KR20090029060A - Method and apparatus for auto-setting gain of optical repeater and detecting spurious - Google Patents

Abstract

A method and an apparatus for automatically setting a gain of an optical repeater and detecting a spurious wave are provided to reduce setting deviation per a worker according to measurement error of reverse RF output. Output of a signal is measured through an output measurement unit or a spectrum analysis unit(S102). A comparison unit compares data measured through the output measurement unit or the spectrum analysis unit with a reference value(S104). According to a result value of the comparison unit, a controller controls a gain of the optical repeater(S106). A display unit receives an adjustment situation of the gain of the optical repeater from the controller. The received data are displayed on a monitor(S108).

Description

Optical repeater gain automatic setting and unwanted wave detection method and apparatus {Method and apparatus for auto-setting gain of optical repeater and detecting spurious}

The present invention relates to an optical repeater gain automatic setting and a method for detecting unwanted waves, and more particularly, to prevent errors due to manual operation and to easily set up an optical repeater, and to monitor the unwanted waves flowing into the base station in real time. The present invention relates to an optical repeater gain automatic setting and a method for detecting unwanted waves.

Today, there are three major mobile communication systems worldwide. First, the Global System for Mobile Communication (GSM) system centered on Europe, the second generation mobile communication system, and Second, the synchronous CDMA (Code Division Multiple Access) 2000 system centered on Korea and the US, the third generation system, and Third, Europe, the third generation system. The central UMTS (Universal Mobile Telecommunication Services) system is used.

As such, as the mobile communication system develops, a high quality mobile communication service is required in all areas, such as mountainous areas where mobile communication services cannot reach properly, or radio wave shading areas such as remote islands or underground spaces of buildings. However, it is economically inefficient to construct and operate a base station at a high cost in an area where the demand for mobile communication service is low to accommodate such a demand. Therefore, in order to satisfy such a demand, a method of installing a repeater instead of a base station which requires a lot of maintenance costs is used.

The repeater includes a wireless relay method using a microwave, a wired relay method using a coaxial cable, and an optical relay method using a laser or an optical cable. Of these, the optical repeater, which is superior in terms of performance and economics, converts an RF signal received from a base station into an optical signal, transmits it to a designated remote area through an optical path, and then reproduces it as an RF signal and transmits it to the outside through an antenna. Is implemented.

If you want to set up an optical repeater, a trained operator sets up manually with a measuring instrument that can measure the RF output. At this time, since the operator has to read and judge the measured value of the instrument directly, not only a lot of skilled professionals are required to set up the equipment, but also an error may occur in the setting by the operator, so the method of automatically setting the optical repeater is possible. And devices are needed.

In addition, since an unwanted signal that impairs the call quality may be introduced into the signal received by the base station, a method and an apparatus capable of monitoring in real time in order to remove such an unwanted signal are required.

Therefore, the problem to be solved by the present invention is to prevent the error caused by the manual operation and easily set up the optical repeater, the automatic repeater gain automatic setting and the unwanted wave detection method that can monitor the unwanted wave flowing into the base station in real time Is to provide.

Another problem to be solved by the present invention is to prevent the error caused by manual operation and easily set up the optical repeater, the optical repeater gain automatic setting and the unwanted wave detection apparatus that can monitor the unwanted wave flowing into the base station in real time It is to provide.

The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned will be clearly understood by those skilled in the art from the following description.

In accordance with an aspect of the present invention, there is provided an optical repeater gain automatic setting and unwanted wave detection method including measuring output of a reverse RF signal of a base station, and outputting a predetermined range of the reverse RF signal. Comparing a reference value having, and adjusting the gain of the optical repeater according to the output of the reverse RF signal and the comparison result of the reference value.

In accordance with another aspect of the present invention, an optical repeater gain automatic setting and an unwanted wave detection apparatus includes an output measuring unit measuring an output of a reverse RF signal of a base station, an output of the reverse RF signal, and a predetermined output; And a control unit for comparing a reference value having a range of and a gain of the optical repeater according to a result of comparing the output of the reverse RF signal and the reference value.

According to another aspect of the present invention, there is provided an optical repeater gain automatic setting and unwanted wave detection apparatus including an output measuring unit measuring an output of a reverse RF signal of a base station, and output waveform information of the reverse RF signal. A spectrum analyzer for analyzing the waveform, a comparator for detecting the normal waveform and the unwanted waveform using the waveform information collected by the spectrum analyzer, and storing the screen of the unwanted waveform to the control center when the unwanted waveform is detected. It includes a transmission unit for transmitting.

