KR20010104076A - Transeiver device with pager in cdma mobile communication phone - Google Patents

Abstract

The present invention relates to a transmitting / receiving device having a wireless pager function in a CDMA terminal, and more particularly, to a CDMA terminal which enables a call to a wireless pager in a weak field of the terminal by adding a wireless pager function to the mobile communication terminal. The present invention relates to a transmitting / receiving device having a wireless pager function, and according to the present invention, a transmitting / receiving device having a wireless pager function in a CDMA terminal does not require a user to have a terminal and a wireless pager separately. In addition to savings, it is possible to receive a call with a wireless pager in a weak electric field where the terminal cannot be received, thereby providing various and higher quality mobile communication services to users.

Description

TRANSEIVER DEVICE WITH PAGER IN CDMA MOBILE COMMUNICATION PHONE}

The present invention relates to a transmitting / receiving device having a wireless pager function in a Code Division Multiple Access (CDMA) terminal, and more particularly, to a wireless pager in a weak field region of a terminal by adding a wireless pager function to a mobile communication terminal. A transmitting / receiving device having a wireless pager function in a CDA terminal that enables calling.

As is well known, currently used CDMA mobile communication terminals provide not only voice communication services but also data communication services such as texts to users. Such terminals usually use frequencies in the 800 MHz or 1800 MHz band, and in the case of wireless pagers, Uses a frequency in the 300MHz band. In the following description, a transmitter / receiver having a pager function in a CDM terminal according to the present invention takes a frequency of 800 MHz in the case of a terminal, and a frequency in the 300 MHz band in the case of a wireless pager.

In the conventional CDMA terminal, the transmitting / receiving apparatus includes: an up / down reference frequency generator 10 for generating a reference frequency; MSM 20; An IFT 31 for receiving a digital voice / data signal from the MSM 20 and converting it into an IF signal, and the IFT

A transmission side IF SAW filter 32 which passes only a desired band among the IF signals output from 31, an IF signal output from the IF SAW filter 32 and a reference output from the up / down reference frequency generator 10 An up-mixer 33 for mixing the frequency and converting the signal into an RF signal, a power amplifier 34 that receives the RF signal from the up-mixer 33 and amplifies the transmission power, and outputs the power amplifier 34. An RF transmitter 30 comprising an isolator 35 for bypassing the RF signal and preventing the receiver signal from flowing backward; A low noise amplifier 41 for receiving and amplifying an RF signal from a base station, a receiving RF SAW filter 42 passing only a desired band of the RF signals output from the low noise amplifier 42, and the receiving RF SAW filter 42 Output RF signal and the up / down reference frequency generator (1

A down-mixer 43 for mixing the reference frequency output from 0) into an IF signal, a receiving side IF SAW filter 44 for passing only a desired band among the IF signals output from the down-mixer 43, and the An RF receiver 40 comprising an IFR 45 for receiving an IF signal from the receiver IF SAW filter 44 and converting the IF signal into digital voice data; And a duplexer 50 which transmits the RF signal output from the RF transmitter 30 through an antenna and passes the RF signal received through the antenna to the RF receiver 40.

However, in the conventional CDMA terminal, the transmission / reception apparatus has a problem in that reception is not performed in the weak field of the mobile communication terminal. To solve this problem, many users have a separate wireless pager. As the user increases the cost of the user, there is also an uncomfortable problem of having to carry two devices separately.

Accordingly, the present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to enable users to make a call to a wireless pager in a weak electric field where a terminal cannot be received. The present invention provides a transmitting / receiving device having a radio pager function in a CDA terminal for providing a high mobile communication service.

In order to achieve the above object, a transmission / reception device having a radio pager function in a CDMA terminal of the present invention includes an up / down reference frequency generator for generating a reference frequency;

An MSM outputting a terminal control signal when the RF signal received from the base station is an RF signal in an 800 MHz band, and outputting a wireless pager control signal when the RF signal received from the base station is an RF signal in a 300 MHz band;

