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Content for  TS 33.128  Word version:  16.3.0

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0  IntroductionWord‑p. 6
The present document has been produced by the 3GPP TSG SA to standardise Lawful Interception of telecommunications. The present document describes protocols and procedures for Lawful Interception based on 3GPP specifications. These protocols and procedures cover both internal 3GPP interfaces (those required to intercept communications and manage interception within a 3GPP network) and external handover interfaces (those used for delivery of intercepted communications to Law Enforcement, or handling of warrants).
Lawful Interception needs to be done in accordance with the applicable national or regional laws and technical regulations. Such national laws and regulations define the extent to which capabilities in the present document are applicable in specific jurisdictions.
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1  ScopeWord‑p. 7
The present document specifies the protocols and procedures required to perform Lawful Interception within a 3GPP network. The present document addresses both internal interfaces used internally with a 3GPP network and external handover interfaces used to handover intercepted communications to law enforcement.
The present document describes the detailed targeting of communications in each point of interception within a 3GPP network and the information that a point of interception needs to be able to capture. Furthermore, the detailed data formats for both the internal and external interfaces are also defined.
National regulations determine the applicable set of information that needs to be handed over or excluded from handover to law enforcement for a given 3GPP operator service.
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2  References

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
  • References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific.
  • For a specific reference, subsequent revisions do not apply.
  • For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
[1]  TR 21.905   "Vocabulary for 3GPP Specifications".
[2]  TS 23.501   "System Architecture for the 5G System".
[3]  TS 33.126   "Lawful Interception Requirements".
[4]  TS 23.502   "Procedures for the 5G System; Stage 2".
[5]  TS 33.127   "Lawful Interception (LI) Architecture and Functions".
[6]  ETSI TS 103 120: " Lawful Interception (LI); Interface for warrant information".
[7]  ETSI TS 103 221-1: "Lawful Interception (LI); Internal Network Interfaces; Part 1: X1".
[8]  ETSI TS 103 221-2: "Lawful Interception (LI); Internal Network Interfaces; Part 2: X2/X3".
[9] ETSI TS 102 232-1: "Lawful Interception (LI); Handover Interface and Service-Specific Details (SSD) for IP delivery; Part 1: Handover specification for IP delivery".
[10]  ETSI TS 102 232-7: "Lawful Interception (LI); Handover Interface and Service-Specific Details (SSD) for IP delivery; Part 7: Service-specific details for Mobile Services".
[11]  TS 33.501   "Security Architecture and Procedures for the 5G System".
[12]  TS 33.108   "3G security; Handover interface for Lawful Interception (LI)".
[13]  TS 24.501   "Non-Access-Stratum (NAS) protocol for 5G System (5GS)".
[14]  TS 24.007   "Mobile radio interface signalling layer 3; General Aspects".
[15]  TS 29.244   "Interface between the Control Plane and the User Plane nodes".
[16]  TS 29.502   "5G System; Session Management Services; Stage 3".
[17]  TS 29.571   "5G System; Common Data Types for Service Based Interfaces; Stage 3".
[18]  TS 23.040   "Technical realization of the Short Message Service (SMS)".
[19]  TS 23.003   "Numbering, addressing and identification ".
[20]  OMA-TS-MLP-V3_5-20181211-C: "Open Mobile Alliance; Mobile Location Protocol, Candidate Version 3.5", https://www.openmobilealliance.org/release/MLS/V1_4-20181211-C/OMA-TS-MLP-V3_5-20181211-C.pdf.
[21]  TS 29.540   "5G System; SMS Services; Stage 3".
[22]  TS 29.518   "5G System; Access and Mobility Management Services; Stage 3".
[23]  TS 38.413   "NG Application Protocol (NGAP)".
[24]  TS 29.572   "Location Management Services; Stage 3".
[25]  TS 29.503   "5G System; Unified Data Management Services".
[26]  RFC 815:  "IP DATAGRAM REASSEMBLY ALGORITHMS".
[27]  RFC 2460:  "Internet Protocol, Version 6 (IPv6) Specification".
[28]  RFC 793:  "TRANSMISSION CONTROL PROTOCOL".
[29]  RFC 768:  "User Datagram Protocol".
[30]  RFC 4340:  "Datagram Congestion Control Protocol (DCCP)".
[31]  RFC 4960:  "Stream Control Transmission Protocol".
[32]  IANA (www.iana.org): Assigned Internet Protocol Numbers, "Protocol Numbers".
[33]  RFC 6437:  "IPv6 Flow Label Specification".
[34]  RFC 791:  "Internet Protocol".
[35]  Open Geospatial Consortium OGC 05-010: "URNs of definitions in ogc namespace".
[36]  TS 33.107   "3G security; Lawful interception architecture and functions".
[37]  TS 37.340   "Evolved Universal Radio Access (E-UTRA) and NR-Multi-connectivity; Stage 2".
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3  Definitions, symbols and abbreviationsWord‑p. 8

3.1  Definitions

For the purposes of the present document, the terms and definitions given in TR 21.905 and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905.

3.2  Symbols

For the purposes of the present document, the following symbols apply:
<symbol> <Explanation>

3.3  AbbreviationsWord‑p. 9
For the purposes of the present document, the abbreviations given in TR 21.905 and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905.
ADMF
LI Administration Function
CC
Content of Communication
CSP
Communication Service Provider
CUPS
Control and User Plane Separation
IRI
Intercept Related Information
LALS
Lawful Access Location Services
LEA
Law Enforcement Agency
LEMF
Law Enforcement Monitoring Facility
LI
Lawful Interception
LICF
Lawful Interception Control Function
LI_HI1
LI_Handover Interface 1
LI_HI2
LI_Handover Interface 2
LI_HI3
LI_Handover Interface 3
LI_HI4
LI_Handover Interface 4
LIPF
Lawful Interception Provisioning Function
LIR
Location Immediate Request
LI_SI
Lawful Interception System Information Interface
LI_X1
Lawful Interception Internal Interface 1
LI_X2
Lawful Interception Internal Interface 2
LI_X3
Lawful Interception Internal Interface 3
LTF
Location Triggering Function
MDF
Mediation and Delivery Function
MDF2
Mediation and Delivery Function 2
MDF3
Mediation and Delivery Function 3
NPLI
Network Provided Location Information
O&M
Operations and Management
POI
Point Of Interception
SIRF
System Information Retrieval Function
SOI
Start Of Interception
TF
Triggering Function
xCC
LI_X3 Communications Content.
xIRI
LI_X2 Intercept Related Information
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