KR102308249B1 - Multi Channel-Distributed Antenna System comprising 5G converter Unit - Google Patents

Abstract

The present invention provides an apparatus and method for converting a 5G signal to a frequency within 6 GHz that can be transmitted to the MC-DAS, as well as gain control of the MC-DAS (Multi Channel-Distributed Antenna System) signal and a web-based screen analyzer (Web Based Screen Analyzer) It is to provide an MC-DAS device and method including IMD check function and One Click Install function.
In addition, the present invention provides a method for easily converting a 5G signal to a frequency within 6 GHz in order to realize miniaturization and low price.

Description

Multi Channel-Distributed Antenna System comprising 5G converter Unit

It relates to a Multi Channel-Distributed Antenna System equipped with a 5G converter unit, and more particularly, to an MC-DAS using a method of converting a 5G frequency signal band into a specific frequency signal band.

The role of transmitting BTS signals such as “Distributed Antenna System Supporting Multi Band” in Patent Registration No. 10-1463239 to the terminal through the MC-DAS and the signal received by the terminal through the DAS It performs the role of delivering to BTS.

To a conversion device and method for connecting a 5G (5th generation) signal input from a BTS with an existing MC-DAS. In more detail, 5G is impossible to use in the existing MC-DAS without converting microwave (3~30GHz) and millimeter (30~300GHz) signals. It converts a signal within 6GHz that can be used for MC-DAS and restores it to a 5G signal at a remote location connected through Optic or Ethernet so that it can be transmitted through an antenna. The POI is converted to a frequency band and connected through a transmission medium such as optical or UTP (unshielded twisted pair cable), which is restored to a 5G signal and transmitted to the BTS.

It is necessary to obtain a frequency sweep of the unassigned band of the existing installed MC-DAS, receive modem information, and user usage information, perform frequency conversion based on this, and connect it to the existing MC-DAS.

In addition, as traffic is expected to increase explosively with 5G (5th generation) technology, 5G technology will increase traffic more than tens of times compared to 3G and 4G technologies. In order to accommodate the 5G bandwidth with explosively increasing traffic in the existing MC-DAS, a conversion device needs a device for efficiently converting a wide bandwidth.

The present invention is derived from research conducted as part of the Global Small and Small Enterprise Project of the Small and Medium Business Administration.

[Project number: S2425674 Project name: Multi Channel DAS and Low Delay ICS Repeater]

Efforts to develop a 5G communication system are being actively made to meet the increasing demand for data traffic after the commercialization of 1G~4G communication services.

For this reason, in order to increase the data rate of the 5G communication system, the use of a microwave frequency band and a millimeter frequency band is essential for the 5G communication system. 5G communication technology is actively developing and discussing multiple input/output (Massive MIMO, Full Dimension MIMO) technologies and various antenna technologies in order to alleviate the path loss of radio waves and increase the radio wave reach.

In addition, in the 5G communication system, small cell, femtocell, cloud radio access network (cloud RAN), and wireless backhaul network technologies are being developed.

Based on this, we are actively discussing how to provide services by integrating both 5G and 4G technologies.

In the MC-DAS, the signal (DL: Down Link) transmitted from the BTS (Base Transceiver Station) is attenuated by the urban structure. It is installed in places where direct transmission is difficult due to attenuation of radio waves, such as shopping malls, large buildings, campuses, stadiums, hospitals, and tunnels, and amplifies and transmits signals. It also performs the function of transmitting to the BTS through the transmission medium.

Microwave or millimeter wave is an electromagnetic wave with a frequency band of 3 GHz to 300 GHz, and uses a wider and higher frequency band than the currently used band within 6 GHz. This makes it possible to transmit large amounts of data. Therefore, it is a very important technology at the present time of technology using microwave or millimeter wave in order to realize an environment in which high quality communication is possible in connection with a transmission medium using optical fiber or UTP.

However, the existing MC-DAS cannot directly accommodate the ultra-high frequency 5G signal ranging from 3GHz to 300GHz. In order to solve this problem, the need for a device for converting 5G signals to a frequency band within 6GHz that can be input to the existing MC-DAS has emerged.

In order to use 5G signal for MC-DAS, downlink performs down conversion to frequency within 6GHz and transmits it to POI, and remote unit (RU) performs up conversion of frequency within 6GHz. It must be converted into a 5G signal through

In the uplink, as opposed to the downlink, down conversion is performed in the RU, and up conversion is performed in the POI to connect to the BTS.

