KR20060129766A - Distributed repeating module for trunked radio system - Google Patents

Abstract

A repeater distribution module for a trunked radio system is provided to receive an RF(Radio Frequency) signal from a base station of the trunked radio system by an antenna unit to convert the received signal into a digital signal, and to send the converted signal to a master unit through a low-priced transmission line, then to distribute the digital signal to plural remote units, thereby improving communication quality. One antenna unit(300) receives an RF signal from a base station to convert the received signal into a digital signal, and sends the digital signal to a master unit(400) through a transmission line. The one master unit(400) distributes the received digital signal to send the distributed digital signals to remote units(500) through transmission lines. The more than one of the remote units(500) converts the digital signals into analog signals, and sends the analog signals to a terminal through a power amplifier.

Description

Distributed repeating module for trunked radio system

1 is a diagram showing a connection of a general repeater.

2 is a view showing a change in coverage in the tunnel section when using a conventional repeater.

3 is a view showing a change in coverage in the tunnel section when using a repeater distribution module for a frequency common communication system according to the present invention.

Figure 4 is a block diagram showing the overall configuration of a repeater distribution module for a frequency common communication system according to the present invention.

5 is a block diagram showing an antenna unit of a repeater distribution module for a frequency common communication system according to the present invention;

6 is a block diagram showing a master unit of a repeater distribution module for a frequency common communication system according to the present invention;

7 is a block diagram showing a remote unit of a repeater distribution module for a frequency common communication system according to the present invention;

8 is a diagram illustrating spectrum mask characteristics of a channel filtering process of a repeater distribution module for a frequency common communication system according to the present invention;

9 is a diagram illustrating channel characteristics filtered by the process of FIG. 8.

10 to 12 are diagrams showing an installation example of a repeater distribution module for a frequency common communication system according to the present invention.

※ Explanation of code for main part of drawing

110. Base station coverage 120. Repeater coverage

130. Base Station 140. Repeater

141, 201.Link Antenna 142. Feed Cable

143. Service antenna 150. Terminal

160.Tunnel 202.UTP cable

203. First service antenna 203-1. 2nd service antenna

204. Modem antenna 300. Antenna unit

301, 506.Duplexers 302, 507.Low-Noise Amplifiers

303, 508. Down converter 304, 509. SAW filter

305, 510.A / D Converters 306, 502. Framers / Deframers

307, 501.UTP Transceivers 308, 503.D / A Converters

309, 504. Up converter 310, 505. Power amplifier

311.AU control unit 312, 408, 512. Power supply unit

400. Master unit 401. First UTP transceiver

402. First Framer / Deframer 403. Digital Filter

404. Second Framer / Deframer 404-1. 3rd framer / deframer

405. Second UTP Transceiver 405-1. 3rd UTP Transceiver

406.MU control unit 407. CDMA modem

409.Battery 500.Remote Unit

511.RU control part

      The present invention relates to a relay apparatus, and more particularly, in a repeater for receiving a high frequency signal from a base station of a frequency common communication system and retransmitting it to a shadow area, especially a tunnel and an underground space, receiving a high frequency signal from the base station and performing a digital signal. An antenna unit for converting the signal to a master unit through a transmission line and transmitting the digital signal received from the antenna unit to a remote unit through the transmission line, and from the master unit. The present invention relates to a repeater distribution module for a frequency common communication system including at least one remote unit converting a received digital signal into an analog signal and transmitting the same to a terminal through a power amplifier.

      In general, a repeater for a frequency common communication system has a simple relay function of receiving a high frequency signal from a base station, amplifying the signal, and then retransmitting the signal to a shaded area. The line loss of the cable connecting the link antenna and the relay period is large. Not only is the communication quality poor because noise is not removed, and there is a problem that the installation and rental costs are very expensive when using an optical fiber.

      1 is a diagram illustrating a connection of a general repeater. As shown, the frequency common communication system transmits from the base station to the terminal, i.e., the downlink frequency is 851.0125 to 855.9875 MHz, and transmits from the terminal to the base station, i.e., the uplink frequency is 806.0125 to 810.9875 MHz. In such a system, a repeater is used to maintain a service in a shadow area where a signal of a base station does not reach, for example, inside a tunnel or an underground space of a large building.

