KR20110039682A - Digital transmission repeater and method for transmission at the same - Google Patents

Abstract

PURPOSE: A digital transmission repeater and a method for transmission at the same are provided to reduce the bandwidth requested for transmission. CONSTITUTION: A donor unit(310) demodulates a downstream signal received form a base station into digital downstream data, and transfers the data to a remote unit(330). The donor unit modulates the digital upstream data received from the remote unit into an upstream signal, and transfers the signal to the base station, The remote unit modulates the digital downstream data into a downstream signal.

Description

Digital transmission repeater and transmission method in digital transmission repeater {DIGITAL TRANSMISSION REPEATER AND METHOD FOR TRANSMISSION AT THE SAME}

The present invention relates to a transmission method in a digital transmission repeater and a digital transmission repeater, and more particularly, to a transmission method in a digital transmission repeater and a digital transmission repeater to reduce the bandwidth required for transmission and to increase the transmission efficiency.

In constructing a mobile communication network, a base station is disposed at an optimal place of each cell in consideration of economical efficiency, etc., but a large number of shaded areas which cannot reach a signal due to obstacles such as large buildings, hills, underground, and mountainous regions are generated. Accordingly, in the mobile communication system, a repeater is installed and used to expand a service area of a base station or to eliminate a shadow area.

Such a repeater includes an optical repeater or an in-building repeater, and the optical repeater or in-building repeater includes a donor unit connected to a base station and a remote unit connected to a terminal, and the donor unit and the remote unit may be connected by a wired line. A repeater including such a donor unit and a remote unit and connected to the unit by a wired line may be referred to as a transmission repeater.

Such transmission repeaters can be divided into analog transmission repeaters and digital transmission repeaters according to the characteristics of the transmission signal. Recently, the use of digital transmission repeaters is increasing.

1 illustrates an example of extending a service area of a base station using a transmission repeater in a conventional mobile communication system. As shown in FIG. 1, the base station 101 provides a service within a predetermined cell area, and also enables communication with the terminal 120 in a shaded area through the repeater 110. In the following, the downlink signal 130 refers to the signal from the base station to the terminal, and the uplink signal 140 refers to the signal from the terminal to the base station. The conventional transmission repeater 110 receives the downlink signal 130 from the base station 101, the donor unit 111 for transmitting the uplink signal 140 to the base station 101, and the downlink signal 130 to the terminal ( And a remote unit 112 that transmits to the terminal 120 and receives an uplink signal 140 from the terminal 120, and the donor unit 111 and the remote unit 112 may be connected by a wired line. The terminal 120 here may be a cellular telephone, a handset, a personal digital assistant (PDA), or the like.

2 schematically illustrates a conventional digital transmission repeater 200. The conventional digital transmission repeater 200 largely includes a donor unit 210 and a remote unit 220.

The donor unit 210 receives the downlink signal from the base station, the donor antenna 211 for transmitting the uplink signal to the base station, the downconversion unit 213 for converting the received high frequency downlink signal into the low frequency downlink signal, and the converted low frequency downlink A digital converter 214 for converting a signal into a digital downlink signal, a transceiver 215 for transmitting the converted digital downlink signal to the remote unit 220, and receiving a digital uplink signal from the remote unit 220, a transceiver unit An analog converter 216 for converting the digital uplink signal received at 215 into an analog uplink signal, an upconverter 217 for converting the converted analog uplink signal to a high frequency uplink signal, and a donor antenna 211 An antenna common 212 for separating the down and up signals.

In addition, the remote unit 220 receives the uplink signal from the terminal, the remote antenna 221 for transmitting the downlink signal to the terminal, the downconversion unit 223 for converting the received high frequency uplink signal to a low frequency uplink signal, the converted A digital converter 224 for converting a low frequency uplink signal into a digital uplink signal, a transmitter / receiver 225 for transmitting the converted digital uplink signal to the donor unit 210 and receiving a digital downlink signal from the donor unit 210, An analog converter 226 for converting the digital downlink signal received from the transceiver 225 into an analog downlink signal, an upconverter 227 for converting the converted analog downlink signal to a high frequency downlink signal, and a remote antenna 221; And an antenna common 222 connected to separate the down and up signals.

In general, a mobile communication system modulates transmission data to improve transmission quality. In this process, the bandwidth of the transmission signal is extended. In the conventional digital transmission repeater, since a signal with an extended bandwidth is simply digitally converted and transmitted during a modulation process, a high bandwidth transmission line is required between the donor unit and the remote unit, and an expensive line such as an optical line is required for this purpose. There is a problem with using.

An object of the present invention is to solve the above problems, and by demodulating and transmitting a digitally converted signal into digital data, it is possible to provide an effect of reducing the bandwidth required for transmission and improving transmission efficiency.

In order to achieve the above object, the digital transmission repeater according to the embodiment of the present invention is characterized by including a donor unit and a remote unit. The donor unit may be configured to demodulate the downlink signal received from the base station into digital downlink data and transmit the demodulated downlink signal to the remote unit, and modulate the digital uplink data received from the remote unit into an uplink signal. The remote unit is configured to demodulate the uplink signal received from the terminal into digital uplink data and transmit it to the donor unit, and modulate the downlink signal received from the donor unit into a downlink signal and transmit the downlink signal to the base station.