In the conventional MC-DAS, in order to service a 5G signal in a structure in which various frequencies and various bandwidths are input and output, a device that can clearly determine the bandwidth and frequency information used in the 5G signal must be provided, and down-conversion ( The down-conversion signal should be provided with a frequency synthesizer that can be used in a wide band and a filter suitable for it so that the service of the same bandwidth as the 5G signal can be used to solve the problem of preventing unnecessary signals from being introduced.

Republic of Korea Patent Publication No. 10-2015-0054651 Republic of Korea Patent No. 10-1463239

The present invention provides an apparatus and method for converting a 5G signal to a frequency within 6 GHz that can be transmitted to the MC-DAS, as well as gain control of the MC-DAS signal and a Web Based Screen Analyzer and IMD check function, An object of the present invention is to provide an apparatus and method for MC-DAS including a One Click Install function.

Another object of the present invention is to provide a method for easily converting a 5G signal to a frequency within 6 GHz in order to realize miniaturization and low price.

The objects and advantages of the present invention can be understood by the following description, and can be seen more clearly by the examples of the present invention. It will be readily understood that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

In order to achieve the above objects, the 5G Converter Unit (5CU) of the MC-DAS according to the present invention transmits the DL (Downlink)/UL (Uplink) signal input from the BTS/BDA (Base Transceiver Station) to the previously installed MC-DAS. As a 5CU (5G Converter Unit) that appropriately uses Variable Attenuator, Switch, PLL, Mixer, Filter, AMP, etc. to convert to a frequency band suitable for a duplexer directly connected to the service antenna port or a band pass filter (BPF) directly connected to the TDD BTS service antenna port; a hybrid coupler for DL and UL that can be connected even when DL and UL signals exist separately when connected to TDD BTS; RF switches for DL and UL that can be connected even when DL and UL signals exist separately when connected to TDD BTS; a frequency synthesizer that exists on the DL path and enables the signal to be used in the MC-DAS with a frequency within 6GHz; a frequency synthesizer that exists on the UL path and allows frequencies within 6GHz to be used for 5G frequencies; A phase lock loop (PLL) that exists on the L/UL path and supplies the local signal to the frequency synthesizer, a filter that passes the PLL signal through an appropriate signal band, and a frequency multiplier that can be used by multiplying the supplied frequency band Wow; a fixed attenuator that reduces the high-output DL signal input from the BTS to an appropriate level so as not to damage a device at the rear end; Digital Step Variable Attenuator or Analog Attenuator which exists on the DL path and UL path, respectively, and plays a role of adjusting the appropriate level; a DL Amplifier existing on the DL path and amplifying to an appropriate level; Monitoring the level of the DL signal input from the BTS, monitoring the level of the UL signal input through the CHC, and using the input/output level monitoring information to appropriately control the input and the gain and output of the received signal to the BTS. It is characterized in that it is made including 5CU (5G Converter Unit).

Here, the 5CU is positioned between the 5G-BTS and the POI, and the input 5G downlink signal is converted to a frequency within 6 GHz usable for the MC-DAS, and the uplink input through the CHC is a 5G signal. It is characterized in that it is converted to

In addition, the 5CU is characterized in that it is implemented by including it in the POI. In addition, the 5CU is located equally in the RM and OECDU, so that the downlink input through the optical fiber converts the MC-DAS signal back to the 5G signal, and the 5G uplink signal input through the RM is the RM It features a structure that converts to a frequency within 6GHz that can be used in MC-DAS through the In addition, the 5CU is characterized in that it is implemented by being included in the RM.

In addition, the channel combination divider (CHC) is configured based on the number of inputs and outputs of 8:8, and includes having the number of inputs and outputs of N:N as needed, and a variable attenuator for varying the signal level (Level) Variable Attenuator) and an amplifier, characterized in that it includes a detector (Detector) for detecting all signal levels input to the CHC. In addition, the CHC includes a function of setting a specific level or ratio based on the detected information, and provides an auto-install function to enable automatic product installation in consideration of user convenience.

