KR100787572B1 - System and method for telephone communication service utilizing usb modem - Google Patents

Abstract

A voice call system using a USB modem and a method thereof are provided to implement a voice call service only with a voice input/output unit and a call processing application by utilizing a USB modem having a mobile communication module. A voice call system consists of a USB modem(100) and a portable terminal(200). The USB modem(100) comprises a mobile communication module(110), a modem chip(120), a USIM card(121), a power module(130), and a USB connector(140). The mobile communication module(110) transmits and receives PCM data through a mobile network. The modem chip(120) sets up a voice speech path through the mobile communication module(110), and executes voice call service control. The USIM card(121) stores a subscriber ID for access to the mobile network. The power module(130) supplies power to the modem chip(120). The USB connector(140), connected to the USB port(210) of the portable terminal(200), transmits PCM data to the portable terminal(200) through the USB port(210). The portable terminal(200) comprises the USB port(210), a call processing application(220), a key input part(230), and a voice input/output part(240). The USB port(210) is provided to connect the USB modem(100). The call processing application(220) executes voice speech path setup according to user input, and performs modulation and demodulation for PCM data and analog voice signals. The key input part(230) conveys a user input signal for a call connection request to the call processing application(220). The voice input/output part(240) inputs and outputs analog voice signals.

Description

System and Method for Telephone Communication Service Utilizing USB Modem

1 is a network diagram illustrating a conventional USB modem utilization scheme;

2 is a network diagram for explaining a USB modem utilization method of the present invention,

3 is a block diagram of a voice call system according to an embodiment of the present invention;

4 is a flowchart sequentially illustrating a voice call method according to the embodiment of FIG. 3;

5 is a configuration diagram of a voice call system according to another embodiment of the present invention;

6 is a flowchart sequentially illustrating a voice call method according to the embodiment of FIG. 5.

<Description of Symbols for Main Parts of Drawings>

100, 100 ': USB modem

110, 110 ': mobile communication module

120, 120 ': Modem chip

121, 121 ': USIM card

130, 130 ': power supply module

140, 140 ': USB Connect

150 ': Audio codec

200, 200 ': mobile terminal

210, 210 ': USB port

220, 220 ': call processing application

230, 230 ': key input

240, 240 ': voice input / output unit

The present invention relates to a voice call system and method using a USB modem, and more particularly, a USB modem having a mobile communication module is connected to a portable terminal such as a notebook, and the voice input / output means and call processing application of the portable terminal are used. The present invention relates to a voice call system and method using a USB modem that enables a voice call through a mobile communication network.

Currently, Broadband Wireless Access (BWA), which allows users to access mobile communication networks through digital devices (laptops, desktop computers, PDAs, PMPs, digital cameras, etc.), is expected to be implemented.

The broadband wireless Internet access service utilizes the communication function of the USB modem. When the USB modem 10 having the mobile communication module is mounted on the portable terminal 20 such as a notebook or a PDA as shown in FIG. A WCDMA network or base station (BTS) 20 includes a Node B (31), a Radio Network Controller (RNC) 32, a Serving GPS Service Node (SGSN) 33 via a USB modem 10; 34, a base station controller (BSC) 35 and a packet data service node (PDSN, 36) that includes a principle to enable access to the Internet 40 through a network.

When this service is provided, users of digital devices (portable terminals) can receive wireless Internet service through the mobile communication network by simply installing a USB type modem that allows them to access the HSDPA / WIBRO / EVDO network. It is expected to be available in the whole life soon.

However, the USB modem for providing the broadband wireless Internet access service as described above was developed to satisfy the needs of digital device users for mobile Internet and to be provided with high-speed internet service while on the move. Nevertheless, it provides only data service and is not utilized for voice call service.

Accordingly, when the use rate of broadband wireless Internet access service increases in the future, it will be more likely to carry a USB modem for wireless internet use and a mobile phone for voice call, so that the mobile communication module is duplicated or purchased. In addition to causing customer complaints, it is expected to cause resource waste.

