KR100811220B1 - Frequency band convertable relay - Google Patents

Abstract

A repeater for frequency band conversion is provided to solve the problem of call congestion and avoid frequency interference by converting the whole or part of a service frequency band into a surplus frequency band among many other service frequency bands, relaying the converted frequency band, and converting it into the original frequency band again. In a mobile communication network which consists of a base station, a link repeater(20), and a plurality of shadow area repeaters, the link repeater(20) comprises the first diplexer(202), a downlink LNA(Low Noise Amplifier)(203), a downlink converter(204), a downlink BPF(Band Pass Filter)(205) and a downlink HPA(High Power Filter)(206). The first diplexer(202) separates downlink signals of a service frequency band of the base station from uplink signals of the service frequency band. The downlink LNA(203) amplifies the downlink signals. The downlink converter(204) converts the service frequency band into another frequency band by combining the amplified downlink signals with local oscillation signals. The downlink BPS(205) passes only downlink signals of a desired converted frequency band among the converted signals. The downlink HPA(206) amplifies the converted downlink signals outputted through the downlink BPS(205).

Description

Frequency Band Convertable Relay {Frequency Band Convertable Relay}

1 is a schematic diagram showing the configuration of a base station and relay apparatus for mobile communication according to the present invention;

FIG. 2 is a block diagram showing a detailed configuration of the frequency conversion relay apparatus for link shown in FIG. 1;

3 is a block diagram showing a detailed configuration of the shadow area frequency conversion relay shown in FIG.

4 is a block diagram showing the detailed configuration of another example of the frequency conversion relay device for link shown in FIG.

5 is a block diagram showing the detailed configuration of another example of the shadow area frequency conversion relay shown in FIG.

* Explanation of symbols for main parts of the drawings

10: base station transceiver 20: link relay

30: shadow area relay device 40: terminal

201: antenna for base station 202, 207: diplexer

203,208: low noise amplifier 204,209: mixer

205,210: Bandpass filter 206,211: High power amplifier

212: coupling / divider 213-1 to 213-N: link antenna

220: fault detector 230: mobile phone unit

410,510: digital noise canceller

The present invention is an improvement of the patent application No. 10-2005-0038723 frequency conversion relay device previously filed by the present applicant, more specifically, a wireless mobile communication service (cellular, PCS, IMT 2000, WCDMA, Wibro; The present invention relates to a frequency band conversion relay apparatus which converts all or part of a frequency band serviced by a base station into an unserviced excess frequency band set by an operator and transmits the same.

In recent years, as subscribers of mobile subscription wireless phones and personal mobile phones (PCS) have increased rapidly, the needs of subscribers requiring better call quality have increased, and in order to satisfy the needs of these subscribers, shaded areas with poor call quality have been developed. Many relays are installed to solve this problem. That is, the mobile communication system is composed of a base station controller, a plurality of base stations, etc. The base station partitions the entire service area in units of cells, and is distributed to each cell, and the mobile communication subscribers in the coverage area that can serve them. Communicate wirelessly. At this time, the area where the call is impossible from the service area to the remote area by the buildings or tunnels in the city is called the 'shading area', and a relay device is installed to provide services in this shaded area.

However, the conventional frequency conversion repeater converts into an unused frequency band among several frequency bands within the same service frequency band and converts the signal into a narrow band adjacent frequency band for relaying. Therefore, the service band is also narrow, so that large capacity relay is not possible, and the conversion to adjacent frequency is low, so the separation is severe, and only one link antenna is installed in the link relay, so that many link relays are required. In addition, there was a problem of using a separate communication channel in case of a power failure by using a master / slave transmission in a relay failure state. In addition, since the frequency is relayed by simply converting multiple stages to analog, the noise level rises and the quality of service decreases.

In order to solve the above problems, the present invention converts all or part of the service frequency bands for base station mobile communication such as cellular, PCS, IMT2000, WCDMA, Wibro, etc. into the frequency of the surplus frequency band among other service frequency bands set by the operator. After relaying, it converts back to the base station service frequency for mobile communication and regenerates the service so that many mobile communication subscribers can talk at the same time, eliminating traffic jams, and is able to accommodate more subscribers without frequency interference due to adjacent frequencies. The purpose is to provide a device.

