KR20160126610A - Distributed antenna system and remote apparatus thereof - Google Patents

Abstract

A remote device according to an embodiment of the present invention is a remote device of a distributed antenna system and includes a remote optical transmitting / receiving unit configured to convert a received downlink optical signal into a downlink transmission signal, An interface unit configured to receive a downlink transmission signal from the interface unit and output a downlink transmission signal along a preset downlink path, A first band processing unit configured to amplify and output a first downlink RF signal among a plurality of downlink RF signals of a band, and a second band processing unit configured to receive a downlink transmission signal from the first band processing unit, A second band configured to amplify and output a second downlink RF signal of the downlink RF signals of the second band It includes parts of Li.

Description

[0001] DISTRIBUTED ANTENNA SYSTEM AND REMOTE APPARATUS THEREOF [0002]

The technical idea of the present invention relates to a distributed antenna system and its remote device. More particularly, the technical idea of the present invention relates to a distributed antenna system and a remote device thereof that are easy to operate by an administrator.

Due to the development of mobile communication, the usage of mobile communication is rapidly increasing, and users want to be provided with stable communication service without being restricted by time and space. However, there has been a problem that it is difficult for the service provider to provide a smooth communication service to the users due to the limited output of the base station, the limitation of the location of the base station and the surrounding terrain, and the shadow area. System (Distributed Antenna System, DAS) is used.

Distributed antenna system provides communication service to the shaded area where the signal of the base station is difficult to reach because it is installed in an area where radio waves are not received or radio reception is weak, such as inside a building, a building underground, a subway, a tunnel, A head end device communicatively connected to the base station, and at least one remote device connected to the head end device through the optical transmission medium and communicatively connected to the user terminal.

Recently, a distributed antenna system employs a neutral host architecture so as to integrally support a variety of services (for example, multi-band, multi-carrier service, etc.) of a specific service provider or services of a plurality of service providers. With the adoption of the neutral host architecture, the design complexity of the headend device and the remote device of the distributed antenna system is increased, and the manager is having difficulty in quickly responding to a failure occurring during the operation. Also, It is becoming difficult to efficiently cope with changes and the like.

A distributed antenna system and a remote apparatus thereof according to the technical idea of the present invention are intended to provide a distributed antenna system capable of improving the flexibility of the administrator and improving scalability, And a remote device thereof.

A remote device of a distributed antenna system according to an aspect of the present invention includes a remote optical transmitting / receiving unit configured to convert a received downlink optical signal into a downlink transmission signal; An interface unit configured to receive the downlink transmission signal from the remote optical transmission / reception unit and output the downlink transmission signal along a predetermined downlink path; A first band configured to receive the downlink transmission signal from the interface unit and to amplify and output a first downlink RF signal of a plurality of downlink RF signals of different frequency bands included in the downlink transmission signal, A processor; And a second band processing unit configured to receive the downlink transmission signal from the first band processing unit and to amplify and output a second downlink RF signal of the plurality of downlink RF signals included in the downlink transmission signal, .

According to another aspect of the present invention, there is provided a distributed antenna system comprising: a plurality of downlink RF signals received from a plurality of base stations and combining a plurality of downlink RF signals of different frequency bands to generate a downlink transmission signal; A head end apparatus configured to convert a downlink optical signal; And means for receiving the downlink optical signal from the head end device, converting the downlink optical signal into the downlink transmission signal, amplifying the plurality of downlink RF signals contained in the downlink transmission signal, And a remote device configured to transmit a plurality of downlink RF signals through at least one antenna, wherein the remote device is cascade-connected with each other to transmit the downlink transmission signal from a front end to a rear end, And a plurality of band processing units configured to amplify a downlink RF signal of a corresponding frequency band among the plurality of downlink RF signals included in the downlink transmission signal.

INDUSTRIAL APPLICABILITY The distributed antenna system and its remote device according to embodiments of the present invention can easily respond to an abnormal occurrence of a specific service or the like by an administrator so that the convenience of operation and management can be improved, So that flexibility and expandability can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS A brief description of each drawing is provided to more fully understand the drawings recited in the description of the invention.
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a diagram illustrating a topology of a distributed antenna system to which the technical idea of the present invention can be applied. FIG.
2 is a view schematically showing a part of a head end apparatus according to an embodiment of the present invention.
FIG. 3 is a view schematically showing a part of an expansion device according to an embodiment of the present invention.
FIG. 4 and FIG. 5 are views schematically showing a part of a configuration of a remote device according to an embodiment of the present invention.
Figs. 6 to 9 are exemplary diagrams showing in detail some configurations of the band processing units shown in Fig.
10 to 12 are views schematically showing a part of a configuration of a remote device according to another embodiment of the present invention.

While the present invention has been described in connection with certain exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and similarities. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description of the present invention, detailed description of known related arts will be omitted when it is determined that the gist of the present invention may be unnecessarily obscured. In addition, numerals (e.g., first, second, etc.) used in the description of the present invention are merely an identifier for distinguishing one component from another.

Also, in this specification, when an element is referred to as being "connected" or "connected" with another element, the element may be directly connected or directly connected to the other element, It should be understood that, unless an opposite description is present, it may be connected or connected via another element in the middle.

It should be noted that the terms such as " unit, "" to, "and" to module ", as used herein, mean units for processing at least one function or operation, Or a combination of hardware and software.

It is to be clarified that the division of constituent parts in this specification is merely a division by each main function of each constituent part. That is, two or more constituent parts to be described below may be combined into one constituent part, or one constituent part may be divided into two or more functions according to functions that are more subdivided. In addition, each of the constituent units described below may additionally perform some or all of the functions of other constituent units in addition to the main functions of the constituent units themselves, and that some of the main functions, And may be carried out in a dedicated manner.

A distributed antenna system according to an embodiment of the present invention is a coverage system for an in-building service that delivers voice communication and data communication with high quality and seamless access. It is also a system for servicing analog and digital telephone systems servicing in multiple bands to at least one antenna.

The distributed antenna system according to an exemplary embodiment of the present invention improves a poor propagation environment in a building and can improve the reception signal strength (RSSI) and the overall reception sensitivity of the mobile terminal, Improves chip energy / others interference (Io), and provides mobile communication services to corners of the building, allowing communication service users to freely talk anywhere in the building.

The distributed antenna system according to an embodiment of the present invention can support a mobile communication standard used worldwide. For example, the distributed antenna system may be configured to use a frequency of a very high frequency (VHF), ultra high frequency (UHF), 700 MHz, 800 MHz, 850 MHz, 900 MHz, 1900 MHz, 2100 MHz, In addition, it can support TDD service. The distributed antenna system includes an AMPS, a Time Division Multiplexing Access (TDMA), a Code Division Multiple Access (CDMA), a Code Division Multiple Access Asynchronous Wideband Code Division Multiple Access (WCDMA), High Speed Downlink Packet Access (HSDPA), Long Term Evolution (LTE), Long Term Evolution Advanced (LTE-A), etc. And can support a plurality of mobile communication standards.

Hereinafter, embodiments of the present invention will be described in detail.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a diagram exemplarily showing a topology of a distributed antenna system to which the technical idea of the present invention can be applied. Fig.

Referring to FIG. 1, a distributed antenna system (DAS) includes a head end apparatus 10 communicatively connected to a base station and constituting a headend node, an extension apparatus 20, and a plurality of remote devices 30, 40 that constitute a remote node and are disposed at each remote service location and communicatively connected to the user terminal. The distributed antenna system (DAS) can be implemented as an analog distributed antenna system. However, the technical idea of the present invention is not limited thereto. The distributed antenna system (DAS) may be implemented as a digital distributed antenna system, and in some cases may be implemented in a mixed form thereof (e.g., some nodes perform analog processing and the remaining nodes perform digital processing). Hereinafter, it will be described that the distributed antenna system (DAS) is implemented as an analog distributed antenna system.

