KR20000074034A - Ultra-slim Repeater with Variable Attenuator - Google Patents
Ultra-slim Repeater with Variable Attenuator Download PDFInfo
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- KR20000074034A KR20000074034A KR1019990017686A KR19990017686A KR20000074034A KR 20000074034 A KR20000074034 A KR 20000074034A KR 1019990017686 A KR1019990017686 A KR 1019990017686A KR 19990017686 A KR19990017686 A KR 19990017686A KR 20000074034 A KR20000074034 A KR 20000074034A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15528—Control of operation parameters of a relay station to exploit the physical medium
- H04B7/15535—Control of relay amplifier gain
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15507—Relay station based processing for cell extension or control of coverage area
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15564—Relay station antennae loop interference reduction
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
Description
본 발명은 초소형 중계기에 관한 것으로서, 좀 더 자세하게는 설치가 간단해지고 부스터(booster) 내에 가변형 감쇄기(variable attenuator)를 포함시켜 케이블 손실 보상이 가능하도록 한 초소형 중계기에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a miniature repeater, and more particularly, to a miniature repeater which is simple to install and includes a variable attenuator in a booster to enable cable loss compensation.
현재 셀룰라 및 개인 휴대 통신 등의 각종 이동통신 서비스의 가입자수가 폭발적으로 증가하면서 이에 따른 해당 서비스 영역의 확장과 전파음영지역 해소에 대한 요구가 크게 증가되고 있는 실정이다. 이에 각 통신 사업자들은 해당 서비스지역과 음영지역에 추가로 기지국을 건설하거나 중계기를 설치하여 이를 해결하고자 노력하고 있으나 빌딩내부나 지하공간과 같은 소규모 음영지역에 대해서는 효과적인 서비스를 제공하기 위하여 차별화된 다수의 초소형 중계기를 해당 전파음영지역에 설치하고 있는 추세이다.As the number of subscribers of various mobile communication services such as cellular and personal mobile communication has exploded, there is an increasing demand for the expansion of the corresponding service area and the elimination of radio shade areas. Accordingly, each service provider is trying to solve this by constructing an additional base station or installing a repeater in the corresponding service area and shadow area, but in order to provide effective services for small shadow areas such as inside buildings or underground spaces, Miniature repeaters are being installed in the radio shade areas.
도1은 상기와 같은 목적을 위한 종래 기술에 따른 일반적인 초소형 중계기의 구성을 보여주는 블록도이다. 제 1 안테나(12)를 통해 기지국(11)과의 신호를 주고받는 업다운 컨버터(13)는 케이블(14)을 통해 부스터(17)와 연결이 되고, 전파음영지역 내에 설치된 부스터는 제 2 안테나(18)를 통해 가입자(19)와 신호를 주고받는다. 따라서, 전파음영지역 내에 있는 가입자와 기지국 시스템간의 통화가 초소형 중계기를 통해 가능하게 되는 것이다. 상기 시스템 구성에 있어서 부스터(17)는 케이블을 통해 상기 업다운 컨버터의 출력신호를 받아 이를 입력신호로 하는 다운링크(downlink) 증폭단(15)과 제 2 안테나를 통해 입력되는 단말기 송신신호를 입력신호로 하는 업링크(uplink) 증폭단(16)을 포함하고 신호레벨에 상관없이 소정의 이득을 갖도록 증폭한다.Figure 1 is a block diagram showing the configuration of a general miniature repeater according to the prior art for the above purpose. The up-down converter 13 which exchanges a signal with the base station 11 through the first antenna 12 is connected to the booster 17 through a cable 14, and the booster installed in the radio shade area is a second antenna ( 18) to communicate with the subscriber (19). Therefore, the call between the subscriber and the base station system in the radio shading area is made possible through the micro repeater. In the system configuration, the booster 17 receives an output signal of the up-down converter through a cable and uses a downlink amplifying stage 15 that receives the output signal as an input signal and a terminal transmission signal input through a second antenna as an input signal. And an uplink amplifier stage 16 to amplify to have a predetermined gain regardless of the signal level.
