TSG-SA Working Group 1 (Services) meeting #3	TSGS1#3(99)363
	(rev 299)
Hampton Court, Surrey, UK 10th-12th May 1999	Agenda: 5.4.2

Work Item Description
Title
UMTS Interworking with ANSI-41 networks
Intended Output
Technical report that is a feasibility study.
Impact on Other Technical Specifications and Technical Reports
Based on output of this feasibility study a work item may be created.
Technical Scope
In certain regions ANSI-41 Networks provide wide area coverage.  and interworking  with ANSI-41 networks is necessary in order to facilitate the introduction  of UMTS via the use of multi-mode terminals. 
The requirements for the roaming, the hand-over, and interoperability  will be described in this document on service requirements with the following priorities:
•	Global Roaming (mandatory) 
•	Hand-over (optional)
•	VHE Interoperability (optional)
•	And so on(For Further Study)
The study should include set of telecommunication services to be supported and relevant security issues. The study should include evaluation of NNI concept currently being elaborated by ITU.
Impact on Other 3GPP Work Items
This report  provides the guidelines for other TSGs and WGs for the definition of Architecture and Networks.
Schedule of Tasks to be Performed.
Task	Planned Start	Planned Finish	
Work Item Creation	15/2/99	23/2/99	
Revised Work item Approval by TSG SA	26/4/99	27/4/99	
rafting and discussion	1/4/99	1/12/99	
Submission to TSG SA for approval	1/12/99	30/12/99	
Note:	* These dates are an estimate at present
Supporting Individual Members
LGIC, Lucent, Samsung, Nokia, Ericsson
Rapporteur
Mr Yeong Chong Han, LGIC Electronics, Korea