KR0176098B1 - Method of transmitting facsimile data through cdma system - Google Patents

Abstract

Disclosed is a document facsimile transmission method in a CDMA mobile communication network that is compatible with a facsimile apparatus in a general switched telephone network.

According to the present invention, an individual mobile subscriber having a data terminal transmits document facsimile image data to an existing general switched telephone network subscriber or the same CDMA mobile network subscriber using a modem provided by a CDMA mobile communication network without a modem to be used by the data terminal. Can be. Therefore, according to the present invention, the same document facsimile transmission is possible to users familiar with existing services in a CDMA mobile communication network.

Description

Document facsimile transmission method in CDMA mobile communication network

1 is a block diagram illustrating a document facsimile transmission system in a CDMA mobile communication network of the present invention.

2 is a diagram for explaining a document facsimile transmission procedure in a public switched telephone network (PSTN).

3 is a diagram illustrating a document facsimile transmission procedure in the CDMA mobile communication network of the present invention.

The present invention relates to a document facsimile transmission method in a Code Division Mutiple Access (CDMA) mobile communication network, and more specifically, to a mobile subscriber having a data terminal provided by a CDMA mobile communication network without a modem for use by the data terminal. The present invention relates to a document facsimile transmission method capable of transmitting document facsimile image data to an existing general switched telephone network subscriber or the same CDMA mobile communication network subscriber using a modem.

In general, the sending of a document facsimile uses image scanning, fax image conversion, and fax software running on a facsimile device with a single modem function, or on a data terminal that interfaces with the facsimile modem, collectively referred to as the facsimile device. It becomes possible. However, in a CDMA mobile communication network, an actual fax modem that can be used by a mobile subscriber is placed in an Inter Working Function (IWF) in a base station's mobile switch, and a modem is assigned to the subscriber after a call is established between the mobile station and the base station. The transmission is performed.

Currently, the fax service in the CDMA mobile communication network is in the development stage, and in order to enable such a service, the compatibility with the existing fax-only device or the data terminal on which the software is operated must be prioritized. In addition, a physical connection with a CDMA mobile terminal should be possible as an interface for wireless. At this time, most facsimile equipments serviced in the existing general switched telephone network are recommended by the International Telegraph Advisory Committee (hereinafter referred to as CCITT). T.2., T.3. Or standardization of Group-3 facsimile devices (CCITT Recommendation T.4.), Procedures for transmitting document facsimile on a public switched telephone network (CCITT Recommendation T.30.), And signaling. Therefore, in the CDMA mobile communication network, CCITT T.4. And T.30. Are recommended.

An object of the present invention is to provide a document facsimile transmission method in a CDMA mobile communication network that enables the same document facsimile transmission to users familiar with reference services in a CDMA mobile communication network. According to an aspect of the present invention, a terminal adapter requests a mobile terminal to start a call with a modem dial command coming from a data terminal, and the terminal adapter processes and stores a modem command coming from the data terminal. A second step of allocating one modem after the call between the mobile station and the base station is established, a third step of transmitting a modem command stored from the data terminal to the assigned modem and receiving a result code from the modem; A fourth step of connecting the data terminal to the modem after recognizing a predetermined message informing the connection with the receiving side facsimile apparatus by the terminal adapter, and Recommendation of the International Telegraph and Telephone Advisory Committee (CCITT). And a fifth step of proceeding from the phase B process to the phase E process.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

1 is a block diagram showing a document facsimile transmission system in a CDMA mobile communication network according to the present invention.

Referring to FIG. 1, the document facsimile transmission system of the present invention comprises a data terminal 10, a terminal adapter (or modem emulator) 20, and a mobile terminal 30 to configure a mobile station 100 on a transmitting side. And a modem in the Inter Working Function (IWF) to configure the base station 200 on the transmitting and receiving side. The receiving side facsimile apparatus is comprised with the receiving side mobile station 300 which is the same CDMA mobile telephone network as a general switched telephone network or the mobile station of a sending side.

According to the above-described configuration, the mobile subscriber physically connects the data terminal 10, the terminal adapter 20, and the CDMA mobile terminal 30, and then, regardless of the existence of a wired / wireless or a modem only by using a modem command, is the same. Fax service is available.

The terminal adapter 20 takes over the role of the modem until the modem is assigned in order to enable the mobile subscriber to have a transparent service that is not involved in call setup and the presence of the modem, and provides all modem configuration information for the potential mobile subscriber. It processes and stores individual modem configuration information on behalf of the base station 200 which it may not have. Thus, when a call between the mobile terminal 30 and the base station 200 is established and one modem is allocated from the IWF in the base station 200, the mobile subscriber uses this modem to fax to the same CDMA mobile subscriber or subscriber of the public telephone network. Image data can be sent.

In order for a mobile subscriber to be assigned a modem for transmission of a document facsimile, the call connection between the mobile station 30 and the base station 200 according to a call processing procedure in a CDMA mobile communication network should be prioritized. Initiation of the call for facsimile transmission is made by the ATD command, which is a modem dial command. First, the terminal adapter 20 mimicking a modem requests a call to the mobile terminal 30 with a receiving telephone number and a fax service option for ATD commands coming from the data terminal 10. At this time, the mobile terminal 30 proceeds with the call processing procedure and service option with the base station 200 with the received telephone number and fax service option. This represents a process of replacing the dial function of a modem in a wired line with a call processing procedure in a CDMA mobile communication network. At the time when the call between the mobile station 100 and the base station 200 is connected, the mobile switch is connected to the IWF in the base station for the fax service option, and the IWF assigns one modem to the mobile station 100.

