KR100374024B1 - Test apparatus for of base station in mobile communication system by using multi-frequency assignment - Google Patents

Abstract

A base station test apparatus for measuring base station transmit / receive output at a base station of a mobile communication system includes a transmit / receive path switching unit connected to a transmit / receive antenna for each sector to switch a transmit / receive path, and a signal output from an intermediate frequency signal processing unit. Transmitting unit transmitting through the switching unit and the base station transmission signal through the transmission and reception path switching unit and down-converted the intermediate frequency and then transferred to the intermediate-frequency signal processing unit, single frequency allocation or multi-frequency allocation from the intermediate frequency down-converted signal A first receiver having a single frequency allocation coupling terminal and a multi-frequency allocation coupling terminal for detecting a signal, a second receiver having a base station receiver coupling terminal for receiving a base station reception signal through the transmission / reception path switching unit, and the single frequency allocation Coupling terminal, multi-frequency allocation An intermediate frequency path switching unit for outputting a signal transmitted to any one of a terminal or a base station coupling unit coupling terminal, a power measuring unit detecting a level of a signal transmitted through the intermediate frequency path switching unit, and the intermediate frequency path switching unit It consists of a high frequency spectrum monitoring assembly for sampling the signal transmitted through and then displaying it in the form of a high frequency spectrum.

Description

TEST APPARATUS FOR OF BASE STATION IN MOBILE COMMUNICATION SYSTEM BY USING MULTI-FREQUENCY ASSIGNMENT}

The present invention relates to an apparatus for testing a mobile communication base station in a mobile communication system, and more particularly, to an apparatus capable of remotely measuring transmission and reception power according to a single or multiple frequency allocation of a base station and monitoring a spectrum.

In general, a mobile communication system such as a code division multiple access communication system is composed of a plurality of base stations, mobile stations, and a base station manager. The base station is wirelessly connected to the mobile stations, and is wired to a public switched telephone network (hereinafter referred to as a PSTN) to enable communication between each mobile station and the PSTN. In order to facilitate communication between the mobile station and the PSTN, it is necessary to periodically monitor and diagnose whether an error has occurred or a failure has occurred in the base station.

The base station test apparatus was developed based on such a need. In other words, the base station test apparatus is a device having a function of monitoring and diagnosing an abnormality of a base station or a failure site. The base station test apparatus can be usefully used for a number of test functions for the base station. There is a transmission / reception output as a characteristic value that can uniquely identify the abnormality of the base station radio unit or the failure part of the base station. The base station radio is then tested by measuring the transmit and receive output.

1 is a view showing the configuration of a conventional base station transmit / receive output measuring apparatus.

The transmission path switching unit 100 is switched in response to the transmission path switching control signal input from the BCIU 300, so that the signal of the traveling wave coupling terminal (FWD) or the reflected wave coupling terminal (RFL) of the directional coupler (not shown) is transmitted. Select to transmit inward.

Receiving path switching units 110 and 120 are switched in response to the first and second receiving path switching control signals input from the BCIU 300, respectively, and transmit the input signals to a directional coupler (not shown). At this time, each path switching unit, if the base station is installed in the sector-cell each sector ( Has a path switching configuration. That is, when the base station is installed in the sector-cell, each of the switchers 101 to 103 of the transmission path switching unit 100 is divided into sectors ( Are connected between the directional couplers 104 and coupler 104, respectively.

Each switch 111 (113) of the first receiving path switching unit 110 (hereinafter referred to as RSWU) is a splitter 114 and each sector ( Are connected between the directional couplers, respectively. Each RSWU 121 to 123 of the second receiving path switching unit 120 includes a distributor 124 and each sector ( Are connected between the directional couplers, respectively. The distributors 114 and 124 may be four-way distributors.

Attenuator 200 attenuates the gain of the transmission signal of the base station radio unit received from the transmission path switching unit 100 in response to a transmission attenuation control signal applied from the BCIU 300 variable attenuator (variable attenuator) And a fixed attenuator 230 for fixed attenuation of the gain of the received radio signal RX by a predetermined gain to facilitate level connection of the radio signal, and from the BCIU 300. The variable attenuator 240 attenuates and outputs the output of the fixed attenuator 230 in response to the received attenuation control signal, and is connected between the variable attenuator 210 and the fixed attenuator 230 to transmit a radio signal of a transmission path. And a signal output from an output terminal of the test terminal 500 to be described later, a duplexer 220 to transmit or receive, and the variable attenuator 294. It is divided into a first and second receiving path switching unit (110, 120) consists of a divider (295) for outputting.