According to the optical repeater gain automatic setting and the unwanted wave detection method and apparatus according to the embodiments of the present invention as described above, there are the following effects.

First, it is possible to reduce the setting deviation for each operator according to the measurement error of the reverse RF output.

Second, by monitoring the unwanted signal flowing into the base station in real time, it is possible to immediately and actively deal with problems.

Third, the RF output value of the base station and the information about the unwanted wave are stored in the memory to facilitate post-hourly management of the base station and the optical repeater.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the present embodiments are intended to complete the disclosure of the present invention, and the general knowledge in the art to which the present invention pertains. It is provided to fully convey the scope of the invention to those skilled in the art, and the present invention is defined only by the scope of the claims.

1 is a diagram schematically illustrating a mobile communication system including an optical repeater gain automatic setting and a wave detection device according to an embodiment of the present invention. The mobile communication system 1 includes a base station 10, an optical repeater 20, a mobile terminal 40, and an optical repeater gain automatic setting and an unwanted wave detection device 30.

The base station 10 generates a transmitted RF signal and transmits it to the master unit 21 of the optical repeater 20, and processes the received RF signal transmitted from the master unit 21. The base station 10 includes a radio wave transmitter and a radio wave receiver. The radio wave transmitter receives the input signal from the channel card, amplifies the signal through the transceiver, separates the signal to be transmitted to the optical repeater through the directional coupler and the signal to be transmitted through the antenna from the base station, and then sends some signals to the optical repeater. And, some signals are transmitted directly from the base station through the antenna. Meanwhile, the radio wave receiver low noise amplifies the signal received through the receiving antenna through the low noise amplifier, mixes the signal received from the optical repeater through the directional coupler, and transmits the signal to the channel card through the transceiver.

Referring to FIG. 1, the present specification mainly describes a configuration of a radio wave receiver among various components of the base station 10 in order to describe reverse signals input through the radio wave receiver. The base station 10 is a low noise amplifier 11 for low noise amplification of the received signal, a directional coupler 12 for mixing the signal coming from the optical repeater 20 and the signal directly flowing through the antenna and branching the mixed signal The transceiver 13 is included.

The optical repeater 20 is composed of a master unit 21 for the transmission and reception signal link with the base station 10 and a remote unit 22 for the transmission and reception signal link with the mobile terminal 40. The master unit 21 and the remote unit 22 are generally connected via an optical cable of about 2 to 20 km.

The master unit 21 amplifies the transmitted RF signal input from the base station 10, converts the converted RF signal into an optical signal, and multiplexes the converted signal to the remote unit 22 through the optical path. In addition, the master unit 21 demultiplexes an optical signal input from the remote unit 22 through the optical path, converts the optical signal into a received RF signal, and transmits the received RF signal to the base station 10. The remote unit 22 demultiplexes the optical signal input from the master unit 21 according to frequency, converts the optical signal into a transmission RF signal, amplifies through a high power amplifier (HPA, not shown), and then filters and antennas. Through the mobile terminal 40 to transmit. In addition, the remote unit 22 filters the received RF signal input from the mobile terminal 40 through the antenna, amplifies it through a Low Noise Amplifer (LNA, not shown), and then uses Wavelength Division Multiplexing; WDM) is converted into an optical signal and transmitted to the master unit 21 through the optical path.

Hereinafter, the optical repeater gain automatic setting and the unwanted wave detection apparatus according to an embodiment of the present invention will be described in detail with reference to FIG. 2. 2 is a block diagram of an optical repeater gain automatic setting and a wave detection apparatus according to an embodiment of the present invention, Figure 3 is a diagram schematically showing the spectrum of the normal signal and the wave signal.

The optical repeater gain automatic setting and the unwanted wave detection device 30 receives the reverse RF signal from the base station 10 to automatically set the optical repeater, and generates an alarm when the unwanted signal intervenes in the RF signal. The optical repeater gain automatic setting and the unwanted wave detection device 30 includes an output measuring unit 100, a spectrum analyzer 200, a comparator 300, a controller 700, a transmitter 400, and a storage 500. ) And the display unit 600.