1 shows an example of a topology of a distributed antenna system (DAS), and a distributed antenna system (DAS) is used in an installation area and an application field (for example, an in-building, a subway, , Hospital (hospital), stadium (stadium), etc.). That is, the numbers of the head end apparatus 10, the expansion apparatus 20, and the remote apparatuses 30, 40 and the connection relationship between the upper and lower ends thereof may differ from those of FIG. For example, at least one remote device (30) directly connected to the head end device (10) or at a lower end of any one of the remote devices (40) directly connected to the expansion device (20) Lt; / RTI >

Also, in the distributed antenna system (DAS), the expansion device 20 can be utilized when the number of branches to be branched from the head end device 10 to the STAR structure is limited compared to the number of remote devices required for installation . Therefore, the expansion device 20 can be omitted, for example, when the number of the remote devices required for installation can be sufficiently satisfied even with a single head end device 10, or when a plurality of head end devices 10 are installed.

Each node in the distributed antenna system (DAS) and its function will be described in more detail. First, the head end apparatus 10 can serve as an interface with a base station. 1, the head end apparatus 10 is connected to first to nth base stations (BTS # 1 to #n, where n is a natural number of 2 or more) corresponding to different operators, 10) may be connected to a service provider's service frequency band or a base station for each sector.

Generally, since a radio frequency (RF) signal transmitted from a base station is a high power signal, the head end apparatus 10 can convert such high power RF signal into a signal suitable for processing at each node have. The head end apparatus 10 can lower RF signals of high power for each frequency band or for each sector with low power. The head end apparatus 10 can combine a low power RF signal and serve to distribute the combined signal to the expansion apparatus 20 or the remote apparatus 30. [

The extension device 20 can transmit the combined signal to the remote device 40 connected to the expansion device 20. [

Each of the remote devices 30 and 40 can separate the transmitted combined signals by frequency bands and perform signal processing such as amplification. Accordingly, each of the remote devices 30 and 40 can transmit a base station signal to a user terminal in its service coverage through a service antenna (not shown).

1, a plurality of base stations (BTSs # 1 to #n) and a head end apparatus 10 are mutually connected to each other through an RF cable, However, the signal transmission medium between each node may be variously modified.

For example, at least one of between the head end device 10 and the expansion device 20, between the head end device 10 and some remote devices 30, between the expansion device 20 and some other remote devices 40 May be implemented in a manner that they are connected through an RF cable, a twisted cable, a UTP cable, etc. in addition to the optical cable.

However, the following description will be made with reference to Fig. Therefore, in the distributed antenna system (DAS), the head end device 10, the expansion device 20, and the remote devices 30 and 40 include an optical transceiver module for transmitting / receiving a light type signal through electro- And may include a WDM (Wavelength Division Multiplexing) element when connected between nodes by a single optical cable.

The DAS may be connected to an external management device (not shown) such as a Network Management Server (NMS) or a Network Operation Center (NOC) through a network. Accordingly, the manager can remotely monitor the status and problem of each node of the distributed antenna system, and control the operation of each node remotely.

2 is a view schematically showing a part of a head end apparatus according to an embodiment of the present invention. In the description of FIG. 2, for convenience of explanation, FIG. 1 will be described together.

2, the head end apparatus 10 includes first to nth base station interface units 11_1 to 11_n (where n is a natural number of 2 or more), a head end combining / distributing unit 12, End optical transmission / reception units 13_1 to 13_m, where m is a natural number of 2 or more, and a head end control unit 14. [

Each of the first to nth base station interface units 11_1 to 11_n may be connected to a corresponding one of the first to nth base stations BTS # 1 to #n. However, the present invention is not limited to this, and in another embodiment, at least two of the first to nth base station interface units 11_1 to 11_n may include any one of the first to n < th & And may be connected to one base station.

Each of the first to nth base station interface units 11_1 to 11_n may receive a downlink RF signal from a corresponding one of the first to nth base stations BTS # 1 to #n. The downlink RF signals received by the first to nth base station interface units 11_1 to 11_n may have different frequency bands.

Each of the first to n < th > base station interface units 11_1 to 11_n may adjust the power of the inputted downlink RF signal and output it to the head end combining / distributing unit 12. [ For example, each of the first to n < th > base station interface units 11_1 to 11_n may reduce the power of the inputted downlink RF signal and may transmit the power reduced downlink RF signal to the head end combining / distributing unit 12 Can be output.

Each of the first to n < th > base station interface units 11_1 to 11_n may receive a plurality of uplink transmission signals combined from the headend combining / distributing unit 12. [ Here, the combined plurality of uplink transmission signals are signals that are transmitted from the first to m-th head end optical transmission / reception units 13_1 to 13_m, which will be described later, to the head end combining / distributing unit 12 . Each of the uplink transmission signals is transmitted from the user terminals to the remote device 40 connected to the head end device 10 through the remote device 30 or the expansion device 20 directly connected to the head end device 10 And may include uplink RF signals of different frequency bands received. Each of the first to n < th > base station interface units 11_1 to 11_n extracts an uplink RF signal corresponding to a preset frequency band (e.g., a frequency band of the inputted downlink RF signal) from a plurality of combined uplink transmission signals can do.

Each of the first to n < th > base station interface units 11_1 to 11_n may adjust the power of the extracted uplink RF signal and output it to the corresponding base station. For example, each of the first to n < th > base station interface units 11_1 to 11_n may increase the power of the extracted uplink RF signal and output the power-increased uplink RF signal to the corresponding base station.

The head end combining / distributing unit 12 may combine downlink RF signals output from the first to n < th > base station interface units 11_1 to 11_n. Hereinafter, the combined downlink RF signals are referred to as downlink transmission signals. The head end combining / distributing unit 12 may distribute the downlink transmission signals to the first to m headend optical transmitting / receiving units 13_1 to 13_m.

The head end combining / distributing unit 12 may combine the uplink transmission signals output from the first to m head end optical transmitting / receiving units 13_1 to 13_m. The head end combining / distributing unit 12 may distribute the combined uplink transmission signals to the first to n < th > base station interface units 11_1 to 11_n.

According to an embodiment, the head end combining / distributing unit 12 may transmit an extension control signal, a remote control signal, a status information request signal, a delay measurement signal, and the like transmitted from the head end control unit 14 to the downlink RF signal To generate the downlink transmission signal. Here, the extended control signal may be a signal for controlling the expansion device 20, and the remote control signal may be a signal for controlling the remote device 30, 40. The status information request signal may be a signal for requesting information on the downlink power, uplink power, abnormality occurrence, etc. with respect to the expansion device 20 or the remote devices 30 and 40. The delay measurement signal may be a signal for measuring the delay between the head end apparatus 10 and the expansion apparatus 20 or between the head end apparatus 10 and the remote apparatuses 30 and 40.

Alternatively, the head end combining / distributing unit 12 can separate a state information signal, a delay response signal, and the like transmitted from the expansion device 20 or the remote device 30 from the uplink transmission signals, An information signal, a delay response signal, and the like to the head-end control unit 14. Here, the status information signal and the delay response signal may be signals transmitted by the extension device 20 or the remote device 30 in response to the status information request signal and the delay measurement signal, respectively.

The head end combining / distributing unit 12 may include a signal converting apparatus such as a modem, and the predetermined control signal or the like described above may be combined with the downlink RF signals through the signal converting apparatus To be transmitted to the expansion device 20 and / or the remote device 30 and the status information signal from the expansion device 20 and / or the remote device 30 can be processed by the head end control section 14 .

Each of the first to m-th head end optical transmitters / receivers 13_1 to 13_m can convert the input downlink transmission signal into an electrical signal to generate a downlink optical signal. Each of the first to mth headend optical transceivers 13_1 to 13_m may transmit the generated downlink optical signal to the expansion device 20 or the remote device 30 through the corresponding optical transmission medium.

