WO2019132542A1

WO2019132542A1 - Signal processing and transmission architecture of das

Info

Publication number: WO2019132542A1
Application number: PCT/KR2018/016756
Authority: WO
Inventors: 조정범; 김종완; 최성철; 공석환
Original assignee: 주식회사 에치에프알
Priority date: 2017-12-27
Filing date: 2018-12-27
Publication date: 2019-07-04

Abstract

Disclosed are a signal processing method and a node unit of a multi-operating distributed antenna system (DAS). An embodiment of the present invention provides a signal processing method of a multi-operating DAS, which is a method performed by a node unit of a DAS, the signal processing method comprising the steps of: converting each of one or more radio frequency (RF) signals, transmitted from the outside, into a discrete signal; extracting a downlink signal included in the discrete signal; and routing the extracted downlink signal to one or more sub-units constituting the DAS.

Description

DAS signal processing and transmission architecture

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distributed antenna system (DAS), and more particularly, to a communication system that not only improves communication quality by relaying mobile communication between a base station and a terminal using digitized and standardized signals, To a signal processing method and a node unit of a multi-operating DAS capable of instantly responding to a signal.

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

In order to maintain the quality of the mobile communication service, it is necessary that the base station is installed at a proper location. However, since the base station is required to be installed and operated at a high cost and requires a certain area of installation space, there is a cost and space limit for installing the base station at all positions that can maintain or improve the service quality.

In order to overcome these limitations, a separate communication relay system for mobile communication relay is installed in a place where radio wave interference or physical barriers such as a building, a subway, an underground roadway, a tunnel, etc. exist and a shadow area And a distributed antenna system (Distributed Antenna System) is a typical communication relay system.

The distributed antenna system may comprise a master unit (MU), which may be referred to as a node unit, and a plurality of remote units (RU) connected to the master unit.

The master unit relays communication between the base station and the remote units, and the remote unit is uniformly distributed throughout the mobile communication service area and relays communication with the user's mobile communication terminal. Also, the remote unit can provide a communication service to a mobile communication terminal located at a cell boundary by forming a virtual cell.

As described above, the conventional distributed antenna system has an advantage in that smooth mobile communication can be realized between the base station and the mobile communication terminal by eliminating the local shadow area through the communication relay between the master unit and the remote unit. However, And it can not immediately respond to the dynamic changes of the communication environment.

Specifically, a conventional distributed antenna system relays an RF signal (downlink) transmitted from a base station to a mobile communication terminal and relays an RF signal (uplink) transmitted from the mobile communication terminal to a base station. The RF signal includes a plurality of signals having different frequency bands, so that interference may occur between them, and in such a case, the communication quality may be degraded.

In addition, the conventional distributed antenna system has its own data throughput fixed in accordance with the average communication data amount of a building or building. Therefore, when a temporary or continuous increase in the amount of communication data occurs in the place or the building, a lot of costly and time-consuming operations such as additional hardware and firmware update are required to cover the increased data amount, It can be said that there is a certain limit to cope with the change of

In an embodiment of the present invention, since the RF signal is digitized and utilized for communication relay, it is possible to prevent a problem of interference between signals of different frequency bands, thereby improving multi-operating DAS A signal processing method and a node unit according to the present invention.

According to another embodiment of the present invention, there is provided a signal processing method of a multi-operating DAS, which can improve the accuracy and immediacy of correspondence of a communication relay since it is configured to implement communication relay in a unit of a standardized variable frame, There is a main purpose in providing a unit.

According to an embodiment of the present invention, a method performed in a node unit of a Distributed Antenna System (DAS) is a method in which each of at least one RF signal transmitted from the outside is divided into a discrete signal ; Extracting a downlink signal included in the discrete signal; And routing the extracted downlink signal to one or more lower-order node units constituting the DAS. The multi-operating DAS signal processing method of the present invention provides a signal processing method of a multi-operating DAS.

According to another embodiment of the present invention, a node unit of a Distributed Antenna System (DAS) converts each of at least one RF signal transmitted from the outside into a discrete signal Converter; A signal processor for extracting a downlink signal included in the discrete signal; And a router for routing the extracted downlink signal to one or more lower node units constituting the DAS. The node unit of the multi operating DAS is provided.

As described above, the present invention is configured to convert an analog signal transmitted from a base station or a terminal into a digital signal and relay the mobile communication using the converted signal. Therefore, interference between signals having different frequency bands And can be fundamentally intercepted to provide a further improved communication quality.

Further, the present invention is configured to arrange a digitized signal in a standardized frame, relay the plurality of communication signals having different frequency bands to a valid destination by utilizing the frame as a basic unit of communication relay, Can be further improved.

Furthermore, since the number of sub-frames constituting the frame, the bandwidth and the like can be variably adjusted according to the change of the communication environment, it is possible to cope with a flexible communication environment more promptly and flexibly.

