KR20020052774A - Method for interfacing analog G3 FAX in a WLL terminal based narrowband CDMA - Google Patents

Abstract

PURPOSE: An analog G3 fax interface method in a WLL(Wireless Local Loop) terminal based on an N-CDMA(Narrowband-Code Division Multiple Access) is provided to support both of an interface method based on an IS-99 mode of PC fax and an interface method in compliance with an IS-707A.7 mode, in one WLL terminal. CONSTITUTION: If a fax call is generated, driving power is applied to a fax processing unit(S101). The receiving of a DTR(Data Transfer Rate) signal is waited(S102). Whether the DTR signal is received is checked(S103). If received, whether an analog G3 fax interface mode is an IS-99 mode is checked(S104). If so, a string of "IS 99" is transmitted to the fax processing unit(S106). The fax processing unit processes fax data in the IS-99 mode(S107). If the fax interface mode is not an IS-99 mode in the S104 step, whether the fax interface mode is an IS-707A.7 mode is decided(S105). If not, error processing is performed and the steps are ended(S110). If the fax interface mode is an IS-707A.7 mode, a string of "IS707A7" is transmitted to the fax processing unit(S108). And the fax processing unit processes fax data in the IS-707A.7 mode(S109).

Description

Method for interfacing analog G3 FAX in a WLL terminal based narrowband CDMA

The present invention relates to an analog G3 fax interface in a narrowband code division multiple access (N-CDMA) based wireless subscriber network (WLL) terminal, and in particular, a method for interfacing based on IS-99 PC fax in one WLL terminal. And analog G3 fax interface method in N-CDMA-based WLL terminal which can support both interface method conforming to IS-707A.7.

In general, the WLL has been developed as a concept for economically supporting a service supported by a wireline telephone using a wireless network. Services supported by the existing wired network include voice call service, fax transmission service, PC communication access service using a modem, Internet access service, and PC fax service.

Among them, WLL has a service based on PC-Fax based on IS-99, and a fax service based on IS-707A.7.

First, the IS-99 based PC fax method can be interworked with the existing wireless data network that supports the PC fax function, but the functions such as fax transmission and reception during voice calls are not supported.

Next, the IS-707A.7 scheme has been recently proposed to guarantee end-to-end fax transmission and reception, but there is a disadvantage that the system and the terminal must be upgraded to support this. .

Currently, both of them are used interchangeably in an N-CDMA WLL network.

Therefore, the WLL terminal should support the service in one of two ways, IS-99 and IS-707A.7, depending on whether the system supports it. There is a disadvantage that can not be used in 99 network.

Therefore, the present invention has been proposed to solve the problems that occur when the analog G3 fax support in the conventional N-CDMA-based WLL terminal as described above,

An object of the present invention is to provide an analog G3 in an N-CDMA based WLL terminal capable of supporting both an interface method based on IS-99 PC fax and an interface method according to the IS-707A.7 standard in one WLL terminal. To provide a fax interface method.

Analog-to-Fax interface method in narrowband CD-based wireless subscriber network terminal according to the present invention for achieving the above object,

It supports the IS-99 function to enable existing IS-99 fax service to the IS-707A.7 terminal, and enables the terminal to select and operate one of these two interface methods.

In addition, the setting of the terminal adds a setting item to the "FEATURE CODE" so that the user can select according to the interworking system.

In addition, the terminal stores the mode set by the user in a nonvolatile memory and transmits a mode selection string to the facsimile processing unit when a fax call is attempted to be controlled.

According to the present invention according to the technical idea as described above, "Analog G3 fax interface method in narrowband CD-based wireless subscriber network terminal",

An analog G3 fax interface method in an N-CDMA based WLL terminal,

Supplying power to a fax board when a fax call occurs and checking whether a DTR signal is detected;

Determining the analog G3 fax interface mode when the DTR signal is detected;

When the analog G3 interface mode is an IS-99 method, transferring a character string “IS99” to a facsimile processing unit so as to control the interface using the IS-99 method;

When the analog G3 interface mode is the IS-707A.7 mode, and transmits the string "IS707A.7" to the fax processing unit characterized in that it comprises the step of controlling the interface to be made in the IS-707A.7 method.

