Facsimile and static presentation processing – Facsimile – Multiplex
Patent
1996-11-05
1998-09-08
Vu, Kim Yen
Facsimile and static presentation processing
Facsimile
Multiplex
358435, 370536, 455450, 455509, H04N 1333
Patent
active
058053018
DESCRIPTION:
BRIEF SUMMARY
This application is the national phase of international application PCT/FI96/00136, filed Mar. 6, 1996 which designated the U.S.
FIELD OF THE INVENTION
The invention relates to facsimile transmission in mobile communication systems.
BACKGROUND OF THE INVENTION
ITU-T Recommendation T.30 defines procedures for document facsimile transmission in the public switched telephone network. The facsimile terminals according to this recommendation are called Group 3 Facsimile terminals. A characteristic of the Group 3 facsimile terminals is that they are able to negotiate, in the beginning of a call, the facsimile data rate that is most suitable for the connection quality. The facsimile data rate can be renegotiated during the call if the connection quality changes. The data rates generally used for the Facsimile Group 3 are presently 2.4, 4.8, 7.2, 9.6, 12.0 and 14.4 Kbps. The new Facsimile Group 3 data rates that will be supported by data modems in the near future include 16.6, 19.2, 21.6, 24.0, 26.4 Kbps, etc. in steps of 2.4 Kbps up to 38.4 Kbps, or higher.
The present telefax terminals have been designed for fixed telephone networks and they employ a modem interface and a two-wire connection (modem connection) via a telephone network. Thus all signalling between telefax terminals has taken place over a modem connection. It has not been necessary for the telephone network to monitor for example the facsimile data rate negotiated by the telefax terminals or to respond to the data rate by modifying the characteristics of the modem connection.
In a digital cellular radio network, the telefax terminal is located at a mobile station, whereupon the facsimile connection must be established through a radio link between the mobile station and the fixed radio network. For example in the Recommendation 03.45, version 4.4.0, of the Pan-European mobile system GSM (Global System for Mobile Communications), the technical implementation of the service supporting the terminal equipments of Facsimile Group 3 is determined by using transparent telecommunication services of the GSM system. One full-rate GSM traffic channel can support the facsimile data rates of 2.4, 4.8, 7.2 and 9.6 Kbps. The equipment configuration according to the recommendation is illustrated in FIG. 1. A telefax terminal 1 is connected with a normal two-wire modem connection to a facsimile adapter 2 which adapts the signals of the modem connection to a rate-adapted V.110 data connection. The V.110 connection is established via a radio interface between a mobile station MS 3 and a base station system BSS 6 to a mobile services switching centre MSC and further to an interworking function (IWF) 8 located at the MSC. The interworking function 8 contains another facsimile adapter 8A which adapts the aforementioned data link to a conventional two-wire modem connection which is established for example via the public telephone network (PSTN) 9 to another telefax terminal 10. As an alternative to the configuration of FIG. 1, the telefax terminal 1 and the facsimile adapter 2 may be integrated into a GSM telefax terminal which provides an analog output. From the point of view of the mobile station MS, the GSM telefax terminal is as the facsimile adapter 2.
The idea of the GSM Recommendation 03.45 is to allow the T.30 protocol to pass transparently, whenever possible, through the adapters 2 and 8 at the ends of the GSM data link. The T.30 protocol is only manipulated when it is necessary to avoid problems resulting from the differences between the PSTN and GSM systems. For example in a GSM facsimile call, the user data rate which is determined by the GSM network during the call set-up (on the basis of information received from the mobile station or from the subscriber data) is the allowed maximum data rate during the call. However, the telefax terminals may negotiate the actual facsimile data rate during the call according to the ITU-T Recommendation T.30. This actual data rate may vary between 2.4 Kbps and the allowed maximum data rate. The facsimile adapter 8A of
REFERENCES:
patent: 4805167 (1989-02-01), Leslie et al.
patent: 5050004 (1991-09-01), Morton, Jr.
patent: 5278827 (1994-01-01), Pound
patent: 5335225 (1994-08-01), Brax
patent: 5583851 (1996-12-01), Kato et al.
CCITT Blue Book: V 110, "Data Communication over the Telephone Network", Sep. 1992.
CCITT Blue Book: V 24, "Data Communication over the Telephone Network", Mar. 1993.
Patent Abstract of Japan, vol. 16, No. 530, E-1287,Shigeru Mikami, 16 Jul. 1992.
Nokia Telecommunications Oy
Vu Kim Yen
Williams Kimberly A.
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