In addition, the USB modem for using the wireless Internet will be able to be installed and used in most digital devices rather than a specific portable terminal, so if most digital device users have a USB modem due to the desire for the portable Internet, Rather than attempting to purchase expensive mobile phones, the desire to provide voice call service using the existing USB modem will be increased, and in terms of national resource utilization, the minimum user interface for voice call using the already available USB modem It is expected that it is necessary to provide voice call service only by application.

Accordingly, the present invention is to solve the above-mentioned disadvantages and problems of the prior art, a voice call system and method using a USB modem to utilize the USB modem proposed for providing a wireless Internet service for voice call service. It is an object of the present invention to provide.

Another object of the present invention is to provide a voice call service using only a minimum voice input / output means and a call processing application by utilizing a USB modem having a mobile communication module.

In addition, an object of the present invention is to prevent user complaints about duplicate possession and purchase of a mobile communication module for use of a wireless Internet service and a voice call service, and to prevent resource waste.

The object of the present invention is a mobile communication module for PCM data transmission and reception through a mobile communication network, a modem chip for performing voice call service setting and voice call service control through the mobile communication module, and stores a subscriber identification number for mobile communication network access. A USB modem including a USIM card, a power module for supplying power to the modem chip, and a USB connector for transmitting the PCM data to the mobile terminal through a USB port; A USB port for mounting the USB modem, a call processing application for performing setup by voice call through the USB modem according to a user input, and performing demodulation and demodulation of PCM data and analog voice signals, and a user input signal for a call connection request. A portable terminal including a key input unit for transmitting to the call processing application and a voice input / output unit for analog voice signal input / output; It is achieved by a voice call system utilizing a USB modem.

In addition, the object of the present invention is a mobile communication module for transmitting and receiving PCM data through a mobile communication network, a modem chip for performing voice call service setting and voice call service control through the mobile communication module, subscriber identification number for mobile communication network access USIM card for storing the power supply, a power module for supplying power to the modem chip, an audio codec for performing demodulation of the PCM data and analog voice signals, and an external portable terminal USB port for analog voice signals through a USB port. A USB modem including a USB connector for transmitting to a mobile terminal; USB port for mounting the USB modem, a call processing application for setting up a voice call through the USB modem according to a user input, a key input unit for transmitting a user input signal for a call connection request to the call processing application, and an analog voice. A mobile terminal including a voice input / output unit for signal input / output; It is achieved by a voice call system utilizing a USB modem.

In addition, the above object of the present invention is provided with a mobile communication module and is equipped with a USB port of the portable terminal, a USB modem connected through a portable terminal and a PCM line, and a voice call method between the portable terminal equipped with the USB modem. A first step in which the portable terminal executes a call processing application when the USB modem is mounted; A second step of transmitting a call connection request signal including the called number to the USB modem through the USB port when the user requests the mobile terminal to input a called number and to connect a call; Transmitting, by the USB modem, a call connection request signal including the called number and the subscriber identification number of the USIM card included in the USB modem to the exchange of the mobile communication network through a mobile communication module; When the voice call path between the USB modem, the switch and the called terminal is set, PCM data is transmitted and received between the portable terminal and the USB modem, and the mobile terminal performs voice demodulation between the PCM data and the analog voice signal to make a voice call. The fourth step; It is achieved by a voice call method utilizing a USB modem comprising a.

In addition, the object of the present invention is a voice communication method between a USB modem having a mobile communication module and mounted as a USB port of a portable terminal and connected through a portable terminal and an audio signal line, and a portable terminal equipped with the USB modem, A first step of executing, by the portable terminal, a call processing application when the USB modem is mounted; A second step of transmitting a call connection request signal including the called number to the USB modem through the USB port when the user requests the mobile terminal to input a called number and to connect a call; Transmitting, by the USB modem, a call connection request signal including the called number and the subscriber identification number of the USIM card included in the USB modem to the exchange of the mobile communication network through a mobile communication module; When the voice call path between the USB modem, the switch and the called terminal is set, the USB modem performs an analog demodulation between the PCM data and the analog voice signal transmitted and received through the mobile communication network, and performs the analog voice signal transmission and reception with the mobile terminal. A fourth step of allowing the mobile terminal to perform an analog voice signal input / output through a speaker and a microphone to make a voice call; It is achieved by a voice call method utilizing a USB modem comprising a.