Each of the first to mth headend optical transceivers 13_1 to 13_m may receive the uplink optical signal from the expansion device 20 or the remote device 30 via the corresponding optical transmission medium. Each of the first to m-th head end optical transceivers 13_1 to 13_m can convert the inputted uplink optical signal into the uplink transmission signal by photoelectric conversion. Each of the first to m-th head end optical transmission / reception units 13_1 to 13_m may output the restored uplink transmission signal to the head end combining / distributing unit 12.

At least one of the first to mth head end optical transceivers 13_1 to 13_m may be configured to transmit the extended control signal, the remote control signal, the status information The request signal, the delay measurement signal, and the like, together with the input downlink transmission signal, to generate the downlink optical signal.

Alternatively, at least one of the first to m headend optical transceivers 13_1 to 13_m converts the input uplink optical signal by photoelectric conversion and then transmits the status information transmitted from the expansion device 20 or the remote device 30 The delay response signal, and the like from the uplink transmission signal, and the separated state information signal, the delay response signal, and the like can be transmitted to the head end control unit 14. [

At least one of the first to m-th head end optical transceivers 13_1 to 13_m may include a signal conversion device such as a modem, and the predetermined control signal, etc., And can be processed so as to be forwarded to the expansion device 20 and / or the remote device 30 together with the downlink transmission signal, and processed such that the status information signal or the like from the expansion device 20 and / Can be processed by the head end control section 14 to be used.

The head end control unit 14 may control and / or monitor at least one of the first to nth base station interface units 11_1 to 11_n and the first to mth head end optical transmission / reception units 13_1 to 13_m.

The head-end control unit 14 can receive a head-end control signal from an external device, for example, an NMS communicatively connected through a network, a terminal of an administrator, and the like. In response to the head-end control signal, At least one of the base station interface units 11_1 to 11_n and the first to mth headend optical transceivers 13_1 to 13_m can be controlled and / or monitored. Here, the link between the head end control unit 14 and the external device may be, for example, an Ethernet link, but the technical idea of the present invention is not limited to this, and any type of link can be used.

The head end control unit 14 can generate a status information signal for at least one of the first to nth base station interface units 11_1 to 11_n and the first to mth head end optical transmitting / receiving units 13_1 to 13_m , And transmit the generated state information signal to the external device.

The head end control unit 14 outputs predetermined signals generated by itself or transmitted from the external apparatus, for example, the above-described extended control signal, remote control signal, status information request signal, delay measurement signal, To the distribution unit 12 or the first to mth headend optical transceivers 13_1 to 13_m so that the predetermined signals are transmitted to the expansion device 20 and / or the remote device 30. [

The head end control unit 14 receives status information of the expansion device 20 and / or the remote device 30 from the head end combining / distributing unit 12 or the first to mth head end optical transmitting / receiving units 13_1 to 13_m, Signal, a delay response signal, and the like. The head-end control unit 14 can perform state analysis, delay measurement, and the like of the corresponding apparatus based on the transmitted signals. The head-end control unit 14 may transmit a status information signal or the like, which is transmitted from the expansion device 20 and / or the remote device 30, to the external device through the above-described Ethernet link or the like.

The head end control unit 14 may include, for example, a signal conversion device such as a modem, and the control signal and the like can be processed through the signal conversion device so that the corresponding configuration can be used or can be used by the user have.

The head end control unit 14 is connected to at least one of the first to nth base station interface units 11_1 to 11_n, the head end combining / distributing unit 12 and the first to mth head end optical transmitting / receiving units 13_1 to 13_m Or the frequency spectrum of the input and / or output signals. In this case, the head-end control unit 14 may have a configuration for spectral analysis. However, it goes without saying that the configuration for spectral analysis may be implemented separately from the head-end control unit 14. The head-end control unit 14 adjusts the power of the downlink RF signals based on the result of monitoring the frequency spectrum of the downlink RF signals input to the first to nth base station interface units 11_1 to 11_n, It can evenly distribute limited transmission resources between the base station 10 and the remote device 30 for each of the downlink RF signals.

FIG. 3 is a view schematically showing a part of an expansion device according to an embodiment of the present invention. In the description of FIG. 3, for convenience of explanation, FIG. 1 will be described together.

3, the extension device 20 may include a first extended optical transmission / reception unit 21, an extended processing unit 22, a second extended optical transmission / reception unit 23, and an extended control unit 24.

The first extended optical T / R section 21 can receive the downlink optical signal from the head end apparatus 10. The first extended optical T / R section 21 converts the inputted downlink optical signal into an electrical signal, restores it to a downlink transmission signal generated by the head end apparatus 10, and outputs the restored downlink transmission signal to the extension processing section 22).

The first extended optical T / R section 21 converts the uplink transmission signal subjected to predetermined signal processing by the extension processing section 22 into a signal generated by the remote device 40, and converts it into an uplink optical signal , And can transmit the converted uplink optical signal to the head end apparatus (10).

The first extended optical T / R section 21 separates the extended control signal, the status information request signal, the delayed measurement signal, and the like from the downlink transmission signal and transmits it to the extension control section 24, A delay response signal, and the like of the extension device 20, which are transmitted from the base station 20, 24, and the like, to the uplink transmission signal.

The first extended optical T / R section 21 may include, for example, a signal conversion device such as a modem, and may process the control signal or the like using the signal conversion device or the like.

The extension processing unit 22 can process the inputted downlink transmission signal by signal processing such as amplification and output it to the second extended optical transmission / reception unit 23. The extended processing unit 22 processes the inputted uplink transmission signal by signal processing such as amplification, To the optical transmitter / receiver (21). This is because when the head end apparatus 10 and some remote apparatuses 40 are connected to each other through the expansion apparatus 20, the transmission path of the signal, as compared with the case where the head end apparatus 10 and the other remote apparatus 30 are directly connected, The extension processing unit 22 re-amplifies the downlink transmission signal and the uplink transmission signal to a predetermined level in order to secure the quality of service and the like.

According to an embodiment, the extension processing unit 22 separates the extension control signal, the status information request signal, the delay measurement signal, and the like from the downlink transmission signal and transmits the separated control signal, the delay measurement signal and the like to the extension control unit 24, A delay measurement signal for the remote device 40 transmitted from the mobile station 40 may be included in the downlink transmission signal.

Alternatively, the extension processing section 22 may separate the delay response signal and the like transmitted from the remote device 40 from the uplink transmission signal and transmit the delay response signal to the extension control section 24, 20, a delay response signal, and the like can be included in the uplink transmission signal.

The extension processing unit 22 may include, for example, a signal conversion device such as a modem, and may process the control signal or the like using the signal conversion device.

The second extended optical transmitter / receiver 23 can convert the downlink transmission signal subjected to the signal processing by the extension processor 22 into a downlink optical signal, and transmit the converted downlink optical signal to the remote device 40 ).

The second extended optical T / R section 23 can combine the uplink optical signals transmitted from the remote device 40 and convert the optical signals into an uplink transmission signal by photoelectrically converting them. The extended optical transmission / .

The second extended optical transmission and reception unit 23 may transmit the delay measurement signal or the like to the remote device 40 transmitted from the extension control unit 24 to the extension processing unit 22, So that the downlink optical signal can be generated. Alternatively, the second extended optical T / R section 23 can separate the uplink optical signal inputted thereto and convert it into an uplink transmission signal and a delay response signal transmitted from the remote device 40 after photoelectric conversion, The transmission signal may be output to the extension processing unit 22 and the separated delay response signal may be transmitted to the extension control unit 24.

The second extended optical T / R section 23 may include a signal conversion device such as a modem, for example, and may process the delay measurement signal or the like using the signal conversion device.

3, the extension device 20 includes only one second extended optical T / R section 23. However, the technical idea of the present invention is not limited thereto, and the extension device 20 May include at least two or more extended optical transceivers. In this case, the extension processing section 22 distributes the amplified downlink transmission signal to the plurality of second extended optical transmission / reception sections 23, or distributes the uplink transmission signal transmitted from the plurality of second extended optical transmission / And then amplify the signals.