An IFT that receives digital voice / data signals from the MSM and converts them into IF signals, and receives a terminal control signal from the MSM and receives an IF signal of 800 MHz band from the IFT and passes only the desired band of the IF signal. Upon receiving the pager control signal from the MSM and receiving an IF signal in the 300 MHz band from the IFT, a transmitter side IF SAW filter unit for passing only a desired band of the IF signal and the IF side SAW filter unit transmit an IF signal. An up-mixer that mixes with the reference frequency output from the up / down reference frequency generator and converts it into an RF signal after receiving the input, and receives the terminal control signal from the MSM and at the same time the RF signal of 800 MHz band in the up-mixer When the signal is input, only the desired band of the RF signal is passed while the pager control signal is received from the MSM. When receiving the RF signal of the 300MHz band from the up-mixer at the same time, the RF side of the RF SAW filter unit to pass only the desired band of the RF signal, and receives the RF signal of 300 MHz band from the RF side SAW filter unit Bypass the power TR to amplify as much as the transmission power and output the power signal, a power amplifier to amplify and output an 800 MHz band RF signal from the transmitting RF SAW filter unit, and amplify as much as the transmission power, and the RF signal output from the power amplifier. An RF transmitter configured to isolate the receiver signal from being reversed;

A low noise amplifier receiving an RF signal transmitted from a base station and simultaneously amplifying the RF signal, and receiving a terminal control signal from the MSM and receiving an RF signal of 800 MHz band from the low noise amplifier, only a desired band of the RF signal Receiving side RF SAW filter unit that passes only the desired band of the RF signal when the RF signal of 300MHz band is received from the low noise amplifier while receiving a pager control signal from the MSM, and RF from the RF SAW filter unit. A down-mixer that converts an IF signal by mixing the reference frequency output from the up / down reference frequency generator after converting the signal into an IF signal, and receives a terminal control signal from the MSM and simultaneously receives an 800 MHz band in the down-mixer. When receiving an IF signal, only the desired band of the IF signal is passed while the MS Receiving a pager control signal from M and receiving a 300 MHz band IF signal from the down-mixer, a receiving side IF SAW filter unit which passes only a desired band of the IF signal, and an IF from the receiving side IF SAW filter unit. An RF receiver configured to receive an input signal and convert the digital voice data into an IFR; And

The RF signal of the 800MHz or 300MHz band output from the RF transmitter to the base station through the antenna, while the RF signal of the 800MHz or 300MHz band received through the antenna is characterized in that it consists of a duplexer unit.

1 is a functional block diagram showing the configuration of a transmitting / receiving apparatus in a general CDMA terminal;

2 is a functional block diagram showing the configuration of a transmitting / receiving device having a radio pager function in a CDA terminal according to an embodiment of the present invention.

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

100: up / down reference frequency generator 200: MSM

300: RF transmitter 310: IFT

320: transmitting side IF SAW filter unit 321: first transmitting side IF SAW filter

322: second transmitting side IF SAW filter 330: up-mixer

340: transmitting side RF SAW filter unit 341: first transmitting side RF SAW filter

342: Second transmitting side RF SAW filter 350: Power TR

360: power amplifier 370: isolator

400: RF receiver 410: low noise amplifier

420: receiving side RF SAW filter unit 421: first receiving side RF SAW filter

422: second receiving side RF SAW filter 430: down-mixer

440: receiving side IF SAW filter 441: first receiving side IF SAW filter

442: second receiving side IF SAW filter 450: IFR

500: duplexer 510: first duplexer

520: second duplexer

SW1 to SW9: first to ninth switches

Hereinafter, a transmitter / receiver having a pager function in a CDMA terminal according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a functional block diagram of a transmitter / receiver having a wireless pager function in a CDM terminal according to an embodiment of the present invention, and the transmitter / receiver having a wireless pager function in a CDMA terminal according to an embodiment of the present invention. The apparatus includes an up / down reference frequency generator 100; MSM (Mobile Station Manager; hereinafter referred to as MSM) 200; IFT (Intermediate Frequency Transmit) (hereinafter referred to as IFT) 310, the transmitting side IF SAW filter unit 320, the up-mixer 330, the transmitting side RF SAW filter unit 340, power TR An RF transmitter 300 comprising a 350, a power amplifier 360, and an isolator 370; Low noise amplifier 410, receiving side RF SAW filter unit 420, down-mixer 430, receiving side IF SAW filter unit 440, IFR (Intermediate Frequency Receiver) (hereinafter referred to as IFR) RF receiving unit 400 consisting of 450; And a duplexer unit 500.

The up / down reference frequency generator 100 generates a reference frequency and outputs the up-mixer 330 or the down-mixer 430.

