KR101725775B1 - Method And Apparatus for Relaying Signal by Using Frequency Conversion - Google Patents

Abstract

An embodiment of the present invention relates to a signal relay apparatus and method using frequency conversion.
One embodiment of the present invention includes a first modem for transmitting / receiving a signal of a predetermined first frequency band out of a frequency band of a signal input through a first antenna; A second modem for transmitting and receiving a signal of a predetermined second frequency band among the frequency bands of the signal input through the second antenna; And converting the signal of the first frequency band into the signal of the second frequency band and transmitting the signal to the second modem, or converting the signal of the second frequency band into the signal of the first frequency band, And a conversion interface unit connected to the signal conversion unit.
According to an embodiment of the present invention, it is possible to secure service coverage for a plurality of frequency bands without using additional cables or antennas to use a specific frequency band.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal relaying apparatus and method using frequency conversion,

An embodiment of the present invention relates to a signal relay apparatus and method using frequency conversion. More particularly, the present invention relates to a method of using a specific frequency band by applying a prefabricated infrastructure for relaying a signal through a signal transmission device to a specific building or a signal relay device using frequency conversion for an infrastructure to be newly constructed And more particularly, to a signal relaying apparatus and method using frequency conversion that can ensure service coverage for a plurality of frequency bands without additional cables or antennas.

The contents described in this section merely provide background information on the embodiment of the present invention and do not constitute the prior art.

In recent years, demand for wireless data in the telecom market has been on the rise due to data-oriented marketing such as the launch of smart phones or tablet computers and unlimited data flat rate services. However, the biggest limitation of the activation of the wireless data is the capacity of the communication network that provides the actual wireless data service, which is considered to be caused by the limited channel capacity of the base station itself and the limitation of the wireless data capacity within the coverage. That is, since the maximum amount of wireless data that can be given to all users within a coverage of a base station is limited, the transmission rate per actual subscriber is inevitably reduced when more people use data communication.

Wiress LAN is the most popular alternative network solution for effective distribution of wireless LANs. Although it is possible to use the wireless Internet service separately from the instantaneous communication network using the wireless LAN, the coverage of the wireless LAN is absolutely insufficient compared to the mobile communication network, and since it takes a considerable amount of time and money to construct a new wireless LAN, need.

In order to solve the above-described problems, an embodiment of the present invention provides a signal relay apparatus using frequency conversion, which can secure service coverage for a plurality of frequency bands without using a separate cable or an antenna for using a specific frequency band. And to provide a method.

According to an aspect of the present invention, there is provided a wireless communication system including a first modem for transmitting and receiving a signal in a first frequency band of a frequency band of a signal input through a first antenna; A second modem for transmitting and receiving a signal of a predetermined second frequency band among the frequency bands of the signal input through the second antenna; And converting the signal of the first frequency band into the signal of the second frequency band and transmitting the signal to the second modem, or converting the signal of the second frequency band into the signal of the first frequency band, And a conversion interface unit connected to the signal conversion unit.

According to another aspect of the present invention, there is provided a method of transmitting a signal in a first frequency band, the method comprising: receiving a signal in a first frequency band of a frequency band of a signal input through a first antenna in a first modem; Converting the signal of the first frequency band into a signal of the second frequency band and transmitting the signal of the second frequency band; Transmitting a signal of the second frequency band through a second antenna in a second modem; Receiving a signal in a second frequency band of a frequency band of a signal input through the second antenna in the second modem; Converting the signal of the second frequency band into the signal of the first frequency band and transmitting the converted signal to the first modem; And transmitting the signal of the first frequency band through the first antenna in the first modem.

As described above, according to an embodiment of the present invention, a signal relay device using a frequency conversion is applied to a pre-established infrastructure or a new infrastructure to relay a signal through a signal transmission device to a specific building, It is possible to secure service coverage for a plurality of frequency bands without using additional cables or antennas to use the frequency bands.

