KR100741939B1 - Oscillating perception device of repeater - Google Patents

Abstract

The present invention relates to a repeater having an automatic gain control (AGC) function, and more particularly, to an oscillation detection control device of a repeater to detect an oscillation pattern by detecting a change in output according to a change in gain so as to inform an administrator. will be.

When oscillation occurs and the repeater output becomes over output, the repeater is shut down to protect the base station. The user or operator can judge the simple overpower and reset the equipment. In this case, the repeater restarts the oscillation. The vicious cycle is repeated.

The present invention is applied to a repeater having an automatic gain control function to recognize whether the output is generated by the oscillation of the repeater when the overpower occurs or whether the general overpower is generated, and indicates this (indication) by the user or operator by the oscillation It is intended to provide a repeater oscillation detection control device that can determine whether a shutdown is caused by an overpower or a shutdown.

Repeater, Repeater Oscillation, Oscillation, Isolation, Isolation, Isolation, AGC

Description

Oscillating perception device of repeater

1 is a block diagram showing the configuration of a typical RF repeater.

Figure 2 is a block diagram showing the configuration of the oscillation detection control device of the repeater of the present invention.

3 is a waveform diagram showing a normal automatic gain control operation according to the input change in the present invention.

4 is a waveform diagram showing an automatic gain control operation when oscillation occurs due to lack of isolation in the present invention.

5 is a flowchart illustrating a process of detecting an oscillation through a change in an output level according to a gain change in the present invention.

The present invention relates to a repeater having an automatic gain control (AGC) function, and more particularly, the oscillation detection control device of the repeater to recognize the oscillation by detecting the change pattern of the output according to the gain change, and to inform the administrator It is about.

The present invention is directed to a wireless relay device, in particular to solve the problems caused by the oscillation generated in the mobile communication wireless relay device.

Due to the rapid development of mobile communication services, high quality services are required in mountain wallpaper, remote islands, urban radio blind spots, subways, tunnels, and apartment complexes, where mobile communication services have not been fully provided to non-demand areas.

In order to provide high-quality services in the radio wave area, the telecommunication service provider must invest heavily in the expansion of base stations in the radio blind area, which may worsen the management balance of the telecommunication service provider and cause losses due to enormous investment inefficiency in the country. As a countermeasure, 'relay system' can be used to improve high communication quality and service range at low cost.

Due to the geographical characteristics of Korea and the specificity of the population density, it is necessary to take measures against many shaded areas in designing the optimal wireless environment, and to use the wireless network by repeaters to solve the transliteration area where the radio channel between the base station and terminal is disconnected. To design.

A repeater is a shade area by amplifying the signal so that the signal from the base station can reach a shade area such as a tunnel or underground parking lot that is difficult to reach due to a mountain, a building, or other features. A device that connects a signal of a terminal to reach a base station.

In addition, recently, it is being used for expanding cell coverage at low cost, and the most common type of repeater is an RF repeater.

2 is a block diagram schematically illustrating a configuration of a general RF repeater.

Referring to the schematic principle of operation, the base station signal received through the donor antenna 1 is input to the low noise amplifier (LNA) 3 through the duplexer 2 to amplify low noise, and the amplified signal is a local oscillator. Downconvert to the intermediate frequency by mixing with the oscillation frequency in (4).

In the intermediate frequency band, the surface acoustic wave (SAW) filter (5) with excellent skirt characteristics passes through only the desired frequency band, upconverts it, amplifies it through a high power amplifier (6), and then shades it with a service antenna. Serve the area.

On the contrary, the signal of the terminal is received by the service antenna and amplified and filtered through the filter and the amplifier, and then connected to the base station through the Donor antenna.

The advantage is that it is suitable for small building services, and the cost of the facility is very low, but the biggest disadvantage is the problem of securing antenna isolation.

In general, the oscillator oscillation occurs when the isolation between the donor antenna and the service antenna is equal to or less than the repeater gain.

Depending on the type of repeater, the installation environment is different, but repeaters using optical repeaters or microwaves are automatically separated by a few Km between antennas, thereby automatically securing isolation.