      That is, in FIG. 1, the base station 130 has a constant base station coverage 110, and the repeater 140 is installed in the shaded area to form the repeater coverage 120, thereby wirelessly communicating with the terminal 150 in the shaded area. You can send and receive messages.

      The present invention has been made to solve the above problems, the antenna unit receives a high frequency signal from the base station of the frequency common communication system by converting it into a digital signal and transmits to the master unit through a low-cost transmission line, the master flow path To distribute the digital signal to multiple remote units through low cost transmission line to improve communication quality and to provide repeater distribution module for frequency common communication system that can configure transmission line and system at low cost. Let it be technical problem.

      In order to solve the above technical problem, a repeater distributed module for a common frequency communication system according to the present invention includes a single antenna unit for receiving a high frequency signal from a base station, converting the signal into a digital signal, and transmitting the converted signal to a master unit through a transmission line ( 300); and one master unit 400 for distributing the digital signal received from the antenna unit and transmitting the digital signal to the remote units through a transmission line; and converting the digital signal received from the master unit into an analog signal, It is configured to include; at least one or more remote units (500) for transmitting to the terminal via.

      The antenna unit (AU) 300 includes: a link antenna 201 for receiving a downlink signal from the base station and transmitting an uplink signal to the base station; and a downlink signal from the link antenna and the link. A duplexer 301 which combines the uplink signal emitted through the antenna into one path; and a low noise amplifier 302 for low noise amplifying the downlink signal passing through the duplexer with a predetermined gain; and the output of the low noise amplifier. A down converter 303 for downconverting to an intermediate frequency; and a SAW filter 304 for filtering only a required band from the downconverted intermediate frequency signal; and an A / D converter for converting an output signal from the SAW filter into a digital signal. And reconfigure or restore the output of the A / D converter into a form suitable for transmission by the control signal from the AU control unit 311 to the D / A converter 308. Transmitting framer / deframer 306 and the output of the framer / deframer UTP transceiver 307 to convert the form to transmit or receive; Convert the output of the framer / deframer to an analog intermediate frequency signal A D / A converter 308; and an up converter 309 for up-converting the output signal from the D / A converter into a high frequency uplink signal; and amplifying the output of the up converter with a predetermined gain to transfer the output signal to the duplexer. A power amplifier (310); an AU control unit (311) for controlling the framer / deframer, the down converter, and the up converter by communicating with the UART communication scheme; and a power supply unit (312) for supplying power to the components; And a UTP cable 202 for transmitting the uplink / downlink signal and power of the UTP transceiver to a master unit which will be described later.

      The master unit (MU) 400 may include: a UTP cable 202 connected to an antenna unit for transmitting the uplink / downlink signal and power; and the master unit 400 connected to the antenna unit through the UTP cable. A first UTP transceiver 401 that converts the output of the first framer / deframer 402 into a form for transmission and transmits or receives it; and a reconstructing or restoring the input / output signal of the first UTP transceiver into a form suitable for transmission A framer / deframer 402 and a digital filter 403 for filtering only the required bands of the output of the first framer / deframer; and reconstructing the output of the digital filter into a form suitable for transmission to each remote unit. At least one framer / deframer 404, 404-1; and outputs of the framer / deframer 404, 404-1 in a form for transmission and / or reception One or more UTP transceivers 405 and 405-1 and UTP cables 202 for transmitting uplink / downlink signals and power of the UTP transceivers 405 and 405-1 to each remote unit described later. The MU controller 406 for controlling the framers / deframers 402, 404, 404-1 and communicating with a CDMA modem to be described later by communicating with the UART communication method. A CDMA modem 407 connected to the modem; a modem antenna 204 for transmitting and receiving data between the CDMA modem and a network management system (NMS); and a power supply unit 408 for supplying power to the components. ; And a battery 409.