A digital transmission repeater according to another embodiment of the present invention includes a donor unit and a remote unit. The donor unit includes: a first down converter for converting a high frequency downlink signal received from a base station into a low frequency downlink signal; a first digital converter for converting a low frequency downlink signal converted by the first downconverter into a digital downlink signal; A first digital demodulator for demodulating the digital downlink signal converted by the digital converter into digital downlink data, and a digital downlink data demodulated by the first digital demodulator to a remote unit; A first transceiver for receiving, a first digital modulator for modulating the digital uplink data received by the first transceiver, and a digital uplink signal, a first digital modulator for converting the digital uplink signal modulated by the first digital modulator into an analog uplink signal A high frequency uplink of the analog uplink signal converted by the analog converter and the first analog converter And a first up converter for converting the signal into a signal. The remote unit includes a second down converter for converting a high frequency uplink signal received from a terminal into a low frequency uplink signal, a second digital converter for converting a low frequency uplink signal converted by the second downconverter into a digital uplink signal, and a second A second digital demodulator that demodulates the digital upstream signal converted by the digital converter into digital uplink data, and transmits the digital upstream data demodulated by the second digital demodulator to the donor unit and receives the digital downlink data from the donor unit. A second digital modulator for modulating the digital downlink data received by the second transceiver, a digital downlink signal received by the second transceiver, and a second analog for converting the digital downlink signal modulated by the second digital modulator into an analog downlink signal Converts the analog downlink signal converted by the converter and the second analog converter into a high frequency downlink signal. It characterized in that it includes a second up-conversion to convert.

In a digital transmission repeater according to another embodiment of the present invention, a donor unit is connected to a donor antenna and a donor antenna for receiving a downlink signal from a base station and transmitting an uplink signal to the base station, and separating the downlink signal and the uplink signal. The antenna unit further comprises an antenna, wherein the remote unit is connected to a remote antenna and a remote antenna for receiving the uplink signal from the terminal, and transmits the downlink signal to the terminal and the second antenna common to separate the downlink signal and the uplink signal It further comprises.

The digital transmit repeater according to another embodiment of the present invention is characterized in that the donor unit further comprises a first receiving antenna for receiving the downlink signal from the base station and a first transmitting antenna for transmitting the uplink signal to the base station. The unit further comprises a second receiving antenna for receiving the uplink signal from the terminal and a second transmitting antenna for transmitting the downlink signal to the terminal.

A digital transmission repeater according to still another embodiment of the present invention is characterized in that the donor unit is wired to the base station. In this embodiment, the remote unit may further include a second receiving antenna for receiving the uplink signal from the terminal and a second transmitting antenna for transmitting the downlink signal to the terminal, wherein the remote unit receives the uplink signal from the terminal. The apparatus may further include a remote antenna for receiving and transmitting a downlink signal to the terminal, and a second antenna common connected to the remote antenna to separate the downlink signal and the uplink signal.

In a digital transmission repeater according to still another embodiment of the present invention, a donor unit is connected to a plurality of remote units, and the first and second transceivers are configured to enable connection between the donor unit and the plurality of remote units. .

In the digital transmission repeater according to another embodiment of the present invention, the donor unit is configured to be cascaded with a plurality of remote units, and the first and second transceivers are configured to allow a stepped connection between the donor unit and the plurality of remote units. It features.

The digital transmission repeater according to another embodiment of the present invention further includes a distribution unit for processing data transmission and reception between one donor unit and the plurality of remote units, wherein the donor unit is connected to the plurality of distribution units, The distribution unit is characterized in that it is connected with a plurality of remote units.

In order to achieve the above object, a transmission method in a digital transmission repeater according to an embodiment of the present invention, the high frequency downlink signal received from the base station to the donor unit is converted into a high frequency downlink signal for transmission from the remote unit to the terminal And converting the high frequency uplink signal received from the terminal to the remote unit into a high frequency uplink signal for transmission from the donor unit to the base station. The step of converting the high frequency downlink signal received from the base station to the donor unit into a high frequency downlink signal for transmission from the remote unit to the terminal may include converting the high frequency downlink signal received from the base station to the donor unit as a low frequency downlink signal using a first downconversion unit. Converting, converting a low frequency downlink signal into a digital downlink signal using a first digital converter; demodulating the digital downlink signal into digital downlink data using a first digital demodulator; and digitally downlinking using a first transceiver Transmitting the data to the remote unit, receiving the digital downlink data at the remote unit using the second transceiver, modulating the received digital downlink data into the digital downlink signal using the second digital modulator, and the second analog Digital Down Signal Using Converter Characterized in that it comprises a step of converting the analog downlink signal to a radio frequency downlink signal using phase portion and a second up-converted to down-converted to an analog signal. The step of converting the high frequency uplink signal received from the terminal to the remote unit into a high frequency uplink signal for transmission from the donor unit to the base station comprises: converting the high frequency uplink signal received from the terminal into the low frequency uplink signal using the second down converter; Converting, converting a low frequency uplink signal into a digital uplink signal using a second digital converter; demodulating the digital uplink signal into digital uplink data using a second digital demodulator; digital uplinking using a second transceiver Transmitting data to the donor unit, receiving digital upstream data at the donor unit using a first transceiver, modulating the received digital upstream data using a first digital modulator, to a digital uplink signal, and first analog Use the converter to know the digital upstream signal And converting the analog uplink signal into a high frequency uplink signal using the first upconversion unit.

