KR102149420B1 - Distributed antenna system and service method thereof - Google Patents

Abstract

A service method of a distributed antenna system according to an embodiment of the present invention includes: receiving a frequency division duplex (FDD) carrier including a plurality of data for each of a plurality of service channels; Converting each of the plurality of service channels included in the received FDD carrier into a plurality of Time Division Duplex (TDD) carriers; And transmitting a plurality of transformed TDD carriers.

Description

Distributed antenna system and service method of distributed antenna system {DISTRIBUTED ANTENNA SYSTEM AND SERVICE METHOD THEREOF}

The technical idea of the present invention relates to a distributed antenna system and a service method of the distributed antenna system.

A distributed antenna system is an antenna system used to spatially distribute a plurality of antennas to solve a problem of high traffic capacity in an indoor environment or a predetermined area.

Distributed antenna systems are being installed inside buildings, tunnels, subways, etc. to provide communication services even in areas where base transceiver signals are difficult to reach, and are smoothly installed in stadiums, large facilities, and places with high demand for services. Used to provide services.

As described above, the distributed antenna system is a system for supplementing the limited output and coverage of a base station, and is widely used to eliminate a service shadow area.

In recent years, as communication services are developed mainly for data communication, distributed antenna systems are developing not only to expand a communication service area, but also to provide a combination of various services.

Meanwhile, since the distributed antenna system provides a communication service using a predetermined number of antennas in a limited space, a service provision capacity and a service provision range may be limited.

On the other hand, the amount of communication service usage and users are very flexible, and thus, a distributed antenna system having a fixed service provision capacity and a service provision range is somewhat limited.

The distributed antenna system and the service method of the distributed antenna system according to the technical idea of the present invention aim to improve the service signal output and expand the service area.

In addition, an object of the present invention is to efficiently provide a service signal by using a time division duplex or a frequency division duplex according to the location and service area of a service target terminal.

In addition, an object of the present invention is to allocate emergency channel resources for emergency calls so that emergency phone connections are always possible.

A service method of a distributed antenna system according to an aspect of the present invention includes receiving a frequency division duplex (FDD) carrier including a plurality of data for each of a plurality of service channels; Converting each of a plurality of service channels included in the received FDD carrier into a plurality of Time Division Duplex (TDD) carriers; And transmitting the converted plurality of TDD carriers.

According to an exemplary embodiment, the converting of the plurality of TDD carriers includes generating time division information for each of the plurality of service signals, and inserting the generated time division information into each of the plurality of TDD carriers. It may include steps.

According to an exemplary embodiment, the converting of the plurality of TDD carriers includes determining a transmission sector to which each of a plurality of service channels included in the FDD carrier is to be transmitted, and according to the determined transmission sector, the plurality of It may include converting each service channel into the TDD carrier.

According to an exemplary embodiment, the step of converting each of the plurality of service channels into the TDD carrier according to the determined transmission sector includes the plurality of service channels having the same determined transmission sector in one TDD carrier. It may include converting the same plurality of service channels into the TDD carrier.

According to an exemplary embodiment, the method includes the steps of: generating a subscriber detection assignment signal to which a subscriber detection channel for searching for a subscriber in a specific sector is allocated; And inserting the generated subscriber detection allocation signal between the generated plurality of TDD carriers.

According to an exemplary embodiment, the method includes: receiving a data request according to the subscriber detection allocation signal; And allocating a time for transmitting the TDD carrier to the sector in which the data request is received.

According to an exemplary embodiment, the step of generating an emergency service channel signal for an emergency call further comprises, and transmitting the converted plurality of TDD carriers comprises converting the generated emergency service channel signal to the converted plurality of TDD carriers. It may include transmitting in a guard period between carriers.

A main unit of a distributed antenna system according to another aspect of the inventive concept includes at least one processor; And a memory electrically connected to the at least one processor, wherein the memory includes a plurality of data for each of a plurality of service channels from at least one base station when the processor is executed. ) Instructions for receiving a carrier, converting each of the plurality of service channels included in the received FDD carrier into a plurality of Time Division Duplex (TDD) carriers, and transmitting the converted plurality of TDD carriers to a remote unit Can be saved.

According to an exemplary embodiment, the memory generates time division information for each of the plurality of service signals when the processor is executed, and inserts the generated time division information into each of the plurality of TDD carriers. You can save instructions.

According to an exemplary embodiment, when the processor is executed, the memory determines a transmission sector to which each of a plurality of service channels included in the FDD carrier is to be transmitted, and according to the determined transmission sector, the memory Instructions for converting each channel into the TDD carrier may be stored.

According to an exemplary embodiment, when the processor is executed, the memory converts the same plurality of service channels into the TDD carrier so that a plurality of service channels having the same determined transmission sector are included in one TDD carrier. You can save the instructions you do.

According to an exemplary embodiment, when the processor is executed, the memory generates a subscriber detection allocation signal to which a subscriber detection channel for searching for a subscriber in a specific sector is allocated, and the generated subscriber detection allocation signal Instructions to insert between the generated plurality of TDD carriers may be stored.

According to an exemplary embodiment, when the processor is executed, the memory receives a data request according to the subscriber detection allocation signal and allocates a time for transmitting a TDD carrier to a sector in which the data request is received. You can save the instructions to do it.

According to an exemplary embodiment, when the processor is executed, the memory generates an emergency service channel signal for an emergency call, and converts the generated emergency service channel signal to a guard period between the converted plurality of TDD carriers ( guard period) can be stored.

A distributed antenna system according to another aspect of the inventive concept includes a main unit and at least one remote unit, wherein the main unit receives a plurality of data for each of a plurality of service channels from at least one base station. Receives a frequency division duplex (FDD) carrier containing, converts each of the plurality of service channels included in the received FDD carrier into a plurality of time division duplex (TDD) carriers, and converts the converted plurality of TDD carriers to the The transmission may be performed to at least one remote unit, and the at least one remote unit may time-division and output the plurality of TDD carriers transmitted from the main unit to at least one terminal in a service area.

The distributed antenna system and the service method of the distributed antenna system according to the embodiments of the present invention may improve service signal output and expand a service area.

