KR20020071070A - System of mobile communication for in-building using frequence transfer method - Google Patents

Abstract

PURPOSE: A mobile communication relay system for in-building using a frequency modulation type is provided to improve speech quality and resolve a blanket area in a building at a low cost by relaying a smooth communication between a BTS(Base Transceiver Station) and an MS(Mobile Station). CONSTITUTION: A donor module(3000) down-converts a forward frequency received from a BTS(200) and various repeaters(300) into an IF(Intermediate Frequency) band to transmit the IF band to an antenna modules(6000) using a CATV cable, and up-converts a reverse frequency with the IF band received from the antenna module(600) into an RF(Radio Frequency) band to interwork to the BTS(200) or various repeaters(300). A transmitting unit(4000) provides +30V to a combiner for providing the power of the antenna module(6000), and transmits the converted IF and a bidirectional OOK(On-Off Keying) modem frequency to a cable. A diplexer unit(5000) receives the forward IF, the OOK modem signal, and the +30V DC power from the donor module(3000), provides the DC power to an RF unit, provides the forward IF to the RF unit, and provides the OOK modem signal to a receiving power control unit(OOK modem). A plurality of antenna modules(6000) up-convert the received IF into a service frequency to output the service frequency to a mobile phone in a call blanket area through a patch antenna or an omni-antenna, and down-convert the reverse RF received from a mobile terminal into the IF to output the IF together with the OOK modem signal to the donor module(3000).

Description

Mobile communication relay system for in-building using frequency conversion method {SYSTEM OF MOBILE COMMUNICATION FOR IN-BUILDING USING FREQUENCE TRANSFER METHOD}

The present invention relates to a mobile communication relay system for in-building, and more particularly, to a mobile communication service system for solving a communication shade area using a mobile repeater inside a building.

In general, a mobile communication service system includes a base station transceiver system and a base station controller.

The base station and the mobile station communicate in a constant frequency band, and each base station has a constant call radius. Therefore, by arranging a plurality of base stations appropriately so that the call radius of each base station overlaps each other, the area where the call is possible can be expanded.

However, even if the entire city is covered by the arrangement of such a plurality of base stations, a call shadow area is created in the underground space of a large building and the interior of a high-rise building where communication is not possible.

Due to the occurrence of the call shadow area, the mobile phone user may not receive smooth call service within the call shadow area.

In order to solve the problem of call shadow area generation, conventionally, a radio frequency repeater is installed in the shadow area to solve the shadow area, or converts a high frequency signal into an optical signal and emits light to the shadow area in the building. Antennas were also used.

However, there is a disadvantage in that it costs too much to install a repeater using the optical cable and the optical dispersion antenna. Therefore, we developed an in-building relay system using coaxial cable to solve these shortcomings, and solved the shadow area in the building.

1 is a diagram illustrating a donor module of a conventional in-building repeater. Hereinafter, a conventional repeater will be described taking a code division multiple access (CDMA) mobile communication system as an example.

1 is a configuration diagram of a donor module of a conventional in-building repeater system, which is a repeater for power control.

As shown, the donor module 1000 may amplify a signal of a high frequency band input through a microcomputer 1500 performing power control, a duplexer 1100 and a duplex 1100 for bidirectional communication with the base station 200. A low noise amplifier, a mixer 1220 that converts a signal of a high frequency band into a signal of an intermediate frequency band, and a surfaceacoustic wave (SAW) filter that performs filtering to obtain a signal of a desired intermediate frequency band from an output signal of the mixer 1220 ( 1230, a variable attenuator 1240 for power control of the output signal of the surface acoustic wave filter 1230 by an external control signal, a power amplifier 1250 for power amplifying the output signal of the variable attenuator 1240, and frequency shift modulation. The signal of the FSK modulator 1900 for outputting the signal, the variable attenuator 1310 for controlling the power according to the control signal of the microcomputer, the amplifier 1320 for amplifying the signal of the variable attenuator 1310, and the amplifier 1320 The low pass filter 1330 for low pass, the adder 1340 for adding up the signal of the power amplifier 1250 and the signal of the power amplifier 1250 and outputting the output signal of the adder 1340 to the RG cable 400. A duplexer 1400 which receives a signal of an intermediate frequency band received from the RG cable 400, detects a tone in the signal of the intermediate frequency band received by the duplexer 1400, and performs FSK demodulation to the microcomputer 1500. A low noise amplifier for amplifying the output signals of the surface acoustic wave filter 1610 and the surface acoustic wave filter 1610 which pass only a desired band in the signal of the intermediate frequency band received by the tone detector and the FSK demodulator 1700 and the duplexer 1400. 1620, the mixer 1690 that provides a state control signal to the output signal of the low noise amplifier 1620 under the control of the microcomputer 1500, and performs power control of the output signal of the mixer 1690 under the control of the microcomputer 1500. Variable attenuator (163) 0), a mixer 1640 for modulating the signal of the variable attenuator 1630 into a signal of a high frequency band, a surface acoustic wave filter 1650 and a surface acoustic wave filter 1650 for passing only signals of a desired high frequency band at the output of the mixer 1640. A power amplifier 1680 for power amplifying the output signal of the output to the duplexer 1100.

