TSG-T Working Group 3 (USIM) meeting #3	TSGT3#3(99)-085
Helsinki 16th - 18th March 1999	
Agenda Item:	8
Source: 	ARIB SWG7
Title:	Study report from SWG7 ST1 (Sub Team-1)
Document for:	Information
Introduction
The ARIB SWG7 studied the scenario of plastic roaming between 3G and 2G systems in its Sub Team-1 (ST-1) chaired by NTT DoCoMo. The GSM and ANSI evolution systems are assumed for 3G, while PDC, GSM and IS-95 based systems are for 2G. The ST-1 started in December 1998 and finished its final study report in January 1999 (see the attached report).
The report concludes that so called multi-application (different applications are separated under different DFs) should be used for roaming between 3G and 2G systems, except for the following cases:
1)	Access to GSM network using GSM evolution UIM
2)	Access to GSM evolution network using GSM UIM (SIM)
3)	Access to IS-95 network using ANSI evolution UIM
4)	Access to ANSI evolution network using IS-95 UIM
In those cases above, a single UIM application might be used to access to a visited network based on a different system, as well as the home network, however a possibility to use the multi-application is also suggested for the case 1) and 2).
The report also pointed out possible cases and some UIM related issues for dual mode terminals.

Attachment: 
SWG7 ST1 Study Report on Plastic Roaming - Scenario of plastic roaming with 2G and dual-mode terminal - (January 19,1999)