3GPP TSG SA WG3 #4
London, UK, 16-18 June 1999	TSGS3#4(99)144	

3GPP  T3#5	Tdoc T3-99158
31 May - 2 June, 1999
Aaland Islands, Finland

Liaison statement

To:	3GPP TSGs S1, S2, T2

From:	3GPP TSG-T3

Title:	Implications of GSM-UTRAN handover and GSM access on the USIM

For:	Comment

TSG-T3 has studied the requirements on 
•	intra-PLMN handover between UTRAN and GSM BSS (according to UMTS 22.00)
•	access to pure GSM networks 
with dual-mode terminals.
In this context the potential implications on the USIM were questioned; in particular, it was unclear which identities, parameters and algorithms are to be used to access the GSM BSS or GSM network.
The following alternatives were identified:
1.	The handover/access is achieved with a pure USIM (i.e. the necessary identities,  parameters and algorithms available in the USIM are sufficient for GSM access);
2.	additional GSM identities and algorithms (e.g the GSM IMSI) are to be embedded in the USIM;
3.	a complete GSM application is present in the card  (which would mean a dual-mode card).
TSG-T3 seeks guidance on which of the above alternatives applies. Since the resolution of this issue is crucial for the progress of TSG-T3, a timely response would be appreciated.