In order to connect with existing facsimile devices via a mobile communication network, it is desirable to follow the facsimile facsimile transmission protocol (see CCITT described above). Referring to Fig. 2, the procedure of document facsimile transmission and reception according to CCITT Recommendation T.30. In a public switched telephone network (hereinafter referred to as PSTN) is as follows. In FIG. 2, Data Terminal Equipment (DTE) and Data Circuit Equipment (DAC) at the sender and receiver use Group-3 facsimile modem commands. Modem commands that control fax modems vary among fax modem manufacturers, but their operation is described in CCITT Recommendation T.30. Follow the procedures and signals. This CCITT Recommendation T.30. The procedure is described as five separate consecutive phases as follows.

Phase A: Arc Settings

Phase B: Pre-Message Procedure for Identification and Selection of Required Equipment

Phase C: Send Message

Phase D: Post-Message Procedures and Multi-Document Procedures Including Ending and Confirmation of Messages

Phase E: Arc Recovery

Each of these pages represents the establishment and retrieval of connections in accordance with normal rules for use in a public switched telephone network (PSTN), identification, monitoring and control of facsimile transmissions according to protocols, and identification, monitoring and control of facsimile message transmissions. When the DTE initiates a call using the ATD command, the DEC dials the receiver, detects call progress, generates a CNG tone, and waits for a DIS frame.

As soon as the DCE detects the first phase B preamble (V.21 ch. 2 modulated by 300 bits / s HDLC flags), it sends a + FCON message to the DTE indicating the connection with the other party.

In phase B, the DCE negotiates both function identification and reception conditions, and generates a DCS frame with the received DIS frame and the + FDIS parameter previously set. Upon receiving the + FDT message from the DTE, DCE stops transmitting the DSC frame and proceeds to phase C. In phase C, actual data transfer and DLE ETX character transfer proceed. Phase C is terminated when a single page document is sent, and the DTE sends a multipage document or T.30. Post message indicates the start of phase D for the procedure. In phase D, if + FET is 0, it goes back to phase B to negotiate the next page document; if + FET is 2, the document transfer is complete for the whole page and proceeds to phase E step, with a 'hang up' code (+ FHNG ) Is released.

In the present invention, the transmitting side data terminal 10 for document facsimile transmission in the CDMA mobile communication network is defined as the transmitting side DTE, and the modem of the IWF is defined as the transmitting side DCE to operate according to the receiving side facsimile and each phase. It is.

In order to transmit a document facsimile in a CDMA mobile telephone network, the call access procedure between a mobile station and a base station and a document facsimile transmission procedure in a general switching network are combined, and the entire procedure is synchronized.

Hereinafter, the data terminal 10, the terminal adapter 20, the mobile terminal 30 and the base station 200, and the receiving side facsimile apparatus when transmitting a document facsimile using a data terminal in a CDMA mobile telephone network according to the present invention The signal and procedure method of the liver will be described with reference to FIG.

Referring to FIGS. 1 and 3, an 'origination message' sent from the mobile station 100 to the base station 200 is a message used when the mobile station 100 requests a call from the base station 200. 30 sends the received telephone number and the fax service option received from the terminal adapter 20 in this message. Also, the modem command group starting with AT + F is T.30. Indicates the modem command group according to the procedure.

In the document facsimile transmission method of the present invention, first, when the mobile subscriber interfaced with the data terminal 10 inputs a modem command regardless of the presence or absence of a modem in phase A, the terminal adapter 20 receives and processes and stores it. In addition, the mobile terminal 30 requests the initiation of a call for the fax service option by using the telephone number of the receiving fax machine together with the ATD command which is a modem dial command. Accordingly, when a call is established between the mobile station 100 and the base station 200 (Call Connection) and the IWF is woken up, the terminal adapter 20 is previously stored through the reverse call channel of the mobile station 100. One modem configuration parameter is sent to the modem, which processes the individual modem commands, returns the resulting code to the terminal adapter 20 and attempts to connect with the receiving fax. At this time, the terminal adapter 20 receives and ignores the result code that the data terminal 10 knows as previously processed, and waits for a + FCON message indicating that the modem is connected to the receiving side facsimile device. Once the call is established with the receiving facsimile device, the modem sends out a + FCON message indicating the call setup, and the terminal adapter 20 recognizes the + FCON message and subsequently receives all commands and data from both sides (data terminal and modem) to the other side. It only plays the role of handing over. After receiving the + FCON, the data terminal 10 performs the remaining procedures of CCITT Recommendation T.30. Described above together with the identification of both functions in phase B and the confirmation of the condition of reception.

As described above, according to the document facsimile transmission method in the CDMA mobile communication network according to the present invention, the conventional analog mobile communication network must be equipped with a cellular fax modem between the data terminal and the mobile terminal to provide a service with a general switched telephone network (PSTN). On the other hand, users who are familiar with existing services in CDMA mobile communication networks with different configurations and service approaches of fax modems can receive services without difficulty in configuring new networks.

Claims (1)

A document facsimile transmission method in a CDMA mobile communication network, comprising: a first step of a terminal adapter requesting a mobile terminal to start a call with a modem dial command coming from a data terminal; A second step of allocating one modem after the terminal adapter processes and stores the modem command from the data terminal and establishes a call between the mobile station and the base station; Transmitting a modem command stored from the data terminal to a terminal adapter to an assigned modem and accepting a result code from the modem; A fourth step of connecting the modem with the data terminal after the modem recognizes, by the terminal adapter, a predetermined message indicating the connection with the receiving side facsimile device; And Recommendations from the International Telegraph and Telephone Advisory Committee (CCITT) T.30. And a fifth step of performing a phase E process from the phase B of the procedure.