3GPP TSG-S3 #8, SMG10-99#3
Sophia Antipolis, 16 - 19 November, 1999	Tdoc S3-99404	
Tdoc SMG10 99D089 
Final Report of the SMG10-WPD meeting #7/99 on lawful interception
London September 21, 22 and 23 1999

Please direct all comments to 
Bernie McKibben at p17982@email.mot.com. by October 22,1999
Chairman: Bernie McKibben 		Motorola Satellite Communications Division
Support/Secretary: to be determined		ETSI  PT-SMG

List of participants:	see annex A
List of documents:	see annex B
Outputs 	see annex C

1	Opening and approval of proposed agenda
The meeting was welcomed by Charles Brookson on behalf of the host DTI. The domestic arrangements were given. 
The proposed agenda with working schedule in Tdoc SMG10 99D073 was proposed by the chairman. The working schedule was accepted and the documents were allocated. The main issues for this meeting were: 
1.	Prepare for joint meeting with TC Sec
•	Update TC sec alignment document based upon latest TC Sec spec
•	Review GPRS TC Sec activity
2.	Complete first draft of the 3GPP architectural specification with all major sections included.
3.	Review latest comments from SA3 on 3GPP requirements specification. 
4.	Review NA6 progress of interception of IN, discuss possibility of joint meeting 
5.	Complete draft of CAMEL stage two specification CR.
6.	Begin location services
The report from the latest SMG10-WPD meeting in Helsinki during July 1999 is available in Tdoc SMG10 99D063. 
SMG10-WPD specifications: 	rapporteur

GSM 01.33: Lawful Interception requirements for GSM version 7.0.0	David Miles (Cellnet)
GSM 02.33: Lawful Interception - stage 1 version 7.2.0	Bernie McKibben (Motorola)
GSM 03.33: Lawful Interception - stage 2 version 7.0.0	Bernhard Spalt (Siemens)

3G LI specifications:

3G TS 33.106 Lawful Interception Requirements version 1.0.0 	Berthold Wilhelm (Reg TP)
3G TS 33.107 Lawful Interception Architecture and Functions version 0.0.1 	Berthold Wilhelm (Reg TP)

1	CR to 3G LI Requirements Specification, Tdoc 99D068
Tdoc 99D058 was submitted by Berthold Wilhelm for review. The following updates were agreed:

1.	Section 2: Handover interface referred to as ES 201 671, no longer DES/SEC-003003  
2.	Section 3: Location Dependent Intercept added to list of definitions. 
3.	Section 5.2.1: MSISDN,IMSI and IMEI are identified as list of target identities. Editors note states completion of list is for further study.
4.	Section 5.2.1.3 Large editors note on encrypted stored data is deleted. Charles Brookson to propose this section for ETR 331.
5.	Section 5.2.2.1. The bullet, ‘ A circuit switched data call is requested either originated from or terminated to the target,’ is deleted.
6.	Section 5.4: ‘Visited or roaming,’ changed to ‘home or visited.’

These changes were added to the change request at the meeting. Tdoc 99D068 will be the modified CR. The CR will be forwarded to SA3 for approval at the SA3 plenary in November.
Conclusion:
The revised CR as agreed upon in London will be forwarded to SA3 for approval at the SA3 plenary in November.   

2	Proposed revisions to 3G LI Architecture and Functions Tdoc 99D066 (source: Berthold Wilhelm, Reg TP)
Proposed Version 0.0.3 was reviewed through section 6.4.1.2. The following is an overview of the agreed changes through section 6.4.1.2:
1.	The use of terms referring to 3G switching nodes needs to be researched and revised. The document need to be consistent with existing 3G specifications. The chair agreed to look up the existing 3G specifications and make a recommendation to the group.
2.	Section 4 will be consolidated and revised such that the interception functional blocks are described in an a sequential fashion.
3.	References to X_0 will be changed to HI throughout the document.
4.	References to intercepted product will be changed to content of communications throughout the document.
5.	LEMF will be used instead of LEA when the context is to equipment and not an institution.
6.	Section 5.3 The section will be reworded as follows. Interrogation provides the current status of the interception activation in the system.
7.	Section 6 References to ‘one stubline’ will be changed to ‘mono delivery’. References to ‘two stubline’ will be changed to ‘stereo delivery’.
8.	Section 6.3.2 A table will be used instead of a list to convey the list of events.
9.	Section 6.3.2 and 6.3.3: The following information fields are added:
•	Other Target Location Information
•	Redirecting number
•	Redirection number
•	Redirection information
Note: It is the chairs recommendation that the selection of these fields be discussed and confirmed with the balance of the existing fields such as dialled number, connected number, other party address, and call direction fields.
10.	Section 6.3.4.3 SCI is defined to be ‘Subscriber initiated changes in service activation and deactivation. 
11.	Sections 6.4.1.1 and 6.4.1.2. The sections will be reworded to be more explicit as to the nature of traffic and correlation portrayed in figures 19 and 20.
12.	The balance of the proposed document was not reviewed and will need to be completed at the next WPD/3G LI meeting.
Conclusions:
(1)	The chair will make recommendations on the use of 3G network element terms at the next WPD meeting.
(2)	Sections up through 6.4.1.2 will be revised as agreed upon in London. The remainder of the document will need to be reviewed at the next WPD/3G LI meeting.

