KR100727076B1 - Signal dispersion system and method thereof - Google Patents

Abstract

A signal dispersion system and a method thereof are provided to guarantee quality of a call connection in an area crowded with buildings like large apartment complexes, and to make it easy for plural repeaters to extend or contract a mobile communication service with a tree structure by using a cable connected via an underground passageway in an area crowded with buildings. A signal dispersion system comprises main hubs(115), remote hubs(120,125,130), remote terminals(140,150,160), and antennas(122,132,142,152,162,172). The main hubs, installed at an indoor area, convert signals, received via a cable connected to a base station or a repeater, into optical signals or RF signals. The remote hubs, also installed at an indoor area, convert signals, received via a cable connected to the main hubs, into RF signals or optical signals. The remote terminals, also installed at an indoor area, amplify the RF signals received via an RF cable connected to the remote hubs. The antennas, connected to the remote terminals, are protruded on ground between buildings.

Description

Signal dispersion system and method

1 is a block diagram of a signal distribution system according to a first preferred embodiment of the present invention.

2 is a block diagram of a signal distribution system according to a second preferred embodiment of the present invention.

Figure 3 is a view showing the current state of the signal distribution system is installed in a dense building area according to an embodiment of the present invention.

4 is a view showing an antenna system installed on the ground between buildings to which the signal distribution system according to the preferred embodiment of the present invention is applied.

5 is a view showing a state in which the signal distribution system installed in a dense apartment area according to an embodiment of the present invention.

6 is a flowchart illustrating a method for providing a mobile communication service by a signal distribution system according to a preferred embodiment of the present invention.

7 and 8 illustrate field test analysis results when providing a mobile communication service by a signal distribution system according to a preferred embodiment of the present invention.

9 is a diagram illustrating a field test analysis result for each antenna in a signal distribution system according to an exemplary embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

105: base station (BTS) 110: donor light unit

115: main hub 120, 125, 130: remote hub

140, 150, 160, 170: remote terminal

122, 127, 132, 142, 152, 162, 172: antenna

TECHNICAL FIELD The present invention relates to mobile communication services, and more particularly, to a signal distribution system including optical dispersion and a method thereof.

In general, a mobile communication service system includes a base station, a repeater, a base station controller, an exchange station, and a user terminal. The base station and the mobile station communicate in a constant frequency band, and each base station and repeater has a constant call radius. Therefore, by appropriately disposing a plurality of base stations to overlap the call radius of each base station to expand the coverage area. However, even if the entire base is covered by the arrangement of the plurality of base stations, call shadowing areas are not available in large buildings, underground spaces, interiors of high-rise buildings, and residential areas. Due to the occurrence of the call shadow area, the mobile terminal user may not receive smooth call service within the call shadow area.

In order to solve this problem, conventionally, a radio frequency (RF) repeater was installed in the shaded area to solve the shaded area. However, since the radio waves are radiated only in the passage through which the leaky coaxial cable passes, the cable length is large in large skyscrapers. There is a disadvantage that the transmission loss occurs and the installation process in the building is not only complicated, but also expensive.

As a result, a light scattering antenna is used which converts a high frequency signal into an optical signal and emits it to a shaded area in a building. Repeater using optical dispersion antenna converts high frequency signal into optical signal and transmits it through optical cable and emits it to shadow area using optical dispersion antenna. However, there is a problem in that a large cost is consumed in installing a repeater using the optical cable and the optical dispersion antenna.

Therefore, there is a need for measures to resolve customer complaints about continuous call quality in dense buildings. Especially in densely populated areas such as high-density large-scale apartment complexes, light scattering repeaters are installed on the roofs of apartments to provide mobile communication services, but group complaints may occur due to the rejection of electromagnetic waves, and rents for rooftops may occur. There is a problem that the repeater can not serve both the ground and the ground at the same time. In addition, there is a problem in that the installation cost of a small, home-based repeater due to the inability to communicate underground and in the building. In order to solve such a problem, even if a plurality of optical repeaters are installed, an area where a bad call occurs will occur.

The present invention provides a signal distribution system and method capable of preventing a call quality degradation caused by the generation of unnecessary waves in providing a mobile communication service.

In addition, the present invention provides a signal distribution system and method for ensuring call quality in a dense area of a building, such as an apartment complex.

In addition, the present invention provides a signal distribution system and a method in which a plurality of repeaters provide a mobile communication service using a cable connected through an underground passage in a dense area of a building, thereby making it easy to expand and contract to a tree structure.

