ETSI TS 129 273 V19.2.0 (2026-03)

Universal Mobile Telecommunications System (UMTS); LTE; 5G; Evolved Packet System (EPS); 3GPP EPS AAA interfaces (3GPP TS 29.273 version 19.2.0 Release 19)

RTS/TSGC-0429273vj20

General Information

• Status: Not Published
• Technical Committee: 3GPP CT 4 - MAP/CAMEL/GTP/BCH/SS/TrFO/IMS/GUP/WLAN (formely CN4)
• Current Stage: 8 - Draft receipt by ETSI Secretariat
• Completion Date: 10-Mar-2026

Standards Content (Sample)

TECHNICAL SPECIFICATION
Universal Mobile Telecommunications System (UMTS);
LTE;
5G;
Evolved Packet System (EPS);
3GPP EPS AAA interfaces
(3GPP TS 29.273 version 19.2.0 Release 19)

3GPP TS 29.273 version 19.2.0 Release 19 1 ETSI TS 129 273 V19.2.0 (2026-03)

Reference
RTS/TSGC-0429273vj20
Keywords
5G,LTE,UMTS
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ETSI
3GPP TS 29.273 version 19.2.0 Release 19 2 ETSI TS 129 273 V19.2.0 (2026-03)
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ETSI
3GPP TS 29.273 version 19.2.0 Release 19 3 ETSI TS 129 273 V19.2.0 (2026-03)
Contents
Intellectual Property Rights . 2
Legal Notice . 2
Modal verbs terminology . 2
Foreword . 11
Introduction . 12
1 Scope . 13
2 References . 13
3 Definitions, symbols and abbreviations . 15
3.1 Definitions . 15
3.1.1 General . 15
3.1.2 Handling of Information Elements . 16
3.2 Abbreviations . 16
4 SWa and SWa' Description . 17
4.1 Functionality . 17
4.1.1 General . 17
4.1.2 Procedure Descriptions . 17
4.1.2.1 SWa Authentication and Authorization procedure . 17
4.1.2.1.1 General . 17
4.1.2.1.2 3GPP AAA Server Detailed Behaviour . 19
4.1.2.1.3 3GPP AAA Proxy Detailed Behaviour . 20
4.1.2.2 SWa HSS/AAA Initiated Detach . 20
4.1.2.3 SWa Non-3GPP Access Network Initiated Detach . 20
4.1.2.4 SWa Re-Authentication and Re-Authorization Procedure . 21
4.1.2.4.1 General . 21
4.1.2.4.2 3GPP AAA Server Detailed Behaviour . 22
4.1.2.4.3 3GPP AAA Proxy Detailed Behaviour . 23
4.1.2.5 SWa procedures for NSWO in 5GS . 23
4.2 Protocol Specification . 23
4.2.1 General . 23
4.2.2 Commands . 23
4.2.2.1 Commands for SWa authentication and authorization procedures. 23
4.2.2.1.1 Diameter-EAP-Request (DER) Command . 23
4.2.2.1.2 Diameter-EAP-Answer (DEA) Command . 24
4.2.2.2 Commands for SWa HSS/AAA Initiated Detach . 24
4.2.2.3 Commands for Untrusted non-3GPP Access network Initiated Session Termination . 25
4.2.2.4 Commands for SWa Re-Authentication and Re-Authorization Procedures . 25
4.2.2.4.1 Re-Auth-Request (RAR) Command . 25
4.2.2.4.2 Re-Auth-Answer (RAA) Command . 25
4.2.2.4.3 Diameter-EAP-Request (DER) Command . 25
4.2.2.4.4 Diameter-EAP-Answer (DEA) Command . 25
4.2.3 Information Elements . 25
4.2.4 Session Handling . 25
5 STa Description . 26
5.1 Functionality . 26
5.1.1 General . 26
5.1.2 Procedures Description . 26
5.1.2.1 STa Access Authentication and Authorization. 26
5.1.2.1.1 General . 26
5.1.2.1.2 3GPP AAA Server Detailed Behaviour . 39