In addition, when the RF signal received from the base station is an RF signal in the 800 MHz band, the MSM 200 outputs a terminal control signal to the first to ninth switches SW1 to SW9 while the RF signal received from the base station is output. In the case of an RF signal in the 300MHz band, the pager control signal is output to the first to ninth switches SW1 to SW9.

The IFT 310 mounted in the RF transmitter 300 receives a digital voice / data signal from the MSM 200, converts the digital voice / data signal into an IF signal, and outputs the IF signal to the transmitter IF SAW filter unit 320.

In addition, the transmitter IF SAW filter unit 320 mounted in the RF transmitter 300 receives a terminal control signal from the MSM 200 and receives an IF signal of 800 MHz band from the IFT 310. Passes only the desired band of the IF signal, while receiving a pager control signal from the MSM 200 and simultaneously receiving a 300MHz band IF signal from the IFT 310 serves to pass only the desired band of the IF signal. . In the transmitting side IF SAW filter unit 320, the first transmitting side IF SAW filter 321 used for the 800 MHz band, the second transmitting side IF SAW filter 322 used for the 300 MHz band, and the first switch SW1. , And the second switch SW2.

Meanwhile, the up-mixer 330 mounted inside the RF transmitter 300 receives an IF signal from the transmitter IF SAW filter 320 and outputs the signal from the up / down reference frequency generator 100. After mixing with a reference frequency to convert the RF signal to the RF side SAW filter unit 340 outputs.

In addition, the transmitting side RF SAW filter unit 340 mounted inside the RF transmitter 300 receives a terminal control signal from the MSM 200 and simultaneously receives an RF signal of an 800 MHz band from the up-mixer 330. When received, only the desired band of the RF signal is passed while the wireless pager control signal is received from the MSM 200 and at the same time when the RF signal of 300MHz is input from the up-mixer 330, only the desired band of the RF signal is received. It serves to pass. In this transmitting side RF SAW filter unit 340, the first transmitting side RF SAW filter 341 used in the 800 MHz band, the second transmitting side SAW filter 342 used in the 300 MHz band, and a third switch (SW3). It is composed of

The power TR 350 mounted inside the RF transmitter 300 receives a 300 MHz band RF signal from the transmitter RF SAW filter unit 340 and amplifies the RF signal as much as the transmission power, and then the second power inside the duplexer 500. It serves to output to the duplexer 520.

The power amplifier 360 mounted inside the RF transmitter 300 receives an 800 MHz band RF signal from the transmitter RF SAW filter unit 340, amplifies an RF signal by a transmission power, and passes the isolator 370 to pass the amplified signal. Outputs to the first duplexer 510 in the duplexer unit 500.

The isolator 370 in the RF transmitter 300 bypasses the RF signal output from the power amplifier 360 and prevents the receiver signal from flowing backward.

Meanwhile, the low noise amplifier 410 mounted inside the RF receiver 400 receives the RF signal transmitted from the base station, amplifies the RF signal, and outputs the RF signal to the receiver RF SAW filter unit 420. Do it.

In addition, the receiving side RF SAW filter unit 420 mounted inside the RF receiver 400 receives a terminal control signal from the MSM 200 and simultaneously inputs an RF signal of 800 MHz band from the low noise amplifier 410. Upon receiving only the desired band of the RF signal, while receiving the pager control signal from the MSM 200 and receiving the RF signal of the 300MHz band from the low noise amplifier 410, only the desired band of the RF signal is passed. Play a role. In the receiving RF SAW filter unit 420, the first receiving side RF SAW filter 421 used in the 800 MHz band, the second receiving side SAW filter 422 used in the 300 MHz band, and the fourth switch SW4. And a fifth switch SW5.

The down-mixer 430 mounted inside the RF receiver 400 receives a RF signal from the receiver RF SAW filter 420 and then outputs the reference frequency output from the up / down reference frequency generator 100. After mixing with each other to convert to an IF signal and serves to output to the receiving side IF SAW filter unit 440.

In addition, the receiving IF SAW filter unit 440 mounted inside the RF receiver 400 receives a terminal control signal from the MSM 200 and simultaneously receives an 800 MHz band IF signal from the down-mixer 430. When received, only the desired band of the IF signal is passed while the wireless pager control signal is received from the MSM 200, and the down-mixer 430 receives an IF signal of 300 MHz band, and only the desired band of the IF signal is received. It serves to pass. In the receiving side IF SAW filter unit 440, the first receiving side IF SAW filter 441 used in the 800 MHz band, the second receiving side IF SAW filter 442 used in the 300 MHz band, and the sixth switch SW6. And a seventh switch SW7.