However, RF repeaters installed indoors and underground or on the ground are always a matter of securing antenna isolation, and there are frequent cases of oscillation due to lack of isolation in actual field.

As such, when oscillation occurs due to lack of isolation, not only the surroundings of the repeater but also the base station may be affected, which may cause a call failure in the service area of the base station.

In general, when oscillation occurs and the repeater output is over-powered, the repeater is shut down to protect the base station. The user or operator can judge the device as simple overpower and reset the equipment. The vicious cycle of rash is repeated.

In addition, in case of repeater with auto gain control (AGC) function, even if over output by oscillation occurs, output level is adjusted by continuously adjusting gain regardless of whether it is over output by oscillation or over output by input. Therefore, in the case of the occurrence of the overpower due to the oscillation, the gain and output of the repeater may be repeatedly changed to provide a reliable operation of the repeater.

In view of the above, in the present invention, as described above, when an overpower occurs, it is recognized by distinguishing whether it is an overpower occurrence or a general overpower occurrence due to the oscillation of the repeater, and indicating this to the user or operator to the oscillation. It is to provide a repeater's oscillation detection control device that can check whether the shutdown caused by the shutdown or overpower.

The present invention is a repeater having an automatic gain control function,

Oscillation determination means for detecting the oscillation by detecting the change pattern of the output according to the gain change of the repeater, and recognizes the oscillation by the oscillation determination means to control the operation of the device, indicating that the operation is shut down by oscillation Control means for performing a control display, and display means for operating by the control means for notifying the shutdown due to the oscillation to the outside.

Referring to the embodiment of the present invention as shown in FIG. 2, the configuration and operation process will be described in detail as follows.

An automatic gain control unit (AGC) 10 that provides a voltage for gain control proportional to a change in the intensity of a radio wave as an input of an output frequency signal of a repeater;

The oscillation determination unit 21 detects whether the oscillation is detected by detecting the change pattern of the output according to the gain change, and the oscillation determination unit 21 recognizes the oscillation and controls the operation of the device (S / D control) A control unit 20 including an oscillation operation control unit 22 for performing a control display informing that the operation is shut down by the controller;

And a display unit 30 for notifying the shutdown due to the oscillation to the outside.

Such a present invention,

Applied to the repeater including the automatic gain control unit 10, the oscillation determination unit 21 for determining the oscillation and the oscillation operation control unit 22 for the operation control according to the result determined by the oscillation determination unit 22 And a display unit 20 for displaying the operation result by oscillation.

The oscillation judging unit 21 includes a comparison means for comparing the change in the repeater output according to the gain change, and includes an oscillation judging means for judging as the oscillation when the change of the repeater output due to the change in the gain appears repeatedly. do.

In other words, the variation of the output due to the change of gain is greatly monitored by using the dispersion of mathematical statistics techniques to prevent an error in the exceptional situation and to determine whether the oscillation is accurate.

The oscillation operation control unit 22 includes operation control means for determining (operating or not shutting down) the operation of the repeater according to the determination result of the oscillation determination unit 21 and display control means for display control thereof.

The display unit 30 is composed of LEDs, and informs that the shutdown by the oscillation.

In this case, two or more LEDs may be configured, and the lighting combination thereof may be configured to notify the shutdown due to the oscillation, and in this case, the present invention may also be applied to the case of shutting down by other examples.

In addition, a key input unit 40 including a key for enabling a reset by an administrator when a shutdown due to oscillation occurs is configured, and in the case of a reset key for reactivating the repeater when the shutdown occurs due to oscillation The reset judging means can be configured in the control unit 20 so as to be recognized as a reset only when there is an input.

Referring to the operation of the present invention having such a configuration in detail as follows.

The present invention is to control the repeater by detecting when the repeater oscillates due to the lack of isolation between the antenna or the equipment input and output in the repeater with the automatic adjustment function according to the input and output changes.

The automatic gain control unit 10 receives the output frequency signal as an input and supplies a voltage for gain control of the local oscillator for intermediate frequency conversion according to the output change.

That is, the automatic gain control unit 10 performs a process of adjusting the gain value according to the change of the output so that the output of the repeater can be normally maintained constant.

