KR20060084295A - Mobile communication terminal capable of controlling impedance matching of power amplifier's output port according to received signal strength indication - Google Patents

Mobile communication terminal capable of controlling impedance matching of power amplifier's output port according to received signal strength indication Download PDF

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KR20060084295A
KR20060084295A KR1020050005113A KR20050005113A KR20060084295A KR 20060084295 A KR20060084295 A KR 20060084295A KR 1020050005113 A KR1020050005113 A KR 1020050005113A KR 20050005113 A KR20050005113 A KR 20050005113A KR 20060084295 A KR20060084295 A KR 20060084295A
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power amplifier
output
received signal
impedance matching
signal strength
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한승엽
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주식회사 팬택앤큐리텔
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B2101/00—Type of solid waste
    • B09B2101/02—Gases or liquids enclosed in discarded articles, e.g. aerosol cans or cooling systems of refrigerators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • B07B1/4609—Constructional details of screens in general; Cleaning or heating of screens constructional details of screening surfaces or meshes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • B07B1/50—Cleaning
    • B07B1/52—Cleaning with brushes or scrapers
    • B07B1/522—Cleaning with brushes or scrapers with brushes
    • B07B1/524—Cleaning with brushes or scrapers with brushes the brushes being rotating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
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    • B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material

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Abstract

본 발명은 이동통신 단말기에 관한 것으로, 특히 전력 증폭된 RF 무선 신호를 안테나를 통해 최적으로 방출할 수 있도록 하는 기술에 관한 것이다.The present invention relates to a mobile communication terminal, and more particularly, to a technology for optimally emitting a power amplified RF radio signal through an antenna.

본 발명에 따른 이동통신 단말기는 RF 송신신호의 전력을 증폭하여 출력하는 전력증폭기를 포함하는 RF 송신부와; 상기 RF 송신부의 전력증폭기 출력단과 안테나 사이에 위치한 서로 다른 다수의 임피던스 매칭 회로들을 포함하는 정합부와; 상기 RF 송신부의 전력증폭기 출력단에 위치하며, 제어신호에 따라 상기 전력증폭기를 통해 증폭된 RF 송신신호를 특정 임피던스 매칭 회로로 출력시키는 출력 선택부와; 안테나를 통해 수신된 RF 수신신호의 세기(RSSI : Received Signal Strength Indication)를 측정하는 수신신호강도 측정부와; 장치 전반을 제어하며, 상기 수신신호강도 측정부에 의한 측정 결과에 따라 상기 출력 선택부로 해당 제어신호를 출력하는 제어부;를 포함하는 것을 특징으로 한다.According to an aspect of the present invention, there is provided a mobile communication terminal comprising: an RF transmitter including a power amplifier configured to amplify and output power of an RF transmission signal; A matching unit including a plurality of different impedance matching circuits located between the power amplifier output terminal and the antenna of the RF transmitter; An output selector positioned at a power amplifier output of the RF transmitter and configured to output an RF transmission signal amplified by the power amplifier to a specific impedance matching circuit according to a control signal; A received signal strength measuring unit measuring a received signal strength indication (RSSI) of the RF received signal received through the antenna; And a controller which controls the entire apparatus and outputs a corresponding control signal to the output selector according to the measurement result by the received signal strength measuring unit.

이동통신 단말기, 전력증폭기, 수신신호세기(RSSI), 임피던스 매칭.Mobile terminal, power amplifier, received signal strength (RSSI), impedance matching.

Description

수신신호세기에 따른 송신 전력증폭기 출력단 정합 제어 가능한 이동통신 단말기{Mobile communication terminal capable of controlling impedance matching of power amplifier's output port according to Received Signal Strength Indication}Mobile communication terminal capable of controlling impedance matching of power amplifier's output port according to Received Signal Strength Indication}

도 1은 본 발명의 바람직한 실시예에 따른 이동통신 단말기 구성을 개략적으로 도시한 블록도.1 is a block diagram schematically showing the configuration of a mobile communication terminal according to a preferred embodiment of the present invention.