In a transmission method in a digital transmission repeater according to another embodiment of the present invention, the donor antenna is converted before the step of converting a high frequency downlink signal received from a base station to a donor unit into a high frequency downlink signal for transmission from a remote unit to a terminal. Receiving the downlink signal from the base station by using the signal; and converting the high frequency downlink signal received from the base station to the donor unit into a high frequency downlink signal for transmission from the remote unit to the terminal. Prior to transmitting, converting the high frequency uplink signal received from the terminal to the remote station into a high frequency uplink signal for transmission from the donor unit to the known station, and receiving the uplink signal from the terminal using the remote antenna and from the terminal. Received on the remote unit After converting the frequency uplink signal to a high frequency uplink signal for transmission from the donor unit to the base station, the method further comprises transmitting an uplink signal to the base station using a donor antenna, wherein the first antenna common connected to the donor antenna And configured to separate the down signal and the up signal, and the second antenna common connected to the remote antenna is configured to separate the down signal and the up signal.

A transmission method in a digital transmission repeater according to still another embodiment of the present invention includes a first reception before converting a high frequency downlink signal received from a base station to a donor unit into a high frequency downlink signal for transmission from a remote unit to a terminal. Receiving a downlink signal from a base station using an antenna, and converting a high frequency downlink signal received from a base station to a donor unit into a high frequency downlink signal for transmission from a remote unit to a terminal. Receiving an uplink signal from the terminal using a second receiving antenna before transmitting the downlink signal to the radio frequency unit and converting the high frequency uplink signal received from the terminal to the high frequency uplink signal for transmission from the donor unit to the base station. And from the terminal to the remote unit Placed it characterized in that it comprises the step of transmitting an up signal and a subsequent step of converting to a radio frequency uplink signal for transmitting the radio frequency uplink signal to the base station on the donor unit, a base station using a first transmission antenna further.

In the transmission method in the digital transmission repeater according to another embodiment of the present invention, before the step of converting the high frequency downlink signal received from the base station to the donor unit to a high frequency downlink signal for transmission from the remote unit to the terminal, the donor unit is The donor unit is wired to the base station after the wired connection with the base station to receive the downlink signal and the conversion of the high frequency uplink signal received from the terminal to the remote unit into a high frequency uplink signal for transmission from the donor unit to the base station. And further comprising transmitting an uplink signal.

In a transmission method in a digital transmission repeater according to another embodiment of the present invention, a donor unit is connected to a plurality of remote units, and the first and second transceivers are configured to enable a connection between the donor unit and the plurality of remote units. It is characterized by.

In a transmission method in a digital transmission repeater according to still another embodiment of the present invention, a donor unit is cascaded with a plurality of remote units, and the first and second transceivers are cascaded between the donor unit and a plurality of remote units. It is characterized in that configured to.

A transmission method in a digital transmission repeater according to another embodiment of the present invention further comprises the step of processing data transmission and reception between a donor unit and a plurality of remote units by using a distribution unit. Is connected to the plurality of distribution units, and the distribution unit is connected to the plurality of remote units.

As described above, the present invention solves the problems of the prior art, and by demodulating the digitally converted signal into digital data and transmitting it by reducing the data size, it is possible to reduce the bandwidth required for transmission and increase the transmission efficiency Acquire it.

Hereinafter, embodiments according to the present invention will be described with reference to the drawings.

3A illustrates a configuration of a digital transmission repeater 300 according to an embodiment of the present invention. The digital transmit repeater 300 may include a donor unit 310 and a remote unit 330.

The donor unit 310 receives a downlink signal from a base station, a donor antenna 311 for transmitting an uplink signal to the base station, a downconversion unit 313 for converting the received high frequency downlink signal into a low frequency downlink signal, and a converted low frequency downlink A digital converter 314 for converting the signal into a digital downlink signal, a digital demodulator 315 for demodulating the converted digital downlink signal into digital downlink data, and transmitting the demodulated digital downlink data to the remote unit 330, Transmitter and receiver 316 for receiving digital upstream data from unit 330, digital modulator 317 for modulating digital upstream data received at transceiver 316 to create a digital uplink signal, and modulating the digital uplink signal. An analog converter 318 for converting the uplink signal, an upconverter 319 for converting the converted analog uplink signal into a high frequency uplink signal. Is connected to the donor antenna 311 may be of a duplexer 312 that separates the downlink signal and an uplink signal.

