3GPP TSG SA WG2                                                                                           S2-990142
						
15th-19th March 1999

Title: 		Proposed Work Item for : The improvement for the support of IP communication using PPP for MS（ADP） access

Source: 	NTT DoCoMo

Purpose:	For Discussion 

Abstract

x.0		Working Item title
The improvement for the support of IP communication using PPP for MS（ADP） access

x.1		TSG Project

	Terminal 	
	Radio	
X	Core Network	
	System	

x.2		Linked Work Items
Not specially.

x.3		Justification

When IMT-2000/UMTS users make IP communication  with PPP socket, there are two methods supported according to the current GPRS specification. The first method is to terminate PPP at GGSN as one PDP type. The second method is to terminate PPP at ADP (PDP type is IP). The first method may have trouble e.g. in roaming and Best effort services cases from PPP timer (request-acknowledge for 3second) point of view. But the first method itself will not be denied. This work item rather try to improve the second method for the IP communication. 

x.4		Service Aspects

If operators agree with roaming agreement with each other, concern about the communication in case of e.g. best effort and roaming from delay point of view,  they can select PPP termination at UE (PDP type is IP) under the condition of implementation effort for decreasing delay for control plane in each network.

x.5		MMI Aspects
Not relevant.

x.6		Charging Aspects
Not relevant

x.7		Security Aspects
Not relevant

x.8		Impacts

Affects:	Terminal	Radio	CN	Others	
Yes			x		
No	X	x		x	
Don't know					

x.9		Expected Output and Time scales 

Approval of WI:			TSG SA WG2 # 4    (March  99)

Start of Report			TSG SA WG2 # 5   (April 99)

Scope and first draft		TSG SA WG2 # 6   (May 99)

Approval of deliverable by TSG	TSG SA WG2 # 6   (May 99)

x.10		 Work Item rapporteurs
NTT DoCoMo
x.11		Supporting Companies

x.12		Responsible STC(s)

Primary Responsibility	SA TSG WG2

Secondary Responsibility 	CN TSG WG1

x.13		Others
This work item intend to seek the solution for PPP termination at UE with the study of the feasibility from the impact on the GPRS specification point of view. It should be noted that the study of the  feasibility from actual delay value point of view is implementation (of equipment and operation) matter and UP to operators.

The principle for the solution is as follows.
(1)	The impact on the current GPRS specification and the coming GPRS network shall be minimized.
(2)  The new messages to be added to PDP activation will exchanged between MS and GGSN.The parameters in the messages will be transferred by SGSN transparently. This way of solution will cause the minimal impact on the SGSN.