In addition, the MCU (Main Controller Unit) is characterized in that a user can directly access through a user control screen and download firmware. In addition, the MCU (Main Controller Unit) can communicate with POI, CHC, and 5CU, and the user can check and control the status of POI, CHC, and 5CU through the user control screen connected to the MC-DAS (Distributed Antenna System). characterized. In addition, the MCU (Main Controller Unit) is characterized in that it is possible to protect the quality of service of the BTS and the 5CU, POI, and CHC from input and output levels in ALC (Auto Level Control) and AGC (Auto Gain Control) functions. In the communication method, the MCU (Main Controller Unit) can use a serial communication method including RS485 and various communication methods including Ethernet, RF modem (Modem), and Bluetooth (Bluetooth). In addition, the MCU (Main Controller Unit) is physically distant from the MC-DAS (Distributed Antenna System), so even in a remote location where a GUI cannot be directly connected, Ethernet, RF Modem, Bluetooth It is characterized in that it is possible to check and control the status of a Web-GUI (Graphic User Interface), a Mobile Web-GUI (Graphic User Interface) including

According to the present invention, the following effects can be obtained.

First, 5G DAS is not installed separately by using 5CU, but is connected to the existing MC-DAS, so it has the effect of reducing installation cost and operating cost and increasing operation and management efficiency.

Second, the web-based screen analyzer that can optimize all signal bands input to the MC-DAS and the IMD check and path abnormality function make it easy to determine whether there is a fault, and one-click With the One Click Install Function that can be installed, it is easy to install additional modules during initial installation and expansion, thereby increasing the efficiency of operation.

Third, it supports both wired connection and wireless connection with wearable devices to perform device setup and remote download, and to check the log and alarm status of the installed product at once. Operation efficiency can be maximized.

1 is a connection configuration between BTS and MC-DAS, and a configuration diagram using a 5G Converter Unit.
2 is a diagram showing the configuration and signal flow of Downlink 5G Converter Unit detailed functional blocks in the connection configuration between the BTS and the MC-DAS according to an embodiment of the present invention;
3 is a diagram showing the configuration and signal flow of Uplink 5G Converter Unit detailed functional blocks in the connection configuration between the MC-DAS and the BTS according to an embodiment of the present invention;
4 is a block diagram of a channel combiner (CHC) according to an embodiment of the present invention;
5 is a configuration diagram of a POI (Point of Interface) according to an embodiment of the present invention;
6 is a diagram showing the configuration and signal flow of the Web-Based Screen Capture Function 307 detailed functional blocks according to an embodiment of the present invention;
7 is a configuration diagram of a HE (Headend Unit) configuration and signal flow according to an embodiment of the present invention;
8 is a configuration diagram of a remote unit (RU) configuration and signal flow according to an embodiment of the present invention;
9 is a signal flow and configuration diagram of a remote module (RM) according to an embodiment of the present invention;

Hereinafter, with reference to the accompanying drawings, the present invention will be described in detail so that those of ordinary skill in the art can easily carry out the present invention. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein.

The terminology used herein is for the purpose of describing the embodiments and is not intended to limit the present invention. As used herein, the singular also includes the plural unless specifically stated otherwise in the phrase.

As used herein, “comprises”, “comprising” refers to the presence or absence of one or more other components, steps, operations and/or elements mentioned addition is not excluded.

In addition, terms including ordinal numbers such as first, second, etc. used in the present invention may be used to describe the components, but the components should not be limited by the terms. These terms are used only for the purpose of distinguishing one component from another. In addition, in the description of the present invention, if it is determined that a detailed description of a related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

In addition, the components shown in the embodiment of the present invention are shown independently to represent different characteristic functions, and it does not mean that each component is composed of separate hardware or a single software component. That is, each component is listed as each component for convenience of description, and at least two components of each component are combined to form one component, or one component can be divided into a plurality of components to perform a function. Integrated embodiments and separate embodiments of each of these components are also included in the scope of the present invention without departing from the essence of the present invention.

Hereinafter, an embodiment according to the present invention will be described in detail with reference to the accompanying drawings. The configuration of the present invention and the effects thereof will be clearly understood through the following detailed description.

1 shows a conventional connection configuration between BTSs 101, 102, 103, and 104 and an MC-DAS 001, so that a 5G ultra-high frequency broadband service cannot be directly connected to the existing MC-DAS. To solve this problem, 5CU (5G Converter Unit, 105) was placed between 5G-BTS(103) and 5G-POI(108), and between OECDU(Optic Electrical Combiner Divider Unit)(112) and 5G RM(116). 5C (5G Converter Unit, 113) was placed so that 5G service was possible.

