KR100255307B1 - Transmitting power control circuit of base station - Google Patents

Transmitting power control circuit of base station Download PDF

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Publication number
KR100255307B1
KR100255307B1 KR1019970026758A KR19970026758A KR100255307B1 KR 100255307 B1 KR100255307 B1 KR 100255307B1 KR 1019970026758 A KR1019970026758 A KR 1019970026758A KR 19970026758 A KR19970026758 A KR 19970026758A KR 100255307 B1 KR100255307 B1 KR 100255307B1
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South Korea
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signal
converter
power
transmission
base station
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KR1019970026758A
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Korean (ko)
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KR19990002989A (en
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황의인
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김영환
현대전자산업주식회사
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/146—Uplink power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/241—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/32—TPC of broadcast or control channels
    • H04W52/325—Power control of control or pilot channels

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Transmitters (AREA)

Abstract

PURPOSE: A transmitting power control circuit of a base station is provided to minimize a mutual interruption between base stations and maintain a uniform speech quality by dynamically measuring and controlling the power of a transmission signal of a forward channel transmitted from a base station to a mobile station. CONSTITUTION: A frequency up-converter(1) converts up an intermediate frequency(IF) signal of a forward link of a base station to a transmission frequency signal and outputs it. A high power amplifier(HPA)(2) amplifies the power of the transmission signal outputted from the frequency up-converter(1) as high as a predetermined power. A directional coupler(3) couples the transmission signal to measure a power strength of the transmission signal amplified by the HPA(2). A band pass filter(BPF)(6) filters a certain band of the transmission signal outputted through the directional coupler(3) and radiates it externally through a transmission antenna. A detection circuit(5) converts the transmission signal coupled by the directional coupler(3) to a DC signal by using a Schottky diode. An A/D converter(6) converts the DC signal converted by the detection circuit(5) to a digital signal. A controller(7) monitors and controls a power level for the transmission signal of the forward channel transmitted from the base station by using the digital signal converted by the A/D converter(6). A comparator(8) compares the DC signal converted by the detection circuit(5) and the control signal outputted from the controller(7), amplifies it and outputs a DC signal, a substantial control voltage, to the frequency up-converter(1).

Description

기지국의 송신전력 제어 회로Transmission power control circuit of base station

본 발명은 통신 시스템의 기지국에서 이동국으로 송신되는 순방향 채널의 송신신호의 전력을 동적으로 측정 및 조절함으로써 기지국 간의 상호 간섭을 최소화하고 균일한 통화 품질을 유지할 수 있도록 한 기지국의 송신전력 제어 회로에 관한 것이다.The present invention relates to a transmission power control circuit of a base station for minimizing mutual interference and maintaining uniform call quality by dynamically measuring and adjusting power of a transmission signal of a forward channel transmitted from a base station of a communication system to a mobile station. will be.

일반적으로, 기지국과 이동국 간의 송/수신신호에 대한 전력제어가 필요한 것은 근원 간섭 문제(Near-Far Interference Problem)를 해결하고 비트 에러율(Bit Error Rate)과 이동국 간의 간섭 문제 및 허용 가능한 최소의 Eb/N0를 유지하기 위해서이다.In general, the need for power control of transmission / reception signals between a base station and a mobile station solves the Near-Far Interference Problem, the bit error rate and the interference between the mobile station, and the minimum allowable E b. To keep / N 0 .

즉, 방사되는 전파의 가능한 가장 낮은 전력레벨로도 시스템 성능을 유지할 수 있도록 이동국과 기지국의 송신전력을 알맞은 레벨로 조절해야 한다.That is, the transmission power of the mobile station and the base station should be adjusted to an appropriate level so that the system performance can be maintained even at the lowest possible power level of radiated radio waves.

종래 기지국에서의 순방향 채널의 송신신호에 대한 전력 제어는 이동국으로 부터 전력 측정 보고 메시지를 받아 레지스터의 FER(Frame Error Rate)를 기준치와 비교하여 전력 제어 여부를 결정한 후, 해당 채널의 송신전력을 증가 또는 감소시킨다.In the conventional base station, power control of a transmission signal of a forward channel receives a power measurement report message from a mobile station, compares a frame error rate (FER) with a reference value, determines whether to control power, and then increases transmission power of a corresponding channel. Or reduce.