According to an embodiment of the present invention, since a service of a specific frequency band can be provided using the infrastructure of a relay apparatus installed in an in building system, a separate feeder line, an antenna, and the like for transmitting the corresponding frequency band can be installed It is possible to provide a frequency band that meets the data demand of the user without need, and it is possible to distribute and receive the data traffic demand in the communication network.

In addition, according to an embodiment of the present invention, a repeater capable of providing a service of a specific frequency band without a separate wired network can be installed within a coverage of a frequency band that is already provided, thereby improving a wireless communication environment.

1 is a block diagram schematically showing a signal relay system using frequency conversion according to an embodiment of the present invention;
2 is a block diagram schematically showing a signal relay apparatus according to an embodiment of the present invention.
3 is a block diagram schematically showing a conversion interface unit according to an embodiment of the present invention.
4 is a flowchart illustrating a signal relaying method using frequency conversion according to an embodiment of the present invention.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram schematically illustrating a signal relay system using frequency conversion according to an embodiment of the present invention.

The signal relay system using frequency conversion according to an embodiment of the present invention includes a signal transmission device 110, a signal relay device 120, a first antenna 122, a second antenna 124, and an in- . Of course, in an embodiment of the present invention, the signal relay system using the frequency conversion may include a signal transmission apparatus 110, a signal relay apparatus 120, a first antenna 122, a second antenna 124, It will be understood by those of ordinary skill in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims. It will be possible to variously modify and modify the constituent elements included in the signal relay system using the frequency conversion within a range not deviating from the essential characteristics.

The signal transmission apparatus 110 is a device for transmitting a signal for voice or data communication. In addition, the signal transmission apparatus 110 performs baseband signal processing, transmission and reception of radio signals, and the like. The signal transmitting apparatus 110 is connected to a communication network and performs functions for performing services such as a voice communication service, a wireless data service, a wireless Internet service, a video call or a message service.

The signal relay device 120 refers to a device that amplifies a signal received from the signal transmitting device 110 and transmits the amplified signal to the in building system 130. The signal relay apparatus 120 according to an embodiment of the present invention transmits and receives a signal of a predetermined first frequency band out of the frequency band of the signal input through the first antenna 122, And transmits / receives a signal of a predetermined second frequency band among the frequency bands of the input signal. Also, the signal relay device 120 converts the signal of the first frequency band into the signal of the second frequency band, and converts the signal of the second frequency band into the signal of the first frequency band.

More specifically, the signal relay device 120 converts the frequency band from the signal of the first frequency band input through the first antenna 122 into noise (noise) Converts the signal of the second frequency band to a signal of the second frequency band, and amplifies the signal of the second frequency band and transmits the amplified signal to the second antenna. The signal relay device 120 removes noise from the signal of the second frequency band inputted through the second antenna 124, converts the signal into a signal of the first frequency band, amplifies the signal of the first frequency band, 1 antenna 122 in the uplink. Here, the signal relay apparatus 120 includes at least one of an LNA (Low Noise Amplifier), a frequency conversion unit, and an amplifier unit to perform signal processing for a downlink or an uplink.

The signal relay device 120 receives the signal of the frequency band of 800 MHz to 999 MHz or the signal of the frequency band of 1,900 MHz to 2,199 MHz through the first antenna 122 for signal relay, The signal is transmitted to the antenna 124 or the signal of the frequency band of 800 MHz to 999 MHz or the signal of the frequency band of 1,900 MHz to 2,199 MHz is transmitted through the second antenna 124 to the first antenna.