Further, according to the present invention, a service signal can be efficiently provided by using a time division duplex or a frequency division duplex according to the location and service area of a service target terminal.

In addition, according to the present invention, by allocating emergency channel resources for emergency calls, the emergency phone connection can always be possible.

Brief description of each drawing is provided in order to more fully understand the drawings cited in the detailed description of the present invention.
1 is a conceptual diagram of a distributed antenna system according to an embodiment of the present invention.
2 is a block diagram of a configuration of a main unit according to various embodiments of the present disclosure.
3 is a block diagram illustrating a configuration of a transceiver module according to various embodiments of the present disclosure.
4 is a block diagram showing the configuration of a hub unit according to various embodiments of the present disclosure.
5 is a block diagram illustrating a configuration of a remote unit according to various embodiments of the present disclosure.
6 is an exemplary diagram for switching a transmission method according to various embodiments of the present invention.
7 is an exemplary diagram for signal output from a remote unit according to various embodiments of the present invention.
8 is an exemplary diagram for transmission of time division information according to various embodiments of the present invention.
9 is an exemplary diagram for a service for one sector of a remote unit according to various embodiments of the present invention.
10 is an exemplary diagram of service signal transmission corresponding to one sector according to various embodiments of the present invention.
11 is an exemplary diagram for service concentration in a specific direction of one sector according to various embodiments of the present disclosure.
12 is an exemplary diagram of service signal transmission including time division information according to various embodiments of the present invention.
13 is an exemplary diagram for service signal transmission in different directions according to various embodiments of the present invention.
14 is an exemplary diagram for transmission of an allocation signal for subscriber detection according to various embodiments of the present invention.
15 is an exemplary diagram for emergency channel transmission according to various embodiments of the present invention.
16 is an exemplary diagram for transmitting an emergency channel signal according to various embodiments of the present invention.
17 is an exemplary diagram of a frequency division method to which an emergency signal is fixedly allocated according to various embodiments of the present disclosure.
18 is an exemplary diagram for a time division method in which an emergency signal is fixedly allocated according to various embodiments of the present disclosure.

The technical idea of the present invention is that various changes may be made and various embodiments may be provided, and specific embodiments will be illustrated in the drawings and described in detail. However, this is not intended to limit the technical idea of the present invention to a specific embodiment, it should be understood to include all changes, equivalents, and substitutes included in the scope of the technical idea of the present invention.

In describing the technical idea of the present invention, when it is determined that a detailed description of a related known technology may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted. In addition, numbers (eg, first, second, etc.) used in the description of the present specification are merely identification symbols for distinguishing one component from another component.

In addition, in the present specification, when one component is referred to as "connected" or "connected" to another component, the one component may be directly connected or directly connected to the other component, but specially It should be understood that as long as there is no opposing substrate, it may be connected or may be connected via another component in the middle.

In addition, terms such as "~ unit", "~ group", "~ character", and "~ module" described in the present specification mean a unit that processes at least one function or operation, which is a processor or microcomputer. Processor (Micro Processer), Micro Controller, CPU (Central Processing Unit), GPU (Graphics Processing Unit), APU (Accelerate Processor Unit), DSP (Digital Signal Processor), ASIC (Application Specific Integrated Circuit), FPGA It can be implemented by hardware or software such as (Field Programmable Gate Array), or a combination of hardware and software.

In addition, it is intended to clarify that the division of the constituent parts in the present specification is merely divided by the main function that each constituent part is responsible for. That is, two or more constituent parts to be described below may be combined into one constituent part, or one constituent part may be divided into two or more according to more subdivided functions. In addition, each of the constituent units to be described below may additionally perform some or all of the functions of other constituent units in addition to its own main function, and some of the main functions of each constituent unit are different. It goes without saying that it may be performed exclusively by.

Hereinafter, embodiments according to the technical idea of the present invention will be described in detail in order.

1 is a conceptual diagram of a distributed antenna system according to an embodiment of the present invention.

Referring to FIG. 1, a distributed antenna system 10 may include a Point Of Interest (POI) 30, a main unit 100, a hub unit 200, and a remote unit 300. Here, the POI 30 and the main unit 100 may be referred to as a head end, and the main unit 100 may be referred to as a head end.

The POI 30 may be connected to each of the plurality of base stations 1a to 1n, and may receive a base station signal corresponding to the downlink from the connected plurality of base stations 10a to 10n. In addition, the POI 30 may transmit the processed base station signal to the main unit 100.

The POI 30 can process signals transmitted from the base stations (BTS, 1a~1n) so that the distributed antenna system 10 can process them, and the terminal signals received and processed by the distributed antenna system 10 are transmitted to the base station. The signal can be processed so that it can be transmitted to (1a~1n).

For example, the POI 30 can attenuate the base station signal of a high power level and convert it to a level suitable for the distributed antenna system 10, and the base station signals transmitted from the base stations 1a to 1n are downlink and uplink. Can be separated by In addition, the POI 30 may attenuate the terminal signal processed by the distributed antenna system 10 to suit the base stations 1a to 1n.

Here, the POI 30 may also be referred to as a signal matching device.

The main unit 100 may be connected to the POI 30, the hub unit 200, and the plurality of remote units 300 through a communication medium. Here, the communication medium may include an optical fiber, a coaxial cable, or the like.

The main unit 100 may transmit the received base station signal to the hub unit 200 and the remote unit 300.

For example, the main unit 100 may convert an RF signal into a digital signal, and may distribute the converted digital signal to the hub unit 200 and the remote unit 300.

Specifically, the main unit 100 may distribute the converted digital signal so as to transmit the received RF signal to the remote unit 300 corresponding to the area to be output.

The main unit 100 may be connected to another main unit, and may transmit or receive a base station signal or a terminal signal with another main unit connected. Here, the base station signal may mean a downlink signal, and the terminal signal may mean an uplink signal.

The main unit 100 may distribute or redistribute capacity for communication services.

Further, the main unit 100 may perform signal conversion between a frequency division duplex method and a time division duplex method. For example, the main unit 100 may convert an FDD carrier into a TDD carrier and convert a TDD carrier into an FDD carrier. Here, the carrier may include data according to a service signal or may mean a service signal.

