KR102475968B1 - Signal precessing and transport architecture of distributed antenna system - Google Patents

Abstract

A signal processing method and node unit of multi-operating DAS are disclosed.
According to an embodiment of the present invention, as a method performed in a node unit of a Distributed Antenna System (DAS), each of one or more Radio Frequency (RF) signals transmitted from the outside is converted into a discrete signal. converting to; 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

Signal processing and transmission architecture of DAS {SIGNAL PRECESSING AND TRANSPORT ARCHITECTURE OF DISTRIBUTED ANTENNA SYSTEM}

The present invention relates to a Distributed Antenna System (DAS), and more particularly, improves communication quality by relaying mobile communication between a base station and a terminal using a digitized and standardized signal, as well as changes in the communication environment. It relates to a signal processing method and node unit of a multi-operating DAS that can immediately respond to

The information described in this section simply provides background information on the present invention and does not constitute prior art.

In order to maintain the quality of mobile communication service, there is a need to establish a base station at the right place. However, since the establishment and operation of base stations requires a lot of cost and a certain area of installation space is required, it can be said that there are cost and space limitations to install base stations in all locations where service quality can be maintained or improved.

In order to overcome these limitations, a separate communication relay system for relaying mobile communication is built in places where radio interference or physical barriers exist, such as inside buildings, subways, underpasses, tunnels, etc. Among the separate communication relay systems, a representative one is the Distributed Antenna System.

The distributed antenna system may be composed of a Master Unit (MU), which may be referred to as a node unit, and a plurality of Remote Units (RUs) connected to the Master Unit.

The master unit relays communication between the base station and remote units, and the remote units are evenly distributed and installed throughout the mobile communication service area to relay communication with the user's mobile communication terminal. In addition, the remote unit can provide a communication service to a mobile communication terminal located at a cell boundary by forming a virtual cell.

As such, the conventional distributed antenna system has an advantage in that it can implement smooth mobile communication between a base station and a mobile communication terminal by eliminating local shadow areas through communication relay between the master unit and the remote unit, but provides limited communication quality. It also has a limitation that it cannot immediately respond to fluid changes in the communication environment.

Specifically, the conventional distributed antenna system relays the RF signal (downlink) transmitted from the base station to the mobile communication terminal and relays the RF signal (uplink) transmitted from the mobile communication terminal to the base station. Since the RF signal to be used includes a plurality of signals having different frequency bands, mutual interference may occur between them, and in this case, communication quality may be deteriorated.

In addition, the data throughput of the conventional distributed antenna system is fixed according to the average communication data volume of the place or building where it is installed. Therefore, when a temporary or continuous increase in the amount of communication data occurs in the relevant place or building, much costly and time-consuming work such as additional hardware expansion and firmware update must be performed to cover the increased data amount. It can be said that it has certain limitations in responding immediately and flexibly to changes in

An embodiment of the present invention is configured to digitize an RF signal and use it for communication relay, thereby preventing interference between signals of different frequency bands, thereby further improving communication quality. The main purpose is to provide a signal processing method and node unit of

In addition, another embodiment of the present invention is a signal processing method and node of a multi-operating DAS capable of further improving accuracy and immediate response to communication relay because it is configured to implement communication relay in units of standardized and variable frames. Its main purpose is to provide units.

According to an embodiment of the present invention, as a method performed in a node unit of a Distributed Antenna System (DAS), each of one or more Radio Frequency (RF) signals transmitted from the outside is converted into a discrete signal. Converting to; extracting a downlink signal included in the discrete signal; and routing the extracted downlink signal to one or more lower node units constituting the DAS.

According to another embodiment of the present invention, as a node unit of a Distributed Antenna System (DAS), each of one or more RF (Radio Frequency) signals transmitted from the outside is converted 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.

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

In addition, the present invention is configured to arrange a digitized signal in a standardized frame and use the frame as a basic unit of communication relay to relay a plurality of communication signals having different frequency bands to an effective destination, so accuracy for communication relay is configured. can be further improved.

Furthermore, since the number of sub-frames constituting a frame, bandwidth, etc. are variably adjustable according to changes in the communication environment, it is possible to more promptly and flexibly respond to a flexible communication environment.

In addition, since the present invention is implemented in the form of a card module that can be physically and electrically connected to and connectable to the distributed antenna system, communication data throughput can be adjusted with a simple act of connecting and disconnecting the card module to the distributed antenna system. The effect of being able to respond promptly and flexibly to the data environment can be further increased.