      The remote unit (RU) 500 may include: a UTP cable 202 connected to a master unit for transmitting the uplink / downlink signal and power; and a framer connected to the master unit through the UTP cable. / UTP transceiver 501 for converting the output of the / de-framer 502 to a form for transmitting and transmitting or receiving; and a framer / de-framer 502 to reconstruct or restore the input and output signals of the UTP transceiver to a form suitable for transmission And a D / A converter (503) for converting the output of the framer / deframer into an analog intermediate frequency signal; and an up converter (504) for upconverting the output signal from the D / A converter into a high frequency uplink signal; And a power amplifier 505 that amplifies the output of the up converter with a predetermined gain and delivers the same to a duplexer to be described later. A duplexer 506 for combining a link signal and an uplink signal received through the first service antenna into one path; and a first service antenna for transmitting the downlink signal to a shadow area and receiving an uplink signal from a terminal. A low noise amplifier 507 for low noise amplifying the uplink signal passing through the duplexer with a predetermined gain; and a down converter 508 for down converting the output of the low noise amplifier to an intermediate frequency; The framer / deframer by communicating with a SAW filter 509 for filtering only a required band in an intermediate frequency signal; and an A / D converter 510 for converting an output signal from the SAW filter into a digital signal. A RU controller 511 for controlling the up converter and the down converter; And a power supply unit 512 for supplying power to the components.

      Hereinafter, a preferred embodiment of a repeater distribution module for a frequency common communication system according to the present invention will be described in detail with reference to the drawings. In the following description, the same or corresponding members will be denoted by the same reference numerals and detailed description thereof will be omitted.

      2 and 3 are diagrams illustrating a change in coverage in a tunnel section when using a conventional repeater and a tunnel section when using a repeater distribution module for a frequency common communication system according to the present invention.

      First, in FIG. 2, a conventional repeater receives a downlink high frequency signal from a base station by a link antenna 141 and uses a power feeding cable 142 of a predetermined length (d in FIG. 2), for example, a coaxial cable or an optical path. It is connected to the repeater 140 installed in. The repeater transmits and receives a downlink signal from the base station and an uplink signal from a terminal in the tunnel by the service antenna 143. At this time, the coverage that can be serviced by the repeater is a long period of the tunnel, a certain period (D in Figure 2) occurs that the service does not occur, if the length of the feed cable 142 is increased to solve this problem Another problem occurs that the amount of attenuation of the signal (d + D in FIG. 2) is larger and the line cost is increased.

      On the contrary, in FIG. 3, the repeater distribution module according to the present invention receives the downlink high frequency signal from the base station by the link antenna 201 and converts it into a digital signal in the antenna unit 300 connected thereto. The master unit distributes the digital signal received from the antenna unit and transmits the digital signal to the remote units 500 through the UTP cable 202, and at least one remote unit is provided. The digital signal received from the master unit is converted into an analog signal and then transmitted to the terminal through the service antennas 203 and 203-1. In addition, the uplink signal from the terminal is made up of the reverse path.

      Therefore, the coverage that the repeater distribution module can service is extended by using a remote unit when the length of the tunnel is long, so that the service is smoothly performed, and digital signals are transmitted between the antenna unit and the master unit, and between the master unit and the remote unit. There is no deterioration in communication quality as it is transmitted, and since the low cost UTP cable is used even in the connection between the units, the line cost is greatly reduced.

      Figure 4 is a block diagram showing the overall configuration of the repeater distribution module for a frequency common communication system according to the present invention, as described above by receiving a high-frequency signal from the base station by the link antenna 201 UTP cable after converting it into a digital signal One antenna unit 300 for transmitting to the master unit through 202, and the digital signal received from the antenna unit is filtered and distributed to transmit to the remote units via the UTP cable 202 and using a CDMA modem One master unit 400 which transmits the status of each remote unit to the operator server, and converts and amplifies the digital signal received from the master unit to an analog signal to the terminal through the service antennas 203 and 203-1. It consists of at least one or more remote units 500 for transmitting.

