ETSI TS 133 128 V16.15.0 (2023-06)

Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; 5G; Security; Protocol and procedures for Lawful Interception (LI); Stage 3 (3GPP TS 33.128 version 16.15.0 Release 16)

RTS/TSGS-0333128vgf0

General Information

• Status: Not Published
• Technical Committee: 3GPP SA 3 - Security
• Current Stage: 8 - Draft receipt by ETSI Secretariat
• Completion Date: 23-Jun-2023

Standards Content (Sample)

ETSI TS 133 128 V16.15.0 (2023-07)
TECHNICAL SPECIFICATION
Digital cellular telecommunications system (Phase 2+) (GSM);
Universal Mobile Telecommunications System (UMTS);
LTE;
5G;
Security;
Protocol and procedures for Lawful Interception (LI);
Stage 3
(3GPP TS 33.128 version 16.15.0 Release 16)
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3GPP TS 33.128 version 16.15.0 Release 16 1 ETSI TS 133 128 V16.15.0 (2023-07)
Reference
RTS/TSGS-0333128vgf0
Keywords
5G,GSM,LTE,UMTS
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ETSI
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3GPP TS 33.128 version 16.15.0 Release 16 2 ETSI TS 133 128 V16.15.0 (2023-07)
Intellectual Property Rights
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DECT™, PLUGTESTS™, UMTS™ and the ETSI logo are trademarks of ETSI registered for the benefit of its

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Legal Notice

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ETSI
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3GPP TS 33.128 version 16.15.0 Release 16 3 ETSI TS 133 128 V16.15.0 (2023-07)
Contents

Intellectual Property Rights ................................................................................................................................ 2

Legal Notice ....................................................................................................................................................... 2

Modal verbs terminology .................................................................................................................................... 2

Foreword ............................................................................................................................................................. 8

Introduction ........................................................................................................................................................ 8

1 Scope ........................................................................................................................................................ 9

2 References ................................................................................................................................................ 9

3 Definitions, symbols and abbreviations ................................................................................................. 11

3.1 Definitions ........................................................................................................................................................ 11

3.2 Symbols ............................................................................................................................................................ 11

3.3 Abbreviations ................................................................................................................................................... 11

4 General ................................................................................................................................................... 12

4.1 Introduction ...................................................................................................................................................... 12

4.2 Basic principles for internal interfaces ............................................................................................................. 13

4.3 Basic principles for external handover interfaces ............................................................................................. 14

4.4 Service scoping ................................................................................................................................................ 15

4.4.1 General ........................................................................................................................................................ 15

4.4.2 CSP service type ......................................................................................................................................... 15

4.4.3 Delivery type .............................................................................................................................................. 15

4.4.4 Location Reporting ..................................................................................................................................... 15

4.4.5 LALS Triggering ........................................................................................................................................ 15

4.4.6 Roaming Interception ................................................................................................................................. 16

5 Transport and Communications Protocol ............................................................................................... 16

5.1 General ............................................................................................................................................................. 16

5.2 Protocols for LI_X1 and LI_T interfaces ......................................................................................................... 16

5.2.1 General usage of ETSI TS 103 221-1 ......................................................................................................... 16

5.2.2 Usage for realising LI_X1 .......................................................................................................................... 16

5.2.3 Usage for realising LI_X1 (management) .................................................................................................. 17

5.2.4 Service scoping ........................................................................................................................................... 17

5.2.5 Usage for realising LI_T2 ........................................................................................................................... 17

5.2.6 Usage for realising LI_T3 ........................................................................................................................... 17

5.2.7 Usage for realising LI_XEM1 .................................................................................................................... 18

5.3 Protocols for LI_X2 and LI_X3 ....................................................................................................................... 19

5.3.1 General usage of ETSI TS 103 221-2 ......................................................................................................... 19

5.3.2 Usage for realising LI_X2 .......................................................................................................................... 19

5.3.3 Usage for realising LI_X3 .......................................................................................................................... 19

5.3.4 Service scoping ........................................................................................................................................... 20

5.4 Protocols for LI_HI1 ........................................................................................................................................ 20

5.4.1 General ........................................................................................................................................................ 20

