Name: 3GPP SA 3 LI handling US and European needs

Text: 3GPP SA 3 LI handling US and European needs
Bernhard Spalt
Chair 3GPP SA 3 LI

Nokia Siemens Networks
Vienna, Austria

Company Confidential
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Bernhard Spalt / Sep. 2008

Content
!Structure of 3GPP
!General Concept
!Common IMS
!Dynamic triggering
" Questions
" Conclusion

!Back Up

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Bernhard Spalt / Sep. 2008

3rd Generation Partnership Project
Organizational Partners:
ARIB, CCSA, ETSI, ATIS, TTA, and TTC

ARIB
(Japan)

ATIS (USA)

CCSA
(China)

TTA
(Korea)
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Bernhard Spalt / Sep. 2008

TTC
(Japan)

Definition of the Third Generation Partnership
Project
3GPP will provide globally applicable Technical Specifications
for a 3rd Generation Mobile System based on the evolved GSM
core network, and the Universal Terrestrial Radio Access
(UTRA), to be transposed by relevant standardization bodies
(Organizational Partners) into appropriate deliverables (e.g.,
standards).

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Bernhard Spalt / Sep. 2008

TSG ORGANIZATION

Project Co­ordination Group
2PCG3
TSG GERAN

TSG RAN

GSM EDGE
Radio Access Network

Radio Access Networks

GERAN WG1

RAN WG1

Radio Aspects

Radio Layer 1
specification

GERAN WG2

RAN WG2

Protocol Aspects

GERAN WG3

Terminal Testing

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Company Confidential )4%127
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SA WG2

RAN WG3

SA WG3

Radio Performance &
Protocol Aspects

RAN WGL

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Services

Architecture

RAN WG4

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SA WG1

Radio Layer2 spec &
Radio Layer3 RR spec

lub spec lur spec lu spec &
UTRAN O&M requirements

CLOSED GROUPS

TSG SA

Services &
System Aspects

Mobile Terminal
Conformance Testing

Bernhard Spalt / Sep. 2008

Security

SA WG4
Codec

TSG CT

Core Network
& Terminals

CT WG1

MM/CC/SM 2lu3

CT WG3

Interworking with
External Networks

CT WG4

MAP/GTP/BCH/SS

CT WGV

Smart Card
Application Aspects

SA WGL

Telecom Management

!"#

General Concept
!

One document set as LI solution for 3GPP

!

National LI regulation could be done via one reference
" Clear structure of necessary functions

!

Include the common requirements of all 3GPP members

!

Detailed stage 2 definitions

!

Mainly based on access interception, but service
interception is already fixed for specific services

Company Confidential
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Bernhard Spalt / Sep. 2008

Specifications

! TS 33.106 Lawful Interception requirements
" Stage 1

! TS 33.107 Lawful Interception architecture and functions
" Stage 2

! TS 33.108 Handover interface for Lawful Interception
" Stage 3
" Based on / coordinated with ES 201 671 / TS 101 671

Company Confidential
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Bernhard Spalt / Sep. 2008

Common IMS LI
According to the agreement between TISPAN & 3GPP the IMS
definitions out of 3GPP will also be used by TISPAN.
IMS LI definitions have to be drafted in a way that also TISPAN
could use them.
Update of current specification is suffizient
Main question for LEAs: Who will fix the details for CC??
! dynamic triggering seems to be the solution

Company Confidential
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Bernhard Spalt / Sep. 2008

Dynamic triggering
General questions
1. LI could be activated within one domain within one country
2. LI could be activated within one domain
#on&' care abou' na'ional bor#ers

3. LI could be activated within one country,
domain / operator borders doesn't matter

4. LI could be activated at 'any' access server
no domain or border restriction

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Bernhard Spalt / Sep. 2008

1. LI could be activated within one domain within
one country
Current assumption within all LI concepts and standards.
Usual LEA behavior:
! 2ne 3arran' for 5o3n6 cus'omers
! Several warrants for all operators for roamers

Company Confidential
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Bernhard Spalt / Sep. 2008

2. LI could be activated within one domain
!"#$%&'()*&(+",%(%-"#(.&+")!*)/
Operators still hope to get centralized services
Main problem:
" is it legal to send the target list out of the country ?
Solution within EU could be expected

Company Confidential
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Bernhard Spalt / Sep. 2008

3.LI could be activated within one country,
domain / operator borders doesn't matter
Legal question:
Could Operator 1 activate LI in the Operator 2 network?