The main unit 100 may also be referred to as a DAU (Distribution & Aggregation Unit).

The configuration of the main unit will be described in detail with reference to FIG. 2.

2 is a block diagram of a configuration of a main unit 100 according to various embodiments of the present disclosure.

Referring to FIG. 2, the main unit 100 may include an RF module 110, a baseband module 120, a backplane 150, a transceiver module 170, and a power supply module 190. In addition, the main unit 100 may include a channel scanner 180 to be described later or may be connected to an external device, which is a channel scanner 180.

The RF module 110 may include a plurality of RF modules 111 to 119.

In an embodiment, each of the plurality of RF modules 111 to 119 may receive and transmit RF signals of different bands.

In another embodiment, each of the plurality of RF modules 111 to 119 may be connected to a different base station to receive a downlink signal and transmit an uplink signal.

The RF module 110 may attenuate the downlink signal and convert the downlink signal into a digital signal. For example, the RF module 110 may attenuate an RF signal, which is a downlink signal, and convert it into a digital signal.

The RF module 110 may convert and amplify the uplink signal into an RF signal. For example, the RF module 110 may convert and amplify a digital signal, which is an uplink signal, into an RF signal.

The RF module 110 may include an analog to digital converter (ADC) and a digital to analog converter (DAC) for conversion between an analog signal and a digital signal.

The baseband module 120 may include a digital signal interface and may receive a digital signal.

Specifically, the baseband module 120 may interface to receive digital signals of standards such as Common Public Radio Interface (CPRI) and Open Baseband Remote Radiohead Interface (OBSAI).

For example, the baseband module 120 may interface with C-RAN (Centralized Radio Access Networks, Cloud-RAN), RAX, and integrated all-in-one BTS (BTS).

The backplane 150 may be connected to the POI 30, the RF module 110, the baseband module 120, the transceiver module 170, and the power supply module 190. For example, the backplane 150 may include at least one or more types of interface modules that can be connected to the above-described components. Thus, the backplane 150 may form a data bus structure in the main unit 100.

The backplane 150 may distribute signals and power, and may perform high speed signal routing. In addition, the backplane 150 may provide power and I/O signals to the POI 30.

The backplane 150 may also be referred to as a main board.

The transceiver module 170 may be connected to the hub unit 200 and the remote unit 300.

The transceiver module 170 may interface between the RF module 110, the baseband unit 120, the hub unit 200, and the remote unit 300.

Also, the transceiver module 170 may support expansion for interfacing with other main units. Accordingly, the main unit 100 may be connected to another main unit through the transceiver module 170.

The transceiver module 170 may aggregate signals received from the RF module 110 and the baseband unit 120, and may distribute the signals to the hub unit 200 and the remote unit 300. For example, the transceiver module 170 may distribute the aggregated signal through an optical port to the hub unit 200 and the remote unit 300.

The transceiver module 170 may perform noise rejection filtering and rate conversion.

The transceiver module 170 may perform band allocation according to signal transmission, and may perform sectorization. In addition, the transceiver module 170 may perform SISO/MIMO signal routing.

The transceiver module 170 may control and monitor system status.

The configuration of the transceiver module 170 will be described with reference to FIG. 3.

3 is a block diagram illustrating a configuration of a transceiver module according to various embodiments of the present disclosure.

Referring to FIG. 3, the transceiver module 170 may include an FPGA 171, a CPU 173, and a spectrum analysis module 175.

The Field Programmable Gate Array (FPGA) 171 and the Central Processing Unit (CPU) 173 may perform the functions of the transceiver module 170 described above.

The spectrum analysis module 175 may display and analyze a spectrum.

The spectrum analysis module 175 may display a spectrum waveform. For example, the spectrum analysis module 175 includes an ACLR (Adjacent Channel Leakage Power Ratio), a channel power, an OBW, and a spectrum emission mask. ), etc. can be displayed and analyzed.

The spectrum analysis module 175 may detect various pieces of information through analysis. For example, the spectrum analysis module 175 may detect a protocol, a carrier, a region, a band, MIMO, a sector, and the like.

In addition, the spectrum analysis module 175 may measure Error Vector Magnitude (EVM).

Refer back to FIG. 2.

The main unit 100 may include the channel scanner 180 or be connected to the channel scanner 180 that is an external device to obtain various information from the channel scanner 180.

The channel scanner 180 may also be referred to as a decode device or a decode subrack.

The channel scanner 180 includes a channel frequency of a received signal, a bandwidth, a mobile network code (MNC), a mobile country code (MCC), a channel power, a pilot power, Information related to Reference Signal Received Power (RSRP), cell ID (cell ID), and Single Input Single Output (SISO)/Multiple Input Multiple Output (MIMO) may be determined. In addition, the channel scanner 180 may transmit the determined information to at least one component included in the main unit 100.

Additionally, the channel scanner 180 may perform spectrum analysis of a received signal.

The power supply module 190 may convert input and output power. For example, the power supply module 190 may convert input and output power from alternating current (AC) to direct current (DC) or from DC to AC.

The description of the configuration of the main unit 100 described above is an example of description, and other configurations other than the above-described configuration may be further included, and some of the above-described configurations may not be included.

In addition, the main unit 100 may include at least one processor and a memory, and the execution words stored in the memory may be executed by the processor.

See FIG. 1 again.

Referring to FIG. 1, the hub unit 200 may be connected to the main unit 100 and the remote unit 300. For example, the hub unit 200 may be connected to the main unit 100 and a plurality of remote units 300 through an optical fiber.

The hub unit 200 may be connected between the main unit 100 and the remote unit 300 to expand the connection capacity of the remote unit 300 of the main unit 100. For example, the hub unit 200 may be connected to the main unit 100 and may be connected to the first to third remote units 300a to 300c. Accordingly, the main unit 100 may be directly connected to the fourth to nth remote units 300d to 300n, and may be connected to the first to third remote units 300a to 300c through the hub unit 200. have.

In another embodiment, the distributed antenna system 10 may be configured in a topology in which the remote unit 300 is connected to the main unit 100 through the hub unit 200.

