3GPP TSG-T WG2#4
Miami, US, 14-16 April 1999	TSGT2#4(99)514

Agenda Item:	

Source:	SWG5 Chair

Title:	SWG5 Meeting report

Document for:	TSG T2 Closing Plenary

___________________________________________________________________________

1	Introduction
This is the report on the third meeting of SWG5, held at the TSG T2#4-meeting in Miami. For this meeting 7 delegates showed up, almost only representing operators. To get a better picture of the technical aspects of the Multi-mode terminal it would be desirable to have more manufactures attending the meetings. Therefore SWG5 urge the manufacturers to attend the meetings and contribute to the work.

The list of participants can be found in section 4.

The list of input documents can be found in section 5 and the list of output documents in section 6.
2	Input documents
The following input documents were reviewed and discussed.
2.1	T2-99462 LS from RAN4 on Multi-mode terminals
No special specifications/reports relevant for the work on Multi-mode terminals were identified in RAN4. Even so it might be sufficient for this SWG to keep an eye on the TS25.1XX-series which is dealing with handover questions. The question whether just GSM/UMTS handover is considered or also handover between FDD and TDD was raised and the assumption for that is that by having a glance at the document this will be clear.

2.2	T2-99465 LS from RAN2 on terminal capabilities
This was a combined answer on LS sent from SWG5 and SWG6 on “LS on ongoing work in T2 SWG5 – Multimode terminals” respectively “Report of the current status on terminal capabilities”. The section relevant for this group (no. 2) was read through and discussed. Three documents were mentioned to be relevant for the work in this SWG and it was noted that these documents already exists in the table of reference documents found in T2-99370 (from the T2#3-meeting in Shin Yokohama). The three documents mentioned are:
•	25.303, UE Functions and Interlayer Procedures in Connected Mode
•	25.304, UE procedures in Idle Mode
•	25.331, RRC Protocol Specification
These documents are not stabilised yet and therefore the newest versions always have to be used in the work with the report. The newest versions can be found on the 3gpp webb-site.

2.3	T2-99468 LS from T3 on Implications of GSM-UTRAN handover and GSM access on the USIM
This LS caused a discussion on what alternative that should be the best to perform the GSM access from a USIM card for GSM-UTRAN handover. Several aspects were mentioned, e.g. the implication of when the subscriptions belong to the same or different operators, how to handle and get in contact with the information for authentication when just accessing a GSM-system, security issues, etc. The discussion also included the implications of a wider perspective when not just GSM and UMTS will be the options for handover. An ad hoc group was formed to create a draft LS back to T3 that then could be discussed and agreed within the group. In the LS several pros and cons are stated as comments to T3 from a Multi-mode terminal point of view.

The resulting answer back to T3 can be found in T2-99512.

2.4	T2-99511 TR ‘Multi-mode issues’
Source: Telia AB
The updated version of the technical report on Multi-mode issues was presented by the rapporteur. The areas that were updated were the definitions of the terminals and the part of the scenarios when the multi-mode user is having subscriptions for both a 2nd generation and a UMTS system operated by the same operator. Except for some editorial comments, this caused a discussion mainly dealing with the subjects listed below.

•	The definition of the type I terminal. As it was defined in the report, with two terminals of different systems incorporated into one shell and with manually switching between the modes, it did not seem to be a terminal that is a good choice for any user. Instead it was decided that this type of terminal would be able to automatically switch between the modes. The implication of the type I terminal was discussed for several situations, mostly for idle mode where pagings may be missed when scanning for other modes if the scanning is not done in a smart way.
•	Signalling matters: to make the type I terminal usage convenient it was stated in the report that it should be possible to page the terminal through the registered/active mode when there is an incoming call/connection in the other mode. This signalling could also be used for traffic management, e.g. when the operator finds that it would be more efficient to have the camping or active subscriber in another system. This will cause changes in the GSM-system and it was agreed that if it is possible, this should be the desired alternative.

This discussion resulted in a LS (T2-99513) to SA2, SA, CN1 and CN about a request that the network shall be aware of in which system the multi-mode user is active/registered for the moment.

•	The general comment on the section with the scenarios was that it was very confusing as not only the way to go between a 2nd and a 3rd generation systems was described but also the implications that packet switched (PS) and circuit switched (CS) connections/calls and the type of terminals are doing to the terminals behaviour in the different scenario-situations (start up, incoming connection, outgoing connection and for mobility management). The rapporteur agreed with this and some major clarifications will be made to this section.

A new and updated version of the report, including the comments from this meeting, will be sent to the SWG5 e-mail reflector in the end of June.

2.5	T2-99453 T2 work program
The work program was reviewed and it was recognised that the time scale was incorrect. For correct information on the time scale, MCC was directed to T2-99392, which is the updating of the WI made last T2-meeting. There are no changes to the WI so far.

2.6	T2-99524 3G Security; Integration Guidelines
The specification was briefly reviewed and it was concluded that the useful information in this specification is to have knowledge about the overall architecture for the security and to know where the different parameters for the security process are placed.
3	Future work
It was decided that an SWG5 ac hoc meeting for about 2 days should take place in Malmö, Sweden in the last week of July. This meeting will totally be assigned to do some further work on the report. Confirmation on this and further practical details concerning this meeting will be sent to the SWG5 e-mail reflector and all interested delegates are welcome to attend the meeting.

The meeting after the ad hoc meeting will take place at the T2#5-meeting in Finland 6th - 9th of September.

In between the meetings, work will be progressed using the SWG5 e-mail reflector on the 3GPP-server.

4	Participants list
There were 7 participants from 7 companies in the group, the Siemens- and Nokia-representative only present the second day.

Name	Company	Email	
Sofi Persson (chairman)	Telia AB	sofi.a.persson@telia.se	
Annette Grönqvist	Sonera Ltd	annette.gronqvist@sonera.fi	
Duncan Fitt	BTCellnet	duncan.fitt@btcellnet.co.uk	
Ramin Afchar	Mannesmann	ramin.afchar@d2privat.de	
Kazuhiro Arimitsu	NEC	arimitsu@mcd.yh.nec.co.jp 	
Jörg Swetina	SIEMENS	joerg.swetina@siemens.at 	
Alan Chau	Nokia UK	alan.chau@nmp.nokia.com	

5	Input documents
Doc number	Title	Comments	
T2-99453	TSG-T2 work program		
T2-99462	LS from RAN4 on Multi-mode Terminals		
T2-99465	LS from RAN2 on terminal capabilities		
T2-99468	LS from T3 on Implications of GSM-UTRAN handover and GSM access on the USIM		
T2-99510	Draft SWG5 Agenda		
T2-99511	TR "Multi-mode issues"		
T2-99512	Reply on LS from T3 on GSM access from the USIM in conjunction with GSM-UMTS handover	To T3	
T2-99513	LS on the Network recognition of the registered mode of a Multi-mode terminal	To SA2, SA, CN1, CN	
T2-99514	SWG5 Meeting report		
T2-99534	3G Security; Integration Guidelines		

6	Output documents
Doc number	Title	Comments	
T2-99512	Reply on LS from T3 on GSM access from the USIM in conjunction with GSM-UMTS handover	To T3	
T2-99513	LS on the Network recognition of the registered mode of a Multi-mode terminal	To SA2, SA, CN1, CN	
T2-99514	SWG5 Meeting report