      5 is a block diagram showing an antenna unit of a repeater distribution module for a frequency common communication system according to the present invention, a link antenna 201 for receiving a downlink signal from a base station and transmitting an uplink signal to the base station, and the link. A duplexer 301 for combining the downlink signal from the antenna and the uplink signal emitted through the link antenna into one path, and a low noise amplifier 302 for low noise amplifying the downlink signal passing through the duplexer with a predetermined gain. And a down converter 303 for down-converting the output of the low noise amplifier to an intermediate frequency, an SAW filter 304 for filtering only a required band from the down-converted intermediate frequency signal, and a digital output signal from the SAW filter. The output of the A / D converter by the A / D converter 305 for converting the signal into a signal and a control signal from the AU control unit 311. Framer / Deframer 306 to reconfigure, restore and send to D / A converter 308 in a form suitable for transmission, and UTP transceiver that converts and transmits or receives the framer / deframer's output in a form for transmission. 307, a D / A converter 308 for converting the output of the framer / deframer into an analog intermediate frequency signal, and an up converter for upconverting the output signal from the D / A converter into a high frequency uplink signal ( 309, an AU control unit for controlling the framer / deframer, down converter and up converter by communicating with the power amplifier 310 which amplifies the output of the up converter to a predetermined gain and transmits it to the duplexer, by a UART communication method. 311, a power supply unit 312 for supplying power to the components, and an uplink / downlink signal and power of the UTP transceiver to a master unit described later. Consists of a UTP cable 202.

      6 is a block diagram showing a master unit of a repeater distribution module for a frequency common communication system according to the present invention, the UTP cable 202 connected to an antenna unit for transmitting the uplink / downlink signal and power, and A first UTP transceiver 401 which is connected to the antenna unit via a UTP cable, converts the output of the first framer / deframer 402 into a form for transmission, and transmits or receives the input / output signal of the first UTP transceiver; A first framer / deframer 402 for reconstructing or restoring to a form suitable for transmission, a digital filter 403 for filtering only a required band of the output of the first framer / deframer, and receiving the output of the digital filter. At least one framer / deframer 404, 404-1 for reconstructing a form suitable for transmission to a remote unit, and the framer / deframer At least one UTP transceivers 405, 405-1 and uplinks of the UTP transceivers 405, 405-1 that converts the output of 404, 404-1 into a form for transmission and transmits or receives them. The framer / deframers 402, 404 and 404-1 are controlled by communicating with the UTP cables 202 for transmitting downlink signals and power to each remote unit to be described later by the UART communication method. An MU controller 406 communicating with a CDMA modem, a CDMA modem 407 connected with the MU controller in a UART communication scheme, and a CDMA modem and a network management system (NMS). And a modem antenna 204, a power supply 408 and a battery 409 for supplying power to the components.

      7 is a block diagram showing a remote unit of a repeater distribution module for a frequency common communication system according to the present invention, the UTP cable 202 connected to a master unit for transmitting the uplink / downlink signal and power, and A UTP transceiver 501 connected to the master unit via a UTP cable to convert the output of the framer / deframer 502 into a form for transmitting and receiving or reconstructing the input / output signal of the UTP transceiver into a form suitable for transmission. A framer / deframer 502 for reconstructing or restoring, a D / A converter 503 for converting the framer / deframer's output to an analog intermediate frequency signal, and an output signal from the D / A converter for a high frequency uplink signal. An up converter 504 for up-converting the power to an up converter, and a power to amplify the output of the up converter with a predetermined gain and transfer the same to a duplexer which will be described later. A duplexer 506 which combines the aeration 505, the downlink signal sent out through the first service antenna 203 to be described later, and the uplink signal received through the first service antenna in one path, and the downlink A first service antenna 203 for transmitting a link signal in a shaded area and receiving an uplink signal from a terminal, a low noise amplifier 507 for low noise amplifying the uplink signal passing through the duplexer with a predetermined gain, and the low noise amplifier A down converter 508 for down-converting the output of the signal to an intermediate frequency, a SAW filter 509 for filtering only a required band from the down-converted intermediate frequency signal, and A for converting the output signal from the SAW filter into a digital signal. An RU control unit 511 for controlling the framer / deframer, up-converter, and down-converter by communicating with the / D converter 510 by the UART communication method and the phrase. It is composed of a power supply unit 512 for supplying power to the components.

      In addition, the repeater distribution module for a frequency common communication system according to the present invention, as can be seen in Figures 5 to 7 in the embodiment of the present invention inexpensive UTP between the antenna unit and the master unit, between the master unit and remote units Although a method of connecting with the cable 202 has been disclosed, the present invention is not limited thereto, and various lines such as a high frequency coaxial cable or an optical line may be used, and the subway history of FIG. When installed in a distributed manner using a plurality of remote units in the same large building, a wired telephone line or a CATV public hearing network using VDSL communication may be used.