In order to achieve the above objects, the apparatus of the present invention includes a base station and a relay apparatus, which is capable of providing a wireless mobile communication service in a base station service area or a shadow area service area. After converting the forward signal of the service frequency band to the forward signal of the converted frequency band, it is distributed and transmitted to the repeaters in a plurality of shaded areas, respectively. A frequency conversion repeater for link converting the signal into a reverse frequency band of a service frequency band and transmitting the same to a base station; And converting the forward signal of the conversion frequency band received from the link frequency conversion relay device into the forward signal of the mobile communication service band in the forward direction to the shaded area and forwarding the reverse signal received from the mobile terminal in the reverse frequency band. And a plurality of shaded area repeaters, which are converted into reverse signals and transmitted to the link frequency conversion repeater.

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

First, the present invention is to set the cellular, PCS, IMT2000, Wibro frequency band by the operator according to the method of transmitting the subscriber signal in the remote shadow area in the mobile communication services such as cellular, PCS, IMT 2000, WCDMA, Wibro After converting to the excess frequency band of the service frequency band of the kind and transmitting it to the relay link, the frequency conversion to the cellular, PCS or IMT2000, WCDMA, Wibro service frequency band to service again.

1 is a schematic diagram showing the configuration of a base station and relay apparatus for mobile communication according to the present invention.

In general, a mobile communication network includes switching stations including a mobile communication switchboard and a base station control and splitter, a plurality of base stations connected to the switching center by an optical cable to provide mobile communication service in a base station service area, and a mobile communication service in a shadow area service area. It consists of a relay device and a mobile station for the shadow area service to provide a.

As shown in FIG. 1, the mobile communication network according to the present invention includes a base station transceiver 10 for transmitting and receiving a radio signal of a mobile communication service frequency band in a service area and a frequency different from the mobile communication service frequency band according to the present invention. It is composed of a link repeater 20 for transmitting to the shaded area repeater 30 by converting the band to the antenna. Accordingly, the mobile terminal 40 in the shadowed area is also connected to the mobile communication network via the shadowed area relay device 30 and the link relay device 20 to communicate or communicate with the other party.

Here, the mobile communication service frequency band is a base station transmission (downlink) when the mobile subscription radio telephone (cellular) is approximately 869MHz ~ 880MHz for Cellular (Cellular) 1, 880 ~ 884 MHz band for Cellular (Cellular) 2, The mobile station transmit (upward) frequency band is approximately 824 MHz to 835 MHz for cellular 1, and 835 MHz to 849 MHz for cellular 2, and the base station transmit (downward) frequency band is approximately 1840 MHz to 1870 MHz for personal cellular phone (PCS). The mobile station transmit (upward) frequency band is approximately 1750 MHz to 1780 GHz. In the case of IMT 2000, the mobile station transmission (upward) frequency band is approximately 1920 MHz to 1980 MHz, and the base station transmission (downward) frequency band is approximately 2110 MHz to 2170 MHz. The ISM band, which is a citizen band, is in the 2.4 ~ 2.48GHz band, and the ISM5 band is in the 5.725 ~ 5.825GHz band. Wibro is a frequency band of 2300-2390 MHz. These frequency bands are only an example, and may be changed according to the environment of each company and each country.

For example, when the cellular 1 frequency band is serviced by a base station, it is converted to an unused surplus frequency band among the cellular 2, PCS, IMT2000, Wibro, and ISM bands set by an operator, and then linked to a service repeater and then serviced by the service repeater. It receives the frequency band and reproduces and converts it back to the cellular 1 frequency band, radiates the radio wave to the antenna to serve the shadow area.

In another example, when the base station serves the PCS frequency, the base station service PCS receives the frequency band from the service repeater after converting to another service frequency band that is not used among the IMT2000, Wibro, and ISM bands. It converts and reproduces the frequency band and radiates the antenna to serve the shadow area. The reverse is the same way.

FIG. 2 is a block diagram showing the detailed configuration of the link relay shown in FIG.

As shown in FIG. 2, the link relay 20 includes a base station-side transmit / receive antenna 201, a first diplexer 202, a forward low noise amplifier (LNA) 203, and a forward up / down converter 204. ), Forward bandpass filter 205, forward high power amplifier (HPA: 206), second diplexer 207, reverse low noise amplifier (LNA: 208), reverse down / up converter 209, reverse bandpass filter (210), the reverse high power amplifier (HPA: 211), the coupling divider 212, the link side antenna (213-1 ~ 213-N), the fault detection unit 220, the mobile phone unit 230. In the embodiment of the present invention, 'service frequency band' refers to a frequency band of a corresponding mobile communication service before frequency conversion, and 'conversion frequency band' refers to a frequency band converted to an excess frequency band of another mobile communication service band for relaying. The signal from the base station to the terminal is defined as a 'forward signal', and the signal from the terminal to the base station is defined as a 'reverse signal'.