Details of the above object and technical configuration of the present invention and the resulting effects thereof will be more clearly understood from the following detailed description based on the accompanying drawings.

First, Figure 2 is a network diagram for explaining the USB modem utilization method of the present invention.

As shown, the present invention is equipped with a USB modem 100 in the mobile terminal 200 to receive a voice call service through the mobile communication network (MSC, 330, 360), the present invention is portable The terminal 200 may be any terminal having a USB port. That is, the portable terminal 200 of the present invention may be a laptop, PDA, PMP, digital camera, desktop computer, etc. In some cases, to use the mobile communication module of the USB modem 100 instead of its own mobile communication module. It could be a cell phone.

The USB modem 100 may be a dual band dual mode communication modem capable of connecting to a mobile communication network of different communication methods, as shown in the figure. In the drawing, the USB modem 100 connects to a WCDMA network and a CDMA network. Although it is illustrated, this is only an embodiment showing a HSDPA service and a USB modem implemented to receive the EVDO service as an embodiment, but is not limited thereto.

In the network as shown in FIG. 2, the portable terminal 200 of the present invention includes a Node B (Node B, 310), a radio network controller (RNC, 320) and an exchange (MSC, 330) through a USB modem 100. Voice call service is provided through the switch 330 of a WCDMA network, or a call is connected to a switch (MSC, 360) of a CDMA network through a base station (BTS, 340) and a base station controller (BSC, 350). Can be provided.

To this end, an audio path must be formed between the USB modem 100 and the portable terminal 200 of the present invention. In general, the analog voice signal is PCM (Pulse Code Modulation) coded and modulated PCM data or analog voice signal to the USB port The line should be connected to transmit and receive through the PC, and the audio codec for demodulation and demodulation between the PCM data and the analog voice signal should be provided in the USB modem 100 or the portable terminal 200.

The voice call system and the operation process of the present invention proposed in consideration of the essential implementation matters as described above are illustrated by embodiment in FIGS. 3, 4 and 5, 6.

First, Figure 3 is a block diagram of a voice call system according to an embodiment of the present invention, Figure 4 shows a voice call method according to the embodiment of FIG.

As shown in FIG. 3, the voice call system according to the present invention includes a USB modem 100 and a portable terminal 200.

The USB modem 100 includes a mobile communication module 110 including an EVDO module, an HSDPA module, a modem chip 120, a power module 130, and a USB connector 140.

The mobile communication module 110 is a communication module for transmitting / receiving PCM data during a voice call with an exchange through a mobile communication network. The mobile communication module 110 differs in terms of coverage or data transmission / reception rate as shown in the figure, and accesses a mobile communication network of different communication methods. In order to enable this, the dual mode dual band service may be provided by including two communication modules.

In this case, since the mobile communication module 110 transmits and receives wireless signals of different networks through one antenna, the mobile communication module 110 should include a diplexer for separating the corresponding transmitted and received signals.

In addition, each mobile communication module 110 is a duplexer for separating the TX signal and the RX signal, RX chipset for processing the frequency band of the RF signal received through the duplexer, frequency band of the transmitted RF signal transmitted from the modem chip 120 TX chipset for processing, power amplifier module that amplifies the power of TX chipset output signal and delivers it to duplexer.

Next, the modem chip 120 is a processor for performing voice call setting and voice call service control through the mobile communication module 110, and includes a DSP and a CPU, and provides a voice path to a board for providing a voice call service. Should be implemented.

In addition, the modem chip 120 transmits the identification number of the USIM card 121, which stores the mobile subscriber ID number, when the signal is transmitted to the mobile communication network so that the service is provided to the normal mobile subscriber.

Meanwhile, although the modem chip is illustrated as one block in the drawing, in the dual mode dual band mode, two modem chips may be provided as dedicated modem chips for each mobile communication module. Audio path interworking between two modem chips is required.

The power supply module 130 is a block for supplying power to the modem chip 120. In the dual mode dual band mode, there is a possibility that a voltage drop problem may occur due to capacity in a simultaneous service situation. It is preferable that the power supply is composed of two power supply modules. If a large voltage supply is possible and a voltage drop is not a concern, only one power supply module may be used.