1 is a diagram showing the overall structure of a distributed antenna system including a master unit of the present invention.
2 is a schematic block diagram of a master unit according to an embodiment of the present invention.
3 is a flowchart illustrating a process in which a master unit relays communication from a base station to a terminal according to the present invention.
4 is a flowchart illustrating a process in which a master unit relays communication from a terminal to a base station according to the present invention.
5 is a schematic block diagram of a remote unit according to an embodiment of the present invention.
6 is a flowchart illustrating a process in which a remote unit of the present invention relays communication from a base station to a terminal.
7 is a flowchart illustrating a process in which a remote unit relays communication from a terminal to a base station according to the present invention.
8 is a diagram for explaining an embodiment of the present invention in which digitized communication signals are arranged in a standardized frame.
9 is a diagram for explaining an embodiment of the present invention for routing standardized communication signals.
10 to 12 are diagrams for explaining various embodiments in which a distributed antenna system including a master unit relays a communication signal according to the present invention.

Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. In adding reference numerals to components of each drawing, it should be noted that the same components have the same numerals as much as possible even if they are displayed on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description will be omitted.

Also, terms such as first, second, A, B, (a), and (b) may be used in describing the components of the present invention. These terms are only used to distinguish the component from other components, and the nature, order, or order of the corresponding component is not limited by the term. Throughout the specification, when a part 'includes' or 'includes' a certain component, it means that it may further include other components without excluding other components unless otherwise stated. . In addition, the '... Terms such as 'unit' and 'module' refer to a unit that processes at least one function or operation, and may be implemented as hardware, software, or a combination of hardware and software.

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

As shown in FIG. 1, the distributed antenna system may include a master unit 100 and one or more remote units 200-n, and one or more slave master units according to embodiments. (100-n), it may be configured to further include one or more hub units (30-n).

The master unit 100, the remote unit 200, the hub unit 30, and the antenna shown in FIG. 1 correspond to node units of a distributed antenna system, and the present invention is a master unit among these node units ( 100) and the remote unit 200 itself or a signal processing method in the master unit 100 and the remote unit 200.

In the case of downlink where mobile communication is implemented from the base station 10 to the terminal, the master unit 100 of the present invention receives an analog radio frequency signal of the RF band from the base station 10 and converts it into a digitized signal. Then, the downlink communication between the base station 10 and the terminal (not shown) is relayed by directly transmitting the converted signal to the remote unit 200 or transmitting it through the hub unit 30-n.

In the case of uplink in which mobile communication is implemented from the terminal to the base station 10, the master unit 100 of the present invention directly receives the digitized signal from the remote unit 200 or transmits it through the hub unit 30-n By transmitting the received and transmitted signal to the base station 10, the uplink communication between the terminal and the base station 10 is relayed.

In the case of downlink, the remote unit 200 of the present invention separates signals transmitted from the master unit 100 for each frequency band, reconverts the separated signals into analog radio frequency signals of the RF band, and then reconverts the The signal is transmitted to the terminals located in the cell in charge of the terminal through the antenna 40 connected to the terminal.

In the case of uplink, the remote unit 200 of the present invention receives analog radio frequency signals in the RF band from terminals located in its cell, converts them into digitized signals, and converts the converted signals into the present invention. The uplink communication between the base station 10 and the terminal is relayed by directly transmitting to the master unit 100 or transmitting through the hub unit 30-n.

1 shows an example of the configuration of a distributed antenna system, the distributed antenna system is an installation area and application field such as in-building, subway, hospital, stadium, etc. Various structural modifications are possible considering the specificity of For example, the number of each of the master unit 100, the remote unit 200, and the hub unit 30 or the connection relationship between them may also be configured differently from the structure shown in FIG. 1.

Also, in the distributed antenna system, the hub unit 30-n is used when the number of links to be branched from the master unit 100 is limited compared to the number of remote units 200 that need to be installed. Therefore, the hub unit 30-n may be omitted when a single master unit 100 alone can sufficiently handle the number of remote units 200 or when a plurality of master units 100 are installed.

When the hub unit 30-n is composed of a plurality, the master unit 100 of the present invention can selectively transmit the digitized signal to the plurality of hub units 30-n, so that the hub unit 30-n ), it is possible to configure a separate cell for each.