In addition, since the present invention is implemented in the form of a card module that can physically and electrically connect and connect to a distributed antenna system, the throughput of communication data can be controlled by a simple act of connecting and disconnecting the card module to and from the distributed antenna system, The effect of prompt and flexible response to the data environment can be further enhanced.

1 is a diagram showing the overall structure of a distributed antenna system including a master unit of the present invention.

2 is a block diagram schematically showing a master unit according to an embodiment of the present invention.

3 is a flowchart for explaining a process in which the master unit of the present invention relays communication from a base station to a terminal.

4 is a flowchart illustrating a process of relaying communication from a terminal to a base station by the master unit of the present invention.

5 is a block diagram schematically showing a remote unit according to an embodiment of the present invention.

6 is a flowchart for explaining a process in which a remote unit of the present invention relays communication from a base station to a terminal.

7 is a flowchart for explaining a process in which a remote unit of the present invention relays communication from a terminal to a base station.

8 is a diagram for explaining an embodiment of the present invention in which a digitized communication signal is arranged in a standardized frame.

9 is a diagram for explaining an embodiment of the present invention for routing a standardized communication signal.

10 to 12 are diagrams for explaining various embodiments in which a distributed antenna system including a master unit of the present invention relays communication signals.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the components of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. Throughout the specification, when an element is referred to as being "comprising" or "comprising", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise . In addition, '... Quot ;, " module ", and " module " refer to a unit that processes at least one function or operation, and may be implemented by hardware or software or a combination of hardware and software.

1 is a diagram showing an overall structure of a distributed antenna system including a node unit (hereinafter referred to as a 'master unit 100' or a 'remote unit 200') of a multi-operating DAS according to the present invention . Hereinafter, the overall structure and functions of the distributed antenna system including the master unit 100 and the remote unit 200 of the present invention will be described with reference to FIG.

1, the distributed antenna system may be configured to include a master unit 100 and one or more remote units 200-n, and in accordance with an embodiment, one or more slave master units (100-n), and one or more hub units (30-n).

The master unit 100, the remote unit 200, the hub unit 30, the antenna, and the like shown in FIG. 1 correspond to a node unit of the distributed antenna system. 100 and the signal processing method in the remote unit 200 itself or in the master unit 100 and the remote unit 200. [

In the case of a downlink in which mobile communication is implemented in the terminal direction from the base station 10, the master unit 100 of the present invention receives analog RF signals in the RF band from the base station 10 and converts the analog RF signals into digitized signals And then transmits the converted signal directly to the remote unit 200 or through the hub unit 30-n to relay the downlink communication between the base station 10 and the terminal (not shown).

The master unit 100 of the present invention receives the digitized signal directly from the remote unit 200 or transmits the digitized signal through the hub unit 30-n in the case of the uplink in which the mobile communication is implemented in the direction of the base station 10 from the terminal And relays the uplink communication between the terminal and the base station 10 by transmitting the transmitted signal to the base station 10.

In the case of the downlink, the remote unit 200 of the present invention separates signals transmitted from the master unit 100 by frequency bands, re-converts the separated signals into analog RF signals of the RF band, And transmits the signal to the terminals located in the cell responsible for itself through the antenna 40 connected to the signal.

In the case of the uplink, the remote unit 200 of the present invention receives analog RF signals of the RF band from terminals located in its own cell, converts the analog RF signals into digitized signals, To the master unit 100 of the base station 10 or through the hub unit 30-n, thereby relaying the uplink communication between the base station 10 and the terminal.

1 shows an example of a configuration of a distributed antenna system, a distributed antenna system is installed in an installation area such as an in-building, a subway, a hospital, a stadium, It is possible to make various structural modifications. For example, the number of the master unit 100, the number of the remote unit 200, and the number of the hub units 30, or the connection relationship between them, may be different from the structure shown in FIG.

Also, in the distributed antenna system, the hub unit 30-n is utilized when the number of links to be branched from the master unit 100 is limited compared with the number of the remote units 200 requiring installation. Therefore, the hub unit 30-n may be omitted when the number of the remote units 200 can be sufficiently accommodated by a single master unit 100 or when a plurality of master units 100 are installed.

When the hub unit 30-n is composed of a plurality of hub units, the master unit 100 of the present invention can selectively transmit the digitized signal to the plurality of hub units 30-n, ) Can be configured as separate cells.

The slave master unit 100-n shown in FIG. 1 corresponds to a configuration in which the base station 10 is additionally connected when an interface expansion is required. Specifically, when a large number of crowded terminals (terminals) are concentrated in a building, a subway, a hospital, a stadium, etc. in which a distributed antenna system is implemented and a communication data throughput increases, a slave master unit 100- It is possible to process the increased mobile communication data through the relay function of the unit 100-n itself.