The extension control unit 24 can control the first extended optical transmission / reception unit 21, the extended processing unit 22 and the second extended optical transmission / reception unit 23, and the first extended optical transmission / reception unit 21, 22) and the second extended optical T / R section (23).

The extension control unit 24 can identify the extension control signal, the status information request signal, the delay measurement signal, and the like transmitted from the head end apparatus 10 through the first extended optical transmission / reception unit 21 or the extended processing unit 22 And may respond to these to control internal configurations or generate status information signals, delay response signals, and the like. The extension control unit 24 transmits the status information signal and the delay response signal of the generated extension device 20 to the first extended optical transmission / reception unit 21 or the extended processing unit 22 so as to be transmitted to the head end device 10 can do.

The extension control unit 24 may transmit the delay measurement signal for the remote device 40 to the extension processing unit 22 or the second extended optical transmission and reception unit 23 to be transmitted to the remote device 40, The delay between the expansion device 20 and the remote device 40 may be measured based on the delay response signal transmitted from the remote device 40 via the first extended optical transmission / reception section 22 or the second extended optical transmission / reception section 23.

The extension control unit 24 may include, for example, a signal conversion device such as a modem, and the control signal or the like may be processed through the signal conversion device so as to be used in a corresponding configuration or by itself.

Meanwhile, the extension control unit 24 may be directly connected to an external device such as an NMS, an administrator's terminal, or the like, which is connected through a network, and receives an extension control signal or the like transmitted from the external device and transmits the extension control signal to the first and second extended optical transmission / 21, and 23, and the extension processing unit 22. [ The extension control unit 24 may directly transmit the status information signals of the first and second extended optical T / R units 21 and 23 and the extension processing unit 22 to the external device.

FIG. 4 and FIG. 5 are views schematically showing a part of a configuration of a remote device according to an embodiment of the present invention. 4 shows a case where the remote device 30 includes both the first to n-th band processing units 33_1 to 33_n and the first to the n-th downlink / UL uplink branching units 34_1 to 34_n FIG. 5 exemplarily shows a case where the remote device 30 includes only a part of the band processing section and the corresponding DL / UL branching section. 4 and FIG. 5 will be described as an example of the remote device 30 shown in FIG. 1, but the remote device 40 shown in FIG. 1 is also shown in FIGS. 4 and 5 Of course, correspond to a remote device. In the description of FIG. 4 and FIG. 5, for convenience of description, FIG. 1 will be described together, and a description overlapping with FIG. 1 will be omitted.

4, the remote device 30 includes a remote optical transmission / reception unit 31, an interface unit 32, first to nth band processing units 33_1 to 33_n, first to nth DL / UL branching units A remote control unit 36, a remote power supply unit 37, and an antenna 38. The remote control unit 36 includes a remote control unit 34-1 to 34_n, a remote coupling / distribution unit 35, a remote control unit 36,

The remote optical transmitting / receiving unit 31 can receive the downlink optical signal from the head end apparatus 10 and photoelectrically convert the received downlink optical signal into a downlink transmission signal. The remote optical transmitting / receiving unit 31 may output the downlink transmission signal to the interface unit 32. [

The remote optical transmitting / receiving unit 31 can receive the uplink transmission signal output from the interface unit 32 and can convert the inputted uplink transmission signal into the uplink optical signal. The remote optical transmitting / receiving unit 31 can transmit the uplink optical signal to the head end apparatus 10. [

According to the embodiment, the remote optical transmitting / receiving unit 31 can separate the remote control signal, the delay measurement signal, and the like from the downlink transmission signal and output the downlink transmission signal to the interface unit 32 The separated remote control signal, the status information request signal, the delay measurement signal, and the like can be transmitted to the remote control unit 36.

Alternatively, the remote optical transmitting / receiving unit 31 may convert the status information signal or the like transmitted from the remote control unit 36 together with the uplink transmission signal to generate the uplink optical signal.

The remote optical transceiver 31 may include, for example, a signal converter such as a modem, and the remote control signal, the delay measurement signal, and the like may be used by the remote controller 36 through the signal converter So that the status information signal or the like can be processed so as to be electro-optically converted together with the uplink transmission signal.

The remote optical transmitting / receiving unit 31 may be implemented in a modular structure, and at least a part of the internal configurations of the remote optical transmitting / receiving unit 31 may be implemented in a modular structure.

The interface unit 32 can output the inputted downlink transmission signal along a predetermined downlink path.

The downlink path may be set such that the downlink transmission signal is transmitted to the most advanced band processing unit on the premise of the connection state of the interface unit 32 and the first to nth band processing units 33_1 to 33_n. For example, when the interface unit 32 and the first through n-th band processing units 33_1 through 33_n are all connected, the downlink path is a downlink path in which the downlink transmission signal is transmitted to the first band- (33_1).

The downlink path may be reset according to the connection state change of the interface unit 32 and the first to nth band processing units 33_1 to 33_n. For example, as shown in FIG. 5, the downlink path is disconnected from the interface unit 32 and the first band processing unit 33_1, and the interface unit 32, the second band processing unit 33_2, When the connection of the 3-band processing unit 33_3 is maintained, the downlink transmission signal can be reset so as to be transmitted to the second band processing unit 33_2 which is the band processing unit in the front end in the current state.

The interface unit 32 may output the input uplink transmission signal along a predetermined uplink path.

The uplink path may be set and reset in response to the downlink path described above. For example, when the interface unit 32 and the first to the n-th band processing units 33_1 to 33_n are all connected, the uplink path may be configured such that the interface unit 32 is connected to the first band- Receiving section 33_1 to transmit the uplink transmission signal to the remote optical transmitting / receiving section 31. [ 5, the interface unit 32 and the first band processing unit 33_1 are disconnected from each other, and the interface unit 32, the second band processing unit 33_2, and the third band When the connection of the processing unit 33_3 is maintained, the interface unit 32 receives the uplink transmission signal from the second band processing unit 33_2, which is the most advanced band processing unit in the current state, and transfers it to the remote optical transmission / reception unit 31 Can be reset.

The interface unit 32 is communicatively connected to the remote optical transmission / reception unit 31, the first to nth band processing units 33_1 to 33_n, the remote control unit 36 and the remote power supply unit 37, And an interface board that enables transmission and reception of the data.

The first to n-th band processing units 33_1 to 33_n transmit the downlink transmission signals output from the interface unit 32 from the front end to the rear end and transmit the uplink RF signals from the rear end to the front end, In a cascade configuration.

In the downlink, the first band processing unit 33_1 transmits the downlink transmission signal input from the interface unit 32 to the second band processing unit 33_1 in a cascade structure, Band processing unit 33_2 and the second band processing unit 33_2 transmits the downlink transmission signal transmitted from the first band processing unit 33_1 to the third band processing unit 33_3. In the uplink, the third band processing unit 33_3 transfers its uplink RF signal to the second band processing unit 33_2, and the second band processing unit 33_2 transmits the uplink RF signal of the third band processing unit 33_3 And transmits the uplink RF signal of the second and third band processing units 33_2 and 33_3 coupled to the first band processing unit 33_1 to the first band processing unit 33_1 And outputs it to the interface unit 32 as an uplink transmission signal in combination with its uplink RF signal.

Each of the first to n < th > band processing units 33_1 to 33_n outputs a downlink RF signal of a corresponding frequency band of a plurality of downlink RF signals of different frequency bands included in the inputted downlink transmission signal, Signal processing can be performed. Each of the first to n-th band processing units 33_1 to 33_n can output the signal processed downlink RF signal to the corresponding DL / UL branching unit of the first to n-th DL / UL branching units 34_1 to 34_n.

Each of the first to n-th band processing units 33_1 to 33_n transmits a signal such as an amplification signal to the uplink RF signal transmitted from the corresponding DL / UL branching unit of the first to the nth DL / UL branching units 34_1 to 34_n Processing can be performed. Each of the first to n < th > band processing units 33_1 to 33_n may combine the signal-processed uplink RF signal transmitted from the subsequent stage with the uplink RF signal processed by the first to n & In this case, the rearmost band processing unit may transmit only the uplink RF signal processed by itself to the band processing unit of the previous stage, and the most upstream band processing unit may process the combined uplink RF signal transmitted from the following band processing unit And outputs it to the interface unit 32 as an uplink transmission signal in combination with an uplink RF signal.