이때, 상기 FER이 기준치보다 크면 현재 트래픽 채널의 전력을 증가시키고, FER이 기준치보다 작으면 현재 트래픽 채널의 전력을 감소시킨다.At this time, if the FER is greater than the reference value, the power of the current traffic channel is increased, and if the FER is less than the reference value, the power of the current traffic channel is reduced.

또한, 이동국으로부터 일정 시간 동안 PMRM(Power Measurement Report Message)이 보고되지 않으면 전력은 감소시킨다.In addition, power is reduced if no PMRM (Power Measurement Report Message) is reported from the mobile station for a period of time.

그러나, 상기와 같은 종래 기지국에서의 순방향 채널의 송신신호에 대한 전력 제어는 기지국 간의 상호 간섭으로 인하여 정확한 송신 전력을 측정하기가 어렵고, 이에 따라 적절한 전력 제어가 이루어지지 않아 균일한 통화 품질을 제공하지 못하게 되는 문제점이 있었다.However, the power control of the transmission signal of the forward channel in the conventional base station is difficult to measure the correct transmission power due to mutual interference between the base stations, and thus does not provide uniform call quality because proper power control is not achieved. There was a problem that prevented.

본 발명은 상기와 같은 문제점은 해결하기 위해 안출한 것으로서, 그 목적은 기지국에서 이동국으로 송신되는 순방향 채널의 송신신호의 전력을 동적으로 측정 및 조절함으로써 기지국 간의 상호 간섭을 최소화하고 균일한, 통화 품질을 유지할 수 있도록 한 기지국의 송신전력 제어 회로를 제공하는 데에 있다.The present invention has been made to solve the above problems, the object of which is to measure and adjust the power of the transmission signal of the forward channel transmitted from the base station to the mobile station by minimizing mutual interference between the base stations and uniform, call quality The present invention provides a transmission power control circuit of a base station so as to maintain.

이러한 목적을 달성하기 위한 본 발명의 기지국의 송신전력 제어 회로는, 대 전력 증폭기를 통해 증폭된 주파수 상향 변환기의 송신신호를 방향성 결합기에 의해 커플링하고, 이어 이 커플링된 송신신호를 검출회로부를 통해 DC 신호로 변환한 후 A/D 컨버터와 비교기에 각각 출력하며, 상기 A/D 컨버터의 디지털 신호에 따른 제어부의 트래숄드 관련 제어신호에 따라 비교기가 상기 검출회로부에서 변환된 DC 신호와 상기 제어부에서 출력되는 신호를 비교 및 증폭하여 실제적인 제어전압인 DC 신호를 주파수 상향 변환기의 업-컨버터의 이득 제어부에 공급함으로써 기지국에서 이동국으로 송신되는 순방향 채널에 대한 송신신호의 전력은 제어할 수 있도록 함을 특징으로 한다.The transmission power control circuit of the base station of the present invention for achieving this object is coupled to the transmission signal of the frequency up-converter amplified through a large power amplifier by the directional coupler, and then the coupled transmission signal to the detection circuit unit After converting into a DC signal through the A / D converter and a comparator, respectively, the comparator according to the threshold-related control signal of the control unit according to the digital signal of the A / D converter and the DC signal converted by the detection circuit unit and the control unit By comparing and amplifying the signals outputted from the APC, the DC signal, which is the actual control voltage, is supplied to the gain control part of the up-converter of the frequency upconverter so that the power of the transmission signal for the forward channel transmitted from the base station to the mobile station can be controlled. It is characterized by.

제1도는 본 발명에 의한 기지국의 송신전력 제어 회로의 블록 구성도.1 is a block diagram of a transmission power control circuit of a base station according to the present invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

1 : 주파수 상향 변환기 2 : HPA1: frequency upconverter 2: HPA

3 : 방향성 결합기 4 : BPF3: directional coupler 4: BPF

5 : 검출회로부 6 : A/D 컨버터5: detection circuit part 6: A / D converter

7 : 제어부 8 : 비교기7: control unit 8: comparator

이하, 첨부된 도면을 참고하여 본 발명에 의한 기지국의 송신전력 제어 회로의 구성 및 동작을 상세히 설명한다.Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and operation of the transmission power control circuit of the base station according to the present invention.