The master unit 100 and the slave master unit 100-n of the present invention may be a card type module capable of connecting (connecting) and disconnecting (disconnecting) a distributed antenna system through a dedicated slot or connection terminal formed in the distributed antenna system . &Lt; / RTI >

The connection and disconnection between the card-type module and the distributed antenna system includes both physical connection, physical disconnection, electrical connection and electrical disconnection. That is, the card-type module can be electrically connected to and disconnected from the distributed antenna system by physically connecting and disconnecting the distributed antenna system through a dedicated slot or the like formed in the distributed antenna system.

As described above, when the master unit 100 and the slave master unit 100-n of the present invention are implemented in the form of a card type module, the simple operation of connecting and disconnecting the card module to the distributed antenna system can reduce the communication data throughput The master unit 100 and the slave master unit 100-n of the present invention can provide an immediate and flexible corresponding effect to a flexible data environment.

A signal transmission medium or signal transmission method between each node (master unit, remote unit, hub unit, slave master unit, etc.) can be implemented by various methods.

For example, a remote unit 200 connected between the master unit 100 and the hub unit 30-n and a remote unit 200 directly connected to the master unit 100 is connected by an optical cable and is connected to a cascade- The mutual connections can also be implemented by connecting them through an RF cable, a twisted cable, a UTP cable or the like. Of course, the remote unit 200 directly connected to the master unit 100 can be connected to the remote unit 200 through an RF cable, a twisted cable, a UTP cable, or the like.

Hereinafter, a description will be given of the case where the master unit 100 and the slave master unit 100-n and the hub unit 30-n are connected between the master unit 100 and the hub unit 30-n, between the hub units 30- ) And the remote unit 200 are connected through an optical cable and the internal structures of the master unit 100 are connected through a backplane link.

FIG. 2 is a block diagram schematically showing a master unit 100 according to an embodiment of the present invention. FIG. 3 is a block diagram of a master unit 100 according to the present invention for communicating (downlink) from a base station 10 to a terminal FIG. 4 is a flowchart for explaining a process in which the master unit 100 of the present invention relays communication (uplink) from the terminal to the base station 10. FIG.

Hereinafter, with reference to FIG. 2 to FIG. 4, the master unit 100 of the present invention relays communication through subcomponents constituting the master unit 100 of the present invention and these subcomponents, that is, Will be described in detail.

With respect to the order of description, a method of relaying the downlink will be described first after the master unit 100 of the present invention relays the method, and then a method of relaying the uplink will be described later.

2, the master unit 100 of the present invention includes an A / D converter 110-1, a D / A converter 110-2, a signal processor 120, a router 140, Optical converter 150-1 and an optical / electrical converter 150-2.

First, in the case of downlink, if more than one RF signal is received from the base station 10 at step S310, the A / D converter 110-1 of the present invention converts the received RF signal into a digitized signal, (S320).

The RF signal received from the base station 10 may be a plurality of RF signals having different frequencies for each band (800 MHz, 1.7 GHz, 2.1 GHz, 2.5 GHz, 3.5 GHz, etc.) and / In this case, the A / D converter 110-1 of the present invention converts RF signals having different frequencies into discrete signals (S320).

The signal processing unit 120 of the present invention applies a digital signal processing (DSP) to a discrete signal to extract a downlink signal from the discrete signal (S330).

In detail, the signal processing unit 120 of the present invention filters the discrete signal using a digital filter to remove the noise included in the discrete signal, downconverts the frequency of the discrete signal from which the noise is removed, (Step S330).

The signal processing unit 120 of the present invention may further include a configuration (for example, a low-noise amplifier) (not shown) for amplifying an attenuated signal in the process of being transmitted from the base station 10 And the like.

When the RF signal is a plurality of RF signals having different frequencies for each band and / or each mobile communication company, the A / D converter 110-1 converts each of the plurality of RF signals into a plurality of discrete signals (S320). The signal processing unit 120 of the present invention can extract a plurality of downlink signals from each of the plurality of discrete signals (S330).

When the downlink signal is extracted, the router 140 of the present invention routes the extracted downlink signal to the remote unit 200 (S340). Here, routing refers to a process of selecting a path through which a downlink signal is transmitted between a master unit (link of a master unit) 100 and a remote unit 200.

The router 140 of the present invention can select a path to which a downlink signal is to be transmitted based on the identity of a specific downlink signal and a frequency band between specific remote units 200, .

When the routing is completed, the O / E converter 150-1 of the present invention converts the downlink signal, which is an electrical signal, into a light-separated signal (S350), and transmits the light- Unit) to complete the downlink relay.

Conversion into a light-diverging signal through the pre / optical converter 150-1 or a later-described optical / electrical converter 150-2 is performed when the master unit 100 of the present invention is switched between a lower unit (a remote unit and a hub unit) It is assumed that it is connected through a cable.

Accordingly, when the master unit 100 of the present invention is connected to a lower unit using another scheme such as an RF cable, a twisted cable, a UTP cable, etc., the master unit 100 of the present invention has a corresponding conversion structure And the like.

