ETSI TS 124 501 V17.9.0 (2023-01)

5G; Non-Access-Stratum (NAS) protocol for 5G System (5GS); Stage 3 (3GPP TS 24.501 version 17.9.0 Release 17)

RTS/TSGC-0124501vh90

General Information

• Status: Not Published
• Technical Committee: 3GPP CT 1 - MM/CC/SM [lu] (formely CN1)
• Current Stage: 12 - Citation in the OJ (auto-insert)
• Completion Date: 10-Jan-2023

Standards Content (Sample)

ETSI TS 124 501 V17.9.0 (2023-01)






TECHNICAL SPECIFICATION
5G;
Non-Access-Stratum (NAS) protocol for 5G System (5GS);
Stage 3
(3GPP TS 24.501 version 17.9.0 Release 17)

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3GPP TS 24.501 version 17.9.0 Release 17 1 ETSI TS 124 501 V17.9.0 (2023-01)

Reference
RTS/TSGC-0124501vh90
Keywords
5G
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ETSI

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3GPP TS 24.501 version 17.9.0 Release 17 2 ETSI TS 124 501 V17.9.0 (2023-01)
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ETSI

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3GPP TS 24.501 version 17.9.0 Release 17 3 ETSI TS 124 501 V17.9.0 (2023-01)
Contents
Intellectual Property Rights . 2
Legal Notice . 2
Modal verbs terminology . 2
Foreword . 24
1 Scope . 25
2 References . 25
3 Definitions and abbreviations . 29
3.1 Definitions . 29
3.2 Abbreviations . 40
4 General . 43
4.1 Overview . 43
4.2 Coordination between the protocols for 5GS mobility management and 5GS session management . 43
4.3 UE domain selection . 44
4.3.1 UE's usage setting . 44
4.3.2 Domain selection for UE originating sessions / calls . 44
4.3.3 Change of UE's usage setting . 46
4.3.4 Change or determination of IMS voice availability . 46
4.4 NAS security . 47
4.4.1 General . 47
4.4.2 Handling of 5G NAS security contexts. 47
4.4.2.1 General . 47
4.4.2.2 Establishment of a mapped 5G NAS security context during inter-system change from S1 mode
to N1 mode in 5GMM-CONNECTED mode . 50
4.4.2.3 Establishment of a 5G NAS security context during N1 mode to N1 mode handover . 51
4.4.2.4 Establishment of an EPS security context during inter-system change from N1 mode to S1 mode
in 5GMM-CONNECTED mode . 52
4.4.2.5 Establishment of secure exchange of NAS messages . 52
4.4.2.6 Change of security keys . 54
4.4.3 Handling of NAS COUNT and NAS sequence number . 55
4.4.3.1 General . 55
4.4.3.2 Replay protection . 56
4.4.3.3 Integrity protection and verification . 56
4.4.3.4 Ciphering and deciphering . 56
4.4.3.5 NAS COUNT wrap around . 57
4.4.4 Integrity protection of NAS signalling messages. 57
4.4.4.1 General . 57
4.4.4.2 Integrity checking of NAS signalling messages in the UE . 58
4.4.4.3 Integrity checking of NAS signalling messages in the AMF . 58
4.4.5 Ciphering of NAS signalling messages . 60
4.4.6 Protection of initial NAS signalling messages . 60
4.4.7 Protection of NAS IEs . 62
4.5 Unified access control . 63
4.5.1 General . 63
4.5.2 Determination of the access identities and access category associated with a request for access for
UEs not operating in SNPN access mode . 65
4.5.2A Determination of the access identities and access category associated with a request for access for
UEs operating in SNPN access mode . 70
4.5.3 Operator-defined access categories . 75
4.5.4 Access control and checking . 77
4.5.4.1 Access control and checking in 5GMM-IDLE mode and in 5GMM-IDLE mode with suspend
indication . 77
4.5.4.2 Access control and checking in 5GMM-CONNECTED mode and in 5GMM-CONNECTED
mode with RRC inactive indication . 79
4.5.5 Exception handling and avoiding double barring . 81
ETSI

