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TS 33.127  SA3 ★
Lawful Interception Architecture and Functions

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V16.2.0 (Wzip)  2019/12  80 p.
V15.3.0 (PDF)  2019/09  55 p.
Rapporteur:  Mr. Jaspers, Koen
The present document specifies both the architectural and functional system requirements for Lawful Interception (LI) in 3GPP networks. The present document provides an LI architecture supporting both network layer based and service layer based Interception.
National regulations determine the specific set of LI functional capabilities that are applicable to a specific 3GPP operator deployment.

full Table of Contents for  TS 33.127  Word version:   16.2.0

Here   Top
1  Scope  Word-p. 8
2  References
3  Definitions, symbols and abbreviations  Word-p. 9
3.1  Definitions
3.2  Symbols  Word-p. 10
3.3  Abbreviations
4  Requirements realisation  Word-p. 11
5  Functional architecture
5.1  General
5.2  High-level generic LI architecture  Word-p. 12
5.3  Functional entities  Word-p. 13
5.3.1  Law Enforcement Agency (LEA)
5.3.2  Point of Interception (POI)
5.3.2.1  General
5.3.2.2  Directly provisioned and triggered POIs
5.3.2.3  IRI-POIs and CC-POIs
5.3.2.4  Failure handling
5.3.3  Triggering Function
5.3.4  Mediation and Delivery Function (MDF)  Word-p. 14
5.3.5  Administrative Function (ADMF)
5.3.5.1  General  Up
5.3.5.2  LICF  Word-p. 15
5.3.5.3  LIPF
5.3.6  System Information Retrieval Function (SIRF)
5.3.7  LEMF - Law Enforcement Monitoring Facility  Word-p. 16
5.4  LI interfaces
5.4.1  General
5.4.2  Interface LI_SI  Word-p. 17
5.4.3  Interface LI_HI1
5.4.4  Interface LI_X1
5.4.4.1  General  Up
5.4.4.2  LIPF and POI
5.4.4.3  LIPF and TF  Word-p. 18
5.4.4.4  LIPF and MDF2/MDF3
5.4.5  Interface LI_X2
5.4.6  Interface LI_X3
5.4.7  Interface LI_T  Word-p. 19
5.4.7.1  General
5.4.7.2  Interface LI_T2
5.4.7.3  Interface LI_T3
5.4.8  Interface LI_HI2  Up
5.4.9  Interface LI_HI3
5.4.10  Interface LI_HI4  Word-p. 20
5.4.10.1  General
5.4.10.2  LI operation notification
5.4.10.3  Contents of the notification
5.4.11  Interface LI_ADMF
5.4.12  Interface LI_MDF
5.5  LI service discovery
5.6  LI in a virtualised environment  Word-p. 21
5.6.1  General  Up
5.6.2  Virtualised deployment architecture
5.6.3  LI function instantiation and lifecycle management procedures [R16]  Word-p. 23
5.6.3.1  Controller virtualisation layer and MANO procedures
5.6.3.1.1  Responsibilities
5.6.3.1.2  General procedures
5.6.3.1.3  Instantiation
5.6.3.1.4  Modification
5.6.3.1.5  Termination
5.6.3.2  LI_X0 procedures  Word-p. 24
5.6.3.3  Exception Procedures  Word-p. 25
6  Network layer based interception
6.1  General
6.2  5G  Word-p. 26
6.2.1  General
6.2.2  LI at AMF  Word-p. 27
6.2.2.1  Architecture
6.2.2.2  Target identities  Word-p. 28
6.2.2.3  Identity privacy  Word-p. 29
6.2.2.4  IRI events
6.2.2.5  Common IRI parameters  Up
6.2.2.6  Specific IRI parameters  Word-p. 30
6.2.2.7  Network topologies
6.2.3  LI for SMF/UPF
6.2.3.1  Architecture
6.2.3.2  Target identities  Word-p. 32
6.2.3.3  IRI events  Word-p. 33
6.2.3.4  Common IRI parameters
6.2.3.5  Specific IRI parameters
6.2.3.6  Network topologies
6.2.4  LI at UDM for 5G  Word-p. 34
6.2.5  LI at SMSF
6.2.5.1  Architecture
6.2.5.2  Target identities  Word-p. 35
6.2.5.3  IRI events  Word-p. 36
6.2.5.4  Common IRI parameters
6.2.5.5  Specific IRI parameters
6.2.5.6  Network topologies
6.2.6  LI support at NRF
6.2.6.1  Architecture
6.2.6.2  LI_SI notifications  Word-p. 37
6.2.6.3  LI_SI parameters
6.2.7  External data storage  Word-p. 38
6.3  EPC
6.3.1  General [R16]
6.3.2  LI at the MME [R16]
6.3.2.1  Architecture
6.3.2.2  Target identities  Word-p. 39
6.3.2.3  IRI events
6.3.2.4  Common IRI parameters
6.3.2.5  Specific IRI parameters  Word-p. 40
6.3.2.6  Network topologies
6.3.3  LI at SGW/PGW [R16]
6.3.3.1  Architecture
6.3.3.2  Target identities  Word-p. 42
6.3.3.3  IRI events