Referring to FIG. 2, the antenna 201 receives a radio signal of a service band or transmits a radio signal from the base station apparatus 10, and the first diplexer 202 transmits a forward signal from the base station to a forward low noise amplifier ( And transmits the reverse signal of the reverse high power amplifier 211 to the base station.

The forward low noise amplifier 203 amplifies the forward signal, and the forward up / down converter 204 combines the forward signal of the current service frequency band with a local oscillation signal not shown to forward signal of the surplus frequency (conversion frequency band) of another service. The uplink bandpass filter 205 passes only a forward signal of a desired frequency band from the uplink signal or downlink signal. The forward high power amplifier 206 amplifies the forward signal of the converted frequency band and transfers it to the combiner / divider 212 via the second diplexer 207. The combiner / divider 212 distributes the signals of the forward high power amplifier 206 and transmits the signals to the link antennas 213-1 to 213-N, and transmits the link antennas 213-1 to 213-N. And combines the received signal from the signal to the second diplexer 207.

The second diplexer 207 transfers the reverse signal of the converted frequency band received from each shader repeater 30 through the combiner / divider 212 to the reverse low noise amplifier 208, and the forward high power amplifier 206. Forward signal transmitted from the converted frequency band to the link antenna (213-1 ~ 213-N) side to branch the forward signal and the reverse signal. The reverse low noise amplifier 208 amplifies the reverse signal of the input conversion frequency band and outputs it to the down / up converter 209, and the reverse down / up converter 209 outputs the reverse signal of the input conversion frequency band to a local part, not shown. Mix with the oscillation signal to down- or up-convert to reverse signal of mobile communication service band. The reverse bandpass filter 210 passes only the corresponding mobile communication service frequency band in the downlink or upconverted reverse signal, and the reverse high power amplifier 211 amplifies the reverse signal of the bandpassed mobile communication service frequency band and then performs a first die. Transmit to the base station through the flexer 202.

The failure detection unit 220 monitors the operation state and the power state of the relay device and transmits the operation state monitoring data to the base station. In particular, the failure detection unit 220 monitors the output of the high power amplifier which is prone to failure.

The mobile phone unit 230 uses its own battery power independently of the relay device, and uses the corresponding mobile communication service network to detect the fault signal detected by the fault detection unit 220 using a central A / S center or a repeater supplier A. Send to / S center. In general, the conventional repeater supervisory control device uses a reverse communication network of the repeater, so if a problem occurs in the entire repeater, such as a power failure, the failure could not be transmitted, but the present invention uses a mobile phone unit 230 independent of the repeater, Even in this case, the fault signal is transmitted to the A / S center so that the relay device can be repaired urgently. At this time, since the cellular phone unit 230 uses its own charging power, it can operate even during a power failure.

As described above, the link relay 20 converts the forward signal of the mobile communication service frequency (cellular frequency band, PCS frequency band, or IMT2000 frequency band, WCDMA, Wibro) into the forward signal of the converted frequency band, 30), and receives the reverse signal of the converted frequency band from the shadow area relay device 30, converts it into the reverse signal of the corresponding mobile communication service frequency band, and transmits the reverse signal to the base station transceiver 10.

3 is a block diagram showing the detailed configuration of the shadow area relay apparatus shown in FIG.

As shown in FIG. 3, the shadow area relay 30 according to the present invention includes a link antenna 301, a first diplexer 302, a forward low noise amplifier (LNA) 303, and a forward down / Up converter 304, forward bandpass filter (BPF: 305), forward high power amplifier (HPA: 306), second diplexer 307, reverse low noise amplifier (LNA: 308), reverse up / down converter (309) ), A reverse band pass filter (BPF) 310, a reverse high power amplifier (HPA) 311, a service antenna 312, a failure detector 220, and a mobile phone unit 230.

Referring to FIG. 3, the first diplexer 302 of the conversion frequency band transfers the forward signal of the conversion frequency band received from the link antenna 301 to the forward low noise amplifier 303, and transmits the reverse high power amplifier 311. The reverse signal of the converted frequency band is transmitted to the link antenna 301 to branch the transmission / reception signal.