In addition, the remote unit 330 receives the uplink signal from the terminal, the remote antenna 331 for transmitting the downlink signal to the terminal, the downconversion unit 333 for converting the received high frequency uplink signal to a low frequency uplink signal, conversion A digital converter 334 for converting the low frequency uplink signal into a digital uplink signal, a digital demodulator 335 for demodulating the converted digital uplink signal into digital uplink data, and transmitting the demodulated digital uplink data to the donor unit 310. And a digital modulator 337 for receiving the digital downlink data from the donor unit 310, a digital downlink modulator 337 for modulating the digital downlink data received at the transceiver 336 to generate a digital downlink signal, and a modulated digital downlink. An analog converter 338 for converting a signal into an analog downlink signal, and an upconverter 339 for converting the converted analog downlink signal into a high frequency downlink signal And an antenna common unit 332 connected to the remote antenna 331 to separate the downlink signal and the uplink signal.

3B illustrates a configuration of a digital transmission repeater 300 'according to another embodiment of the present invention. The donor unit 310 in the digital transmit repeater 300 'of FIG. 3B replaces the donor antenna 311 and the antenna common 312 in the digital transmit repeater 300 of FIG. It may be composed of a receiving antenna 321 for receiving and a transmitting antenna 322 for transmitting an uplink signal to the base station. In addition, the remote unit 330 in the digital transmission repeater 300 'of FIG. 3B replaces the remote antenna 331 and the antenna common unit 332 in the digital transmission repeater 300 of FIG. 3A from the terminal. It may be composed of a receiving antenna 341 for receiving a signal and a transmitting antenna 342 for transmitting a downlink signal to the terminal.

Also, in another embodiment, the donor unit 310 in the digital transmit repeater 300 of FIG. 3A and the donor unit 310 in the digital transmit repeater 300 of FIG. 3B use a antenna to send signals to the base station. It may be configured to be connected by wire without transmitting / receiving.

As an embodiment, when the digital data demodulation technique of the present invention is used in the WCDMA and WiBro systems, bandwidth reduction may be confirmed as shown in Table 1 below. Bandwidth reduction, which is an effect of the present invention, may vary depending on a modulation scheme and a signal processing scheme.

TABLE 1

system Bandwidth of digital signals
(12bit Sampling) Bandwidth of the modulated signal
(QPSK modulation) Bandwidth reduction WCDMA
(5 MHz) 120 Mbps 7.68 Mbps 93.6% WiBro
(8.75 MHz) 210 Mbps 14.79 Mbps 93.0%

4 is a flowchart illustrating an operation process associated with transmission and reception of a downlink signal in a digital transmission repeater 300 and 300 'according to an embodiment of the present invention, and FIG. 5 is a digital transmission repeater 300 according to an embodiment of the present invention. 300 is a flowchart illustrating an operation process associated with transmission and reception of an uplink signal, and an operation process of the digital transmission repeaters 300 and 300 'according to an embodiment of the present invention will be described below with reference to FIGS. 4 and 5.

First, referring to FIG. 4, referring to an operation process associated with transmission and reception of downlink signals of the digital transmission repeaters 300 and 300 ′, the donor unit 310 receives a downlink signal from a base station. In an embodiment of the present invention, the donor unit 310 may receive a downlink signal using the donor antenna 311, and in another embodiment, may receive a downlink signal using the reception antenna 321. In addition, the donor unit 310 may be connected to the base station by wire to receive the downlink signal.

In operation S402, the received downlink signal is converted into a low frequency signal by the down converter 313, and in operation S403, the converted low frequency signal is converted into a digital signal by the digital converter 314.

Then, in step S404, the digital demodulator 315 demodulates the digital signal into digital data, and in step S405, the digital data is transmitted from the transceiver 316 to the remote unit 330.

In the present invention, by demodulating a digital signal into digital data using the digital demodulator 315, it is possible to extract the digital data included in the received signal to reduce the data size, the digital data of which the data size is reduced the donor unit Since the transmission from the 310 to the remote unit 330, it is possible to reduce the bandwidth required for transmission and increase the transmission efficiency.

In step S406, the transceiver 336 of the remote unit 330 receives digital data from the donor unit 310, and in step S407, the received digital data is modulated into a digital signal in the digital modulator 337.

In step S408, the modulated digital signal is converted into an analog signal in the analog converter 338, and in step S409, the converted analog signal is converted into a high frequency signal in the up-converter 339, and in step S410, It is sent out. In one embodiment of the present invention, the remote unit 330 may transmit a downlink signal using the remote antenna 331, and in another embodiment, the remote unit 330 may use the transmitting antenna 342. You can also send a signal.

The uplink signal goes through a similar process to the downlink signal. Referring to FIG. 5, referring to FIG. 5, an operation process related to transmission and reception of uplink signals of the digital transmission repeaters 300 and 300 ′ is performed. Receive an upstream signal. In one embodiment of the present invention, the remote unit 330 may receive the uplink signal using the remote antenna 331, and in another embodiment, the uplink signal may be received using the reception antenna 341.

In operation S502, the received uplink signal is converted into a low frequency signal by the down converter 333. In operation S503, the converted low frequency signal is converted into a digital signal by the digital converter 334.

Thereafter, in step S504, the digital signal is demodulated into digital data in the digital demodulator 335, and in step S505, the digital signal is transmitted from the transceiver 336 to the donor unit 310.

In the present invention, by demodulating a digital signal into digital data using the digital demodulator 335, the digital data included in the received signal can be extracted to reduce the data size, and the remote unit stores the digital data having the reduced data size. Since the transmission from the 330 to the donor unit 310, it is possible to reduce the bandwidth required for the transmission and increase the transmission efficiency.