The slave master unit 100-n shown in FIG. 1 corresponds to a configuration that is additionally connected when an interface extension of the base station 10 is required. Specifically, when a large number of people (terminals) are concentrated in a building, subway, hospital, stadium, etc. where a distributed antenna system is implemented and the communication data throughput increases, the slave master unit 100-n is additionally configured. The increased mobile communication data can be processed 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 are card-type modules that can be connected (connected) and disconnected from the distributed antenna system through dedicated slots or connection terminals formed in the distributed antenna system. can be made into a shape.

Connection and disconnection between the card-type module and the distributed antenna system include all 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 being physically connected to and disconnected from the distributed antenna system through a dedicated slot formed in the distributed antenna system.

In this way, if 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 communication data throughput can be reduced by simply connecting and disconnecting the card module to the distributed antenna system. Since it can be adjusted, the master unit 100 and the slave master unit 100-n of the present invention can provide an effect that responds promptly and flexibly to a flexible data environment.

A signal transport medium or signal transmission method between nodes (a master unit, a remote unit, a hub unit, a slave master unit, etc.) may be implemented through various methods.

For example, between the master unit 100 and the hub unit 30-n, between the master unit 100 and the remote unit 200 that is directly connected are connected with an optical cable, and the remote unit 200 connected in a cascade Each other may be implemented in a manner in which they are connected through an RF cable, a twisted cable, a UTP cable, or the like. Of course, even between the master unit 100 and the remote unit 200 directly connected, it may be connected through an RF cable, a twisted cable, a UTP cable, or the like.

Hereinafter, between the master unit 100 and the hub unit 30-n, between the hub units 30-n, between the master unit 100 and the slave master unit 100-n, and between the hub units 30-n ) and the remote unit 200 are connected through an optical cable, and internal components of the master unit 100 are connected through a backplane link.

2 is a block diagram schematically showing a master unit 100 according to an embodiment of the present invention, and FIG. 3 is a master unit 100 of the present invention performs communication (downlink) from the base station 10 to the terminal. It is a flow chart for explaining a relaying process, and FIG. 4 is a flowchart for explaining a process for relaying communication (uplink) from a terminal to a base station 10 by the master unit 100 of the present invention.

Hereinafter, with reference to FIGS. 2 to 4, sub-components constituting the master unit 100 of the present invention and a method for the master unit 100 to relay communication through these sub-components, that is, a signal processing method to explain in detail.

Regarding the order of explanation, a method for relaying the downlink by the master unit 100 of the present invention will be described first, and then a method for relaying the uplink will be described later.

As shown in FIG. 2, the master unit 100 of the present invention includes an A/D converter 110-1, a D/A converter 110-2, a signal processing unit 120, a router 140, It may include a photoconverter 150-1 and a photo/electric converter 150-2.

First, in the case of downlink, when one or more RF signals are received from the base station 10 (S310), the A/D converter 110-1 of the present invention converts the received RF signal into a digitized signal, that is, discrete It is converted into a 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/or for each mobile operator. 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 extracts a downlink signal from the discrete signal by applying digital signal processing (DSP) to the discrete signal (S330).

Specifically, the signal processor 120 of the present invention removes noise included in the discrete signal by filtering the discrete signal using a digital filter, and down-converts the frequency of the discrete signal from which the noise has been removed to baseband data or user data. A downlink signal corresponding to is extracted (S330).

According to an embodiment, the signal processing unit 120 of the present invention further includes a component (eg, a low-noise amplifier) (not shown) for amplifying the attenuated signal in the process of being transmitted from the base station 10. can be configured to include

If the RF signal is a plurality of RF signals having different frequencies for each band and/or mobile communication company, as described above, the A/D converter 110-1 converts each of the plurality of RF signals into a plurality of discrete signals. And (S320), the signal processing unit 120 of the present invention can extract a plurality of downlink signals from each of a 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 means a process of selecting a path through which a downlink signal is transmitted between the master unit (link of the master unit) 100 and the remote unit 200 .

The router 140 of the present invention can select a path through which a downlink signal is transmitted based on the identity of a frequency band between a specific downlink signal and a specific remote unit 200, the identity of frequencies according to differences in mobile carriers, and the like. .

When the routing is completed, the electric/optical converter 150-1 of the present invention converts the downlink signal, which is an electrical signal, into an optical discrete signal (S350), and converts the optical discrete signal to a sub-unit (remote unit or hub) through Optic Link. unit) to complete downlink relaying.