5.4.2 Service scoping ........................................................................................................................................... 20

5.5 Protocols for LI_HI2 and LI_HI3 ..................................................................................................................... 20

5.5.1 General ........................................................................................................................................................ 20

5.5.2 Usage for realising LI_HI2 ......................................................................................................................... 20

5.5.3 Usage for realising LI_HI3 ......................................................................................................................... 20

5.5.4 Service scoping ........................................................................................................................................... 21

5.5.5 IRI Target Identifiers .................................................................................................................................. 21

5.6 Protocols for LI_HI4 ........................................................................................................................................ 21

5.6.1 General ........................................................................................................................................................ 21

5.6.2 Usage for realising LI_HI4 ......................................................................................................................... 21

5.7 Protocols for LI_HIQR ..................................................................................................................................... 22

5.7.1 General ........................................................................................................................................................ 22

5.7.2 Usage for realising LI_HIQR...................................................................................................................... 22

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3GPP TS 33.128 version 16.15.0 Release 16 4 ETSI TS 133 128 V16.15.0 (2023-07)

5.7.2.1 Request structure ................................................................................................................................... 22

5.7.2.2 Request parameters ............................................................................................................................... 23

5.7.2.3 Response structure ................................................................................................................................ 23

5.8 Protocols for LI_XQR ...................................................................................................................................... 25

5.8.1 General ........................................................................................................................................................ 25

5.8.2 Identity association requests ....................................................................................................................... 25

5.8.3 Ongoing identity association requests......................................................................................................... 25

5.9 Protocols for LI_XER ...................................................................................................................................... 26

5.10 Protocols for LI_ST interface ........................................................................................................................... 26

5.10.1 Overview .................................................................................................................................................... 26

5.10.2 Storage ........................................................................................................................................................ 26

5.10.3 Retrieval ...................................................................................................................................................... 26

5.10.4 Removal ...................................................................................................................................................... 26

6 Network Layer Based Interception ......................................................................................................... 27

6.1 Introduction ...................................................................................................................................................... 27

6.2 5G ..................................................................................................................................................................... 27

6.2.1 General ........................................................................................................................................................ 27

6.2.2 LI at AMF ................................................................................................................................................... 27

6.2.2.1 Provisioning over LI_X1 ....................................................................................................................... 27

6.2.2.2 Generation of xIRI over LI_X2 ............................................................................................................. 28

6.2.2.2.1 General ............................................................................................................................................ 28

6.2.2.2.2 Registration ..................................................................................................................................... 28

6.2.2.2.3 Deregistration .................................................................................................................................. 29

6.2.2.2.4 Location update ............................................................................................................................... 30

6.2.2.2.5 Start of interception with registered UE .......................................................................................... 31

6.2.2.2.6 AMF unsuccessful procedure .......................................................................................................... 32

6.2.2.2.7 AMF identifier association .............................................................................................................. 33

6.2.2.3 Generation of IRI over LI_HI2 ............................................................................................................. 33

6.2.2.4 Identity privacy ..................................................................................................................................... 34

6.2.2A Identifier Reporting for AMF ..................................................................................................................... 34

6.2.2A.1 Activation of reporting over LI_XEM1 ................................................................................................ 34

6.2.2A.2 Generation of records over LI_XER ..................................................................................................... 34

6.2.2A.2.2 Association Events .......................................................................................................................... 35

6.2.2A.2.3 Transmission to the ICF .................................................................................................................. 36

6.2.3 LI for SMF/UPF ......................................................................................................................................... 36

6.2.3.1 Provisioning over LI_X1 ....................................................................................................................... 36

6.2.3.1.1 General ............................................................................................................................................ 36

6.2.3.1.2 Provisioning of the IRI-POI, IRI-TF and CC-TF in the SMF ......................................................... 36

6.2.3.1.3 Provisioning of the MDF2 ............................................................................................................... 37

6.2.3.1.4 Provisioning of the MDF3 ............................................................................................................... 38

6.2.3.2 Generation of xIRI at IRI-POI in SMF over LI_X2 .............................................................................. 39

6.2.3.2.1 General ............................................................................................................................................ 39

6.2.3.2.2 PDU session establishment .............................................................................................................. 39