제1도는 본 발명에 의한 기지국의 송신전력 제어 회로의 블록 구성도로서, 기지국의 순방향 링크의 중간 주파수(IF) 신호를 송신 주파수 신호로 상향 변환하여 출력하는 주파수 상향 변환기(1)와, 상기 주파수 상향 변환기(1)에서 출력된 송신 신호의 전력을 일정 전력만큼 증폭시키는 고전력 증폭기(High Power Amplifier ; 이하, ‘HPA’라 칭함)(2)와, 상기 HPA(2)에서 증폭된 송신신호의 전력 세기를 측정하기 위해 송신신호를 커플링(Coupling)하는 방향성 결합기(3)와, 상기 방향성 결합기(3)를 통해 출력되는 송신신호의 일정 대역을 필터링하여 송신 안테나(Ant)를 통해 외부로 방사하는 대역 통과 여파기(Band Pass Filter ; 이하, ‘BPF’라 칭함)(6)와, 상기 방향성 결합기(3)에서 커플링된 송신신호를 쇼트키 다이포드(Shottkey Diode) 소자를 사용하여 DC(Direct Current) 신호로 변환하는 검출회로부(Detection Circuit)(5)와, 상기 검출회로부(5)에서 변환된 DC 신호를 디지털(Digital) 신호로 변환하는 A/D 컨버터(Analog to Digital Converter)(6)와, CPU(도시하지 않음)와 D/A 컨버터(Digital to Analog Converter)(도시하지 않음)을 포함하여 구성되어, 상기 A/D 컨버터(6)에서 변환된 디지털 신호를 이용하여 기지국에서 송신되는 순방향 채널의 송신신호에 대한 전력 레벨을 감시하고 조절하는 제어부(7)와, 상기 검출회로부(5)에서 변환된 DC 신호와 상기 제어부(7)에서 출력되는 제어신호를 비교 및 증폭하여 실제적인 제어전압인 DC 신호를 상기 주파수 상향 변환기(1)에 출력하는 비교기(8)로 구성된다.1 is a block diagram of a transmission power control circuit of a base station according to the present invention. The frequency upconverter 1 converts an intermediate frequency (IF) signal of a forward link of a base station into a transmission frequency signal and outputs the frequency upconverter (1). High power amplifier (hereinafter referred to as "HPA") 2 that amplifies the power of the transmission signal output from the up-converter 1 by a predetermined power, and the power of the transmission signal amplified by the HPA (2) In order to measure the intensity, the directional coupler 3 coupling the transmission signal and the predetermined band of the transmission signal output through the directional coupler 3 are filtered to radiate to the outside through the transmission antenna Ant. A band pass filter (hereinafter referred to as a 'BPF') 6 and a transmission signal coupled by the directional coupler 3 use a Schottky Diode element to direct current (DC). ) Turns into a signal A detection circuit section 5, an A / D converter 6 for converting the DC signal converted by the detection circuit section 5 into a digital signal, and a CPU (not shown). (Not shown) and a digital to analog converter (not shown), and a transmission signal of a forward channel transmitted from a base station using a digital signal converted by the A / D converter 6 The control unit 7 monitors and adjusts the power level of the control unit, and compares and amplifies the DC signal converted by the detection circuit unit 5 and the control signal output from the control unit 7 to obtain a DC signal as an actual control voltage. Comparator 8 outputs to the frequency up-converter (1).