The hub unit 200 may transmit a signal between the connected main unit 100 and the remote unit 300.

For example, the hub unit 200 may convert a digital signal transmitted from the main unit 100 into an Ethernet format and transmit data converted into the Ethernet format to the remote unit 300.

The hub unit 200 may supply power to the remote unit 300. For example, the hub unit 200 may supply power to the connected remote unit 300 through Power of Ethernet (PoE).

The hub unit 200 may monitor current for each of the connected plurality of remote units 300 and may automatically cut off power according to the monitoring.

Referring to Fig. 4, the configuration of the hub unit will be described.

4 is a block diagram showing the configuration of a hub unit according to various embodiments of the present disclosure.

Referring to FIG. 4, the hub unit 200 may include a transceiver module 270 and a power supply module 290.

The transceiver module 270 may include a port for interfacing with the main unit 100, and may include a port for interfacing with other hub units in a daisy chain form.

The transceiver module 270 may control and monitor the system state.

In addition, the transceiver module 270 may perform the function of the hub unit 200 described above.

The power supply module 290 may supply power to a component included in the hub unit 200 and may supply power to the connected remote unit 300.

See FIG. 1 again.

The remote unit 300 may be connected to the main unit 100 and may be connected to the main unit 100 through the hub unit 200.

The remote unit 300 may output a signal transmitted from the main unit 100 through an antenna, and may transmit a terminal signal received through the antenna to the main unit 100.

The remote unit 300 may be divided into high power and low power according to an output. A remote unit having a low output power may be referred to as a low power radio node, and a remote unit having a high output power may be referred to as a high power radio node.

The remote unit 300 may include an integrated antenna, and may be connected to an external antenna through an external antenna port.

Further, the remote unit 300 may include or be connected to a plurality of directional antennas, so that a signal may be transmitted to a specific area or a specific sector, and a signal from a specific area or a specific sector may be received. For example, the remote unit 300 may include at least one sector antenna or may be connected to a sector antenna. Further, the remote unit 300 may include or be connected to an omnidirectional antenna and a directional antenna.

The remote unit 300 may selectively operate only some of the built-in antennas and the external antennas.

The configuration of the remote unit 300 will be described with reference to FIG. 5.

5 is a block diagram illustrating a configuration of a remote unit according to various embodiments of the present disclosure.

Referring to FIG. 5, the remote unit 300 may include a transceiver module 370 and an RF module 380.

The transceiver module 370 and the RF module 380 may perform the functions of the remote unit 300 described above.

The transceiver module 370 may perform sectorization and MIMO signal routing.

The transceiver module 370 may convert a digital signal into a downlink RF signal, and may convert an uplink RF signal into a digital signal. In addition, the transceiver module 370 may apply digital filtering when converting the uplink RF signal into a digital signal.

The transceiver module 370 may perform system state control and monitoring.

The transceiver module 370 may support remote access through a WiFi connection.

The RF module 380 may include a built-in antenna, and may include a duplexer filter and/or a band pass filter (BPF) filter.

The RF module 380 may amplify and filter the downlink RF signal.

The RF module 380 may filter and amplify the uplink RF signal.

The RF module 380 may select connection and use between an internal antenna and an external antenna port. Further, the RF module 380 may include a mechanical connector for selection between an internal antenna and an external antenna port.

The built-in antenna built into the RF module 380 may be included in various combinations.

See FIG. 1 again.

A network management system (NMS) 50 may manage a network including the distributed antenna system 10. For example, the NMS 50 may monitor and control components included in the distributed antenna system 10, for example, the state and operation of one node.

The description of the above-described distributed antenna system 10 is an example for description and may be variously configured according to a designer or user's selection. Accordingly, in addition to the digital processing configuration described above, an analog processing configuration may be implemented, or a digital processing configuration and an analog processing configuration may be mixed.

Based on the configuration and description of the above-described distributed antenna system 10, the distributed antenna system 10 and the service method of the distributed antenna system 10 according to various embodiments of the present invention will be described.

The distributed antenna system 10 according to various embodiments of the present disclosure may change a transmission method of a service signal so as to improve output versus service and expand a service area. Here, the service area may also be referred to as a coverage area.

For example, the distributed antenna system 10 converts a signal received in a frequency division duplex method into a time division duplex method, and converts the converted signal in a time division duplex method in order to improve service. Can be output from the remote unit 300. In addition, the distributed antenna system 10 may convert a signal transmitted from the remote unit 300 in the TDD method to the FDD method. In addition, in an embodiment different from the above description, the distributed antenna system 10 converts the signal transmitted in the TDD method into the FDD method, outputs it from the remote unit 300, and receives it from the remote unit 300 in the FDD method. The resulting signal can be converted into a TDD signal.

Hereinafter, this will be described in detail.

6 is an exemplary diagram for switching a transmission method according to various embodiments of the present invention.

Referring to FIG. 6, the main unit 100 may receive an FDD carrier 500 as a downlink, convert the received FDD carrier 500 into a TDD carrier 600 and transmit it to the remote unit 300. In addition, the main unit 100 may receive the TDD carrier 700, which is an uplink, from the remote unit 300 and convert it into an FDD carrier 800.

Specifically, the main unit 100 includes first service channel data 510, second service channel data 520, and third service channel data 530, which are a plurality of downlink data corresponding to each of a plurality of service channels. It is possible to receive the included FDD carrier 500. The main unit 100 may convert the data for each of the different service channels included in the received FDD carrier 500 into a TDD carrier 600 so as to transmit data at different times. For example, the transceiver module 170 of the main unit 100 uses the FDD carrier 500 as a first TDD carrier 610 corresponding to first service channel data and a second TDD carrier corresponding to second service channel data. At step 620, it may be converted into a third TDD carrier 630 corresponding to the third service channel data. Here, the first service channel to the third service channel may refer to different providers, or may refer to service channels for different terminals. The main unit 100 may transmit the converted TDD carrier 600 to the remote unit 300. Accordingly, the remote unit 300 may receive the TDD carrier 600 and transmit it through an antenna. In addition, the main unit 100 may receive the uplink TDD carrier 700 corresponding to each of the different service channels from the remote unit 300, and convert the uplink TDD carrier 700 into the FDD carrier 800. . For example, the transceiver module 170 of the main unit 100 includes a first TDD carrier 710 corresponding to the first service channel data from the remote unit 300 and a second TDD carrier corresponding to the second service channel data. At 720, a third TDD carrier 730 corresponding to the third service channel data may be received and converted into one FDD carrier 800. Accordingly, the uplink FDD carrier 800 may include a plurality of uplink data such as first service channel data 810, second service channel data 820, and third service channel data 830.

