|
TECHNICAL SPECIFICATION
5G;
System architecture for the 5G System (5GS)
(3GPP TS 23.501 version 16.7.0 Release 16)
---------------------- Page: 1 ----------------------
3GPP TS 23.501 version 16.7.0 Release 16 1 ETSI TS 123 501 V16.7.0 (2021-01)
Reference
RTS/TSGS-0223501vg70
Keywords
5G
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE
Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16
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:
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
If you find errors in the present document, please send your comment to one of the following services:
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 23.501 version 16.7.0 Release 16 2 ETSI TS 123 501 V16.7.0 (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 .
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 23.501 version 16.7.0 Release 16 3 ETSI TS 123 501 V16.7.0 (2021-01)
Contents
Intellectual Property Rights . 2
Legal Notice . 2
Modal verbs terminology . 2
Foreword . 16
1 Scope . 17
2 References . 17
3 Definitions and abbreviations . 21
3.1 Definitions . 21
3.2 Abbreviations . 26
4 Architecture model and concepts . 29
4.1 General concepts . 29
4.2 Architecture reference model . 29
4.2.1 General . 29
4.2.2 Network Functions and entities . 30
4.2.3 Non-roaming reference architecture . 31
4.2.4 Roaming reference architectures . 34
4.2.5 Data Storage architectures . 38
4.2.5a Radio Capabilities Signalling optimisatio n . 39
4.2.6 Service-based interfaces . 40
4.2.7 Reference points . 40
4.2.8 Support of non-3GPP access . 42
4.2.8.0 General . 42
4.2.8.1 General Concepts to Support Trusted and Untrusted Non-3GPP Access . 43
4.2.8.1A General Concepts to support Wireline Access . 44
4.2.8.2 Architecture Reference Model for Trusted and Untrusted Non-3GPP Accesses . 45
4.2.8.2.1 Non-roaming Architecture . 45
4.2.8.2.2 LBO Roaming Architecture . 46
4.2.8.2.3 Home-routed Roaming Architecture . 48
4.2.8.3 Reference Points for Non-3GPP Access . 50
4.2.8.3.1 Overview . 50
4.2.8.3.2 Requirements on Ta . 51
4.2.8.4 Architecture Reference Model for Wireline Access network. 51
4.2.8.5 Access to 5GC from devices that do not support 5GC NAS over WLAN access . 52
4.2.8.5.1 General . 52
4.2.8.5.2 Reference Architecture . 53
4.2.8.5.3 Network Functions . 53
4.2.8.5.4 Reference Points . 53
4.2.9 Network Analytics architecture . 54
4.2.10 Architecture Reference Model for ATSSS Support . 54
4.3 Interworking with EPC . 55
4.3.1 Non-roaming architecture . 55
4.3.2 Roaming architecture . 56
4.3.3 Interworking between 5GC via non-3GPP access and E-UTRAN connected to EPC . 58
4.3.3.1 Non-roaming architecture . 58
4.3.3.2 Roaming architecture . 59
4.3.4 Interworking between ePDG connected to EPC and 5GS . 61
4.3.4.1 Non-roaming architecture . 61
4.3.4.2 Roaming architectures . 62
4.3.5 Service Exposure in Interworking Scenarios . 64
4.3.5.1 Non-roaming architecture . 64
4.3.5.2 Roaming architectures . 65
4.4 Specific services . 66
4.4.1 Public Warning System . 66
4.4.2 SMS over NAS . 66
ETSI
---------------------- Page: 4 ----------------------
3GPP TS 23.501 version 16.7.0 Release 16 4 ETSI TS 123 501 V16.7.0 (2021-01)
4.4.2.1 Architecture to support SMS over NAS . 66
4.4.2.2 Reference point to support SMS over NAS . 68
4.4.2.3 Service based interface to support SMS over NAS . 68
4.4.3 IMS support . 68
4.4.4 Location services . 68
4.4.4.1 Architecture to support Location Services . 68
4.4.4.2 Reference point to support Location Services . 68
4.4.4.3 Service Based Interfaces to support Location Services . 68
4.4.5 Application Triggering Services . 69
4.4.6 5G LAN-type Services . 69
4.4.6.1 User plane architecture to support 5G LAN-type service . 69
4.4.6.2 Reference points to support 5G LAN-type service . 69
4.4.7 MSISDN-less MO SMS Service . 69
4.4.8 Time Sensitive Communication . 70
4.4.8.1 General . 70
4.4.8.2 Architecture to support Time Sensitive Communication . 70
5 High level features. 71