Here, a signal in a frequency band of 800 MHz to 999 MHz refers to a signal in a CDMA (Code Division Multiple Access) band. More specifically, the frequency band used for the uplink of the CDMA band may be a frequency band of 824 MHz to 849 MHz, and the frequency band used for the downlink may be a frequency band of 869 MHz to 894 MHz. Of course, the frequency bands of the uplink and the downlink in the CDMA band are not necessarily limited to these, and can be changed according to the frequency band allocated by each communication company. On the other hand, signals in the frequency band of 1,900 MHz to 2,199 MHz are signals in the WCDMA (Wideband Code Division Multiple Access) band. More specifically, the frequency band used for the uplink among the WCDMA bands may be a frequency band of 1,930 MHz to 1,960 MHz and 1,960 MHz to 1,980 MHz, and a frequency band used for the downlink may be 2,120 MHz to 2,150 MHz, It can be the frequency band of 2,170 MHz. Of course, the frequency bands of the uplink and the downlink in the WCDMA band are not necessarily limited to these, and can be changed according to the frequency band allocated by each communication company.

Also, the signal relay device 120 transmits and receives a signal of the first frequency band from the signal transmission device 110 using the first antenna 122. Also, the signal relay device 120 transmits and receives a signal of the second frequency band using the cable and the second antenna 124 installed in the in-building system 130. Here, the signal of the first frequency band is a signal having a frequency band of 2,300 MHz to 2,399 MHz, and refers to a Wibro signal. Here, WiBro is a wireless broadband Internet technology. Meanwhile, WiBro is a name for international standard IEEE 802.16e and is also called mobile WiMAX. On the other hand, the signal of the second frequency band is a signal having a frequency band of 2,400 MHz to 2,499 MHz, which is a Wi-Fi signal of a wireless LAN signal. Here, Wi-Fi refers to a set of technologies that support IEEE 802.11-based WLAN connections, device-to-device connections (Wi-Fi P2P), and PAN / LAN / WAN configurations. That is, since Wi-Fi is supported by many operating systems and terminals, some devices including a smart phone, a mobile phone, a PDA, a desktop, a notebook computer, a netbook, a game machine, and a printer perform communication using Wi-Fi. That is, within the coverage where the Wi-Fi signal is transmitted through the second antenna 124 as in the present invention, data communication can be used within a certain distance around the second antenna 124. That is, the WiFi signal is transmitted to the inside of the building through the second antenna 124. Since WiFi is a method using a radio frequency, a telephone line or a dedicated line is not required. When a wireless LAN module is provided in a terminal carried by the user, And can perform communication on the basis of 802.11 through the antenna 124.

Hereinafter, an example of converting a signal (WiBro signal) of a first frequency band into a signal (WiFi signal) of a second frequency band, in which a signal relay device 120 according to an embodiment of the present invention is considered to have a high demand, Explain it. For example, the signal relay device 120 may serve as a bridge for converting a WiBro signal (first frequency band) into a Wi-Fi signal (second frequency band). The signal relay device 120 receives the WiBro signal (first frequency band) within the coverage of the signal transmission apparatus 110 supporting the WiBro (first frequency band) (Second frequency band) to provide a Wi-Fi signal (second frequency band) to the inside of the in-building system 130 and conversely receives a signal generated in the terminal supporting the Wi-Fi (second frequency band) (First frequency band), and transmits the signal to the signal transmission apparatus 110 so that the signal transmission apparatus 110 transmits the signal to the Internet network, thereby enabling wireless communication. Of course, the external WiBro signal (first frequency band) should be sufficiently good to reach the area where the signal relay device 120 is installed. For this purpose, it is not preferable to apply the above-described method because the service can be extended if the donor / service antenna is installed externally and the feeder line is installed in the signal relay device 120, but the cost is excessively increased. In addition, if it is difficult to secure a desired coverage even if the WiBro signal (first frequency band) is sufficiently good to be input to the area where the signal relay device 120 is installed, additional Wi-Fi (second frequency band) Wi-Fi (second frequency band) service can be provided in the interval.