2 is a configuration diagram of a conventional remote module 2000, which describes only one of a plurality of remote modules, and the configuration and operation of the remaining remote modules 2100 to 2900 are the same. Up to 60 such remote modules can be connected as needed.

As shown, the remote module 2000 is a signal of the intermediate frequency band input through the microcomputer 1060 performing power control, the duplexer 2040 and the duplex 2040 for bidirectional communication with the donor module 1000. Output signals of the surface acoustic wave filter (2011) and the surface acoustic wave filter (2011) that pass only signals in the intermediate frequency band in accordance with the control signal of the microcomputer, and output signals of the variable attenuator (2012) and the variable attenuator (2012). A surface acoustic wave filter which performs filtering to obtain a desired high frequency band signal from an output signal of the amplifier 2013, an amplifier to amplify, a mixer 2014 that converts an output signal of the amplifier 2013 into a signal of a high frequency band ( 2015), the power amplifier 2016 for power amplifying the output signal of the surface acoustic wave filter 2015, the low pass filter 2021 and low pass filter 2021 for low-passing the received signal of the duplexer 2040 The drop detects the level in the output signal of the amplifier 2022 and the amplifier 2022, and outputs the output signal of the level detector, the FSK demodulator 2023, and the power amplifier 2016 that the frequency shift demodulates and delivers to the microcomputer 2060. The low noise amplifier 2037 which transmits to the user's mobile phone 500 through the antenna 2051 and amplifies the signal received by the duplexer 2050 and the duplexer 2050. The mixer 2036 converts the output signal of the low noise amplifier 2037 into a signal of the intermediate frequency band, the surface acoustic wave filter 2035 and the surface acoustic wave filter 20 that pass only signals of the desired frequency band from the output signal of the mixer 2036 ( A mixer 2033 for FSK-modulating the state control signal on the output signal of the 2035, a variable attenuator 2032, and a variable attenuator 2032 for controlling power according to the control of the microcomputer 1500 on the output signal of the mixer 2033. Before output signal The amplified and a power amplifier 2031 to output to the duplexer 2040.

The operation of the donor module 1000 and the remote module 2000 having such a configuration will be described in detail as follows.

First, a signal of a high frequency band, that is, 1.8 to 1.9 MHz band, is received by the duplexer 1100 from the base station 200 by wire or wirelessly.

The signal of the high frequency band input through the duplex 1100 is amplified by the low noise amplifier 1210 and then converted into a signal of the intermediate frequency band by the mixer 1220.

Next, only the signals of the intermediate frequency band are passed through the surface acoustic wave filter 1230, and the remaining bands are filtered out.

Then, the microcomputer 1500 outputs power by controlling the output signal of the surface acoustic wave filter 1230 through the variable attenuator 1240.

Next, the output signal of the variable attenuator 1240 is amplified in the power amplifier 1250 and output to the adder 1340.

Meanwhile, the FSK modulator 1900 outputs a frequency shift modulated signal. In this case, when interworking with the base station 200, a signal of a 10 MHz oscillator may be directly applied.

Then, the variable attenuator 1310 controls and outputs a power to a frequency shift modulated signal according to the control signal of the microcomputer 1500, and this signal is amplified by the amplifier 1320 and then the low pass portion of the low pass filter 1330. Only output to adder 1340. In this case, the signal output from the low pass filter 1330 is generated at a predetermined level for power control.

Next, the adder 1340 may add the signal of the low pass filter 1330 and the signal of the power amplifier 1250 and output the sum signal to the duplexer 1400.

The duplexer 1400 then transmits this signal to the remote module 2000 in the building via the RG cable 400. At this time, the RG cable 400 may be replaced with a coaxial line or a CATV network cable as necessary.

The intermediate frequency signal transmitted through the RG cable 400 is received by the duplexer 2040 of the remote module 2000.

Next, the signal of the intermediate frequency band input through the duplex 2040 passes only the signal of the intermediate frequency band in the surface acoustic wave filter 20110.

On the other hand, the received signal of the duplexer 2040 is low pass through the low pass filter 2021, amplified by the amplifier 2022, and then the frequency shift is demodulated by the level detector and the FSK demodulator 2023 to detect the reception level. And is transferred to the microcomputer 2060.