In addition, the present invention provides a signal distribution system and method that can reduce the cost by recycling because there is no need for a number of small and small repeaters currently installed.

In addition, the present invention provides a signal distribution system and method that can eliminate the shadow area by building an integrated in-building system using light dispersion.

Technical problems other than the present invention will be easily understood through the following description.

According to an aspect of the present invention, a system for providing a mobile communication service between a base station or a repeater and a user's mobile terminal in a dense building area, the signal received by being connected via the cable to the base station or repeater and the optical signal or One or more main hubs which are converted into an RF signal and outputted and installed indoors; One or more remote hubs connected to the main hub through an optical cable and converting the received signals into RF signals or optical signals and outputting the signals; One or more remote terminals connected to the remote hub by amplifying and outputting an RF signal received and installed indoors; And one or more antennas connected to the remote terminal and protruding from the ground formed between buildings.

Here, the main hub, the remote hub and the remote terminal may be connected through the underground passage.

Here, the main hub, the remote hub and the remote terminal may be installed indoors of different buildings.

Here, at least one of the main hub, the remote hub, and the remote terminal may monitor the radio quality of the installed building.

Here, the antenna may be installed on the ground formed between the buildings facing each other.

Here, the antenna may be installed on the ground surrounded by the building slope.

In addition, the signal distribution system according to the present invention may further include a coupler connected to the antenna and for branching the signal received from the base station or repeater to radiate through the indoor antenna installed in the indoor.

In addition, the signal distribution system according to the present invention is coupled between the base station or repeater and the main hub converts the output signal of the base station or repeater to an optical signal and outputs to the main hub, the optical signal received from the main hub The apparatus may further include a donor optical unit converting the RF signal into an RF signal and outputting the converted RF signal to the base station or the repeater.

In addition, according to another embodiment of the present invention, in a system for providing a mobile communication service between a base station or repeater and a user's mobile terminal in a dense building area, the signal received by being connected via the cable to the base station or repeater One or more main hubs which are converted into a signal or an RF signal and output and are installed indoors; At least one remote device connected to the main hub via an optical cable and converting the received signal into an RF signal or an optical signal and outputting the signal; And one or more antennas connected to the remote device and protruding from the ground formed between the buildings.

The remote device may include one or more remote hubs connected to the main hub through an optical cable and converting the received signals into RF signals or optical signals and outputting the signals; And it may include one or more remote terminals that are installed indoors by amplifying and outputting an RF signal received by being connected to the main hub or the remote hub via an RF cable.

In addition, according to another embodiment of the present invention, a method for providing a mobile communication service between a base station or repeater and a user's mobile terminal in a dense building area, the main hub installed indoors through an RF cable installed in an underground passage Receiving a signal from the connected base station or repeater; The main hub converting the signal into an optical signal and outputting the optical signal; A remote hub connected to the main hub through an underground passage, receiving the output optical signal and converting the converted optical signal into an RF signal; Receiving, by a remote terminal connected to the remote hub through an underground passage, the RF signal output from the remote hub; And outputting the RF signal to the ground by an antenna connected to the remote terminal and protruding from the ground formed between the buildings to provide the mobile communication service of the signal distribution system.

In addition, the mobile communication service providing method of the signal distribution system according to the present invention further comprises the step of the coupler connected to the antenna branching the signal received from the base station or repeater and radiating through the indoor antenna installed in the indoor Can be.

Hereinafter, exemplary embodiments of a signal distribution system and a method thereof according to the present invention will be described in detail with reference to the accompanying drawings. In the following description with reference to the accompanying drawings, the same components are denoted by the same reference numerals. And duplicate description thereof will be omitted. In the following description of the present invention, if it is determined that the detailed description of the related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

1 is a block diagram of a signal distribution system according to a first preferred embodiment of the present invention. Referring to FIG. 1, a signal distribution system according to the present invention includes a base station (BTS) 105, a donor optical unit (DOU: Donor Optic Unit) hereinafter 110, and a main hub (MHU). Main Hub Unit, hereinafter referred to as 'main hub' (115), Remote Hub (RHU: Remote Hub unit, hereinafter referred to as 'Remote Hub') (120, 125, 130), Remote Terminal (RU: Remote unit, hereinafter) 140, 150, 160, 170, and antennas 122, 127, 132, 142, 152, 162, and 172.

