3GPP TSG CN WG3
Sophia Antipolis, 13-15 April 1999	N3-99060

Agenda Item:	Technical Work: UMTS - facsimile

Source:	NTT DoCoMo

Title:	Enhancement of GSM 03.46 in UMTS/IMT-2000

Document for:	Discussion

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1  	Introduction

According to decision by 3GPP TSG SA WG1, real-time non-transparent FAX should be supported in UMTS/IMT-2000. Considering succession to service ability, we propose enhancement of GSM 03.46 to support real-time non-transparent FAX in UMTS/IMT-2000.

2  	
Problems in wireless FAX communication and solutions

In wireless FAX communication systems, the following problems occur: the transmission throughput decreases because of the re-transmission, and the timer time-out of the T.30 protocol interrupts the fax transmission before it is completed. Enhancement of GSM 03.46 in UMTS/IMT-2000 specification is a modified T.30 protocol for radio networks, that is intended to solve the re-transmission and delay problems (Fig.1).

3  	
Explanation for the solutions

3.1  	Case 1

Transmitted	CED , CSI , DIS*, TSI , DCS* , FTT , CIG* , DTC* , Pix end , EOP , MPS , EOM , DCN , RTC

* bits after No. 40 are deleted	
Not transmitted under the given conditions	The FAX adapter doesn’t transmit the TCF error detection signal when an incorrect TCF is received after an incorrect TSI and DCS signal set is received from the FAX.	
	The adapter does not retransmit signals that have already been correctly received. 	
Not transmitted under any  conditions (delete)	NSF , NSC, CFR , MCF , RTP , RTN , PIP , PIN	
Modify	PRI-EOP → EOP,  PRI-MPS → MPS ,  PRI-EOM → EOM	
Table 1	Classification of signals

3.2  	
Case 2

3.3  	
Case 3

4  	
Proposal

This document describes concrete enhancement points of GSM 03.46 to support real-time non-transparent FAX in UMTS/IMT-2000. We propose that GSM 03.46 should be modified as described in this document for UMTS/IMT-2000.

5  	References

[1] 	GSM 03.45	Technical Realisation of FAX group 3-transparent
[2] 	GSM 03.46	Technical Realisation of facsimile group 3 non-transparent
[3] 	ARIB STD-27G	PERSONAL DIGITALCELLULAR TELECOMMUNICATION SYSTEM RCR STANDARD (originally in Japanese).