The conversion to a discrete optical signal through an electric/optical converter 150-1 or an optical/electrical converter 150-2 described below is performed by the master unit 100 of the present invention and the sub units (remote unit and hub unit) and the optical discrete signal. It is assumed that they are connected via cables.

Therefore, when the master unit 100 of the present invention is connected to the lower unit using another method such as an RF cable, twisted cable, UTP cable, etc., the master unit 100 of the present invention has a separate conversion configuration corresponding thereto. It is preferable to be configured to include.

Next, in the case of uplink, the optical/electric 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 an A/D conversion process in the remote unit 200.

Since the uplink signal corresponds to a signal transmitted from one or more terminals to the master unit 100 (finally a base station) through one or more remote units 200, the uplink signal includes various frequency bands used for communication by each terminal. of signals may be included.

Therefore, the router 140 of the present invention routes each of the uplink signals of various frequency bands and separates or classifies the uplink signals of the various frequency bands for each frequency band (based on the frequency band) (S430).

The signal processing unit 120 of the present invention may frequency up-convert the uplink signals classified for each frequency band to convert them into a carrier band or perform a function of amplifying the uplink signals 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 uplink relaying. Do (S450).

As such, the present invention converts an analog signal (RF signal) transmitted from the base station 10 or a terminal into a digital signal (discrete signal), and uses the discrete signal to relay mobile communication, so that different frequency bands are configured. It is possible to fundamentally block the occurrence of interference between analog signals having , so that further improved communication quality can be provided.

2 shows a form in which the electric/optical converter 150-1 and the optical/electrical converter 150-2 of the present invention are implemented as separate configurations, but according to the embodiment, the electric/optical converter 150-1 ) and the optical/electronic converter 150-2 may be implemented as a single component to perform a process of converting an electrical discrete signal into an optical discrete signal and converting an optical discrete signal into an electrical discrete signal.

2 shows a form in which the router 140 of the present invention is implemented in a single configuration, but according to an embodiment, the router 140 of the present invention includes a downlink-only router 140 for setting a downlink path and an uplink router 140. It may also be implemented in a separate form, such as the uplink-only router 140 that configures the link path.

2 shows a form in which the signal processing unit 120 of the present invention is implemented in a single configuration, but according to the embodiment, the signal processing unit 120 of the present invention is a downlink-only signal processing unit for processing downlink signals ( 120) and an uplink dedicated signal processing unit 120 that processes uplink signals.

2 shows a form in which the A/D converter 110-1 and the D/A converter 110-2 of the present invention are implemented as separate configurations, but according to the embodiment, the A/D converter 110-1 ) and the D/A converter 110-2 may be implemented as a single component.

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

Hereinafter, with reference to FIGS. 5 to 7, sub-elements constituting the remote unit 200 of the present invention and a method for the remote unit 200 of the present invention to relay communication through these sub-elements (signal processing method) to explain in detail.

With regard to the order of description, a method of relaying downlink by the remote unit 200 of the present invention will be described first, and then a method of relaying uplink will be described later.

As shown in FIG. 5, the remote unit 200 of the present invention includes an optical/electric converter 210-1, an electric/optical converter 210-2, a router 220, a signal processor 240, a D/ It may be configured to include an A converter 250-1 and an A/D converter 250-2.

First, in the case of downlink, the optical/electrical converter 210-1 of the present invention electrically discretes the optical discrete signal received through the Optic Link from the master unit 100 or hub unit 30 of the present invention (S610). It is converted into a signal (S620).

As described above, since the electrical discrete signal includes downlink signals of various frequency bands (bands), the router 220 of the present invention transmits these downlink signals for each frequency band (frequency band) through a routing or switching operation. Or based on the band) is separated or separated (S630).

The signal processing unit 240 of the present invention performs a function of frequency up-converting to a carrier frequency band by applying DSP to downlink signals classified by frequency band or amplifying them so that they can reach the base station 10. It can be done (S640).

The D/A converter 250-1 of the present invention converts the downlink signal (discrete signal) that has passed through the signal processing unit 240 into an analog signal (S650), and transmits the converted signal through the antenna 40 connected thereto. It is transmitted to terminals within its own coverage (S660).

Next, in the case of uplink, the A/D converter 250-2 of the present invention receives uplink RF signals of various frequency bands from terminals through the antenna 40 (S710), and converts these signals into digitized discrete signals. It is converted into a signal (S720).

