KR101190551B1 - Automatic diagnosis device of breakdown part in the mobile station - Google Patents

Abstract

PURPOSE: An automatic diagnosis apparatus of a fourth generation mobile communication LTE relay and an automatic diagnosis method are provided to accurately determine a failure part and to perform maintenance and repair of the failure part. CONSTITUTION: A first converter(108) removes an adjacent band signal from an RF(Radio Frequency) signal which a filter(102) outputs. A power amplifier(110) amplifies the output of the outputted RF signal. A LNA(Low Noise Amplifier)(112) amplifiers the strength of the RF signal. A second converter(114) removes the adjacent band signal from the RF signal. A plurality of couplers(118) divides a comparison target signal outputted from each configuration element. [Reference numerals] (102) Filter; (104) Power supplier; (106) CPU; (108) First converter; (110) Power amplifier; (112) Low filter amplifier; (114) Second converter; (116) Automatic diagnosis device

Description

AUTOMATIC DIAGNOSIS DEVICE OF BREAKDOWN PART IN THE MOBILE STATION}

The present invention relates to a failure point automatic diagnosis device and an automatic diagnosis method of the fourth generation mobile communication LTE repeater, and more particularly, whether each module included in the repeater for transmitting a communication signal of the mobile communication system automatically The present invention relates to an automatic diagnosis device and an automatic diagnosis method of a failure part of a fourth generation mobile communication LTE repeater, which can be transmitted to an administrator.

In general, a mobile communication system is a communication system that targets mobile devices such as people, cars, ships, trains, and airplanes, which includes key phone systems, mobile phones (mobile phones, vehicle phones), port phones, aircraft phones, and mobile phones. Trains, cruise ships, express buses), radio calling, radiotelephony, satellite mobile communication, amateur radio, and fishing service ships.

The repeater is used in such a mobile communication system, and connects a base station and a wireless terminal (or lower repeater). The repeater and the lower repeater play a role of relaying a mobile communication signal to a shaded area caused by a problem such as a location of a base station or a terrain.

1 is a conceptual diagram showing the configuration of a mobile communication relay system, Figure 2 is a block diagram showing the components of a repeater according to the prior art.

The mobile telecommunication company 11 and the base station 12 are generally connected by wire to send and receive communication signals. The communication signal transmitted from the base station 12 is wirelessly received through the antenna 13 of the repeater 14 and connected to the terminal 15 of the terminal subscriber to enable voice communication or data communication.

The base station 12 is connected to the repeater 14 to perform a handoff function so that the mobile communication service can be maintained continuously.

Inside the repeater 14, filters 14-1 for removing noise by filtering RF signals transmitted from the base station 12 or from the terminal 15 are installed at the beginning and the end of the communication path.

The repeater 14 is provided with a power supply unit 14-2 for supplying power used for generating and amplifying a signal and for operating a control unit, and a CPU 14-3 for calculating and controlling a signal.

The RF signal transmitted from the base station 12 is input to the first converter 14-4 through the filter 14-1, and the adjacent band signal is removed from the first converter 14-4 and out of band. band) is converted into an intermediate frequency (IF) signal to secure the standard, and then converted into an RF signal, and the signal strength is amplified by the power amplifier 14-5 through the filter 14-1 at the outlet side. It is delivered to the terminal 15.

After the RF signal input from the opposite direction, that is, the terminal 15 passes through the filter 14-1, the signal strength is increased while minimizing noise in the low noise amplifier (LNA) 14-6. In order to remove the adjacent band signal and secure the out-of-band specification in the second converter 14-7, the second converter 14-7 is converted into an intermediate frequency (IF) signal. do.

However, when any one of the components included in the repeater 14 fails or does not operate normally, an error may occur in the signal passing through the repeater 14 as a whole. When an error or a failure occurs in the repeater 14, the manager is dispatched to the field to check the state of the repeater 14, and after identifying the part of the failure occurs, repairs or replaces the module and repairs it.

In general, the repeater 14 is often installed in a place that is not easily accessible to personnel, such as tunnels, mountainous areas, building roofs, etc., the manager has a malfunction of the repeater 14, and after the operation is identified, the failure site is returned Take the replacement part for the module and go back to the site for repair. In addition to such a waste of human and time, there are problems such as poor communication quality that cannot provide high quality communication service.

In addition, even if the manager is dispatched to the field, it is difficult to pinpoint exactly which part has failed, which may lead to a wrong diagnosis and thus delay the normalization of the communication service.

