ETSI TS 124 502 V15.5.0 (2019-10)

5G; Access to the 3GPP 5G Core Network (5GCN) via non-3GPP access networks (3GPP TS 24.502 version 15.5.0 Release 15)

RTS/TSGC-0124502vf50

General Information

• Status: Published
• Publication Date: 30-Sep-2019
• Technical Committee: 3GPP CT 1 - MM/CC/SM [lu] (formely CN1)
• Current Stage: 12 - Completion
• Completion Date: 01-Oct-2019

Standards Content (Sample)

ETSI TS 124 502 V15.5.0 (2019-10)






TECHNICAL SPECIFICATION
5G;
Access to the 3GPP 5G Core Network (5GCN) via non-3GPP
access networks
(3GPP TS 24.502 version 15.5.0 Release 15)

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3GPP TS 24.502 version 15.5.0 Release 15 1 ETSI TS 124 502 V15.5.0 (2019-10)



Reference
RTS/TSGC-0124502vf50
Keywords
5G

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3GPP TS 24.502 version 15.5.0 Release 15 2 ETSI TS 124 502 V15.5.0 (2019-10)
Intellectual Property Rights
Essential patents
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pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
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Legal Notice
This Technical Specification (TS) has been produced by ETSI 3rd Generation Partnership Project (3GPP).
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Modal verbs terminology
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"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 15.5.0 Release 15 3 ETSI TS 124 502 V15.5.0 (2019-10)
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 . 9
3.1 Definitions . 9
3.2 Abbreviations . 10
4 General . 10
4.1 Overview . 10
4.2 Untrusted access . 10
4.3 Identities . 11
4.3.1 User identities . 11
4.3.2 FQDN for N3IWF Selection . 11
4.4 Quality of service support . 11
4.4.1 General . 11
4.4.2 QoS differentiation in untrusted non-3GPP access . 11
4.4.2.1 General . 11
4.4.2.2 QoS signalling . 11
4.4.2.3 QoS differentiation in user plane . 12
4.4.2.4 Reflective QoS . 12
4.4.2.5 QoS enforcement . 12
5 Network discovery and selection . 12
5.1 General . 12
5.2 Access network discovery procedure . 12
5.2.1 General . 12
5.2.2 Discovering availability of WLAN access networks . 12
5.3 Access network selection procedure. 13
5.3.1 General . 13
5.3.2 WLAN selection procedure . 13
5.3.2.1 General . 13
5.3.2.2 Manual mode WLAN selection. 13
5.3.2.3 Automatic mode WLAN selection . 13
5.4 Access network reselection procedure . 14
5.4.1 General . 14
5.4.2 WLAN reselection procedure . 14
6 UE - 5GC network protocols . 15
6.1 General . 15
6.2 Untrusted Accesses. 15
6.3 Authentication and authorization for accessing 5GS via an untrusted non-3GPP access network . 15
6.3.1 General . 15
6.4 Handling of ANDSP Information . 15
6.4.1 General . 15
6.4.2 UE procedures . 16
6.4.2.1 General . 16
6.4.2.2 Use of WLAN selection information . 16
6.4.2.3 Use of N3AN node configuration information . 16
6.4.3 ANDSP information from the network . 16
7 Security association management procedures . 16
7.1 General . 16
7.2 N3AN node selection procedure . 17
ETSI