이와 같은 구성을 갖는 초소형 중계기는 상기 업다운 컨버터(13)로부터 부스터(17)로 입력되는 신호세기가 케이블(14)을 거치면서 케이블 손실에 의해 감소한다고 하는 문제점이 있었다. 이를 해결하기 위해 상기 케이블(14)에 의한 손실을 감안하여 업다운 컨버터에서 신호를 더 크게 증폭하고 케이블(14)을 통해 부스터로 전송하는 경우 부스터내에 구비된 다운링크 증폭단(15)이 비선형성을 갖게 되어 그출력단에 다수의 불요파가 발생한다고 하는 또다른 문제점이 있었다. 또한, 상기 도1에 따른 구성대로 초소형 중계기를 설치하기 위해서는 제 1 안테나(12)와 제 2 안테나(18)를 각 구조물에 따로 설치해야 하는데 이는 설치가 쉽지 않을 뿐만 아니라 비경제적이다.The micro repeater having such a configuration has a problem that the signal strength input from the up-down converter 13 to the booster 17 decreases due to cable loss while passing through the cable 14. In order to solve this problem, the downlink amplifier stage 15 provided in the booster has a non-linearity when the signal is amplified in the up-down converter and transmitted to the booster through the cable 14 in consideration of the loss caused by the cable 14. There was another problem that a large number of unwanted waves were generated at the output stage. In addition, in order to install a miniature repeater as shown in FIG. 1, the first antenna 12 and the second antenna 18 must be separately installed in each structure, which is not only easy to install but also uneconomical.
따라서, 본 발명은 상기와 같은 문제점들을 해결하기 위해 기지국과 신호를 주고받는 제 1 안테나와 업다운 컨버터를 하나의 모듈로 일체화하고, 가입자와 신호를 주고받는 제 2 안테나와 부스터를 또다른 모듈로 일체화하여 설치가 용이해지도록 하고, 케이블에 의한 손실을 감안하여 업다운 컨버터에서 신호전력을 소정 크기만큼 높여 부스터로 전송하고 부스터내의 증폭회로 전단에 가변형 감쇠기(variable attenuator)를 구비하여 증폭회로로 높은 신호전력이 입력되는 것을 방지하도록 한 케이블 손실 보상이 가능한 초소형 중계기를 제공함을 그 기술적 과제로 한다.Therefore, in order to solve the above problems, the present invention integrates the first antenna and up-down converter, which communicate with the base station, into one module, and the second antenna and booster, which communicate with the subscriber, into another module. Easy to install, and considering the loss caused by the cable, the up-down converter increases the signal power by a certain amount and transmits it to the booster, and has a variable attenuator in front of the amplification circuit in the booster to provide high signal power It is a technical object of the present invention to provide a miniature repeater capable of compensating for cable loss to prevent the input from being input.
또한, 본 발명은 상기 부스터를 다수 구비함으로써 전력 분배기를 이용하여 신호를 분배하여 빌딩과 같이 일정 공간에 소규모 음영지역이 다수 존재하는 경우에도 효율적으로 이를 해소할 수 있는 효과를 갖는 케이블 손실 보상이 가능한 초소형 중계기를 제공함을 또다른 기술적 과제로 한다.In addition, the present invention is provided by a plurality of boosters to distribute the signal by using a power divider, even if there are a large number of small shadow areas in a certain space, such as a building, it is possible to compensate for cable loss having the effect that can be effectively solved It is another technical problem to provide a micro repeater.
도1은 종래 기술에 따른 일반적인 초소형 중계기의 구성을 보여주는 블록도.1 is a block diagram showing the configuration of a general miniature repeater according to the prior art.
도2는 본 발명에 따른 케이블 손실 보상이 가능한 초소형 중계기의 일실시예의 구성을 나타내는 블록도.Figure 2 is a block diagram showing the configuration of one embodiment of a micro repeater capable of cable loss compensation according to the present invention.
도3은 본 발명에 따른 케이블 손실 보상이 가능한 초소형 중계기의 바이어스-티의 구성도.3 is a configuration diagram of a bias-tee of a micro repeater capable of compensating for cable loss according to the present invention.