The IFR 450 mounted in the RF receiver 400 receives an IF signal from the receiver IF SAW filter unit 440, converts an IF signal into digital voice data, and outputs the digital voice data to the MSM 200.

On the other hand, the duplexer 500 transmits the RF signal of the 800MHz or 300MHz band output from the RF transmitter to the base station through the antenna, while receiving the RF signal of the 800MHz or 300MHz band received through the antenna to the RF receiver 400 Serves to pass through. The duplexer unit 500 includes a first duplexer 510 for the 800 MHz band, a second duplexer 520 for the 300 MHz band, an eighth switch SW8, and a ninth switch SW9.

Next, the operation of the transmitter / receiver having the pager function in the CDMA terminal having the above configuration will be described with reference to FIG. 2.

First, the IFT 310 mounted in the RF transmitter 300 receives a digital voice / data signal from the MSM 200 and converts the digital voice / data signal into an IF signal, and then, in the first IF SAW filter unit 320 in the transmitter IF SAW filter 320. Supply to switch SW1.

In this case, the first switch SW1 connects the IFT 310 and the first transmitting side IF SAW filter 321 when the terminal control signal is input from the MSM 200, and wirelessly connects the MSM 200. When the pager control signal is received, the IFT 310 and the second transmitting side IF SAW filter 322 are connected.

Accordingly, when the first transmitting side IF SAW filter 321 receives an IF signal of 800 MHz band from the IFT 310, only the desired band of the IF signals is passed, and the second transmitting side SA SA filter 322 receives the IF signal. When the IFT 310 receives an IF signal of 300 MHz band, only the desired band of the IF signal is passed. In addition, a second switch SW2 is connected to an output terminal of the first transmission-side IF SAW filter 321 and the second transmission-side IF SAW filter 322.

Then, the up-mixer 330 receives an IF signal of 800 MHz or 300 MHz band from the first transmitting side IF SAW filter 321 or the second transmitting side IF SAW filter 322 and then performs the up / down reference frequency. Mixed with the reference frequency output from the generator 100 is converted into an RF signal.

In addition, when the transmitting-side RF SAW filter unit 340 receives an RF signal of an 800 MHz band from the up-mixer 330, a first transmitting-side RF SAW filter 341 which passes only a desired band of the RF signals, and When the RF signal of the 300 MHz band is received from the up-mixer 330, a second transmitting side RF SAW filter 342 which passes only a desired band of the RF signals is connected in parallel to the third switch SW3. When the switch SW3 receives the terminal control signal from the MSM 200, the switch SW3 connects the up-mixer 330 and the first transmitting side RF SAW filter 341, and the wireless pager control signal from the MSM 200. When the input is received, the up-mixer 330 and the second transmitting side SAW filter 342 are connected.

Then, the power TR 350 receives an RF signal of 300 MHz band from the second transmitting side RF SAW filter 342, amplifies the RF signal by the transmission power, and outputs the RF signal to the second duplexer 520. Thereafter, the second duplexer 520 transmits an RF signal of 300 MHz band to the base station through an antenna.

In addition, the power amplifier 360 receives the RF signal of the 800MHz band from the first transmitting side RF SAW filter 341 and amplifies and outputs the power as much as the transmission power, and in the isolator 370, the power amplifier 360 Bypasses the output RF signal while preventing the receiver signal from flowing back. In this case, the first duplexer 510 transmits an RF signal of an 800 MHz band to the base station through an antenna.

Accordingly, the RF signal for the terminal is transmitted through the first duplexer 510, and the RF signal for the pager is transmitted through the second duplexer 520.

Meanwhile, the low noise amplifier 410 receives the RF signal transmitted from the base station through the first duplexer 510 or the second duplexer 520 in the duplexer unit 500 and amplifies the RF signal at the same time. Output to the receiving RF SAW filter unit 420.

In this case, the low noise amplifier 410 amplifies an RF signal of an 800 MHz band input from the first duplexer 510 or an RF signal of a 300 MHz band input from the second duplexer 520.

In addition, the receiving side RF SAW filter unit 420 receives an RF signal of an 800 MHz band from the low noise amplifier 410, and receives a first receiving side RF SAW filter 421 passing only a desired band among the RF signals, and the low noise. When the RF signal of the 300MHz band is received from the amplifier 410, a second receiving side RF SAW filter 422 which passes only a desired band of the RF signals is connected in parallel between the fourth switch SW4 and the fifth switch SW5. It is.