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3GPP TS 24.502 version 15.5.0 Release 15 4 ETSI TS 124 502 V15.5.0 (2019-10)
7.2.1 General . 17
7.2.2 N3AN node configuration information . 17
7.2.3 Determination of the country the UE is located in . 17
7.2.4 N3AN node selection . 17
7.2.4.1 General . 17
7.2.4.2 Determine if the visited country mandates the selection of N3IWF in this country. 18
7.2.4.3 UE procedure when the UE only supports connectivity with N3IWF . 18
7.2.4.4 UE procedure when the UE supports connectivity with N3IWF and ePDG . 20
7.2.4.4.1 General . 20
7.2.4.4.2 N3AN node selection for IMS service . 20
7.2.4.4.3 N3AN node selection for Non-IMS service . 23
7.3 IKE SA establishment procedure . 26
7.3.1 General . 26
7.3.2 IKE SA and signalling IPsec SA establishment procedure . 26
7.3.2.1 IKE SA and signalling IPsec SA establishment initiation . 26
7.3.2.2 IKE SA and signalling IPsec SA establishment accepted by the network . 26
7.3.2.3 IKE SA and signalling IPsec SA establishment not accepted by the network . 28
7.3.3 EAP-5G session over non-3GPP access . 29
7.3.3.1 General . 29
7.3.3.2 EAP-5G session completion initiated by the network . 30
7.3.3.3 EAP-5G session completion initiated by the UE . 30
7.3.4 Abnormal cases in the UE . 31
7.3.5 Abnormal cases in the N3IWF . 31
7.4 IKEv2 SA deletion procedure . 31
7.4.1 General . 31
7.4.2 IKE SA deletion procedure initiated by the N3IWF . 32
7.4.2.1 IKE SA deletion initiation . 32
7.4.2.2 IKE SA deletion accepted by the UE . 32
7.4.2.3 Abnormal cases in the N3IWF . 32
7.4.3 IKE SA deletion procedure initiated by the UE . 32
7.4.3.1 IKE SA deletion initiation . 32
7.4.3.2 IKE SA deletion accepted by the N3IWF . 32
7.4.3.3 Abnormal cases in the UE . 33
7.5 User plane IPsec SA creation procedure . 33
7.5.1 General . 33
7.5.2 Child SA creation procedure initiation . 33
7.5.3 Child SA creation procedure accepted by the UE . 33
7.5.4 Child SA creation procedure not accepted by the UE . 33
7.5.5 Abnormal cases in the UE . 34
7.5.6 Abnormal cases in the N3IWF . 34
7.6 IPsec SA modification procedure . 34
7.6.1 General . 34
7.6.2 N3IWF procedure for IPsec child SA modification . 34
7.6.3 UE procedure for IPsec child SA modification. 34
7.7 IPSec SA deletion procedure . 35
7.7.1 General . 35
7.7.2 N3IWF-initated child SA deletion procedure . 35
7.7.2.1 N3IWF-initiated child SA deletion procedure initiation . 35
7.7.2.2 N3IWF-initiated child SA deletion procedure accepted by the UE . 35
7.7.2.3 Abnormal cases in the N3IWF . 35
7.7.3 UE-initiated child SA deletion procedure . 35
7.7.3.1 UE-initiated child SA deletion procedure initiation . 35
7.7.3.2 UE-initiated child SA deletion procedure accepted by the N3IWF . 36
7.7.3.3 Abnormal cases in the UE . 36
7.7.4 Abnormal cases in the UE . 36
7.7.5 Abnormal cases in the N3IWF . 36
7.8 UE-initiated liveness check procedure . 36
7.8.1 General . 36
7.8.2 UE-initiated liveness check procedure initiation . 36
7.8.3 UE-initiated liveness check procedure completion . 36
7.8.4 Abnormal cases . 37
7.9 Network-initiated liveness check procedure . 37
ETSI

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3GPP TS 24.502 version 15.5.0 Release 15 5 ETSI TS 124 502 V15.5.0 (2019-10)
7.9.1 General . 37
7.9.2 Network-initiated liveness check procedure initiation . 37
7.9.3 Network-initiated liveness check procedure completion . 37
7.9.4 Abnormal cases . 37
7.10 IKE SA rekeying procedure . 37
7.10.1 General . 37
7.10.2 N3IWF-initiated IKE SA rekeying procedure . 37
7.10.2.1 N3IWF-initiated IKE SA rekeying procedure initiation . 37
7.10.2.2 N3IWF-initiated IKE SA rekeying procedure completion . 38
7.10.2.3 Abnormal cases . 38
7.10.3 UE-initiated IKE SA rekeying procedure . 38
7.10.3.1 UE-initiated IKE SA rekeying procedure initiation . 38
7.10.3.2 UE-initiated IKE SA rekeying procedure completion . 38
7.10.3.3 Abnormal cases . 38
7.11 IPsec SA rekeying procedure . 38
7.11.1 General . 38
7.11.2 N3IWF-initiated IPsec SA rekeying procedure . 39
7.11.2.1 N3IWF-initiated IPsec SA rekeying procedure initiation . 39
7.11.2.2 N3IWF-initiated IPsec SA rekeying procedure completion . 39
7.11.2.3 Abnormal cases . 39
7.11.3 UE-initiated IPsec SA rekeying procedure . 39
7.11.3.1 UE-initiated IPsec SA rekeying procedure initiation . 39
7.11.3.2 UE-initiated IPsec SA rekeying procedure completion . 39
7.11.3.3 Abnormal cases . 39
8 Message transport procedures . 39
8.1 General . 39
8.2 Transport of NAS messages over control plane . 40
8.2.1 General . 40
8.2.2 TCP packet encapsulation . 40
8.2.3 Establishment of TCP connection for transport of NAS messages . 42
8.2.4 Transport of NAS messages over TCP connection . 42
8.2.5 Release of TCP connection for transport of NAS messages . 42
8.3 Transport of messages over user plane . 42
8.3.1 General . 42
8.3.2 Generic routing encapsulation (GRE) . 43
9 Parameters and coding. 44
9.1 General . 44
9.2 3GPP specific coding information . 44
9.2.1 GUAMI . 44
9.2.2 Establishment cause for non-3GPP access . 45
9.2.3 PLMN ID . 45
9.2.4 IKEv2 Notify Message Type value . 46
9.2.4.1 General . 46
9.2.4.2 Private Notify Message - Error Types . 46
9.2.4.3 Private Notify Message - Status Types . 47
9.3 IETF RFC coding information . 48
9.3.1 IKEv2 Notify payloads .
...