Then, the microcomputer 2060 determines how much the reception level is reduced and performs power control.

Then, the variable attenuator 2012 performs power control to compensate for the reduced portion of the output signal of the surface acoustic wave filter 2011 according to the control signal of the microcomputer 2060.

Next, the output signal of the variable attenuator 2012 is amplified by the amplifier 2013 and then converted by the mixer 2014 into a signal of a high frequency band.

Next, the surface acoustic wave filter 2015 performs filtering to obtain a signal of a desired high frequency band from the output signal of the mixer 2014.

Thereafter, the power amplifier 2016 outputs the output signal of the surface acoustic wave filter 2015 to the duplexer 2050 for power amplification.

Then, the duplexer 2050 transmits the output signal of the power amplifier 2016 to the mobile telephone 500 of the user through the antenna 2051. Thus, the shaded area in the building is eliminated.

Meanwhile, the signal transmitted from the mobile telephone 500 is received by the duplexer 2050 through the antenna 2051, amplified by the low noise amplifier 2037, and then converted into a signal of the intermediate frequency band by the mixer 2036.

Then, the surface acoustic wave filter 2035 allows only the signal of the intermediate frequency band to pass through the output signal of the mixer 2036.

Next, the mixer 2033 outputs the state control signal by FSK modulation on the output signal of the surface acoustic wave filter 2035 under the control of the microcomputer 2060.

Then, the variable attenuator 2032 controls the power according to the control of the microcomputer 1500 to the output signal of the mixer 2033.

The output signal of the power controlled variable attenuator 2032 is amplified by the power amplifier 2031 and output to the duplexer 2040.

The duplexer 2040 then transmits the output signal of the power amplifier 20310 to the donor module 1000 via the RG cable 400.

Then, the duplexer 1400 of the donor module 1000 receives signals of the intermediate frequency band received from the RG cable 400 and outputs them to the receiver 1600, the tone detector, and the FSK demodulator 1700.

Then, the tone detector and the FSK demodulator 1700 detects the tone in the signal of the intermediate frequency band received by the duplexer 1400, performs FSK demodulation, and transmits the tone to the microcomputer 1500.

Meanwhile, the surface acoustic wave filter 1610 of the receiver 1600 passes only the desired intermediate frequency band from the signal of the intermediate frequency band received by the duplexer 1400, and the low noise amplifier 1620 receives the output signal of the surface acoustic wave filter 1610. Amplify.

Then, the mixer 1690 loads the state control signal to the output signal of the low noise amplifier 1620 under the control of the microcomputer 1500.

Next, the variable attenuator 1630 outputs the output signal of the mixer 1690 by power control according to the control of the microcomputer 1500, and at this time, the microcomputer 1500 controls the state detected by the tone detector and the FSK demodulator 1700. Power control is performed according to the tone signal.

Then, the mixer 1640 modulates the signal of the variable attenuator 1630 into a signal of a high frequency band, and the surface acoustic wave filter 1650 passes only a signal of a desired high frequency band at the output of the mixer 1640.

The high frequency signal thus output is amplified by the power amplifier 1680 and transmitted to the base station 200 through the duplexer 1100 by wire or wirelessly.

The shadow area is eliminated by connecting the mobile phone 500 and the base station 200 by this process.

However, such a conventional repeater system requires manual adjustment of the reverse output setting when installing and expanding multiple remote modules and relocating them. The common problem of all repeaters of a 1: N type connection is a simple tone system and an FSK modem. FSK modem method that transmits (vibration) data by frequency shifting the center tone frequency by manually adjusting power control method using data transmission format through By using this method, the repeater for IMT-2000, which requires a large amount of data and a sophisticated bit error rate (BER), does not have a number of technical supplements.

Accordingly, the present invention is to solve the above-mentioned conventional problems, its purpose is to improve the call quality by relaying the smooth communication between the base station and the mobile station in the building, the frequency conversion method to solve the shadow area in the building at a low cost It is to provide a mobile communication relay system for in-building using.

1 is a donor module configuration of a conventional in-building repeater system.

2 is a diagram illustrating an antenna module of a conventional in-building repeater system.

3 is a block diagram of a mobile communication service system according to a first embodiment of the present invention.

4 is a diagram illustrating a power control state of a mobile communication service system according to a second embodiment of the present invention.

5 is a configuration diagram of the donor module of the present invention.

6 is a configuration diagram of an antenna module of the present invention.

7 is an exemplary view in which the first and second embodiments of the present invention are applied to a building.

