3 Definitions, symbols and abbreviations
33.1273GPPLawful Interception (LI) architecture and functionsRelease 18TS
3.1 Definitions
For the purposes of the present document, the terms and definitions given in 3GPP TR 21.905 [1] and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in 3GPP TR 21.905 [1].
Content of Communication (CC): The content of communication as forwarded from the Mediation and Delivery Function 3 (over the LI_HI3 interface) to the Law Enforcement Monitoring Facility.
Control Plane (CP) Entity: The network elements or network functions responsible for handling the Control Plane Functions. These include the SGW and PGW in EPS without CUPS, the SGW-C and PGW-C in EPS with CUPS and the SMF in 5GS.
CUPS: As defined in 3GPP TS 23.214 [12], represents PLMN with architecture enhancements for control and user plane separation of EPC nodes.
Intercept Related Information (IRI): The intercept related information as forwarded from the Mediation and Delivery Function 2 (over the LI_HI2 interface) to the Law Enforcement Monitoring Facility.
IRI event: The network procedure or event that created an xIRI in the Point Of Interception.
LI component: The function and equipment involved in handling the Lawful Interception functionality in the CSP’s network.
Lawful Interception Identifier (LIID): Unique identifier that associates a warrant to Lawful Interception Product delivered by the CSP to the LEA.
LI system: The collection of all LI components involved in handling the Lawful Interception functionality in the CSP’s network.
Non-3GPP Access Entity (N3A Entity): The network functions responsible for interworking between 3GPP Core Network Functions and Non-3GPP access networks. These include TWIF, TNGF, N3IWF and W-AGF.
Non-local ID: An identity assigned and managed at a different CSP than the CSP performing LI.
Provisioning: The action taken by the CSP to provide its Lawful Interception functions information that identifies the target and the specific communication services of interest to the LEA, sourced from the LEA provided warrant.
Triggering: The action taken by a dedicated function (Triggering Function) to provide another dedicated function (Triggered POI), that Provisioning could not directly be applied to, with information that identifies the specific target communication to be intercepted.
User Plane (UP) Entity: The network elements or network functions responsible for handling the User Plane Functions. These include the SGW and PGW in EPS without CUPS, the SGW-U and PGW-U in EPS with CUPS and the UPF in 5GS.
Warrant: The formal mechanism to require Lawful Interception from a LEA served to the CSP on a single target identifier. Depending on jurisdiction also known as: intercept request, intercept order, lawful order, court order, lawful order or judicial order (in association with supporting legislation).
xCC: The content of communication as forwarded from the Point Of Interception (over the LI_X3) interface to the Mediation and Delivery Function 3.
xIRI: The intercept related information as forwarded from the Point Of Interception (over the LI_X2) interface to the Mediation and Delivery Function 2.
3.2 Symbols
3.3 Abbreviations
For the purposes of the present document, the abbreviations given in 3GPP TR 21.905 [1] and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in 3GPP TR 21.905 [1].
5GC 5G Core Network
5GMS 5G Media Streaming
5GS 5G System
AAnF AKMA Anchor Function
AC Application Client
ACR Application Context Relocation
ADMF LI Administration Function
AF Application Function
AF_ID Application Function Identity
AKA Authentication and Key Agreement
A-KID AKMA Key IDentifier
AKMA Authentication and Key Management for Applications
AMF Access and Mobility Management Function
AS Application Server
AUSF Authentication Server Function
BBIFF Bearer Binding Intercept and Forward Function
BSS Business Support System
CAG Closed Access Group
CC Content of Communication
CP Control Plane
CPIM Common Presence and Instant Messaging
CPS Call Placement Service
CSI Cell Supplemental Information
CSP Communication Service Provider
CUPS Control and User Plane Separation
DN Data Network
DNAI Data Network Access Identifier
DoNAS Data over NAS
EAP Extensible Authentication Protocol
EAS Edge Application Server
eCNAM Enhanced Calling Name
ECSP Edge Computing Service Provider
E-CSCF Emergency – Call Session Control Function
EDN Edge Data Network
EEC Edge Enabler Client
EECID Edge Enabler Client IDentifier