Next, in the case of the uplink, the optical / electrical converter 150-2 of the present invention converts the uplink signal transmitted from the remote unit 200 or the hub unit 30 (S410) into an electrical signal (S420) . This uplink signal corresponds to a discrete signal digitized through the A / D conversion process in the remote unit 200. [

Since the uplink signal corresponds to a signal transmitted from one or more terminals to one or more remote units 200 through the master unit 100 (finally, the base station), the uplink signal includes various frequency bands May be included.

Accordingly, the router 140 of the present invention routes each of the uplink signals of various frequency bands and separates or distinguishes the uplink signals of the various frequency bands by the corresponding frequency bands (based on the frequency band) (S430).

The signal processing unit 120 of the present invention may perform up-conversion of uplink signals classified by frequency bands into a carrier band or amplify the uplink signals so as to reach the base station 10 (S440) .

The D / A converter 110-2 of the present invention converts the uplink signal (discrete signal) that has passed through the signal processing unit 120 into an analog signal, and transmits the converted signal to the base station 10 to complete the uplink relay (S450).

As described above, the present invention is configured to convert an analog signal (RF signal) transmitted from the base station 10 or a terminal to a digital signal (discrete signal) and relay the mobile communication using the discrete signal, It is possible to prevent interference between analog signals having a high level of communication quality.

FIG. 2 shows a configuration in which the optical / electrical converter 150-1 and the optical / electrical converter 150-2 of the present invention are implemented as separate components. However, according to the embodiment, the optical / And the optical / electrical converter 150-2 may be implemented with a single configuration to convert the electrical discrete signal into the optical discrete signal and convert the optical discrete signal into the electrically discrete signal.

2, the router 140 of the present invention is implemented in a single configuration, but according to the embodiment, the router 140 of the present invention includes a downlink dedicated router 140 for establishing a downlink path, Or an uplink dedicated router 140 for establishing a link path.

2, the signal processing unit 120 of the present invention is implemented in a single configuration. However, according to an embodiment of the present invention, the signal processing unit 120 includes a downlink dedicated signal processing unit 120 and an uplink dedicated signal processing unit 120 for processing an uplink signal.

2 shows a configuration in which the A / D converter 110-1 and the D / A converter 110-2 of the present invention are implemented as separate components. However, according to the embodiment, the A / D converter 110-1 And the D / A converter 110-2 may be implemented in a single configuration.

FIG. 5 is a block diagram schematically showing a remote unit 200 according to an embodiment of the present invention. FIG. 6 is a diagram illustrating a communication (downlink) from the base station 10 to a terminal FIG. 9 is a flowchart for explaining a process of relaying the communication (uplink) from the terminal to the base station by the remote unit 200 of the present invention.

Hereinafter, a method (signal processing method) of relaying communication by the remote unit 200 of the present invention through subcomponents constituting the remote unit 200 of the present invention and subcomponents thereof will be described with reference to FIGS. 5 to 7, Will be described in detail.

A method of relaying the downlink after the remote unit 200 according to the present invention relays the procedure will be described later.

5, the remote unit 200 of the present invention includes an optical / electrical converter 210-1, an optical / electrical converter 210-2, a router 220, a signal processor 240, a D / A converter 250-1 and an A / D converter 250-2.

First, in the case of the downlink, the optical / electrical converter 210-1 of the present invention is electrically disassembled from the master unit 100 or the hub unit 30 of the present invention (S610) (S620).

As described above, since the electric discrete signal includes downlink signals of various frequency bands, the router 220 of the present invention transmits the downlink signals to the respective frequency bands (frequency band Or band) is separated or separated (S630).

The signal processing unit 240 of the present invention performs frequency up-conversion of a downlink signal classified by a frequency band to a carrier frequency band by applying a DSP to the carrier frequency band or amplifying the uplink signal to reach the base station 10 (S640).

The D / A converter 250-1 of the present invention converts the downlink signal (discrete signal) through the signal processor 240 into an analog signal (S650), and transmits the converted signal through the antenna 40 connected thereto (S660).

In the case of the uplink, the A / D converter 250-2 of the present invention receives the uplink RF signals of various frequency bands from the terminals through the antenna 40 (S710) (S720).

The signal processor 240 of the present invention extracts an uplink signal from a discrete signal by applying a DSP to the discrete signal (S730). The concrete operation of the signal processing unit 240 constituting the remote unit 200 can be implemented in the same manner as the operation described above of the signal processing unit 120 constituting the master unit 100. [

In the case where the RF signal is composed of a plurality of analog signals having different frequencies for respective bands and / or mobile communication companies, as described above, the A / D converter 250-2 converts each of the plurality of signals into a plurality of discrete signals And the signal processing unit 240 of the present invention can extract a plurality of uplink signals from each of the plurality of discrete signals.

