KR100918586B1 - Method for controlling a gain of repeater and apparatus thereof - Google Patents

Abstract

The present invention discloses a method and apparatus for controlling a gain of a repeater. In a gain control method of a repeater according to an embodiment of the present invention, detecting a pilot signal of a predetermined output level, and converting the detected pilot signal into a digital signal to calculate an input level of the pilot signal. And controlling gain of the attenuator based on the calculated input level of the pilot signal, wherein the pilot signal is a frequency shift modulation (FSK) pilot signal.

Description

Gain control method of repeater and its device {METHOD FOR CONTROLLING A GAIN OF REPEATER AND APPARATUS THEREOF}

The present invention relates to gain control of a repeater, and more particularly, a pilot signal of a frequency shift keying (FSK) method is used to compensate for a transmission loss generated in a repeater period when a repeater coupled to a base station is cascaded. The present invention relates to a gain control method and apparatus for a repeater that calculates a gain and adjusts a gain of an attenuator based on the calculated transmission loss.

In general, various mobile communication systems including mobile phones and personal mobile communication are largely comprised of a mobile switching center, a base station transceiver subsystem, and a mobile station. It has a constant cell coverage based on radio wave strength and call quality received by the mobile communication terminal.

Therefore, when designing a network, a predetermined area is appropriately arranged and constructed to cover a predetermined area with a plurality of base stations based on such a call radius. Many of these will occur.

Repeater (repeater) is a device for solving such a shadow area, is a transmission medium that receives a signal from the base station and transmits it to the mobile communication terminal.

In an environment where multiple shaded areas exist in a certain area, such as a tall building in an urban area, where a base station is relatively dense, a cascade method is used that connects a plurality of repeaters. Since the transmission line is connected and used, the transmission loss occurs during the relay period.

For example, in the case of the in-building repeater, since the donor repeater and the remote repeater are connected to each other by wires, the length and distributor of the wireline are changed according to the size and structure of the building, which causes a difference in transmission loss.

As such, transmission loss of a wireless signal is generated by a transmission line connected to the relaying period, and the conventional repeater separately configures a circuit for compensating transmission loss to compensate for transmission loss.

However, since the conventional repeater has a separate circuit for compensating for transmission loss, the internal circuit of the repeater becomes complicated, which may cause operational problems.

In addition, since a circuit for compensating for transmission loss is separately configured, there is a problem in that the cost of the repeater is high.

An object of the present invention is to solve the above problems, by using the pilot signal of the FSK modem used for the communication of the relay period to compensate for the transmission loss caused by the transmission period of the relay period, transmission loss The present invention provides a method and apparatus for controlling gain of a repeater which can reduce a unit cost by eliminating a circuit to compensate.

Another object of the present invention is to provide a repeater gain control method and apparatus for compensating transmission loss by using a pilot signal of an FSK modem, thereby reducing the complexity of an internal circuit and eliminating problems that may occur in operation. .

In order to achieve the above object, a gain control method of a repeater according to an aspect of the present invention is a gain control method of a repeater to compensate for the loss caused by the repeater transmission line, the measurement without input data change for a certain period Detecting a pilot signal having a preset output level based on the usage data; Calculating the input level of the pilot signal by converting the sensed pilot signal into a digital signal; Calculating a loss due to the transmission line based on the calculated input level of the pilot signal and the preset level; And controlling the gain of the attenuator for the transmission signal transmitted to the transmission line and the gain of the attenuator for the received signal received from the transmission line to compensate for the calculated loss due to the transmission line. .

In this case, the pilot signal may be a pilot signal of a frequency shift modulation (FSK) method.

In this case, the measurement data may be null data.

In this case, the pilot signal may be received after receiving a status request message for checking the status of the repeater, and may be transmitted at an output level of 0 [dbm].