In the meantime, the signal relay device 120 is installed in a building and is operated, so it is not easy to visit the site for inspection or management. Therefore, the monitoring, management, remote control Additional functionality is required. In addition, the signal relay device 120 can integrally manage the wireless signal repeater function and the bridge function by using the first modem 210 and the second modem 220, which are essential. And the signal relay apparatus 120 may be separately managed by the upper monitoring server. In addition, when the signal relay apparatus 120 is installed in a new building, the second antenna 124 serving as a service antenna should be positioned mainly on a place where the subscriber mainly concentrates, so as to maintain the highest service quality through the signal of the second frequency band. In addition, when the signal repeater 120 is installed in place of a conventional repeater, the existing feeder line infrastructure can be used as it is, and if necessary, the donor / service antenna can be replaced, Make it possible to send out.

Further, the signal relay device 120 is capable of not only the signal of the frequency band of 800 MHz to 999 MHz, the signal of the frequency band of 1,900 MHz to 2,199 MHz, but also the signal of the frequency band of 2,300 MHz to 2,399 MHz It is preferable that the first antenna 122 is installed and oriented at a secured position. Further, in the present communication network, a signal of a frequency band of 2,300 MHz to 2,399 MHz (first frequency band) and a signal of a frequency band of 2,400 MHz to 2,499 MHz (second frequency band) are co- It is possible to provide services irrespective of the installation or direction of the first antenna 122. However, in order to smoothly provide the service of the second frequency band in some wireless environments, an input range of a first wide frequency band .

The first antenna 122 is a donor antenna for communicating with the signal transmitting apparatus 110 and is located outdoors to transmit and receive signals to and from the signal transmitting apparatus 110. In this case, a cable (feeder) is connected from the signal repeater 120 located in the room to the first antenna 122 located outdoors. For example, the first antenna 122 may transmit a signal of a frequency band of 2,300 MHz to 2,399 MHz (WiBro band) in addition to the frequency band (CDMA band) of 800 MHz to 999 MHz, the frequency band of 1,900 MHz to 2,199 MHz It is preferable that a triple band antenna is applied so that it can transmit and receive.

The second antenna 124 may be an antenna installed inside a specific building and may be a directional antenna for transmitting a signal received from the outside to a shaded area inside the building. For example, the second antenna 124 may transmit a signal of a frequency band of 2,400 MHz to 2,499 MHz (Wi-Fi band) in addition to the frequency band (CDMA band) of 800 MHz to 999 MHz, the frequency band of 1,900 MHz to 2,199 MHz It is preferable that a triple band antenna is applied so that it can transmit and receive.

Building system 130 is an in-building communication system constructed to accommodate subscribers in shadowed areas or hearing-impaired areas in a specific building, and is configured to transmit signals received from a wireless repeater through a coaxial cable or optical line Transmitting to an arbitrary place improves wireless environment such as expansion of serviceable area. That is, in order to supplement the wireless environment of a wired / wireless communication network in a building or a building, a cable (feeder) and an antenna are installed in a building or a building so that a good signal received from the outside can be served inside the building. Includes the infrastructure environment that is installed in the area.

2 is a block diagram schematically showing a signal relay apparatus according to an embodiment of the present invention.

The signal relay apparatus 120 includes a first modem 210, a second modem 220, a conversion interface unit 230, and a signal relay unit 240. Although the signal relay apparatus 120 includes only the first modem 210, the second modem 220, the conversion interface unit 230, and the signal relay unit 240 in the embodiment of the present invention It will be understood by those of ordinary skill in the art to which the present invention pertains that the present invention may be embodied in many other forms without departing from the spirit or essential characteristics thereof, The relay apparatus 120 may be modified and modified in various ways.

The first modem 210 and the second modem 220 are data communication devices that perform communication through modulation and demodulation. The first modem 210 transmits / receives a predetermined first frequency band signal among the frequency bands of the signals input through the first antenna 122. Here, the signal of the first frequency band has a frequency band of 2,300 MHz to 2,399 MHz. The first modem 210 transmits and receives a signal of the first frequency band from the signal transmitting apparatus 110. That is, the first modem 210 transmits and receives a signal having a frequency band of 2,300 MHz to 2,399 MHz and the signal transmission apparatus 110.