FIG. 2 is a diagram expressing the DL signal flow configuration of the 5CU 105 in detail, and the DL signal is a fixed attenuator 1051 to attenuate the signal input from the 5G-BTS 103. 1051 transmits a signal to the mixer 1052 by attenuating the specified attenuation amount. A mixer 1052 through a filter 1057 that generates a desired fixed signal in the PLL 1059 and creates a desired multiplication signal through the frequency multiplier 1058 or passes only the desired signal without going through the frequency multiplier 1058 ) is sent to The mixer 1052 synthesizes the attenuated signal of the fixed attenuator 1051 and a phase lock loop (PLL) signal input through the filter 1057 to create an appropriate signal level through a Variable Attenuator 1053 and filter The signal is amplified by removing the PLL and spurious waves through 1054 and passing it to the amplifier 1055 . The amplified signal is passed through the signal detector 1056 to the POI 108 .

3 is a diagram illustrating in detail the configuration of the 5CU (105) UL signal flow, and the UL signal is input to the mixer 1062 by amplifying the signal input through the POI 108 with the amplifier 1061.

The PLL 1059 generates a desired fixed signal, and the desired multiplier signal is generated through the frequency multiplier 1058, or the mixer 1062 through the filter 1057 that passes only the signal without going through the frequency multiplier 1058. send to The mixer 1062 synthesizes the signal of the amplifier 1061 and the filtered (1057) fixed frequency signal, generates a 5G signal, and appropriately attenuates the signal with a variable attenuator (1063) to pass only the 5G signal band. It goes through a filter 1064 . The signal passing through the filter 1064 is amplified through an amplifier 1065 to transmit to an appropriate signal level, and the amplified signal is transmitted to the 5G-BTS 103 through a signal detector 1066.

The POIs 106, 107, 108, and 109 shown in FIG. 4 support different service bands and are connected to the BTSs 101, 102, 104 or 5CU 105 for different carriers to distinguish between DL and UL signals. A signal is transmitted to the duplexer (Duplexer) 201 .

By attenuating the high-output input signal input from the BTS (101, 102, 104) to an appropriate level, the signal is transmitted to a fixed attenuator (Fixed Attenuator) 202, which serves to prevent damage to the device following the attenuation and appropriate An input detector that serves to make a signal level, detect the level of the DL signal input from the BTS 101, 102, 104, and transmit the detected level information to the POI module controller 214 (207) exists. It consists of an output detector (Output Detector) 208 that detects the level of the DL signal output to the CHC (Channel Combiner) 110 and transmits the detected level information to the POI Module Controller 214 .

It exists on the DL link and is equipped with a Path Check Generator (206) to check the output status of POIs (106, 107, 108, 109) and to check whether there are any abnormalities in signal transmission. With the function of the Web-Based Screen Capture Function (212), it is possible to check whether there is an abnormality in the signal and the output, and a Variable Attenuator that serves to adjust the level to an appropriate level for the EOU (111). (204) is configured.

A variable attenuator that is present on the UL link and serves to adjust the amplified RF signal to an appropriate level through an AMP (Amplifier) 209 that amplifies the RF signal input through the EOU 111 to an appropriate level. (Variable Attenuator) 210 to adjust to an appropriate level and go through duplexer 201, or connect to BTS 101, 102, 104 or 5CU 105 through Switch 213 for sending output to UL single port do.

It is located on the UL path and is a function of the Web-Based Screen Capture Function 212 that monitors the waveform of the input UL signal. It is characterized in that it consists of a composition.

The DL configuration of the CHC 110 shown in FIG. 5 is shown, and the UL configuration may be configured in a different direction from the DL configuration. The connection of FIG. 6 is connected to the POIs 106, 107, 108, and 109, and through the input signal summing units 301, 302, 303, which serves to combine a plurality of downlink POI signals into one path, a variable type that appropriately attenuates the signal summed into one line. It has an attenuator (Variable Attenuator) 304, uses the AMP 305 to amplify to an appropriate output level, and consists of dividers 308, 309, and 310 for separating the amplified signal.

The output detector (Power Detector) 306, which serves to detect the level of the signal and transmits the detected level information to the Channel Combiner Module Controller 214, and the role of monitoring the waveform of the signal CHC 110 with the functionality of a Web-Based Screen Capture Function 307 .

The CHC 110 is a part that plays a role of distribution and summation, and can be changed to an N:N configuration according to a usage method.

CCMC (Channel Combiner Main Controller) 310 has an Auto Install function, so that the level and gain desired by the user as a percentage of the signal of the level input from the BTS 101, 102, 103, 104 for each carrier It is a function that enables the output at the desired ratio by setting it to . This function prevents the fluctuation of the power ratio so that it does not exceed the set ratio even when the signal of one carrier is input higher than the level set in the Auto Install step, so that each carrier output from the CHC 105 is output. It keeps the power ratio constant and as a result, the MC-DAS can keep the quality of service stable.