In step S506, the transceiver 316 of the donor unit 310 receives digital data from the remote unit 330, and in step S507, the received digital data is modulated into a digital signal in the digital modulator 317.

In step S508, the modulated digital signal is converted into an analog signal by the analog converter 318, and in step S509, the converted analog signal is converted into a high frequency signal by the up-converter 319, and in step S510, by the base station It is sent out. In one embodiment of the present invention, the donor unit 310 may transmit an uplink signal using the donor antenna 311, and in another embodiment, the donor unit 310 may use the transmit antenna 322 to upward. You can also send a signal. In addition, the donor unit 310 may be connected to the base station by wire to transmit an uplink signal.

In the above embodiment, a system composed of one donor unit and one remote unit has been described, but the present invention is not limited thereto, and may be variously applied to a system composed of one donor unit and a plurality of remote units. have. The present invention can also be applied to a system configured such that one donor unit and a plurality of remote units are connected in a stepwise manner.

6 shows a digital transmission repeater consisting of one donor unit and a plurality of remote units. The digital transmit repeater 600 may include a donor unit 601 and a plurality of remote units 602a, 602b, 602c to 602n. The donor unit 601 may be connected to each of the plurality of remote units 602a, 602b, 602c to 602n. Using this connection, the downlink signal received from the base station can be transmitted to a plurality of terminals via the plurality of remote units 602a, 602b, 602c to 602n. In addition, the plurality of remote units 602a, 602b, 602c to 602n respectively transmit the uplink signals received to the donor unit 601, and the donor unit 601 can transmit them to the base station.

FIG. 7 shows a digital transmission repeater configured to cascadely connect one donor unit and a plurality of remote units. The digital transmit repeater 700 may include a donor unit 701 and a plurality of remote units 702a, 702b, 702c through 702n. The donor unit 701 can be cascadely connected to the plurality of remote units 702a, 702b, 702c to 702n. The donor unit 701 is cascadely connected to the plurality of remote units 702a, 702b, 702c to 702n, so that the donor unit 701 is connected to one remote unit 702a and the remote unit 702a is different. It is connected to the remote unit 702b, and the remote unit 702b is connected in a manner of connecting with another remote unit 702c, and one donor unit 701 and a plurality of remote units 702a and 702b are shown in FIG. 702c to 702n are shown embodiments in which the cascade is connected.

Using such a cascaded connection, the downlink signal received from the base station can be transmitted to a plurality of terminals via a plurality of remote units 702a, 702b, 702c to 702n. That is, the donor unit 701 can transmit all the downlink signals to the remote unit 702a, and the remote unit 702a transmits the remaining downlink signals except for the downlink signal that the remote unit 702a transmits to the terminal. 702b). The remote unit 702b may transmit the remaining downlink signals to the remote unit 702c except for the downlink signal that the unit 702b will transmit to the terminal. In this way, the downlink signal to be transmitted to the terminal is delivered to the last remote unit 702n, and the remote unit 702n can transmit the downlink signal to be transmitted to the terminal by the remote unit 702n.

Further, using a cascade connection, the uplink signals received by the plurality of remote units 702a, 702b, 702c to 702n respectively are transmitted to one donor unit 701, and the donor unit 701 transmits them to the base station. Can be. The remote unit 702n may transmit the received uplink signal to the remote unit 702m. The remote unit 702m may transmit the received uplink signal to the remote unit 702l together with the uplink signal received from the remote unit 702n. In this way, all uplink signals to be transmitted to the base station can be collected at the remote unit 702a and transmitted to the donor unit 701.

When using a cascading connection, there is an advantage that the complexity of the donor unit can be reduced. When a plurality of remote units are connected to one donor unit, the transceiving unit of the donor unit may support as many as the number of remote units (for example, the donor unit 601 of FIG. 6) to support 1: 1 connection with the plurality of remote units. In this case, it should have n) transmit and receive ports. Therefore, when the number of remote units increases, the design of the transceiver of the donor unit is disadvantageous, and in order to solve this problem, the remote units can be connected stepwise, which is shown in FIG. That is, in the case of a cascading connection, since the donor unit is connected to one remote unit, there is an advantage that the complexity of the transceiver is not increased.

As another embodiment of the present invention, the digital transmission repeater may further include a distribution unit that handles data transmission and reception between one donor unit and a plurality of remote units. 8 illustrates a digital transmission repeater further including a distribution unit that handles data transmission and reception between one donor unit and a plurality of remote units. The digital transmit repeater 800 includes a donor unit 801, a plurality of remote units 802a, 802b, 802c to 802n, and a distribution unit 803. The distribution unit 803 is for efficiently transmitting and receiving data between one donor unit 801 and a plurality of remote units 802a, 802b, 802c to 802n, and the downlink signal received by the donor unit 801 Are transmitted to the plurality of remote units 802a, 802b, 802c to 802n via the distribution unit 803, and the uplink signals received at the plurality of remote units 802a, 802b, 802c to 802n are distributed to the distribution unit 803. To the donor unit 801 via the terminal. In FIG. 8, an embodiment in which one donor unit and one dispensing unit are connected and one dispensing unit is connected to a plurality of remote units is illustrated, but this is only shown for illustrative purposes, and is not limited thereto. The unit may be connected with a plurality of distribution units, and the distribution unit may be connected with a plurality of remote units.