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

When the RF signal is composed of a plurality of analog signals having different frequencies for each band and/or mobile communication company, as described above, the A/D converter 250-2 transforms each of the plurality of signals into a plurality of discrete signals. After conversion, 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 transmitted between the link of the master unit 100 and the remote unit 200 .

In the router 220 of the present invention, the identity of frequency bands between a specific uplink signal and a specific master unit 100 (link of the master unit), the identity of frequencies according to mobile communication companies, the identity of multiplexing schemes such as TDD and FDD, etc. Based on (correspondence relationship), a path through which an uplink signal is transmitted is selected.

When the routing is completed, the electric/optical converter 210-2 of the present invention converts the uplink signal, which is an electrical signal, into an optical discrete signal, and transmits the optical discrete signal to a higher unit (master unit or hub unit) through Optic Link. By transmitting, uplink relaying is completed (S750).

5 shows a form in which the electric/optical converter 210-2 and the optical/electric converter 210-1 of the present invention are implemented as separate components, but according to the embodiment, the electric/optical converter 210-2 ) and the photo/electric converter 210-1 may be implemented as a single component.

5 shows a form in which the signal processing unit 240 of the present invention is implemented in a single configuration, but according to the embodiment, the signal processing unit 240 of the present invention is a downlink dedicated signal processing unit ( 240) and an uplink dedicated signal processing unit 240 that processes uplink signals.

5 shows a form in which the router 220 of the present invention is implemented in a single configuration, but according to an embodiment, the router 220 of the present invention includes a downlink dedicated router 220 for setting a downlink path, and It may be implemented in a separate form, such as the uplink-only router 220 that configures the uplink path.

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

Hereinafter, with reference to FIGS. 2 to 8, 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 for technical features of the present invention. let me explain

The master unit 100 and the remote unit 200 of the present invention arrange the digitized downlink signal or uplink signal in one or more preset frames 50 (S331, S735), and based on the frame 50 It may be configured to implement internal transmission for communication signals.

To this end, the master unit 100 and the remote unit 200 of the present invention, as shown in FIGS. 2 and 5, framers 130-1 and 230-2 and deframers 130-2 and 230-1 ) may be further included.

The framers 130-1 and 230-2 are components for arranging the downlink signal or uplink signal extracted from the discrete signal in the frame 50, while the deframers 130-2 and 230-1 are the downlink signal Alternatively, it corresponds to a configuration in which the arrangement of uplink signals is released from the frame 50 (deframing).

Here, the frame 50 corresponds to a term referring to 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 constitutes a downlink signal or an uplink signal in a specific unit, and means the specific unit in the case of using the signals in the specific unit as a unit of internal transmission.

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

In FIG. 8, with respect to the framers 130-1 and 230-2 or the deframers 130-2 and 230-1, signals located on the left represent unframed signals or signals extracted from frames, and A signal located at indicates a framed signal.

The framers 130-1 and 230-2 of the present invention place the downlink signal (master unit) or uplink signal (remote unit) extracted from the signal processors 120 and 240 in one or more preset frames 50. Do (S331, S735).

This frame 50 is composed of one or more sub-frames 50-n having preset bandwidths. Accordingly, the framers 130-1 and 230-2 of the present invention divide the downlink signal or the uplink signal into subframe units (band width units of subframes) 50-n, and divide the divided signals into respective subframes. It can be arranged in the frame 50-n (S331, S735).

The number (n) of subframes constituting the frame 50, the bandwidth of each subframe 50-n, and the like determine whether more or less resources should be allocated to a user's setting, communication environment, and a specific frequency band. It can be set variably according to necessity and the like. Also, each of the subframes 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 these frequency bands consists of three subframes 50 -1, 50-2, 50-3), whereas frames for other frequency bands may consist of 6 subframes 50-1 to 50-6.

This is because the communication data throughput for the corresponding frequency band (800 MHz frequency band and 1.7 GHz frequency band) is relatively small, so that data processing is possible with only three subframes (50-1, 50-2, 50-3), This is an example showing that the number of frames) can be set variably.

In addition, as shown in FIG. 8 (2.1 GHz frequency band), the bandwidth of each of the subframes 50-n constituting the same frame 50 is variable according to the data amount of the downlink signal allocated to it. can be set to

In this way, when a downlink signal or an uplink signal is arranged in the frame 50, the routers 140 and 220 of the present invention perform routing in units of subframes 50-n to perform routing in units of subframes 50-n. The downlink signal or uplink signal divided into and arranged is routed (S340).