3	Alignment with TC Sec circuit switched HI. Tdocs 99D064 and 99D081 
Tdoc 99D064 was presented as the results of a WPD meeting held on August 18 to review the latest ES201 671 v1.1.1 and make a comparison to GSM 02.33 and GSM 03.33. The report was revised into a list of recommendations and questions to be used at a joint meeting with TC Sec in October 21 in Sophia. The following changes were agreed:
•	2.1.9: GSM TS 0x.33 does not support alarms and notifications.
•	2.1.10: p.17:We'd recommend to add item no. 9 on accounting and charging;
•	2.1.11: Chapter 6.5: Shall all of these identifiers be sent from the mediation function or from IIF as stated in figure 2? Which network elements produce which identifier? This can be network specific. Therefore figure 2 can only serve as an example.
•	2.1.12: p.31: 7th. paragraph: Does this require mapping to ISUP in any case?
•	2.1.13: chapter 8:3rd. paragraph: 'period' of time needs to be defined, buffering means and means to delete the buffer need  to be standardized.
•	2.1.14: Chapter A8: SMG10-WPD recommends not to use ASN.1 BER and ROSE for the GPRS payload. SMG10-WPD will come up with a counter proposal in a separate liaison.
•	Chapter 4.2: 2.2.4.2.1: SMG10-WPD believes that the 3rd bullet is not applicable and shall be deleted.
•	2.2.4.3.2: page 17; 3rd. paragraph: Maximum number of LEAs that can intercept one and the same subscriber at the same time is missing. SMG10-WPD recommends the maximum number to be five.
•	2.2.6.1.1: How is the realization of the different identifier for different LEAs? Administrative problem to assign the Lawful Interception Identity uniquely. If the operator administers the LII, how to identify the correlation between LII and MSISDN at the LEA? SMG10-WPD believes it would be advantageous to have the country code, LEA code and network code in the LII.
•	2.2.8.1.2: SMG10-WPD recommends to delete the very detailed part of this chapter starting with the 5th. Paragraph: “ Some examples for layers 1 to 3:…” up to ”... ROSE, ASN.1 and BER provide a robust communications path between the two parts of the LI application.” 
•	2.2.8.1.3: SMG10-WPD recommends to limit ROSE the circuit switched traffic only. Therefore we propose to change the first sentence to “ The protocol used by the LI application for the encoding and the sending of circuit switched data between the MF and the LEMF is based on ROSE components”.
•	2.2.13.3.1: Please expand the explanation as to which of the different authentication mechanisms should be employed to address various risks..
•	2.2.1.13.2: SMG10-WPD recommends that CLIP, CLIR and CUG usage is an option. There are other access verification mechanisms that could replace CLIP, CLIR and CUG.
•	Comment on section A.4 removed.
•	Chapter B.10: 2.2.B.10.1: Please clarify which calls and which actions are intercepted.
•	Chapter B.16.1.1: 2.2.B.16.1.1.1: GSM 0x.33 optionally keeps the CC in case of CF as well. SMG10-WPD recommends to introduce this option..
•	Open issues were closed and removed from the report.
Conclusion:
The revisions were completed at the meeting and will form Tdoc 99D081 to be used at a joint meeting with TC Sec.

