KR100383239B1 - Citizen band a combined use mobile station and control method - Google Patents

Abstract

The present invention relates to a unidirectional radio combined terminal and a control method thereof, and in particular, a key input unit 200 for outputting a radio communication mode signal or a mobile communication mode signal and outputting a frequency selection signal; Receives the radio communication mode signal or the mobile communication mode signal and sets the corresponding radio communication mode or mobile communication mode, and outputs the source for local frequency generation according to the corresponding specification when receiving the frequency selection signal in the radio communication mode. MSM (100); And a frequency processor 310 for receiving a local frequency generation source according to a specification and supplying a local frequency corresponding thereto, and receiving a local frequency from the frequency processor and mixing and outputting a signal from the MSM and antenna. The RF transceiver 300 includes a mixer, an amplifier for amplifying a gain of a signal, and a filter for removing noise generated in the amplified signal. The present invention uses an internal circuit of an existing terminal. By adding the functions of the current radio to enable individual communication, the CDMA communication can be used in unstable times or regions, thereby improving the performance of the system and providing a good call quality to the user.

Description

One-way radio combined terminal and control method {CITIZEN BAND A COMBINED USE MOBILE STATION AND CONTROL METHOD}

The present invention relates to a unidirectional radio combined terminal and a control method thereof, and more particularly, to a user of a CDMA mobile communication terminal using a conventional wireless modem and a radio local signal of a combination of CDMA (Code Division Multiple Access) / FM (Frequency Modulation). The present invention relates to a unidirectional radio combined terminal using a unidirectional living radio through a terminal having a PLL (Phase Locked Loop) to be supplied, and a control method thereof.

In general, radios are divided into industrial, domestic, and simple-frequency communication radios according to their frequency and use. Industrials can be divided into general radio stations and simple radio stations. A simple radio station is used only by a person with a business registration certificate for the frequency band designated by the government. At this time, the industrial radio uses 136 ~ 172Mhz, 444Mhz frequency band, general radio station is used for police, fire department, and military, simple radio station is mainly used in building security, factory security, broadcasting system. In addition, the domestic radio was first introduced in 1995 in Korea to activate wireless communication of general consumers. It is a type 2 living radio station that uses a shortwave frequency of 27Mhz and a second type that uses microwave and microwave frequencies of 440Mhz. Are distinguished.

In a general CDMA mobile communication system, when a user of a CDMA mobile communication terminal wants to communicate with another terminal through his / her own terminal, the user of the CDMA mobile communication terminal must communicate with the control station and the switching center through the channel card in the base station. Through the register process and the call processing process of HLR (Home Location Register), the call was established after establishing a call with another terminal.

However, in the above-described general CDMA mobile communication system, a user can make a call only through a base station, a control station, and a switching station in order to communicate with another terminal through call setup of the terminal. In the case of a call congestion, and a call incapacity area, there was a problem in that a call cannot be made with another terminal.

Accordingly, the present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a short range between a terminal and a specific terminal regardless of a base station, a control station, and a switching station in an area where CDMA mobile communication is unstable or impossible. In the present invention, there is provided a one-way radio terminal and a control method thereof, which enable communication of individual radios.

In order to achieve the above object, the present invention provides a mobile communication terminal including a microphone, a speaker, and a display unit.

A key input unit for outputting a radio communication mode signal or a mobile communication mode signal corresponding to the user's key selection, and outputting a frequency selection signal;

Receiving a radio communication mode signal or a mobile communication mode signal from the key input unit and setting a corresponding radio communication mode or a mobile communication mode, and generating a local frequency according to the corresponding specification when receiving a frequency selection signal in the radio communication mode MSM output source for; And

A frequency processor for receiving a local frequency generation source according to a specification from the MSM and supplying a local frequency corresponding thereto, and a mixer for receiving a local frequency from the frequency processor and mixing and outputting a signal from the MSM and the antenna. And an RF transceiver comprising an amplifier for amplifying the gain of the signal and a filter for removing noise generated in the amplified signal.