1 is a block diagram of a WLL terminal to which an analog G3 fax interface method is applied in an N-CDMA based WLL terminal according to the present invention;

2 is a flowchart illustrating an analog G3 fax interface method in an N-CDMA based WLL terminal according to the present invention.

<Explanation of symbols for the main parts of the drawings>

500 ..... Mobile station modem (MSM)

600 ..... SLIC

700 ..... DTMF Receiver

800 ..... Fax Processing

820 ..... Data Terminal Equipment (DTE)

830 ..... Fax Modem

Hereinafter, a preferred embodiment of the present invention according to the technical spirit as described above will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a WLL terminal to which an analog G3 fax interface method is applied in an N-CDMA based WLL terminal according to the present invention and a peripheral device thereof.

Here, reference numeral 100 denotes a general telephone, reference numeral 200 denotes a standalone analog G3 fax, and reference numeral 300 denotes a telephone line portion connected to the standard telephone 100 and the fax 200 line.

Here, the general telephone 100, the fax 200, the telephone line unit 300, and the like are peripheral devices connected to the WLL terminal.

Next, reference numeral 400 denotes an RF module connected to an antenna ANT to wirelessly interface data with a base station, and reference numeral 500 is connected to the RF module 400 to transmit a voice call, data transmission and reception, and a fax interface. To transmit the data indicating the interface mode to the fax processing unit to be described later so that the fax data can be interfaced according to the analog G3 fax interface method, and the mobile station modem (MSM) for controlling the overall operation of the WLL terminal. Indicates.

Reference numeral 510 denotes a multiplexer for selecting data of the UART port or the external UART port 520 in the fax processor according to the selection signal transmitted from the mobile station modem 500, and reference numeral 530 denotes the multiplexer. A connection switch for controlling the connection between the UART port and the external UART port 520.

In addition, reference numeral 600 is connected to the telephone line unit 300 and the mobile station modem 500, detects a hook state and transfers it to the mobile station modem 500, the data between the fax modem and the telephone line unit 300 A slick unit provides a connection path, and reference numeral 700 denotes a DTMF receiver that receives and transmits a DTMF tone output from the slick unit 600 to the mobile station modem 500.

Also, reference numeral 800 denotes a fax processing unit that processes fax data, and includes a UART port 810 for interfacing data with the mobile station modem 500, a data terminal device 820, a fax modem 830, and an SRAM. (SRAM) 840, flash memory 850, and the like.

The operation of the WLL terminal to which the present invention configured as described above is briefly described is as follows.

When not using a normal fax, the multiplexer 510 selects data of the external UART port 520 by the selection signal of the mobile station modem 500.

Next, when a fax call is generated, the mobile station modem 500 supplies driving power to the fax processing unit 800 and gives a multiplexer 510 a selection signal so that the fax data is selected.

In this state, the fax processing unit 800 receives data transmitted from the mobile station modem 500 through the UART port 810, which is a serial port of the fax processing unit 800, and interfaces with the data terminal device 820. The result is then output via the fax modem 830. The fax signal thus output is converted into a tip-ring signal in the slick unit 600 and then transmitted to the fax 200 through the fax line in the telephone line unit 300.

In the case of a general voice call, the voice signal is transmitted to the general telephone 100 by controlling the slick unit 600 directly from the mobile station modem 500 without passing through the fax processing unit 800. In this case, the fax processing unit 800 Becomes a signal detection state for detecting a fax signal between slicks.

In addition, the facsimile processing unit 800 is not used while the terminal does not make a call, so power is cut off by the control of the mobile station modem 500 to reduce power consumption.

