KR19980065539A - Portable communication device capable of calling through wired telephone network and method of performing the call - Google Patents

Abstract

Disclosed is a portable communication device capable of performing a call through a wired telephone network as well as wireless communication for a certain purpose. The disclosed portable communication device is connected to a public telephone network having an external interface having a line transfer switch and a connector for selecting a wireless call and a wired call in order to perform a wired call under a specific mode and forming a wired call path if necessary. It is done.

Description

Portable communication device capable of calling through wired telephone network and method of performing the call

1 is a device block diagram of a portable communication device according to the present invention.

2 is a diagram illustrating the use of the present invention.

3 is a diagram showing a connection relationship between a portable communication device and a wired telephone network according to the present invention.

4 is a block diagram of an entire system according to the present invention.

5 is a signal flow diagram of call performance through a wired telephone network according to the present invention.

6 and 7 are block diagrams of devices and external connectors of a conventional portable communication device.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable communication device such as a digital cellular phone, a cellular phone, and the like, and more particularly, to a portable communication device capable of performing a call through a mobile telephone network as well as wireless communication for a specific purpose, and a method of performing the call.

Typically, a portable communication device such as a cellular phone or the like is mounted on a vehicle or carried to a user to provide the user with the performance of two-way mobile wireless communications. In order to enable the portable communication device to communicate, the mobile communication base station is divided into cell sites to perform high frequency wireless communication with the portable communication device and to establish a call with a wired subscriber. It is connected to the telephone network (PSTN). For example, when a user of the portable communication device attempts to make a call with a called party in a certain office, if the user digits a telephone number installed in the called party's office through a keypad present in the portable communication device, the portable communication device Dialing is performed by a set operation between the base station and the base station. When the called party is not in a call, when the user hooks off, a call is formed and both parties perform a call. Such an operation of dialing and making a call corresponds to a general operation of the portable communication device, and thus is commonly referred to as a normal mode or a normal mode.

6 shows a brief internal hardware structure of a digital terminal (also known as a mobile phone) currently in use as a recent conventional technology. The terminal (mobile phone) receives an origination or terminated call through the keypad 5 to start the call. The voice processing unit inside the terminal is the same as the internal configuration shown by reference numeral 2. When a user's voice comes in through a microphone, the microphone converts it into an analog signal and outputs it to PCM 3. The PCM 3 processes the analog signal into a 32kbps PCM audio signal and outputs the same through the pcm_dout I / O pin. The signal enters Vocoder 4 in MSM chip 1, where it is converted into a digital bit. The digital bit is sent to the demodulator 6 to be set according to the CAI (Common Air Interface) to go to the base station through RF under the control of the control unit 7. In the case of incoming voice, data from RF is first demodulated by modulator 6 built in MSM chip 1, and then demodulated and sent to vocoder 4 to convert to PCM signal, and then through PCM_din pin. Provided by 3. PCM 3 converts the provided signal into an analog signal for audio output through a speaker. In both cases, the MSM chip 1 sends pcm_clk and pcm_sync to sample every 8ms.

FIG. 7 schematically shows a part 10 connected to an external connector in the external shape of the bottom of the terminal of FIG. In FIG. 7, reference numerals 20 and 30 denote RX and TX parts as parts connected to a serial port of an MSM chip inside the terminal. In addition, there is a control signal part for serial communication, which is mainly used for monitoring the terminal. Reference numeral 40 denotes a portion used to mute the earphone by being connected to the ear mute portion of the PC chip. As a result, the terminal can be monitored when the connector is connected through the part 10 connected to the external connector, and each information of the terminal can be read from the terminal through the serial port. In addition, if the terminal has a data service function such as a fax (fax) function like a PDA, the terminal may convert each data service information to CAI and transmit it to a destination through an RF channel.

However, the conventional terminal, i.e., a portable communication device, performs a wireless call in a normal mode and monitors a terminal when connecting a connector through a connector connection portion, but performs a call through a wired telephone network such as a PSTN or an ISDN network. There is a problem that can not be.

If wireless communication cannot be performed by the mobile phone due to deterioration of the wireless environment, or if the mobile phone cannot function properly due to discharge or consumption of the battery, it is highly desirable to make a call through the wired communication network. none. That is, the current mobile phone terminal is only able to operate in a wireless environment, so it is impossible to perform a wireless call when there is no wireless communication channel due to the expansion of a call or when there is no service area due to a complete cell plan. Do. In order to solve this problem, if a service provider installs a public box of a terminal similar to a general public telephone box and connects the terminal to a wired line to enable a call, the above inconvenience can be solved.

Accordingly, an object of the present invention is to provide a portable communication device capable of solving the above-mentioned conventional problems.