The output measuring unit 100 receives the reverse RF signal from the base station 10 and measures the output level. The reverse RF signal may extract a branched signal from the transceiver 13. The reverse RF signal extracted from the transceiver 13 is a signal formed by mixing a signal input directly into the base station 10 through the antenna and the signal input from the optical repeater 20 through the directional coupler 12, and includes an optical repeater ( 20) and the state of both the base station 10 can be monitored.

The spectrum analyzer 200 may distinguish the stationary wave signal and the unwanted wave signal by analyzing the frequency spectrum of the reverse RF signal. When the reverse RF signal is analyzed through the spectrum analyzer 200, the standing wave signal and the unwanted wave signal show unique waveforms as shown in FIG. The waveform of such a signal can be analyzed to detect an unwanted wave. In addition, the spectrum analyzer 200 may measure the output of the reverse RF signal through spectrum analysis. That is, although the output measuring unit 100 may be configured as a separate device inside the optical repeater gain automatic setting and the unwanted wave detection device 30, since the output may be measured using the spectrum analyzer 200, It can also be configured as a single device that includes all the functions.

The comparator 300 compares the data extracted by the output measuring unit 100 or the spectrum analyzer 200 with a reference value to determine whether the gain of the optical repeater 20 is adjusted, or an unwanted signal is added to the reverse RF signal. Determine if it is included. The comparison unit 300 compares the reference value set in the range of the output signal level with the output value input through the output measurement unit 100, and outputs a signal regarding whether the gain of the optical repeater 20 is adjusted to the control unit 700. do.

On the other hand, the comparator 300 determines whether or not the unnecessary wave is included in the reverse RF signal based on the data received through the spectrum analyzer 200. The comparator 300 compares a predetermined reference value of the standing wave signal with data received through the spectrum analyzer 200. In this case, when the possibility of the interference signal is high, the comparator 300 transmits the spectrum analysis result to the storage 500, the display 600, and the transmitter 400.

The controller 700 adjusts the gain of the optical repeater 20 according to the result value of the comparator 300. The controller 700 may adjust the gain of the optical repeater 20 in real time according to the level of the reverse RF signal of the base station 10. The controller 700 may further include a time controller (not shown) to measure the reverse RF signal at a specific time to adjust the gain of the optical repeater 20. In the case of using such a time controller (not shown), the gain of the optical repeater 20 can be adjusted at regular time intervals, so that constant reliability can always be obtained at a low operating cost.

The transmitter 400 transmits the result of the comparator 300 to the control center where the base station 10 or the operator can check. Here, the control center is a generic term for a place where necessary measures can be taken by monitoring the result value of the comparator 300, and may be a base station 10 or a network for controlling the same. The transmitter 400 transmits the spectrum analysis result together with the determination result from the comparator. The spectrum analysis result may be transmitted by capturing a screen shown on the monitor.

On the other hand, the transmission unit 400 may further include an alarm unit (not shown) for providing an alarm to the control center according to the result value of the comparison unit 300. In other words, if immediate action is required as a result of the determination of the comparator 300, an alarm is triggered to enable immediate action.

The storage unit 500 stores the determination result and the spectrum analysis result of the comparator 300. In other words, the real-time monitoring results are stored so that the operator can use them as judgment data when necessary. The storage unit 500 stores the determination and analysis results for each time, and then provides determination data for operating the base station 10 and the optical repeater 20.

The display unit 600 displays a series of processes such as the results of the output measuring unit 100 and the spectrum analyzer 200 and the determination result of the comparator 300. The display unit 600 is preferably formed as a screen that can show both equations, graphs, and the like, like a liquid crystal display, but may be formed by various display means according to the equipment situation.

Hereinafter, an automatic setting method of the optical repeater gain will be described in detail with reference to FIG. 4. 4 is a flowchart illustrating an optical repeater gain automatic setting method according to an embodiment of the present invention.

First, the reverse RF signal of the base station 10 is received and the output of the signal is measured through the output measuring unit 100 or the spectrum analyzer 200 (S102). The data of the signal measured through the output measuring unit 100 or the spectrum analyzer 200 is transmitted to the comparator 300.

The comparison unit 300 compares the data measured through the output measurement unit 100 or the spectrum analyzer 200 with a reference value (S104). If the comparison unit 300 does not meet the reference value, the comparison unit 300 transmits the result value.

The control unit 700 adjusts the gain of the optical repeater 20 according to the result of the comparison unit 300 (S106). On the other hand, the control condition of the optical repeater 20 gain is transmitted to the display unit 600.