The USB connector 140 is mounted as an external portable terminal 200 USB port 210 to transmit PCM data to the portable terminal 200 through the USB port 210. Since the present embodiment is an embodiment in which an audio data line between the USB connector 140 and the portable terminal 200 is connected to the PCM line, the PCM data is transmitted and received with the portable terminal 200, which will be described later with reference to FIGS. 5 and 6. In the embodiment of the present invention, the analog voice signal is directly transmitted.

Next, the portable terminal 200 equipped with the USB modem 100 includes a USB port 210, a call processing application 220, a key input unit 230, and a voice input / output unit 240 for mounting the USB modem 100. And the like.

The call processing application 220 is an application for performing a call request while the user is equipped with the USB modem 100 in the mobile terminal 200 and supporting call processing accordingly. The call processing application 220 is downloaded or mounted through the wired or wireless Internet. It may be provided in the form, the configuration of the call connection unit 221 and the PCM data and the analog voice signal to perform the setup by the voice call via the USB modem 100 according to the user input via the key input unit 230 The audio codec unit 222 performs modulation and demodulation.

The audio codec unit 222 demodulates the PCM data received through the USB port 210, converts the PCM data into an analog voice signal, and outputs the analog voice signal to the voice input / output unit 240, and the analog voice signal input from the voice input / output unit 240. By modulating the PCM data is transmitted to the USB modem 100 through the USB port 210.

That is, at the transmitting side, the analog voice signal is converted into PCM data, which is a digital signal through sampling, quantization, and encoding. When the converted PCM data is received by the portable terminal 200 through a transmission path, the portable terminal 200 is transmitted. The audio codec unit 222 reconstructs the PCM data again by reproducing and decoding the analog voice signal, and then outputs it to the audio input / output unit 240.

On the contrary, when a user inputs an analog voice signal to the audio input / output unit 240, the audio codec unit 222 converts the analog voice signal into PCM data by sampling, quantizing, and encoding the analog voice signal, and then through the USB modem 100. It is transmitted to the mobile communication network.

On the other hand, the call connection unit 221 is connected to the key input unit 230 for transmitting a user input signal for the call connection request to the call processing application 220, the audio codec unit 222 for the analog voice signal input and output It is connected to the voice input / output unit 240.

The voice call process by the system of FIG. 3 will now be described with reference to FIG. 4.

As shown in FIG. 4, when the USB modem 100 having the mobile communication module 110 is mounted on the USB port 210 of the portable terminal 200 and connected through the PCM line (S401), the portable terminal ( 200 executes the call processing application 220 automatically or manually (S402).

When the user requests a call by inputting an incoming number through the call processing application 220 (S403), the mobile terminal 200 transmits a call connection request signal including the called number to the USB modem 100 (S404). In addition, the USB modem 100 reads the subscriber identification number stored in the USIM card 121 and transmits it to the switch with the called number through the mobile communication module 110 to request a call connection with a specific called terminal (S405).

Accordingly, the exchange obtains the routing information of the called terminal through the home location register based on the called number, and requests (paging) the incoming call to the called terminal through the exchange to which the called terminal belongs based on the corresponding routing information (S406). According to the response of the terminal, a call connection is established between the USB modem 100 and the switch and the called terminal (S407).

Accordingly, the voice signal transmitted from the called terminal to the USB modem 100, that is, PCM data is transmitted to the mobile terminal 200 through the USB port, the mobile terminal 200 demodulates the PCM data through the speaker (or earphone) Output as an analog voice signal, and when the user inputs an analog voice signal through the microphone and modulates it into PCM data and transmits it to the USB modem 100, the communication path between the USB modem 100 and the destination terminal, USB modem (100) ) And the voice call is made through the audio path between the mobile terminal 200 (S408 and S409).

3 and 4 illustrate that the portable terminal has an audio codec and transmits and receives PCM data between the USB modem and the portable terminal. An analog voice signal may be directly transmitted and received, and the embodiment is illustrated in FIGS. 5 and 6.

As shown in FIG. 5, the voice call system of the present invention includes a USB modem 100 ′ and a portable terminal 200 ′. In the present embodiment, the USB modem 100 ′ and the portable terminal 200 ′ are provided. Since the audio codec 150 'is connected, the audio codec 150' should be provided in the USB modem 100 '.

