Tdoc N3-99149
Joint 3GPP TSG-CN-WG3 / ETSI SMG3 WPD
Abiko, Japan						
14th-18th June 1999

Title: 	Proposed Work Item description for the support of PIAFS in UMTS

Source: 	NTT DoCoMo, NEC

Purpose:	For decision

 Reflecting to the liaison statement (N3-99083: Liaison Statement regarding CS bearer services) from S1, the N3 has reviewed the overview of PIAFS in the CN3 #4 meeting in Abiko and concluded that PIAFS service is feasible to the UMTS. The following is a part of copy of the N3-99083.

------ Copy ------
                        
S1 current understanding is that interworking as specified at 02.02 contains needed scenarios for release '99. Both Asynchronous and Synchronous access modes shall be supported (when suitable) for:  
-	3.1kHz Audio modems up to V.90 (0.3kbit/s-56kbit/s)
-	V.110 UDI (0.3kbit/s-56kbit/s)
-	X.31 flag stuffing UDI (2.4 kbit/s-56kbit/s)
-	V.120 (1.2kbit/s-56kbit/s)
-	Bit Transparent Mode (56kbit/s and 64kbit/s). 

S1 asks N3 to study feasibility to include PIAFS interworking support for release '99. 

------ End of copy ------

x		Support of PIAFS in UMTS

x.1		TSG Project

	UMTS Radio Access	
	GSM Radio Access	
X	GSM-UMTS Core Network	
X	UMTS Services	

x.2		Linked Work Items

Work Item Description for Circuit Switched Bearers in UMTS

x.3		Justification

 Currently, The PIAFS service is well known as the data communication system serviced by the PHS in Japan. This service needs to be continuously serviced by the UMTS system because of the following reasons.

•	Connection between PHS-MS and UMTS-UE is required. 
•	Connection between UMTS-UE and existing TA (Terminal Adapter) for PIAFS is required. (TA for PIAFS is also popular in Japan.)

x.4		Service Aspects

The PIAFS service is a CS type of data protocol specified by ARIB and has been serviced by the PHS system in Japan. 
Currently, the number of PHS users reaches 5780000 and approximately 10[%] of PHS users use PIAFS.

Acronyms:
•	ARIB: 	Association of Radio Industries and Businesses
•	PHS:		Personal Handy phone System. (PHS is similar to DECT system.)

•	PIAFS: 	PHS Internet Access Forum Standard

		
x.4.1		Configuration

x.4.2		Features of L2

•	Selective repeat type of retransmission
•	Flow control
•	Data compression(V.42bis)
•	Initial negotiation of parameters such as Round Trip Delay
•	29.2[kbps] mode and 58.4[kbps] mode will be provided.

x.4.3		Connection model

x.4.4		Assumed treatment for PIAFS in UMTS-CN

•	U-Plane
NT service is applied. Configuration of IWF is similar to other NT type of IWF. See following figure. L1 for UDI performs rate adaptation based on V.110.

•	C-Plane
Some identifier that can identify IWF for PIAFS is needed.

x.5		MMI Aspects

None

x.6		Charging Aspects

None

x.7		Security Aspects

None

x.8		Impacts

Affects:	USIM	ME	NW	Others	
Yes		X	X		
No	X				
Don't know					

x.9		Expected Output and Time scales 

Approval of WI			TSG-CN               (September 99)

Start of Report			TSG-CN-WG3     (September 99)

Scope and first draft		TSG-CN-WG3     (September 99)

Approval of deliverable by TSG	TSG-CN               (December 99)

x.10		 Work Item rapporteurs

NEC

x.11		Supporting Companies

NTT DoCoMo, Fujitsu, Lucent, NEC

x.12		Responsible STC(s)

Primary Responsibility		TSG-CN WG3

Secondary Responsibility 	TSG-CN WG1

x.13		Others