The base station transmit / receive subsystem control processor (hereinafter referred to as BCP) 400 collectively controls the overall operation of the base station transmit / receive measurement apparatus. Specifically, the transmission path switching control signal, the first and second reception path switching control signals, the transmission and reception attenuation control signal, the test control signal, and the like are output. The output control signals are applied to the transmission path switching unit 100, the reception path switching units 110 and 120, the variable attenuators 210 and 240, and the test terminal 500 to be described later, respectively. The configuration should be similar to the radio environment.

The base station transmit / receive subsystem control interface unit (hereinafter referred to as BCIU) 300 analyzes the input data and transmits the test result data to the upper processor (BCP) 400.

The test terminal 500 outputs a test call (test call: hereinafter referred to as a "test call") in response to a test control signal applied from the main controller 300, and stores data corresponding to the received signal. Output to the main control unit 300. The test terminal 500 may perform various monitoring, diagnostic and test functions for testing a base station, and is a portable cordless phone commonly used in general (e.g., a handy model of the type SCH-100 manufactured by Samsung Electronics). Phone) can be used.

The BPSU 600 generates and supplies power of various intensities required by each part of the base station transmit / receive output measuring apparatus.

As described above, only a single frequency allocation of the base station transmit / receive outputs can be measured. Therefore, in the case of multi-frequency allocation, it could be measured only by separately installing hardware capable of measuring the transmission and reception outputs and displaying them in a spectrum.

Accordingly, an object of the present invention is to provide a base station capable of diagnosing and maintaining a base station by remotely measuring a single or multiple frequency allocation transmission / reception output of a base station and monitoring a spectrum without a separate device for testing a wireless unit of a base station in a mobile communication system. In providing a test apparatus.

In order to achieve the above object, the present invention provides a device for measuring base station transmit / receive output in a base station of a mobile communication system including at least two antennas. A transfer unit for transmitting a signal to a base station through the transmission path switching unit, a reception unit for receiving a signal from the base station through the reception path switching unit, an intermediate frequency path switching unit, and a transmission through the intermediate frequency path switching unit; And a high frequency spectrum monitoring assembly for sampling the intermediate frequency signal and displaying the intermediate frequency signal in the form of a high frequency spectrum.

1 is a view showing the configuration of a conventional base station transmit / receive output measuring apparatus

2 is a diagram showing the configuration of a mobile communication system base station to which a base station test apparatus according to an embodiment of the present invention is applied;

FIG. 3 is a detailed view illustrating some components of a base station management and diagnostic assembly of FIG. 2.

4 is a detailed view of another configuration of the base station management and diagnostic assembly of FIG.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, numerous specific details such as components of specific circuits are shown, which are provided to help a more general understanding of the present invention, and it is understood that the present invention may be practiced without these specific details. It will be self-evident to those of ordinary knowledge. In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

2 is a diagram showing the configuration of a mobile communication system base station to which a base station test apparatus according to an embodiment of the present invention is applied.

The base station test apparatus includes two transmitters according to an orthogonal transmit diversity structure and two receivers according to a diversity structure. Transmission and reception measurement according to the present embodiment is described below Cell, Cell, A description will be given on the assumption that the present invention is applied to a base station divided into cells.

The base station test unit (BTU) is connected to the front end unit (FEU) 700 and 12 RF signal lines. 3 sectors ( In the system, the total number of antennas is 6, and each antenna is connected to the traveling wave coupling terminal (EQP) or the reflected wave coupling terminal (ANT) of the directional coupler, so that there are 12 lines.

The base station test apparatus (BTU) is connected to the base station system up / down conversion of the base station transmit / receive signal (up / down conversion), the base station transmission system management and diagnostic assembly (BTS Maintenance Diagonostic Assembly that functions as a transmission and reception path switching and test terminal) (Hereinafter referred to as BMDA) 800 and an RF Spectrum Monitering Assembly (hereinafter referred to as RSMA) 900 for displaying the RF spectrum. The RSMA 900 uses an analog-to-digital converter to sample the selected IF signal, and a resolution of 12 bits or more is required. An analog signal is continuously sampled, and the sampling data is temporarily stored in a first-in, first-out memory (not shown) (First In First Out memory (FIFO)), followed by a fast Fourier transform by a digital signal processor (DSP). (Fast Fourier Transform: FFT). The spectrum thus generated is transmitted to the BSM.

The BSM 750 may be implemented as a workstation computer in charge of performing a test, maintenance, maintenance, and management of a base station.

A personal computer (hereinafter referred to as a PC) 710 is connected to the RSMA 900 via RS-232C.