4	GPRS Handover Tdocs 99D072, 99D075, 99D076, 99D090 (sources: TC Sec, Siemens and Nokia)
Tdoc 99D072 was submitted to WPD for review and comment from TC Sec, but it was unclear from TC Sec if WPD had received the correct version of the GPRS handover interface draft material. Therefore, Tdoc 99D072 was tabled pending further advise from TC Sec. Robin Gape, who was at the London meeting said that he would issue a list of talking points or issues in place of Tdoc 99D072. This list will be prepared by the WPD meeting in October.
Tdocs 99D075 and 99D076 were reviewed in cursory fashion. Even so, the following recommendations to TC Sec on the GPRS handover interface as currently defined in ES 201 671 were agreed upon:  
1.	Para 5.4 Add Location Dependent Interception with a reference to GSM 02.33 and GSM 03.33.
2.	New paragraph 6.5 Add a new paragraph to address packet switched correlation. Use of charging Ids, unique GSN indicators and other possible correlation parameters for packet switching correlation is for further study. Paragraph 6.4 should be entitled Circuit Switched Correlation
3.	Para 5.3.3 Packet Switched Data Service
4.	New paragraph 8.4.5 A new paragraph on GPRS events should  be added.
5.	Table 4.0 needs to be expanded for GPRS
6.	Table 5.0 needs to be expanded for GPRS
7.	Para 9.2 Call out GPRS protocol and correlation. Add a GPRS specific figure.
8.	Para 13.3 Add GPRS statement.
9.	Para 13.3.3 Add a new paragraph that states IP Sec should be considered for packet oriented secured delivery 
10.	Annex 5 Adapt for GPRS parameters 
11.	Annex 8 We recommend using a variant of GPT headers for H13 transfer. ASN.1 should be avoided for delivery of GPRS CC. Definition of variant is for further study.
12.	We recommend that a joint WPD/TC Sec working party be established to complete the GPRS handover interface. The joint working party should begin in October.

Conclusion:
These recommendations on the GPRS interface will be documented in Tdoc 99D090. WPD chair will contact Robin Gape on forming a joint working party to complete a GPRS handover interface specification.

Update from the WPD Chair: I have spoken with Robin Gape, chair of TC Sec LI and we have agreed to form a joint working subgroup with TC Sec and WPD members to complete the GPRS handover interface. The output of the group will be passed to the larger TC Sec group for formal approval into ES 201 671. The first joint meeting is planned for October 19 and 20 in Sophia. The goal will be to complete GPRS handover interface  specifications by the end of the year.

5	CAMEL and SPAN6 IN Tdocs 99D069, 99D070 and 99D071
NA6 presented three documents to WPD for review on lawful interception of IN services. It should be noted that NA6 has included interception points within the IN service nodes. WPD has determined that it cannot resume its work on CAMEL until December given its current mandated completion date of 3G specifications and the work needed on GPRS. As such, WPD will not be able to provide complete comments to SPAN 6 until December of this year.
Conclusion:
WPD will not be able to provide complete comments to SPAN 6 until December of this year. Even so, SPAN 6 has requested a joint meeting with WPD in October. The meeting is schedule from 3-5PM on October 21. The purpose of the meeting will be to solicit preliminary comments from WPD as well as compare the direction, schedule and approaches of both groups.

6	Interworking of Location Services and LI will be postponed until December 

7	Joint meetings in October
A joint meeting with TC Sec on GPRS HI will be held on October 19. The purpose of the meeting will be to kick off a joint working group on GPRS HI. WPD will present Tdoc 99D090.
A joint meeting with TC Sec on GSM HI will be held on October 21 am. The purpose of the meeting will be to align to the maximum extend agreeable ES 201 158 and GSM 02.33/03.33 . WPD will present Tdoc 99D081.
A joint meeting with SPAN 6 on IN LI will be held on October 21 pm. The purpose of the meeting will be to compare the direction, schedule and approaches of both groups.

8	Open items for GSM/GPRS stage 1 and stage 2 materials 
8.1	Stage 1 open items
•	Optimal routing (material completed, to be submitted to SMG for approval)
•	Shared Interworking Functions
•	CAMEL (material completed, to be submitted to SMG for approval)
•	Location Services
8.2	Stage 2 open items
•	CAMEL  
•	Location Services

8.3	Stage 3 open items
•	None

8.4  	3G LI Requirements
•	Final review and updates for release
8.5	3G LI Architecture
•	Packet switched and security sections need to be completed
8.6	Output documents to SMG10 e-mail list 
The following documents need to be distributed to SMG10. 
London report
TC Sec liaison statement on GPRS initial comments

8.7	Output documents to 3GPP via Berthold Wilhelm
The following documents are to be submitted to 3GPP for review
CR to 3GPP Lawful Interception Requirements, V1.2.0