When the uplink signal is extracted, the router 220 of the present invention routes the extracted uplink signal (S740). Here, routing refers to a process of selecting a path through which an uplink signal is to be transmitted between a link of the master unit 100 and a remote unit 200.

The router 220 of the present invention can be used for the case where the specific band of the specific uplink signal and the specific master unit 100 (link of the master unit), the identity of the frequency according to the carrier, the identity of the multiplexing scheme such as TDD and FDD (Corresponding relationship) between the uplink signal and the downlink signal.

When the routing is completed, the O / E converter 210-2 of the present invention converts the uplink signal, which is an electrical signal, into a light-separated signal, and transmits the light-separated signal to an upper unit (master unit or hub unit) Thereby completing the uplink relay (S750).

FIG. 5 illustrates a configuration in which the optical / electrical converter 210-2 and the optical / electrical converter 210-1 of the present invention are implemented as separate components. However, according to the embodiment, the optical / And the optical / electrical converter 210-1 may be implemented in a single configuration.

5, the signal processing unit 240 of the present invention is implemented in a single configuration. However, according to an embodiment of the present invention, the signal processing unit 240 includes a downlink dedicated signal processing unit 240 and an uplink dedicated signal processing unit 240 for processing an uplink signal.

5, the router 220 of the present invention is embodied in a single configuration. However, according to the embodiment of the present invention, the router 220 includes a downlink dedicated router 220 for setting a downlink path, And an uplink dedicated router 220 that sets a path of an uplink.

8 is a diagram for explaining an embodiment of the present invention in which a digitized communication signal (a downlink signal converted into a discrete signal and an uplink signal) is arranged in a standardized frame 50. In Fig.

Hereinafter, with reference to FIG. 2 to FIG. 8, a description will be given of a technical feature of the present invention in which the master unit 100 and the remote unit 200 of the present invention perform internal transmission of a communication signal using a specific frame 50 Explain it.

The master unit 100 and the remote unit 200 of the present invention are arranged such that a digitized downlink signal or an uplink signal is arranged in one or more predetermined frames 50 in steps S331 and S735, And may be configured to implement an internal transmission for a communication signal.

2 and 5, the master unit 100 and the remote unit 200 of the present invention include framers 130-1 and 230-2 and de-framers 130-2 and 230-1 ). &Lt; / RTI >

The framers 130-1 and 230-2 are configured to arrange the downlink signal or the uplink signal extracted from the discrete signal in the frame 50, Or de-framing the arrangement of the uplink signals from the frame 50. [

Here, the frame 50 corresponds to a term referring to a logically generated transmission means for internally transmitting a downlink signal or an uplink signal in the master unit 100 and the remote unit 200 of the present invention.

That is, the frame 50 refers to a specific unit when the downlink signal or the uplink signal is configured in a specific unit and the signals of the specific unit are used as a unit of internal transmission.

Therefore, if it corresponds to a unit of internal transmission for transmitting a downlink signal or an uplink signal, it is preferable to be interpreted as a frame 50 of the present invention without being limited to a name such as a frame, a container or the like .

In FIG. 8, on the basis of the framers 130-1 and 230-2 or the de-framers 130-2 and 230-1, the signal located on the left indicates a signal that is not framed or a signal extracted from the frame, Lt; / RTI > represents a framed signal.

The framers 130-1 and 230-2 of the present invention are arranged such that a downlink signal (master unit) or an uplink signal (remote unit) extracted from the

signal processing units

120 and 240 is placed in one or more predetermined frames 50 (S331, S735).

The frame 50 is composed of one or more sub-frames 50-n having a preset bandwidth. Therefore, the framers 130-1 and 230-2 of the present invention divide the downlink signal or the uplink signal into sub-frame units (sub-frame bandwidth units) 50-n, And can be placed in the frame 50-n (S331, S735).

The number n of subframes constituting the frame 50 and the bandwidth of each of the subframes 50-n must be allocated to a user's setting, a communication environment, and a specific frequency band with more resources or fewer resources And may be variably set according to necessity or the like. In addition, each of the sub-frames 50-n constituting the specific frame 50 may be set to have different bandwidths.

For example, as shown in FIG. 8, when the downlink signals of the 800 MHz frequency band and the 1.7 GHz frequency band have a relatively small amount of data, the frame 50 for this frequency band is divided into three subframes 50 -1, 50-2, and 50-3, while the frame for the other frequency bands may be composed of six sub-frames 50-1 to 50-6.

When data processing is possible with only three sub-frames 50-1, 50-2, and 50-3 because the communication data processing amount for the corresponding frequency band (800MHz frequency band and 1.7GHz frequency band) is relatively small, Frames) can be variably set.