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

200: base station 300: repeater

3000: donor module 3100: transmitter

3200: 4-way combiner 3300: receiver

3400: microcomputer control unit 4000: transmission unit

5000: diplexer 6000: antenna module

6100: diplexer 6200: transmitter

6300: power control unit (OOK modem) 6400: receiving unit

6500: DIP Switch 6600: Duplexer

6700: Micom control unit

Features of the in-building mobile communication relay system using the frequency conversion method according to the present invention for achieving the above object, the base station for transmitting and receiving a predetermined service frequency signal (PCS or IMT-2000); Down-convert the forward frequency (TX) received from the base station or various repeaters to the IF frequency and transmit it to the antenna module using a CATV cable, and the reverse frequency (RX) of the IF frequency band received from the antenna module is increased again to the RF frequency. A donor module that converts and interworks with the base station or various repeaters; A transmitter for applying + 30V to the combiner to apply power to the antenna module and transmitting the converted IF frequency and the bidirectional OOK modem frequency together by cables; Receives the forward IF frequency and the OOK modem signal and + 30V DC power from the donor module, and the DC power is separated into the power supply of the antenna module and supplies power to the RF and P respectively, and the forward IF frequency is the RF to the OOK modem. The signal is divided into a receiving power control unit (OOK modem) applied to the diplexer; The received forward IF frequency is converted up to a service frequency and outputted to a mobile phone in a shadow area of a call through a patch antenna or an omni antenna, and the reverse RF frequency received from the mobile terminal is down-converted to an IF frequency so that It includes a plurality of antenna modules to output to the donor module together.

The donor module down-converts the RF (PCS, IMT-2000) forward frequency (TX) received from the base station or various repeaters to an IF frequency (intermediate frequency), and amplifies and outputs the received signal from the CATV cable. 4-way combiner receiving a signal of the IF frequency band to be received, the receiver reversely converts the reverse frequency (RX) of the IF frequency band received from the 4-way combiner to the RF frequency again to the base station or various relays, input to the receiver The antenna module is remotely controlled by a power controller (OOK modem) which senses the bite level from all antenna modules, and controls the power through the forward pilot tone, and receives the alarm data received from each antenna module. It includes a microprocessor (-Processor Unit) control unit that sends an alarm signal to the system.

The transmitter may include a low noise amplifier for amplifying an RF (PCS, IMT-2000) forward frequency (TX) signal received from the base station (BTS) or various repeaters, and a forward RF signal passing through the low noise amplifier. A first variable attenuator for controlling gain by a microcomputer control signal, a mixer for converting an output signal of the first variable attenuator to an IF frequency (intermediate frequency) signal, and to obtain a signal having a desired IF frequency band from the output signal of the mixer An LC bandpass filter for performing filtering, a power amplifier for amplifying the IF signal passing through the LC bandpass filter, a second signal detecting the IF signal level passing through the power amplifier and controlling gain by an external micom control signal A variable attenuator, a power amplifier for power amplifying the output signal of the second variable attenuator, a level for turning on / off the center tone frequency to a power controller (OOK modem) A detector, a third variable attenuator for controlling power according to a control message of the power controller, and a power amplifier for amplifying the output signal of the third variable attenuator and transmitting the output as a reference signal to the 4-way combiner. .

The receiver includes: a low noise amplifier for amplifying a reverse IF frequency (RX) signal received by the 4-way combiner, and an LC bandpass filter for passing only a signal in a desired IF frequency band through an IF frequency passing through the low noise amplifier. A power controller (OOK modem) that senses the bite level from all antenna modules passing through the LC bandpass filter and controls power through a forward pilot tone, and a power amplifier that amplifies the IF signal passing through the LC bandpass filter And a fourth variable attenuator for controlling power according to a control message of the power controller and the output signal of the fourth variable attenuator to an RF frequency (PCS, IMT-2000) signal. Bandpass fill that passes only the signals of the desired RF frequency band through the RF signal passing through the mixer, the power amplifier that amplifies the output signal of the mixer, and the power amplifier An output signal passed through the band-pass filter, and including the communication with the base station or the various repeater.

Each of the plurality of antenna modules includes a diplexer for bidirectional communication with the donor module, and a forward IF frequency (TX) input through the diplexer is up-converted to an RF frequency (PCS, IMT-2000) signal. A transmission unit connected to a patch antenna or an omni antenna and radiated, a power control unit (OOK modem) separated and applied to a reception power control unit (OOK modem) through the diplexer, and transmitting a signal of the transmission unit to an external shaded area; A duplexer receives an RF frequency (PCS, IMT-2000) signal transmitted from an external mobile terminal, and converts a reverse RF frequency (PCS, IMT-2000) signal received by the duplexer into an IF frequency signal to convert a OOK modem signal. Even though the receiver, several or dozens of antenna modules, which are transmitted to the diplexer, are installed, the monitoring unit of the donor can remotely monitor and control each antenna module. DIP switch to give a unique ID to each antenna module, the signal level of each antenna module, and detects the signal level of each antenna module and transmits the detected information to the donor module through the power control (OOK modem) (-Processor Unit) It includes a control unit.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

3 is a configuration diagram of a mobile communication service system according to a first embodiment of the present invention, and FIG. 4 is a diagram illustrating a power control state of a mobile communication service system according to a second embodiment of the present invention.