The forward low noise amplifier 303 amplifies the forward signal of the converted frequency band, and the forward down / up converter 304 combines the forward signal of the converted frequency band with a local oscillation signal, not shown, to lower or forward the forward signal of the mobile communication service band. The uplink bandpass filter 305 passes only the forward signal of a desired mobile communication service frequency band from the downlink or upconverted forward signal. The forward high power amplifier 306 amplifies the forward signal of the mobile communication service frequency band and transmits the signal to the mobile terminal 40 through the service antenna 312 through the second diplexer 307 of the mobile communication service frequency band.

The second diplexer 307 of the mobile communication service frequency band transmits a reverse signal of the mobile communication frequency band received from the mobile terminal 40 to the reverse low noise amplifier 308 through the service antenna 312, and performs a reverse low noise amplifier (308). 308 amplifies the reverse signal of the input mobile communication service frequency band and outputs the reverse signal to the up / down converter 309. The reverse up / down converter 309 mixes the reverse signal of the input mobile communication service frequency band with a local oscillation signal (not shown) to convert the signal up or down into the reverse signal of the conversion frequency band. The reverse bandpass filter 310 passes only the corresponding converted frequency band in the uplink or downconverted reverse signal, and the reverse high power amplifier 311 amplifies the reverse signal of the bandpass converted frequency band and then first diplexer 302. ) Is transmitted to the link relay device 20 through the link antenna 301.

The failure detection unit 220 monitors the operation state and the power state of the relay device and transmits the operation state monitoring data to the base station. In particular, the error detection unit 220 monitors the outputs of the high power amplifiers 306 and 311 which are prone to failure.

The mobile phone unit 230 uses its own battery power, which is always charged independently of the relay device, and supplies a central A / S center or repeater to the fault signal detected by the fault detection unit 220 using the corresponding mobile communication service network. Transfer to the company's after-sales center. In general, the conventional repeater supervisory control device uses a reverse communication network of the repeater, so if a problem occurs in the entire repeater, such as a power failure, the failure was not transmitted, but the present invention uses a cell phone unit 230 independent of the repeater In any case, the fault signal is sent to the A / S center for quick repair of the repeater.

Subsequently, the overall operation according to the present invention will be described by dividing the forward transmission transferred from the base station to the subscriber side and the reverse transmission transferred from the subscriber to the base station.

1. The flow of forward signal

Many subscriber signals transmitted from the base station controller and distributor installed in the switching center to the base station via the optical cable are transmitted to the base station service area through the base station transceiver 10 and to the link relay 20.

The forward signal of the mobile communication service band transmitted to the link relay device 20 is input to the low noise amplifier 203 via the diplexer 202, and the signal amplified by the low noise amplifier 203 is an up / down converter ( In 204, it is combined with the local oscillation signal and up- or down-converted into a forward signal of the conversion frequency band. Among the up- or down-converted signals, the forward signal of the converted frequency band passing through the band pass filter 205 is transferred to the high output amplifier 206 and amplified, and the high output amplifier 206 amplifies the forward signal of the converted frequency band to diplexer. Via 207 to the bond / distributor. The combiner / distributor 212 distributes the signal of the high power amplifier 206 and transmits the signal to the relay device 30 in the shaded area through each link antenna 213-1 to 213-N.

The shadow area relay device 30 transmits the forward signal of the converted frequency band received through the link antenna 301 to the low noise amplifier 303 through the diplexer 302. The forward signal amplified by the low noise amplifier 303 is combined with the local oscillation signal in the down / up converter 304 to be down- or up-converted into a forward signal of the mobile communication service frequency band. Among the down- or up-converted signals, the forward signal of the mobile communication service band passing through the band pass filter 305 is transferred to the high power amplifier 306 and amplified, and the high output amplifier 306 amplifies the forward signal of the mobile communication frequency band. Through the diplexer 307 and the service antenna 312 is sent to the mobile terminal 40 side.

I. Reverse signal flow

The reverse signal of the mobile communication frequency band received from the mobile terminal 40 through the service antenna 312 is input to the low noise amplifier 308 via the diplexer 307, and the signal amplified by the low noise amplifier 308 is up. The up / down converter 309 is combined with the local oscillation signal and up- or down-converted into a reverse signal of the conversion frequency band. Of the up- or down-converted signal, the reverse signal of the converted frequency band passing through the band pass filter 310 is transmitted to the high output amplifier 311, and the high output amplifier 311 amplifies the reverse signal of the converted frequency band to diplexer ( It transmits to the link relay device 20 side via the link antenna 301 via the 302.