The display unit 600 receives the adjustment state of the optical repeater 20 gain from the control unit 700 and displays it on the monitor (S108).

Hereinafter, an automatic setting method of the optical repeater gain will be described in detail with reference to FIG. 5. 5 is a flowchart of a method for detecting a wave in accordance with an embodiment of the present invention.

First, the reverse RF signal of the base station 10 is received and the spectrum of the signal is extracted through the spectrum analyzer 200 (S202). The spectrum data extracted through the spectrum analyzer 200 is transmitted to the comparator 300.

The comparator 300 compares the spectral data with a reference value (S204). The reference value contains information about the normal waveform and determines whether or not an unwanted wave is involved in the spectral data other than the normal waveform. When it is determined that the unwanted wave of the normal waveform is involved, the comparator 300 transmits the spectral data, the comparison result, and the corresponding screen to the transmitter 400 and the storage 500.

The transmitter 400 transmits the screen to the control center (S206). In addition, if immediate action is needed, an alarm is triggered to enable immediate action.

The storage unit 500 stores spectral data, a comparison result, and a corresponding screen (S208). If it is determined that the clutter signal is involved, it is possible to save each data over time to be used as judgment data for the equipment operation afterwards.

Although embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. I can understand that. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.

1 is a diagram schematically illustrating a mobile communication system including an optical repeater gain automatic setting and a wave detection device according to an embodiment of the present invention.

2 is a block diagram of an optical repeater gain automatic setting and a wave detection apparatus according to an embodiment of the present invention.

3 is a view schematically showing the spectrum of a normal signal and an undesired signal.

4 is a flowchart illustrating an optical repeater gain automatic setting method according to an embodiment of the present invention.

5 is a flowchart of a method for detecting unwanted waves according to an exemplary embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

10: base station 11: low noise amplifier

12: Directional Coupler 13: Transceiver

20: optical repeater 21: master unit

22: remote unit

30: Optical repeater gain automatic setting and clutter detection device

100: output measurement unit 200: spectrum analysis unit

300: comparison unit 400: transmission unit

500: storage unit 600: display unit

700: control unit

Claims (17)

Measuring the output of the reverse RF signal of the base station; Comparing the output of the reverse RF signal with a reference value having a predetermined range; And adjusting the gain of the optical repeater according to a result of comparing the output of the reverse RF signal with the reference value. The method of claim 1, An optical repeater gain automatic setting and unwanted wave detection method further comprising the step of monitoring the progress of each step. The method of claim 1, And detecting the unwanted wave at the output of the reverse RF signal. The method of claim 3, wherein The step of detecting the unwanted wave is an optical repeater gain automatic setting and unwanted wave detection method for detecting the standing wave and the unwanted wave through the spectrum analysis. The method of claim 3, wherein And if the unwanted wave is detected in the detecting of the unwanted wave, storing the screen and transmitting the screen to a control center. The method of claim 5, And providing an alarm signal to the control center. The method of claim 3, wherein And if the clutter is detected, storing the result of the spectrum analysis in a memory. The method of claim 1, Wherein each of the above steps is automatically scheduled and executed at a predetermined time. The method of claim 1, The output of the reverse RF signal is an optical repeater gain auto-setting and unwanted wave detection method received from the transceiver of the base station. An output measuring unit measuring an output of the reverse RF signal of the base station; A comparison unit comparing the output of the reverse RF signal with a reference value having a predetermined range; And a control unit for adjusting gain of an optical repeater according to a result of comparing the output of the reverse RF signal with the reference value. The method of claim 10, Optical repeater gain automatic setting and wave detection apparatus further comprises a display unit for monitoring the progress of each device. The method of claim 10, And a spectrum analyzer configured to analyze output waveform information of the reverse RF signal. The method of claim 12, And the comparator detects the stationary waveform and the unwanted waveform using the waveform information collected by the spectrum analyzer. The method of claim 12, And a transmitter configured to store and transmit a screen of the unnecessary waveform to the control center when the unwanted waveform is detected. The method of claim 14, And an alarm unit for providing an alarm signal to a control center when the unwanted wave is detected. The method of claim 12, And a storage unit for storing the result of spectrum analysis of the output of the reverse RF signal. The method of claim 10, An optical repeater gain automatic setting and unwanted wave detection method further comprising a time control unit for providing time information to each device.

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