3GPP TSG SA WG3 (Security) meeting #7	Tdoc S3-99360
Den Haag, 26 - 27 October 1999

Source:	Mannesmann Mobilfunk, T-Mobil, T-Nova
Title:	Enhanced User Identity Confidentiality
	(related CRs for 33.102, 33.103)
Agenda Item:	11.2
Purpose:	For approval

The CRs in S3-99361 (on 33.102) and S3-99362 (on 33.103) address the two open issues which have been discussed at S3#6:
1.	Paging with permanent identity
The proposed solution has small impact on the existing protocols. The proposed mechanism combines the paging message with an authentication (of the HE). Because authentication after paging with IMUI is required anyway there should be no additional signaling load. Furthermore only 2% of all paging messages use the IMUI.
2.	Routing of EMUI to the appropriate HE network element.
The HE operator is responsible that the USIM delivers suitable information that the SN is able to route the message to a HE network element. The HE operator has to take care that the network element can handle the message appropriately.