The second modem 220 transmits / receives a predetermined second frequency band signal among the frequency bands of the signals input through the second antenna 124. Here, the signal of the second frequency band has a frequency band of 2,400 MHz to 2,499 MHz. For example, the second modem 220 can transmit and receive a signal of a second frequency band to and from a terminal located in a specific building using the second antenna 124. At this time, the second modem 220 transmits and receives a signal of the second frequency band through the cable and the antenna installed in the interworking in-building system 130. That is, the second modem 220 transmits and receives a signal having a frequency band of 2,400 MHz to 2,499 MHz with a terminal located in a specific building.

The conversion interface unit 230 converts the signal of the first frequency band into a signal of the second frequency band and transmits the signal to the second modem or converts the signal of the second frequency band into the signal of the first frequency band, ). The conversion interface unit 230 removes noise from the signal of the first frequency band input through the first modem 210, converts the signal into a signal of the second frequency band, amplifies the signal of the second frequency band, And performs signal processing for the downlink to be transmitted to the base station 124. The conversion interface unit 230 removes noise from the signal of the second frequency band input through the second modem 220, converts the signal into a signal of the first frequency band, amplifies the signal of the first frequency band, And performs signal processing for the uplink to be transmitted to the base station 122.

The signal relay unit 240 receives the signal of the frequency band of 800 MHz to 999 MHz or the signal of the frequency band of 1,900 MHz to 2,199 MHz through the first antenna 122, amplifies the signal, and transmits the amplified signal to the second antenna 124 Or a signal of a frequency band of 800 MHz to 999 MHz or a signal of a frequency band of 1,900 MHz to 2,199 MHz via the second antenna 124, amplifies the signal, and transmits the amplified signal to the first antenna 122.

3 is a block diagram schematically showing a conversion interface unit according to an embodiment of the present invention.

The conversion interface unit 230 includes a downlink unit 310 and an uplink unit 320 according to an embodiment of the present invention. Of course, in an embodiment of the present invention, the conversion interface unit 230 includes only the downlink unit 310 and the uplink unit 320. However, the description of the technical idea of an embodiment of the present invention is not limited thereto It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims. Modifications and variations will be apparent to those skilled in the art.

The downlink unit 310 includes a downlink LNA 312, a downlink frequency converter 314, and a downlink amplifier 316. That is, the downlink unit 310 removes noise from the signal of the first frequency band input through the first modem 210, converts the signal into a signal of the second frequency band, amplifies the signal of the second frequency band, And performs signal processing for the downlink transmitted by the two antennas.

The downlink LNA 312 removes noise (noise component) from the signal of the first frequency band received from the signal transmitting apparatus 110 and transmits the signal to the downlink frequency transforming unit 314. The downlink frequency converter 314 converts the signal of the first frequency band from which noise has been removed into the signal of the second frequency band. That is, the downlink frequency conversion unit 314 converts a signal having a frequency band of 2,300 MHz to 2,399 MHz into a signal having a frequency band of 2,400 MHz to 2,499 MHz. The downlink amplifying unit 316 amplifies the signal of the second frequency band received from the downlink frequency converting unit 314 and radiates the corresponding signal through the second antenna 124.

The uplink unit 320 includes an uplink LNA 322, an uplink frequency converter 324, and an uplink amplifier 326. The uplink unit 320 removes noise from the signal of the second frequency band input through the second modem 220, converts the signal into a signal of the first frequency band, amplifies the signal of the first frequency band, And performs signal processing for the uplink to be transmitted to the base station 122.

