.8.2 UE-initiated liveness check procedure initiation . 31
7.8.3 UE-initiated liveness check procedure completion . 31
7.8.4 Abnormal cases . 31
7.9 Network-initiated liveness check procedure . 32
7.9.1 General . 32
7.9.2 Network-initiated liveness check procedure initiation . 32
7.9.3 Network-initiated liveness check procedure completion . 32
7.9.4 Abnormal cases . 32
8 Message Transport procedures . 32
8.1 General . 32
8.2 Transport of NAS messages over control plane . 32
8.2.1 General . 32
8.2.2 ESP encapsulation . 32
8.3 Transport of messages over user plane . 34
8.3.1 General . 34
ETSI
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3GPP TS 24.502 version 15.1.1 Release 15 5 ETSI TS 124 502 V15.1.1 (2018-10)
8.3.2 GRE encapsulation . 34
9 Parameters and coding. 35
9.1 General . 35
9.2 3GPP specific coding information . 35
9.2.1 GUAMI . 35
9.2.2 Establishment cause for non-3GPP access . 36
9.2.3 PLMN ID . 36
9.2.4 IKEv2 Notify Message Type value . 37
9.2.4.1 General . 37
9.2.4.2 Private Notify Message - Error Types . 37
9.2.4.3 Private Notify Message - Status Types . 38
9.3 IETF RFC coding information . 39
9.3.1 IKEv2 Notify payloads . 39
9.3.1.1 5G_QOS_INFO Notify payload. 39
9.3.1.2 NAS_IP4_ADDRESS Notify payload . 39
9.3.1.3 NAS_IP6_ADDRESS Notify payload . 40
9.3.1.4 UP_IP4_ADDRESS Notify payload . 40
9.3.1.5 UP_IP6_ADDRESS Notify payload . 41
9.3.2 EAP-5G method . 42
9.3.2.1 General . 42
9.3.2.2 Message format . 42
9.3.2.2.1 EAP-Request/5G-Start message . 42
9.3.2.2.2 EAP-Response/5G-NAS message . 42
9.3.2.2.3 EAP-Request/5G-NAS message . 45
9.3.2.2.3 EAP-Request/5G-Stop message . 45
9.3.3 GRE encapsulated user data packet . 46
Annex A (informative): Change history . 48
History . 50
ETSI
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3GPP TS 24.502 version 15.1.1 Release 15 6 ETSI TS 124 502 V15.1.1 (2018-10)
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
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3GPP TS 24.502 version 15.1.1 Release 15 7 ETSI TS 124 502 V15.1.1 (2018-10)
1 Scope
The present document specifies non-3GPP access network discovery and selection procedures, the access authorization
procedure used for accessing untrusted non-3GPP access networks.
The present document also specifies the security association management procedures used for establishing IKEv2 and
IPsec security associations between the UE and the N3IWF and the procedures for transporting messages between the
UE and the N3IWF over the non-3GPP access networks.
The present document is applicable to the UE and the network. In this technical specification the network refers to the
3GPP 5GCN and the untrusted non-3GPP access network.
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 23.501: "System Architecture for the 5G System; Stage 2".
[3] 3GPP TS 23.502: "Procedures for the 5G System; Stage 2".
[4] 3GPP TS 24.501: "Access-Stratum (NAS) protocol for 5G System (5GS); Stage 3".
[5] 3GPP TS 33.501: "Security architecture and procedures for 5G System".
[6] IETF RFC 7296: "Internet Key Exchange Protocol Version 2 (IKEv2)".
[7] 3GPP TS 24.302: "Access
...