도4는 본 발명에 따른 케이블 손실 보상이 가능한 초소형 중계기의 또다른 일실시예의 구성을 나타내는 블록도.Figure 4 is a block diagram showing the configuration of another embodiment of a micro repeater capable of cable loss compensation according to the present invention.
< 도면의 주요 부분에 대한 부호의 설명 ><Description of Symbols for Main Parts of Drawings>
11, 21, 41. 기지국 12, 22. 제 1 안테나11, 21, 41. Base station 12, 22. First antenna
13, 23. 업다운 컨버터 14, 25, 43. 케이블13, 23.Up-down converter 14, 25, 43. Cable
15, 29. 다운링크 증폭단 16, 30. 업링크 증폭단15, 29. Downlink amplifier stage 16, 30. Uplink amplifier stage
17, 31. 부스터 18, 32. 제 2 안테나17, 31. Boosters 18, 32. Second antenna
19, 34. 단말기 24, 42. 제 1 모듈19, 34. Terminals 24, 42. First module
26, 44. 바이어스-티(bias tee) 27, 45. AC-DC 컨버터26, 44. Bias tee 27, 45. AC-DC converter
28. 가변형 감쇄기 33, 47, 48. 제 2 모듈28. Variable Attenuator 33, 47, 48. Second Module
46. 분배기46. Splitter
상기 목적을 달성하기 위해 본 발명에 따른 케이블 손실 보상이 가능한 초소형 중계기는 제 1 안테나(22)와 업다운 컨버터(23)가 일체화되어 하나의 모듈로 된 제 1 모듈(24); 다운링크 증폭단(29) 전단에 가변형 감쇄기(28)가 연결된 부스터(31)와 제 2 안테나(32)를 일체화하여 하나의 모듈로 된 제 2 모듈(33);및 상기 제1 모듈(24)과 제 2 모듈(33)을 전기적으로 연결하는 케이블(25)을 포함한다.In order to achieve the above object, the ultra-compact repeater capable of cable loss compensation according to the present invention includes a first module 24 having a first antenna 22 and an up-down converter 23 integrated into one module; A second module 33 in one module by integrating the booster 31 and the second antenna 32 connected to the variable attenuator 28 in front of the downlink amplifier stage 29; and the first module 24 and And a cable 25 for electrically connecting the second module 33.
이하 첨부하는 도면에 따라 각부 특성 및 동작원리를 상세히 설명한다. 도 2는 본 발명에 따른 케이블 손실 보상이 가능한 초소형 중계기의 일실시예의 구성을 나타내는 블록도이다. 제 1 모듈(24)은 업다운 컨버터(23)와 제 1 안테나(22)로 구성되는데 업다운 컨버터는 제 1 안테나를 통해 기지국(21)과 신호를 주고받으며 입력된 신호를 저잡음으로 증폭하고 잡음을 제거하기 위해 낮은 주파수로 변환한후 소정의 이득을 갖도록 증폭한 후에 다시 원래 입력신호의 주파수로 변환하여 높은 전력으로 증폭 출력한다. 상기 작용으로 알 수 있는 바와 같이 업다운 컨버터는 양방향성을 갖는다.Hereinafter, the characteristics and operation principles of each part will be described in detail with reference to the accompanying drawings. Figure 2 is a block diagram showing the configuration of an embodiment of a miniature repeater capable of cable loss compensation according to the present invention. The first module 24 is composed of an up-down converter 23 and a first antenna 22. The up-down converter exchanges signals with the base station 21 through the first antenna and amplifies the input signal with low noise and removes noise. In order to convert the signal to a low frequency, the amplifier amplifies to have a predetermined gain, and then converts the signal to a frequency of the original input signal. As can be seen from the above action, the up-down converter has bidirectionality.
