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TS 33.128 SA3 ★
Protocol and Procedures for Lawful Interception

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V16.1.0 (Wzip) 2019/12 66 p.

V15.3.0 (PDF) 2019/12 69 p.

Rapporteur: Mr. Rao, Nagaraja

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.

full Table of Contents for TS 33.128 Word version: 16.1.0

1 Scope Word-p. 7

3 Definitions, symbols and abbreviations Word-p. 8

3.1 Definitions

3.3 Abbreviations

4 General Word-p. 9

4.1 Introduction

4.2 Basic principles for internal interfaces Word-p. 10

4.3 Basic principles for external handover interfaces Word-p. 11

5 Transport and Communications Protocol

5.2 Protocols for LI_X1 and LI_T interfaces

5.2.1 General usage of ETSI TS 103 221-1

5.2.2 Usage for realising LI_X1 Word-p. 12

5.2.3 Usage for realising LI_X1 (management)

5.2.4 Service scoping

5.2.4.1 General

5.2.4.2 CSP service type

5.2.4.3 Interception type

5.2.4.4 Location

5.2.4.5 Roaming Word-p. 13

5.2.5 Usage for realising LI_T2

5.2.6 Usage for realising LI_T3

5.3 Protocols for LI_X2 and LI_X3

5.3.1 General usage of ETSI TS 103 221-2

5.3.2 Usage for realising LI_X2

5.3.3 Usage for realising LI_X3

5.4 Protocols for LI_HI1 Word-p. 14

5.5 Protocols for LI_HI2 and LI_HI3

5.5.2 Usage for realising LI_HI2

5.5.3 Usage for realising LI_HI3

5.6 Protocols for LI_HI4

5.6.2 Usage for realising LI_HI4

6 Network Layer Based Interception Word-p. 15

6.1 Introduction

6.2.2 LI at AMF

6.2.2.1 Provisioning over LI_X1

6.2.2.2 Generation of xIRI over LI_X2

6.2.2.2.1 General

6.2.2.2.2 Registration

6.2.2.2.3 Deregistration Word-p. 16

6.2.2.2.4 Location update Word-p. 17

6.2.2.2.5 Start of interception with registered UE Word-p. 18

6.2.2.2.6 AMF unsuccessful procedure Word-p. 19

6.2.2.3 Generation of IRI over LI_HI2 Word-p. 20

6.2.2.4 Identity privacy

6.2.3 LI for SMF/UPF

6.2.3.1 Provisioning of SMF over LI_X1

6.2.3.2 Generation of xIRI at IRI-POI in SMF over LI_X2 Word-p. 21

6.2.3.2.1 General

6.2.3.2.2 PDU session establishment

6.2.3.2.3 PDU session modification Word-p. 22

6.2.3.2.4 PDU session release Word-p. 23

6.2.3.2.5 Start of interception with an established PDU session

6.2.3.2.6 SMF unsuccessful procedure Word-p. 25

6.2.3.3 Triggering of the CC-POI from CC-TF over LI_T3

6.2.3.3.1 LI_T3 interface specifics

6.2.3.3.2 CC interception with multi-homed PDU session Word-p. 27

6.2.3.3.3 CC Interception only at PDU Session Anchor UPFs

6.2.3.4 IRI-POI in UPF triggering over LI_T2

6.2.3.5 Generation of xIRI at UPF over LI_X2 Word-p. 29

6.2.3.5.1 Packet data header reporting

6.2.3.5.2 Fragmentation

6.2.3.5.3 Packet Data Header Reporting (PDHR)

6.2.3.5.4 Packet Data Summary Reporting (PDSR) Word-p. 31

6.2.3.6 Generation of xCC at CC-POI in the UPF over LI_X3 Word-p. 32

6.2.3.7 Generation of IRI over LI_HI2

6.2.3.8 Generation of CC over LI_HI3

6.2.3.9 Packet Data Information Reporting at MDF2

6.2.4 LI at UDM for 5G Word-p. 33

6.2.4.1 General description

6.2.5 LI at SMSF

6.2.5.1 Provisioning over LI_X1

6.2.5.2 Generation of xIRI over LI_X2

6.2.5.3 SMS Message

6.2.5.4 Generation of IRI over LI_HI2 Word-p. 35

6.2.6 LI support at NRF

7 Service Layer Based Interception

7.1 Introduction

7.2 Central Subscriber Management

7.2.1 General description

7.2.2 LI at UDM

7.2.2.1 General description

7.2.2.2 Provisioning over LI_X1 Word-p. 36

7.2.2.3 Generation of xIRI over LI_X2

7.2.2.3.1 General description

7.2.2.3.2 Serving system

7.2.2.3.3 Subscriber record change

7.2.2.3.4 Cancel location

7.2.2.3.5 Location information request

7.2.2.4 Generation of IRI over LI_HI2 Word-p. 37

7.2.3 LI at HSS

7.3.1 Lawful Access Location Services (LALS)

7.3.1.1 General description

7.3.1.2 Provisioning over LI_X1

7.3.1.2.1 Target positioning service

7.3.1.2.2 Triggered location service Word-p. 38

7.3.1.3 Triggering over LI_T2 Word-p. 39

7.3.1.4 Generation of xIRI over LI_X2

7.3.1.5 Generation of IRI over LI_HI2 Word-p. 40

7.3.2 Cell database information reporting

7.3.2.1 General description

7.3.2.2 Delivery of cell site information over LI_HI2

7.3.3 Use of the Location structure [R16]

7.3.3.1 General description

A (Normative) Structure of both the Internal and External Interfaces Word-p. 41

B (Normative) LI Notification Word-p. 58

C (Normative) XSD Schema for LI_X1 extensions Word-p. 59

D Drafting Guidance Word-p. 63

D.1 Introduction

D.2 Drafting conventions

D.3 Naming conventions

D.4 ASN.1 Syntax conventions Word-p. 64

Z Change history Word-p. 66