As shown, the present invention is broadly divided into a base station 200, a donor module 3000, a diplexer unit 5000, and a plurality of antenna modules 6000.

The base station 200 transmits and receives a predetermined service frequency signal (PCS or IMT-2000), and the donor module 3000 converts the forward frequency TX received from the base station 2000 or the various repeaters 300 according to the IF frequency. Down-convert and transmit the CATV cable to the antenna module 6000, and up-converts the reverse frequency (RX) of the IF frequency band received from the antenna module 6000 back to the RF frequency to the base station 2000 or various repeaters Interlock

The diplexer 5000 includes a transmitter 4000 for applying + 30V to the combiner to apply power to the antenna module 6000 and transmitting the converted IF frequency and the bidirectional OOK modem frequency together by cables; Receiving a forward IF frequency, a OOK modem signal, and + 30V DC power from the donor module 3000, the DC power is separated into a power supply of the antenna module 3000, and supplies power to the RF and P, respectively, and a forward IF frequency. Is an RF unit, and the OOK modem signal is separated and applied to a reception power control unit (OOK modem).

The plurality of antenna modules 6000 up-converts the received forward IF frequency to a service frequency and outputs it to a mobile phone in a call shadow area through a patch antenna or an omni antenna, and a reverse RF frequency received from the mobile terminal is an IF frequency. It is down-converted to and outputs the donor module 3000 together with the OOK modem signal.

FIG. 5 is a schematic diagram of a donor module. As shown, the donor module 3000 of the present invention may include RF (PCS, IMT-2000) forward frequency (TX) received from the base station 200 or the various repeaters 300. Down-converts to the IF frequency (intermediate frequency), amplifies and outputs the transmitter 3100, a 4-way combiner 3200 receiving a signal from the IF frequency band received from the CATV cable, received from the 4-way combiner The frequency converter reverses the reverse frequency (RX) to the RF frequency band again, and receives the Bite tone level from all the antenna modules input to the receiving unit 3300 and the interworking base station or various repeaters. The antenna is remotely controlled by a power control unit (OOK modem) that controls power, and receives alarm data received from each antenna module and sends an alarm signal to a base station or a mobile terminal. It includes a microprocessor (-Processor Unit) control unit 3400.

The transmitter 3100 may include a low noise amplifier 3301 for amplifying an RF (PCS, IMT-2000) forward frequency (TX) signal received from the base station (BTS) 200 or the various repeaters 300; An output frequency of the first variable attenuator 3102 and the first variable attenuator 3102 for controlling a gain of the forward RF signal passing through the low noise amplifier 3301 by an external micom control signal is converted into an IF frequency (intermediate frequency). Pass through the mixer 3103, the LC bandpass filter 3104, and the LC bandpass filter 3104 which perform filtering to obtain a signal having a desired IF frequency band from the output signal of the mixer 3103. A power amplifier 3105 for amplifying an IF signal, a second variable attenuator 3106 for detecting an IF signal level passing through the power amplifier 3105, and controlling a gain by an external microcomputer control signal; Power to amplify the output signal of the attenuator 3106 A level detector 3108 for turning on / off a center tone frequency to the aeration 3107, a power control unit (OOK modem) 3111, and a third variable attenuator for controlling power according to a control message of the power control unit 3111. And a power amplifier 3110 for power amplifying the output signal of the third variable attenuator 3111 and transmitting the output of the third variable attenuator 3111 to the 4-way combiner 3200 as a reference signal.

In addition, the receiver 3300 includes a low noise amplifier 3301 for amplifying a reverse IF frequency (RX) signal received by the 4-way combiner 3200 and an IF frequency passed through the low noise amplifier 3301. Controls power through the forward pilot tone by detecting the Bite tone levels from all the antenna modules 6000 passing through the LC bandpass filter 3302 and the LC bandpass filter 3302 that pass only signals in the desired IF frequency band. A power control unit (OOK modem) 3303, a power amplifier 3304 for amplifying the IF signal passed through the LC bandpass filter 3302, and an IF signal level passing through the power amplifier 3304; A fourth variable attenuator 3305 for controlling power according to a control message of the 3303, a mixer 3306 for modulating an output signal of the fourth variable attenuator 3305 to an RF frequency (PCS, IMT-2000) signal, and a mixer A power amplifier 3307 for power amplifying the output signal of the 3306, power amplification And a bandpass filter 3308 for passing only the RF signal of the desired RF frequency band through the RF signal 3307, and outputting the output signal passed through the bandpass filter 3308 to the base station 200 or various repeaters. Link to 300.

