KR200232445Y1 - Donor module of mobile communication system for in-building using frequence transfer method - Google Patents

Abstract

The present invention relates to a donor module of an in-building mobile communication relay system using a frequency conversion method that improves call quality by relaying smooth communication between a base station and a mobile station in a building, and solves a shadow area in a building at a low cost. Transmitter which down-converts the RF (PCS, IMT-2000) forward frequency (TX) received from the base station or various repeaters to the IF frequency (intermediate frequency), amplifies and outputs the signal of the IF frequency band received from the CATV cable 4-way combiner, receiving unit which inter-converts the reverse frequency (RX) of the IF band received from the 4-way combiner to RF frequency and interlocks with the base station or various repeaters, and all antenna modules input to the receiving unit. The antenna controller is a power controller (OOK modem) that senses the bite level and controls the power through the forward pilot tone. The module is remotely controlled and includes a microprocessor unit (-Processor Unit) that receives the alarm data received from each antenna module and sends an alarm signal to the base station or the mobile terminal.

Description

DONOR MODULE OF MOBILE COMMUNICATION SYSTEM 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 donor module of 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. Signals 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 (16 30), 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.

The operation of the donor module 1000 having the above 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.

On the other hand, the signal transmitted from the mobile phone 500 to the donor module 1000, the duplexer 1400 of the donor module 1000 receives the signal of the intermediate frequency band received from the RG cable 400 to receive the receiver 1600 and Output to tone detector and 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, and its purpose is to improve the call quality by relaying the smooth communication between the base station and the mobile station in the building, and to reduce the shadow area in the building at low cost. To provide a donor module of the in-building mobile communication relay system.

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

2 is a block diagram of a donor module of the present invention.

3 is an exemplary view in which an embodiment of the present invention is 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

A feature of the donor module of the in-building mobile communication relay system using the frequency conversion method according to the present invention for achieving the above object, the RF (PCS, IMT-2000) forward frequency (TX) received from the base station or various repeaters ) Down-converts to IF frequency (middle frequency), amplifies and outputs a 4-way coupler for receiving signals from the IF frequency band received from the CATV cable, and reverses the IF frequency band received from the 4-way combiner. The power control unit (OOK), which converts the frequency RX back to the RF frequency again, detects the bite level from all the antenna modules input to the base station or various repeaters, and controls the power through a forward pilot tone. Control the antenna module with a modem) and receive the alarm data received from each antenna module. To include a microcomputer (-Processor Unit) controller sends an alarm signal.

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.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention.

Figure 2 is a block diagram of a donor module of the present invention, Figure 3 is an exemplary view of applying an embodiment of the present invention in a building.

As shown, the donor module 3000 of the present invention 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). And a 4-way combiner 3200 that receives the signal of the IF frequency band received from the CATV cable, amplifies and outputs the amplified output 3100, and a reverse frequency RX of the IF frequency band received from the 4-way combiner. A power control unit (OOK modem) which up-converts to the RF frequency again to detect the Bite tone level from all the antenna modules inputted to the base station or various repeaters, and controls power through a forward pilot tone. And remote control the antenna module, and receives the alarm data received from each antenna module and transmits the alarm signal to the base station or the mobile terminal (-Processor Unit) control unit 3400 Include.

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 band pass filter 3308 for passing only the signals of a desired RF frequency band to the RF signal passed through the base 3307, and outputting the output signal passed through the band pass filter 3308 to the base station 200 or various repeaters. Link to 300.

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 is a power controller (OOK modem) for controlling power through a forward pilot tone. Remote control, and receives the alarm data received from each antenna module sends an alarm signal to the base station or mobile terminal.

In the above described and illustrated with respect to the preferred embodiment of the present invention, the present invention is not limited to the above-described embodiment, it is common in the field to which the present invention belongs without departing from the spirit of the present invention 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 donor module of 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 of having a 1: N type of connection is the power control method using the tone auto adjustment function and the data transmission format through the OOK modem, and by optimizing the continuous reverse cell radius, quality and call capacity, It improves the call quality by relaying the smooth communication between mobile stations in the building and has the effect of eliminating the shadow area in the building at low cost.

Claims (3)

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 same; 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. A donor module of an in-building mobile communication relay system using a frequency conversion method, comprising a microprocessor unit (3400) for sending an alarm signal to a base station or a mobile terminal. The method of claim 1, wherein the transmitter 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. -Donor module of mobile communication relay system for building. The method of claim 1, 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. The donor module of the in-building mobile communication relay system using the frequency conversion method, characterized in that the output signal passing through the bandpass filter (3308) to the base station 200 or a variety of repeaters (300).