A gain control apparatus for a repeater according to an aspect of the present invention is a gain control apparatus for a repeater that compensates for losses caused by a repeater transmission line, and is received based on measurement data without data change input for a predetermined period. A detector configured to detect a pilot signal having a preset output level; A calculator configured to convert the sensed pilot signal into a digital signal, calculate an input level of the pilot signal, and calculate a loss due to the transmission line based on the calculated input level of the pilot signal and the preset level; And a control unit for controlling the gain of the attenuator for the transmission signal transmitted to the transmission line and the gain of the attenuator for the received signal received from the transmission line to compensate the loss caused by the transmission line. .

In this case, the gain control apparatus of the repeater may further include a frequency shift modulation modem for performing relay communication, and the pilot signal may be a pilot signal of a frequency shift modulation method output from the frequency shift modulation modem.

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The present invention has the effect of reducing the unit cost by eliminating a circuit for compensating for transmission loss by compensating for transmission loss caused by a relay transmission line using a pilot signal of an FSK modem used for communication in the relay period. have.

In addition, the present invention has the effect of compensating for transmission loss using the pilot signal of the FSK modem, thereby reducing the complexity of the internal circuit and eliminating problems that may occur in operation.

1 is a system diagram for explaining a gain control apparatus of a repeater according to the present invention.

2 is a detailed block diagram of the donor repeater and the remote repeater shown in FIG.

3 is a flowchart illustrating a method of controlling a gain of a repeater according to an embodiment of the present invention.

<Explanation of symbols for main parts of the drawings>

120: donor repeater

130: remote repeater

210: first duplexer

220: first amplifier

230: second amplifier

240: second duplexer

250: control unit of the donor repeater

260: FSK modem

270: detector

280: calculation unit

290: control unit of the remote repeater

Other objects and features of the present invention in addition to the above object will be apparent from the description of the embodiments with reference to the accompanying drawings.

Hereinafter, a method and apparatus for controlling a gain of a repeater according to an exemplary embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3.

1 is a system diagram for explaining a gain control apparatus of a repeater according to the present invention.

Referring to FIG. 1, the system includes a donor repeater 120 and a remote repeater 130.

The donor repeater 120 receives the radio signal transmitted from the base station 110 and transmits the radio signal to the remote repeater 130 installed in the building through the transmission line through the transmission line.

At this time, the donor repeater 120 periodically transmits a status check message for checking the state of the remote repeater 130 to the remote repeater 130. Of course, the donor repeater 120 receives a response message to the status confirmation message from the remote repeater 130.

When the donor repeater 120 transmits the radio signal received from the base station 110 to the remote repeater 130, the donor repeater 120 may read the pilot signal of the FSK modem so that the remote repeater 130 compensates for the transmission loss caused by the transmission line. For example, the set output level is transmitted to the remote repeater 130 at 0 [dbm].

At this time, the donor repeater 120 measures the FSK-based pilot signal 2035 [MHz] so that the transmission loss for the wireless signal received from the base station 110, for example, the WCDMA signal, can be accurately measured by the remote repeater 130. To send.

That is, the transmission frequency of the FSK modem provided in the donor repeater 120 and the remote repeater 130 is 2035 [MHz], and the reception frequency is 2090 [MHz], thereby transmitting using a transmission frequency close to the WCDMA frequency. Compensation for losses can improve the repeater's performance.

Here, it is preferable that the donor repeater 120 and the remote repeater 130 do not perform the relay period data communication while compensating for the loss of the transmission line to accurately compensate for the transmission loss.

The donor repeater 120 receives a pilot signal of the FSK modem from the remote repeater 130 and nulls the pilot measurement for a predetermined time so as to detect a pilot signal used to compensate for the transmission loss caused by the transmission line. ) Enter the data and send it. This is to prevent the change of the detection level according to the data change, and may transmit data that can sense the input level which is not changed for a predetermined time in the remote repeater 130 even though it is not null data.

The remote repeater 130 receives the FSK-type pilot signal received through the transmission line, and detects pilot measurement data, for example, null data, included in the pilot signal.

At this time, the remote repeater 130 may receive a status check message periodically transmitted from the donor repeater 120 and transmit a response message thereto, and may receive a FSK-type pilot signal after receiving the status check message.