Another object of the present invention is to provide a portable communication device capable of performing a wired call and a method for performing the call.

Still another object of the present invention is to provide a portable communication device capable of performing a call through a wired telephone network as well as wireless communication, and a method of performing the call.

Portable communication terminal device of the present invention for achieving the above object, if necessary to provide a wired call with an external interface having a line transfer switch and a connector for selecting a wireless call and a wired call to perform a wired call under a specific mode Characterized in that connected to the public telephone network to form a.

Hereinafter, a device and a call execution method according to a preferred embodiment of the present invention will be described with the accompanying drawings. In the following description, specific details are set forth by way of example and in detail in order to provide a more thorough understanding of the present invention. However, for those skilled in the art, the present invention may be practiced by the above description without these details. In addition, the basic functions and operations of portable communication devices well known in the art are not described in detail in order not to obscure the subject matter of the present invention.

In the following description, a preferred embodiment of the present invention will be described by way of example only and with reference to the accompanying drawings.

First, a brief description is provided to help the understanding of the present invention. In the case of a communication device such as a conventional digital mobile phone, the user's voice analog signal is applied to PCM 3, processed into a PCM voice signal, and then output through the pcm_dout I / O pin. The signal enters vocoder 4 in MSM chip 1, where it is converted to a digital bit. However, the PCM signal is a signal used in a wired telephone connected to a PSTN network or an ISDN network, which is a public telephone network. Therefore, in the present invention by using this point, the service provider to install the public box of the terminal similar to the common public telephone box, and the portable communication device to enable the wired connection to the PSTN (or ISDN) network when the wire call is needed. Change the structure of the following (terminal). In addition, if the terminal also has the function of the information terminal can be used for data communication. The change of the structure of such a terminal basically uses the connector part used for the monitoring and the correction or observation of the internal information in the conventional terminal. That is, a wired call can be made by changing hardware inside a terminal and modifying a software part of a service provider, and in each case, a part for an internal interface is required. In addition, if the above method is further developed, a terminal having a facsimile function such as a PDA can be easily interfaced. Of course, you can also use a private branch exchange (PBX) or other termination device in your home or workplace. As a result, the present invention enables the user to use the terminal more widely in the use of the limited terminal, and gives the service provider an opportunity to provide differentiated services compared to other companies.

First, FIG. 1 is an apparatus block diagram of a portable communication device according to the present invention, and FIG. 2 is a use diagram shown to explain the use of the present invention. 3 is a diagram showing a connection relationship between a portable communication device and a wired telephone network according to the present invention, FIG. 4 is a configuration diagram of the entire system according to the present invention, and FIG. Signal flow diagram.

Referring to FIG. 1, the internal hardware structure of the terminal for direct connection to a wired telephone network, which is a public telephone network, is shown. When the external connection pin of FIG. 3 is connected to the external interface 14, the control part 7 of the terminal knows that the external power of reference 13 is input to the MSM chip 1 of FIG. 1 through the GP10pin 16 and connected to the external connection pin. . In addition, when the external power is supplied to 13 in FIG. 1, the external power is supplied to the power module 20 connected to the battery to drive the internal hardware. When supplying external power, pcm_dout coming from PCM 3 via MIC is transferred to port 12 in external interface 14 by a switch in logic circuit 60 in FIG. It is connected to the terminal public telephone network 7 of FIG. 3 via an external connector. On the other hand, pcm_din is applied to the logic circuit 10 through port 11 (PCM signal) of FIG. 1 and transferred. This goes to line 9 via PCM 3 to the speaker. In each case, since the external power is used as voc_select, vocoder 4 does not operate when the external power is supplied, so the line 50 does not operate. When external power is supplied and logic circuit 60 is activated, pcm_dout (PCM signal) from PCM 3 is transmitted as is through port 12 to the public telephone network of FIG. The control signals of the terminal are transmitted to the control unit 8 of FIG. 3 through a serial port of 15, and also transmit data information when using a data operation.

Referring to FIG. 2, the system operator allows the use of the terminal public telephone only when the user subscribes to this service. If many terminal public telephones are installed, the use of mobile phones is reduced, so it is desirable for the system operator to install only in the no service area or the basement to perform the function as a new service. In addition, it is considered that it is more useful to install in an area where ordinary public telephones and the like are not installed. It may be desirable to set the rate to be the same as that of a regular telephone or to set it less than a cellular phone rate in terms of expanding and disseminating subscribers.

