ETSI TS 133 127 V15.4.0 (2020-04)

LTE; 5G; Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); Lawful Interception (LI) architecture and functions (3GPP TS 33.127 version 15.4.0 Release 15)

RTS/TSGS-0333127vf40

General Information

• Status: Published
• Publication Date: 16-Apr-2020
• Technical Committee: 3GPP SA 3 - Security
• Current Stage: 12 - Completion
• Completion Date: 17-Apr-2020

Standards Content (Sample)

ETSI TS 133 127 V15.4.0 (2020-04)






TECHNICAL SPECIFICATION
LTE;
5G;
Digital cellular telecommunications system (Phase 2+) (GSM);
Universal Mobile Telecommunications System (UMTS);
Lawful Interception (LI) architecture and functions
(3GPP TS 33.127 version 15.4.0 Release 15)

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3GPP TS 33.127 version 15.4.0 Release 15 1 ETSI TS 133 127 V15.4.0 (2020-04)



Reference
RTS/TSGS-0333127vf40
Keywords
5G,GSM,LTE,SECURITY,UMTS
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3GPP TS 33.127 version 15.4.0 Release 15 2 ETSI TS 133 127 V15.4.0 (2020-04)
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
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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
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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
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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 33.127 version 15.4.0 Release 15 3 ETSI TS 133 127 V15.4.0 (2020-04)
Contents
Intellectual Property Rights . 2
Legal Notice . 2
Modal verbs terminology . 2
Foreword . 6
Introduction . 6
1 Scope . 7
2 References . 7
3 Definitions, symbols and abbreviations . 8
3.1 Definitions . 8
3.2 Symbols . 8
3.3 Abbreviations . 8
4 Requirements realisation . 9
5 Functional architecture . 10
5.1 General . 10
5.2 High-level generic LI architecture . 10
5.3 Functional entities . 11
5.3.1 Law Enforcement Agency (LEA) . 11
5.3.2 Point of Interception (POI) . 12
5.3.2.1 General . 12
5.3.2.2 Directly provisioned and triggered POIs . 12
5.3.2.3 IRI-POIs and CC-POIs . 12
5.3.2.4 Failure handling . 12
5.3.3 Triggering Function . 12
5.3.4 Mediation and Delivery Function (MDF) . 12
5.3.5 Administrative Function (ADMF) . 13
5.3.5.1 General . 13
5.3.5.2 LICF . 14
5.3.5.3 LIPF . 14
5.3.6 System Information Retrieval Function (SIRF) . 14
5.3.7 LEMF – Law Enforcement Monitoring Facility . 14
5.4 LI interfaces . 15
5.4.1 General . 15
5.4.2 Interface LI_SI . 15
5.4.3 Interface LI_HI1 . 15
5.4.4 Interface LI_X1 . 16
5.4.4.1 General . 16
5.4.4.2 LIPF and POI . 16
5.4.4.3 LIPF and TF . 16
5.4.4.4 LIPF and MDF2/MDF3 . 17
5.4.5 Interface LI_X2 . 17
5.4.6 Interface LI_X3 . 17
5.4.7 Interface LI_T . 17
5.4.7.1 General . 17
5.4.7.2 Interface LI_T2 . 18
5.4.7.3 Interface LI_T3 . 18
5.4.8 Interface LI_HI2 . 18
5.4.9 Interface LI_HI3 . 18
5.4.10 Interface LI_HI4 . 18
5.4.10.1 General . 18
5.4.10.2 LI operation notification . 18
5.4.10.3 Contents of the notification . 19
5.4.11 Interface LI_ADMF . 19
ETSI