Then, the down-mixer 430 receives an RF signal of 800 MHz or 300 MHz band from the first receiving side RF SAW filter 421 or the second receiving side RF SAW filter 422 and then the up / down reference frequency. Mixed with the reference frequency output from the generator 100 is converted to the IF signal.

In addition, when the receiving side IF SAW filter unit 440 receives an IF signal of 800 MHz band from the down-mixer 430, the first receiving side IF SAW filter 441 passes only a desired band among the IF signals, and When a 300 MHz band IF signal is input from the down-mixer 430, a second receiving side IF SAW filter 442 passing only a desired band among the IF signals is parallel between the sixth switch SW6 and the seventh switch SW7. Is connected.

In addition, the IFR 450 inputs an IF signal in an 800 MHz or 300 MHz band from a first receiving side IF SAW filter 441 or a second receiving side IF SAW filter 442 in the receiving IF SAW filter unit 440. It will be converted into digital voice data.

Further, the first to ninth switches SW1 to SW9 receive a terminal control signal or a pager control signal from the MSM 200 and simultaneously switch between the terminal and the wireless pager according to the control signal. Has

Therefore, when the reception is not possible in the weak field of the terminal through the CDMA terminal with the built-in wireless pager function as described above, it is switched to the path of the wireless pager and can be called by the wireless pager.

As described above, according to the transmitter / receiver having a wireless pager function in a CDMA terminal according to the present invention, by adding a wireless pager function to a mobile communication terminal, the mobile pager can make a call to a wireless pager in a weak field area of the terminal. Not only does the user need not have a separate pager and wireless pager, but it also saves money and enables users to receive calls with a wireless pager in a weak field where the terminal cannot be received. There is an outstanding effect that it can provide services.

Claims (6)