The remote repeater 130 converts the pilot signal corresponding to the pilot measurement data into an analog signal FSK-type pilot signal to a digital signal using an analog-to-digital converter, and detects the input level of the converted pilot signal.

The input level of the pilot signal corresponding to the measurement data among the input levels of the converted pilot signal is detected and calculated. That is, the remote repeater 130 detects and calculates the converted digital signal with respect to the pilot signal of a predetermined period in which null data is input among the pilot signals transmitted at the preset output level.

The remote repeater 130 adjusts the gain of the attenuator based on the calculated input level of the pilot signal and the output level of the donor repeater 120.

That is, since the output level of the pilot signal is 0 [dbm], the transmission loss is calculated using the output level and the calculated input level, and the gain of the attenuator is adjusted to compensate for the calculated transmission loss.

2 is a detailed block diagram of the donor repeater and the remote repeater shown in FIG.

Referring to FIG. 2, the donor repeater 120 includes a first duplexer 210, a second duplexer 240, a first amplifier 220, a second amplifier 230, a controller 250, and an FSK modem ( 260).

The remote repeater 130 may include a first duplexer 210, a second duplexer 240, a first amplifier 220, a second amplifier 230, an FSK modem 260, a detector 270, and a calculator. 280 and the control unit 290.

The first duplexer 210 transmits a wireless signal to the first amplifier 220 or receives and outputs a wireless signal output through the second amplifier 230.

That is, the first duplexer 210 of the donor repeater 120 outputs the wireless signal input from the base station to the first amplifier 220, and from the remote repeater 130 amplified by the second amplifier 230. Receives the transmitted radio signal and transmits it to the base station, and the first duplexer 210 of the remote repeater 130 compensates the gain of the attenuator corresponding to the transmission loss of the radio signal generated by the transmission line. The amplification unit 220 outputs the wireless signal, which is compensated for the transmission loss generated by the transmission line, from the second amplifier 230 and outputs the wireless signal to the donor repeater 120 through the transmission line.

The second duplexer 240 also receives and outputs a radio signal output from the first amplifier 220, and outputs a radio signal received by the repeater to the second amplifier 230.

That is, the second duplexer 240 of the donor repeater 120 outputs the wireless signal amplified by the first amplifier 220 adjusted to the preset gain to the remote repeater 130 and from the remote repeater 130. The wireless signal compensated for the transmission loss generated by the transmitted transmission line is received and output to the second amplifier 230, and the second duplexer 240 of the remote repeater 130 transmits the transmission loss generated by the transmission line. The compensated wireless signal is received and output from the first amplifier 220, and the input wireless signal is output to the second amplifier 230 that compensates and outputs the transmission loss to be generated by the transmission line.

The first amplifier 220 amplifies the wireless signal output from the first duplexer 210 through a gain-controlled attenuator and one or more amplifiers and outputs the second signal to the second duplexer 240, and the second amplifier 230. The wireless signal is output from the second duplexer 240 to the first duplexer 210 through a gain-adjusted attenuator and one or more amplifiers.

Here, the first and second amplifiers 220 and 230 of the donor repeater 120 include attenuators having a preset gain, and the first and second amplifiers 220 and 230 of the remote repeater 130. Includes an attenuator in which the gain is compensated according to the transmission loss by the transmission line.

The FSK modem 260 is a modem that performs communication in the relay period. In the present invention, a modem having a transmission frequency of 2035 [MHz] and a reception frequency of 2090 [MHz] is used to transmit and receive a pilot signal of the FSK method.

The control unit 250 of the donor repeater 120 controls the FSK modem 260 to transmit a status confirmation message to the remote repeater 130 to confirm the state of the remote repeater 130, and for example, a preset output level. , 0 [dbm] outputs a pilot signal of the FSK method input null data for a certain period to the remote repeater (130).

At this time, the control unit 250 of the donor repeater 120 may control the gain of the attenuators included in the first and second amplification units 220 and 230 of the donor repeater 120.