5.1 General . 71
5.2 Network Access Control . 71
5.2.1 General . 71
5.2.2 Network selection . 72
5.2.3 Identification and authentication . 72
5.2.4 Authorisation . 72
5.2.5 Access control and barring . 72
5.2.6 Policy control . 73
5.2.7 Lawful Interception. 73
5.3 Registration and Connection Management . 73
5.3.1 General . 73
5.3.2 Registration Management . 73
5.3.2.1 General . 73
5.3.2.2 5GS Registration Management states. 73
5.3.2.2.1 General . 73
5.3.2.2.2 RM-DEREGISTERED state . 73
5.3.2.2.3 RM-REGISTERED state . 74
5.3.2.2.4 5GS Registration Management State models . 75
5.3.2.3 Registration Area management . 75
5.3.2.4 Support of a UE registered over both 3GPP and Non-3GPP access . 76
5.3.3 Connection Management . 78
5.3.3.1 General . 78
5.3.3.2 5GS Connection Management states . 78
5.3.3.2.1 General . 78
5.3.3.2.2 CM-IDLE state . 78
5.3.3.2.3 CM-CONNECTED state . 79
5.3.3.2.4 5GS Connection Management State models . 79
5.3.3.2.5 CM-CONNECTED with RRC Inactive state . 80
5.3.3.3 NAS signalling connection management . 82
5.3.3.3.1 General . 82
5.3.3.3.2 NAS signalling connection establishment . 82
5.3.3.3.3 NAS signalling connection Release. 82
5.3.3.4 Support of a UE connected over both 3GPP and Non-3GPP access . 82
5.3.4 UE Mobility . 83
5.3.4.1 Mobility Restrictions . 83
5.3.4.1.1 General . 83
5.3.4.1.2 Management of Service Area Restrictions . 85
5.3.4.2 Mobility Pattern . 86
5.3.4.3 Radio Resource Management functions . 86
5.3.4.4 UE mobility event notification . 87
5.4 3GPP access specific aspects. 88
5.4.1 UE reachability in CM-IDLE. 88
5.4.1.1 General . 88
5.4.1.2 UE reachability allowing mobile terminated data while the UE is CM-IDLE . 89
ETSI
---------------------- Page: 5 ----------------------
3GPP TS 23.501 version 16.7.0 Release 16 5 ETSI TS 123 501 V16.7.0 (2021-01)
5.4.1.3 Mobile Initiated Connection Only (MICO) mode . 89
5.4.2 UE reachability in CM-CONNECTED. 90
5.4.3 Paging strategy handling . 90
5.4.3.1 General . 90
5.4.3.2 Paging Policy Differentiation . 91
5.4.3.3 Paging Priority . 91
5.4.4 UE Radio Capability handling . 92
5.4.4.1 UE radio capability information storage in the AMF . 92
5.4.4.1a UE radio capability signalling optimisation (RACS) . 92
5.4.4.2 Void. 96
5.4.4.2a UE Radio Capability Match Request . 96
5.4.4.3 Paging assistance information . 96
5.4.4a UE MM Core Network Capability handling . 97
5.4.4b UE 5GSM Core Network Capability handling . 97
5.4.5 DRX (Discontinuous Reception) framework . 98
5.4.6 Core Network assistance information for RAN optimization . 98
5.4.6.1 General . 98
5.4.6.2 Core Network assisted RAN parameters tuning . 98
5.4.6.3 Core Network assisted RAN paging information . 99
5.4.7 NG-RAN location reporting . 100
5.4.8 Support for identification and restriction of using unlicensed spectrum . 100
5.4.9 Wake Up Signal Assistance . 101
5.4.9.1 General . 101
5.4.9.2 Group Wake Up Signal . 101
5.5 Non-3GPP access specific aspects . 102
5.5.0 General . 102
5.5.1 Registration Management . 102
5.5.2 Connection Management . 102
5.5.3 UE Reachability . 104
5.5.3.1 UE reachability in CM-IDLE . 104
5.5.3.2 UE reachability in CM-CONNECTED . 104
5.6 Session Management . 104
5.6.1 Overview . 104
5.6.2 Interaction between AMF and SMF . 107
5.6.3 Roaming . 109
5.6.4 Single PDU Session with multiple PDU Session Anchors . 110
5.6.4.1 General . 110
5.6.4.2 Usage of an UL Classifier for a PDU Session . 111
5.6.4.3 Usage of IPv6 multi-homing for a PDU Session. 112
5.6.5 Support for Local Area Data Network . 114
5.6.6 Secondary authentication/authorization by a DN-AAA server during the establishment of a PDU
Session . 116
5.6.7 Application Function influence on traffic routing . 117
5.6.7.1 General . 117
5.6.7.2 Enhancement of UP path management based on the coordination with AFs . 122
5.6.8 Selective activation and deactivation of UP connection of existing PDU Session . 123
5.6.9 Session and Service Continuity . 124
5.6.9.1 General .
...