9	Any other business
9.1	SMG10_WPD e-mail list
There is an e-mail list for SMG10-WPD which is called: smg10_wpd. If a list member wants to send a message to all the SMG10-WPD members the message just has to be mailed to: smg10_wpd@list.etsi.fr. 
New members have to attach themselves to the SMG10-WPD list by sending the following message
subscribe smg10_wpd     <persons own name>         to            listserv@list.etsi.fr.
The list manager (to be assigned) will receive the indication of a new member and can give permission for registration to the SMG10_WPD list, since the SMG10_WPD list is a restricted list. The list manager can remove persons from the SMG10_WPD e-mail list.
10	Review of draft report
The draft report was available October 15, 1999. The draft report was e-mailed to the participants and was/will also be put on the ETSI server in the SMG10-WPD area. The report could be commented and modified until the October 22, 1999 to Bernie McKibben at p17982@email.mot.com. The meeting report will be submitted to SMG10 plenary November, 1999. 
11	Future meeting dates and closing of the meeting
The following dates for SMG10-WPD meetings are scheduled:
October 19,20 and 21 1999	SMG10-WPD; ETSI, Sophia

November 23 and 24 1999		SMG10-WPD; ETSI, Sophia

December 1,2, and 3 1999		SMG10-WPD; Vienna, Siemens

February 15, 16 and 17		SMG10-WPD host required

April 11, 12 and 13		SMG10-WPD host required

July 18, 19 and 20		SMG10-WPD host required

The following tentative agenda for the next SMG10-WPD meeting was agreed:
1	Joint meeting with TC Sec on GPRS HI
2	3G LI Architecture
3	Joint meeting with TC Sec on GSM HI
4	Joint meeting with SPAN 6

The chairman thanked the delegates for their active participation. DTI was thanked for hosting the meeting.

Annex A

List of participants of the SMG10-WPD meeting #4/99 on lawful interception
Helsinki
Name	Company	CC	Telephone/Fax

Bernie McKibben 	Motorola Satellite Comm. Div	(US)	Tel:	+1 480 732 4749
     e-mail: p17982@email.mot.com		Fax:	+1 480 732 6350
 Wolfgang Hoge	Ericsson Eurolab	(DE)	Tel:	+49 2407 575288
     e-mail: eedwoh@eed.ericsson.se		Fax:	+49 2407 575477
Robin Gape (Chair of TC Sec LI)   BT	(GB)	Tel:	+44 1473 645907
     e-mail: robin.gape@bt.com			Fax:	+44 1473 644087
Bernhard Spalt	Siemens	(AT)	Tel:	+43 1 1707 21474
   e-mail: bernhard.spalt@siemens.at		Fax:	+43 1 1707 51922
Tom Johnston	ICO	(GB)	Tel:	+44 181 600 1075
   e-mail: tom.johnston@ico.com		Fax:	+44 181 741 0773
 Rolf Schnitzler (vice chair MoU-SG)  Mannesmann Mobilfunk	(DE)	Tel:	+49 211 533 2169
     e-mail: rolf.schnitzler@d2privat.de		Fax:	+49 211 533 2144
 Markus Martin	Nokia	(FN)	Tel:	+35 89 5116 9703
  e-mail: markus.martin@nokia.com		Fax:	+35 89 5112 9253
Martin Kassens	T-Mobil	(DE)	Tel: 	+49 22893 63306
   e-mail: martin.kaessens@t-mobil.de		Fax: 	+49 22893 63369
Kai Sjoblom	Nokia	(FN)	Tel: 	+35 850 1626
   e-mail: kai.sjoblom@nokia.com		Fax: 	+35 89 51163074
Tony Youel	UKMO	(GB)	Tel:	+44 17123 30737
   e-mail: tyeurls@gtnet.gov.uk
Berthold Wilhelm	Reg TP	(DE)	Tel: 	+49 68193 30561
   e-mail: berthold.wilhelm @regtp.de		Fax: 	+49 68193 30733
Charles Brookson	DTI	(GB)	Tel: 	+44 171 215 3691
   e-mail: cbrookson@iee.org			Fax: 	+44 171 931 7194

E-mail list for SMG10-WPD: smg10_wpd@list.etsi.fr

Annex B

List of documents of the SMG10-WPD meeting #6/99 on lawful interception
London September 1999

Annex C

Agreed outputs of the SMG10-WPD meeting September 1999
on lawful interception
London
1	Comments to TC Sec on GSM HI 
2	Comments to TC Sec on GPRS HI
3	Helsinki report
4	CR to 3G LI Requirements V1.3.0
5	3G LI Architecture V 0.0.4 through section 6.4.1.2
6	3G LI plan and status report to SA3