Herein, a part of controlling the gain of the attenuator included in the remote repeater 130 according to the transmission loss generated by the transmission line in the present invention will be described.

The FSK modem 260 of the remote repeater 130 receives the status confirmation message from the donor repeater 120 and transmits a response message to the donor repeater 120 through the control by the control unit 290, Receives the FSK-type pilot signal transmitted from the donor repeater 120.

The detector 270 detects a pilot signal having a preset output level received by the FSK modem 260.

The calculator 280 calculates the level of the pilot signal of the FSK method by converting the pilot signal sensed by the detector 270 into a digital signal.

In this case, the calculator 280 may convert the received FSK-type pilot signal into a digital signal and then calculate the level of the digital signal corresponding to the pilot signal to which null data is input for a predetermined period of the converted digital signal.

That is, the calculator 280 calculates an input level for a pilot signal of a null data section in which there is no change of data to calculate an input level of the pilot signal, and uses the calculated input level and the transmission level of the pilot signal. The transmission loss due to the transmission line can be calculated.

The calculation unit 280 calculates a transmission loss based on the input level of the null data interval and the transmission output level of the pilot signal, that is, 0 [dbm].

The control unit 290 is the first amplifier 220 and the second amplifier of the remote repeater 130 so that the transmission loss is compensated based on the input level or the input output level to the transmission output level calculated by the calculation unit 280 The gain of the attenuator included in 230 is controlled.

That is, the controller 290 controls the gain of the attenuator based on the value calculated by the calculator 280 to compensate for the transmission loss generated between the donor repeater 120 and the remote repeater 130, thereby providing a remote repeater 130. ) Transmits the wireless signal received through the donor repeater 120 and the transmission line into the building without transmission loss, and similarly transmits the wireless signal received from the mobile communication terminal, for example, a mobile phone, located within the building without transmission loss. To send).

As described above, the gain control apparatus of the repeater according to the present invention additionally configures a circuit for compensating transmission loss since the transmission loss generated in the relay period is automatically compensated using the FSK-type pilot signal output from the FSK modem 260. no need.

Although the gain control device of the repeater according to the present invention is configured in the remote repeater 130 in FIG. 2, the gain control device of the repeater may be configured in the donor repeater 120 instead of the remote repeater 130.

That is, the donor repeater 120 calculates the transmission loss caused by the transmission line in advance, and controls the gain of the attenuator provided in the donor repeater 120 by using the calculated transmission loss, thereby receiving the radio signal received from the base station. After compensating for the transmission loss generated by the transmission line, the transmission is delivered to the remote repeater 130 to receive a wireless signal without transmission loss from the remote repeater 130 to provide in the building.

Similarly, the donor repeater 120 may receive a radio signal in which a transmission loss occurs from the remote repeater 130 and compensate for the transmission loss generated by the transmission line to transmit a radio signal without a transmission loss to the base station.

In addition, the gain control of the repeater may be performed in both the donor repeater 120 and the remote repeater 130, rather than the donor repeater 120 or the remote repeater 130. For example, the donor repeater 120 may compensate for the transmission loss in the forward direction and transmit the wireless signal, and the transmission loss in the reverse direction may be compensated in the remote repeater 130 and may be transmitted. The repeater 130 may be compensated and transmitted, and the donor repeater 120 may compensate for the transmission loss for the reverse direction.

3 is a flowchart illustrating a method of controlling a gain of a repeater according to an embodiment of the present invention.

3 is an operation flowchart of a process of compensating for transmission loss in a remote repeater.

Referring to Figure 3, the gain control method of the repeater receives a status confirmation message for confirming the status of the remote repeater transmitted from the donor repeater (S310).

Here, the remote repeater receives a status confirmation message periodically transmitted from the donor repeater, and transmits a response message to the donor repeater.

After receiving the status check message, the remote repeater receives the FSK-type pilot signal (S320).

In this case, the pilot signal received by the remote repeater may be a pilot signal output as a preset transmission output level, for example, 0 [dbm] in the donor repeater.