상기와 같이 구성된 본 발명의 기지국의 송신전력 제어 회로의 동작을 설명하면, 먼저 HPA(2)와 BPF(4) 사이에 삽입된 방향성 결합기(3)는 HPA(2)에서 출력된 주파수 상향 변환기(L)의 송신신호를 커플링하여 상기 제어부(7)가 송신신호의 전력 레벨은 제어 및 조절할 수 있도록 송신신호의 전력은 분기시켜 준다.Referring to the operation of the transmission power control circuit of the base station of the present invention configured as described above, first, the directional coupler 3 inserted between the HPA (2) and the BPF (4) is a frequency up converter (output from the HPA (2) ( The power of the transmission signal is branched by coupling the transmission signal of L) so that the control unit 7 can control and adjust the power level of the transmission signal.

이어, 검출회로부(5)는 상기 방향성 결합기(3)로부터 커플링된 송신신호를 입력받아 쇼트키 다이오드 등과 같은 소자를 사용하여 DC 신호로 변환한다.Subsequently, the detection circuit unit 5 receives the transmission signal coupled from the directional coupler 3 and converts it into a DC signal using an element such as a Schottky diode.

이때, 필요에 따라 상기 검출회로부(5)는 공진회로를 함께 구현할 수도 있다.In this case, the detection circuit unit 5 may implement a resonance circuit as necessary.

계속해서, A/D 컨버터(6)는 상기 검출회로부(5)에서 변환된 DC 신호를 입력받아 상기 제어부(7)의 CPU가 인식할 수 있는 디지털 신호로 변환한다.Subsequently, the A / D converter 6 receives the DC signal converted by the detection circuit section 5 and converts it into a digital signal that can be recognized by the CPU of the control section 7.

그러면, 제어부(7)의 CPU는 상기 A/D 컨버터(6)의 디지털 신호를 입력받아 락-업 테이블(Rock-Up Table)과 비교하여 요구되는 값을 얻기 위한 신호를 제어부(7)내의 D/A 컨버터에 출력한다.Then, the CPU of the control unit 7 receives the digital signal of the A / D converter 6 and compares the signal with the lock-up table to obtain a required value. Output to the / A converter.

이에 따라, 상기 D/A 컨버터는 상기 신호를 DC 신호로 변환하여 비교기(8)의 트래숄드(Threshold)값을 설정한다.Accordingly, the D / A converter converts the signal into a DC signal to set a threshold value of the comparator 8.

이때, 상기 비교기(8)를 사용하지 않는 경우에는 상기 D/A 컨버터의 출력을 주파수 상향 변환기(1) 내의 DC 증폭기예 연결하여 이득 제어부를 직접 제어할 수 있도록 한다.In this case, when the comparator 8 is not used, the output of the D / A converter may be connected to a DC amplifier in the frequency up-converter 1 to directly control the gain control unit.

상기와 같이 제어부(7)로부터 트래숄드 제어 관련 제어신호를 입력받은 비교기(8)는 상기 검출회로부(5)에서 변환된 DC 신호와 상기 제어부(7)에서 출력되는 신호를 비교 및 증폭하여 실제적인 제어전압인 DC 신호를 상기 주파수 상향 변환기(1)의 업-컨버터의 이득 제어부에 공급한다.As described above, the comparator 8 receiving the control signal related to the threshold control from the control unit 7 compares and amplifies the DC signal converted by the detection circuit unit 5 and the signal output from the control unit 7 to actually perform the control. A DC signal, which is a control voltage, is supplied to the gain control unit of the up-converter of the frequency up-converter 1.

상기와 같은 본 발명에 의한 기지국의 송신전력 제어 회로는 외부로부터 미소의 전력신호를 입력받아 전력신호에 비례하는 DC 신호를 생성하고. 이 생성된 DC 신호가 각각 A/D 컨버터(6)와 비교기(8)에 입력되고 제어부(7)의 락-업 테이블의 값과 비교되어 해당되는 제어 명령 데이터값을 만들어 냄으로써 기지국에서 이동국으로 송신되는 순방향 채널에 대한 송신신호의 전력을 제어할 수 있게 된다.The transmission power control circuit of the base station according to the present invention as described above receives a small power signal from the outside and generates a DC signal proportional to the power signal. The generated DC signals are input to the A / D converter 6 and the comparator 8, respectively, and are compared with the values of the lock-up table of the control unit 7 to generate corresponding control command data values, which are transmitted from the base station to the mobile station. It is possible to control the power of the transmission signal for the forward channel.

