KR20090041282A - Apparatus and method for measuring reception sensitivity of base station by using repeater - Google Patents

Abstract

An apparatus and a method for measuring the receive sensitivity of a base transceiver station on a real time basis by using a relay are provided to measure reception sensitivity of a mobile base station by analyzing the spectrum of reverse output signal of the master unit. A call test is requested to a testing terminal which is built in a slave unit(S11). ACK for the house probe response is transmitted(S12). A microprocessor sets up the reverse path(S13). The testing terminal maintains the call connection(S14). The receive sensitivity of pathway is measured(S15). It determines whether to generate error on a relevant path(S16). The measurement of the relevant pathway is finished(S18). It determines whether the measurement path is a first path(S19). If the measurement path is the second path, it examines the state of the testing terminal according to the reliability test(S21).

Description

Apparatus and method for measuring reception sensitivity of mobile communication base station {APPARATUS AND METHOD FOR MEASURING RECEPTION SENSITIVITY OF BASE STATION BY USING REPEATER}

The present invention relates to an apparatus and method for measuring a reception sensitivity of a mobile communication base station, and more particularly, to an apparatus and method for measuring a reception sensitivity of a mobile communication base station in real time using a repeater.

In general, a mobile communication system is composed of a base station, a base station controller, a mobile station (mobile terminal) and the like.

The base station and the mobile station communicate in a constant frequency band, and each base station has a constant call radius. Therefore, it is necessary to appropriately arrange a plurality of base stations so that the callable area of each base station overlaps each other, thereby making the callable area wider.

However, even if a large number of base stations are arranged to cover the entire city, call shadowing areas, which are still impossible to call, may occur in underground spaces of large buildings and inside of high-rise buildings. In order to solve the problem that the call shadow area occurs, a plurality of repeaters are separately installed in the shadow area to provide a smooth call service.

1 is a schematic configuration diagram of a mobile communication system using an optical repeater.

The mobile communication system includes a base station 10, an optical repeater 20, and a mobile terminal 30, and the optical repeater 20 includes a master unit 21 and a slave unit 23.

The base station 10 generates a transmitted RF signal, couples the transmitted RF signal through the coupler 11 in the master unit 21 of the optical repeater 20, and processes the received RF signal transmitted from the master unit 21.

The optical repeater 20 is composed of a master unit 21 for the transmission / reception signal link with the base station 10 and a slave unit 23 for the transmission / reception signal link with the mobile terminal 30. . The master unit 21 and the slave unit 23 are connected via an optical cable 25.

However, when the repeater is expanded to expand the service coverage of the mobile communication base station and reduce the shadow area, the received signal of the base station increases due to the reverse gain of the extended repeater. In this case, when the mobile terminal within the service coverage of the base station accesses the base station, mutual interference with various signals flowing into the base station occurs, and at this time, the level of the received signal of the mobile communication system is increased by various introduced signals, thereby increasing the channel capacity of the base station. This reduces and reduces service coverage.

Therefore, it is necessary to check whether each system on the transmission and reception paths of the mobile communication system is operating properly and measure the reception sensitivity of the base station.

2 is a block diagram illustrating a method of measuring a reception sensitivity of a mobile communication base station according to the prior art.

The base station 10 amplifies the forward signal (transmitting RF signal) through the high output amplifier 11 in the forward link and then transmits the antenna 13 through the BPF 12 and the antenna 13 in the reverse link. The amplified reverse signal (received RF signal) received through the BPF 15 is amplified to a predetermined level through the low noise amplifier 14.

The test terminal 51 has a unique subscriber number, is mounted in the electromagnetic shielding case 50, and is connected through a cable and a directional coupler 56 at a high frequency radio end portion of the base station 10.

At this time, the forward signal branched through the directional coupler 56 is transmitted to the attenuator 53, the forward signal attenuated through the attenuator 53 is transmitted to the test terminal 51 through the coupler (52). In addition, the output (reverse signal) of the test terminal 51 is branched through the coupler 52 and passed to the spectrum analyzer 55 for power measurement through the attenuator 54, and by analyzing the signal level, the base station ( The reception characteristic at the receiving end of 10) is measured.

That is, the attenuation level from the test terminal 51 through the attenuator 53 and the directional coupler 56 to the receiving input terminal of the base station 10 and the attenuation level from the test terminal 51 to the spectrum analyzer 55 are measured. Since the signal level of the test terminal 51 is measured using the spectrum analyzer 55, the magnitude of the received signal level of the input terminal received by the base station 10 through the directional coupler 56 can be indirectly known. have.

However, according to the conventional method for measuring the reception sensitivity of a mobile communication base station, it is impossible to detect in real time when the expansion of the repeater and other abnormal signs occur, and to verify which of the repeaters caused a problem when a failure such as abnormal reception sensitivity of the base station occurs. In order to check the reception state of the base station while controlling the repeaters in service one by one, in this case, the mobile communication service may be disconnected due to the repeater check.