8, the bandwidth of each of the sub-frames 50-n constituting the same frame 50 may be varied according to the data amount of the downlink signal allocated thereto Lt; / RTI >

When the downlink signal or the uplink signal is arranged in the frame 50, the

routers

140 and 220 of the present invention perform routing in units of sub-frames 50-n, (S340). The downlink signal or uplink signal is divided into a plurality of subframes.

Next, in the case of the uplink signal (left direction of the double arrow), the de-framer 130-2, 230-1 of the present invention releases the frame 50 from the framed signal, Signal or an uplink signal.

When the frame 50 is released, the downlink signals or the uplink signals, which have been divided and arranged in units of the sub-frame 50-n, are interconnected to generate a serial discrete signal of a specific frequency band (S435, S635).

9 is a diagram for explaining an embodiment of the present invention for routing a standardized communication signal. Hereinafter, the technical features of the present invention for routing the framed downlink signal or the uplink signal in frames 50 will be described with reference to FIGS.

The

routers

140 and 220 of the present invention route the frame 50 itself and place it in the frame 50 as described above, Thereby causing the downlink signal or the uplink signal to be routed.

In the case of the above-described embodiment in which the frame 50 is composed of one or more sub-frames 50-n and the downlink signal or uplink signal is divided and arranged in units of this sub-frame 50-n, 140, and 220 may be configured to route in units of sub-frames 50-n.

In order to implement this routing procedure, the

routers

140 and 220 of the present invention transmit a second framer 141 (hereinafter, referred to as a " second frame ") 60 that relocates the subframe 50-n to a new frame 221 and a

routing controller

143, 223 for controlling the relocation operation of the

second framers

141, 221 according to a preset correspondence relationship.

Frames 50 arranged on the left side in FIG. 9 correspond to frames (hereinafter referred to as 'first frame') used in the framers 130-1 and 230-2, and frames arranged on the right side correspond to frames And corresponds to the second frame 60 used in the

routers

140 and 220.

9 shows that the first frame 50 is composed of six sub-frames 50-1 to 50-6 and the second frame 60 is composed of twelve second sub-frames 60-1 to 60-12 The number of the second sub-frames 60-n constituting the second frame 60 and the number of the first sub-frames 60-n constituting the second sub-frame 60-n, respectively, May be variably set according to the setting of the user, the communication environment, the necessity of allocating more resources or less resources to a specific frequency band, and the like. Also, each of the second sub-frames 60-n may be set to have a different bandwidth.

The

second framers

141 and 221 of the present invention are arranged in the downlink direction (master unit) or the uplink direction (remote unit) in the frame of the 800 MHz frequency band in the state in which the second sub-frame 60- The first sub-frame 50-1 is the first second sub-frame 60A-1 of the second frame 60A and the second sub-frame 50-2 is the second frame 60A, The third sub-frame 50-3 is arranged in the second sub-frame 60A-3, and the third sub-frame 50-3 is arranged in the third sub-frame 60A- Frame to the second sub-frame 60-n (S341, S741).

In the uplink direction (master unit) or the downlink direction (remote unit), the first second sub-frame 60A-1 is divided into a first sub-frame 50-1 and the second second sub- 2 is shifted to the second sub-frame 50-2 and the third sub-frame 60A-3 is rearranged to the third sub-frame 50-3, (60-n) to the sub-frame 50-n (S431, S631).

As described above, according to the present invention, a digitized signal is arranged in a standardized frame 50, the frame 50 is used as a basic unit of communication relay, and a plurality of communication signal frames (subframes) And relay it to an effective destination. Therefore, various communication signals in different frequency bands can be relayed more accurately.

The relocation rule, that is, the correspondence, is variable depending on the communication environment, the necessity of allocating more resources or fewer resources to a specific frequency band, the duplexing method of the remote unit 200 corresponding to the lower unit based on the downlink direction, Lt; / RTI >

For example, the link A shown in FIG. 9 corresponds to a route routed to the remote unit 200 of the FDD duplexing system, and the link B shown in FIG. 9 is routed to the remote unit 200 of the TDD duplexing system Path. Of course, both Link A and Link B may be configured to be used as a routing path of either the FDD duplexing scheme or the TDD duplexing scheme in accordance with the communication environment or the like.

Such a correspondence relationship may be set in advance and stored in the

routing control units

143 and 223 of the present invention, and may have various forms such as a routing table. According to the embodiment, the

routing control units

143 and 223 of the present invention are configured to control relocation only on the basis of the corresponding relationship, and correspondence relationships such as the routing table are stored in a separate configuration such as a storage unit (not shown) .

In addition, the

routing control units

143 and 223 of the present invention can be configured to update the correspondence stored in itself or in a separate storage unit according to a command input from the outside as shown in FIG.

As described above, the present invention is configured to change the paths of a plurality of communication signals through simple command input, so that it is possible to flexibly and immediately respond to changes in the communication environment.