According to the present invention for solving the above problems, by installing the coupler between the modules constituting the repeater, and branching the signal passing through the coupler to compare with the normal output and quality, it is possible to quickly determine where the failure occurred. It is an object of the present invention to provide an automatic diagnosis device and an automatic diagnosis method of a failure part of a fourth generation mobile communication LTE repeater.

The present invention devised to solve the above problems is installed in the repeater 100 used in the mobile communication system as a device for automatically grasp whether the repeater 100 has a failure and the failure part, the repeater 100 Is a filter 102 for receiving an RF signal transmitted from the base station 12 or transmitting an RF signal to the base station 12, and a first band removing the adjacent band signal from the RF signal output from the filter 102 and outputting the first band signal. The converter 108, the power amplifier 110 to amplify the output of the RF signal output from the first converter 108, and the strength of the RF signal transmitted from the terminal 15 through the filter 102 The low noise amplifier 112 to amplify, and the second converter 114 to remove the adjacent band signal from the RF signal output by the low noise amplifier 112 to the filter 102, the repeater 100 is The filter 102, the first converter 108, the power amplifier (110), the low noise amplifier 112, and a plurality of couplers 118 for branching the comparison target signal output from the second converter 114, respectively, and the comparison target signal branched by the coupler 118 Calculate any one or more of EVM (Error Vector Magnitude), Signal Strength, SNR (Signal-to-Noise Ratio), ACRL (Adjacent Channel Leakage Ratio), and compare EVM, Signal Strength, SNR and ACRL of the original signal. It is characterized by determining whether there is an abnormal signal.

The original signal is a signal that is output in the normal state of the first converter 108, the power amplifier 110, the low noise amplifier 112, the second converter 114, the automatic diagnostic device 116 Data for the characteristic value of the original signal is stored, and the characteristic value of the original signal is compared with the characteristic value of the comparison target signal.

The automatic diagnosis device 116 is characterized in that for transmitting a report signal for the failure of the components included in the repeater 100 to the CPU (106).

According to another exemplary embodiment of the present invention, an automatic diagnosis method using a failure point automatic diagnosis device includes a filter 102, a first converter 108, a power amplifier 110, and a low noise amplifier 112 included in a repeater 100. And branching the comparison target signal output from the second converter 114 through the coupler 118 to input the automatic diagnosis device 116; Receiving the comparison target signal branched by the coupler 118, and the automatic diagnosis device 116 calculating one or more of EVM, signal strength, SNR, and ACRL of the comparison target signal; The automatic diagnosis device 116 is an EVM of an original signal which is a signal output from the first converter 108, the power amplifier 110, the low noise amplifier 112, and the second converter 114 in a normal state, Comparing at least one of signal strength, SNR, and ACRL with the EVM, signal strength, SNR, and ACRL of the comparison target signal; And a result of the comparison between the original signal and the comparison target signal, the automatic diagnosis device 116 transmitting a report signal to the CPU 106 as to whether a component included in the repeater 100 has failed. .

According to the present invention can quickly determine whether the repeater installed in the mountains or the top of the building, remote areas can be quickly identified from the remote location, it is effective to determine exactly where the failure occurred in a quick maintenance.

In addition, according to the present invention, it is possible to grasp the failure state to be dispatched to the site with only the replacement parts of the failure portion, there is an effect that can reduce the waste of manpower and time.

1 is a conceptual diagram showing the configuration of a mobile communication relay system.
Figure 2 is a block diagram showing the components of the repeater according to the prior art.
3 is a block diagram showing components of a repeater according to an embodiment of the present invention.
Figure 4 is a block diagram showing the internal components of the automatic diagnostic device shown in FIG.
5 is a block diagram showing a signal comparison process of the FPGA.

Hereinafter, with reference to the drawings will be described "automatic diagnostic device and automatic diagnosis method of the failure part of the fourth generation mobile communication LTE repeater" according to an embodiment of the present invention.

Figure 3 is a block diagram showing the components of the repeater according to an embodiment of the present invention, Figure 4 is a block diagram showing the internal components of the automatic diagnostic apparatus shown in Figure 3, Figure 5 is a signal comparison process of the FPGA A block diagram is shown.

The automatic diagnostic device 116 of the present invention is installed inside the repeater 100. In the repeater 100, the filters 102-1 and 102-2, the power supply 104, the CPU 106, the first converter 108, the power amplifier 110, and the low noise amplifier as described in the related art. 112, the second converter 114, and the like. Their operation and function are the same as in the prior art.