      8 is a diagram illustrating spectrum mask characteristics of a channel filtering process of a repeater distribution module for a frequency common communication system according to the present invention. 8 (a) shows a signal spectrum of an A / D converter input terminal, in which signals F1 and F2 of two desired channels are input together with other signals. FIG. 8 (b) shows the spectrum of the signal digitally converted by the A / D converter, and the portion indicated by the oblique line at the bottom exceeds the dynamic range of the A / D converter and is buried below the noise level of the A / D converter. Indicates deterioration. FIG. 8 (c) shows the spectrum of the signal converted to I / Q through the digital down converter, and FIG. 8 (d) shows the spectrum of the final signal passed through the digital down converter, in which two digital down converters each have only a corresponding signal. After down converting and down converting, only the corresponding signal is selected through a low pass filter. The portion indicated by the dotted line in FIG. 8 (c) shows the filtering characteristics of the LPF.

      Next, FIG. 8E shows a restoration process of the mask characteristic by the digital filter. The digital filter restores the mask characteristic using a FIR filter having a very high selectivity. In this case, as the dynamic range increases, the bit resolution increases. The dotted line indicates the filtering characteristic of the LPF, and FIG. 8 (f) shows the spectrum of the I / Q signal in which the mask characteristic is restored by the above process. Finally, FIG. 8 (g) is a spectrum of signals that are up converted through the digital up converter, in which two digital up converters upconvert each signal to a corresponding frequency, and this signal is analogized by the D / A converter. Is converted into a signal.

      FIG. 9 is a diagram illustrating channel characteristics filtered by the process of FIG. 8, wherein (a) illustrates a case where a repeater distribution module according to the present invention is used and (b) illustrates a case where a repeater according to the prior art is used. As shown in FIG. 9 (a), the repeater distribution module according to the present invention has a filter characteristic of passing only a channel bandwidth of 25 kHz, while the repeater according to the prior art as shown in FIG. 9 (b) passes through a full band of 200 kHz. Since the key has a filter characteristic, it is impossible to cancel an interference signal included in the band.

      10 to 12 are diagrams showing an installation example of a repeater distribution module for a frequency common communication system according to the present invention, and each shows a tunnel, subway station, RF or optical relay system. In FIG. 10, when the repeater distribution module of the present invention is installed in a tunnel, an antenna unit outside the tunnel and a master unit at the tunnel entrance are connected, and at least one remote unit is connected to the master unit inside the tunnel.

      11 is a case where the repeater distribution module of the present invention is installed in a subway station, the antenna unit of the ground and the master unit of the basement 1 floor communication room are connected, and at least one remote unit is located on the basement 1 floor and the basement 2 floor. The master unit is connected. In addition, Figure 12 shows the connection and installation structure of the repeater distribution module according to the present invention. In FIG. 12A, the repeater distribution module of the present invention shows a case where an antenna unit, a master unit, and a remote unit are installed adjacent to each other, and another remote unit is installed at a remote location. 12 (b) shows a case in which a light path is connected instead of a UTP cable, in which case the distance can be extended up to 20 km.

      As described above, the present invention has been described and illustrated with respect to the preferred embodiments, but the present invention is not limited to the above-described embodiments, and those of ordinary skill in the art to which the present invention pertains described in the claims Various changes and modifications can be made without departing from the spirit.

      As described above, the present invention receives a high frequency signal from a base station of a frequency common communication system by an antenna unit, converts it into a digital signal, transmits it to a master unit through a low-cost transmission line, and distributes the digital signal from the master oil. Therefore, by transmitting to a plurality of remote units through a low-cost transmission line, not only can the communication quality be improved, but also the transmission line and the system can be configured at low cost.