Upon receiving the TDD carrier 600, the remote unit 300 may transmit in a direction corresponding to each service channel through a directional antenna or a sector antenna. In addition, the remote unit 300 may receive an uplink signal from a terminal in a direction corresponding to each service channel through a directional antenna or a sector antenna. This will be described with reference to FIG. 7.

7 is an exemplary diagram for signal output from a remote unit according to various embodiments of the present invention.

Referring to FIG. 7, the antenna 385 of the remote unit 300 is for a first sector 910, a second sector 920, and a third sector 930, which are a plurality of sectors in the service area 900. It may include a plurality of sector antennas capable of outputting signals. Here, the antenna 385 may be an antenna built into the remote unit 300 or may be an antenna connected through an external antenna port. In addition, the first sector 910 may be referred to as an alpha sector, the second sector 920 may be referred to as a beta sector, and the third sector 930 may be referred to as a gamma sector. The remote unit 300 may output a plurality of TDD carriers included in the received TDD carrier 600 through time switching. For example, the transceiver module 370 of the remote unit 300 transfers the first TDD carrier 610 corresponding to the first terminal 1010 to the first sector 910 by the RF module 380 through time transfer. And a second TDD carrier 620 corresponding to the second terminal 1020 to the second sector 920, and a third TDD carrier 630 corresponding to the third terminal 1030 to a third It can be output to the sector 930.

Accordingly, when transmitting the FDD carrier 500 through the antenna, the remote unit 300 transmits the TDD carrier 600 through the antenna, compared to transmitting with power that is the sum of the first service channel to the third service channel. , It is possible to transmit the appropriate power for each service channel, it is possible to reduce the power for the signal output of the remote unit 300.

The main unit 100 of the distributed antenna system 10 according to various embodiments may generate time division information when converting an FDD carrier to a TDD carrier, and transmit the generated time division information in the TDD carrier. Therefore, the remote unit 300 may output a service signal by switching the antenna based on the time division information included in the received TDD carrier. This will be described with reference to FIG. 8.

8 is an exemplary diagram for transmission of time division information according to various embodiments of the present invention.

Referring to FIG. 8, the main unit 100 may receive a downlink FDD carrier 500 including data 510, 520, and 530 for each of a first service channel to a third service channel. The main unit 100 may generate time division information based on at least one of a subscriber (terminal) corresponding to each of the data included in the received FDD carrier 500, an operator, and a cell design operation. For example, the channel scanner 180 of the main unit 100 acquires information corresponding to each of the data included in the received FDD carrier 500, and based on the obtained information, the transceiver module 170 Time division information can be created. The main unit 100 may convert the FDD carrier 500 into a TDD carrier 600. For example, the transceiver module 170 of the main unit 100 transfers service channel data included in the FDD carrier 500 to a first TDD carrier 610, a second TDD carrier 620, and a third TDD carrier. It can be converted to 630. In addition, the transceiver module 170 of the main unit 100 transmits the generated time division information 618, 628, 638 to the first TDD carrier 610, the second TDD carrier 620, and the third TDD carrier 630, respectively. Can be included in The remote unit 300 may transmit the received TDD carriers 610, 620, and 630 based on time division information included in each of the received TDD carriers. For example, the transceiver module 370 of the remote unit 300 outputs a first TDD carrier 610, a second TDD carrier 620, and a third TDD carrier 630 by switching antennas based on time division information. You can do it. In one embodiment, the RF module 380 of the remote unit 300 outputs the first TDD carrier 610 at a first time and a second TDD carrier 620 at a second time based on time division information. May be output, and the third TDD carrier 630 may be output at a third time. In this way, the main unit 100 generates time division information and transmits the generated time division information to the remote unit 300 when converting service channel data included in the downlink FDD carrier into a TDD carrier, and the remote unit 300 ) Can be switched to the antenna based on the time division information.

The above description is for illustrative purposes only, and the main unit 100 according to various embodiments of the present invention may perform communication service method conversion and time division information generation by configurations other than the described configuration.

The distributed antenna system 10 according to various embodiments can concentrate service on only the corresponding sector by controlling downlink signals not to time-division when there is a subscriber (terminal) in only one sector or when servicing only in one sector. . This will be described with reference to FIGS. 9 to 10.

9 is an exemplary diagram for a service for one sector of a remote unit according to various embodiments of the present invention.

10 is an exemplary diagram of service signal transmission corresponding to one sector according to various embodiments of the present invention.

Referring to FIG. 9, a first terminal 1010, a second terminal 1020, and a third terminal 1030 that are service targets are a second sector 920 that is one of the service areas 900 of the remote unit 300. ) Can only be placed. In the main unit 100, since the service target terminals 1010, 1020, and 1030 are located only in the second sector 920, a service signal is provided to the remote unit 300 so that the remote unit 300 operates only in the second sector 9290. Can be transmitted.