The donor optical unit 110 is connected to the base station 105 via an RF cable, and is connected to the main hub 115 through an optical cable to convert an output signal of the base station into an analog optical signal, and then through the optical cable to the main hub 115. ) And converts the optical signal received from the main hub 115 into an RF signal and outputs the RF signal to the base station 105.

The main hub 115 is connected between the donor light unit 110 and the remote hubs 120, 125, 130 via an optical cable to provide a signal between the donor light unit 110 and the remote hubs 120, 125, 130. Send and receive The main hub 115 outputs the analog optical signal output from the donor optical unit 110 to the remote hubs 120, 125, and 130 through the optical cable as it is. In addition, the main hub 115 converts the analog optical signal output from the donor light unit 110 into an RF signal and outputs the RF signal to the remote terminal 170 (1) through an RF cable. Here, the main hub 115 is considered in consideration of visible distance propagation, diffraction and reflection effects (hereinafter, referred to as propagation characteristics), equipment (MHU, RHU, RU), antenna output strength, building density, and loss value. Remote hubs 120, 125, 130 or RU 50 may be selectively connected.

In general, the remote terminal 170 (1) is directly connected to the main hub 115 without being connected to the remote hubs 120, 125, and 130. In addition, three remote hubs 120, 125, and 130 may be connected to one main hub 115.

In addition, the main hub 115 outputs an analog optical signal output from the remote hubs 120, 125, and 130 to the donor optical unit 110 via an optical cable as it is, and the RF output from the remote terminal 170 (1). The signal is converted into an analog optical signal and output to the donor light unit 110.

The remote hubs 120, 125, and 130 convert the analog optical signals output from the main hub 115 into RF signals to the remote terminals 140 (1), 150 (1), and 160 (1) through the RF cable. The RF signal received from the remote terminals 140 (1), 150 (1), and 160 (1) is converted into an analog optical signal and output to the main hub 115 through an optical cable.

The main hub 115 or the remote hubs 120, 125, and 130 may connect 8 to 10 remote terminals 140, 150, 160, and 170 using one RF cable.

The remote terminals 140, 150, and 160 are connected to the remote hubs 120, 125, and 130 through an RF cable, and amplify the RF signals output from the remote hubs 120, 125, and 130 to antennas 142, 152, and 162. ) To the user terminal (not shown), amplifies the transmission signal of the user terminal and outputs to the remote hub (120, 125, 130) through the RF cable. As described above, the remote terminal 170 (1) is directly connected to the main hub 115 to amplify the RF signal output from the main hub 115 to output to the mobile terminal through the antenna 172 (1). It may be.

Here, the remote hubs 120, 125, and 130 and the remote terminals 140, 150, and 160 control signals transmitted and received from the main hub 115, and thus, may be referred to as remote devices.

In addition, since the main hub 115 may not be installed with its own antenna, a plurality of remote hubs 120, 125 and 130 connected to the main hub 115 and a plurality of remote terminals connected to the remote hubs 120, 125 and 130 may be used. A plurality of antennas 122, 127, 132, 142, 152, 162, and 172 are installed in the 140, 150, and 160, and the remote hubs 120, 125, 130 or the remote terminals 140, 150, 160, and 170 are installed. More than 2 antennas per antenna can be installed.

Such equipment (main hub, remote hub, remote terminal) and antennas 122, 127, 132, 142, 152, 162, and 172 may be installed in consideration of propagation characteristics, output strength, density of buildings, loss values, and the like. have.

2 is a block diagram of a signal distribution system according to a second preferred embodiment of the present invention. 2, a signal distribution system according to the present invention includes a base station or repeater 205, a main hub 215, remote hubs 220, 225, 230, remote terminals 240, 250, 260, 270 and antennas. (222, 227, 232, 242, 252, 262, 272). The main hub 215 is directly connected to the base station or repeater 205 and is the same as the first embodiment described above except that a separate donor light unit 110 is not provided. Accordingly, the main hub 215 converts the RF signal output from the base station or repeater 205 into an optical signal and outputs the optical signal to the remote hubs 220, 225, and 230 through an optical cable. In addition, the main hub 215 outputs the RF signal output from the base station or repeater 205 to the remote terminal 270 (1) through the RF cable as it is.

The block diagram illustrating a signal distribution system for providing a mobile communication service in general has been described above. Hereinafter, with reference to the accompanying drawings, a building in which a signal distribution system for providing a mobile communication service according to the present invention is installed. With reference to the form of the description will be described with reference to specific embodiments.