10 to 12 are views for explaining various embodiments in which a distributed antenna system including the master unit 100 of the present invention relays communication signals. Hereinafter, various embodiments in which the DAS including the master unit 100 of the present invention relay the communication signal will be described with reference to FIGS. 10 to 12. FIG.

10 shows an embodiment of the present invention in which a large number of communication data are processed using the slave master units 100-1 and 100-2 additionally. When RF signals of a plurality of frequency bands are transmitted from three different base stations 10-1, 10-2 and 10-3, each of these RF signals is transmitted to three master units (master unit 100, (100-1, 100-2)) performs downlink extraction, framing, routing, and other processing as described above.

The downlink signals routed to the five hub units 30-n divided for each frequency band are transmitted to the corresponding remote unit 200 and relayed to the terminal through an antenna (not shown).

The remote units 200-1 to 200-12 connected to the hub unit 1 (30-1) correspond to the remote units 200-1 to 200-12 communicating with the base station 1 (10-1) Only the downlink signals K1, D1, Y1, S1, W1, B1, and U1 received from the base station 1 10-1 are transmitted to the remote units 200-1 to 200-12 And is separately relayed for each frequency band.

The remote units 200-13 to 200-24 connected to the hub unit 2-2-2 are connected to the remote units 200-13 to 200-24 communicating with the base stations 1 10-1 and 2-10-2, 10, the remote units 200-13 to 200-24 are provided with the downlink signals K1, D1, Y1, S1, W1 received from the base station 1 10-1 And the downlink signals K2, D2, U2, and S2 received from the base station 2 and the base station 2 are relayed separately for each frequency band.

The remote units 200-49 to 200-60 connected to the hub unit 5-2 are connected to the remote units 200-49 to 200-60 10, the remote units 200-49 to 200-60 are provided with the downlink signals Y1, D1, W1, B1 and K1 received from the base station 1 10-1 And the downlink signals K3, D3, S3, and U3 received from the base station 3 (10-3) are relayed separately for each frequency band.

11 is a diagram illustrating an example in which a DAS including the master unit 100 of the present invention supports a dual band 4x4 Multi Input Multi Output (MIMO). 11, when a plurality of RF signals 2.5G_1, 3.5G_1, 2.5G_2 and 3.5G_2 corresponding to the frequency bands of 2.5 GHz and 3.5 GHz are received from the

base station

10, 100 converts each of the RF signals into a discrete signal and routes the converted discrete signals (downlink signals) for each of the sub-frames 50-n so that the corresponding remote unit 200 is connected to the hub unit 30- 1, and 30-2.

The hub units 30-1 and 30-2 which have received the serial discrete signals (framed downlink signals) constituted by one or more sub-frames 50-n are connected to the remote unit 200 corresponding to each of the downlink signals, And transmits the corresponding downlink signals.

By the routing of the master unit 100 and the relaying of the hub units 30-1 and 30-2, the framed downlink signals corresponding to the frequencies 2.5G_1 and 3.5G_1 are transmitted to the remote units # 1 200-1, Is transmitted to the remote unit # 11 (200-11), the remote unit # 13 (200-13), the remote unit # 23 (200-23), etc. and provided to the terminals in coverage covered by each remote unit 200 .

Also, by the routing of the master unit 100 and the relaying of the hub units 30-1 and 30-2, the framed downlink signals corresponding to the frequencies 2.5G_2 and 3.5G_2 are transmitted to the remote unit # , The remote unit # 14 (200-14), the remote unit # 24 (200-24), and the like, and is provided to the terminals in the coverage covered by each remote unit 200. [

12 is a diagram illustrating an example in which the DAS including the master unit 100 of the present invention supports 2x2 MIMO for the 2.5G frequency band and 4x4 MIMO for the 3.5G frequency band.

As shown in FIG. 12, when a plurality of RF signals (2.5G_1, 3.5G_1, 3.5G_2, 3.5G_3 and 3.5G_4) corresponding to the 2.5 GHz and 3.5 GHz frequency bands are received from the base station 10, The master unit 100 converts each of the RF signals into a discrete signal and routes the converted discrete signals (downlink signals) according to the sub-frames 50-n so that the corresponding remote unit 200 is connected to the hub unit (30-1, 30-2).

Due to the routing of the master unit 100 and the relaying of the hub units 30-1 and 30-2, the framed downlink signal corresponding to the 2.5G_1 frequency corresponds to a single signal based on the corresponding frequency band, Unit 200 and provided to the terminal.

The framed downlink signals corresponding to 3.5G_1, 3.5G_2, 3.5G_3, and 3.5G_4 are transmitted to the remote unit 200 capable of communicating using the frequency, and are provided to the terminal.

8 to 12, various embodiments related to the technical features and technical features of the present invention have been described with reference to frequencies of 800 MHz, 1.7 GHz, 2.1 GHz, 2.5 GHz, and 3.5 GHz, The present invention is merely an example for emphasizing the practicality or feasibility of the present invention by applying reference frequency band to be applied.