In the case of using the distribution unit, as in the case of using the cascading connection, there is an advantage of preventing the complexity of the transmitting and receiving unit of the donor unit. For example, in the case where 32 remote units are to be connected to the donor unit, in connection with the connection of the donor unit and the remote unit, 32 remote units must be connected to the transceiver of the donor unit. On the other hand, if four distribution units are connected to the donor unit and eight remote units are connected to each relay unit, the same number of remote units can be connected, but four relay units need to be connected to the transceiver of the donor unit. Since each distribution unit only needs to connect 8 remote units, the complexity of the transceiver can be reduced.

6 to 8, the number of the plurality of remote units has been described as n, but this is for simplicity of description, and the number of the plurality of remote units can be designed without limitation.

As described above, according to the present invention, by demodulating and transmitting the received downlink signal and the uplink signal, and modulating the received downlink signal, the bandwidth required for transmission between the donor unit and the remote unit can be reduced.

Although the invention has been described in detail with respect to particular embodiments, these specific embodiments have been described as examples of the invention and may be applied to other embodiments. It will be apparent to those skilled in the art that various modifications, alternatives, modifications, improvements, and equivalents may be employed, without departing from the scope of the appended claims.

Embodiments of the present invention are further described in the detailed description with reference to the drawings, wherein like reference numerals designate like parts in several of the drawings. With the additional advantages of the present invention, the present invention may be best understood with reference to the detailed description taken in conjunction with the accompanying drawings.

1 is a conceptual diagram of extending a base station using a transmission repeater in a conventional mobile communication system.

2 is a general conceptual diagram of a conventional digital transmission repeater.

3A is a block diagram of a digital transmission repeater according to an embodiment of the present invention.

Figure 3b is a block diagram of a digital transmission repeater according to another embodiment of the present invention.

4 is a flowchart illustrating an operation process associated with transmission and reception of a downlink signal in a digital transmission repeater according to an embodiment of the present invention.

5 is a flowchart illustrating an operation process associated with transmission and reception of an uplink signal in a digital transmission repeater according to an embodiment of the present invention.

6 is a block diagram of a digital transmission repeater composed of one donor unit and a plurality of remote units.

7 is a block diagram of a digital transmission repeater configured to cascadely connect one donor unit and a plurality of remote units.

8 is a block diagram of a digital transmission repeater further including a distribution unit that processes data transmission and reception between one donor unit and a plurality of remote units.

* Description of the main parts of the drawing

101: base station 110: transmission repeater

111: donor unit 112: remote unit

200: conventional digital transmission repeater 210: donor unit

220: remote unit 211: donor antenna

221: remote antenna 212, 222: antenna common

213, 223: down converter 214, 224: digital converter

215, 225: transceiver 216, 226: analog converter

217, 227: up-conversion unit

300: digital transmission repeater according to an embodiment of the present invention

310: donor unit 330: remote unit

311: donor antenna 331: remote antenna

312, 332: antenna common unit 313, 333: down converter

314, 334: digital converter 315, 335: digital demodulator

316, 336: transceiver 317, 337: digital modulator

318, 338: analog converter 319, 339: up converter

321, 341: receiving antenna 322, 342: transmitting antenna

S401: Receiving a Downward Signal

S402: converting the received downlink signal into a low frequency signal

S403: converting the converted low frequency signal into a digital signal

S404: Demodulating Digital Signal into Digital Data

S405: step of transmitting digital data to the remote unit

S406: Receiving Digital Data from Donor Unit

S407: modulating the received digital data into a digital signal

S408: converting a digital signal into an analog signal

S409: converting an analog signal into a high frequency signal

S410: transmitting a downward signal

S501: Receiving an uplink signal

S502: converting the received uplink signal into a low frequency signal

S503: converting the converted low frequency signal into a digital signal

S504: demodulating the digital signal into digital data

S505: step of transmitting digital data to the remote unit

S506: Receiving Digital Data from a Remote Unit

S507: modulating the received digital data into a digital signal

S508: converting a digital signal into an analog signal

S509: converting an analog signal into a high frequency signal

S510: transmitting an uplink signal

600: digital transmission repeater consisting of one donor unit and a plurality of remote units

601 donor unit 602 remote unit

700: digital transmission repeater configured to cascadely connect one donor unit and a plurality of remote units

701: donor unit 702: remote unit

800: a digital transmission repeater further comprising a distribution unit that handles data transmission and reception between one donor unit and a plurality of remote units

801: donor unit 802: remote unit

803: Distribution Unit

Claims (23)