Next, in the case of the uplink signal (the left direction of the double-headed arrow), the deframers 130-2 and 230-1 of the present invention release the frame 50 from the framed signal to generate the downlink from the frame 50. signal or uplink signal is extracted.

When the frame 50 is released, downlink signals or uplink signals divided and arranged in units of subframes 50-n are interconnected, and serial discrete signals of a specific frequency band are generated through this process (S435, S635).

9 is a diagram for explaining an embodiment of the present invention for routing standardized communication signals. Hereinafter, with reference to FIGS. 2 to 9, technical features of the present invention in which framed downlink signals or uplink signals are routed in units of frames 50 will be described.

As described above, when the processing to place the downlink signal or uplink signal in the frame 50 is completed, the routers 140 and 220 of the present invention route the frame 50 itself and place it in the frame 50. routed downlink or uplink signals.

In the case of the above-described embodiment in which the frame 50 is composed of one or more subframes 50-n and the downlink signal or uplink signal is divided and arranged in units of the subframe 50-n, the router of the present invention ( 140 and 220 may be configured to route in units of subframes 50-n.

In order to implement this routing process, the routers 140 and 220 of the present invention relocate the subframe 50-n to a new frame (hereinafter referred to as a 'second frame') 60. , 221) and routing controllers 143 and 223 that control the rearrangement operation of the second framers 141 and 221 according to a preset correspondence relationship.

In FIG. 9, the frames 50 arranged on the left correspond to the frames used in the framers 130-1 and 230-2 (hereinafter referred to as 'first frames'), and the frames arranged on the right correspond to the frames of the present invention. Corresponds to the second frame 60 used in the routers 140 and 220.

9, the first frame 50 is composed of 6 sub-frames 50-1 to 50-6 and the second frame 60 is composed of 12 second sub-frames 60-1 to 60-12. Although the form is expressed, as described above with respect to the first frame 50, the number of second subframes 60-n constituting the second frame 60, each of the second subframes 60-n The bandwidth of can be set variably according to the user's setting, communication environment, the need to allocate more or less resources to a specific frequency band, and the like. Also, each of the second subframes 60-n may be set to have different bandwidths.

With the second subframe 60-n configured as described above, the second framers 141 and 221 of the present invention transmit information in the downlink direction (master unit) or uplink direction (remote unit) in the frame of the 800 MHz frequency band. Based on , the first subframe 50-1 is the first second subframe 60A-1 of the second frame 60A, and the second subframe 50-2 is the second frame 60A. The subframe 50-n according to a preset correspondence relationship, such as arranging the second subframe 60A-2 of and the third subframe 50-3 as the third second subframe 60A-3. may be relocated to the second subframe 60-n (S341, S741).

In addition, in the uplink direction (master unit) or downlink direction (remote unit), the first second subframe 60A-1 is the first subframe 50-1, and the second second subframe 60A -2) is the second subframe 50-2, and the third second subframe 60A-3 is relocated to the third subframe 50-3 according to the preset correspondence relationship. (60-n) can be rearranged to the subframe (50-n) (S431, S631).

As such, the present invention arranges a digitized signal in a standardized frame 50, utilizes the frame 50 as a basic unit of communication relay, and uses a plurality of communication signal frames (subframes) having different frequency bands. Since it is configured to be rearranged as a unit and relayed to an effective destination, various communication signals of different frequency bands can be relayed more accurately.

The relocation rule, that is, the correspondence relationship is variable according to the communication environment, the need to allocate more or less resources to a specific frequency band, the duplexing method of the remote unit 200 corresponding to the lower unit based on the downlink direction, and the like. can be set to

For example, Link A represented in FIG. 9 corresponds to a route routed to the remote unit 200 of the FDD duplexing scheme, and Link B represented in FIG. 9 is routed to the remote unit 200 of the TDD duplexing scheme. may correspond to the path. Of course, both Link A and Link B may be configured to be used as a routing path of either an FDD duplexing scheme or a TDD duplexing scheme, depending on the communication environment.

Such a corresponding relationship may be set in advance and stored in the routing controllers 143 and 223 of the present invention, and may have various forms such as a routing table. In addition, according to the embodiment, the routing controllers 143 and 223 of the present invention are configured to control only the relocation based on the correspondence relationship, and the correspondence relationship such as the routing table is stored in a separate configuration such as a storage unit (not shown). may be configured to do so.