That is, the USB modem 100 'of the present embodiment further includes an audio codec 150', and indicates that signals sent out and received through the USB connector 140 'are analog voice signals, not PCM data. Except that shown in Figure 3 has the same configuration.

Once again, the USB modem 100 'is a mobile communication module 110' including an EVDO module, an HSDPA module, etc., a modem chip 120 ', a power module 130', and an audio codec 150 '. And a USB connector 140 '.

The mobile communication module 110 ′ is a communication module for performing PCM data transmission and reception during a voice call with an exchange through a mobile communication network. In this embodiment, the parts for transmitting and receiving PCM data through the mobile communication network are the same.

In addition, the mobile communication module 110 ′ may also be configured with two mobile communication modules for dual mode dual band service, and each mobile communication module 110 ′ is a duplexer and duplexer for separating TX and RX signals. RX chipset for frequency band processing of RF signal received through TX chipset for frequency band processing of transmitted RF signal transmitted from modem chip 120 ', power amplifier that amplifies and transmits power of TX chipset output signal to duplexer Module, etc.

Next, the modem chip 120 'is a processor for performing a voice call setting and voice call service control through the mobile communication module 110', and a USIM card storing a mobile subscriber identification number when transmitting a signal to a mobile communication network. The identification number of 121 'is transmitted together, and in the dual mode dual band method, two may be provided as dedicated modem chips for each mobile communication module.

The power supply module 130 ′ is a block for supplying power to the modem chip 120 ′. In the dual mode dual band method, the power supply module 130 ′ is preferably composed of two power supply modules for supplying power to each modem chip.

The USB connector 140 ′ is mounted as an external portable terminal 200 ′ and a USB port 210 ′ to transmit an analog voice signal to the portable terminal 200 ′ through the USB port 210 ′. The analog voice signal received from ') is transmitted to the audio codec 150'.

The audio codec 150 'receives the PCM data received from the mobile communication network through the modem chip 120' and demodulates it into an analog voice signal and then forms an audio signal line between the USB connector 140 'and the USB port 210'. The analog voice signal received from the mobile terminal 200 'is modulated into PCM data and then transmitted to the modem chip 120' so that the corresponding PCM data is transferred to the mobile communication network. To be transmitted to the other terminal.

In other words, when the analog voice signal is converted to PCM data, which is a digital signal through sampling, quantization, and encoding, the audio codec 150 'is converted to an analog voice signal by reconstructing the PCM data by reproducing and decoding the data. After that, it is provided to the mobile terminal 200 '. On the contrary, when the analog voice signal of the user is input from the mobile terminal 200 ', the audio codec 150' samples, quantizes and encodes the analog voice signal, converts the analog voice signal into PCM data, and transmits the analog voice signal to the mobile communication network.

Meanwhile, the audio codec 150 'may be downloaded and mounted through the mobile communication module 110', and may be installed under the control of an external computer through a USB connection.

Next, the portable terminal 200 'on which the USB modem 100' is mounted includes a USB port 210 'for mounting the USB modem 100', a call processing application 220 ', a key input unit 230', And voice input / output unit 240 '.

The call processing application 220 'is an application for performing a call request while the user has the USB modem 100' mounted on the mobile terminal 200 'and supporting call processing accordingly. It can be provided in the form or mounted, and performs the setup by the voice call via the USB modem (100 ') according to the user input through the key input unit 230', and the analog incoming through the USB port 210 ' The voice signal is transmitted to the voice input / output unit 240 ', and the analog voice signal input from the voice input / output unit 240' is transmitted to the USB modem 100 '.

That is, in the present embodiment, since the PCM modulation and demodulation is performed by the USB modem 100 ', the portable terminal 200' only performs input / output of an analog voice signal without undergoing a separate voice codec process.

The call processing application 220 'is connected to a key input unit 230' for providing a user input signal for a call connection request and a voice input / output unit 240 'for analog voice signal input and output.

The voice call process by the system of FIG. 5 will now be described with reference to FIG. 6.