The reverse signal of the converted frequency band received through the link antennas 213-1 to 213-N in the link relay 20 is combined by the combiner / divider 212 and then low noise through the diplexer 207. The reverse signal transmitted to the amplifier 208 and amplified by the low noise amplifier 208 is combined with the local oscillation signal in the down / up converter 209 to be down- or up-converted into the reverse signal of the mobile communication service band. Of the down- or up-converted signal, the reverse signal of the mobile communication service band passing through the band pass filter 210 is transmitted to the high power amplifier 211, and the high output amplifier 211 amplifies the reverse signal of the mobile communication frequency band to diflag. It passes through the antenna 202 to the base station apparatus 10 through the antenna 201.

FIG. 4 is a block diagram showing a detailed configuration of another example of the link frequency conversion relay shown in FIG. 1, and FIG. 5 is a block diagram showing a detailed configuration of another example of the shadow area frequency conversion relay shown in FIG. to be.

In another embodiment of the present invention is the same as the above-described embodiment except that the digital noise cancellers 410 and 510 are added to the reverse path of the link relay 20 and the forward path of the shadow area relay 30.

Referring to FIG. 4, it can be seen that the digital noise canceller 410 according to the present invention is added between the low noise amplifier 208 and the converter 209 in the reverse path of the link relay 20. The digital noise canceller 410 added to the link relay 20 includes a down converter 411, a filter 412, an amplifier 413, an analog-to-digital converter 414, as shown in FIG. Digital filter 415 and digital-to-analog converter 416. The down converter 411 down-converts the low noise amplified high frequency signal to facilitate digitalization, filters the filter 412, and then amplifies the amplifier 413. The signal amplified by the amplifier 413 is converted to digital in the analog-to-digital converter 414 and then the noise is removed from the digital filter 415 and converted back to an analog signal in the digital-to-analog converter 416 and then the converter 209. Is delivered to.

Referring to FIG. 5, it can be seen that the digital noise canceller 510 according to the present invention is added between the low noise amplifier 303 and the converter 304 in the forward path of the shadow area repeater 30. The digital noise canceller 510 added to the link repeater includes a down converter 511, a filter 512, an amplifier 513, an analog-to-digital converter 514, and a digital filter, as shown in FIG. 515, digital-to-analog converter 516. The down converter 511 down-converts the IF frequency band to easily digitalize the low noise amplified high frequency signal, filters the filter 512, and then amplifies the amplifier 513. The signal amplified by the amplifier 513 is converted to digital by the analog-to-digital converter 514 and then the noise is removed by the digital filter 515 and converted back to an analog signal by the digital-to-analog converter 516 and then upconverter 304 It is transferred to the service frequency band through the conversion band pass filter 305, high power amplifier 306, diplexer 307 to service.

The above description is just one embodiment, and the present invention may be variously applied by applying the present invention, and the relay frequency band may also be configured and serviced in various ways.

As described above, the present invention can greatly increase the relay capacity by relaying the same service band dedicated capacity by converting the same service band into an unused broadband frequency band among completely different service bands. Good separation, no interference, and multiple link outputs are distributed to one repeater, so that multiple antennas can be installed in multiple directions to efficiently relay to one link repeater.

In addition, even if a power failure occurs in the case of a relay failure, the mobile communication cell phone is used as it is, so that the failure status can be reported to the operator or the relay device provider A / S center without interruption without a separate power supply. By service, noise can be drastically reduced to provide high quality call quality.

Claims (4)