Referring to FIG. 10, the main unit 100 includes first service channel data 510, second service channel data 520, and third service channel data, which are a plurality of downlink data corresponding to each of a plurality of service channels. The FDD carrier 500 including the 530 may be received. Here, the first service channel data 510 is data corresponding to the first terminal 1010, the second service channel data 520 is data corresponding to the second terminal 1020, and the third service channel data 530 ) May be data corresponding to the third terminal 1030. If the main unit 100 determines that the data 510, 520, and 530 included in the received FDD carrier 500 are serviced only to the second sector 920, which is one service area of the remote unit 300, The received FDD carrier 500 may be transmitted to the remote unit 300 without converting it to a TDD carrier. Specifically, if the transceiver module 170 of the main unit 100 determines that the data 510, 520, 530 included in the received FDD carrier 500 are serviced only to the second sector 920 that is the same sector, The received FDD carrier 500 may be transmitted to the remote unit 300 without converting it to a TDD carrier according to time division. In one embodiment, the main unit 100 may generate time division information for data included in the received FDD carrier 500 or may not generate time division information. When the main unit 100 generates time division information, the main unit 100 may transmit the FDD carrier 600 including the generated time division information to the remote unit. Here, the FDD carrier 600 including time division information includes data 640, 650, 660 corresponding to the data 510, 520, 530 for each service channel included in the received FDD carrier 500. It may include, and may include the generated time division information 608. The remote unit 300 receives the transmitted FDD carrier 600 and transmits the received FDD carrier 600 to the first to third terminals 1010, 1020, and 1030 located in the second sector 920. I can. For example, the remote unit 300 may transmit service channel data 640, 650, and 660 to the first to third terminals 1010, 1020, and 1030 located in the second sector 920. .

The remote unit 300 according to various embodiments may focus a service only in a specific direction in one sector or in one sector by using the received service signal and time division information. This will be described with reference to FIG. 11.

11 is an exemplary diagram for service concentration in a specific direction of one sector according to various embodiments of the present disclosure.

Referring to FIG. 11, a first terminal 1010 corresponding to first service channel data, a second terminal 1020 corresponding to second service channel data, and a third terminal 1030 corresponding to third service channel data. May be located in the first sector 910, and may be located in the first direction, which is the same direction from the antenna 385 of the remote unit 300, even within the first sector 910. The remote unit 300 may output first to third service channel data included in the received service signal in the first direction of the first sector 910. Accordingly, the remote unit 300 can concentrate services not only in a specific sector but also in a specific direction. Here, the service signal received by the remote unit 300 may be an FDD carrier or a TDD carrier.

The remote unit 300 according to various embodiments of the present disclosure may output a service signal in each direction for each of a plurality of terminals located in different directions within one sector. This will be described with reference to FIGS. 12 to 13.

12 is an exemplary diagram of service signal transmission including time division information according to various embodiments of the present invention.

13 is an exemplary diagram for service signal transmission in different directions according to various embodiments of the present invention.

Referring to FIG. 12, the main unit 100 may convert a downlink signal, which is a received service signal, into a time-divided TDD carrier 600. The main unit 100 may include the time division information in the converted TDD carrier 600 and transmit it to the remote unit 300.

For example, the transceiver module 170 of the main unit 100 transmits the received downlink signal to a first TDD carrier 610 corresponding to the first terminal 1010 and a first TDD carrier 610 corresponding to the second terminal 1020. The 2 TDD carrier 620 may be converted into a third TDD carrier 630 corresponding to the third terminal 1030. In addition, the transceiver module 170 of the main unit 100 may include time division information 618, 628, and 638 for each service in the first to third TDD carriers 610, 620, and 630. . The remote unit 300 receives the first to third TDD carriers 610, 620, 630 including time division information 618, 628, 638 from the main unit 100, and receives time division information 618 , 628, 638), the first to third TDD carriers 610, 620, and 630 may be time-divided through the antenna 385. Also, when outputting, the remote unit 300 may output in a direction corresponding to a terminal receiving each service signal. This will be described with reference to FIG. 13.

13, the remote unit 300 time-divides the received first TDD carrier 610, the second TDD carrier 620, and the third TDD carrier 630, and sequentially through the antenna 385. Can be printed. When the remote unit 300 outputs each carrier using a directional antenna or a sector antenna, the remote unit 300 may output each carrier in a direction corresponding to a terminal receiving the carrier. For example, the remote unit 300 for each of the first terminal 1010, the second terminal 1020, and the third terminal 1030, which are located in the first sector 910, based on the time division information. , Signals according to the first TDD carrier 610, the second TDD carrier 620, and the third TDD carrier 630 may be output in the direction of each terminal. Specifically, based on the time division information included in the received TDD carrier, the remote unit 300 is sequentially positioned in the first sector 910, in a direction corresponding to the first terminal 1010, the first Outputs a service signal according to the TDD carrier 610, in a direction corresponding to the second terminal 1020, outputs a service signal according to the second TDD carrier 620, and a direction corresponding to the third terminal 1030 As a result, a service signal according to the third TDD carrier 630 may be output.

The distributed antenna system 10 according to various embodiments may output a subscriber detection allocation signal for detecting a subscriber (terminal). For example, when the main unit 100 provides a service only to a sector in which a subscriber is located in the entire service area of the remote unit 300, a subscriber detection to detect a sector subscriber (terminal) in a sector where the subscriber is not located. An allocation signal for use may be generated, and the generated allocation signal for subscriber detection may be transmitted to the remote unit 300 together with a downlink signal.

This will be described with reference to FIG. 14.

14 is an exemplary diagram for transmission of an allocation signal for subscriber detection according to various embodiments of the present invention.

Referring to FIG. 14, when a first terminal to a third terminal is located in a third sector that is the same sector of the remote unit 300, the main unit 100 transmits a service signal corresponding to the first terminal to the third terminal. It can be transmitted to the remote unit 300 as one signal. For example, the main unit 100 may transmit the FDD carriers 601 and 604 including service channel data corresponding to the first terminal to the third terminal to the remote unit 300. The main unit 100 may generate subscriber detection allocation signals 602, 603, 605, and 606 for detecting a subscriber (terminal) located in a sector other than the third sector in which the subscriber (terminal) is located. . For example, the main unit 100 includes the first subscriber detection allocation signals 602 and 605 which are subscriber detection allocation signals for detecting subscribers (terminals) in each of the first sector and the second sector other than the third sector. ) And the second subscriber detection allocation signals 603 and 606 may be generated. Here, the first subscriber detection allocation signals 602 and 605 are signals for detecting a subscriber in the first sector, and the second subscriber detection allocation signals 603 and 606 may be signals for detecting a subscriber in the second sector. have. The main unit 100 may allocate a subscriber detection allocation signal between the FDD carriers 601 and 604 and transmit the allocated signal to the remote unit 300. For example, a first subscriber detection allocation signal 602 and a second subscriber detection allocation signal 603 may be transmitted between the first FDD carrier 601 and the second FDD carrier 604.