In addition, due to the deterioration of the repeaters connected to the base station, the reverse signal level of the base station is increased even when the repeater is not expanded. At this time, the service radius of all the base stations is reduced, and a problem occurs only when the state of all the repeaters connected to the base station is checked. There is a problem that the position and location of the repeater can be confirmed.

Therefore, the conventional method of measuring the reception sensitivity by connecting the high-frequency radio end portion of the base station through the directional coupler as described above, it is possible to determine only the extent to which the base station service coverage deterioration occurs due to the expansion and deterioration of the repeater. And there is a problem that can not grasp the repeater.

One embodiment of the present invention is derived to solve the above-described problems of the prior art, a mobile communication that can measure the reception sensitivity of the mobile communication base station in real time by analyzing the spectrum of the reverse output signal of the master unit of the optical repeater Provided are a reception sensitivity measuring apparatus and a measuring method of a base station.

As a technical means for achieving the above object, the first aspect of the present invention is a base station using a repeater including a master unit connected to the base station and a slave unit connected to the master unit via an optical cable and RF communication with the mobile terminal A method of measuring a reception sensitivity, the method comprising: (a) requesting a call test to a test terminal built into the slave unit, and (b) coupling a power controlled reverse signal from the test terminal to a reverse output terminal of the master unit; And (c) analyzing a spectrum of the coupled reverse signal to measure a reception sensitivity of the base station.

A second aspect of the present invention is a receiving unit of the base station receiving sensitivity measuring apparatus using a repeater comprising a master unit connected to the base station and a slave unit connected to the master unit via an optical cable and RF communication with the mobile terminal, An attenuator connected to the output of the antenna for attenuating the signal received from the base station; a test terminal for transmitting a power controlled signal in accordance with the strength of the attenuated signal embedded in the slave unit; and a reverse output of the master unit. And a spectrum module for analyzing a spectrum of a signal received from the test terminal and measuring a reception sensitivity of the base station.

According to one of the problem solving means of the present invention described above, by using a repeater capable of measuring the state of the mobile communication system and the reception sensitivity of the mobile communication base station in real time by analyzing the spectrum of the reverse output of the master unit of the optical repeater A reception sensitivity measuring apparatus and a measuring method of a communication base station can be provided.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless specifically stated otherwise.

Hereinafter, a method of measuring reception sensitivity of a mobile communication base station using an optical repeater according to an embodiment of the present invention will be described with reference to FIG. 3. 3 is a view for explaining a method for measuring a reception sensitivity of a mobile communication base station using an optical repeater according to an embodiment of the present invention.

The base station 100 amplifies a forward signal (transmitting RF signal) through the high power amplifier 110 in the forward link and transmits it through the transmit antenna 120, and receives the received signals through the receive antennas 140 and 160 in the reverse link. The reverse signal (received RF signal) is amplified to a predetermined level through the low noise amplifiers 130 and 175.

The master unit 200 of the optical repeater transmits the forward signal received from the base station 100 to the forward RF module 220, and transmits the forward RF signal transmitted through the forward RF module 220 in the optical module 250. The signal is converted into a signal and transmitted to the slave unit 300 through an optical cable.

In addition, after the master unit 200 converts the optical signal received from the slave unit 300 through the optical cable to the reverse signal through the optical module 250, the main signal to the reverse main RF module 230, diver The city signal is forwarded to the reverse diversity RF module 240, respectively. The main signal and the diversity signal passing through the reverse main RF module 230 and the reverse diversity RF module 240 are transmitted to the base station 100.

The slave unit 300 of the optical repeater converts the optical signal received from the master unit 200 to the forward RF signal through the optical module 310 to the high output amplifier 320, and amplified by the high output amplifier 320 The forward signal is transmitted to the mobile terminal (not shown) via the antenna 360 via the BPF 350.

In addition, the slave unit 300 separates the reverse signal received from the mobile terminal (not shown) through the antenna 360 with the forward signal through the BPF 350, and then separates the main signal and the diversity signal into a low noise amplifier. To 330 and 340, respectively. Each reverse signal amplified by the low noise amplifiers 330 and 340 is converted into an optical signal through the optical module 310 and transmitted to the master unit 200 through the optical cable.

In the above-described configuration, the input terminal of the low noise amplifiers 130 and 150 of the base station 100 and the reverse direction of the optical repeater master unit 200 using the couplers 260 and 270 to measure the reception sensitivity of the receiver of the base station 100. Connect the output terminal. In addition, the reverse output terminal of the optical repeater master unit 200 is connected to the spectrum module 280 using the coupler (260, 270).

By such a configuration, when the signals input to the couplers 260 and 270 are analyzed through the spectrum module 280, since it is possible to calculate the loss of the wired state from the optical repeater to the base station 100, the base station 100 ), The sensitivity of reception can be measured.