In addition, as shown in FIG. 2 , the routing controllers 143 and 223 of the present invention may be configured to update corresponding relationships stored in their own or separate storage units according to commands input from the outside.

As described above, since the present invention is configured to change paths of a plurality of communication signals through a simple command input, it can provide an effect capable of responding flexibly and immediately to changes in the communication environment.

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

First, FIG. 10 shows an embodiment of the present invention in which a lot of communication data is processed by additionally using the slave master units 100-1 and 100-2. When RF signals of a plurality of frequency bands are transmitted from each of the 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, slave master unit). (100-1, 100-2)) receives and performs the above-described processing such as downlink extraction, framing, and routing.

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

Since 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, FIG. 10 As shown in , only the downlink signals K1, D1, Y1, S1, W1, B1 and U1 received from the base station 1 10-1 are in the remote units 200-1 to 200-12, respectively. It is separated and relayed by frequency band.

Remote units 200-13 to 200-24 connected to hub unit 2 (30-2) are remote units 200-13 to 200-24 communicating with base stations 1 (10-1) and 2 (10-2). Since it corresponds to , as shown in FIG. 10, the remote units 200-13 to 200-24 have downlink signals K1, D1, Y1, S1, and W1 received from base station 1 10-1. and B1) and the downlink signals K2, D2, U2, and S2 received from base station 2 (10-2) are separated for each frequency band and relayed.

The remote units 200-49 to 200-60 connected to the hub unit 5 (30-5) communicate with the base station 1 (10-1) and the base station 3 (10-3) (200-49 to 200-60). ), so as shown in FIG. 10, the remote units 200-49 to 200-60 have downlink signals Y1, D1, W1, B1, and K1 received from base station 1 10-1. ) and the downlink signals K3, D3, S3, and U3 received from base station 3 (10-3) are separated for each frequency band and relayed.

11 is a diagram showing an example in which the DAS including the master unit 100 of the present invention supports dual-band 4×4 MIMO (Multi Input Multi Output). As shown in FIG. 11, when a plurality of RF signals (2.5G_1, 3.5G_1, 2.5G_2 and 3.5G_2) corresponding to the 2.5GHz and 3.5GHz frequency bands are received from the base station 10, the master unit of the present invention ( 100) converts each of these RF signals into discrete signals, and routes the converted discrete signals (downlink signals) for each subframe 50-n to the hub unit 30-n to which the corresponding remote unit 200 is connected. 1, 30-2).

The hub units 30-1 and 30-2 that receive serial discrete signals (framed downlink signals) composed of one or more subframes 50-n transmit the remote unit 200 corresponding to each of the downlink signals. Each downlink signal is transmitted.

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

In addition, by the routing of the master unit 100 and relaying of the hub units 30-1 and 30-2, the framed downlink signals corresponding to the 2.5G_2 and 3.5G_2 frequencies are sent to the remote unit #200-2. , is transmitted to remote unit #14 (200-14), remote unit #24 (200-24), etc., and is provided to terminals within the coverage of each remote unit 200.

12 is a diagram showing an example in which the DAS including the master unit 100 of the present invention supports 2×2 MIMO for a 2.5G frequency band and 4×4 MIMO for a 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 2.5Ghz and 3.5GHz frequency bands are received from the base station 10, The master unit 100 converts each of these RF signals into discrete signals and routes the converted discrete signals (downlink signals) for each subframe 50-n to obtain a hub unit to which the corresponding remote unit 200 is connected. Send to (30-1, 30-2).

The hub units 30-1 and 30-2 that receive serial discrete signals (framed downlink signals) composed of one or more subframes 50-n transmit the remote unit 200 corresponding to each of the downlink signals. Each downlink signal is transmitted.

By routing of the master unit 100 and 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, so that all remote It is transmitted to the unit 200 and provided to the terminal.

Framed downlink signals corresponding to each of 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 corresponding frequency and provided to the terminal.

8 to 12, technical features of the present invention and various embodiments related to the technical features have been described based on frequencies of 800 MHz, 1.7 GHz, 2.1 GHz, 2.5 GHz, and 3.5 GHz bands, but this is generally It is only an example for highlighting the practicality or feasibility of the present invention by applying the applied frequency band as a reference.

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

In FIGS. 3, 4, 6, and 7, steps S310 to S350, S410 to S450, S610 to S660, and S710 to S750 are sequentially performed, but this is one aspect of the present invention. It merely exemplarily described the technical idea of the embodiment.