FIG. 6 is a configuration diagram of an antenna module. As illustrated, each of the plurality of antenna modules 6000 of the present invention may include a diplexer 6100 for bidirectional communication with the donor module 3000, and The forward IF frequency TX input through the diplexer 6100 is up-converted into an RF frequency (PCS, IMT-2000) signal, and is connected to a patch antenna or an omni antenna, and is radiated by the transmitter 6200. The power control unit (OOK modem) 6300, which is separately applied to the receiving OOK modem through the lexer 6100, transmits a signal of the transmitter 6200 to an external shadow area, and transmits an RF frequency (PCS) transmitted from an external mobile terminal. , The duplexer 6600 receiving the IMT-2000 signal, and down-converting the reverse RF frequency (PCS, IMT-2000) signal received by the duplexer 6600 into an IF frequency signal and diplexing the OOK modem signal together with the OOK modem signal. 6100, receiving unit 6400, several humps Even if dozens of antenna modules 6000 are installed, the DIP switch 6500 which assigns a unique ID to each antenna module 6000 so that the monitoring unit of the donor can remotely monitor and control each antenna module. And a microprocessor unit controller 6700 for detecting a signal level of the antenna module 6000 and transmitting the detected information to the donor module 3000 through the power controller 6500.

7 is an exemplary view in which the first and second embodiments of the present invention are applied to a building.

Referring to the operation of the present invention configured in this way in more detail as follows.

First, when the base station 200 transmits a predetermined service frequency signal (PCS or IMT-2000), the donor module 3000 IFs the forward frequency TX received from the base station 2000 or the various repeaters 300 to IF. Down-converting to frequency and transmitting the CATV cable to the antenna module 6000, and up-converting the reverse frequency (RX) of the IF frequency band received from the antenna module 6000 back to the RF frequency to the base station 2000 or various Link to the repeater.

In more detail, the transmitter 3100 of the donor module 3000 converts the RF (PCS, IMT-2000) forward frequency TX received from the base station 200 or the various repeaters 300 into an IF frequency (middle). Down-converted, amplified, and outputted, the 4-way combiner 3200 receives a signal of an IF frequency band received from the CATV cable.

That is, the transmitter 3100 amplifies an RF (PCS, IMT-2000) forward frequency (TX) signal received from the base station (BTS) 200 or the various repeaters 300 in the low noise amplifier 3301. The first variable attenuator 3102 controls the gain of the forward RF signal passing through the low noise amplifier 3301 by an external micom control signal, and the mixer 3103 controls the gain of the first variable attenuator 3102. Convert the output signal to an IF frequency (middle frequency) signal. In addition, the LC bandpass filter 3104 performs filtering to obtain a signal of a desired IF frequency band from the output signal of the mixer 3103, and the power amplifier 3105 passes through the LC bandpass filter 3104. Amplifying the IF signal, the second variable attenuator 3106 detects the IF signal level passing through the power amplifier 3105 and controls gain by an external microcomputer control signal. In addition, the power amplifier 3107 power amplifies the output signal of the second variable attenuator 3106, and the level detector 3108 transmits the center tone frequency ON / OFF to the power control unit (OOK modem) 3111. The third variable attenuator 3109 controls power according to the control message of the power control unit 3111. In addition, the power amplifier 3110 power amplifies the output signal of the third variable attenuator 3111 and transmits the output to the 4-way combiner 3200 as a reference signal.

Thereafter, the receiver 3300 up-converts the reverse frequency RX of the IF frequency band received from the 4-way combiner 3200 back to the RF frequency and interworks with the base station or various repeaters.

That is, the receiver 3300 amplifies a reverse IF frequency (RX) signal received from the low noise amplifier 3301 to the 4-way combiner 3200, and the LC bandpass filter 3302 is the low noise. The IF frequency passed through the amplifier 3301 passes only the signal of the desired IF frequency band, and the power control unit (OOK modem) 3303 is a Bite tone from all the antenna modules 6000 passed through the LC bandpass filter 3302. It senses the level and controls the power through the forward pilot tone. In addition, the power amplifier 3304 amplifies the IF signal passed through the LC bandpass filter 3302, and the fourth variable attenuator 3305 uses the power control unit to determine the IF signal level passed through the power amplifier 3304. After controlling the power according to the control message of 3303, the mixer 3306 modulates the output signal of the fourth variable attenuator 3305 into an RF frequency (PCS, IMT-2000) signal. In addition, the power amplifier 3307 power-amplifies the output signal of the mixer 3306, and the bandpass filter 3308 passes only the signals of the desired RF frequency band through the RF signal passing through the power amplifier 3307, thereby providing the band. The output signal passing through the pass filter 3308 is linked to the base station 200 or the various repeaters 300.