이상, 상기 설명에서와 같이 본 발명은 기지국에서의 순방향 채널에 대한 송신신호의 전력을 동적으로 측정 및 제어함으로써 기지국의 인접 셀로부터의 간섭을 최소화하여 균일한 통화 품질을 유지할 우 있게 되는 효과가 있다.As described above, the present invention has the effect of maintaining uniform call quality by minimizing interference from adjacent cells of the base station by dynamically measuring and controlling the power of the transmission signal for the forward channel at the base station. .

Claims (1)

기지국의 순방향 링크의 중간 주파수 신호를 송신 주파수 신호로 상향 변환하여 출력하는 주파수 상향 변환기(1)와, 상기 주파수 상향 변환기(1)에서 출력된 송신신호의 전력을 일정 전력만큼 증폭시키는 HPA(2)와, 상기 HPA(2)에서 증폭된 송신신호의 전력 세기를 측정하기 위해 송신신호를 커플링하는 방향성 결합기(3)와, 상기 방향성 결합기(3)를 통해 출력되는 송신신호의 일정 대역을 필터링하여 송신 안테나(Ant)를 통해 외부로 방사하는 BPF(4)와, 상기 방향성 결합기(3)에서 커플링된 송신신호를 쇼트키 다이오드 소자를 사용하여 DC 신호로 변환하는 검출회로부(5)와, 상기 검출회로부(5)에서 변환된 DC 신호를 디지털 신호로 변환하는 A/D 컨버터(6)와, CPU와 D/A 컨버터를 포함하여 구성되어, 상기 A/D 컨버터(6)에서 변환된 디지털 신호를 이용하여 기지국에서 송신되는 순방향 채널의 송신신호에 대한 전력 레벨을 감시하고 조절하는 제어부(1)와, 상기 검출회로부(5)에서 변환된 DC 신호와 상기 제어부(7)에서 출력되는 제어신호를 비교 및 증폭하여 실제적인 제어 전압인 DC 신호를 상기 주파수 상향 변환기(1)에 출력하는 비교기(8)로 구성되는 것을 특징으로 하는 기지국의 송신전력 제어 회로.A frequency upconverter 1 for upconverting and outputting an intermediate frequency signal of a forward link of a base station into a transmission frequency signal, and an HPA 2 for amplifying a power of a transmission signal output from the frequency upconverter 1 by a predetermined power; And a directional coupler 3 coupling the transmission signal to measure the power strength of the transmission signal amplified by the HPA 2 and filtering a predetermined band of the transmission signal output through the directional coupler 3. A BPF (4) radiating out through a transmission antenna (Ant), a detection circuit section (5) for converting a transmission signal coupled by the directional coupler (3) into a DC signal using a Schottky diode element, and A / D converter 6 for converting the DC signal converted by the detection circuit section 5 into a digital signal, and a digital signal converted by the A / D converter 6 including a CPU and a D / A converter At the base station using The control unit 1 monitors and adjusts the power level of the transmitted forward channel transmission signal, and compares and amplifies the DC signal converted by the detection circuit unit 5 and the control signal output from the control unit 7. And a comparator (8) for outputting a DC signal which is an ordinary control voltage to the frequency up-converter (1).
KR1019970026758A 1997-06-24 1997-06-24 Transmitting power control circuit of base station KR100255307B1 (en)

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
KR100396777B1 (en) * 2001-06-08 2003-09-02 엘지전자 주식회사 Output power controlling circuit

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KR100324426B1 (en) * 2000-01-14 2002-02-27 박종섭 Method for changing automatically transmission power of three sector basestation transceiver subsystem in mobile communication system
KR20020071417A (en) * 2001-03-06 2002-09-12 정영교 Transmission power control system and method for a mobile communication system
KR100446742B1 (en) * 2001-12-24 2004-09-01 엘지전자 주식회사 Tx power automatic control apparatus for frequency up converter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100396777B1 (en) * 2001-06-08 2003-09-02 엘지전자 주식회사 Output power controlling circuit

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