Digital transmission repeater for relaying transmission and reception signals between the base station and the terminal, Including donor unit and remote unit, The donor unit, Demodulate the downlink signal received from the base station into digital downlink data and transmit it to the remote unit; And modulate the digital uplink data received from the remote unit into an uplink signal to transmit to the base station, The remote unit, Demodulate the uplink signal received from the terminal into digital uplink data and transmit the demodulated signal to the donor unit; And modulate the digital downlink data received from the donor unit into a downlink signal and transmit the downlink signal to the terminal. The method of claim 1, The donor unit, A first down converter for converting a high frequency downlink signal received from a base station into a low frequency downlink signal; A first digital converter converting the low frequency downlink signal converted by the first downconverter into a digital downlink signal; A first digital demodulator for demodulating the digital downlink signal converted by the first digital converter into digital downlink data; A first transceiver for transmitting the digital downlink data demodulated by the first digital demodulator to the remote unit and receiving digital upstream data from the remote unit; A first digital modulator for modulating the digital upstream data received by the first transceiver into a digital uplink signal; A first analog converter converting the digital uplink signal modulated by the first digital modulator into an analog uplink signal; And A first upconversion unit converting the analog uplink signal converted by the first analog converter into a high frequency uplink signal, The remote unit, A second down converter for converting a high frequency uplink signal received from a terminal into a low frequency uplink signal; A second digital converter converting the low frequency uplink signal converted by the second downconverter into a digital uplink signal; A second digital demodulator for demodulating the digital uplink signal converted by the second digital converter into digital uplink data; A second transceiver for transmitting digital uplink data demodulated by the second digital demodulator to the donor unit and receiving digital downlink data from the donor unit; A second digital modulator for modulating the digital downlink data received by the second transceiver into a digital downlink signal; A second analog converter converting the digital down signal modulated by the second digital modulator into an analog downlink signal; And And a second upconverter configured to convert the analog downlink signal converted by the second analog converter into a high frequency downlink signal. The method of claim 2, The donor unit, A donor antenna for receiving a downlink signal from a base station and transmitting an uplink signal to the base station; And A first antenna common connected to the donor antenna to separate a downward signal and an upward signal, The remote unit, A remote antenna for receiving an uplink signal from a terminal and transmitting a downlink signal to the terminal; And And a second antenna sharer connected to said remote antenna for separating downlink and uplink signals. The method of claim 2, The donor unit, A first receiving antenna for receiving a downlink signal from a base station; And A first transmitting antenna for transmitting an uplink signal to a base station, The remote unit, A second receiving antenna for receiving an uplink signal from the terminal; And And a second transmit antenna for transmitting the downlink signal to the terminal. The method of claim 2, And the donor unit is wired to the base station. The method of claim 5, The remote unit, A second receiving antenna for receiving an uplink signal from the terminal; And And a second transmit antenna for transmitting the downlink signal to the terminal. The method of claim 5, The remote unit, A remote antenna for receiving an uplink signal from a terminal and transmitting a downlink signal to the terminal; And And a second antenna sharer connected to said remote antenna for separating downlink and uplink signals. The method according to any one of claims 2 to 7, The donor unit is connected to a plurality of remote units, And the first and second transceivers are configured to support a connection between the donor unit and a plurality of remote units. The method according to any one of claims 2 to 7, The donor unit is connected to a plurality of remote units in a stepwise manner, And the first and second transceivers are configured to support a stepwise connection between the donor unit and a plurality of remote units. The method according to any one of claims 2 to 7, A distribution unit which handles data transmission and reception between one donor unit and a plurality of remote units, The donor unit is connected to one or more distribution units, And the distribution unit is connected to a plurality of remote units. A transmission method in a digital transmission repeater including a donor unit and a remote unit, which relays a transmission / reception signal between a base station and a terminal. Converting the high frequency downlink signal received from the base station to the donor unit into a high frequency downlink signal for transmission from the remote unit to the terminal; And Converting the high frequency uplink signal received from the terminal to the remote unit into a high frequency uplink signal for transmission from the donor unit to the base station, Converting the high frequency downlink signal received from the base station to the donor unit into a high frequency downlink signal for transmission from the remote unit to the terminal, Converting the high frequency downlink signal received by the donor unit from the base station to the low frequency downlink signal using the first down converter; Converting the low frequency downlink signal into a digital downlink signal using a first digital converter; Demodulating the digital down signal into digital down data using a first digital demodulator; Transmitting the digital downlink data to the remote unit using a first transceiver; Receiving the digital down data at the remote unit using a second transceiver; Modulating the digital down data received using a second digital modulator into a digital down signal; Converting the digital downlink signal into an analog downlink signal using a second analog converter; And And converting the analog downlink signal into a high frequency downlink signal by using a second up-conversion unit. The method of claim 11, Converting the high frequency uplink signal received from the terminal to the remote unit into a high frequency uplink signal for transmission from a donor unit to a base station, Converting the high frequency uplink signal received from the terminal to the remote unit using the second down converter to a low frequency uplink signal; Converting the low frequency uplink signal into a digital uplink signal using a second digital converter; Demodulating the digital uplink signal into digital uplink data using a second digital demodulator; Transmitting the digital upstream data to the donor unit using a second transceiver; Receiving the digital upstream data from the donor unit using a first transceiver; Modulating the digital upstream data received using a first digital modulator into a digital uplink signal; Converting the digital uplink signal to an analog uplink signal using a first analog converter; And And converting