In addition, in order to achieve the above object, the present invention provides a method for controlling a unidirectional radio combined terminal, comprising: a first step in which an MSM determines whether a radio communication mode or a mobile communication mode is input from a key input unit according to a user's key selection; ;

A second step of setting, by the MSM, a radio terminal mode to a radio communication mode when the radio communication mode is input from the key input unit in the first step;

A third step of receiving, by the MSM, a frequency selection signal from the key input unit according to a user's key selection;

When the MSM receives the frequency selection signal from the key input unit, a local frequency generation source (R, N, PRE) according to a specification corresponding to the frequency selection signal is respectively obtained by a gain amplifier unit, a frequency stabilizer unit, and A fourth step of outputting each to a gain control unit;

A fifth step of outputting, by the MSM, the local frequency input from the frequency processor to another terminal for communicating with each other through the RF transceiver; And

And a sixth step in which the MSM receives a local frequency identical to its local frequency from the other terminal for communicating with each other through the RF transceiver.

1 is a functional block diagram showing the configuration of a unidirectional radio combined radio terminal according to an embodiment of the present invention,

2 is a functional block diagram showing a detailed configuration of a frequency processing unit of the one-way radio terminal according to Figure 1,

3 is a flowchart illustrating a method of controlling a unidirectional radio combined terminal according to an embodiment of the present invention.

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

100: MSM 200: key input unit

300: RF transceiver 310: frequency processing unit

311: frequency generator 312: gain amplifier

313: phase comparator 314: loop filter

315: voltage controlled oscillator 316: gain control unit

317: frequency stabilizer

Hereinafter, a one-way radio terminal and a control method thereof according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a functional block diagram of a unidirectional radio combined terminal according to an embodiment of the present invention, a unidirectional radio combined dual terminal according to an embodiment of the present invention MSM (Mobile Station Modem; referred to as "MSM".) 100, a key input unit 200, and an RF (Radio Frequency) transceiver unit 300. At this time, a microphone 10 for receiving a voice from the user and converting the voice into a voice signal and outputting the voice signal to the MSM 100, and a speaker for receiving the voice signal from the MSM 100 and converting the voice signal into voice. (Speaker) 20, a display unit 30 for displaying the current communication mode (Mode) state, the radio communication state to the user (Display).

The MSM 100 receives a radio communication mode signal or a mobile communication mode signal from the key input unit 200 and sets a mode corresponding thereto, and when receiving the frequency selection signal, the MSM 100 receives a local according to a corresponding specification. Local) serves to output the frequency generation source to the frequency processor 310. At this time, the source for generating a local frequency according to the specification includes a source (R) for adjusting the gain of the frequency, a source (PRE) for controlling the gain magnitude of the generated loop backed local frequency, and a gain-limited local frequency. It is the source (N) that receives the input and adjusts the gain of the local frequency.

In addition, the key input unit 200 outputs a corresponding radio communication mode signal or a mobile communication mode signal to the MSM 100 as the user selects a key, and outputs a frequency selection signal to the MSM 100. It plays a role.

The RF transceiver 300 receives a local frequency generation source according to a specification corresponding to a communication mode from the MSM 100 and includes a frequency processor 310 for supplying a local frequency corresponding thereto. It serves to modulate / demodulate a voice or a voice signal through, and as shown in FIG. 2, the frequency processor 310 includes a frequency oscillator 311, a gain amplifier 312, a phase comparator 313, and a loop. The filter includes a loop filter 314, a voltage controlled oscillator 315, a gain adjuster 316, and a frequency stabilizer 317. At this time, the local frequency is received from the frequency processor 310 and at the same time the signal from the MSM (100) and the antenna to mix and output the mixer, the amplifier to amplify the gain of the signal, and generated in the amplified signal It further comprises a filter for removing noise.

The frequency oscillator 311 generates a basic frequency to generate a frequency used for CDMA mobile communication and a local frequency used for each radio communication, and outputs the fundamental frequency to the gain amplifier 312. At this time, the frequency oscillator 311 is a frequency oscillator (Oscillator) of 19.68Mhz, and needs high stability against frequency accuracy and changes according to temperature or usage time. In addition, the oscillation spectrum should be clean, and the noise component should be small (good C / N). In general, the comparison frequency of the phase comparator is 1KHz ~ 100Khz, and it is common to use 3Mhz ~ 15Mhz for the economical crystal oscillator.

In addition, when the source for generating a local frequency is input from the MSM 100, the gain amplifier 312 calculates a source of the fundamental frequency received from the frequency oscillator 311 and outputs the source to the phase comparator 313. Play a role.