And the repeater 100 is installed with an automatic diagnostic device 116 to find the position of the abnormal operation of each component. To this end, a coupler 118 for branching a part of the communication signal is installed in the signal movement path inside the repeater 100. Coupler 118 is connected to the automatic diagnostic device 116 transmits a portion of the communication signal between the components coming and going to the automatic diagnostic device 116. The automatic diagnosis device 116 receives the communication signals from the couplers 118, analyzes the signal strength and quality, and finds a place where a signal that does not meet the criteria is detected to determine whether there is a failure. The automatic diagnosis device 116 transmits a report signal indicating whether a component has failed to the CPU 106.

The coupler 118 includes filters 102-1 and 102-2, a power supply 104, a CPU 106, a first converter 108, a power amplifier 110, a low noise amplifier 112, a second converter ( 114) are installed between the components.

The automatic diagnosis device 116 receives a signal branched from the coupler 118, converts a frequency into a digital signal, and analyzes an EVM (Error Vector Magnitude), a signal strength, and an SNR (Signal-to-Noise Ratio).

Referring to Figure 4 will be described the components of the automatic diagnostic device 116.

The up / down converter 116-1 converts the RF signal branched from the coupler 116 into an IF signal of intermediate frequency.

The A / D converter 116-2 converts an analog signal IF signal into a digital signal and inputs it to the FPGA 116-3, or converts a digital signal input from the FPGA 116-3 into an analog IF signal.

The FPGA 116-3 analyzes the digital signal to determine whether the signal is in error.

The clock signal synthesizing unit 116-5 transfers the synchronization clock signal transmitted from the clock signal generating unit 120 installed in the repeater 100 to the up / down converter 116-1 and the FPGA 116-3. Allow synchronization of signals.

The error of the signal analyzed by the FPGA 116-3 is stored in the RAM 116-4 and transmitted to the CPU 106. The CPU 106 determines whether the repeater 100 is broken based on the analyzed signal state, and generates and stores information about the location of the broken part, or delivers the information to the manager through a network. Since the manager who has received the failure notification of the repeater 100 can determine which part has occurred in a remote location, the manager can be dispatched with only the equipment necessary for replacement or repair to repair the failure at once.

5 shows a signal comparison process of the FPGA 116-3.

The FPGA 116-3 calculates the EVM, frequency stability, ACLR, etc. of the comparison target signal actually inputted from each coupler 118 and the original signal under normal conditions to determine whether a difference between the two signals has occurred. The method determines whether the device has failed.

The original signal is a signal that is output when the amplifier or converter is assumed to be in a normal state, and the automatic diagnosis device 116 should have data on characteristic values of the original signal.

The signal to be compared is a signal which is branched from each coupler 118 and input to the automatic diagnosis device 116 during the operation of the actual repeater 100. The signal whose characteristic value is changed by the normal or abnormal operation of the converter or the amplifier is used. it means.

The automatic diagnosis device 116 may determine whether each component is faulty by comparing the difference between the characteristic values of the original signal in the ideal state and the comparison signal in the actual operating state.

The digital signal (comparative object signal) input to the FPGA 116-3 includes a baseband signal including an in-phase (I) signal and a quadrature-phase (Q) signal in a digital down converter inside the FPGA 116-3. Converted to (Baseband Frequency Signal).

The FPGA 116-3 stores the input comparison target signal in a memory. The size of the data stored in the memory can be determined according to the situation of the communication device. In general, since the frame period of the LTE signal is 10 ms, the data of 20 ms is stored to store one complete frame without knowing the frame start point. It is desirable to.

When the storage is completed, the DSP (Digital Signal Processor) included in the FPGA 116-3 finds a synchronization signal in the received signal (compare target signal) and synchronizes the frame. In the downlink, the synchronization signal uses a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), and the uplink uses a demodulation reference signal (DRMS).

Next, each offset of time, frequency, and phase is estimated from the received signal and compensated.

The Orthogonal Frequency Division Multiplex (OFDM) symbol is decoded in the signal frame to generate reference data. The reference signal is generated by encoding the generated reference data, and the EVM is calculated by comparing the received signal with the generated reference signal.

The baseband signal is measured and stored according to the Quadrature Amplitude Modulation (QAM) Constellation (LTE) measurement during the EVM measurement.

The input baseband signal is swept to a frequency band to be measured to measure and store a power difference of a reference offset frequency of an adjacent channel.

The FPGA 116-3 calculates an ACRL (Adjacent Channel Leakage Ratio) of the power difference between the EVM and the offset frequency through a fast fourier transform (FFT) method.

Through the ACRL calculated in this manner, it is possible to determine the difference between the original signal and the comparison target signal, and it may be determined that a failure occurs in the portion where the signal difference occurs.