delete In the forward direction, the forward signal of the mobile communication service band is converted into the forward signal of the converted frequency band, which is an unused surplus frequency band among other service frequency bands, distributed and transmitted to the repeater in a plurality of shaded areas, respectively. A frequency conversion repeater for link which combines the reverse signals of the converted frequency band received from the local repeater, converts the signal into the reverse signal of the mobile communication service band, and transmits the reverse signal to the base station; Converts the forward signal of the converted frequency band into the forward signal of the mobile communication service band and transmits it to the shaded area, and converts the reverse signal received from the mobile terminal to the reverse frequency band of the converted frequency band to the link frequency conversion relay device in the reverse direction. Multiple shadow areas to transmit In the frequency band conversion repeater consisting of a repeater, The frequency conversion relay device for the link A first diplexer 202 for branching the forward signal from the base station to the forward signal of the mobile communication service frequency band; A forward low noise amplifier 203 for amplifying a forward signal received from the first diplexer 202 in a mobile communication service frequency band; A forward converter 204 for combining the forward signal received from the forward low noise amplifier 203 with a local oscillation signal and converting the forward signal into a converted frequency signal; A forward bandpass filter 205 for passing only a forward signal of a desired conversion frequency band from the signal converted by the forward converter 204; A forward high output amplifier 206 for amplifying the forward signal of the converted frequency band passing through the forward bandpass filter 205; A second diplexer 207 for branching the forward signal of the converted frequency band and the reverse signal of the converted frequency band; When transmitting, the signal of the forward high power amplifier 206 is distributed to each link antenna, and when received, the signal received from each link antenna is combined and transmitted to the second diplexer 207. / Distributor 212; A reverse low noise amplifier (208) for amplifying the converted reverse signal received by the second diplexer (207); A reverse converter 209 for converting the reverse signal of the converted frequency band input from the reverse low noise amplifier 208 with the local oscillation signal and converting the reverse signal into a reverse signal of the mobile communication service frequency band; A reverse band pass filter 210 for passing only a reverse signal of a corresponding mobile communication service frequency band from the reverse signal converted by the reverse converter 209; A reverse high power amplifier (211) for amplifying a reverse signal of the mobile communication service band passed by the reverse band pass filter (210) to the base station through the first diplexer (202); A fault detection unit 220 for detecting a fault state by monitoring an operation state and a power state of the relay device; And Independent of the relay device using its own battery power, and includes a cell phone unit 230 for transmitting the fault signal detected by the fault detection unit 220 to the central A / S center or the A / S center of the repeater supplier company Frequency band conversion repeater, characterized in that configured to. In the forward direction, the forward signal of the mobile communication service band is converted into the forward signal of the converted frequency band, which is an unused surplus frequency band among other service frequency bands, distributed and transmitted to the repeater in a plurality of shaded areas, respectively. A frequency conversion repeater for link which combines the reverse signals of the converted frequency band received from the local repeater, converts the signal into the reverse signal of the mobile communication service band, and transmits the reverse signal to the base station; Converts the forward signal of the converted frequency band into the forward signal of the mobile communication service band and transmits it to the shaded area, and converts the reverse signal received from the mobile terminal to the reverse frequency band of the converted frequency band to the link frequency conversion relay device in the reverse direction. Multiple shadow areas to transmit In the frequency band conversion repeater consisting of a repeater, The shaded area repeater A first diplexer 302 for branching the forward signal of the converted frequency band and the reverse signal of the converted frequency band; A forward low noise amplifier 303 for amplifying the forward signal received in the conversion frequency band received by the first diplexer 302; A forward converter 304 for mixing the forward signal input from the forward low noise amplifier 303 with the local oscillation signal and converting the forward signal into a forward signal of the mobile communication service band; A forward bandpass filter 305 for passing only a forward signal of a corresponding mobile communication service frequency band from the forward signal converted by the forward converter 304; A forward high power amplifier 306 for amplifying the forward signal of the mobile communication service band passed by the forward band pass filter 305; A second diplexer 307 which transmits a forward signal of the mobile communication service frequency band of the forward high power amplifier 306 to the antenna side and branches the reverse signal of the mobile communication service frequency band received through the antenna; A reverse low noise amplifier 308 for amplifying a reverse signal of a mobile communication service frequency band received from the second diplexer 307; A reverse converter 309 for converting a reverse signal of the mobile communication service frequency band received from the reverse low noise amplifier 308 with a local oscillation signal and converting the reverse signal into a reverse signal of a conversion frequency band; A reverse band pass filter 310 for passing only a reverse signal of a desired conversion frequency band from the reverse signal converted by the reverse converter 309; A reverse high power amplifier (311) for amplifying a reverse signal of the converted frequency band passing through the reverse band pass filter (310) and outputting the reverse signal to the antenna through the first diplexer (302); A fault detection unit 220 for detecting a fault state by monitoring an operation state and a power state of the relay device; And It is equipped with a mobile phone unit 230 using its own battery power independent of the relay device, and transmits the fault signal detected by the fault detection unit 220 to the central A / S center or the A / S center of the repeater supplier company A frequency band conversion relay device characterized in that. delete

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