The Web-Based Screen Capture Function 307 of FIG. 6 receives the coupled signals of the DL 3001/UL 3002 signals respectively, after passing through the amplifier 3004, MIX ( Frequency Mixer, 3009), the frequency is varied with PLL (Phase Locked Loop, 3010), converted to a constant IF (Intermediate Frequency), amplified with AMP (3011), filtered through Filter (3012), and the output detector (Power Detector) 3014 detects the level. When a user inputs a signal capture frequency range to be checked in the Web-GUI (Web-Graphic User Interface), the value of the output detector 3014 is changed while automatically changing the frequency of the PLL 3010, and the change Values can be checked on the GUI screen as graphs and numerical values on the frequency axis and level axis.

FIG. 7 MCU 111 has a built-in power supply unit 112 therein to supply power, and performs system management and control functions of the MC-DAS 201 .

It is possible to connect and control the MC-DAS 201 with a mobile phone and remotely download firmware and software even in an environment in which a GUI cannot be connected to the MCU 111 using a PC such as a laptop computer.

The CU 111 is configured to support various communication methods such as Bluetooth, RF wireless modem, and Zigbee communication.

The remote unit (RU) 114 of FIG. 8 transmits the converted RF signal through the OECDU (Optic Electronic Channel Divider Unit; 112) for converting the optical signal input through the optical path into an RF signal. It is composed of a divider to distribute (Divider) (602, 603).

In the individual frequency channels RM (Remote Module) (114, 115, 117) of FIG. 9, the downlink signal input through the OECDU is amplified using the amplifier (9001, 9003), and an appropriate signal is passed through the Variable Attenuator (9002). By adjusting the level, it is amplified with a high power amplifier (9007) through a filter (9004) and a directional coupler (9005) that pass only a desired signal.

The high-power amplifier 9007 with an output of 5 Watts or more should minimize power consumption by applying analog PD, digital pre-distortion, or a linear power amplifier to maximize efficiency.

The signal of the high-power amplifier 9007 is radiated through the antenna 9009 by passing only a desired frequency band through the duplexer 9008 .

The UL signal input through the antenna 9009 and the duplexer 9008 is amplified to a low noise with a low noise amplifier 9010, and an appropriate attenuation is performed with a variable attenuator 9011, If it is a 5G signal by filtering the filter 9012 to remove the spurious signal and amplifying the signal 9014, it transmits the signal to the OECU 112 through the 5CU 113, and if it is not a 5G signal It is transmitted to the OECU 112 and converted into an optical signal through signal distribution and summation and transmitted to the HE.

The RM duplexer (DUPLEXER) 9008 must have excellent high-output PIM characteristics so that call quality is not affected by its PIM (Passive Intermodulation) characteristics.

The MC-DAS according to an embodiment of the present invention supports mobile communication standards and mobile communication protocols used worldwide. As an example, the frequency supports up to several GHz in the VHF band. The protocol supports AMPS, TDMA, GSM, CDMA, IDEN, WIMAX, LTE, WCDMA, public safety, GPRS, EDGE, paging, and the like. The mobile technology generation is also available in 1G, 2G, 3G, 4G, and 5G generations.

The above description of the present invention is for illustration, and those of ordinary skill in the art to which the present invention pertains can understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. There will be. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. For example, each component described as a single type may be implemented in a dispersed form, and likewise components described as distributed may be implemented in a combined form.

The scope of the present invention is indicated by the following claims rather than the above detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention. do.

Claims (12)