As shown in FIG. 6, when the USB modem 100 ′ having the mobile communication module 110 ′ is mounted on the USB port 210 ′ of the portable terminal 200 ′ and connected via an audio signal line (S601). The mobile terminal 200 'automatically or manually executes the call processing application 220' (S602).

When the user requests a call by inputting an incoming number through the call processing application 220 '(S603), the mobile terminal 200' transmits a call connection request signal including the called number to the USB modem 100 '. (S604), the USB modem 100 'reads the subscriber identification number stored in the USIM card 121' and transmits it to the exchange together with the called number through the mobile communication module 110 'to make a call connection with a specific called terminal. Request (S605).

Accordingly, the exchange obtains routing information of the called terminal through the home location register based on the called number, requests the incoming call to the called terminal through the exchange to which the called terminal belongs based on the corresponding routing information (S606), and responds to the called terminal. According to the call connection between the USB modem (100 ') and the exchange and the destination terminal is established (S607).

Accordingly, the voice signal transmitted from the called terminal to the USB modem 100 ', that is, PCM data, is demodulated as an audio signal processing, that is, an analog voice signal from the USB modem 100', and transmitted to the mobile terminal 200 '. When the analog voice signal is input from the mobile terminal 200 ', the USB modem 100' modulates it into PCM data and transmits it to the called party. Thus, a call path between the USB modem 100 'and the called terminal and the USB modem ( 100 ') and the voice call is made through the audio path between the mobile terminal 200' (S608 and S609).

On the other hand, Figures 4 and 6 as an embodiment for explaining the voice call process using a USB modem as described in the case of call originating as an example, if the USB modem and the mobile terminal is connected, the call is naturally possible, The voice call is performed by forming a voice call path between the USB modem and the mobile terminal in response to the user and executing the voice codec in the USB modem or the mobile terminal.

In addition, since the present invention relates to a system for providing a voice call service, the data service has not been described, but an additional configuration for providing a data service is provided because a USB modem designed for data service is intended to be used for a voice call service. It may include, it is also possible to be made for a voice call service only.

As those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features, the embodiments described above should be understood as illustrative and not restrictive in all aspects. Should be. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

Therefore, according to the voice call system and method using the USB modem of the present invention, the proposed USB modem can be utilized for the voice call service by providing an audio path and providing related applications. By utilizing a USB modem equipped with a module, it is possible to provide a voice call service with only a minimum of voice input and output means and a call processing application.

In addition, according to the present invention there is an effect that it is possible to prevent user complaints or loss of resources for the possession and duplication of the mobile communication module for use of the wireless Internet service and voice call service in advance.

Claims (10)