6.2.3.2.3 PDU session modification ............................................................................................................... 40

6.2.3.2.4 PDU session release ........................................................................................................................ 42

6.2.3.2.5 Start of interception with an established PDU session .................................................................... 42

6.2.3.2.6 SMF unsuccessful procedure ........................................................................................................... 44

6.2.3.2.7 MA PDU sessions............................................................................................................................ 45

6.2.3.2.8 PDU to MA PDU session modification ........................................................................................... 55

6.2.3.3 Triggering of the CC-POI from CC-TF over LI_T3 ............................................................................. 56

6.2.3.3.1 LI_T3 interface specifics ................................................................................................................. 56

6.2.3.3.2 CC interception with multi-homed PDU session ............................................................................. 57

6.2.3.3.3 CC Interception only at PDU Session Anchor UPFs ....................................................................... 58

6.2.3.4 IRI-POI in UPF triggering over LI_T2 ................................................................................................. 58

6.2.3.5 Generation of xIRI at UPF over LI_X2................................................................................................. 59

6.2.3.5.1 Packet data header reporting ............................................................................................................ 59

6.2.3.5.2 Fragmentation .................................................................................................................................. 60

6.2.3.5.3 Packet Data Header Reporting (PDHR) .......................................................................................... 60

6.2.3.5.4 Packet Data Summary Reporting (PDSR) ....................................................................................... 62

6.2.3.6 Generation of xCC at CC-POI in the UPF over LI_X3 ......................................................................... 64

6.2.3.7 Generation of IRI over LI_HI2 ............................................................................................................. 64

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3GPP TS 33.128 version 16.15.0 Release 16 5 ETSI TS 133 128 V16.15.0 (2023-07)

6.2.3.8 Generation of CC over LI_HI3 ............................................................................................................. 65

6.2.3.9 Packet Data Information Reporting ....................................................................................................... 65

6.2.3.10 Sharing LI state information over LI_ST .............................................................................................. 66

6.2.3.10.1 Overview ......................................................................................................................................... 66

6.2.3.10.2 Storing LI state ................................................................................................................................ 66

6.2.3.10.3 Retrieving LI state ........................................................................................................................... 67

6.2.3.10.4 Removing LI state ........................................................................................................................... 67

6.2.4 LI at UDM for 5G ....................................................................................................................................... 68

6.2.4.1 General description ............................................................................................................................... 68

6.2.5 LI at SMSF ................................................................................................................................................. 68

6.2.5.1 Provisioning over LI_X1 ....................................................................................................................... 68

6.2.5.2 Generation of xIRI over LI_X2 ............................................................................................................. 69

6.2.5.3 SMS Message ........................................................................................................................................ 69

6.2.5.4 Generation of IRI over LI_HI2 ............................................................................................................. 72

6.2.6 LI support at NRF ....................................................................................................................................... 72

6.3 4G ..................................................................................................................................................................... 72

6.3.1 General ........................................................................................................................................................ 72

6.3.2 LI at MME .................................................................................................................................................. 73

6.3.2.1 Provisioning over LI_X1 ....................................................................................................................... 73

6.3.2.2 Generation of xIRI over LI_X2 ............................................................................................................. 73

6.3.2.2.1 General ............................................................................................................................................ 73

6.3.2.2.2 MME identifier association ............................................................................................................. 73

6.3.2.3 Generation of IRI over LI_HI2 ............................................................................................................. 74

6.3.3 LI at SGW/PGW and ePDG ....................................................................................................................... 74

6.3.3.1 Provisioning over LI_X1 ....................................................................................................................... 74

6.3.3.2 Generation of xIRI over LI_X2 ............................................................................................................. 74

6.3.3.3 Generation of xCC at CC-POI in the SGW/PGW and ePDG over LI_X3 ............................................ 75

6.3.3.4 Generation of IRI over LI_HI2 ............................................................................................................. 75

6.3.3.5 Generation of CC over LI_HI3 ............................................................................................................. 75

6.4 3G ..................................................................................................................................................................... 75

7 Service Layer Based Interception ........................................................................................................... 76

7.1 Introduction ...................................................................................................................................................... 76

7.2 Central Subscriber Management ........................................
...