Here, the pilot signal of the FSK method includes the measurement null data input for a predetermined time so that the input level of the pilot signal can be calculated in the remote repeater.

The transmission frequency of the FSK modem 260 used in the present invention uses a frequency close to the radio signal frequency to accurately compensate for the transmission loss by measuring the transmission loss for the radio signal received from the base station.

For example, in the case of WCDMA, the donor repeater and the remote repeater use an FSK modem 260 having a transmission frequency of 2035 [MHz] and a reception frequency of 2090 [MHz], so that the transmission loss of the WCDMA radio signal can be measured approximately. .

The remote repeater senses measurement data for calculating an input level from the received pilot signal (S330).

The pilot signal corresponding to the sensed measurement data is converted into a digital signal using an analog-to-digital converter (S340).

Of course, the remote repeater converts the received pilot signal into a digital signal instead of converting only the pilot signal corresponding to the measurement data into a digital signal, but the present invention calculates the input level of the pilot signal using the measurement data. The pilot signal corresponding to the measurement data is converted into a digital signal.

The input level of the pilot signal corresponding to the measurement data is calculated using the converted digital signal (S350).

That is, in order to calculate the transmission loss using the FSK-based pilot signal, the input level for the transmission output level of the pilot signal is calculated. In the present invention, the input level is calculated in a section in which null data which is the same data is input.

When the input level of the pilot signal is calculated, the gain of the attenuator included in the remote repeater is controlled based on the calculated input level (S360).

That is, the transmission loss is calculated based on the transmission output level and the input level of the pilot signal, and the gain of the attenuator is controlled based on the calculated transmission loss.

The gain control method and apparatus thereof of the repeater according to the present invention can be modified and applied in various forms within the scope of the technical idea of the present invention and are not limited to the above embodiments. In addition, the embodiments and drawings are merely for the purpose of describing the contents of the invention in detail, not intended to limit the scope of the technical idea of the invention, the present invention described above is common knowledge in the technical field to which the present invention belongs As those skilled in the art can have various substitutions, modifications, and changes without departing from the spirit of the present invention, it is not limited to the embodiments and the accompanying drawings. And should be judged to include equality.

Claims (9)

In the gain control method of the repeater to compensate for the loss caused by the repeater transmission line, Detecting a pilot signal of a predetermined level received based on measurement data having no data change input for a predetermined period; Calculating the input level of the pilot signal by converting the sensed pilot signal into a digital signal; Calculating a loss due to the transmission line based on the calculated input level of the pilot signal and the preset level; And Controlling the gain of the attenuator for the transmission signal transmitted to the transmission line and the gain of the attenuator for the received signal received from the transmission line to compensate for the calculated losses due to the transmission line. Gain control method of the repeater comprising a. The method of claim 1, The pilot signal is A gain control method of a repeater, characterized in that the frequency shift modulation (FSK) pilot signal. delete The method of claim 1, The measurement data is Gain control method of a repeater, characterized in that the null data. The method of claim 1, The pilot signal is The gain control method of the repeater, characterized in that received after receiving a status request message for checking the state of the repeater. The method of claim 1, The pilot signal is A gain control method for a repeater, characterized in that transmitted at a level of 0 [dbm]. In the gain control device of the repeater for compensating for the loss caused by the repeater transmission line, A detector for detecting a pilot signal of a preset output level based on measurement data without a change in data input during a predetermined period; A calculator configured to convert the sensed pilot signal into a digital signal, calculate an input level of the pilot signal, and calculate a loss due to the transmission line based on the calculated input level and the output level of the pilot signal; And Control unit for controlling the gain of the attenuator for the transmission signal transmitted to the transmission line and the gain of the attenuator for the received signal received from the transmission line to compensate for the loss caused by the transmission line calculated Gain control device of the repeater comprising a. The method of claim 7, wherein The gain control device of the repeater Frequency Shift Modulation Modem Performing Relay Period Communication More, The pilot signal is And a frequency shift modulation pilot signal output from the frequency shift modulation modem. delete