The PC MAP 720 is a base station local and is a personal computer that performs various roles such as testing, maintaining, maintaining, and maintaining a base station.

A base station transmit / receive subsystem control processor assembly (hereinafter referred to as BCPA) 730 is coupled to the BTU via Ethernet. The BCPA 730 is also connected to the maintenance PC 720 and the BSM 750 to control the base station transmit / receive subsystem.

A base station transmit / receive subsystem control and management assembly (hereinafter referred to as BCAA) 740 communicates data with BMDA 800 and RSMA 900 via Ala.

FIG. 3 is a diagram illustrating a detailed configuration of a part of BMDA in FIG. 2.

As shown in FIG. 3, the BMDA 800 of FIG. 2 includes transmission / reception path switching units 811 to 820 and 842 to 846, test terminals 821 to 841, and reception paths 847 to 853.

The transmission / reception path switching units 811 to 820 and 842 to 846 are switched in response to an input of a control signal applied from a BMDA (main control and digital interface unit included in the BMDA). As the switching, one of the signals of the traveling wave coupling terminals (EQPs) and the reflected wave coupling terminals (ANT) of the directional coupler 819 may be selected and transmitted.

As shown, in this embodiment, three sectors ( ) Is assumed to exist, so that path switching corresponding to each sector is possible.

The switch 811 for the first antenna has a traveling wave coupling terminal FEU / -A / EQP, FEU / -A / EQP, FEU / -A / EQP is connected and switching is possible. In addition, the switch 812 for the second antenna includes a traveling wave coupling terminal FEU / -B / EQP, FEU / -B / EQP, FEU / -B / EQP is connected and switching is possible. In addition, the switch 813 for the first antenna has a reflection coupling terminal FEU / -A / ANT, FEU / -A / ANT, FEU / -A / ANT is connected and transfer is possible. In addition, the switch 814 for the second antenna includes the echo coupling terminal FEU / -B / ANT, FEU / -B / ANT, FEU / -B / ANT is connected and transfer is possible. Here, the first antenna and the second antenna are divided into 'A' and 'B', respectively.

In addition, the switch 842 for the first antenna has a low noise amplifier FEU / -LNA0, FEU / -LNA0, FEU / -LNA0 is connected and switching is possible. In addition, the switch 843 for the second antenna has a low noise amplifier FEU / -LNA1, FEU / -LNA1, FEU / -LNA1 is connected and switching is possible.

The combiners 819 and 846 combine or separate signals output from the transmission / reception path switching units 811 to 820 and 842 to 846 or input to the transmission and reception path switching units 811 to 820 and 842 to 846.

The fixed attenuator 820 attenuates the base station output to facilitate level connection of the radio signal.

The test terminal units 821 to 841 include a transmitter unit, a receiver unit, a frequency synthesizer unit, an intermediate frequency (hereinafter, referred to as IF) terminal signal processor and a baseband signal processor {BBA (Base Band Analog), MSM (Mobile). Station Modem)}.

The duplexer 821 is connected to the fixed attenuators 820 of the transmission / reception path switching units 811 to 820 and 842 to 846, and separates radio signals of the transmission path. The base station transmission output passing through the duplexer 821 is converted into an IF signal by the mixer 834 through a low noise amplifier 832 and a band pass filter 833, and then amplified by the amplifier 835, and then a power divider 836. Is delivered to.

One signal output from the power divider 836 passes through a surface acoustic wave (SAW) filter 837 and is transmitted to the power divider 838. One signal output from the power divider 838 is transmitted to the gain amplifier 839, and the other signal is transmitted to the single frequency allocation coupling terminal TX_1X. The signal transmitted to the gain amplifier 839 is gain-adjusted within a range capable of analog / digital conversion and then transferred to an IF stage signal processor (not shown). The IF stage signal processor outputs the baseband digital signal as Q-channel data having a 90 ° phase difference from the I-channel signal by performing orthogonal conversion of the IF signal to analog / digital conversion. The baseband signal processor inputs the baseband quadrature digital signal output from the IF stage signal processor to perform digital demodulation, reproduces the digital voice signal using a vocoder, and transmits the digital voice signal to an external codec. The analog / digital converted analog voice is transmitted to the user through the speaker.

In addition, the other signal output from the power divider 836 passes through the band pass filter 840 and is then transmitted to the multi-frequency allocation coupling terminal TX_MC via the PAD 841.

The signal output from the IF stage signal processor is transferred to the gain amplifier 824 to be gain-controlled within the range of digital / analog conversion, and then passed through the SAW filter 825 and then converted into a baseband signal by the mixer 825. The band pass filter 827 is then converted into an analog form by the digital-to-analog converter 828. The signal converted into the analog form is transferred to the duplexer 821 via a band pass filter 829 and an isolator 830.

