SMG4/TSG-CN3/TSG-T2
Yokohama, 19-21 April 1999	TSGT2#3(99)365

Agenda Item:	

Source:	NTT DoCoMo

Title:	 “Scope.”

Document for:	Discussion

___________________________________________________________________________

This document is based on Chapter 4 in T2-99056, and serves as an umbrella to the other documents about external interfaces of mobile termination. 

<Change from T2-99056>
•	 Exchange ME and MT because it had pointed in the last meeting in London
•	Add the sentence “The interface and their functions specified in this report are optional, and manufactures or operators can adopt them for each kind of phones at will. Of course, phones that have no external interfaces are allowed.” 

Contents
1	Scope	3
2	Normative References	3
3	Abbreviations	3
4	Reference Configuration	3

1	Scope
This present document specifies the reference configuration of the external interface of mobile termination (MT) for the 3G Mobile System.
2	Normative References
[1]	3GPP T2-99056: “A Proposal for External Interface.”
[2]	GSM 07.07: “Digital cellular telecommunication system (Phase 2+); AT Command set for GSM Mobile Equipment.”
[3]	ARIB Chapter 8: “A Proposal for External Interface Specification.”  
3	Abbreviations
MS	Mobile Station
MT	Mobile Termination
USB	Universal Serial Bus
IrDA	Infrared Data Association
TE 	Terminal Equipment
TA 	Terminal Adapter
ME	Mobile Equipment

4	Reference Configuration
External interface assumes an abstract architecture comprising a TE (e.g. a computer) and an MT interfaced by a TA (see Figure 4.1). ME consists of TA and MT, and MS consists of ME and TE. The span of the control of the defined commands should allow handling any physical implementation that this abstract architecture may lead to:
‑	TA, MT and TE as three separate entities;
‑	TA integrated under the MT cover, and the TE implemented as a separate entity;
-	TA integrated under the TE cover, and the MT implemented as a separate entity;
-	TA and MT integrated under the TE cover as a single entity

Figure 4.1:	 Configuration
As the interface between TE and ME, some physical interfaces are proposed (see T2-99366), and AT commends is proposed in the T2-99xxx (TBD). As the interface between TA and MT, a sample of Terminal Adapter Interface is proposed (see T2-99367).
The 3G system will support diversified multi-media/multi-call services that include voice, data, and visual images.  Therefore, the external interfaces must support high-speed and multiplexed data transmission. The interface and their functions specified in this report are optional, and manufactures or operators can adopt them for each kind of phones at will. Of course, phones that have no external interfaces are allowed.