5.1.2.1.3 3GPP AAA Proxy Detailed Behaviour . 45
5.1.2.1.4 Trusted non-3GPP access network Detailed Behaviour . 46
5.1.2.2 HSS/AAA Initiated Detach on STa . 48
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5.1.2.2.1 General . 48
5.1.2.2.2 3GPP AAA Server Detailed Behaviour . 49
5.1.2.2.3 3GPP AAA Proxy Detailed Behaviour . 50
5.1.2.3 STa Re-Authorization and Re-Authentication Procedures . 50
5.1.2.3.1 General . 50
5.1.2.3.2 3GPP AAA Server Detailed Behaviour . 59
5.1.2.3.3 3GPP AAA Proxy Detailed Behaviour . 60
5.1.2.3.4 Trusted Non-3GPP Access Network Detailed Behaviour . 61
5.1.2.4 Non-3GPP Access Network Initiated Session Termination . 62
5.1.2.4.1 General . 62
5.1.2.4.2 3GPP AAA Server Detailed Behaviour . 62
5.1.2.4.3 3GPP AAA Proxy Detailed Behaviour . 62
5.1.2.5 ERP Re-Authentication in Non-3GPP Access . 63
5.1.2.5.1 General . 63
5.1.2.5.2 ER server located in 3GPP AAA Proxy or 3GPP AAA Server Detailed Behaviour . 64
5.1.2.5.3 3GPP AAA Proxy Detailed Behaviour . 64
5.2 Protocol Specification . 64
5.2.1 General . 64
5.2.2 Commands . 65
5.2.2.1 Commands for STa PMIPv6 or GTPv2 or ERP (re-)authentication and authorization procedures . 65
5.2.2.1.1 Diameter-EAP-Request (DER) Command . 65
5.2.2.1.2 Diameter-EAP-Answer (DEA) Command . 65
5.2.2.2 Commands for STa HSS/AAA Initiated Detach for Trusted non-3GPP Access . 66
5.2.2.2.1 Abort-Session-Request (ASR) Command . 66
5.2.2.2.2 Abort-Session-Answer (ASA) Command . 67
5.2.2.2.3 Session-Termination-Request (STR) Command . 67
5.2.2.2.4 Session-Termination-Answer (STA) Command . 67
5.2.2.3 Commands for Re-Authentication and Re-Authorization Procedure . 67
5.2.2.3.1 Re-Auth-Request (RAR) Command . 67
5.2.2.3.2 Re-Auth-Answer (RAA) Command . 68
5.2.2.3.3 AA-Request (AAR) Command . 68
5.2.2.3.4 AA-Answer (AAA) Command . 68
5.2.2.3.5 Diameter-EAP-Request (DER) Command . 69
5.2.2.3.6 Diameter-EAP-Answer (DEA) Command . 69
5.2.2.4 Commands for Trusted non-3GPP Access network Initiated Session Termination . 69
5.2.2.4.1 Session-Termination-Request (STR) Command . 69
5.2.2.4.2 Session-Termination-Answer (STA) Command . 69
5.2.3 Information Elements . 70
5.2.3.1 General . 70
5.2.3.2 Mobile-Node-Identifier . 72
5.2.3.3 MIP6-Feature-Vector . 73
5.2.3.4 QoS Capability . 73
5.2.3.5 Service-Selection . 73
5.2.3.6 RAT-Type . 73
5.2.3.7 ANID . 74
5.2.3.8 AMBR . 74
5.2.3.9 AN-Trusted . 74
5.2.3.10 Feature-List-ID AVP . 74
5.2.3.11 Feature-List AVP . 74
5.2.3.12 MIP-FA-RK . 74
5.2.3.13 MIP-FA-RK-SPI . 74
5.2.3.14 Full-Network-Name . 74
5.2.3.15 Short-Network-Name . 74
5.2.3.16 Void. 75
5.2.3.17 Void. 75
5.2.3.18 WLAN-Identifier . 75
5.2.3.19 Transport-Access-Type . 75
5.2.3.20 DER-Flags . 75
5.2.3.21 DEA-Flags . 76
5.2.3.22 SSID . 77
5.2.3.23 HESSID . 77
5.2.3.24 Access-Network-Info . 77
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5.2.3.25 TWAN-Connection-Mode . 78
5.2.3.26 TWAN-Connectivity-Parameters . 78