"In this way quite dangerous!
German regulations already include this requirement, but no
technical details exist!!

"Get a solution involving the regulators
"trusted government organization
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4. LI could be activated at 'any' access server
no domain or border restriction
Practical question:
Could a SIP service provider (e.g. in India) offering this service
in Germany activate interception for CC within Germany??

Problems:
!Sending target info out of the intercepting country
!8o 9rela'ion5 be'3een IRI an# <!@ui'e #angerous for misuse by 5anybo#y6

"No technical solution seen,
"too many legal restrictions / problems
Company Confidential
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Bernhard Spalt / Sep. 2008

Dynamic triggering
Conclusion
If standardization fixes LI dynamic triggering solutions for
question 3, but no concepts for question 4!
Might / Will bring market / marketing advantages for operators
working based on question 4.
Expect statements (explicit or implicit):
Choose our service, you will not be intercepted !!
Worst case:
Operator will go out of the country to prevent LI

Company Confidential
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Bernhard Spalt / Sep. 2008

Contact

Bernhard Spalt
mailto:bernhard.spalt.ext@nsn.com
mailto:bernhard.spalt@siemens.com

Tel.: +43 51707 21474

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Access Interception
My usual s'a'emen'C 9De' i' a' 'Ee access or forge' i'5
Background:
!All information has to go via the access nodes
!No discussion where the service is executed and if the access
is possible at all
!If an UE is able to handle this, a Monitoring Center (MC) has to
support the same functionality

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Bernhard Spalt / Sep. 2008

Service Interception
!

Additional requirements for each service
" No clear situation where these services are created/executed

!
!
!
!

Additional LI functions for each service
Always detailed functions " no national regulation for
services
Access to service might be out of the national jurisdiction
"restriction for services usually not possible and also
not recommended
Cost consideration
" Seems to provide for a cheaper MC; but this is not true
" Expensive at the TSP side

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Bernhard Spalt / Sep. 2008

LI for conferencing
Whole chapter will become a national option, as the details
might conflict with national regulations.
Currently no CS LI requirements for conference server exists
All these details are fixed for SIP specific conferencing

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Bernhard Spalt / Sep. 2008

LI for conferencing (Fig)
Draft common architecture

X1_1
HI1

Mediation
Function

ADMF
AS/MRFC

X1_2
HI2

X2

Mediation
Function

LEMF

Delivery
Function 2
X1_3

HI3

X3

Mediation
Function

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Delivery
Function 3

Bernhard Spalt / Sep. 2008

MRFP

History
Alrea#y for DSM 'Ee Hsame‘ bo#y eJis's" SMG 10 WP D
Specifications:

GSM 1.33 (old GSM 10.20)
GSM 2.33
GSM 3.33
Currently maintained by SA3 LI as
41.033"1.33
42.033"2.33
43.033"3.33
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Abbreviations I
AAA
ADMF
BM-SC
CC
CS
ASN.1
CC
CSCF
DF
GGSN
GPRS
GSM
GSN
HI
HI1
HI2
HI3
IMEI
IMS

Authentication, Authorization, and Accounting
Administration Function
Broadcast-Multicast Service Centre
Content of Communication
Circuit Switched
Abstract Syntax Notation, Version 1
Content of Communication
Call Session Control Function
Delivery Function
Gateway GPRS Support Node
General Packet Radio Service
Global System for Mobile communications
GPRS Support Node (SGSN or GGSN)
Handover Interface
Handover Interface Port 1 (for Administrative Information)
Handover Interface Port 2 (for Intercept Related Information)
Handover Interface Port 3 (for Content of Communication)
International Mobile station Equipment Identity
IP Multimedia Core Network Subsystem

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Abbreviations II
IMSI
IP
IRI
LEA
LEMF
LI
MF
MME
MSISDN
P-CSCF
P-GW
PDP
S-CSCF
S-GW
SGSN
SIP
SMS
URI
URL
Company Confidential
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International Mobile Subscriber Identity
Internet Protocol
Intercept Related Information
Law Enforcement Agency
Law Enforcement Monitoring Facility
Lawful Interception
Mediation Function
Mobility Management Entity
Mobile Subscriber ISDN Number
Proxy Call Session Control Function
PDN Gateway
Packet Data Protocol
Serving Call Session Control Function
Serving Gateway
Serving GPRS Support Node
Session Initiation Protocol
Short Message Service
Universal Resource Identifier
Universal Resource Locator
Bernhard Spalt / Sep. 2008

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