3 is a diagram illustrating a state in which a signal distribution system according to a preferred embodiment of the present invention is installed in a building dense area. Referring to FIG. 3, the base station 310, the donor light unit 320, the building in which the main hub is installed 330, the building in which the remote hub is installed 340, and the buildings 350 and 360 in which the remote terminal is installed are illustrated.

Each piece of equipment in the building is installed indoors (including underground), and each piece of equipment is connected through an underground passageway. In other words, if each equipment is installed on the ground of the building's rooftop, etc., problems such as group complaints due to the rejection of electromagnetic waves and rent for the rooftop installation may occur. Can be installed in parking lot, electric room, etc. Here, the donor light unit 320, the main hub and the remote hub are connected to each other by a ray, and the cable between the remote hub and the remote terminal, and the main hub and the remote terminal may be connected by a coaxial cable. The length of the coaxial cable may be determined according to conditions such as loss rate, expandability, and the like, and may preferably be about 200M.

In addition, in order to provide a mobile communication service on the ground, an antenna connected to each device protrudes to the ground. The shape of the antenna protruding to the ground can vary widely, and preferably, depends on the density of the surrounding buildings.

In addition, the donor light unit 320, the main hub, the remote hub, and the remote terminal installed in each building may monitor the propagation environment of each building. That is, each device has an advantage that it is easy to measure the propagation status of each building by monitoring the radio wave environment such as good reception and reception of each building's radio waves, many and few unnecessary waves, and easily take the corresponding measures. Since the monitoring function of each device is a natural technology for a typical mobile communication provider, a detailed description thereof will be omitted.

Here, according to the present invention, there is no need to install a conventional optical repeater, so that the cost of rent, electricity, etc. can be reduced, and the length of the dedicated circuit can be shortened. Therefore, there is an advantage that can reduce the operating cost as well as the installation cost.

4 is a view showing an antenna system installed on the ground between buildings to which the signal distribution system according to the preferred embodiment of the present invention is applied. 4, dense buildings 410 and 420, outdoor antenna 430, coupler 440, indoor antennas 450 and 460 installed indoors, and signal distribution system 470 are illustrated.

The signal distribution system 470 installed underground or inside the building may include the above-described donor light unit, main hub, remote hub, and remote terminal. The coupler 440 is coupled to the remote terminal, and the coupler 440 is outdoors. The antenna 430 and the indoor antennas 450 and 460 installed in the indoors (including the underground) are combined. Here, the antennas 450 and 460 installed underground may provide mobile communication services to user terminals in the basement. The indoor antennas 450 and 460 installed indoors may be small and medium antennas such as Yagi antennas or omni antennas, and it is natural that antennas having other shapes and functions may be applied to the present invention. The degree at which the coupler branches the signal may vary depending on the performance, function, etc. of the coupler. For example, in the case of a -10 dB coupler, when the total power of the repeater is 35 dBm, the power radiated from the coupler to the antenna 450 (eg, Yagi antenna) installed underground through the cable is 25 dBm. As it is better, it is enough to cover indoors especially underground parking lot. Here, the coupler 440 is connected to the antennas 450 and 460 installed underground by placing a divider, and the insertion loss of the coupler 440 is about 0.3 dB, and such a loss has a great influence on providing a mobile communication service. Do not. Therefore, it is not necessary to install an underground repeater (miniature, indoor type, etc.), there is an advantage that can prevent the generation of unwanted waves.

In addition, in the conventional system, a small or ultra small repeater must be installed in the basement separately, which is expensive and maintenance costs are continuously increased. However, the ground service method according to the present invention secures call coverage by installing RF equipment that has not been previously installed by connecting a feeder line through an apartment parking lot entrance, a staircase room (air exit), and serving an outdoor output at about 35 dBm. Can be.

FIG. 5 is a diagram illustrating a state in which a signal distribution system according to a preferred embodiment of the present invention is installed in an apartment dense area. Referring to FIG. 5, apartment buildings 503, 506, 509, 513, 516, 519, 523, 526, 529, 533, 536, 539, 543, 546, 549, 553, 556, 559, 563, 566, 569 ), Installed outdoor antennas 572, 574, 576, 578, 582, 584, 586 are shown.