That is, the present invention can be configured to relay frequencies of various bands in addition to the above-mentioned frequencies of 800 MHz, 1.7 GHz, 2.1 GHz, 2.5 GHz and 3.5 GHz.

3, FIG. 4, FIG. 6, and FIG. 7, steps S310 through S350, S410 through S450, S610 through S660, and S710 through S750 are sequentially performed. However, But merely exemplifies the technical idea of the embodiment.

In other words, those skilled in the art will recognize that changes may be made to the procedures described in Figures 3, 4, 6, and 7 without departing from the essential characteristics of one embodiment of the present invention Executing at least one of steps S310 to S350, at least one of steps S410 to S450, at least one step S610 to S660, or S710 to S750 in parallel. 3, 4, 6, and 7 are not limited to the time-series order.

3, 4, 6 and 7 can be embodied as computer-readable codes on a computer-readable recording medium. A computer-readable recording medium includes all kinds of recording apparatuses in which data that can be read by a computer system is stored. That is, a computer-readable recording medium includes a magnetic storage medium (e.g., ROM, floppy disk, hard disk, etc.), an optical reading medium (e.g., CD ROM, And the like). The computer-readable recording medium may also be distributed over a networked computer system so that computer readable code can be stored and executed in a distributed manner.

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

(Explanation of Symbols)

100: Master unit 200: Remote unit

10: base station 30: hub unit

110-1 and 250-2: A / D converters 110-2 and 250-1: D / A converters

120, 240: Signal processing units 130-1, 230-2: Framers

140, 220: routers 141, 221: second framer

143, and 223: routing control units 150-1 and 210-2:

150-2, 210-1: optical / electric converter

CROSS-REFERENCE TO RELATED APPLICATIONCROSS-REFERENCE TO RELATED APPLICATION

This patent application is related to Korean Patent Application No. 10-2017-0181470 filed on Dec. 27, 2017, which is hereby incorporated by reference in its entirety, and Korean Patent Application filed on October 5, 2018 No. 10-2018-0118653.

Claims

A method performed at a node unit of a Distributed Antenna System (DAS)

Converting each of at least one RF (Radio Frequency) signal transmitted from the outside into a discrete signal;

Extracting a downlink signal included in the discrete signal; And

And routing the extracted downlink signal to one or more lower node units that make up the DAS. &Lt; Desc / Clms Page number 20 >
The method according to claim 1,

Further comprising the step of, after the extracting step, arranging the extracted downlink signal in one or more frames composed of one or more sub-frames having a preset bandwidth,

Wherein the disposing comprises:

Dividing the extracted downlink signal into subframe units,

Wherein the routing comprises:

And a downlink signal divided and arranged in units of subframes is routed in units of subframes.
3. The method of claim 2,

Wherein the at least one downlink signal is divided into the different frames based on the frequency band of the downlink signal.
4. The apparatus of claim 3,

Wherein the number of subframes is varied according to a data amount of the downlink signal to be arranged.
5. The method of claim 4, wherein the bandwidth of the sub-

And varying the amount of data of the downlink signal to be allocated.
3. The method of claim 2,

Wherein each of the sub-frames is relocated to each of at least one second sub-frame constituting one or more second frames according to a preset correspondence relationship.
7. The method of claim 6,

Wherein the signal is updated according to a command input from the outside.
As a node unit of a distributed antenna system (DAS)

A converter for converting each of at least one RF (Radio Frequency) signal transmitted from the outside into a discrete signal;

A signal processor for extracting a downlink signal included in the discrete signal; And

And a router for routing the extracted downlink signal to one or more lower node units constituting the DAS.
9. The method of claim 8,

Further comprising a framer for arranging the extracted downlink signal in one or more frames constituted by one or more sub-frames having a preset bandwidth,

The framer comprises:

Dividing the extracted downlink signal into subframe units,

The router includes:

And a downlink signal which is divided and arranged in units of subframes is routed in units of subframes.
10. The framer of claim 9,

Wherein the at least one downlink signal is divided into the different frames based on the frequency band of the downlink signal.
11. The method of claim 10,

Wherein the number of subframes is variable according to a data amount of the downlink signal to be arranged.
12. The method of claim 11, wherein the bandwidth of the sub-

And wherein the node unit is variable according to a data amount of the downlink signal to be allocated.
10. The system according to claim 9,

A second framer to rearrange each of the sub-frames in each of at least one second sub-frame constituting one or more second frames; And

And a routing controller for controlling relocation of the second framer according to a preset correspondence relationship.
14. The apparatus of claim 13,

And updates the correspondence relationship according to a command input from the outside.
9. The method of claim 8,

The node unit comprising:

A master unit implemented as a card type module,

The card-type module includes:

Wherein the DAS is physically connected to and disconnected from the dedicated slot formed in the DAS, and is electrically connected to and disconnected from the DAS.