The uplink LNA 322 removes noise (noise component) from the signal of the second frequency band received from the second modem 220, and transmits the signal to the uplink frequency converter 324. The uplink frequency converter 324 converts the signal of the second frequency band from which noise has been removed into the signal of the first frequency band. That is, the uplink frequency conversion unit 324 converts a signal having a frequency band of 2,400 MHz to 2,499 MHz into a signal having a frequency band of 2,300 MHz to 2,399 MHz. The uplink amplifying unit 326 amplifies the signal of the first frequency band received from the uplink frequency converting unit 324 and radiates the corresponding signal through the first antenna 122.

4 is a flowchart illustrating a signal relaying method using frequency conversion according to an embodiment of the present invention.

The signal relay device 120 receives a signal of a predetermined first frequency band out of the frequency band of the signal input through the first antenna 122 (S410). The signal relay apparatus 120 receives the signal of the first frequency band from the signal transmission apparatus 110 using the first antenna 122. [ That is, the signal relay device 120 receives the signal (WiBro signal) of the first frequency band having the frequency band of 2,300 MHz to 2,399 MHz from the signal transmission apparatus 110.

The signal relay device 120 converts the signal of the first frequency band into the signal of the second frequency band (S420). The signal relay device 120 converts the signal of the first frequency band inputted through the first antenna 122 into the signal of the second frequency band, And then converts the signal into a signal in the second frequency band, and amplifies the signal in the second frequency band. The signal relay apparatus 120 may include at least one of an LNA, a frequency converter, and an amplifier to perform signal processing for the downlink.

The signal relay apparatus 120 amplifies the signal of the second frequency band and transmits it through the second antenna 124 (S430). That is, the signal relay device 120 transmits the signal of the second frequency band using the cable and the second antenna 124 installed in the in-building system 130. The signal in the second frequency band is a signal having a frequency band from 2,400 MHz to 2,499 MHz, which is a Wi-Fi signal among the wireless LAN signals. That is, since many terminals owned by subscribers located in a certain building support such Wi-Fi, subscribers can receive Wi-Fi communication by receiving a signal of the second frequency band converted through the signal relay device 120 . That is, since communication via Wi-Fi can be performed using a smart phone, a mobile phone, a PDA, a desktop, a notebook computer, a netbook, a game machine, a printer, and some peripheral devices, a terminal capable of Wi- It is possible to perform data communication using Wi-Fi within a predetermined distance around the second antenna 124 within the coverage where the Wi-Fi signal is transmitted.

Conversely, when a subscriber terminal located in a specific building performs Wi-Fi communication through the signal relay device 120 and wants to transmit a Wi-Fi signal, the terminal transmits a signal of the second frequency band to the signal relay device 120 do. The signal relay apparatus 120 receives the signal of the second frequency band through the second antenna 124 in operation S440 and converts the signal of the second frequency band received in the signal of the first frequency band in operation S450. Specifically, the signal relay device 120 converts the signal of the second frequency band, which is input through the second antenna 124, into the first frequency band, And then converts the signal into a signal in the first frequency band and amplifies the signal in the first frequency band. Here, the signal relay apparatus 120 may include at least one of an LNA, a frequency converter, and an amplifier to perform signal processing for the uplink.

The signal relay apparatus 120 amplifies the signal of the first frequency band and transmits it through the first antenna 122 (S460). That is, since the signal transmitting apparatus 110 supports the first frequency band, the signal relay apparatus 120 transmits the signal of the first frequency band to the first antenna 122 in order to perform communication with the signal transmitting apparatus 110 To the signal transmission apparatus 110 via the network. Signals in the first frequency band are WiBro signals having a frequency band of 2,300 MHz to 2,399 MHz, and subscribers located in a specific building communicate with the signal having the frequency band of 2,400 MHz to 2,499 MHz through the signal relay device 120 Subscribers actually perform communication with signals received from the signal transmitting apparatus 110 having a frequency band of 2,300 MHz to 2,399 MHz.