Each of the first to n-th band processing units 33_1 to 33_n may be implemented in a modular structure, and at least some of the internal configurations of the first to n-th band processing units 33_1 to 33_n may also be implemented in a modular structure . The detailed configuration of the first to n < th > band processing units 33_1 to 33_n will be described in more detail below with reference to Figs. 6 to 9. Fig.

Each of the first through n-th DL / UL branching sections 34_1 through 34_n may be connected to a corresponding one of the first through n-th band processing sections 33_1 through 33_n. Each of the first to the n-th DL / UL branching sections 34_1 to 34_n may be implemented as a modular structure. In this case, each of the first to n- 1 to n-th band processing units 33_1 to 33_n, or may be implemented as separate modules.

Each of the first to nth DL / UL branching sections 34_1 to 34_n can receive a downlink RF signal output from the connected band processing section. Each of the first to nth DL / UL branching sections 34_1 to 34_n may remove noise and the like of the inputted downlink RF signal and transmit the same to the remote combining / distributing section 35. [

Each of the first to nth DL / UL branching sections 34_1 to 34_n can extract the uplink RF signal of the frequency band required for the connected band processing section from the uplink signal transmitted from the remote combining / distributing section 35 And transmit the extracted uplink RF signal to the connected band processing unit.

Each of the first to nth DL / UL branching sections 34_1 to 34_n may be implemented as a duplexer, for example.

The remote combining / distributing unit 35 transfers the downlink RF signals output from the first to the nth DL / UL branching units 34_1 to 34_n to the antenna 38 so as to be transmitted to the user terminal. The remote combining / distributing unit 35 may distribute the uplink RF signals of the user terminal received through the antenna 38 to the first to the n-th DL / UL branching units 34_1 to 34_n.

In this way, even when the interface unit 32 of the remote device 30 changes the connection state of the first to n < th > band processing units 33_1 to 33_n, the transmission path of the signal is automatically changed, The processing units 33_1 to 33_n are connected in a cascade structure for transmitting a downlink transmission signal to each other and the first to the n-th band processing units 33_1 to 33_n and the first to the n-th DL / UL branching units 34_1 to 34_n Modular structure, it is possible to replace or remove only the bandwidth processing part and the DL / UL branching part, which are required by the administrator, for the change of the operation environment of the distributed antenna system (DAS) such as addition of the service frequency band, It is possible to easily cope with the maintenance method, and the operational convenience of the manager, the flexibility and the scalability of the distributed antenna system can be improved.

With reference to FIG. 5, the improved convenience, flexibility, and scalability effects of the remote device 30 are described in greater detail.

As shown in FIG. 4, the remote device 30 may be configured to support the services of the first through n-th base stations BTS # 1 through #n through the first through nth band processing units 33_1 through 33_n. The first and second base stations BTS # 1 to BTS # 1 and BTS # 2 to BTS # 3 and # 4 are not operated because of an error in the service of the first base station BTS # , And BTS # 3) is required.

In this case, a remote device of a general distributed antenna system must be replaced with a new device whose service is stopped and the signal path design between the bandwidth processing units connected to the optical transmission / reception unit is changed.

However, as shown in FIG. 5, the remote device 30 according to the technical idea of the present invention includes the first band processing section 33_1, the fourth to nth band processing sections 33_4 to 33_n, and the corresponding DL / By separating the parts from the remote device 30, it is possible to cope with a failure and a change in the operating environment. In the remote device 30, only the band processing unit of the frontmost stage is connected to the interface unit in a state where the modular type band processing units are connected to each other in a cascade structure without being connected to the remote optical transmission / reception unit, so that some band processing units are separated, This is because there is no need to redesign or change the configurations of the signal path and signal processing between the remote optical transmission / reception unit and the band processing unit. Accordingly, it is possible to easily cope with a failure and change of operation through separation, replacement or addition of only a band processing unit, thereby improving management convenience and improving the flexibility and scalability of the distributed antenna system.

Referring again to FIG. 4, the remote combining / distributing unit 35 may combine the downlink RF signals output from the first to the nth DL / UL branching units 34_1 to 34_n and transmit the combined downlink RF signals to the antenna 38. [ The remote combining / distributing unit 35 can receive the uplink signals transmitted from the user terminal through the antenna 38 and transmits the uplink signals to the first to the nth DL / UL branching units 34_1 to 34_n Can be distributed.

The remote control unit 36 can control the remote optical transmission / reception unit 31 and the first to nth band processing units 33_1 to 33_n. For example, the remote control unit 36 may generate first through n-th control signals for controlling the first through n-th band processing units 33_1 through 33_n, (32). In this case, the interface unit 32 may transmit the input first to n-th control signals to the corresponding one of the first to n-th band processing units 33_1 to 33_n.

According to the embodiment, the remote control unit 36 generates the first to the n-th control signals based on the remote control signal transmitted from the head end apparatus 10 and outputs the control signals to the remote optical transmission / reception unit 31 and the first to and the n-band processing units 33_1 to 33_n. Alternatively, the remote control unit 36 may directly control the remote optical transmission / reception unit 31 and the first to nth band processing units 33_1 to 33_n using the remote control signal.

According to another embodiment, the remote control unit 36 may be directly connected to an external device such as an NMS, an administrator terminal, or the like, which is connected via a network, n control signals to control the remote optical transmitting / receiving unit 31 and the first to nth band processing units 33_1 to 33_n. Alternatively, the remote control unit 36 may directly control the remote optical transmission / reception unit 31 and the first to nth band processing units 33_1 to 33_n by directly using the remote control signal transmitted from the external device.

The remote control unit 36 can monitor the operation states of the remote optical transmission / reception unit 31 and the first to nth band processing units 33_1 to 33_n. The remote control unit 36 may also analyze the frequency spectrum of the signals in the first to nth band processing units 33_1 to 33_n through a spectrum monitoring part 3336 to be described later.

The remote control unit 36 may include, for example, a signal conversion device such as a modem, and the status information request signal, the delay measurement signal, and the like transmitted from the head end device 10 through the signal conversion device Can be processed. The remote control unit 36 can generate a state information signal, a delay response signal, and the like in response to the processed state information request signal, delay measurement signal, and the like. The remote control unit 36 can process the generated status information signal, delay response signal, and the like to be transmitted to the head end apparatus 10 through the remote optical transmission / reception unit 31 using the signal conversion apparatus. Meanwhile, the remote control unit 36 may transmit the generated status information signal, delay response signal, and the like to the external device.

The remote control unit 36 may be implemented in a modular structure, and at least a part of the internal configurations of the remote control unit 36 may also be implemented in a modular structure.

The remote power supply unit 37 may generate driving power for driving the remote optical transmission / reception unit 31 and the first to nth band processing units 33_1 to 33_n. For example, the remote power supply unit 37 may supply a driving power for driving the first to n-th band processing units 33_1 to 33_n based on the power supplied from an external power supply unit (not shown) or an internal supply unit And can output the generated driving power to the interface unit 32. [0053] In this case, the interface unit 32 may transmit the input driving power to the first through n-th band processing units 33_1 through 33_n, respectively.

The remote power supply unit 37 may be implemented in a modular structure, and at least a part of the internal configurations of the remote power supply unit 37 may also be implemented in a modular structure.

Figs. 6 to 9 are exemplary diagrams showing in detail some configurations of the band processing units shown in Fig. 6 to 9 illustrate that the first to nth band processors 33_1 to 33_n correspond to each other. However, the technical idea of the present invention is not limited thereto, At least two or more of the first to third subfields 33_1 to 33_n may have different configurations. Hereinafter, for convenience of explanation, the first to n-th band processing units 33_1 to 33_n have the same configuration, but the first band processing unit 33_1 will be mainly described. 6 to 9, the description will be made with reference to FIG. 4, but redundant contents will be omitted and differences will be mainly described.