The phase comparator 313 receives the fundamental frequency calculated from the gain amplifier 312 and receives the local frequency looped back and receives an error voltage signal corresponding to the phase difference between the two frequencies. It plays a role as output. In this case, the phase comparator 313 may be of analog type or digital type, but an analog phase comparator is usually a double balance mixer type. This analog type is excellent in signal tracking and recovery. On the other hand, the digital mode mode identification of the phase and frequency between the two input signals prevents the voltage-controlled oscillator from locking to the incorrect frequency, and the phase transfer function is not only linear over ± 2 radians of phase error, but also logic level. If (Logic Level) is satisfied, amplitude change is not severe. In addition, since the phase difference zero is in a zero lock state and the residual of the phase difference to be filtered is very low, a digital phase comparator is used more than an analog phase comparator for the above reason.

In addition, the loop filter 314 receives an error voltage from the phase comparator 313, removes a ripple component of the error voltage signal, and converts an AC voltage from which the ripple component is removed to a DC voltage to generate the voltage controlled oscillator. It outputs to 315. In this case, the loop filter 314 may be divided into an active filter and a passive filter. In the passive filter, the gain of the phase comparator may vary greatly in the upper and lower portions of the voltage controlled oscillator frequency range. Not only is a degree of phase error necessary to maintain the look, but there is also no AC gain, so the output of the phase comparator needs to be able to supply a significant direct current to the voltage controlled oscillator variation range. On the other hand, the active filter is composed of an OP amplifier or a transistor, and because the DC gain is large, the control range of the voltage controlled oscillator is wide, the input leakage current from the phase comparator is small, and there is almost no phase error. Noise components may occur.

In addition, the voltage control oscillator 315 receives a DC voltage from the loop filter 314 and controls a gain variation of the DC voltage and a load condition variation, and then adjusts the specific frequency corresponding to the DC voltage to the gain control unit. At this time, the voltage controlled oscillator 315 uses high spectral purity and good linearity with respect to the control voltage. In addition, a varistor diode (Diode) is most often used as a variable element, and not many ICs are used, rather individual components are used.

In addition, the gain adjusting unit 316 receives a local frequency generation source according to a specification from the MSM 100 and limits the magnitude of the gain of the local frequency output from the voltage controlled oscillator 315 to the frequency stabilizer. It outputs to (317).

The frequency stabilizer 317 receives a local frequency generation source according to a specification from the MSM 100, calculates a gain of a local frequency whose gain is limited by the gain adjuster 316, and calculates the phase comparator. 313).

At this time, the gain amplifier 312, the gain control unit 316, and the frequency stabilizer 317 receives the respective sources (R, N, PRE) from the MSM (100) as follows. Using the same Equation 1, arithmetic local frequencies are generated.

Here, F (o) means a local frequency supplied to the mixer, F (i) is a source frequency for generating a local frequency supplied to the mixer, the source (R) is the gain of the source frequency While the source PRE is looped back to the generated local frequency to control the gain of the local frequency to be looped back, and the source N receives the gain-limited local frequency to adjust the gain of the local frequency. do.

Next, a method of controlling the one-way radio combined terminal having the above configuration will be described with reference to FIG. 3.

First, the MSM 100 determines whether any one of a radio communication mode and a mobile communication mode is input from the key input unit 200 according to a user's key selection (S1).

Subsequently, when the radio communication mode is input from the key input unit 200 in the first step S1 (YES), the MSM 100 sets the mode of the wireless terminal to the radio communication mode (S2).

The MSM 100 receives a frequency selection signal from the key input unit 200 according to a user's key selection (S3).

Subsequently, when the MSM 100 receives the frequency selection signal from the key input unit 200, each of the frequency processing unit 310 according to the specifications of the source R, N, and PRE corresponding to the frequency selection signal is received. It outputs to the internal gain amplifier 312, the frequency stabilizer 317, and the gain adjuster 316 (S4).

The MSM 100 receives a local frequency from the frequency processor 310 and outputs the local frequency to another terminal for individual radio communication through the RF transceiver 300 (S5).

Subsequently, the MSM 100 receives a local frequency equal to its local frequency through the RF transceiver 300 from another terminal for communication of each radio (S6).

On the other hand, when the mobile communication mode is input from the key input unit 200 in the first step (S1), the MSM 100 sets or maintains the mode of the wireless terminal to the mobile communication mode (S7).