The main unit 100 may include time division information in at least one of the FDD carriers 601 and 604 and the subscriber detection allocation signals 602, 603, 605 and 606 to transmit to the remote unit 300.

Meanwhile, the main unit 100 may change the time allocation for the corresponding sector when a data request according to the transmitted subscriber detection allocation signal is received. For example, the main unit 100 may change the time allocation for the first sector when a data request according to the transmitted first subscriber detection allocation signal 602 is received. For example, the main unit 100 may allocate a time to transmit the downlink signal for the first sector, convert the received downlink signal into time division, and transmit it at the allocated time.

The distributed antenna system 10 according to various embodiments may fixedly allocate emergency channels for emergency calls. For example, when transmitting a downlink signal, the main unit 100 may allocate an emergency channel for each carrier according to a service signal and transmit it to the remote unit 300. Here, the emergency call may refer to communication for contacting a designated telephone number or organization in case of an emergency, and thus may refer to various communication used in an emergency.

This will be described below.

15 is an exemplary diagram for emergency channel transmission according to various embodiments of the present invention.

Referring to FIG. 15, when transmitting a downlink signal, the main unit 100 allocates emergency channels for each of the first FDD carrier 607 and the second FDD carrier 608 according to the downlink signal, (608a, 608b) can be transmitted to the remote unit 300. Specifically, the main unit 100 allocates an emergency channel signal 608a according to the first FDD carrier 607, and allocates the emergency channel signal 608b according to the second FDD carrier 609, so that the remote unit ( 300). As described above, the distributed antenna system 10 according to various embodiments of the present invention allocates an emergency channel for an emergency call for each carrier, so that an emergency call connection is always possible in case of an emergency. In addition, the main unit 100 may adjust the assigned emergency channel when the number of emergency calls increases.

When receiving an FDD carrier including an emergency channel, the distributed antenna system 10 according to various embodiments may convert the received FDD carrier into a TDD carrier and transmit it to the remote unit 300. In addition, the distributed antenna system 10 may insert an emergency channel signal into a guard period between TDD carriers and transmit it to the remote unit 300. Here, the guard period may mean a period for preventing interference between different data in the TDD transmission scheme.

This will be described with reference to 16.

16 is an exemplary diagram for transmitting an emergency channel signal according to various embodiments of the present invention.

Referring to FIG. 16, the main unit 100 is an FDD that includes data 510, 520, 530 for each of a first service channel, a second service channel, and a third service channel, and data 540 for an emergency channel. The carrier 500 may be received. The main unit 100 may convert the received FDD carrier 500 into a TDD carrier 600, and insert the emergency channel data 540 into the guard period between the TDD carriers 610, 620, and 630. It can be transmitted to the remote unit 300. Specifically, the main unit 100 receives a first emergency channel signal 650 during a guard period between the first FDD carrier 610 corresponding to the first service channel and the second FDD carrier 620 corresponding to the second service channel. ) May be allocated, and a second emergency channel signal 660 may be allocated during a guard period between the second FDD carrier 620 and the third FDD carrier 630 corresponding to the third service channel. Here, the first emergency channel signal 650 and the second emergency channel signal 660 may be signals according to the same emergency channel or signals according to different emergency channels. During the uplink transmission, the remote unit 300 may transmit an uplink signal according to the terminal signal received from the terminals to the main unit 100 through the TDD carrier 700, and the emergency channel signal 750 according to the emergency call. The 760 may be inserted into the guard period between the TDD carriers 710, 720, and 730 and transmitted to the main unit 100. Specifically, the remote unit 300 is the first emergency channel signal 750 during a guard period between the first FDD carrier 710 corresponding to the first service channel and the second FDD carrier 720 corresponding to the second service channel. ) May be allocated, and a second emergency channel signal 760 may be allocated during a guard period between the second FDD carrier 720 and the third FDD carrier 730 corresponding to the third service channel. The main unit 100 may receive the TDD carrier 700, which is an uplink signal transmitted from the remote unit 300, and convert the received TDD carrier 700 into an FDD carrier 800. In addition, the main unit 100 may transmit the converted FDD carrier 800 to the base station. Here, the converted FDD carrier 800 may include data 810, 820, and 830 for each of the first service channel, the second service channel, and the third service channel, and data 840 for the emergency channel.

The main unit 100 and the remote unit 300 of the distributed antenna system 10 according to various embodiments may communicate by dividing one frequency band into an uplink and a downlink by time-dividing, and each uplink and Emergency signals can be assigned to the downlink area. This will be described with reference to FIGS. 17 to 18.

17 is an exemplary diagram of a frequency division method to which an emergency signal is fixedly allocated according to various embodiments of the present disclosure.

Referring to FIG. 17, the main unit 100 and the remote unit 300 time-divide each of the downlink and uplink signals by frequencies of two bands, and allocate an emergency signal to each of the downlink and uplink regions to downlink. Link signals and uplink signals can be exchanged. Accordingly, the main unit 100 and the remote unit 300 may simultaneously perform uplink transmission and downlink transmission.

18 is an exemplary diagram for a time division method in which an emergency signal is fixedly allocated according to various embodiments of the present disclosure.

Referring to FIG. 18, the main unit 100 and the remote unit 300 time-divide each of the downlink and uplink signals by one band frequency, and allocate an emergency signal to each of the downlink and uplink regions to downlink. Link signals and uplink signals can be exchanged. Accordingly, the main unit 100 and the remote unit 300 may sequentially perform uplink transmission and downlink transmission.

The main unit 100 of the distributed antenna system 10 according to various embodiments of the present invention can additionally allocate emergency resources for emergency channels according to the amount of emergency calls and demand, so when the number of emergency calls increases, emergency channel resources Emergency calls can be connected reliably by additionally allocating. In addition, the main unit 10 of the distributed antenna system 10 may allocate emergency channel resources according to the location of the terminal connecting the emergency call in the service area of the remote unit 300 and the sector in which the terminal is located.