Outdoor antennas are for apartment buildings (503, 506, 509, 513, 516, 519, 523, 526, 529, 533, 536, 539, 543, 546, 549, 553, 556, 559, 563, 566, 569). It is installed according to the arrangement. That is, the outdoor antenna 572 is installed on the ground surrounded by apartment buildings 503, 506, and 509 on three sides, and the outdoor antennas 574, 576, 578, 582, 584, and 586 are apartments on four sides. It is installed on the ground surrounded by copper. In general, a location that can provide the best mobile communication service in a dense building may be an outdoor antenna installation location, and may be other than the above-described case. For example, when apartment buildings are stacked one by one, an outdoor antenna may be installed at the center of the ground formed between each opposite building.

6 is a flowchart illustrating a method for providing a mobile communication service by a signal distribution system according to a preferred embodiment of the present invention. Hereinafter, the base station or the repeater 610 will be described mainly in the forward direction for transmitting a signal to the user terminal 650, but may be described in the same way for the reverse direction.

In step S615, the base station or repeater 610 transmits an RF signal to the main hub 620. The main hub 620 converts the received RF signal into an optical signal and then transmits the optical signal to the remote hub 630 in step S625. The remote hub 630 converts the received optical signal into an RF signal and then transmits an RF signal to the remote terminal 640 in step S635.

In step S645, the remote terminal 640 transmits an RF signal to the outdoor antenna 650 protruding from the ground, and in step S655, the outdoor antenna 650 transmits an RF signal to the user terminal 660. . Thereafter, the user terminal 660 receives a corresponding signal and receives a mobile communication service.

Here, the case where the main hub 620 is directly connected to the base station or the repeater 610 has been described, but the above-described donor light unit may be placed therebetween. In addition, although the case in which the remote hub 630 is connected between the main hub 620 and the remote terminal 640 has been described, the main hub 620 is directly coupled to the remote terminal 640 as described above. The signal can be transmitted without conversion.

7 and 8 illustrate field test analysis results when providing a mobile communication service by a signal distribution system according to an exemplary embodiment of the present invention. FIG. 7 illustrates a case of using an outdoor omni antenna, and FIG. 8 illustrates a case of using an indoor omni antenna.

Referring to FIG. 7, the antenna type is an outdoor type 360-9-0 (where 360 represents omnidirectional, 9 represents gain, and 0 represents a degree of tilt), and in the case of the lower layer, the RSSI value. This looks good. It can be seen that the Tx power of the terminal is formed low and the PN pollutant is substantially removed. The average value of these data is as follows.

Before installation after installing Deviation RSSI -88 -75 -13 Ec / Io -9 -3 -6 Tx-power 7 -8 -5

Referring to FIG. 8, the antenna type is indoor type 360-2-0, and the gain is smaller than that of the antenna used in FIG. 7. By adjusting the direction to 3 way, it can be seen that the high RSSI level value is formed well, the Tx power of the terminal is formed low, and the PN pollutant is substantially removed. The average value of these data is as follows.

Before installation after installing Deviation RSSI -83 -67 -16 Ec / Io -8 -3 -5 Tx-power 4 -8 -12

FIG. 9 is a diagram illustrating a field test analysis result for each antenna in a signal distribution system according to an exemplary embodiment of the present invention. 9, the 360-9-0 and 360-0-0 equipment of the antenna type of the signal distribution system was compared.

As a result of comparing antennas, the use of 360-0-0 equipment shows good RSSI at higher floors, which has the advantage of covering the higher floors of buildings. The average value of these data is as follows.

360-9-0 360-0-0 Deviation RSSI -75 -67 -8 Ec / Io -3 -3 - Tx-power -8 -8 -

Here, the 360-0-0 equipment is suitable for high-rise service with a short distance because the vertical beam width is larger than that of the 360-9-0 equipment.

That is, the beam width of the antenna has a vertical beam width and a horizontal beam width. Here, the vertical beam width represents the characteristic of the directional antenna, and is an angle between half-values of the maximum radiated power in the vertical plane, and the horizontal beam width represents the characteristic of the directional antenna, and the maximum radiated power in the horizontal plane. The angle between half-values of. 360-9-0 equipment (eg length can be 1560mm) has a high gain, so the vertical beam width is 7 ', and 360-0-0 equipment (eg length can be 216mm) Since V is low gain, the vertical beam width can be 78 '. In general, the part where power is 3dB is perpendicular to the beam, and when a high-rise cover is used, the 360-0-0 device or the 360-2-0 device (360-0-0 device) is used without using a 360-9-0 antenna. 360-2-0 equipment has a lot of vertical beam width and horizontal beam width. The bottom layer has no difference in coverage even with the 360-9-0 antenna.