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3GPP TS 24.501 version 17.9.0 Release 17 4 ETSI TS 124 501 V17.9.0 (2023-01)
4.5.6 Mapping between access categories/access identities and RRC establishment cause . 85
4.6 Network slicing . 86
4.6.1 General . 86
4.6.2 Mobility management aspects. 88
4.6.2.1 General . 88
4.6.2.2 NSSAI storage . 89
4.6.2.3 Provision of NSSAI to lower layers in 5GMM-IDLE mode . 94
4.6.2.4 Network slice-specific authentication and authorization . 96
4.6.2.5 Mobility management based network slice admission control . 97
4.6.2.6 Provision of NSAG information to lower layers . 98
4.6.3 Session management aspects . 99
4.6.3.0 General . 99
4.6.3.1 Session management based network slice admission control . 99
4.6.3.2 Support of network slice admission control and interworking with EPC . 100
4.6.3.3 Session management based network slice data rate limitation control . 100
4.7 NAS over non-3GPP access . 100
4.7.1 General . 100
4.7.2 5GS mobility management aspects . 101
4.7.2.1 General . 101
4.7.2.2 Establishment cause for non-3GPP access . 102
4.7.3 5GS session management aspects . 103
4.7.4 Limited service state over non-3GPP access . 103
4.7.5 NAS signalling using trusted WLAN access network . 104
4.8 Interworking with E-UTRAN connected to EPC . 104
4.8.1 General . 104
4.8.2 Single-registration mode . 104
4.8.2.1 General . 104
4.8.2.2 Single-registration mode with N26 interface . 105
4.8.2.3 Single-registration mode without N26 interface . 105
4.8.2.3.1 Interworking between NG-RAN and E-UTRAN . 105
4.8.2.3.2 Interworking between TNGF or N3IWF connected to 5GCN and E-UTRAN. 106
4.8.3 Dual-registration mode . 107
4.8.4 Core Network selection for UEs not using CIoT 5GS optimizations . 108
4.8.4A Core Network selection and redirection for UEs using CIoT optimizations. 109
4.8.4A.1 Core network selection . 109
4.8.4A.2 Redirection of the UE by the core network . 109
4.9 Disabling and re-enabling of UE's N1 mode capability . 110
4.9.1 General . 110
4.9.2 Disabling and re-enabling of UE's N1 mode capability for 3GPP access . 110
4.9.3 Disabling and re-enabling of UE's N1 mode capability for non-3GPP access. 112
4.10 Interworking with ePDG connected to EPC . 113
4.11 UE configuration parameter updates . 113
4.12 Access traffic steering, switching and splitting (ATSSS) . 114
4.13 Support of NAS signalling using wireline access network . 114
4.14 Non-public network . 115
4.14.1 General . 115
4.14.2 Stand-alone non-public network . 115
4.14.3 Public network integrated non-public network (PNI-NPN) . 117
4.15 Time synchronization and time sensitive communication . 118
4.15.1 General . 118
4.15.2 Void . 118
4.15.2.1 Void. 118
4.15.2.2 Void. 118
4.15.2.3 Void. 118
4.15.3 Time synchronization . 118
4.15.4 User plane node management . 118
4.16 UE radio capability signalling optimisation . 119
4.17 5GS mobility management in NB-N1 mode . 120
4.18 5GS session management in NB-N1 mode . 120
4.19 5GS mobility management in WB-N1 mode for IoT . 120
4.20 5GS session management in WB-N1 mode for IoT . 121
4.21 Authentication and Key Management for Applications (AKMA) . 121
ETSI

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3GPP TS 24.501 version 17.9.0 Release 17 5 ETSI TS 124 501 V17.9.0 (2023-01)
4.22 Uncrewed aerial vehicle identification, authentication, and authorization . 122
4.22.1 General . 122
4.22.2 Authentication and authorization of UAV . 122
4.22.3 Authorization of C2 communication . 123
4.22.4 Void . 123
4.23 NAS over Non-Terrestrial Network . 123
4.23.1 General . 123
4.23.2 List of "PLMNs not allowed to operate at the present UE location" . 124
4.23.3 5GS mobility management via a satellite NG-RAN cell . 125
4.23.4 5GS session management via a satellite NG-RAN cell . 125
4.23.5 Handling multiple tracking area codes from the lower layers. 125
4.24 Minimization of service interruption . 126
4.25 Support of MUSIM features . 127
5 Elementary procedures for 5GS mobility management . 128
5.1 Overview . 128
5.1.1 General . 128
5.1.2 Types of 5GMM procedures . 128
5.1.3 5GMM sublayer states . 129
5.1.3.1 General . 129
5.1.3.2 5GMM sublayer states . 129
5.1.3.2.1 5GMM sublayer states in the UE. 129
5.1.3.2.1.1 General . 129
5.1.3.2.1.2 Main states . 130
5.1.3.2.1.2.1 5GMM-NULL . 130
5.1.3.2.1.2.2 5GMM-DEREGISTERED . 130
5.1.3.2.1.2.3 5GMM-REGISTERED-INITIATED . 130
5.1.3.2.1.2.4 5GMM-REGISTERED . 130
5.1.3.2.1.2.5 5GMM-DEREGISTERED-INITIATED . 130
5.1.3.2.1.2.6 5GMM-SERVICE-REQUEST-INITIATED. 130
5.1.3.2.1.3 Substates of state 5GMM-DEREGISTERED . 131
5.1.3.2.1.3.1 General . 131
5.1.3.2.1.3.2 5GMM-DEREGISTERED.NORMAL-SERVICE . 131
5.1.3.2.1.3.3 5GMM-DEREGISTERED.LIMITED-SERVICE . 131
5.1.3.2.1.3.4 5GMM-DEREGISTERED.ATTEMPTING-REGISTRATION . 131
5.1.3.2.1.3.5 5GMM-DEREGISTERED.PLMN-SEARCH . 131
5.1.3.2.1.3.6 5GMM-DEREGISTERED.NO-SUPI . 131
5.1.3.2.1.3.7 5GMM-DEREGISTERED.NO-CELL-AVAILABLE . 131
5.1.3.2.1.3.8 5GMM-DEREGISTERED.eCALL-INACTIVE . 131
5.1.3.2.1.3.9 5GMM-DEREGISTERED.INITIAL-REGISTRATION-NEEDED . 132
5.1.3.2.1.4 Substates of state 5GMM-REGISTERED . 132
5.1.3.2.1.4.1 General . 132
5.1.3.2.1.4.2 5GMM-REGISTERED.NORMAL-SERVICE .
...