The oscillation determination unit 21 determines whether the oscillation is performed by monitoring the change of the output signal according to the gain change by inputting the gain control voltage and the repeater output of the automatic gain control unit 10.

If oscillation occurs due to failure of isolation, when the forward automatic gain adjustment function is performed, the oscillation signal exceeds the AGC level, and the gain of the repeater is swung.

The oscillation judging unit 21 detects that the gain and output of the repeater are repeatedly rocking for a predetermined period, and determines that the oscillation is performed.

3 is a waveform diagram illustrating a normal automatic gain adjustment operation according to an input change, and FIG. 4 is a waveform diagram illustrating an automatic gain adjustment operation when an oscillation phenomenon occurs due to lack of isolation.

As shown in FIG. 4, when oscillation occurs, it can be seen that the gain and the output are repeatedly swung despite the change in the input.

In the oscillation determination unit 21, if such a pattern occurs for a predetermined period, it is determined that the oscillation is generated by the oscillation.

The algorithm thereof is described in detail as follows.

If the oscillation does not occur, the output of the repeater is kept substantially constant as shown in FIG.

However, if the isolation between the antennas or the equipment inputs and outputs is insufficient, the repeater oscillates, and the gain of the repeater is changed by the oscillation signal.

That is, when the oscillation occurs, the repeater recognizes that the overpower occurs and tries to reduce the output level by lowering the gain of the repeater.

At this time, the oscillation is not resolved until the gain of the repeater becomes smaller than the isolation between the antennas or the repeater input and output, and the overpower continues to occur.

If the gain of the repeater is smaller than the isolation between the antennas or the repeater inputs and outputs, the oscillation is eliminated and the output level is significantly lowered.

Therefore, the repeater detects a significantly lowered output level and judges it as a low output, thereby increasing the gain of the repeater and performing automatic gain adjustment for adjusting to a normal output level.

Since the gain of the repeater increases gradually, the output of the repeater increases, but as the gain decreases, the repeater oscillates again when the gain of the repeater becomes greater than the isolation between the antenna or repeater input and output, and the output of the repeater exceeds the normal output. It becomes very big.

5 is a flowchart summarizing this process.

When this process is repeated, as a result, the gain of the repeater is repeatedly decreased and increased by the oscillation, and the output of the repeater is also greatly reduced and increased.

In this case, the repeater that has oscillation due to lack of isolation between the antennas or the input and output of the repeater is similar to the point where the output change suddenly occurs.

By repeating this measurement, if the above phenomenon occurs continuously within a certain range, it is recognized that the phenomenon is caused by the oscillation of the repeater.

When the oscillation operation control unit 22 determines that oscillation is determined by the oscillation determination unit 21 as described above, the repeater is shut down, and the display unit 30 is operated to inform that the shutdown has occurred due to the oscillation.

The administrator checks the display state of the display unit 30, recognizes that the shutdown has occurred due to oscillation, and takes measures to secure isolation such as antenna adjustment or equipment input / output adjustment.

Thereafter, the manager operates the key input unit 40 to reset the repeater.

At this time, the control unit 20 recognizes the reset only when the reset key of the key input unit 40 is pressed for a predetermined time (for example, 5 sec) to reset the repeater.

This is an example for preventing the repetition error as described in the related art when the reset key is operated without the action of oscillation.

Applying the present invention as described above, it is very effective that the administrator can determine whether the oscillation only by simple monitoring without artificial control in the operating state of the repeater can take the corresponding action quickly.

This invention is applicable to all repeaters with automatic gain control.

Claims (3)

delete In the repeater with automatic gain control function, Oscillation judging means for detecting the change pattern of the output according to the gain change of the repeater, and counting the number of times generated during the predetermined time for the detected change pattern and comparing with the predetermined reference number to determine whether the oscillation or not, and the oscillation judging means Control means for recognizing the oscillation and controlling the operation of the apparatus, and performing a control indication informing that the operation is shut down by the oscillation; and display means for operating by the control means to inform the shutdown of the oscillation to the outside. Oscillation detection control device of a repeater, characterized in that comprising a. 3. The oscillation detection control apparatus according to claim 2, wherein the control means sets an input reference time of a reset key for resetting the repeater when shutdown occurs due to oscillation.

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