The present invention is not limited to the above embodiments, and many variations are possible by those skilled in the art within the spirit of the present invention.

As described above, the signal distribution system and the method according to the present invention have an effect of preventing the degradation of the call quality due to the generation of unnecessary waves in providing a mobile communication service.

In addition, the signal distribution system and method according to the present invention has the effect of ensuring the call quality in a dense area of the building, such as apartment complex.

In addition, the signal distribution system and the method according to the present invention has the effect that it is easy to expand and contract to a tree structure by providing a plurality of repeater mobile communication services using a cable connected through an underground passage in a building dense area have.

In addition, the signal distribution system and the method according to the present invention does not need a large number of small and small repeaters currently installed there is an effect that can reduce the cost by recycling.

In addition, the signal dispersion system and the method according to the present invention has the effect of eliminating the shadow area by building an integrated in-building system using light dispersion.

Although the above has been described with reference to a preferred embodiment of the present invention, those of ordinary skill in the art to the present invention without departing from the spirit and scope of the present invention and equivalents thereof described in the claims below It will be understood that various modifications and changes can be made.

Claims (12)

A system for providing a mobile communication service between a base station or a repeater and a user's mobile terminal in a dense building area, One or more main hubs connected to the base station or repeater and connected to the base station or the repeater to convert the received signal into an optical signal or an RF signal and output the converted signal; One or more remote hubs connected to the main hub through an optical cable and converting the received signals into RF signals or optical signals and outputting the signals; One or more remote terminals connected to the remote hub by amplifying and outputting an RF signal received and installed indoors; And Includes one or more antennas connected to the remote terminal and protruding from the ground formed between buildings, And the main hub, the remote hub, and the remote terminal are respectively installed indoors of different buildings and connected through an underground passage, and at least one of them monitors the wireless quality of the installed building. delete delete delete The method of claim 1, The antenna is a signal distribution system, characterized in that installed on the ground formed between the building facing each other. The method of claim 1, The antenna is a signal distribution system characterized in that the slope is installed on the ground surrounded by the building. The method of claim 1, And a coupler connected to the antenna and radiating the signal received from the base station or the repeater to radiate through the indoor antenna installed indoors. The method of claim 1, Combined between the base station or repeater and the main hub to convert the output signal of the base station or repeater to an optical signal to output to the main hub, and converts the optical signal received from the main hub to an RF signal to the base station or repeater Signal dispersing system further comprises a donor optical unit (Donor Optic Unit) for outputting. A system for providing a mobile communication service between a base station or a repeater and a user's mobile terminal in a dense building area, One or more main hubs connected to the base station or repeater and connected to the base station or the repeater to convert the received signal into an optical signal or an RF signal and output the converted signal; At least one remote device connected to the main hub via an optical cable and converting the received signal into an RF signal or an optical signal and outputting the signal; And At least one antenna connected to the remote device and installed to protrude on the ground formed between the building, And the main hub and the remote device are respectively installed indoors of different buildings and are connected through an underground passage, at least one of which monitors the radio quality of the installed building. The method of claim 9, The remote device One or more remote hubs connected to the main hub through an optical cable and converting the received signals into RF signals or optical signals and outputting the signals; And Signal distribution system comprising one or more remote terminals that are amplified and output the RF signal received by being connected to the main hub or the remote hub via an RF cable. A method of providing a mobile communication service between a base station or a repeater and a user's mobile terminal in a dense building area, Receiving a signal from the base station or repeater connected to the main hub installed indoors through an RF cable installed in an underground passage; The main hub converting the signal into an optical signal and outputting the optical signal; A remote hub connected to the main hub through an underground passage, receiving the output optical signal and converting the converted optical signal into an RF signal; Receiving, by a remote terminal connected to the remote hub through an underground passage, the RF signal output from the remote hub; And And an antenna connected to the remote terminal and protruding from the ground formed between the buildings to output the RF signal to the ground. The main hub, the remote hub and the remote terminal are each installed indoors of different buildings and connected through an underground passage, any one or more of them is a mobile communication service providing method of a signal distribution system for monitoring the wireless quality of the installed building . The method of claim 11, And a coupler connected to the antenna for branching the signal received from the base station or the repeater and radiating the signal through the indoor antenna installed in the indoor space.

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