the analog uplink signal into a high frequency uplink signal by using a first upconversion unit. 13. The method of claim 12, Receiving a downlink signal from the base station using a donor antenna before converting the high frequency downlink signal received from the base station to the high frequency downlink signal for transmission from the remote unit to the terminal; After the step of converting the high frequency downlink signal received from the base station to the donor unit into a high frequency downlink signal for transmission from the remote unit to the terminal, transmitting a downlink signal to the terminal using a remote antenna; Receiving an uplink signal from the terminal using the remote antenna before converting the high frequency uplink signal received from the terminal to the high frequency uplink signal for transmission from a donor unit to a base station; And After converting a high frequency uplink signal received from the terminal to a high frequency uplink signal for transmission from a donor unit to a base station, further comprising transmitting an uplink signal to a base station using the donor antenna, A first antenna common connected to the donor antenna is configured to separate a downward signal and an upward signal, And a second antenna common connected to the remote antenna is configured to separate a downlink signal and an uplink signal. 13. The method of claim 12, Receiving a downlink signal from the base station using a first receiving antenna before converting the high frequency downlink signal received from the base station to the donor unit into a high frequency downlink signal for transmission from the remote unit to the terminal; After the step of converting the high frequency downlink signal received from the base station to the donor unit into a high frequency downlink signal for transmission from the remote unit to the terminal, transmitting a downlink signal to the terminal using a second transmitting antenna; Receiving an uplink signal from the terminal using a second receiving antenna before converting the high frequency uplink signal received from the terminal to the high frequency uplink signal for transmission from a donor unit to a base station; And After converting the high frequency uplink signal received from the terminal to the high frequency uplink signal for transmission from the donor unit to the base station, further comprising transmitting an uplink signal to the base station using a first transmitting antenna; Transmission method in digital transmission repeater. 13. The method of claim 12, And said donor unit is connected by wire with a base station. The method of claim 15, Receiving an uplink signal from the terminal using a second receiving antenna before converting the high frequency uplink signal received from the terminal to the high frequency uplink signal for transmission from a donor unit to a base station; And After converting the high frequency downlink signal received from the base station to the donor unit into a high frequency downlink signal for transmission from the remote unit to the terminal, further comprising transmitting a downlink signal to the terminal using a second transmitting antenna; Transmission method in digital transmission repeater. The method of claim 15, After the step of converting the high frequency downlink signal received from the base station to the donor unit into a high frequency downlink signal for transmission from the remote unit to the terminal, transmitting a downlink signal to the terminal using a remote antenna; And Receiving the uplink signal from the terminal using the remote antenna before converting the high frequency uplink signal received from the terminal to the high frequency uplink signal for transmission from a donor unit to a base station; And a second antenna common connected to the remote antenna is configured to separate a downlink signal and an uplink signal. The method according to any one of claims 12 to 17, The donor unit is connected to a plurality of remote units, And the first and second transceivers are configured to support a connection between the donor unit and a plurality of remote units. The method according to any one of claims 12 to 17, The donor unit is connected to a plurality of remote units in a stepwise manner, And the first and second transceivers are configured to support a stepwise connection between the donor unit and a plurality of remote units. Digital transmission repeater for relaying transmission and reception signals between the base station and the terminal, Including donor unit and remote unit, The donor unit, Demodulate the downlink signal received from the base station into digital downlink data and transmit it to the remote unit, The remote unit, And modulate the digital downlink data received from the donor unit into a downlink signal and transmit the downlink signal to the terminal. The method of claim 20, The donor unit, A first down converter for converting a high frequency downlink signal received from a base station into a low frequency downlink signal; A first digital converter converting the low frequency downlink signal converted by the first downconverter into a digital downlink signal; A first digital demodulator for demodulating the digital downlink signal converted by the first digital converter into digital downlink data; A first transceiver for transmitting the digital downlink data demodulated by the first digital demodulator to the remote unit, The remote unit, A second transceiver for receiving digital downlink data from the donor unit; A second digital modulator for modulating the digital downlink data received by the second transceiver into a digital downlink signal; A second analog converter converting the digital down signal modulated by the second digital modulator into an analog downlink signal; And And a second upconverter configured to convert the analog downlink signal converted by the second analog converter into a high frequency downlink signal. Digital transmission repeater for relaying transmission and reception signals between the base station and the terminal, Including donor unit and remote unit, The remote unit, Demodulate the uplink signal received from the terminal into digital uplink data and transmit the demodulated signal to the donor unit; The donor unit, And modulate the digital upstream data received from the remote unit into an uplink signal to transmit to the base station. The method of claim 22, The remote unit, A second down converter for converting a high frequency uplink signal received from a terminal into a low frequency uplink signal; A second digital converter converting the low frequency uplink signal converted by the second downconverter into a digital uplink signal; A second digital demodulator for demodulating the digital uplink signal converted by the second digital converter into digital uplink data; A second transceiver for transmitting the digital upstream data demodulated by the second digital demodulator to the donor unit, The donor unit, A first transceiver for receiving digital upstream data from the remote unit; A first digital modulator for modulating the digital upstream data received by the first transceiver into a digital uplink signal; A first analog converter converting the digital uplink signal modulated by the first digital modulator into an analog uplink signal; And And a first up converter for converting the analog uplink signal converted by the first analog converter into a high frequency uplink signal.

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