전파음영지역에 설치되는 제 2 모듈(33)은 제 2 안테나(32)와 부스터(31)로 구성되는데 부스터는 제 2 안테나를 통해 가입자의 단말기(34)와 신호를 주고받으며 다운링크 증폭단(29)과 업링크 증폭단(30) 그리고 다운링크 증폭단 전단에 연결된 가변형 감쇠기(28)를 포함하는데, 상기 가변형 감쇠기(variable attenuator) (28)는 상기 제 1 모듈과 제 2 모듈을 연결하는 케이블(25)에 의한 손실을 감안하여 상기 제1 모듈(24)의 업다운 컨버터(23)에서 신호전력을 소정 크기만큼 높여 상기 제 2 모듈(33)의 부스터(31)로 전송하고 부스터내의 증폭회로 전단에 상기 가변형 감쇠기(28)를 구비하여 증폭회로로 높은 신호전력이 입력되는 것을 방지하도록 한 것이다.The second module 33 installed in the radio shade area is composed of a second antenna 32 and a booster 31, the booster exchanges signals with the subscriber terminal 34 through the second antenna and the downlink amplifier stage 29 ) And a variable attenuator 28 connected to the uplink amplifier stage 30 and the downlink amplifier stage front end, wherein the variable attenuator 28 is a cable 25 connecting the first module and the second module. In consideration of the loss caused by the up-down converter 23 of the first module 24, the signal power is increased by a predetermined amount and transmitted to the booster 31 of the second module 33, and the variable type is placed in front of the amplification circuit in the booster. The attenuator 28 is provided to prevent high signal power from being input into the amplifying circuit.
이와같은 구성은 상기 업다운 컨버터(23)에서 소정의 크기만큼 높여 출력되는 신호전력이 다운링크 증폭단(29)에 입력될 때 증폭회로가 비선형성이 될 경우 그 출력단에 다수의 불요파가 발생하게 되므로 이를 미연에 방지하기 위해 가변형 감쇠기(28)를 구비하여 적정한 레벨로 감쇠시킴으로써 케이블 손실 보상이 원활하게 이루어지도록 하는 기능을 한다.In this configuration, when the amplification circuit becomes nonlinear when the signal power output by increasing the predetermined amount by the up-down converter 23 is input to the downlink amplifier stage 29, a large number of unnecessary waves are generated at the output stage. In order to prevent this in advance, the variable attenuator 28 is provided to attenuate to an appropriate level so that the cable loss compensation can be performed smoothly.
도3은 본 발명에 따른 케이블 손실 보상이 가능한 초소형 중계기의 바이어스-티의 구성도를 나타낸다. 도3에서 무선(RF) 신호 경로는 양방향성을 가지므로 RF in으로부터 RF out으로, 또는 RF out으로부터 RF in으로 전달되며 전원(DC) 경로로 유입된 무선(RF) 신호성분은 인덕터 L1과 L2에 의해 차단된다. 이와는 달리 전원(DC) 경로는 DC in에 인가되어 인덕터 L1과 L2를 통과하여 RF in과 RF out으로 전달된다. 도3에서 RF in과 RF out에는 각각 상기 제 1 모듈(24)과 제 2 모듈(33)이 접속된다. 따라서, 상기와 같은 원리에 의해 하나의 케이블로 무선(RF) 신호와 전원(DC) 신호가 전달되므로 전원 공급은 전원선을 별도로 하지 않고 상기 케이블(25) 중간에 바이어스-티(bias tee)(26)와 AC-DC 컨버터(27)를 구비하여 공급한다.Figure 3 shows the configuration of the bias-tee of the miniature repeater capable of cable loss compensation according to the present invention. In Figure 3, the radio (RF) signal path is bidirectional, so the radio (RF) signal components transferred from RF in to RF out or from RF out to RF in and into the power (DC) path are inductors L 1 and L. Blocked by 2 In contrast, a power supply (DC) path is applied to DC in and passes through inductors L 1 and L 2 to RF in and RF out. In FIG. 3, the first module 24 and the second module 33 are connected to RF in and RF out, respectively. Therefore, according to the principle described above, since a radio (RF) signal and a power (DC) signal are transmitted through a single cable, a power supply is a bias tee (middle) in the middle of the cable 25 without a separate power line. 26) and an AC-DC converter 27 for supply.