Referring to FIG. 3, a connection configuration between the terminal and the terminal public telephone network 11 is shown. The terminal connects to the terminal public telephone network using the connector indicated by symbol 1, and when the connector 1 and the external interface 14 of FIG. 1 are connected, the terminal waits for the internal hardware to stabilize for a predetermined time (defined as Tsetup) and then The connection acknowledgment signal is sent to the control part 8 of the public telephone network 11 of the terminal through the serial port 2. At this time, since the terminal does not use a wireless environment, the power is cut off from the RF side (PA_ON signal). Disabled). The public telephone network responds to this signal with a connection acknowledgment signal. This signal is input to the terminal via serial port 3. Upon receipt of this signal, the terminal sends information, such as its MIN value, to the terminal public telephone network 11, which sends it to switch 9 (PSTN or ISDN). The exchange 9 detects whether a terminal wanting service in its DB has subscribed to the service and provides a service indication to the terminal public telephone network 11. The terminal indicates that the service is available on the LCD when the service indication data is logical 1, and in this case, the user operates the key of the terminal by deciding whether to attempt a call or send data by voice. Accordingly, the terminal transmits the corresponding flag to the control part 8 of the terminal public telephone network 11. The control part 8 which receives the flag determines whether the desired mode is voice or data and switches the switch 6 to suit each processing. When the switching is completed, the terminal gives a ready signal, and the terminal uses ports 2 and 3 for data and ports 4 and 5 for voice to perform a desired operation. In FIG. 5, the foregoing is shown in detail as a flowchart.

3 shows a 1: 1 correspondence structure between a terminal and a public telephone network, and FIG. 4 shows the overall system configuration. The terminal public telephone network 300 can be connected to the terminal public telephone box 100 of a predetermined capacity by wire. In addition, the exchange (PSTN or ISDN) is connected to a number of terminal public telephone networks 300 such as a, a, and many. Therefore, when several terminal public telephone boxes are bundled with the code 400, one terminal public telephone network 300 covers one area. And, several of these terminal public telephone network 300 is a structure in which one exchange is in charge. The database 200 stores the user's information to check whether the terminal can receive service when each user attempts to access the general network in the box 100. With this structure, as shown in the flowchart of FIG. 5, a user can make a call at a charge similar to that of a general telephone in any region with his terminal, and a service provider provides a differentiated service. In addition, if the present embodiment is expanded, the present invention can be extended to a digital cellular phone (DCP), a personal communication system (PCS), and the like, and can be applied to a general home. However, in this case, the installation of a new network is required or the function of the present invention should be added to the current network.

According to the present invention as described above, there is an effect of performing a call through a wired telephone network as well as wireless communication for a certain purpose. Accordingly, the service provider may provide a call service function through a wired telephone network, thereby expanding the service, thereby having a business advantage. In addition, the user has the advantage of reducing the burden of the telephone charges that can be caused by unnecessary wireless calls and the ability to make calls even in the situation where the battery, such as the end of the life can not make calls or wireless service is not available.

Although the above-described invention has been described and limited by way of example with reference to the drawings, the same will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention.

Claims (3)

In the signal control method for a wired call between a portable communication device, a terminal public telephone network, and a general telephone network with a wired call function, When the external interface of the communication device and the terminal public telephone network are connected to the connector, transmitting a connection acknowledgment signal after a predetermined time from the communication device and cutting off the power of a wireless block; Providing a connection actuation response signal from the public telephone network to the communication device; Transmitting information, such as a MIN value, to the terminal public telephone network in the communication device in response to the connection acknowledgment response signal; Sending the information from the public telephone network to the public telephone network; Transmitting a service indication to the communication device through the public telephone network after checking whether the communication device is subscribed to a wired call service; Transmitting flag information indicating voice or data transmission when a service is available to the public telephone network; Switching a transmission mode according to the flag information and sending a ready signal to the communication device; Making a call by the communication device and forming a call path and transmitting a call signal. In a portable communication terminal device, a portable communication terminal device having an external interface having a line switching switch and a connector for selecting a wireless call and a wired call in order to perform a wired call under a specific mode and being connected to a public telephone network that forms a wired call path if necessary. Characterized in that the device. In a portable communication terminal device, A microphone for inputting a voice signal, A speaker for outputting an audio signal, A high frequency module for restoring a voice signal from a high frequency signal propagated in the air and supplying the voice signal to the speaker, modulating the voice signal from the microphone into a high frequency signal, and transmitting the voice signal to the air; A PCM module for converting a digital signal to be supplied from the high frequency module to the speaker as an analog signal and converting an analog signal to be supplied from the microphone to the high frequency module into a digital signal, and performing data communication with the high frequency module; A switching switch for connecting the PCM module to either one of the high frequency module and external connection terminals; A voice processing means connected to the transfer switch by a connector to relay a voice signal between the transfer switch and the public telephone network; And data processing means connected to said transfer switch by said connector to relay data between said transfer switch and a public telephone network.