Telephonic communications – Having light wave or ultrasonic link for speech or paging... – Including fiber optic link within telephone network
Patent
1994-04-15
1996-07-16
Kuntz, Curtis
Telephonic communications
Having light wave or ultrasonic link for speech or paging...
Including fiber optic link within telephone network
379 60, 379100, 370 951, H04Q 722
Patent
active
055374581
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a facsimile service in a digital cellular radio network.
BACKGROUND OF THE INVENTION
In connection with the standardization of the European mobile phone system GSM plans have been made to include a facsimile service in the system with equipment configuration as shown in FIG. 1. The present facsimile terminals employ a modem interface and a 2-wire connection (modem connection), for example, via a telephone network. Thus, all signalling between fax terminals has taken place over a modem connection. In a digital cellular radio network at least one of the fax terminals would be disposed in connection with a mobile radio unit, whereby the fax connection must be established through a radio link between the mobile radio unit and the fixed network. In the GSM cellular radio system, this has been planned to be embodied in accordance with FIG. 1: a fax terminal 1 is connected in a normal manner over a 2-wire modem connection to a specific fax adaptor 2, by means of which the signals of the 2-wire connection are adapted to a specific data connection established over the radio link between the mobile radio unit MS and the base station system BSS to a mobile exchange MSC and further to a network terminating unit IWF comprising a second fax adaptor 5. The second fax adaptor 5 adapts the above-mentioned data connection to a conventional 2-wire modem connection, for example, through a public switched telephone network PSTN to another fax terminal. The implementation of a fax connection over a radio path involves, however, different kinds of problems, wherefore the standardization of the facsimile service according to FIG. 1 is still unaccomplished, and the facsimile service will not be available for the GSM users for some time.
SUMMARY OF THE INVENTION
An object of the present invention is to render facsimile transmission possible in the present digital cellular radio systems.
According to the invention, an arrangement for facsimile transmission in a digital cellular radio network, this arrangement comprising radio terminal equipment; data terminal equipment which is connected to the radio terminal equipment and is the source or destination of fax messages to be transmitted; a fax device with a line interface for a fax connection and a control interface, to which the data terminal equipment is operationally connected to control the fax device; a network terminating unit in a mobile exchange; and call control means for establishing a digital data transmission connection between the network terminating unit and the radio terminal equipment, is characterized in that the fax device is a fax modem disposed in the network terminating unit, and that the data terminal equipment is operationally connected to the control interface of the fax device through the radio terminal equipment and said digital data transmission connection.
The idea of the invention is to dispose a fax modem in a network terminating unit in association with a mobile exchange so that a data terminal in association with the radio unit controls the fax modem through a standard data connection established between the network terminating unit and the radio unit. In other words, the data terminal, e.g. a personal computer PC, controls the fax modem as if it were connected directly to the data terminal via a standard control interface except that in the invention the standard interface is "extended" over the data connection through the cellular radio network. The invention allows the fax modem to be a commercially available fax terminal and the data terminal to be e.g., a conventional personal computer PC provided with software for such transmission carried out through the fax modem. By means of the invention it is possible to avoid system-specific fax adaptors at both ends of the data connection, whereas in the configuration under standardization they are necessary. Thus, the invention renders it possible to implement a facsimile service very advantageously even with the existing commercial equipment and by th
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WO, A1, 9202100, 6 Feb. 1992, p. 3, line 13,--p. 4, line 25.
Suomi Arto
Terho Mikko
Cumming William
Kuntz Curtis
Nokia Telecommunications Oy
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