In addition, when the fax call is started in the terminal, the mobile station modem 500 supplies power to the fax processing unit 800 and interfaces the data to the fax processing unit 800 in the IS-99 manner, or in the IS-707A.7 method. Determines whether to interface data and informs.

Here, the method of informing the fax data interface method to the fax processing unit 800 by the mobile station modem 500 includes a method using an I / O pin in hardware. However, since the mobile station modem 500 separately allocates an input / output port, It is not suitable for small terminals requiring consumption.

Therefore, in the present invention, the hardware interface used in the IS-99 method is used as it is, and by using the method of transmitting the mode selection string by the mobile station modem 500 to the fax processor 800 by software, it is compatible with the existing hardware interface. Make this possible.

2 is a flowchart illustrating an analog G3 fax interface method in an N-CDMA based WLL terminal according to the present invention.

As shown in the drawing, when a fax call occurs, supplying power to the fax processing unit and checking whether a DTR signal is detected (S101 to S103); Determining the analog G3 fax interface mode when the DTR signal is detected (S104 to S105); When the analog G3 interface mode is an IS-99 method, transferring a character string “IS99” to a facsimile processing unit so as to control an interface using the IS-99 method (S106 to S107); When the analog G3 interface mode is the IS-707A.7 mode, transmitting the character string "IS707A.7" to the FAX processor to control the interface to be made in the IS-707A.7 method (S108 to S109); If it is not the branch mode, an error process is performed (S110).

In the N-CDMA-based WLL terminal according to the present invention, the analog G3 fax interface method first checks whether the mobile station modem 500 generates a fax call in step S101. Apply drive power.

In step S102, a predetermined time (100 msec) is waited until a DTR signal is generated. In step S103, it is checked whether the DTR signal is received. Here, the DTR signal supplies power to the fax modem and indicates that the mobile station modem 500 is ready after being activated by the fax modem.

Upon receiving the DTR signal as a result of the check, it is checked in step S104 whether the analog G3 fax interface mode is the "IS-99" system.

If the fax interface mode is the "IS-99" method as a result of the check, in step S106, the character string "IS99" is transmitted to the fax processing unit 800 to inform that the fax data interface mode is the "IS-99" method. Accordingly, in step S107, the fax processing unit 800 processes the fax data in the "IS-99" method.

If the fax interface mode is not the "IS-99" method as a result of the confirmation, it is checked in step S105 whether the fax interface mode is the "IS-707A.7" system.

If the result of the check is that the fax interface mode is not the " IS-707A.7 " system, the error processing is terminated in step S110.

In contrast, when the fax interface mode is "IS-707A.7", the character string "IS707A7" is transmitted to the fax processing unit 800 in step S108, and the fax data interface mode is "IS-707A.7". In this case, the fax processing unit 800 processes the fax data in the "IS-707A.7" method.

According to the present invention "analog G3 fax interface method in the N-CDMA-based WLL terminal" described above, there is an advantage that the WLL terminal that supports the fax for IS-707A.7 can also support the existing IS-99 method.

In addition, the modem of the mobile station uses a mode selection string to inform the facsimile processing unit how to use the fax service. This can be done through software processing without hardware conversion in an interface supporting the existing IS-99 method, thus eliminating unnecessary waste of input / output ports. It can be prevented, there is an advantage that also meets the requirements of the terminal requiring a compact configuration.

Claims (1)

An analog G3 fax interface method in an N-CDMA based WLL terminal, Supplying power to a fax board when a fax call occurs and checking whether a DTR signal is detected; Determining the analog G3 fax interface mode when the DTR signal is detected; When the analog G3 interface mode is an IS-99 method, transferring a character string “IS99” to a facsimile processing unit so as to control the interface using the IS-99 method; When the analog G3 interface mode is the IS-707A.7 mode, the transfer of the string "IS707A.7" to the fax processor to control the interface to be made in the IS-707A.7 method, characterized in that the N -Analog G3 fax interface method on CDMA-based WLL terminals.