In the above description, for ease of explanation, the main unit 100 of the distributed antenna system 10 converts the transmission method of the service signal. However, the hub unit 200 converts the service signal according to the system design and user selection. The transmission method may be changed, or emergency channel resources may be allocated. Accordingly, the hub unit 200 converts the FDD carrier transmitted from the main unit 100 into a TDD carrier and transmits it to the remote unit 300, and converts the TDD carrier transmitted from the remote unit 300 into an FDD carrier. It can also be transmitted to the main unit 100. In addition, the hub unit 200 may allocate emergency channel resources and transmit an emergency channel signal between service channels or during a guard period. Also, if necessary, the remote unit 300 of the distributed antenna system 10 may convert a service signal transmission method and allocate emergency channel resources.

As described above, the distributed antenna system of the present invention according to various embodiments may improve service signal output and expand a service area. In particular, the distributed antenna system of the present invention can efficiently provide a service signal using a time division duplex (TDD) or a frequency division duplex (FDD) according to the location and service area of a service target terminal. In addition, the distributed antenna system of the present invention can stably connect emergency phone connections by allocating emergency channel resources for emergency calls.

In the above, the technical idea of the present invention has been described in detail with reference to various embodiments, but the technical idea of the present invention is not limited to the above embodiments, and those of ordinary skill in the art within the scope of the technical idea of the present invention Various modifications and changes are possible by this.

1a~1n: BTS 10: distributed antenna system
30: POI 50: NMS
100: main unit 110: RF module
120: baseband module 150: backplane
170: transceiver module 171: FPGA
173: CPU 175: spectrum analysis module
180: channel scanner 190: power supply module
200: hub unit 270: transceiver module
290: power supply module 300: remote unit
370: transceiver module 380: RF module
385: antenna 500, 800: FDD carrier
600, 700: TDD carrier 900: service area
1010, 1020, 1030, 1040: terminal

Claims (15)

Receiving a frequency division duplex (FDD) carrier including data for each of a plurality of service channels of different frequency bands;
Converting each of a plurality of service channels included in the received FDD carrier into a plurality of Time Division Duplex (TDD) carriers; And
Including the step of transmitting the converted plurality of TDD carriers
Distributed antenna system service method.
The method of claim 1,
Converting into the plurality of TDD carriers
Generating time division information for each of the plurality of service channels; and
Including the step of inserting the generated time division information into each of the plurality of TDD carriers
Distributed antenna system service method.
The method of claim 1,
Converting into the plurality of TDD carriers
Determining a transmission sector in which each of a plurality of service channels included in the FDD carrier is to be transmitted,
And converting each of the plurality of service channels into the TDD carrier according to the determined transmission sector.
Distributed antenna system service method.
The method of claim 3,
According to the determined transmission sector, converting each of the plurality of service channels into the TDD carrier
And converting the plurality of identical service channels into the TDD carrier so that a plurality of service channels having the same determined transmission sector are included in one TDD carrier.
Distributed antenna system service method.
The method of claim 1,
After converting the plurality of TDD carriers,
Generating a subscriber detection assignment signal to which a subscriber detection channel for searching for a subscriber in a specific sector is allocated; And
Inserting the generated subscriber detection allocation signal between the converted plurality of TDD carriers, further comprising
Distributed antenna system service method.
The method of claim 5,
After the step of generating the subscriber detection allocation signal,
Receiving a data request according to the subscriber detection allocation signal; And
Allocating a time for transmitting the TDD carrier to the sector in which the data request was received, further comprising
Distributed antenna system service method.
The method of claim 1,
After converting the plurality of TDD carriers,
Further comprising the step of generating an emergency service channel signal for the emergency call,
Transmitting the converted plurality of TDD carriers
Transmitting the generated emergency service channel signal in a guard period between the converted plurality of TDD carriers.
Distributed antenna system service method.
In the main unit of the distributed antenna system,
At least one processor; And
A memory electrically connected to the at least one processor,
The memory, when the processor is executed,
Receiving a frequency division duplex (FDD) carrier including data for each of a plurality of service channels of different frequency bands from at least one base station,
Each of the plurality of service channels included in the received FDD carrier is converted into a plurality of TDD (Time Division Duplex) carriers,
Storing instructions for transmitting the converted plurality of TDD carriers to a remote unit
Main unit.
The method of claim 8,
The memory, when the processor is executed,
Generating time division information for each of the plurality of service channels,
Storing instructions for inserting the generated time division information into each of the plurality of TDD carriers
Main unit.
The method of claim 8,
The memory, when the processor is executed,
Determining a transmission sector in which each of a plurality of service channels included in the FDD carrier is to be transmitted,
Storing instructions for converting each of the plurality of service channels into the TDD carrier according to the determined transmission sector
Main unit.
The method of claim 10,
The memory, when the processor is executed,
Storing instructions for converting the same plurality of service channels into the TDD carrier so that a plurality of service channels having the same determined transmission sector are included in one TDD carrier.
Main unit.
The method of claim 8,
The memory, when the processor is executed,
Generates a subscriber detection assignment signal to which a subscriber detection channel is allocated to search for a subscriber in a specific sector,
Storing instructions for inserting the generated subscriber detection allocation signal between the generated plurality of TDD carriers
Main unit.
The method of claim 12,
The memory, when the processor is executed,
Receiving a data request according to the subscriber detection allocation signal,
Storing instructions for allocating a time for transmitting a TDD carrier for the sector in which the data request was received
Main unit.
The method of claim 8,
The memory, when the processor is executed,
Generate emergency service channel signals for emergency calls,
Storing instructions for transmitting the generated emergency service channel signal in a guard period between the converted plurality of TDD carriers
Main unit.
In the distributed antenna system comprising a main unit and at least one remote unit,
The main unit is
Receiving a frequency division duplex (FDD) carrier including data for each of a plurality of service channels of different frequency bands from at least one base station,
Each of the plurality of service channels included in the received FDD carrier is converted into a plurality of TDD (Time Division Duplex) carriers, and the converted plurality of TDD carriers are transmitted to the at least one remote unit,
The at least one remote unit
Time-dividing and outputting the plurality of TDD carriers transmitted from the main unit for at least one terminal in a service area
Distributed antenna system.

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