본 발명은 이동통신 단말기에 관한 것으로, 특히 전력 증폭된 RF 무선 신호를 안테나를 통해 최적으로 방출할 수 있도록 하는 기술에 관한 것이다.The present invention relates to a mobile communication terminal, and more particularly, to a technology for optimally emitting a power amplified RF radio signal through an antenna.

이동통신 단말기는 안테나를 통해 수신되는 신호의 RSSI(Received Signal Strength Indication)를 측정하여 수신단의 저잡음 증폭기(LNA : Low Noise Amplifier)를 여러 이득(Gain)으로 제어한다. 통상 이동통신 단말기는 약전계/강전계 혹은 약전계/중전계/강전계에 따라 LNA를 2단 혹은 3단으로 이득 제어하여 수신 감도를 향상시킨다. The mobile communication terminal measures Received Signal Strength Indication (RSSI) of a signal received through an antenna and controls a low noise amplifier (LNA) of a receiving end with various gains. In general, a mobile communication terminal improves reception sensitivity by controlling LNA to two or three stages according to a weak electric field / strong electric field or a weak electric field / medium electric field / strong electric field.

또한 이동통신 단말기는 전계의 강약에 따라 송신 파워(Tx power)를 조절하 게 되는데, 이를 위해 RF 송신부의 최종단에서 충분한 전력을 가진 신호를 내보낼 수 있도록 전력 증폭하는 전력증폭기(PA : Power Amplifier)의 증폭 정도를 제어한다. 이에 따라 전력증폭기(PA)는 약전계의 경우에 높은 전력으로 RF 송신 신호를 증폭하여 출력하고, 강전계의 경우에 약전계보다 낮은 전력으로 RF 송신 신호를 증폭하여 출력한다.In addition, the mobile communication terminal adjusts the transmission power (Tx power) according to the strength of the electric field. For this purpose, a power amplifier (PA) that amplifies the power so that a signal having sufficient power can be output from the final stage of the RF transmitter. Controls the degree of amplification. Accordingly, the power amplifier PA amplifies and outputs the RF transmission signal with high power in the case of the weak electric field, and amplifies and outputs the RF transmission signal with power lower than the weak electric field in the case of the strong electric field.

종래 전력증폭기(PA) 출력단과 안테나 사이에는 임피던스 차에 의한 반사를 줄이려는 단일 임피던스 매칭단이 존재한다. 그러나 단일 임피던스 매칭단으로는 RSSI에 따라 달라지는 송신 전력을 제대로 제어할 수 없게 된다. 예를 들어 약전계에서는 송신 전력을 최적으로 방출할 수 없게 하며, 강전계에서는 불필요하게 송신 전력을 높게 방출하게 하여 전자파 흡수율(SAR : Specific Absorption Rate)이 기준치를 초과할 수 있게 되는 문제점을 야기한다.Conventional power amplifier PA has a single impedance matching stage between the output stage and the antenna to reduce reflection by the impedance difference. However, a single impedance matching stage cannot properly control the transmission power depending on RSSI. For example, weaker electric fields do not emit optimal transmit power, while high electric fields unnecessarily emit high transmit power, causing a problem that the Specific Absorption Rate (SAR) may exceed the reference value. .

본 발명은 이러한 문제점을 해결하기 위한 것으로, 이동통신 단말기가 수신신호세기에 따라 가변되는 송신 전력을 최적으로 방출할 수 있도록 하는 임피던스 매칭을 제공하는 것을 목적으로 한다.An object of the present invention is to provide an impedance matching that enables a mobile communication terminal to optimally emit a transmission power that varies depending on the received signal strength.