6 and 7, the first band processing unit 33_1 may include an RF processing unit 331_1 and a digital processing unit 333_1. Here, the RF processing unit 331_1 and / or the digital processing unit 333_1 may be implemented in a modular structure.

The RF processing section 331_1 may include a distribution part 3311, an extraction / conversion part 3312, a DL amplification part 3313, a UL amplification part 3314 and a combining part 3315. [

The distribution part 3311 distributes the downlink transmission signal output from the interface part 32 to the extraction / conversion part 3312 and the downstream band processing part, more specifically, the distribution part of the second band processing part 33_2 . When the connection between the first band processing unit 33_1 and the second band processing unit 33_2 is released and the first band processing unit 33_1 and the third band processing unit 33_2 are connected, 3311 may transmit the downlink transmission signal to the distribution part of the extraction / conversion part 3312 and the third band processing part 33_3.

Although not shown in FIGS. 6 and 7, the distribution part 3311 may include an amplifier, and the amplifier may be used to compensate for losses due to the distribution of the downlink signal. Depending on the implementation, the amplifier may be implemented as a separate module from the distribution part 3311. [

On the other hand, the distribution part in the rearmost band processing section (i.e., the n-th band processing section 33_n) changes the downlink transmission signal transmitted from the band processing section (i.e., the (n-1) th band processing section 33_n- It can be transmitted only to the corresponding extraction / conversion part without being distributed to the band processing part.

The extraction / conversion part 3312 can pass downlink RF signals of a corresponding frequency band among a plurality of frequency bands included in the transmitted downlink transmission signal. The extraction / conversion part 3312 can IF (Intermediate Frequency) convert the extracted downlink RF signal and output it to the digital processing part 333_1.

The DL amplification part 3313 is subjected to a predetermined digital processing, for example, a CFR part (hereinafter referred to as CFR 3332) and subjected to predistortion reduction processing by the digital processing part 333_1 and to predistortion processing by a PD part It is possible to amplify the downlink RF signal. The DL amplification part 3313 may include, for example, a high output amplifier. The DL amplification part 3313 can output the amplified downlink RF signal to the first DL / UL branch part 34_1.

The UL amplification part 3314 can amplify the uplink RF signal transmitted from the first DL / UL branch part 34_1 and output the amplified uplink RF signal to the combining part 3315. The UL amplification part 3314 may comprise, for example, a low noise amplifier.

The combining part 3315 combines the uplink RF signal amplified by the UL amplification part 3314 and the uplink RF signal transmitted after the amplification processing in the band processing part (i.e., the second band processing part 33_2) in the subsequent stage Thereby generating an uplink transmission signal. The combining part 3315 can transmit the generated uplink transmission signal to the interface part 32. [ Since the first band processing section 33_1 is disposed at the foremost end, the uplink transmission signal generated by the combining part 3315 is transmitted to the rear end of the first band processing section 33_1 of the second to nth band processing sections 33_2 to 33_n The uplink RF signals of all the frequency bands processed by the band processing units connected to the uplink RF signals will be included.

6 and 7, the coupling part 3315 may include an amplifier, and the uplink RF signal output from the UL amplification part 3314 and the second RF signal output from the second band processing part 33_2, It is possible to compensate for the loss due to the combination of the uplink RF signal transmitted from the combining part of the uplink RF signal. In addition, the combining part 3315 may include an attenuator, and the attenuator may be used to adjust the gain of the uplink RF signal transmitted from the combining part of the second band processing part 33_2. Depending on the implementation, the amplifier and / or the attenuator may be implemented as a separate module from the coupling part 3315.

In the meantime, since the band processing unit of the rearmost band processing unit (i.e., the nth band processing unit 33_n) is not connected to the rear end, only the uplink RF signal, As shown in FIG.

The digital processing unit 333_1 includes a digital conversion and analog conversion part (ADC / DAC) 3331, a CFR 3332 and a PD 3333, a PIMD measurement part (hereinafter referred to as a PIMD 3334), a VSWR measurement part And a spectrum monitoring part (hereinafter SM, 3336). Depending on the implementation, the CFR 3332 and the PD 3333 may be implemented as an integrated module and may be separated in the digital processing unit 333_1.

The ADC / DAC 3331 can digitize the IF-converted downlink RF signal transmitted from the extraction / conversion part 3312 of the RF processing unit 331_1. The ADC / DAC 3331 can analogize the digitized downlink RF signal subjected to the crest factor reduction process and the predistortion process and output it to the DL amplification part 3313 of the RF processing unit 331_1. The ADC / DAC 3331 can provide a signal conversion function between the PIMD 3334, the VSWR 3335, and the SM 3336 and the RF processor 331_1 upon signal transmission. In FIG. 7, the ADC / DAC 3331 is illustrated as being implemented as a single module, but it goes without saying that the ADC for digital conversion and the DAC for analog conversion can be configured as separate modules.

The CFR 3332 may perform the crest factor reduction process on the digitized downlink RF signal. The crest factor reduction process can be performed using, for example, PC-CFR (peak cancellation crest factor reduction).

The PD 3333 may perform the predistortion processing to compensate the linearity of the DL amplification part 3313 for the downlink RF signal subjected to the crest factor reduction processing.

The PIMD 3334 can generate a predetermined test signal and can measure the degree of manual intermodulation distortion by the RF processor 331_1 using the generated test signal. For example, the PIMD 3334 transmits a test signal for a specific frequency band of the RF processing unit 331_1 to the RF processing unit 331_1, and an intermodulation (IM) processing unit 331_1 outputs the test signal in response to the test signal. ) Signal to determine the degree of passive intermodulation distortion.

The VSWR 3335 can measure the voltage standing wave ratio on the internal signal path of the RF processor 331_1. For example, the VSWR 3335 may measure the voltage standing wave ratio at the input or output of at least one of the distribution part 3311, the extraction / conversion part 3312 and the DL amplification part 3313. In addition, the VSWR 3335 can measure the voltage-standing wave ratio at the input or output terminal of at least one of the UL amplification part 3314 and the coupling part 3315. [

The SM 3336 can monitor the frequency spectrum of various signals on the internal signal path of the RF processor 331_1. For example, the SM 3336 may monitor the spectrum of the downlink RF signal at the input or output of at least one of the distribution part 3311, the extraction / conversion part 3312 and the DL amplification part 3313. The SM 3336 may also monitor the spectrum of the uplink RF signal at the input or output of at least one of the UL amplification part 3314 and the combining part 3315.

7, the RF processing unit 331_1 and the digital processing unit 33_1, as in the embodiment shown in FIG. 7, will be described with reference to FIGS. 6 and 8. FIG. DAC 3331, PIMD 3334, and VSWR 3334, except for the CFR 3332 and the PD 3333, the digital processing unit 333_1, unlike the embodiment shown in FIG. 7, 3335 and SM 3336, respectively. The embodiment shown in Fig. 8 exemplifies a case where the CFR 3332 and the PD 3333 are separated from the digital processing unit 333_1.

In this case, the DL amplification part 3313 of the RF processing part 331_1 in the first band processing part 33_1 shown in FIG. 8 directly amplifies the downlink RF signal extracted by the extraction / conversion part 3312, And output it to the DL / UL branching unit 34_1.

Next, another embodiment of the first band processing unit 33_1 will be described with reference to FIG. 9. The first band processing unit 33_1, unlike the embodiments shown in FIGS. 7 and 8, .

In this case, the first band processing section 33_1 shown in FIG. 9 is different from the first embodiment shown in FIGS. 7 and 8 in that the extraction part 3316 includes a plurality of frequency bands included in the downlink transmission signal transmitted from the distribution part 3311 The downlink RF signal of the corresponding frequency band can be passed and the DL amplification part 3313 amplifies the downlink RF signal extracted from the extraction part 3316 and outputs the amplified downlink RF signal to the first DL / UL branch part 34_1 .