In this case, the microprocessor controller 3400 detects the bit tone levels from all the antenna modules input to the receiver 3300 and controls the power through a forward pilot tone to the antenna module as a power controller (OOK modem). Remote control, and receives the alarm data received from each antenna module sends an alarm signal to the base station or mobile terminal.

Meanwhile, the transmitter 4000 applies + 30V to the combiner to apply the power of the antenna module 6000, transmits the converted IF frequency and the bidirectional OOK modem frequency together by a cable, and the diplexer unit 5000. Receives the forward IF frequency and the OOK modem signal, + 30V DC power from the donor module 3000, the DC power is separated into the power supply unit of the antenna module 3000 to apply power to the RF unit and P, respectively, and forward IF The frequency is applied to the RF unit and the OOK modem signal is separated and received by a reception power control unit (OOK modem).

Subsequently, the plurality of antenna modules 6000 up-converts the received forward IF frequency to a service frequency and outputs it to a mobile phone in a call shadow area through a patch antenna or an omni antenna, and the reverse RF frequency received from the mobile terminal is Downconverted to an IF frequency and output to the donor module 3000 together with a OOK modem signal.

Here, each of the plurality of antenna modules 6000, the diplexer 6100 allows bidirectional communication with the donor module 3000, and the transmitter 6200 is input through the diplexer 6100. The forward IF frequency TX is up-converted into an RF frequency (PCS, IMT-2000) signal and radiated in connection with a patch antenna or an omni antenna.

The power control unit (OOK modem) 6300 is separately applied to the receiving power control unit (OOK modem) through the diplexer 6100, and the duplexer 6600 transmits the signal of the transmitter 6200 to an external shaded area. And receives an RF frequency (PCS, IMT-2000) signal transmitted from an external mobile terminal.

In addition, the receiver 6400 down-converts the reverse RF frequency (PCS, IMT-2000) signal received by the duplexer 6600 to an IF frequency signal and transmits the OOK modem signal to the diplexer 6100. In this case, the DIP switch 6500 may assign a unique ID to each antenna module 6000 so that the monitoring unit of the donor can remotely monitor and control each antenna module even if several or tens of antenna modules 6000 are installed. To give it.

In the above, the microprocessor unit controller 6700 detects the signal level of each antenna module 6000 and transmits the detected information to the donor module 3000 through the power controller 6500. do.

Although the above has been illustrated and described with respect to the preferred embodiments of the present invention, the present invention is not limited to the above-described embodiments, and the present invention may be used in the art to which the present invention pertains without departing from the spirit of the invention as claimed in the claims. Various modifications can be made by those skilled in the art, and such modifications are intended to fall within the scope of the appended claims.

As described above, according to the in-building mobile communication relay system using the frequency conversion method according to the present invention, there is no need to manually adjust the reverse output setting when installing and expanding and relocating a plurality of remote modules. The problem with N-type connection is the power control method using tone auto-adjustment function and data transmission format through OOK modem, optimizing continuous reverse cell radius, quality and call capacity. It can improve the call quality by relaying smooth communication between each other, and reduce shadow area in the building at low cost.

Claims (5)