상술한 목적을 달성하기 위한 본 발명의 일 양상에 따른 이동통신 단말기는 RF 송신부의 전력증폭기 출력단에 단일 임피던스 매칭 회로가 아닌 서로 다른 다수의 임피던스 매칭 회로를 구비한다. 이동통신 단말기는 기지국으로부터 전송되어 안테나를 통해 수신되는 RF 수신신호의 세기(RSSI)를 검출하고, 검출된 RSSI 레벨 에 따라 전력증폭기를 통한 RF 송신신호의 전력 증폭 정도를 제어한다. 그리고 전력증폭기의 출력단이 그에 적합한 임피던스 매칭 회로를 통해 최적의 정합이 이루어지도록 제어한다.According to an aspect of the present invention, a mobile communication terminal includes a plurality of impedance matching circuits different from each other, not a single impedance matching circuit, at an output terminal of an RF amplifier. The mobile communication terminal detects the strength (RSSI) of the RF received signal transmitted from the base station and received through the antenna, and controls the power amplification degree of the RF transmission signal through the power amplifier according to the detected RSSI level. The output stage of the power amplifier is controlled to achieve an optimum match through an impedance matching circuit.

본 발명의 이 같은 양상에 따라 본 발명에 따른 이동통신 단말기는 RSSI를 검출하여 RF 송신부의 전력 증폭기 출력단이 최적의 임피던스 매칭 회로를 통해 정합이 이루어지도록 제어하므로, 강전계/중전계/약전계에 상관 없이 적절한 송신 전력으로 신호를 방출할 수 있게 된다. 또한 특히 약전계의 경우 지적한 바와 같은 전자파 흡수율(SAR : Specific Absorption Rate)이 스펙에 따른 범위를 만족할 수 있도록 한다. According to this aspect of the present invention, the mobile communication terminal according to the present invention detects the RSSI and controls the power amplifier output terminal of the RF transmitter to be matched through an optimal impedance matching circuit, so that it is applied to the strong electric field, the medium electric field, and the weak electric field. Regardless, it is possible to emit a signal at an appropriate transmit power. In particular, in the case of the weak electric field, the specific absorption rate (SAR), as indicated, can satisfy the range according to the specification.

전술한, 그리고 추가적인 본 발명의 양상들은 첨부된 도면을 참조하여 설명되는 바람직한 실시예들을 통하여 더욱 명백해질 것이다. 이하에서는 본 발명을 이러한 실시예를 통해 당업자가 용이하게 이해하고 재현할 수 있도록 상세히 설명하기로 한다. The foregoing and further aspects of the present invention will become more apparent through the preferred embodiments described with reference to the accompanying drawings. Hereinafter, the present invention will be described in detail to enable those skilled in the art to easily understand and reproduce the present invention.

도 1은 본 발명의 바람직한 실시예에 따른 이동통신 단말기 구성을 개략적으로 도시한 블록도이다. RSSI 검출부(100)는 안테나를 통해 수신되는 RF 수신신호로부터 수신신호세기(RSSI : Received Signal Strength Indication)를 검출한다. RSSI는 이미 알려진 바와 같이 RF 수신부(도시하지 않음)의 아날로그 영역인 기저대역 부분에서 검출되고, 검출된 RSSI가 디지탈-아날로그 변환부(DAC : Digital/Anagog Converter)를 통해 디지탈 값으로 변환되어 후술할 제어부(200)로 출력될 수 있다. 아니면 국내특허공보인 '공개번호 2004-5295'에 기술된 바와 같 이 RSSI 검출 자체가 디지털 영역에서 이루어질 수도 있다. 1 is a block diagram schematically showing the configuration of a mobile communication terminal according to an embodiment of the present invention. The RSSI detector 100 detects a received signal strength indication (RSSI) from an RF received signal received through an antenna. RSSI is detected in the baseband portion, which is an analog region of an RF receiver (not shown), as already known, and the detected RSSI is converted into a digital value through a digital-to-analog converter (DAC) to be described later. It may be output to the control unit 200. Alternatively, as described in Korean Patent Publication No. 2004-5295, RSSI detection itself may be performed in the digital domain.