도4는 본 발명에 따른 케이블 손실 보상이 가능한 초소형 중계기의 또다른 일실시예의 구성을 나타내는 블록도이다. 도4에서는 상기 도2의 일실시예를 좀 더 확장한 것으로서 바이어스-티(44)의 다음 단에 N-분기 전력 분배기(46)를 연결하여 상기 제 2 모듈(47, 48)을 다수 구비함으로써 동일한 신호를 N-분기로 분배하여 빌딩과 같이 일정 공간에 소규모 음영지역이 다수 존재하는 경우에도 효율적으로 이를 해소할 수 있다. 이러한 경우에 있어서도 상기 가변형 감쇠기(28)는 각각의 제2 모듈(47, 48)에 구비되어 있으므로 각 모듈마다 감쇠량을 적절하게 조정하는 것이 가능하다.Figure 4 is a block diagram showing the configuration of another embodiment of a compact repeater capable of cable loss compensation according to the present invention. In FIG. 4, the embodiment of FIG. 2 is further expanded, and a plurality of second modules 47 and 48 are provided by connecting an N-branch power divider 46 to the next stage of the bias-tee 44. By distributing the same signal to N-branches, even if there are many small shadow areas in a certain space such as a building, it can be effectively solved. Also in this case, since the variable damper 28 is provided in each of the second modules 47 and 48, it is possible to appropriately adjust the amount of attenuation for each module.
또한, 상기 도2와 도4에 도시된 제 2 모듈(33, 47, 48)은 도3에서 기술한 바와 같이 별도의 전원선을 필요로 하지 않으므로 해당 음영지역의 환경을 고려하여 옥내 또는 옥외에 모두 설치할 수 있다고 하는 또다른 장점을 가진다.In addition, since the second modules 33, 47, and 48 shown in FIG. 2 and FIG. 4 do not require a separate power line as described in FIG. All have the added advantage of being able to install.
소규모 음영지역에 설치되는 초소형 중계기에 있어서 종래에는 통상 업다운 컨버터(updown converter)를 포함하는 부분과 부스터(booster)를 포함하는 부분으로 구성되어 각 구조물의 외부에 안테나를 별도로 구성해야 하므로 설치가 어렵고, 상기 업다운 컨버터와 부스터를 연결하는 케이블의 손실에 의해 신호전력이 감소된 다고 하는 문제점이 있었다.In a small repeater installed in a small shadow area, it is conventionally composed of a part including an updown converter and a part including a booster, and thus it is difficult to install because the antenna must be separately configured outside of each structure. There is a problem that the signal power is reduced by the loss of the cable connecting the up-down converter and the booster.
본 발명은 상기와 같은 문제점들을 해결하기 위해 안출된 것으로 기지국과 신호를 주고받는 제 1 안테나와 업다운 컨버터를 하나의 모듈로 일체화하고, 가입자와 신호를 주고받는 제 2 안테나와 부스터를 또다른 모듈로 일체화하여 설치가 용이해지도록 하고, 케이블에 의한 손실을 감안하여 업다운 컨버터에서 신호전력을 소정 크기만큼 높여 부스터로 전송하고 부스터내의 증폭회로 전단에 가변형 감쇠기(variable attenuator)를 구비하여 증폭회로로 높은 신호전력이 입력되는 것을 방지하도록 한 케이블 손실 보상이 가능한 초소형 중계기를 제공한다.In order to solve the above problems, the present invention integrates a first antenna and an up-down converter that communicate with a base station into one module, and a second antenna and a booster that communicate with a subscriber to another module. Integrate to facilitate installation. In consideration of the loss caused by the cable, the up-down converter increases the signal power by a certain amount and transmits the signal to the booster. It offers an ultra-compact repeater with cable loss compensation to prevent power input.
또한, 본 발명은 상기 부스터를 다수 구비하고 전력 분배기를 이용하여 신호를 분배함으로써 빌딩과 같이 일정 공간에 소규모 음영지역이 다수 존재하는 경우에도 효율적으로 이를 해소할 수 있는 효과를 갖는다.In addition, the present invention is provided with a plurality of boosters and by using a power divider to distribute the signal has an effect that can be effectively solved even when there are a large number of small shadow areas in a certain space, such as a building.
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