As a voice call system utilizing a USB modem, A mobile communication module for transmitting / receiving PCM data through a mobile communication network, a modem chip for setting a voice call through the mobile communication module and controlling a voice call service, a USIM card storing a subscriber identification number for accessing a mobile communication network, and the modem A USB modem equipped with a power module for supplying power to a chip and an external portable terminal USB port for transmitting the PCM data to the portable terminal through a USB port; A USB port for mounting the USB modem, a call processing application for performing setup by voice call through the USB modem according to a user input, and performing demodulation and demodulation of PCM data and analog voice signals, and a user input signal for a call connection request. A portable terminal including a key input unit for transmitting to the call processing application and a voice input / output unit for analog voice signal input / output; Voice call system utilizing a USB modem, characterized in that consisting of. The method of claim 1, The USB connector of the USB modem and the USB port of the mobile terminal are connected through a PCM data line, The call processing application, A call connection unit for performing setup by voice call through the USB modem; An audio codec which demodulates the PCM data input through the USB port and outputs the analog voice signal to the voice input / output unit as an analog voice signal, modulates the analog voice signal input from the voice input / output unit, and transmits the PCM data to the USB modem through the USB port. part; Voice call system utilizing a USB modem, characterized in that it comprises a. As a voice call system utilizing a USB modem, A mobile communication module for transmitting / receiving PCM data through a mobile communication network, a modem chip for setting a voice call through the mobile communication module and controlling a voice call service, a USIM card storing a subscriber identification number for accessing a mobile communication network, and the modem A power module for supplying power to the chip, an audio codec that modulates and demodulates PCM data and analog voice signals, and a USB connector that is equipped with an external portable terminal USB port to transmit analog voice signals to the portable terminal through the USB port. A USB modem; USB port for mounting the USB modem, a call processing application for setting up a voice call through the USB modem according to a user input, a key input unit for transmitting a user input signal for a call connection request to the call processing application, and an analog voice. A mobile terminal including a voice input / output unit for signal input / output; Voice call system utilizing a USB modem, characterized in that consisting of. The method of claim 3, The USB connector of the USB modem and the USB port of the mobile terminal are connected through an audio signal line, The audio codec, Demodulating the PCM data received through the mobile communication module and the modem chip and transmitting the analog voice signal to the mobile terminal through the USB connector as an analog voice signal, and modulating the analog voice signal received from the mobile terminal as the PCM data. Voice call system using a USB modem, characterized in that for transmitting to a mobile communication network through a mobile communication module. The method according to any one of claims 1 to 4, The USB modem is a dual band dual mode mobile communication modem, The mobile communication module includes a first mobile communication module and a second mobile communication module for accessing mobile communication networks of different communication methods. The modem chip is responsible for signal transmission and reception processing through the first modem chip and the second mobile communication module for the signal transmission and reception through the first mobile communication module, the first modem chip and the voice call path is interlocked Voice call system utilizing a USB modem, characterized in that it comprises a second modem chip. The method according to any one of claims 1 to 4, The mobile communication module, Duplexer for separating TX and RX signals; An RX chipset for frequency band processing of the RF signal received through the duplexer; TX chipset for frequency band processing of the transmitted RF signal transmitted from the modem chip; A power amplifier module for amplifying the power of the TX chipset output signal and transferring the power to the duplexer; Voice call system utilizing a USB modem, characterized in that it comprises a. A voice communication method between a USB modem having a mobile communication module and mounted as a USB port of a portable terminal and connected through a portable terminal and a PCM line, and the portable terminal equipped with the USB modem, A first step of executing, by the portable terminal, a call processing application when the USB modem is mounted; A second step of transmitting a call connection request signal including the called number to the USB modem through the USB port when the user requests the mobile terminal to input a called number and to connect a call; Transmitting, by the USB modem, a call connection request signal including the called number and the subscriber identification number of the USIM card included in the USB modem to the exchange of the mobile communication network through a mobile communication module; When the voice call path between the USB modem, the switch and the called terminal is set, PCM data is transmitted and received between the portable terminal and the USB modem, and the mobile terminal performs voice demodulation between the PCM data and the analog voice signal to make a voice call. The fourth step; Voice call method using a USB modem, characterized in that it comprises a. The method of claim 7, wherein The fourth step, When the portable terminal receives the PCM data from the USB modem, demodulating the PCM data to output an analog voice signal through the speaker, and if the analog voice signal is input through the microphone, and transmits the modulated PCM data to the USB modem. Voice call method utilizing a USB modem, characterized in that. A voice communication method comprising a USB modem having a mobile communication module and mounted as a USB port of a portable terminal and connected through a portable terminal and an audio signal line, and the portable terminal equipped with the USB modem. A first step of executing, by the portable terminal, a call processing application when the USB modem is mounted; A second step of transmitting a call connection request signal including the called number to the USB modem through the USB port when the user requests the mobile terminal to input a called number and to connect a call; Transmitting, by the USB modem, a call connection request signal including the called number and the subscriber identification number of the USIM card included in the USB modem to the exchange of the mobile communication network through a mobile communication module; When the voice call path between the USB modem, the switch and the called terminal is set, the USB modem performs an analog demodulation between the PCM data and the analog voice signal transmitted and received through the mobile communication network, and performs the analog voice signal transmission and reception with the mobile terminal. A fourth step of allowing the mobile terminal to perform an analog voice signal input / output through a speaker and a microphone to make a voice call; Voice call method using a USB modem, characterized in that it comprises a. The method of claim 9, In the fourth step, The USB modem transmits the analog voice signal demodulated from the mobile communication network to the mobile terminal through a USB port, modulates the analog voice signal input from the mobile terminal into PCM data and transmits the analog voice signal to the mobile communication network. Voice call method using a USB modem, characterized in that.

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