RSSI 검출부(100)는 주지된 바와 같은 기술적 방식을 통해 수신된 RF 수신신호로부터 수신신호세기인 RSSI를 검출하여 제어부(200)로 출력한다. 제어부(200)는 바람직하게 (주)퀄컴의 MSM(Mobile Station Modem)칩의 일부 로직으로 구현될 수 있으며, 마이크로 프로세서를 뜻한다. 이러한 제어부(200)는 이미 알려진 바와 같이 단말기의 전반적인 동작을 제어하며, RSSI 검출부(100)로부터 검출된 RSSI에 따라 수신감도를 일정 레벨 유지시키기 위하여 RF 수신부(도시하지 않음)를 제어한다. The RSSI detector 100 detects the RSSI, which is a received signal strength, from the RF received signal received through the technical method as described above, and outputs the RSSI to the controller 200. The control unit 200 may be implemented by some logic of the MSM chip of Qualcomm Co., Ltd., and refers to a microprocessor. As described above, the controller 200 controls the overall operation of the terminal, and controls an RF receiver (not shown) to maintain a predetermined level of reception sensitivity according to the RSSI detected from the RSSI detector 100.

예를 들어 이동통신 단말기가 RSSI에 따라 강전계/중전계/약전계로 그 레벨을 구분한다면, 제어부(200)는 RSSI 검출부(100)로부터 검출된 RSSI에 따라 RF 수신부의 구성인 저잡음 증폭기(LNA : Low Noise Amplifier)를 3단 증폭 제어할 수 있다. 또한 제어부(200)는 검출된 RSSI에 따라 RF 송신신호의 파워를 조절하는데, RSSI와 송신전력의 반비례 특성에 따라 그에 맞게 RF 송신신호의 파워를 조절한다. 즉, 검출된 RSSI가 낮으면 송신전력을 높히고, 검출된 RSSI가 높으면 송신전력을 낮추도록 제어한다.For example, if the mobile communication terminal classifies the level into a strong electric field, a medium electric field, and a weak electric field according to the RSSI, the control unit 200 may configure a low noise amplifier (LNA) which is a configuration of the RF receiver according to the RSSI detected from the RSSI detecting unit 100. Low noise amplifier can be controlled in three stages of amplification. In addition, the controller 200 adjusts the power of the RF transmission signal according to the detected RSSI, and adjusts the power of the RF transmission signal according to the inverse characteristic of the RSSI and the transmission power. That is, if the detected RSSI is low, the transmit power is increased. If the detected RSSI is high, the transmit power is reduced.

이를 위해 제어부(200)는 RF 송신부(300)의 구성들 중 최종단에 위치한 전력증폭기(PA : Power Amplifier)의 전력 증폭 정도를 제어한다. 바람직하게 제어부(200)는 전력증폭기(PA)(310)는 강전계/중전계/약전계에 따라 3단으로 전력 증폭을 제어할 수 있다. RF 수신신호로부터 검출된 RSSI에 따라 송신전력의 증폭 정도를 제어하는 기술 자체는 이미 널리 알려진 주지된 사항이므로 상세한 설명은 생략한 다.To this end, the controller 200 controls a degree of power amplification of a power amplifier (PA) located at a final stage among the components of the RF transmitter 300. Preferably, the control unit 200 may control power amplification in three stages according to the power amplifier (PA) 310 according to the strong electric field, the medium electric field, and the weak electric field. Since the technology itself for controlling the amplification degree of the transmission power in accordance with the RSSI detected from the RF received signal is well known and well known, detailed description thereof will be omitted.