EES Edge Enabler Server
GPSI Generic Public Subscription Identifier
HMEE Hardware Mediated Execution Enclave
HR Home Routed
IBCF Interconnection Border Control Functions
ICF Identity Caching Function
IEF Identity Event Function
IMS-AGW IMS Access Gateway
IM-MGW IM Media Gateway
IP Interception Product
IQF Identity Query Function
IRI Intercept Related Information
KAF AKMA Application Key
KAKMA AKMA Anchor Key
KID Key IDentifier
KLI Decryption key(s) for services encrypted by CSP-provided keys
KSF Key Server Function
LAF Location Acquisition Function
LALS Lawful Access Location Services
LARF Location Acquisition Requesting Function
LBO Local Break Out
LEA Law Enforcement Agency
LEMF Law Enforcement Monitoring Facility
LI Lawful Interception
LI CA Lawful Interception Certificate Authority
LICF Lawful Interception Control Function
LI_HI1 Lawful Interception Handover Interface 1
LI_HI2 Lawful Interception Handover Interface 2
LI_HI3 Lawful Interception Handover Interface 3
LI_HI4 Lawful Interception Handover Interface 4
LI_HILA Lawful Interception Handover Interface Location Acquisition
LI_HIQR Lawful Interception Handover Interface Query Response
LIID Lawful Interception Identifier
LIPF Lawful Interception Provisioning Function
LIR Location Immediate Request
LI_SI Lawful Interception System Information Interface
LISSF Lawful Interception State Storage Function
LI_ST Lawful Interception State Transfer Interface
LI_T1 Lawful Interception Internal Triggering Interface 1
LI_T2 Lawful Interception Internal Triggering Interface 2
LI_T3 Lawful Interception Internal Triggering Interface 3
LI_X0 Lawful Interception Internal Interface 0
LI_X1 Lawful Interception Internal Interface 1
LI_X2 Lawful Interception Internal Interface 2
LI_X2_LA Lawful Interception Internal Interface 2 Location Acquisition
LI_X3 Lawful Interception Internal Interface 3
LI_X3A Lawful Interception Internal Interface 3 Aggregator
LI_XEM1 Lawful Interception Internal Interface Event Management Interface 1
LI_XER Lawful Interception Internal Interface Event Record
LI_XLA Lawful Interception Internal Interface Location Acquisition
LI_XQR Lawful Interception Internal Interface Query Response
LMF Location Management Function
LMISF LI Mirror IMS State Function
LMISF-CC LMISF for the handling of CC
LMISF-IRI LMISF for the handling of IRI
LTF Location Triggering Function
MA Multi-Access
MANO Management and Orchestration
MDF Mediation and Delivery Function
MDF2 Mediation and Delivery Function 2
MDF3 Mediation and Delivery Function 3
MRFP Multimedia Resource Function Processor
MSRP Message Session Relay Protocol
N3A Non-3GPP Access
N3IWF Non 3GPP Inter Working Function
N9HR N9 Home Routed
NAS Non-Access Stratum
NCGI NR Cell Global Identity
NEF Network Exposure Function
NFV Network Function Virtualisation
NFVI Network Function Virtualisation Infrastructure
NFVO Network Function Virtualisation Orchestrator
NIDD Non-IP Data Delivery
NPLI Network Provided Location Information
NR New Radio
NRF Network Repository Function
NSSF Network Slice Selection Function
OSS Operations Support System
PAG POI Aggregator
PCF Policy Control Function
P-CSCF Proxy – Call Session Control Function
PEI Permanent Equipment Identifier
PGW PDN Gateway
PGW-C PDN Gateway Control Plane
PGW-U PDN Gateway User Plane
POI Point Of Interception
PLMN Public Land Mobile Network
PTC Push to Talk over Cellular
RCD Rich Call Data
RCS Rich Communication Suite
S8HR S8 Home Routed
SCEF Service Capability Exposure Function
SCS Service Capability Server
SGW Serving Gateway
SGW-C Serving Gateway Control Plane
SGW-U Serving Gateway User Plane
SHAKEN Signature-based Handling of Asserted information using toKENs
SIRF System Information Retrieval Function
S-CSCF Serving – Call Session Control Function
SIP Session Initiation Protocol
SMF Session Management Function
SMSF SMS-Function
STF Security Terminating Function
STIR Secure Telephony Identity Revisited
SUCI Subscriber Concealed Identifier
SUPI Subscriber Permanent Identifier
TAI Tracking Area Identity
TF Triggering Function
TLS Transport Layer Security
TNGF Trusted Non-3GPP Gateway Function
TrGW Transit Gateway
TWIF Trusted WLAN Interworking Function
UDM Unified Data Management
UDR Unified Data Repository
UDSF Unstructured Data Storage Function
UPF User Plane Function
VNF Virtual Network Function
VNFC Virtual Network Function Component
W-AFG Wireline Access Gateway Function
xCC LI_X3 Content of Communication
xIRI LI_X2 Intercept Related Information