Although it is described in FIG. 4 that steps S410 to S460 are sequentially executed, this is merely illustrative of the technical idea of one embodiment of the present invention. It is to be understood that the technical knowledge in the technical field to which the embodiment of the present invention belongs Those skilled in the art will understand that various changes and modifications may be made to those skilled in the art without departing from the essential characteristics of one embodiment of the present invention or by executing one or more of the steps S410 through S460 in parallel And therefore, it is not limited to the time-series order in Fig. As described above, the signal relaying method using the frequency conversion according to the embodiment of the present invention described in FIG. 4 can be implemented by a program and recorded in a computer-readable recording medium.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

As described above, the present invention can be applied to various fields in which service coverage for a plurality of frequency bands can be ensured without additional cables or antennas to use a specific frequency band, And is a useful invention that generates the effect of distributing the demand for data traffic in the communication network.

110: signal delivery device 120: signal relay device
122: first antenna 124: second antenna
130: In-building system 210: First modem
220: second modem 230: conversion interface unit
240: Signal relay unit 310: Downlink unit
320:

Claims (12)

A first modem for transmitting and receiving a predetermined specific mobile communication signal among signals of a plurality of mobile communication systems using a first antenna;
A second modem for transmitting and receiving a wireless LAN signal using a second antenna;
Converts the specific mobile communication signal received from the first modem into the wireless LAN signal, amplifies the wireless LAN signal, and transmits the amplified wireless LAN signal to the second modem, or converts the wireless LAN signal received from the two modems into the specific mobile communication signal A conversion interface unit for amplifying the amplified signal and transmitting the amplified signal to the 1 modem; And
And a signal relay unit for relaying the remaining mobile communication signals except for the specific mobile communication signal among the signals of the plurality of mobile communication systems between the first antenna and the second antenna,
And the signal repeater. The method according to claim 1,
The conversion interface unit,
A downlink unit for removing noise from the specific mobile communication signal input from the first modem and converting the noise into the wireless LAN signal, amplifying the wireless LAN signal, and transmitting the amplified wireless LAN signal to the second antenna; And
An uplink unit for removing noise from the signal of the wireless LAN signal input from the second modem and then converting the signal into the signal of the specific mobile communication signal and amplifying the signal of the specific mobile communication signal and transmitting the amplified signal to the first antenna;
And the signal repeater. 3. The method of claim 2,
Wherein the downlink unit or the uplink unit comprises:
An LNA (Low Noise Amplifier), a frequency converter, and an amplifier (Amplifier). delete The method according to claim 1,
Wherein the first modem transmits / receives the specific mobile communication signal from the signal transmission device. The method according to claim 1,
Wherein the second modem transmits and receives the wireless LAN signal through a cable and an antenna installed in an interworking in-building system. delete delete A first transmission / reception process of transmitting / receiving a predetermined specific mobile communication signal among signals of a plurality of mobile communication systems using a first antenna;
A second transmission / reception process of transmitting / receiving a wireless LAN signal using a second antenna;
Converts the specific mobile communication signal received from the first modem to the wireless LAN signal, amplifies the wireless LAN signal, and transmits the amplified wireless LAN signal to the second modem, or converts the wireless LAN signal received from the two modems into the specific mobile communication signal, A converting process of transmitting the data to the one modem; And
A relaying step of relaying the remaining mobile communication signals excluding the specific mobile communication signal among the signals of the plurality of mobile communication systems between the first antenna and the second antenna
And a signal relaying unit for transmitting the signal to the signal relaying unit. 10. The method of claim 9,
The conversion process includes:
Converts the signal into the wireless LAN signal after removing noise from the specific mobile communication signal input from the first modem, and amplifies the wireless LAN signal and transmits the amplified wireless LAN signal to the second antenna. 10. The method of claim 9,
The conversion process includes:
Wherein the noise removal unit removes noise from the wireless LAN signal input from the second modem, converts the noise into the specific mobile communication signal, amplifies the specific mobile communication signal, and transmits the amplified specific mobile communication signal to the first antenna. delete

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