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3GPP TS 33.127 version 15.4.0 Release 15 4 ETSI TS 133 127 V15.4.0 (2020-04)
5.4.12 Interface LI_MDF . 19
5.5 LI service discovery . 19
5.6 LI in a virtualised environment . 19
5.6.1 General . 19
5.6.2 Virtualised deployment architecture . 20
6 Network layer based interception . 21
6.1 General . 21
6.2 5G . 21
6.2.1 General . 21
6.2.2 LI at AMF . 22
6.2.2.1 Architecture . 22
6.2.2.2 Target identities . 23
6.2.2.3 Identity privacy . 24
6.2.2.4 IRI events . 24
6.2.2.5 Common IRI parameters . 24
6.2.2.6 Specific IRI parameters . 25
6.2.2.7 Network topologies . 25
6.2.3 LI for SMF/UPF . 25
6.2.3.1 Architecture . 25
6.2.3.2 Target identities . 27
6.2.3.3 IRI events . 28
6.2.3.4 Common IRI parameters . 28
6.2.3.5 Specific IRI parameters . 28
6.2.3.6 Network topologies . 28
6.2.4 LI at UDM for 5G . 29
6.2.5 LI at SMSF . 29
6.2.5.1 Architecture . 29
6.2.5.2 Target identities . 30
6.2.5.3 IRI events . 31
6.2.5.4 Common IRI parameters . 31
6.2.5.5 Specific IRI parameters . 31
6.2.5.6 Network topologies . 31
6.2.6 LI support at NRF . 31
6.2.6.1 Architecture . 31
6.2.6.2 LI_SI notifications . 32
6.2.6.3 LI_SI parameters . 32
6.2.7 External data storage . 33
6.3 4G . 33
6.4 3G . 33
6.5 VoNR . 33
7 Service layer based interception . 34
7.1 General . 34
7.2 Central subscriber management . 34
7.2.1 General . 34
7.2.2 LI at UDM . 34
7.2.2.1 Architecture . 34
7.2.2.2 Target identities . 35
7.2.2.3 Identity privacy . 36
7.2.2.4 IRI events . 36
7.2.2.5 Common IRI parameters . 36
7.2.2.6 Specific IRI parameters . 36
7.2.2.7 Network topologies . 36
7.2.3 LI at HSS . 37
7.3 Location . 37
7.3.1 General . 37
7.3.2 Service usage location reporting . 37
7.3.2.1 General . 37
7.3.2.2 Embedded location reporting . 37
7.3.2.3 Separated location reporting. 37
7.3.3 Lawful Access Location Services (LALS) . 38
ETSI

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3GPP TS 33.127 version 15.4.0 Release 15 5 ETSI TS 133 127 V15.4.0 (2020-04)
7.3.3.1 General . 38
7.3.3.2 Target positioning . 38
7.3.3.2.1 General . 38
7.3.3.2.2 Immediate location provision . 39
7.3.3.2.3 Periodic location provision . 39
7.3.3.3 Triggered location . 39
7.3.3.4 LI_X2 interface for target positioning and triggered location . 40
7.3.4 Cell database information reporting . 41
7.4 IMS . 42
8 LI security considerations . 42
8.1 Introduction . 42
8.2 Architectural alternatives . 42
8.2.1 Full target list at every POI node . 42
8.2.2 Full target list only in LICF . 42
8.2.3 Provisioning for registered users . 43
8.3 LI key management at ADMF . 43
8.3.1 General . 43
8.3.2 Key management . 43
8.4 Virtualised LI security . 43
8.4.1 General . 43
8.5 Points of Interception . 43
Annex A (informative): 5G LI network topology views . 45
A.1 Non-roaming scenario . 45
A.1.1 General . 45
A.1.2 Service-based representation with point-to-point LI system . 45
A.2 Interworking with EPC/E-UTRAN . 46
A.2.1 General . 46
A.2.2 Topology view for a non-roaming scenario . 47
A.3 Multiple DN connections in a PDU session . 49
A.3.1 General . 49
A.3.2 Topology view for a non-roaming scenario . 49
A.4 Non-3GPP access in a non-roaming scenario . 51
A.4.1 General . 51
A.4.2 Topology view . 51
Annex Z (informative): Change history . 53
History . 54

ETSI

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3GPP TS 33.127 version 15.4.0 Release 15 6 ETSI TS 133 127 V15.4.0 (2020-04)
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 cont
...