In other words, those skilled in the art to which an embodiment of the present invention pertains may change the order described in FIGS. 3, 4, 6, and 7 without departing from the essential characteristics of the embodiment of the present invention. or by executing one or more of steps S310 to S350, one or more of steps S410 to S450, one or more of steps S610 to S660, or one or more of steps S710 to S750 in parallel. 3, 4, 6, and 7 are not limited to a time-sequential order because they may be modified and modified.

Meanwhile, the processes shown in FIGS. 3, 4, 6 and 7 can be implemented as computer readable codes on a computer readable recording medium. A computer-readable recording medium includes all types of recording devices in which data that can be read by a computer system is stored. That is, computer-readable recording media include magnetic storage media (eg, ROM, floppy disk, hard disk, etc.), optical reading media (eg, CD-ROM, DVD, etc.) and carrier waves (eg, Internet Transmission through) and the same storage medium. In addition, the computer-readable recording medium may be distributed to computer systems connected through a network to store and execute computer-readable codes in a distributed manner.

The above description is merely an example of the technical idea of the present embodiment, and various modifications and variations can be made to those skilled in the art without departing from the essential characteristics of the present embodiment. Therefore, the present embodiments are not intended to limit the technical idea of the present embodiment, but to explain, and the scope of the technical idea of the present embodiment is not limited by these embodiments. The scope of protection of this embodiment should be construed according to the claims below, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of rights of this embodiment.

100: master unit 200: remote unit
10: base station 30: hub unit
110-1, 250-2: A/D converter 110-2, 250-1: D/A converter
120, 240: signal processing unit 130-1, 230-2: framer
140, 220: router 141, 221: second framer
143, 223: routing control unit 150-1, 210-2: electric/optical converter
150-2, 210-1: Photo/electric converter

Claims (15)

A method performed in a node unit of a Distributed Antenna System (DAS), comprising:
Converting each of one or more RF (Radio Frequency) signals transmitted from the outside into discrete signals;
extracting a downlink signal included in the discrete signal;
Dividing the extracted downlink signal into one or more sub-frames composed of one or more sub-frames having a preset bandwidth based on the frequency band of the downlink signal, placing; and
Routing the downlink signal divided and arranged in units of subframes in units of subframes to one or more lower node units constituting the DAS,
In the routing step,
Rearranging and routing each of the subframes to one or more second subframes constituting one or more second frames according to a preset correspondence relationship
A signal processing method of a multi-operating DAS characterized by delete delete The method of claim 1, wherein the frame,
The signal processing method of a multi-operating DAS, characterized in that the number of subframes varies according to the amount of data of the downlink signal to be arranged. The method of claim 1, wherein the bandwidth of the subframe is
A signal processing method of a multi-operating DAS, characterized in that the variable according to the data amount of the deployed downlink signal. delete The method of claim 1, wherein the correspondence relationship,
A signal processing method of a multi-operating DAS, characterized in that it 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 one or more RF (Radio Frequency) signals transmitted from the outside into discrete signals;
a signal processor for extracting a downlink signal included in the discrete signal;
Dividing the extracted downlink signal into one or more sub-frames composed of one or more sub-frames having a preset bandwidth based on the frequency band of the downlink signal, Framer to place; and
A router for routing the downlink signal divided and arranged in units of subframes to one or more lower node units constituting the DAS,
the router,
a second framer rearranging each of the subframes to one or more second subframes constituting one or more second frames; and
and a routing control unit controlling rearrangement of the second framer according to a preset correspondence relationship.
A node unit of a multi-operating DAS characterized by delete delete The method of claim 8, wherein the frame,
The node unit of the multi-operating DAS, characterized in that the number of subframes varies according to the amount of data of the downlink signal to be deployed. The method of claim 8, wherein the bandwidth of the subframe,
The node unit of the multi-operating DAS, characterized in that it is variable according to the amount of data of the downlink signal to be deployed. delete The method of claim 8, wherein the routing control unit,
A node unit of a multi-operating DAS characterized by updating the corresponding relationship according to a command input from the outside. According to claim 8,
The node unit,
It is a master unit implemented as a card-type module,
The card-type module,
A node unit of a multi-operating DAS characterized in that it is electrically connected to and disconnected from the DAS by being physically connected to and disconnected from a dedicated slot formed in the DAS.

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