본 발명의 특징적인 양상에 따라 이동통신 단말기는 RF 송신부(300)의 전력증폭기(310) 출력단에 단일 임피던스 매칭 회로가 아닌 다수의 서로 다른 임피던스 매칭 회로들을 포함하는 정합부(400)를 포함한다. 이동통신 단말기가 검출된 RSSI에 따라 강전계/중전계/약전계로 구분한다면, 정합부(400)는 이에 따른 최적의 제 1 임피던스 매칭 회로(강전계의 경우)(410), 제 2 임피던스 매칭 회로(중전계의 경우)(420), 제 3 임피던스 매칭 회로(약전계의 경우)(430)들을 포함할 수 있다.According to a characteristic aspect of the present invention, a mobile communication terminal includes a matching unit 400 including a plurality of different impedance matching circuits, not a single impedance matching circuit, at an output terminal of the power amplifier 310 of the RF transmitter 300. If the mobile communication terminal is divided into a strong electric field / a medium electric field / a weak electric field according to the detected RSSI, the matching unit 400 according to the optimum first impedance matching circuit (in the case of a strong electric field) 410, the second impedance matching circuit (In the case of a medium electric field) 420, and a third impedance matching circuit (in the case of a weak electric field) 430.

제어부(200)는 RSSI 검출부(100)에 의해 검출된 RSSI에 따라 어떤 임피던스 매칭 회로를 사용할 것인지를 결정한다. 검출된 RSSI 레벨이 강전계를 나타내는 경우, 제어부(200)는 RF 송신부(300)의 전력증폭기(310) 출력단에 제 1 임피던스 매칭 회로(410)가 구성되도록 출력 선택부(500)로 해당 제어신호를 출력한다. 바람직하게 출력 선택부(500)는 디멀티플렉서(Demultiplexer)로 구현될 수 있다. 또한 바람직하게 제어부(200)는 주지된 바와 같은 직렬 버스 인터페이스(SBI : Serial Bus Interface)를 통해 그 형식에 맞게 해당 제어신호를 출력 선택부(500)로 출력하게 된다.The controller 200 determines which impedance matching circuit to use according to the RSSI detected by the RSSI detector 100. When the detected RSSI level indicates a strong electric field, the control unit 200 transmits the control signal to the output selector 500 so that the first impedance matching circuit 410 is configured at the output terminal of the power amplifier 310 of the RF transmitter 300. Outputs Preferably, the output selector 500 may be implemented as a demultiplexer. Also preferably, the control unit 200 outputs the control signal to the output selection unit 500 in accordance with the format through a serial bus interface (SBI) as is well known.

출력 선택부(500), 바람직하게 디멀티플렉서(DEMUX)(500)는 제어부(200)로부터 출력된 제어신호에 따라 전력증폭기(310)로부터 전력 증폭되어 출력된 RF 송신신호를 해당 임피던스 매칭 회로(강전계의 경우 제 1 임피던스 매칭 회로(410))를 경유하여 안테나를 통해 방사되도록 처리한다.The output selector 500, preferably the demultiplexer (DEMUX) 500, performs power amplification from the power amplifier 310 according to a control signal output from the controller 200 and outputs the RF transmission signal outputted from a corresponding impedance matching circuit (a strong electric field). In the case of the first impedance matching circuit 410 is processed to be radiated through the antenna.

상술한 바와 같이 본 발명에 따른 이동통신 단말기는 RSSI를 검출하여 RF 송신부의 전력 증폭기 출력단이 최적의 임피던스 매칭 회로를 통해 정합이 이루어지도록 제어하므로, 강전계/중전계/약전계에 상관 없이 적절한 송신 전력으로 신호를 방출할 수 있게 된다. 또한 특히 약전계의 경우 지적한 바와 같은 전자파 흡수율(SAR : Specific Absorption Rate)이 스펙에 따른 범위를 만족할 수 있도록 한다.  As described above, the mobile communication terminal according to the present invention detects the RSSI and controls the power amplifier output terminal of the RF transmitter so that matching is performed through an optimal impedance matching circuit, so that a proper transmission regardless of the strong electric field, the medium electric field, and the weak electric field is achieved. It is possible to emit a signal with power. In particular, in the case of the weak electric field, the specific absorption rate (SAR), as indicated, can satisfy the range according to the specification.

