KR20120006205A - Isolation detection method between input and output of mobile communication repeater - Google Patents

Isolation detection method between input and output of mobile communication repeater Download PDF

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Publication number
KR20120006205A
KR20120006205A KR1020100066818A KR20100066818A KR20120006205A KR 20120006205 A KR20120006205 A KR 20120006205A KR 1020100066818 A KR1020100066818 A KR 1020100066818A KR 20100066818 A KR20100066818 A KR 20100066818A KR 20120006205 A KR20120006205 A KR 20120006205A
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KR
South Korea
Prior art keywords
repeater
oscillation
degree
output
mobile communication
Prior art date
Application number
KR1020100066818A
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Korean (ko)
Inventor
민형기
Original Assignee
(주)하이게인텔레콤
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Publication date
Application filed by (주)하이게인텔레콤 filed Critical (주)하이게인텔레콤
Priority to KR1020100066818A priority Critical patent/KR20120006205A/en
Publication of KR20120006205A publication Critical patent/KR20120006205A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/155—Ground-based stations
    • H04B7/15528—Control of operation parameters of a relay station to exploit the physical medium
    • H04B7/15535—Control of relay amplifier gain

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Relay Systems (AREA)

Abstract

PURPOSE: A transmitting and receiving separation sensing method of a mobile communication relay is provided to minimize oscillation phenomenon by controlling relay gain according to current transmitting and receiving separation degree. CONSTITUTION: A relay output waveform is analyzed through a spectrum analyzer in an oscillation state. An output voltage of a level sensing unit is converted according to the size of a sinusoidal wave. An output voltage value is getting larger if the size of the sinusoidal wave is larger. If the size of the sinusoidal wave is smaller, the output voltage value gets smaller. A relay gain is controlled by the measurement of degree of repeater transmission and reception separation.

Description

I / O detection method between input and output of mobile communication repeater.

The present invention is a method for detecting an oscillation that may occur in a mobile communication service using a small repeater and the current transmission and reception separation using this.

In general, the small repeater is a communication device that is installed in the shaded area where the signal of the base station is weak to facilitate the mobile communication service.

The separation degree of the transmitting and receiving antennas is changed by the installation environment conditions of the small repeater, which results in poor call quality and equipment damage. Therefore, by adjusting the repeater gain by sensing the transmission and reception separation degree, damage caused by oscillation can be minimized.

In the conventional small repeater, the repeater output and the gain are set to be controlled when the output signal reaches a certain limit level. In fact, when the output signal is transmitted below the limit level in the oscillation situation, the control does not operate in the repeater, thereby reducing the signal quality. In addition, when the separation between the base station direction antenna and the terminal direction antenna of the repeater is lower, the noise output signal due to oscillation is instantaneously sent out as high as the repeater maximum output (P1dB), which may cause damage to the base station and repeater. have.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object thereof is to detect a repeater transmission / reception degree, to control a gain of a repeater, to prevent a decrease in call quality, and to suppress an oscillation signal to prevent damage to a base station and a repeater. .

Means for detecting repeater oscillation, means for controlling the gain of the repeater, and means for storing the degree of oscillation according to transmit / receive isolation.

As described above, the present invention stores the oscillation degree according to the transmission and reception separation degree of the repeater in a table format to detect the oscillation phenomenon that may appear during the actual operation to measure the transmission and reception separation degree, and adjust the repeater gain according to the current transmission and reception separation value oscillation Minimize the phenomenon to minimize call quality degradation and equipment damage.

1 is a block diagram showing a relay system including a phase adjuster and a signal level detector according to the present invention.
2 is a diagram showing the amplitude and phase change of the noise level due to oscillation according to the degree of oscillation.
3 is a test configuration diagram for preparing a voltage table according to the degree of oscillation.

1 shows a simplified block diagram of a repeater in connection with the present invention. Referring to the general operation of Figure 1, the transmission path is input to the duplexer (11-1) and the base station signal that is partially filtered is amplified through the front end amplifier (13-1) and after passing through the attenuator (12-1) Through the frequency conversion and the filter unit 14-1, the filter is filtered to the actual use band. The filtered signal is amplified into a large signal through the rear end amplifier and passed through the duplexer 11-2 to be spatially radiated to the antenna. The reception path is a terminal signal received through the antenna in the same way as the transmission path is a duplexer (11-2), the front end amplifier (13-2), attenuator (12-2) frequency conversion and filter unit (14-2), After passing through the phase adjuster 17, the rear end amplifier 15-2, the duplexer 11-1 is radiated to the antenna. The control unit 16 functions as a table control function according to repeater control, status monitoring and oscillation degree.

In the state where oscillation occurs, the repeater output waveform shows the sine wave shape characteristics as shown in FIG. 2. The magnitude of the sinusoidal wave increases as the oscillation increases, and the magnitude of the sinusoidal wave becomes smaller as the oscillation decreases. The output voltage of the level detector 18 changes according to the magnitude of the sinusoidal wave. As the size of the sine wave increases, the value of the output voltage also increases. As the size of the sine wave decreases, the value of the output voltage decreases.

The present invention is to detect the degree of oscillation using the above phenomenon to measure the repeater transmission and reception separation degree to adjust the repeater gain to prevent the occurrence of oscillation as follows.

2 shows a sine wave shape of a noise waveform due to oscillation. The amplitude increases according to the degree of oscillation, and the level sensor 18 of FIG. 1 sends a voltage value according to the degree of oscillation to the controller. 3 is a configuration diagram for preparing a voltage table according to the degree of oscillation, and includes a repeater 20 and a step attenuator 21 that can be changed by one decibel. The attenuator 21 sets the attenuation value of the step attenuator 21 15 decibels higher than the repeater gain in the state configured as shown in FIG. In this state, while reducing the attenuation value of the step attenuator 21 by one decibel, the output voltage value of the level sensing unit 18 according to the oscillation degree is stored in the controller 16. Since the attenuation value of the step attenuator 21 becomes the transmit / receive isolation value of the repeater, the repeater transmit / receive separation according to the voltage value of the level detector 18 can be confirmed.

11-1, 11-2: duplexer
12-1.12-2 ,: Attenuator
13-1, 13-2: shear amplifier
14-1, 14-2: frequency conversion and filter section
15-1, 15-2: rear amplifier
16: control unit
17: phase adjuster
18: level detection unit
20: repeater
21: stage attenuator

Claims (1)

Means for detecting the transmission and reception separation of the repeater using the oscillation detection.
KR1020100066818A 2010-07-12 2010-07-12 Isolation detection method between input and output of mobile communication repeater KR20120006205A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020100066818A KR20120006205A (en) 2010-07-12 2010-07-12 Isolation detection method between input and output of mobile communication repeater

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020100066818A KR20120006205A (en) 2010-07-12 2010-07-12 Isolation detection method between input and output of mobile communication repeater

Publications (1)

Publication Number Publication Date
KR20120006205A true KR20120006205A (en) 2012-01-18

Family

ID=45611993

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020100066818A KR20120006205A (en) 2010-07-12 2010-07-12 Isolation detection method between input and output of mobile communication repeater

Country Status (1)

Country Link
KR (1) KR20120006205A (en)

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