5.2.3.27 Connectivity-Flags . 79
5.2.3.28 TWAN-PCO. 79
5.2.3.29 TWAG-CP-Address . 79
5.2.3.30 TWAG-UP-Address . 79
5.2.3.31 TWAN-S2a-Failure-Cause . 79
5.2.3.32 SM-Back-Off-Timer . 80
5.2.3.33 WLCP-Key. 80
5.2.3.34 Void. 80
5.2.3.35 IMEI-Check-In-VPLMN-Result . 80
5.2.3.36 High-Priority-Access-Info . 81
5.2.4 Session Handling . 81
6 SWd and SWd' Description . 81
6.1 Functionality . 81
6.1.1 General . 81
6.1.2 Procedures Description . 82
6.1.2.1 Trusted non-3GPP Access / Access Gateway related procedures . 82
6.1.2.1.1 Trusted Non-3GPP Access Authentication and Authorization . 82
6.1.2.1.2 HSS/AAA Initiated Detach for Trusted non-3GPP Access . 85
6.1.2.1.3 Access and Service Authorization information update . 85
6.1.2.1.4 Trusted non-3GPP Access Network Initiated Session Termination . 86
6.1.2.2 Untrusted non-3GPP Access / ePDG related procedures . 86
6.1.2.3 PDN GW related procedures . 87
6.1.2.4 SWd' procedures for NSWO in 5GS . 87
6.2 Protocol Specification . 88
6.2.1 General . 88
6.2.2 Commands . 88
6.2.2.1 Commands used in connection with the STa interface . 88
6.2.2.1.1 Commands for STa PMIPv6 or GTPv2 authentication and authorization procedures . 88
6.2.2.1.2 Commands for STa HSS/AAA Initiated Detach for Trusted non-3GPP Access . 90
6.2.2.1.3 Commands for STa Access and Service Authorization Update Procedure . 90
6.2.2.1.4 Commands for Trusted non-3GPP Access network Initiated Session Termination . 90
6.2.2.2 Commands used in connection with the SWm interface . 90
6.2.2.3 Commands used in connection with the S6b interface . 90
6.2.3 Information Elements . 90
6.2.3.1 General . 90
7 SWm Description . 92
7.1 Functionality . 92
7.1.1 General . 92
7.1.2 Procedures Description . 93
7.1.2.1 Authentication and Authorization Procedures . 93
7.1.2.1.1 General . 93
7.1.2.1.2 3GPP AAA Server Detailed Behaviour . 100
7.1.2.1.3 3GPP AAA Proxy Detailed Behaviour . 103
7.1.2.1.4 ePDG Detailed Behaviour . 104
7.1.2.2 Authorization Procedures . 106
7.1.2.2.1 General . 106
7.1.2.2.2 3GPP AAA Server Detailed Behaviour . 110
7.1.2.2.3 3GPP AAA Proxy Detailed Behaviour . 111
7.1.2.2.4 ePDG Detailed Behaviour . 111
7.1.2.3 ePDG Initiated Session Termination Procedures . 112
7.1.2.3.1 General . 112
7.1.2.3.2 3GPP AAA Server Detailed Behavior . 113
7.1.2.3.3 3GPP AAA Proxy Detailed Behavior . 113
7.1.2.4 3GPP AAA Server Initiated Session Termination Procedures . 113
7.1.2.4.1 General . 113
7.1.2.4.2 3GPP AAA Server Detailed Behaviour . 114
7.1.2.4.3 3GPP AAA Proxy Detailed Behaviour . 115
7.1.2.5 Authorization Information Update Procedures . 115
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7.1.2.5.1 General . 115
7.1.2.5.2 3GPP AAA Server Detailed Behaviour . 116
7.1.2.5.3 ePDG Detailed Behaviour . 116
7.2 Protocol Specification . 116
7.2.1 General . 116
7.2.2 Commands . 117
7.2.2.1 Commands for SWm Authentication and Authorization Procedures . 117