An up / down reference frequency generator for generating a reference frequency; MSM (Mobile) outputs the terminal control signal when the RF (Radio Frequency) signal received from the base station is an 800 MHz band RF signal, and outputs a pager control signal when the RF signal received from the base station is an RF signal of 300 MHz band. Station Manager); Intermediate Frequency Transmit (IFT), which receives digital voice / data signals from the MSM and converts them into IF (Intermediate Frequency) signals. Transmitting side IF SAW filter unit that passes only a desired band of IF signal and receives a radio pager control signal from the MSM and simultaneously receives a 300 MHz band IF signal from the IFT. An up-mixer that receives an IF signal from the side IF SAW filter unit and converts the RF signal into a RF signal by mixing with the reference frequency output from the up / down reference frequency generator, and receiving a terminal control signal from the MSM. When the up-mixer receives an RF signal in the 800 MHz band, it passes only the desired band of the RF signal. On the other hand, when the RF signal of the 300 MHz band is received by the up-mixer while receiving the pager control signal from the MSM, the transmitter RF SAW filter unit passes only the desired band of the RF signal, from the transmitter RF SAW filter unit. Power TR for receiving RF signal of 300MHz band and amplifying it by transmission power, and outputting it. Power amplifier for receiving RF signal of 800MHz band from the transmitting RF SAW filter unit and amplifying it for transmission power and then outputting the power amplifier. An RF transmitter comprising an isolator which bypasses the RF signal output from the receiver and prevents the receiver signal from flowing backward; A low noise amplifier receiving an RF signal transmitted from a base station and simultaneously amplifying the RF signal, and receiving a terminal control signal from the MSM and receiving an RF signal of an 800 MHz band from the low noise amplifier, only a desired band of the RF signal is received. A receiving side RF SAW filter unit which passes only a desired band of the RF signal when the RF signal of the 300 MHz band is received by the low noise amplifier while receiving a pager control signal from the MSM. A down-mixer that receives an RF signal from the down-mixer and mixes it with a reference frequency output from the up / down reference frequency generator and converts it into an IF signal, and receives a terminal control signal from the MSM and 800 MHz in the down-mixer As long as the IF signal of the band is received, only the desired band of the IF signal passes When receiving a pager control signal from the MSM and receiving a 300 MHz band IF signal from the down-mixer, the receiver IF SAW filter unit passes only a desired band of the IF signal, and the receiver IF SAW filter unit. An RF receiver comprising an IFR (Intermediate Frequency Receiver) for receiving an IF signal and converting the received digital signal into digital voice data; And CDMA characterized by comprising a duplexer for transmitting the RF signal of the 800MHz or 300MHz band output from the RF transmitter to the base station through the antenna, while passing the RF signal of the 800MHz or 300MHz band received through the antenna to the RF receiver Transmitter / receiver device with wireless pager function in terminal. The method of claim 1, The transmitting side IF SAW filter unit includes: a first transmitting side IF SAW filter which receives an IF signal in an 800 MHz band from the IFT and passes only a desired band of the IF signals; A second transmitting-side IF SAW filter which receives an IF signal in a 300 MHz band from the IFT and passes only a desired band among the IF signals; A first switch connecting the IFT and the first transmitting side IF SAW filter when receiving the terminal control signal from the MSM, and connecting the IFT and the second transmitting side IF SAW filter when receiving the radio pager control signal from the MSM; ; And When the terminal control signal is received from the MSM, the first transmitter-side IF SAW filter is connected to the up-mixer, and when the wireless pager control signal is input from the MSM, the second transmitter-side IF SAW filter is connected with the up-mixer. A transmitter / receiver having a radio pager function in a CDMA terminal, characterized in that it comprises a second switch. The method of claim 1, The transmitting side RF SAW filter unit may include: a first transmitting side RF SAW filter which receives an RF signal of an 800 MHz band from the up-mixer and passes only a desired band of the RF signals; A second transmitting side RF SAW filter which receives an RF signal of a 300 MHz band from the up-mixer and passes only a desired band of the RF signal; And When the terminal control signal is input from the MSM, the up-mixer is connected to the first transmitting RF SAW filter, while when the wireless pager control signal is input from the MSM, the up-mixer is connected with the second transmitting RF SAW filter. And a wireless pager function in a CDMA terminal, characterized in that it comprises a third switch. The method of claim 1, The receiving side RF SAW filter unit may include: a first receiving side RF SAW filter which receives an RF signal of an 800 MHz band from the low noise amplifier and passes only a desired band of the RF signals; A second receiving side RF SAW filter which receives an RF signal of 300 MHz band from the low noise amplifier and passes only a desired band of the RF signal; Connecting the low noise amplifier and the first receiving side RF SAW filter when receiving the terminal control signal from the MSM, and connecting the low noise amplifier and the second receiving side RF SAW filter when receiving the pager control signal from the MSM. 4 switch; And When the terminal control signal is received from the MSM, the first receiver side RF SAW filter is connected to the down-mixer, and when the wireless pager control signal is received from the MSM, the second receiver side SAW filter is connected with the down-mixer. A transmitter / receiver having a radio pager function in a CDMA terminal, characterized in that it comprises a fifth switch. The method of claim 1, The receiving side IF SAW filter unit may include: a first receiving side IF SAW filter configured to receive an 800 MHz band IF signal from the down-mixer and pass only a desired band of the IF signals; A second receiving side IF SAW filter which receives an IF signal of 300 MHz band from the down-mixer and passes only a desired band of the IF signals; When the terminal control signal is received from the MSM, the down-mixer is connected to the first receiving side IF SAW filter, and when the wireless pager control signal is received from the MSM, the down-mixer and the second receiving side RF SAW filter are connected. A sixth switch to make; And A seventh switch connecting the first receiving side IF SAW filter and the IFR when receiving the terminal control signal from the MSM, and connecting the second receiving side IF SAW filter and the IFR when receiving the wireless pager control signal from the MSM. A transmitter / receiver having a pager function in a CDA terminal, characterized in that consisting of. The method of claim 1, The duplexer unit passes the 800 MHz band RF signal received through the antenna to the low noise amplifier in the RF receiver, and transmits the 800 MHz band RF signal output from the power amplifier in the RF transmitter to the base station through the antenna. ; A second duplexer which passes an RF signal of a 300 MHz band received through an antenna to a low noise amplifier in the RF receiver and transmits an RF signal of a 300 MHz band output from the power TR in the RF transmitter to a base station through the antenna; An eighth switch connecting the antenna with the first duplexer when receiving a terminal control signal from the MSM, and connecting the antenna with the second duplexer when receiving a wireless pager control signal from the MSM; And And a ninth switch connecting the first duplexer and the low noise amplifier when the terminal control signal is input from the MSM, and connecting the second duplexer and the low noise amplifier when the wireless pager control signal is received from the MSM. A transmission / reception device having a radio pager function in a CDMA terminal.