Claims (6)

In the apparatus for receiving a high frequency signal from the base station of the common frequency communication system and relaying it, An antenna unit which receives the high frequency signal from the base station, converts the signal into a digital signal, and transmits the converted signal to a master unit through a transmission line; A master unit for distributing the digital signal received from the antenna unit and transmitting the digital signal to the remote units through a transmission line; And And at least one remote unit for converting the digital signal received from the master unit into an analog signal and transmitting the digital signal to the terminal through a power amplifier. The method of claim 1, wherein the antenna unit, A link antenna for receiving a downlink signal from the base station and transmitting an uplink signal to the base station; A duplexer that combines a downlink signal from the link antenna and an uplink signal emitted through the link antenna into one path; A low noise amplifier for low noise amplifying a downlink signal passing through the duplexer with a predetermined gain; A down converter for down converting the output of the low noise amplifier to an intermediate frequency; An SAW filter for filtering only a required band from the down-converted intermediate frequency signal; An A / D converter for converting an output signal from the SAW filter into a digital signal; A framer / deframer for reconfiguring or restoring the output of the A / D converter to a form suitable for transmission by a control signal from an AU controller; A UTP transceiver converting the framer / deframer output into a form for transmitting and transmitting or receiving the frame; A D / A converter for converting the output of the framer / deframer into an analog intermediate frequency signal; An up converter for upconverting the output signal from the D / A converter into a high frequency uplink signal; A power amplifier for amplifying the output of the up converter with a predetermined gain and transferring it to the duplexer; An AU control unit controlling the framer / deframer, the down converter and the up converter by communicating by a UART communication scheme; A power supply unit supplying power to the components; And And a UTP cable for transmitting the uplink / downlink signal and power of the UTP transceiver to a master unit which will be described later. The method of claim 1, wherein the master unit, A UTP cable connected with the antenna unit to transmit the uplink / downlink signal and power; A first UTP transceiver connected to the antenna unit via the UTP cable to convert the output of the first framer / deframer into a form for transmitting and transmitting or receiving the first frame; A first framer / deframer for reconstructing or restoring the input / output signal of the first UTP transceiver into a form suitable for transmission; A digital filter for filtering only a required band of the output of the first framer / deframer; At least one framer / deframer for receiving the output of the digital filter and reconstructing the remote unit into a form suitable for transmission; At least one UTP transceiver for converting and transmitting or receiving the output of the framer / deframer; UTP cables for transmitting uplink / downlink signals and power of the UTP transceivers to each remote unit described later; An MU control unit for controlling the framer / deframers by communicating by a UART communication scheme and communicating with a CDMA modem to be described later; A CDMA modem connected to the MU control unit in a UART communication manner; A modem antenna for transmitting and receiving data between the CDMA modem and a network management system; A power supply unit supplying power to the components; And a battery; repeater distribution module for a frequency common communication system, characterized in that consisting of. The method of claim 1, wherein the remote unit, A UTP cable connected with a master unit to transmit the uplink / downlink signal and power; A UTP transceiver connected to a master unit via the UTP cable to convert a framer / deframer's output into a form for transmission or transmission; A framer / deframer for reconstructing or restoring the input / output signal of the UTP transceiver into a form suitable for transmission; A D / A converter for converting the output of the framer / deframer into an analog intermediate frequency signal; An up converter for upconverting the output signal from the D / A converter into a high frequency uplink signal; A power amplifier for amplifying the output of the up converter with a predetermined gain and transferring it to a duplexer described later; A duplexer which combines the downlink signal emitted through the first service antenna and the uplink signal received through the first service antenna into one path; A first service antenna for transmitting the downlink signal in a shaded area and receiving an uplink signal from a terminal; A low noise amplifier for low noise amplifying the uplink signal passing through the duplexer with a predetermined gain; A down converter for down converting the output of the low noise amplifier to an intermediate frequency; An SAW filter for filtering only a required band from the down-converted intermediate frequency signal; An A / D converter for converting an output signal from the SAW filter into a digital signal; A RU controller for controlling the framer / deframer, up converter, and down converter by communicating by a UART communication scheme; And Repeater distribution module for a frequency common communication system, characterized in that consisting of; a power supply for supplying power to the components. The method according to any one of claims 1 to 4, The connection between the antenna unit and the master unit and the connection between the master unit and the remote unit are any one of a wired transmission line group consisting of a UTP cable, a high frequency coaxial cable, an optical line, a wire telephone line, and a CATV public hearing network. Repeater distribution module for public communication systems. The master unit of claim 1, wherein the master unit comprises: A CDMA modem and a modem antenna are provided therein, and the CDMA modem is connected to the MU control unit in a UART communication manner, and transmits and receives data between the CDMA modem and the network management system by the modem antenna. Repeater Distribution Module.

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