한편 본 발명은 도면에 도시된 실시예들을 참고로 설명되었으나 이는 예시적인 것에 불과하며, 당해 기술분야에 통상의 지식을 지닌 자라면 이로부터 다양한 변형 및 균등한 타실시예가 가능하다는 점을 이해할 것이다. 따라서 본 발명의 진정한 기술적 보호범위는 첨부된 특허청구범위에 의해서만 정해져야 할 것이다.On the other hand, the present invention has been described with reference to the embodiments shown in the drawings, which are merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be defined only by the appended claims.

Claims (3)

RF 송신신호의 전력을 증폭하여 출력하는 전력증폭기를 포함하는 RF 송신부와;An RF transmitter comprising a power amplifier for amplifying and outputting power of an RF transmission signal; 상기 RF 송신부의 전력증폭기 출력단과 안테나 사이에 위치한 서로 다른 다수의 임피던스 매칭 회로들을 포함하는 정합부와;A matching unit including a plurality of different impedance matching circuits located between the power amplifier output terminal and the antenna of the RF transmitter; 상기 RF 송신부의 전력증폭기 출력단에 위치하며, 제어신호에 따라 상기 전력증폭기를 통해 증폭된 RF 송신신호를 특정 임피던스 매칭 회로로 출력시키는 출력 선택부와;An output selector positioned at a power amplifier output of the RF transmitter and configured to output an RF transmission signal amplified by the power amplifier to a specific impedance matching circuit according to a control signal; 안테나를 통해 수신된 RF 수신신호의 세기(RSSI : Received Signal Strength Indication)를 측정하는 수신신호강도 측정부와;A received signal strength measuring unit measuring a received signal strength indication (RSSI) of the RF received signal received through the antenna; 장치 전반을 제어하며, 상기 수신신호강도 측정부에 의한 측정 결과에 따라 상기 출력 선택부로 해당 제어신호를 출력하는 제어부;A controller which controls the whole apparatus and outputs a corresponding control signal to the output selector according to the measurement result by the received signal strength measuring unit; 를 포함하는 것을 특징으로 하는 수신신호세기에 따른 송신 전력증폭기 출력단 정합 제어 가능한 이동통신 단말기.A mobile communication terminal capable of matching and controlling the output power amplifier output stage according to the received signal strength. 제 1 항에 있어서, 상기 출력 선택부가 디멀티플렉서(Demultiplexer)인 것을 특징으로 하는 수신신호세기에 따른 송신 전력증폭기 출력단 정합 제어 가능한 이동통신 단말기.The mobile terminal according to claim 1, wherein the output selector is a demultiplexer. 제 1 항 또는 제 2 항에 있어서, 상기 제어부가 상기 출력 선택부로 제어신호를 출력하는 것은 직렬 버스 인터페이스(SBI : Serial Bus Interface)를 이용한 것을 특징으로 하는 수신신호세기에 따른 송신 전력증폭기 출력단 정합 제어 가능한 이동통신 단말기.The output power control unit according to claim 1 or 2, wherein the control unit outputs a control signal to the output selection unit using a serial bus interface (SBI). Possible mobile terminal.
KR1020050005113A 2005-01-19 2005-01-19 Mobile communication terminal capable of controlling impedance matching of power amplifier's output port according to received signal strength indication KR20060084295A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101225487B1 (en) * 2012-09-03 2013-01-23 주식회사 하이텍이피씨 Apparatus for communication relaying control of a repeater

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101225487B1 (en) * 2012-09-03 2013-01-23 주식회사 하이텍이피씨 Apparatus for communication relaying control of a repeater

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