In addition, the signals output through the switch 842 and the switch 843 are combined in the combiner 846 and filtered by the band pass filter 848 via the low noise amplifier 847. The filtered signal is mixed with a specific oscillation frequency generated by the oscillator 849 in the mixer 850. This allows you to select (assign) any one of the 12 multiple frequencies. The signal of the selected frequency is amplified in amplifier 851. The amplified signal is filtered by low pass filter 852 and then amplified by amplifier 853. The amplified signal is transmitted to the base station receiver coupling terminal RX_1X.

4 is a view showing in detail the other part of the configuration of the BMDA in FIG.

IF path switching sections 861 to 864 are single frequency allocation coupling terminals TX_1X, multi-frequency allocation coupling terminals TX_MC or base stations in response to input of control signals applied from BMDAs (main control and digital interface units included in BMDA). One of the signals of the receiver coupling terminal RX_1X is selected.

The selected signal is delivered to power divider 867 via amplifier 865 and SAW filter 866. The signal distributed by the power divider 867 is delivered to each amplifier 868, 870. The signal passing through the amplifier 868 is transmitted via the PAD 869 as an intermediate frequency input RSMA_IF of RSMA. In addition, the signal passing through the amplifier 870 is transmitted to the detector 871. The signal output from the detector 871 is converted into a digital form (12 bits) by the analog / digital converter 872 and then transmitted to the BMDA.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by the equivalents of the claims.

As described above, the present invention includes a BMDA and a RSMA including a test terminal in a base station, and by using the same, by measuring the strength and spectrum of the multi-frequency allocation and single-frequency allocation transmission / reception signals of the base station, a base station is not required to be separately installed. There is an advantage that can accurately monitor and diagnose the presence of abnormalities, failure sites and the like.

Claims (7)

An apparatus for measuring a base station transmission and reception output at a base station of a mobile communication system, A transmission / reception path switching unit connected to a transmission / reception antenna for each sector to switch transmission / reception paths; A transmitter for transmitting a signal output from an intermediate frequency signal processor through the transmission / reception path switching unit; Receives the base station transmission signal through the transmission and reception path switching unit and down-converts the intermediate frequency and then transfers the signal to the intermediate-frequency signal processing unit, and combines a single frequency allocation for detecting single frequency allocation or multi-frequency allocation from the intermediate frequency down-converted signal. A first receiver having a terminal and a multi-frequency allocated coupling terminal; A second receiving unit having a base station receiving unit coupling terminal for receiving a base station receiving signal through the transmitting and receiving path switching unit; An intermediate frequency path switching unit for outputting a signal transmitted to any one of the single frequency allocation coupling terminal, the multi-frequency allocation coupling terminal, or the base station receiving unit coupling terminal; A power measuring unit detecting a level of a signal transmitted through the intermediate frequency path switching unit; And a high frequency spectrum monitoring assembly for sampling the signal transmitted through the intermediate frequency path switching unit and displaying the signal in the form of a high frequency spectrum. The method of claim 1, wherein the first receiver, A power divider for distributing the intermediate frequency signal, A first filter for filtering the divided signal and transferring the filtered signal to the single frequency allocation coupling terminal; And a second filter for filtering the other divided signal and transmitting the filtered signal to the multi-frequency allocation coupling terminal. The method of claim 2, And the first filter is a surface acoustic wave filter. The method of claim 2, And the second filter is a band pass filter. The method of claim 4, wherein And a first-in, first-out memory for temporarily storing the sampled data. The method of claim 5, And a digital signal processor for generating the high frequency spectrum by performing fast Fourier transform on the data read from the memory. The method of claim 2, wherein the first receiver, A low noise amplifier for low noise amplifying the received signal, A band pass filter for filtering a predetermined band of the low noise amplified signal; A mixer for generating an intermediate frequency signal by mixing a signal output from the band pass filter with a predetermined frequency; An amplifier for amplifying a predetermined frequency signal output from the mixer and transferring the predetermined frequency signal to the power divider; A second power divider for inputting a signal passed through the first filter and transferring a signal after a predetermined distribution to the single frequency allocation coupling terminal; A gain amplifier for adjusting the other signal output from the second power divider within a range capable of analog / digital conversion and transferring the signal to the intermediate frequency signal processor; And a fixed attenuator for attenuating the signal passing through the second filter and transmitting the attenuated signal to the multi-frequency allocation coupling terminal.