As described above, the RF processing unit 331_1 and / or the digital processing unit 333_1 are implemented in a modular structure, and at least a part of the configurations in the digital processing unit 333_1 are modularized so that the remote device 30 can be distributed The first to n < th > band processing units 33_1 to 33_n can be configured variously according to the operating environment required for the antenna system.

10 to 12 are views schematically showing a part of a configuration of a remote device according to another embodiment of the present invention. FIGS. 10 to 12 show modifications of the embodiment shown in FIG. 4. Therefore, for convenience of description, FIG. 4 will be described together with reference to FIG. 4, but duplicated description will be omitted and differences will be mainly described.

10, the remote device 30a includes a remote optical transmission / reception unit 31, an interface unit 32, first to nth band processing units 33_1 to 33_n, first to nth DL / A remote control unit 36, a remote power supply unit 37, first and second antennas 38_1 and 38_2, and the like. For example, unlike the remote device 30 shown in Fig. 4, the remote device 30a may include a plurality of antennas.

The remote combining / distributing unit 35 may be connected to the first and second antennas 38_1 and 38_2 and may combine the downlink RF signals output from the first to the nth DL / UL branching units 34_1 to 34_n And can distribute the combined downlink RF signal to the first and second antennas 38_1 and 38_2. In another embodiment, the remote combining / distributing unit 35 combines some downlink RF signals output from the first to the nth DL / UL branching units 34_1 to 34_n and transmits them to the first antenna 38_1, Some downlink RF signals may be combined and transmitted to the second antenna 38_2.

The remote combining / distributing unit 35 can receive the uplink signal transmitted from the user terminal through the first and second antennas 38_1 and 38_2, and transmits the uplink signal to the first through n-th DL / And can be distributed to bases 34_1 to 34_n.

11, the remote device 30b includes a remote optical transmission / reception unit 31, an interface unit 32, first to nth band processing units 33_1 to 33_n, first to nth DL / UL branching units 34_1 to 34_n, a remote control unit 36, a remote power supply unit 37, and first to nth antennas 38_1 to 38_n. For example, unlike the remote device 30 shown in Fig. 4, the remote combining / distributing part can be omitted in the remote device 30b.

Each of the first to nth DL / UL branching sections 34_1 to 34_n may be connected to a corresponding one of the first to n < th > antennas 38_1 to 38_n, And transmit a down-converted RF signal, such as an amplified signal, to the antenna.

Each of the first to nth DL / UL branching sections 34_1 to 34_n is connected to the uplink signal of the frequency band required for the band processing section connected in the uplink signal transmitted from the corresponding one of the first to nth antennas 38_1 to 38_n, The RF signal can be extracted and the extracted uplink RF signal can be transmitted to the connected band processing unit.

12, the remote device 30c includes a remote optical transmitting / receiving unit 31, an interface unit 32, first to nth band processing units 33_1 to 33_n, a remote combining / distributing unit 35, A remote power supply unit 37, and an antenna 38. [ For example, unlike the remote device 30 shown in Fig. 4, the first to the n-th DL / UL branching portions may be omitted in the remote device 30c. 12, one antenna 38 is shown connected to the remote combining / distributing unit 35. However, the present invention is not limited to this, and similarly to the remote device 30a shown in FIG. 10, May be connected to the remote combining / distributing unit 35. FIG. The remote combining and distributing unit 35 may be connected to the first to nth band processing units 33_1 to 33_n and may combine the downlink RF signals output from the first to nth band processing units 33_1 to 33_n, ). ≪ / RTI >

The remote combining / distributing unit 35 can receive the uplink signals transmitted from the user terminal through the antenna 38 and receive the uplink signals from the uplink signals to the first through n-th band processing units 33_1 through 33_n The uplink RF signal can be separated and the separated uplink RF signal can be transmitted to the corresponding one of the first to n < th > band processing units 33_1 to 33_n.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, This is possible.

10: Headend device
20: Expansion unit
30, 30a, 30b, 30c, 40: remote device

Claims (25)