As described above, according to the present invention, the unidirectional radio combined terminal and the control method thereof allow a user to communicate with a specific terminal using a terminal without using a base station and an exchange in an area where CDMA communication is unstable. In addition, this can increase the number of subscribers that can be accommodated in a system, and has the outstanding effect of improving the performance of the system and improving the call quality and success rate for the user.

Claims (6)

In the mobile communication terminal having a microphone, a speaker, and a display unit, A key input unit for outputting a radio communication mode signal or a mobile communication mode signal corresponding to the user's key selection, and outputting a frequency selection signal; Receiving a radio communication mode signal or a mobile communication mode signal from the key input unit and setting a corresponding radio communication mode or a mobile communication mode, and generating a local frequency according to the corresponding specification when receiving a frequency selection signal in the radio communication mode MSM output source for; And A frequency processor for receiving a local frequency generation source according to a specification from the MSM and supplying a local frequency corresponding thereto, and a mixer for receiving a local frequency from the frequency processor and mixing and outputting a signal from the MSM and the antenna. And an RF transceiver comprising an amplifier for amplifying a gain of a signal and a filter for removing noise generated in the amplified signal. The method of claim 1, The frequency processor may include: a frequency oscillator for generating and outputting a basic frequency (19.68Mhz) to supply a frequency used for CDMA mobile communication and a local frequency used for each radio communication; A gain amplifying unit which receives a source R according to a specification from the MSM and calculates and outputs a source R of a fundamental frequency (19.68Mhz) received from the frequency oscillator; A phase comparator which receives the calculated frequency from the gain amplifier and simultaneously receives the loopbacked frequency and outputs an error voltage corresponding to the phase difference between the two frequencies; A loop filter which receives an error voltage from the phase comparator and removes a ripple component of the error voltage and converts an AC voltage from which the ripple component is removed to a DC voltage and outputs the DC voltage; A voltage controlled oscillator for receiving a DC voltage from the loop filter and controlling a gain variation of the DC voltage, a load condition variation, and outputting a specific frequency corresponding to the gain of the DC voltage; A gain adjuster which receives a source according to a specification from the MSM and limits a magnitude of a gain of a specific frequency looped back from the voltage controlled oscillator; And And a frequency stabilizer for receiving a source (N) according to specifications from the MSM and calculating a gain of a specific frequency whose gain is limited from the gain adjuster and outputting the gain to the phase comparator. The method of claim 1, And a method for generating a local frequency supplied to the mixer by using a source for generating a local frequency by the frequency processor in the RF transceiver. The unidirectional radio combined terminal as described in Equation 1 below. [Equation 1] Here, F (o) means a local frequency supplied to the mixer, F (i) is a source frequency for generating a local frequency supplied to the mixer, the source (R) is the gain of the source frequency While the source PRE is looped back to the generated local frequency to control the gain of the local frequency to be looped back, and the source N receives the gain-limited local frequency to adjust the gain of the local frequency. I mean. A first step of determining, by the MSM, whether a radio communication mode or a mobile communication mode is input from a key input unit according to a user's key selection; A second step of setting, by the MSM, a radio terminal mode to a radio communication mode when the radio communication mode is input from the key input unit in the first step; A third step of receiving, by the MSM, a frequency selection signal from the key input unit according to a user's key selection; When the MSM receives the frequency selection signal from the key input unit, a local frequency generation source (R, N, PRE) according to a specification corresponding to the frequency selection signal is respectively obtained by a gain amplifier unit, a frequency stabilizer unit, and A fourth step of outputting each to a gain control unit; A fifth step of outputting, by the MSM, the local frequency input from the frequency processor to another terminal for communicating with each other through the RF transceiver; And And a sixth step of receiving, by the MSM, a local frequency equal to its local frequency from the other terminal for communicating with each other through the RF transceiver. The method of claim 4, wherein In the fourth step, the source for generating a local frequency according to the specification output by the MSM includes: a source (R) for adjusting a gain of a source frequency and a generated loopbacked local frequency to control a gain magnitude of the looped local frequency; And a source (N) for receiving a source (PRE) and a gain-limited local frequency and adjusting a gain of the local frequency. The method of claim 4, wherein When the mobile communication mode is input from the key input unit in the first step, the MSM further comprises a seventh step of setting or maintaining the mode of the wireless terminal to the mobile communication mode, characterized in that for controlling the wireless one-way radio terminal Way.