If the characteristic value of the comparison target signal branched from the coupler 118 connected to the output side of the first converter 108 is different from the normal signal characteristic value by more than a certain degree, It may be regarded that an abnormality occurs in the operation of the first converter 108. Likewise, when the comparison target signal branched from the coupler 118 connected to the output side of the low noise amplifier 116 has an error compared to the original signal, the low noise amplifier 116 may be regarded as a failure.

In general, a method of determining whether an abnormality of a corresponding module is determined by analyzing a comparison target signal branched from a coupler 118 connected to an output side of a specific module and comparing it with an original signal expected in a normal state. You could also actually split the signal on the output side and compare the two actual signals.

Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the above-described technical configuration of the present invention may be embodied by those skilled in the art to which the present invention pertains without changing its technical spirit or essential features of the present invention. It will be appreciated that the present invention may be practiced as. Therefore, the above-described embodiments are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the appended claims rather than the detailed description, and the meaning and scope of the claims and All changes or modifications derived from the equivalent concept should be interpreted as being included in the scope of the present invention.

11: mobile carrier 12: base station
13: antenna 14, 100: repeater
15: terminal 102: filter
104: power supply 106: CPU
108: first converter 110: power amplifier
112: low noise amplifier 114: the second converter
116: automatic diagnostic device 118: coupler
120: clock signal generator

Claims (4)

As an automatic diagnosis device 116 is installed inside the repeater 100 used in the mobile communication system to automatically determine whether the repeater 100 is broken and the broken portion,
The repeater 100
A filter 102 for receiving an RF signal transmitted from the base station 12 or transmitting an RF signal to the base station 12, and a first converter for removing and outputting an adjacent band signal from the RF signal output by the filter 102. And a power amplifier 110 for amplifying the output of the RF signal output from the first converter 108 and amplifying the strength of the RF signal transmitted from the terminal 15 and input through the filter 102. A low noise amplifier 112, a second converter 114 which removes an adjacent band signal from the RF signal output by the low noise amplifier 112, and outputs it to the filter 102, the filter 102 and the first And a plurality of couplers 118 for branching the comparison target signal output from the converter 108, the power amplifier 110, the low noise amplifier 112, and the second converter 114,
The automatic diagnostic device 116 is
An up / down converter 116-1 for converting the comparison target signal branched from the coupler 118 into an IF signal of an intermediate frequency;
An A / D converter (116-2) for converting the IF signal output from the up / down converter (116-1) into a digital signal;
An FPGA (116-3) for analyzing the digital signal to determine whether the signal is in error;
A RAM 116-4 that temporarily stores information on whether an error of the signal analyzed by the FPGA 116-3 is detected;
A clock signal synthesizing unit (116-5) for transmitting the synchronization clock signal transmitted from the clock signal generating unit (120) installed in the repeater (100) to the FPGA (116-3) and the RAM (116-4); Including;
The FPGA 116-3
Calculating any one or more of an error vector magnitude (EVM), a signal strength, a signal-to-noise ratio (SNR), and an Adjacent Channel Leakage Ratio (ACRL) of the comparison target signal;
The first converter 108, the power amplifier 110, the low noise amplifier 112, the second converter 114 is a signal output in the normal state, the EVM of the original signal, the signal strength, SNR, ACRL Compare and determine the abnormality of the signal,
While storing the data of the characteristic value of the original signal, and compares the characteristic value of the original signal and the characteristic value of the comparison target signal to report a report signal for the failure of the component included in the repeater 100 Auto-diagnostics of the failure site of the fourth generation mobile communication LTE repeater, characterized in that the transmission to (106). delete delete An automatic diagnosis method using the failure diagnosis automatic diagnosis device of claim 1,
The comparison target signal output from the filter 102, the first converter 108, the power amplifier 110, the low noise amplifier 112, and the second converter 114 included in the repeater 100 through the coupler 118. Branching each one to input the automatic diagnosis device 116;
Receiving the comparison target signal branched by the coupler 118, and the automatic diagnosis device 116 calculating one or more of EVM, signal strength, SNR, and ACRL of the comparison target signal;
The automatic diagnosis device 116 is an EVM of an original signal which is a signal output from the first converter 108, the power amplifier 110, the low noise amplifier 112, and the second converter 114 in a normal state, Comparing at least one of signal strength, SNR, and ACRL with the EVM, signal strength, SNR, and ACRL of the comparison target signal;
A result of the comparison between the original signal and the comparison target signal, and the automatic diagnosis device 116 transmitting a report signal to the CPU 106 as to whether a component included in the repeater 100 has failed; , Automatic diagnosis of faults in the 4th generation mobile communication LTE repeater.

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