As a remote device of a distributed antenna system,
A remote optical transceiver configured to convert the received downlink optical signal into a downlink transmission signal;
An interface unit configured to receive the downlink transmission signal from the remote optical transmission / reception unit and output the downlink transmission signal along a predetermined downlink path;
A first band configured to receive the downlink transmission signal from the interface unit and to amplify and output a first downlink RF signal of a plurality of downlink RF signals of different frequency bands included in the downlink transmission signal, A processor; And
A second band processing unit configured to receive the downlink transmission signal from the first band processing unit and to amplify and output a second downlink RF signal of the plurality of downlink RF signals included in the downlink transmission signal;
And a remote device.
The method according to claim 1,
Wherein the second band-
Amplifies the input second uplink RF signal and outputs the amplified second uplink RF signal to the first band processing unit,
Wherein the first band-
Amplifies the input first uplink RF signal, generates an uplink transmission signal based on the amplified first uplink RF signal and the amplified second uplink RF signal, and transmits the uplink transmission signal to the interface unit Output,
The interface unit includes:
Receiving the uplink transmission signal from the first band processing unit and outputting the uplink transmission signal along a predetermined uplink path,
The remote optical transmitter-
And receives the uplink transmission signal from the interface unit, and converts the uplink transmission signal into an uplink optical signal.
3. The method of claim 2,
The downlink path comprising:
The interface unit is reset to transmit the downlink transmission signal to the second band processing unit when the connection between the interface unit and the first band processing unit is released and the connection between the interface unit and the second band processing unit is maintained,
The uplink path comprising:
The interface unit and the first band processing unit are disconnected from each other, and when the interface unit and the second band processing unit are maintained in a connected state, the interface unit is configured to base the amplified second uplink RF signal on the basis of the second band- And transmits the uplink transmission signal generated by the remote optical transmission / reception unit to the remote optical transmission / reception unit.
3. The method of claim 2,
Wherein the first band-
Distributing the downlink transmission signal to the second band processor, extracting the first downlink RF signal from the downlink transmission signal, amplifying the first uplink RF signal, An RF processor configured to combine the RF signal and the amplified second uplink RF signal to generate the uplink transmission signal; And
And a digital processor configured to perform a crest factor reduction process and a pre-distortion process on the extracted first downlink RF signal,
Wherein the RF processor comprises:
And to amplify and output the first downlink RF signal subjected to the crest factor reduction process and the predistortion process by the digital processing unit.
5. The method of claim 4,
Wherein the RF processor comprises:
A distribution part for distributing the downlink transmission signal to the second band processing part;
An extraction / conversion part for extracting the first downlink RF signal by filtering the downlink transmission signal, converting the first downlink RF signal into an intermediate frequency (IF) signal, and outputting the IF signal to the digital processor;
A DL amplification part for amplifying and outputting the first downlink RF signal subjected to the crest factor reduction processing and the predistortion processing by the digital processing part;
A UL amplification part for amplifying and outputting the first uplink RF signal; And
And a combining part for combining the amplified first uplink RF signal and the amplified second uplink RF signal to generate the uplink transmission signal,
The digital processing unit includes:
An ADC part for digitizing the IF-converted first downlink RF signal;
A CFR part for performing a crest factor reduction process on the digitized first downlink RF signal;
A PD part for performing a predistortion process on the first downlink RF signal with the reduced crest factor; And
And a DAC part for analogizing the crest factor reduction and the predistorted first downlink RF signal and outputting the analogized downlink RF signal to the RF processor.
5. The method of claim 4,
The digital processing unit includes:
At least one of the downlink transmission signal, the first downlink RF signal, the amplified first downlink RF signal, the first uplink RF signal, the amplified first uplink RF signal, and the uplink transmission signal A PIMD measurement part for measuring a degree of passive intermodulation distortion caused by the RF processor by generating a predetermined test signal and using the test signal; And a VSWR measurement part for measuring a voltage standing wave ratio on a signal path of the processing part.
3. The method of claim 2,
Wherein the first band-
Distributing the downlink transmission signal to the second band processing unit, extracting the first downlink RF signal from the downlink transmission signal, amplifying and outputting the extracted first downlink RF signal, And an RF processor configured to amplify the uplink RF signal and to combine the amplified first uplink RF signal and the amplified second uplink RF signal to generate the uplink transmission signal.
8. The method of claim 7,
Wherein the RF processor comprises:
A distribution part for distributing the downlink transmission signal to the second band processing part;
An extracting part for extracting the first downlink RF signal by filtering the downlink transmission signal;
A DL amplification part for amplifying and outputting the extracted first downlink RF signal;
A UL amplification part for amplifying and outputting the first uplink RF signal; And
And a combining part for combining the amplified first uplink RF signal and the amplified second uplink RF signal to generate the uplink transmission signal.
9. The method of claim 8,
Wherein the first band-
At least one of the downlink transmission signal, the first downlink RF signal, the amplified first downlink RF signal, the first uplink RF signal, the amplified first uplink RF signal, and the uplink transmission signal A PIMD measurement part for generating a predetermined test signal and measuring the degree of manual intermodulation distortion by the RF processing part using the test signal, and a PIMD measurement part for measuring a voltage on the signal path of the RF processing part And a VSWR measurement part for measuring a standing wave ratio.
3. The method of claim 2,
The remote device includes:
A first downlink RF signal output from the first band processing unit, a first downlink RF signal output from the first band processing unit, separating the first uplink RF signal from an uplink signal to be input and outputting the first uplink RF signal to the first band processing unit A first DL / UL branch (branching) section configured to transmit the first DL / UL branch;
A second downlink RF signal output from the second band processing unit, separates the second uplink RF signal from the uplink signal to be input, and outputs the second uplink RF signal to the second band- A second DL / UL branching section configured to transmit the second DL / And
The amplified first downlink RF signal transmitted from the first DL / UL branching unit and the amplified second downlink RF signal transmitted from the second DL / UL branching unit are combined and transmitted to at least one antenna And a remote combining / distributing unit configured to transmit the uplink signal transmitted from the antenna to the first and second DL / UL branching units.
3. The method of claim 2,
The remote device includes:
And transmits the amplified first downlink RF signal output from the first band processing unit to the first antenna, separates the first uplink RF signal from the uplink signal transmitted from the first antenna, A first DL / UL splitter configured to transmit an RF signal to the first band processor; And
And transmits the amplified second downlink RF signal output from the second band processing unit to the second antenna, separates the second uplink RF signal from the uplink signal transmitted from the second antenna, And a second DL / UL branching unit configured to transmit the RF signal to the second band-processing unit.
3. The method of claim 2,
The remote device includes:
The first downlink RF signal output from the first band processing unit and the amplified second downlink RF signal output from the second band processing unit are transmitted to at least one antenna, and the uplink signal transmitted from the antenna Configured to separate the first and second uplink RF signals from the first uplink RF signal and transmit the first uplink RF signal to the first band processing unit and to transmit the second uplink RF signal to the second band processing unit, / Distribution unit.
The method according to claim 1,
The remote device includes:
And a remote control unit for controlling the first and second band processing units,
The interface unit includes:
And receives the first and second control signals from the remote control unit, transfers the first control signal to the first band processing unit, and transmits the second control signal to the second band processing unit.
The method according to claim 1,
The remote device includes:
And a remote power unit configured to generate driving power for driving the first and second band processing units,
The interface unit includes:
And receives the driving power from the remote power supply unit and delivers the driving power to the first band processing unit and the second band processing unit, respectively.
A head end device configured to combine a plurality of downlink RF signals of different frequency bands received from a plurality of base stations to generate a downlink transmission signal and to convert the downlink transmission signal into a downlink optical signal; And
Receiving the downlink optical signal from the head end device, converting the downlink optical signal to the downlink transmission signal, amplifying the plurality of downlink RF signals included in the downlink transmission signal, And a remote device configured to transmit a plurality of downlink RF signals via at least one antenna,
The remote device includes:
And to amplify the downlink RF signals of the corresponding one of the plurality of downlink RF signals included in the downlink transmission signal, each of the plurality of downlink RF signals being cascaded with each other to transfer the downlink transmission signal from the front end to the rear end, And a plurality of band processing units for receiving the plurality of band signals.
16. The method of claim 15,
The remote device includes:
A remote optical transceiver configured to convert the downlink optical signal into the downlink transmission signal; And
And an interface unit configured to receive the downlink transmission signal from the remote optical transmission / reception unit and transmit the downlink transmission signal to a band processing unit in the forefront of the plurality of connected band processing units.
17. The method of claim 16,
The remote device includes:
And a remote control unit for controlling the plurality of band processing units,
The interface unit includes:
A plurality of control signals for controlling a corresponding one of the plurality of band processing units from the remote control unit, and to transmit the plurality of control signals to the corresponding band processing unit, respectively.
17. The method of claim 16,
The remote device includes:
And a remote power unit configured to generate driving power for driving the plurality of band processing units,
The interface unit includes:
And receives the driving power from the remote power supply unit and delivers the driving power to the plurality of band processing units.
16. The method of claim 15,
Wherein at least one of the plurality of band processing units comprises:
An RF processor configured to distribute the downlink transmission signal to a downstream band processing unit and extract a downlink RF signal of a corresponding one of the plurality of downlink RF signals included in the downlink transmission signal; And
And a digital processor configured to perform a crest factor reduction process and a predistortion process on the extracted downlink RF signal,
Wherein the RF processor comprises:
And to amplify and output the crest factor reduction processing and the predistorted downlink RF signal by the digital processing unit.
20. The method of claim 19,
The digital processing unit includes:
A spectral monitoring part for monitoring a spectrum of at least one of the downlink transmission signal, the extracted downlink RF signal, and the amplified downlink RF signal, and a controller for generating a predetermined test signal, Further comprising at least one of a PIMD measurement part measuring a degree of manual intermodulation distortion by the RF processing part and a VSWR measurement part measuring a voltage standing wave ratio on a signal path of the RF processing part.
16. The method of claim 15,
Wherein at least one of the plurality of band processing units comprises:
Distributes the downlink transmission signal to a downstream band processing unit, extracts a downlink RF signal of a corresponding frequency band among the plurality of downlink RF signals included in the downlink transmission signal, And an RF processor configured to amplify and output the amplified signal.
22. The method of claim 21,
Wherein at least one of the plurality of band processing units comprises:
A spectral monitoring part for monitoring a spectrum of at least one of the downlink transmission signal, the extracted downlink RF signal, and the amplified downlink RF signal, and a controller for generating a predetermined test signal, And a VSWR measurement part for measuring a voltage standing wave ratio on the signal path of the RF processing part. 2. The distributed antenna system as claimed in claim 1, wherein the PIMD measurement part measures the degree of passive intermodulation distortion by the RF processing part.
16. The method of claim 15,
The remote device includes:
A plurality of Dl / UL branching sections each connected to a corresponding one of a plurality of band processing sections and configured to receive an amplified downlink RF signal output from a corresponding band processing section; And
And a remote combining / distributing unit connected to the plurality of DL / UL branching units and configured to transmit a plurality of amplified downlink RF signals transmitted from the plurality of DL / UL branching units to at least one antenna A distributed antenna system.
16. The method of claim 15,
The remote device includes:
Each of which is connected to a corresponding one of the plurality of band processing units, receives the amplified downlink RF signal output from the corresponding band processing unit, and transmits the amplified downlink RF signal to a corresponding one of the plurality of antennas And a plurality of DL / UL branching sections, each of the plurality of DL / UL branching sections being configured.
16. The method of claim 15,
The remote device includes:
And a remote combining / distributing unit connected to the plurality of band processing units and transmitting the amplified downlink RF signals output from the plurality of band processing units to at least one antenna.

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