A base station 200 for transmitting and receiving a predetermined service frequency signal (PCS or IMT-2000); Forward frequency TX received from the base station 2000 or the various repeaters 300 is down-converted to the IF frequency and transmitted to the antenna module 6000 using the CATV cable, and the IF frequency band received from the antenna module 6000. A donor module 3000 which upconverts the reverse frequency RX of the RF frequency back to the RF frequency and interworks with the base station 2000 or various repeaters; A transmitter 4000 applying + 30V to the combiner to apply power to the antenna module 6000 and transmitting the converted IF frequency and the bidirectional OOK modem frequency together by cables; Receiving a forward IF frequency, a OOK modem signal, and + 30V DC power from the donor module 3000, the DC power is separated into a power supply of the antenna module 3000, and supplies power to the RF and P, respectively, and a forward IF frequency. Is a RF unit, and a OOK modem signal is separated and applied to a receiving power control unit (OOK modem); The received forward IF frequency is converted up to a service frequency and outputted to a mobile phone in a shadow area of a call through a patch antenna or an omni antenna, and the reverse RF frequency received from the mobile terminal is down-converted to an IF frequency so as to be converted into a OOK modem signal. In-building mobile communication relay system using a frequency conversion method characterized in that it comprises a plurality of antenna modules (6000) output to the donor module (3000) together. According to claim 1, wherein the donor module 3000 is A transmitter 3100 which down-converts the RF (PCS, IMT-2000) forward frequency TX received from the base station 200 or the various repeaters 300 to the IF frequency (intermediate frequency), amplifies and outputs the result; 4-way combiner (3200) for receiving the signal of the IF frequency band received from the CATV cable, A receiver 3300 which up-converts the reverse frequency RX received from the 4-way combiner to the RF frequency again and interworks with a base station or various repeaters; The antenna module is remotely controlled by a power controller (OOK modem) which senses the bite tone levels from all antenna modules input to the receiver and controls power through a forward pilot tone, and receives alarm data received from each antenna module. In-building mobile communication relay system using a frequency conversion method characterized in that it comprises a microprocessor (-Processor Unit) control unit for sending an alarm signal to a base station or a mobile terminal. The method of claim 2, wherein the transmitting unit 3100, A low noise amplifier 3301 that amplifies an RF (PCS, IMT-2000) forward frequency (TX) signal received from the base station (BTS) 200 or the various repeaters 300; A first variable attenuator 3102 for controlling the gain of the forward RF signal passing through the low noise amplifier 3301 by an external micom control signal; A mixer 3103 for converting the output signal of the first variable attenuator 3102 into an IF frequency (intermediate frequency) signal, LC bandpass filter 3104 for filtering to obtain a signal of a desired IF frequency band from the output signal of the mixer 3103, A power amplifier 3105 for amplifying the IF signal passing through the LC bandpass filter 3104, A second variable attenuator 3106 which detects the IF signal level passing through the power amplifier 3105 and controls gain by an external micom control signal; A power amplifier 3107 for power amplifying the output signal of the second variable attenuator 3106, A level detector 3108 that transmits ON / OFF of the center tone frequency to the power control unit (OOK modem) 3111, A third variable attenuator 3109 for controlling power according to a control message of the power controller 3111, A power amplifier 3110 which amplifies the output signal of the third variable attenuator 3111 and transmits the output to the 4-way combiner 3200 as a reference signal. -Mobile communication relay system for building. The method of claim 2, wherein the receiver 3300, A low noise amplifier 3301 for amplifying a reverse IF frequency (RX) signal received by the 4-way combiner 3200, LC bandpass filter 3302, which passes only the IF frequency band signal of the IF frequency passed through the low noise amplifier 3301, A power control unit (OOK modem) 3303 which senses the Bite tone levels from all the antenna modules 6000 that have passed through the LC bandpass filter 3302 and controls the power through a forward pilot tone, A power amplifier 3304 for amplifying the IF signal passing through the LC bandpass filter 3302, A fourth variable attenuator 3305 for controlling the power of the IF signal level passing through the power amplifier 3304 according to a control message of the power control unit 3303, A mixer 3306 for modulating an output signal of the fourth variable attenuator 3305 into an RF frequency (PCS, IMT-2000) signal, A power amplifier 3307 for power amplifying the output signal of the mixer 3306, And a bandpass filter 3308 that passes only the RF signal passed through the power amplifier 3307 to a signal in a desired RF frequency band. In-building mobile communication relay system using a frequency conversion method characterized in that the output signal passed through the bandpass filter (3308) to the base station (200) or a variety of repeaters (300). The method of claim 1, wherein each of the plurality of antenna modules 6000, A diplexer 6100 for bidirectional communication with the donor module 3000, The forward IF frequency TX input through the diplexer 6100 is up-converted into an RF frequency (PCS, IMT-2000) signal, and is connected to a patch antenna or an omni antenna to transmit a radiator 6200. A power control unit (OOK modem) 6300, which is separately applied to the reception power control unit (OOK modem) through the diplexer 6100, A duplexer 6600 which transmits a signal of the transmitter 6200 to an external shaded area and receives an RF frequency (PCS, IMT-2000) signal transmitted from an external mobile terminal; A receiver 6400 which down-converts a reverse RF frequency (PCS, IMT-2000) signal received by the duplexer 6600 to an IF frequency signal and transmits the OOK modem signal to the diplexer 6100 together; DIP switch 6500 which gives a unique ID to each antenna module 6000 so that the monitoring unit of the donor can remotely monitor and control each antenna module even if several or tens of antenna modules 6000 are installed. And a microprocessor unit controller 6700 that detects the signal level of each antenna module 6000 and transmits the detected information to the donor module 3000 through a power control unit 6500. In-building mobile communication relay system using a frequency conversion method characterized in that.