7.2.2.1.1 Diameter-EAP-Request (DER) Command . 117
7.2.2.1.2 Diameter-EAP-Answer (DEA) Command . 117
7.2.2.1.3 Diameter-AA-Request (AAR) Command . 118
7.2.2.1.4 Diameter-AA-Answer (AAA) Command . 118
7.2.2.2 Commands for ePDG Initiated Session Termination . 119
7.2.2.2.1 Session-Termination-Request (STR) Command . 119
7.2.2.2.2 Session-Termination-Answer (STA) Command . 119
7.2.2.3 Commands for 3GPP AAA Server Initiated Session Termination . 120
7.2.2.3.1 Abort-Session-Request (ASR) Command . 120
7.2.2.3.2 Abort-Session-Answer (ASA) Command . 120
7.2.2.3.3 Session-Termination-Request (STR) Command . 120
7.2.2.3.4 Session-Termination-Answer (STA) Command . 120
7.2.2.4 Commands for Authorization Information Update . 121
7.2.2.4.1 Re-Auth-Request (RAR) Command . 121
7.2.2.4.2 Re-Auth-Answer (RAA) Command . 121
7.2.3 Information Elements . 121
7.2.3.1 General . 121
7.2.3.2 Feature-List-ID AVP . 123
7.2.3.3 Feature-List AVP . 123
7.2.3.4 Emergency-Services . 123
7.2.3.5 AAR-Flags . 124
7.2.4 Session Handling . 124
8 SWx Description . 124
8.1 Functionality . 124
8.1.1 General . 124
8.1.2 Procedures Description . 124
8.1.2.1 Authentication Procedure . 124
8.1.2.1.1 General . 124
8.1.2.1.2 Detailed behaviour . 127
8.1.2.2 Location Management Procedures . 128
8.1.2.2.1 General . 128
8.1.2.2.2 UE/PDN Registration/DeRegistration Notification . 128
8.1.2.2.3 Network Initiated De-Registration by HSS, Administrative . 133
8.1.2.3 HSS Initiated Update of User Profile . 134
8.1.2.3.1 General . 134
8.1.2.3.2 HSS Detailed behaviour . 136
8.1.2.3.3 3GPP AAA Server Detailed behaviour . 136
8.1.2.4 Fault Recovery Procedures . 137
8.1.2.4.1 HSS Reset Indication . 137
8.1.2.4.2 HSS Restoration . 138
8.2 Protocol Specification . 140
8.2.1 General . 140
8.2.2 Commands . 140
8.2.2.1 Authentication Procedure . 140
8.2.2.2 HSS Initiated Update of User Profile Procedure . 141
8.2.2.3 Non-3GPP IP Access Registration Procedure . 142
8.2.2.4 Network Initiated De-Registration by HSS Procedure . 143
8.2.3 Information Elements . 144
8.2.3.0 General . 144
8.2.3.1 Non-3GPP-User-Data . 146
8.2.3.2 Subscription-ID . 147
8.2.3.3 Non-3GPP-IP-Access . 147
8.2.3.4 Non-3GPP-IP-Access-APN . 147
8.2.3.5 RAT-Type . 147
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8.2.3.6 Session-Timeout . 147
8.2.3.7 APN-Configuration . 147
8.2.3.8 ANID . 148
8.2.3.9 SIP-Auth-Data-Item . 148
8.2.3.10 Confidentiality-Key. 148
8.2.3.11 Integrity-Key . 148
8.2.3.12 Server-Assignment-Type AVP . 148
8.2.3.13 Trace-Info. 149
8.2.3.14 Trace-Data . 149
8.2.3.15 Feature-List-ID AVP . 149
8.2.3.16 Feature-List AVP . 149
8.2.3.17 PPR-Flags . 152
8.2.3.18 TWAN-Default-APN-Context-Id . 152
8.2.3.19 TWAN-Access-Info . 152
8.2.3.20 Access-Authorization-Flags . 153
8.2.3.21 AAA-Failure-Indication . 153
8.2.3.22 OC-Supported-Features . 153
8.2.3.23 OC-OLR .
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