In the MC-DAS (Multi Channel-Distributed Antenna System),
It is connected to a base station (BTS) that does not support 5G communication and adjusts the input downlink (DL) signal to a specified level, transmits it to a channel combiner (CHC), and transmits the transmitted from the channel combiner. a plurality of Point of Interfaces (POIs) for transmitting an uplink (UL) signal to a specified level to a BTS;
The downlink signal connected to the 5G-BTS supporting 5G communication is converted into a frequency band that can be transmitted to the 5G POI and transmitted to the 5G POI, and the uplink signal transmitted from the 5G POI is returned to the 5G frequency band 5CU (5G Converter Unit) for
a main controller unit (MCU) that monitors and controls states of the POI, the 5G POI, and the channel combiner;
After combining each downlink signal transmitted from the POI and the 5G POI, it is transmitted to a Multi Channel-Distributed Antenna System (MC-DAS), and the uplink signal transmitted from the MC-DAS is distributed by distributing the a POI and a channel combiner (CHC) for transmitting the 5G POI;
an electro-optical converter (Electrical to Optic Unit) for receiving the downlink signal of the channel combiner (CHC), converting it into an optical signal and transmitting it through a transmission medium;
an optoelectric converter (Optic to Electrical Unit) for converting an uplink optical signal input through the transmission medium into an RF signal;
The downlink optical signal input through the transmission medium is converted into an RF signal, the converted RF signal is distributed, and the uplink synthesizes the signal input to the RM (Remote Module) of an individual frequency band, and the transmission medium Optic to Electrical Combiner and Divider Unit (OEDU) for transmission via ;
The downlink signal input through the photoelectric splitter is amplified to an appropriate level through the RM (Remote Module), and the signal band filtered through the duplexer through the High Power Amplifier (HPA) as a high output signal. It radiates through an antenna, and the uplink passes through a duplexer, passes through a duplexer, and passes through a low noise amplifier (LNA) to amplify the signal to a specified signal level. Module (Remote Module, RM); and
RCU (Remote Control Unit) that serves to monitor and control the status of the RM, the 5CU and the OECDU
MC-DAS (Multi Channel-Distributed Antenna System) comprising a.
According to claim 1,
The 5CU includes: a duplexer connected to the 5G-BTS to distinguish a downlink path and an uplink path;
a hybrid coupler or an RF switch that is present on the downlink path and the uplink path of the 5CU and serves to connect to the BTS;
a fixed attenuator for attenuating the downlink signal input to the 5G-BTS to an appropriate level;
an input detector that detects the downlink signal level input to the 5G-BTS and transmits the detected level information to the POI module controller;
a variable attenuator which is present on the downlink path and the uplink path, respectively, and adjusts an RF signal; and
Amplifier part present on the uplink path to amplify the uplink signal
MC-DAS, characterized in that it further comprises.
The method according to claim 1, wherein the 5CU is located between the 5G-BTS and the 5G POI, and the input 5G downlink signal is converted to a frequency within 6 GHz usable for the MC-DAS, and through the channel combiner. MC-DAS, characterized in that the input uplink signal is converted into a 5G signal.
The MC-DAS according to claim 3, wherein the 5CU is included in the 5G POI.
The method of claim 3, wherein the 5CU is located equally in the RM and the OECDU, the downlink input through the optical fiber converts the MC-DAS signal back to a 5G signal, and the 5G uplink input through the RM (Uplink). ) MC-DAS, characterized in that the signal is converted to a frequency within 6GHz that can be used in MC-DAS through RM.
The MC-DAS according to claim 5, wherein the 5CU is implemented by being included in the RM.
The method of claim 1, wherein the channel combiner (CHC) is configured based on the number of inputs and outputs of 8:8, and includes a variable attenuator and an amplifier for varying a signal level, and the MC-DAS comprising an output detector (Power Detector) for detecting all signal levels input to the channel combiner (CHC).
The method according to claim 7, wherein the channel combiner (CHC) includes a function of setting a specific level or ratio based on the detected information, and provides an auto-install function to enable automatic product installation. MC-DAS.
The MC-DAS according to claim 1, wherein the MCU (Main Controller Unit) allows a user to directly access and download firmware through a user control screen.
The user control screen according to claim 9, wherein the MCU (Main Controller Unit) is capable of communicating with the POI, the 5G POI, the channel combiner (CHC), and the 5CU, and is connected to a Distributed Antenna System (MC-DAS). MC-DAS, characterized in that the user can check and control the status of the POI, the 5G POI, the channel combiner (CHC) and the 5CU through the MC-DAS.
11. The method of claim 10,
The MCU (Main Controller Unit) is characterized in that it is possible to protect the quality of service of the BTS and the 5CU, POI, and CHC from input and output levels in ALC (Auto Level Control) and AGC (Auto Gain Control) functions, and ,
The MCU (Main Controller Unit) is an MC-DAS, characterized in that it includes a serial communication method including RS485 and Ethernet, an RF modem (Modem), and Bluetooth (Bluetooth) in the communication method.
11. The method of claim 10,
The MCU (Main Controller Unit) is physically separated from the MC-DAS (Distributed Antenna System), so even at a remote location where a GUI cannot be directly connected, Ethernet, RF Modem, Bluetooth including MC-DAS, characterized in that it is possible to check and control the status of Web-GUI (Graphic User Interface) and Mobile Web-GUI (Graphic User Interface), and download firmware.

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