6.3.3.4  Common IRI parameters
6.3.3.5  Specific IRI parameters
6.3.3.6  Network topologies
6.3.4  LI at ePDG [R16]  Word-p. 43
6.3.4.1  Architecture  Up
6.3.4.2  Target identities  Word-p. 44
6.3.4.3  IRI events
6.3.4.4  Common IRI parameters  Word-p. 45
6.3.4.5  Specific IRI parameters
6.3.4.6  Network topologies
6.4  3G
6.5  VoNR
6.6  4G/5G Interworking [R16]  Word-p. 46
7  Service layer based interception
7.1  General  Up
7.2  Central subscriber management
7.2.1  General
7.2.2  LI at UDM  Word-p. 47
7.2.2.1  Architecture
7.2.2.2  Target identities  Word-p. 48
7.2.2.3  Identity privacy
7.2.2.4  IRI events
7.2.2.5  Common IRI parameters
7.2.2.6  Specific IRI parameters  Word-p. 49
7.2.2.7  Network topologies  Up
7.2.3  LI at HSS
7.3  Location
7.3.1  General
7.3.2  Service usage location reporting
7.3.2.1  General
7.3.2.2  Embedded location reporting
7.3.2.3  Separated location reporting
7.3.3  Lawful Access Location Services (LALS)  Word-p. 50
7.3.3.1  General
7.3.3.2  Target positioning  Word-p. 51
7.3.3.2.1  General
7.3.3.2.2  Immediate location provision
7.3.3.2.3  Periodic location provision
7.3.3.3  Triggered location
7.3.3.4  LI_X2 interface for target positioning and triggered location  Word-p. 53
7.3.4  Cell database information reporting
7.4  IMS  Word-p. 54
7.4.1  General [R16]
7.4.2  Architecture [R16]  Word-p. 55
7.4.2.1  Overview  Up
7.4.2.2  Target identities  Word-p. 56
7.4.2.3  Target identification  Word-p. 57
7.4.3  IRI-POI [R16]
7.4.3.1  General
7.4.3.2  IRI events
7.4.3.3  Common IRI parameters  Word-p. 58
7.4.3.4  Specific IRI parameters
7.4.4  CC-TF and CC-POI [R16]
7.4.4.1  General
7.4.4.2  CC intercept trigger  Up
7.4.4.3  Common CC parameters
7.4.5  Correlation of xCC and xIRI [R16]  Word-p. 59
7.4.6  Network topologies [R16]
7.4.6.1  General
7.4.6.2  IMS Network Functions providing the IRI-POI
7.4.6.3  IMS Network Functions providing the CC-TF and CC-POI functions  Word-p. 60
7.4.7  Roaming cases [R16]  Word-p. 62
7.4.7.1  Media unavailable in a roaming case
7.4.7.2  S8HR
7.4.7.3  N9HR  Up
7.4.7.4  LI in VPLMN with home-routed roaming architecture
7.4.7.4.1  Background
7.4.7.4.2  LI architecture
7.4.7.4.3  Target identifiers  Word-p. 63
7.4.7.4.4  Target identification
7.4.7.4.5  IRI events
7.4.7.4.6  IRI parameters
7.4.7.4.7  CC intercept trigger  Word-p. 64
7.4.7.4.8  CC parameters
7.4.7.4.9  Correlation of xCC and xIRI  Up
7.5  MMS [R16]
7.5.1  Overview
7.5.2  LI at MMS Proxy-Relay
7.5.2.1  Architecture
7.5.2.2  Target Identities
7.5.2.3  IRI Events  Word-p. 65
7.5.2.4  Common IRI parameters
7.5.2.5  Specific IRI parameters
7.5.2.6  CC
7.5.2.7  Network Topologies  Up
7.6  PTC service [R16]
7.6.1  General
7.6.2  Target identities  Word-p. 66
7.6.3  IRI events
7.6.4  Common IRI parameters  Word-p. 67
7.6.5  Specific IRI parameters
7.6.6  Common CC parameters
7.6.7  Specific CC parameters
7.6.8  Network topologies
8  LI security and deployment considerations  Up
8.1  Introduction
8.2  Architectural alternatives  Word-p. 68
8.2.1  Full target list at every POI node
8.2.2  Full target list only in LICF
8.2.3  Provisioning for registered users
8.3  LI key management at ADMF
8.3.1  General
8.3.2  Key management
8.4  Virtualised LI security  Word-p. 69
8.4.1  General  Up
8.5  Points of Interception
8.6  Deployment considerations [R16]  Word-p. 70
8.6.1  General
8.6.2  CC-PAG
A  5G LI network topology views  Word-p. 72
A.1  Non-roaming scenario
A.1.1  General
A.1.2  Service-based representation with point-to-point LI system
A.2  Interworking with EPC/E-UTRAN  Word-p. 73
A.2.1  General  Up
A.2.2  Topology view for a non-roaming scenario  Word-p. 74
A.3  Multiple DN connections in a PDU session  Word-p. 76
A.3.1  General
A.3.2  Topology view for a non-roaming scenario
A.4  Non-3GPP access in a non-roaming scenario  Word-p. 78
A.4.1  General
A.4.2  Topology view
Z  Change history  Word-p. 80

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