At this time, the reception sensitivity of the reverse output terminal of the master unit 200 of the optical repeater is measured using the transmission RF signal of the test terminal 390 built in the slave unit 300.

The slave unit 300 couples the forward signal of the base station 100 through the coupler 370 and transmits the forward signal to the attenuator 380.

The attenuator 380 transmits the forward signal to the test terminal 390 by the test terminal 390 attenuating the reception level of the base station system.

The test terminal 390 controls and transmits power of a transmission signal according to the reception level of the signal received from the attenuator 380. In this case, the test terminal 390 receives the signal of the reception level received from the attenuator 380. The transmission power is determined according to the size of the signal and the signal is transmitted.

The test terminal 390 receives a data request from the base station 100 or receives a call connection request or a data transmission request from a test server terminal (not shown) to a test server terminal (not shown) using a data transmission channel. The data is transmitted, and the data received by the test server terminal analyzes data errors and the like by an analysis computer (not shown) connected to the test server terminal. Through this process, it is possible to monitor the state of the mobile communication system network by measuring the characteristics of the test terminal 390, data transmission failure rate analysis and the bit error rate (BER) using the received data.

The reverse signal output from the test terminal 390 is transmitted to the low noise amplifiers 330 and 340 of the slave unit 300 through the coupler 370 and amplified and then transmitted to the master unit 200 through an optical cable.

The master unit 200 receives the reverse signal transmitted from the slave unit 300 and transmits the reverse signal to the base station 100 through the reverse main RF module 230 and the reverse diversity RF module 240.

In this case, by receiving the signals of the reverse output terminal of the master unit 200 through the coupler (260, 270) and applied to the spectrum module 280, the reception sensitivity of the base station 100 can be measured.

4 is a block diagram of a spectrum module for analyzing signals of the reverse output terminal of the master unit according to an embodiment of the present invention.

Spectrum module 280 includes RF switch 281, attenuator 282, mixer 283, SAW filter 284, A / D converter 285, PLL module 286 and microprocessor 287. .

In order to measure the signal sensitivity of the reverse output terminal of the master unit 200, couplers 260 and 270 are connected to the output terminals of the reverse main RF module 230 and the reverse diversity RF module 240 to couple the reverse signal.

The RF switch 281 selects one of a main signal and a diversity signal applied through the couplers 260 and 270 and transmits the selected one to the attenuator 282. At this time, the path to be measured is controlled by the microprocessor 287.

When the main signal is selected by the microprocessor 287, the attenuator 282 attenuates and transmits the main signal transmitted from the RF switch 281 to the mixer 283.

The mixer 283 converts the main signal attenuated by the attenuator 282 into an intermediate frequency signal (hereinafter, referred to as an IF signal) that can be measured.

The PLL module 286 scans all frequency bands of the IF signal converted by the mixer 283 and collects necessary data.

The SAW filter 284 filters the unnecessary band signal of the converted IF signal and transmits the signal to the A / D converter 285.

The A / D converter 285 receives the filtered IF signal from the SAW filter 284, converts it to a digital signal, and delivers it to the microprocessor 287.

The microprocessor 287 analyzes the IF signal received from the A / D converter 285 to collect data. The collected data is connected to the digital board of the master unit 200 of the optical repeater and used to perform higher level reporting and monitoring functions.

When the measurement of the main signal is completed, the microprocessor 287 controls the RF switch 281 to measure the diversity signal, and performs the same function as described above.

5 is a flowchart illustrating a method of measuring a reception sensitivity of a mobile communication base station using an optical repeater according to an embodiment of the present invention.

Referring to FIG. 5, in step S11, when the test server terminal requests measurement or starts automatic measurement, the microprocessor 287 requests the test terminal 390 to set up a call test, and the test terminal 390 receives the request. The call test proceeds to the set value, and an ACK for call test response is transmitted (step S12).

In step S13, the microprocessor 287 sets a reverse path to be measured, measures the reception sensitivity of the corresponding path in step S15 while the test terminal 390 maintains the call connection in step S14, and the corresponding path in step S16. Judge whether there is any abnormality.

As a result of the determination in step S16, if there is no abnormality in the corresponding path, the process proceeds to step S18. OFF, and the flow proceeds to step S18.

In step S18, the measurement of the corresponding path is completed, call setup is terminated, and the flow proceeds to step S19 to determine whether the measurement path is the first path.

As a result of the determination in step S19, when the corresponding path is the first path, the microprocessor 287 proceeds to step S20 to set the second path to be measured, and then proceeds to step S11 to measure the reception sensitivity of the second path. do.

On the other hand, as a result of the determination in step S19, when the corresponding path is the second path, all the paths have been measured. Check the status of and shut down the processor for the next measurement.

The foregoing description of the present invention is intended for illustration, and it will be understood by those skilled in the art that the present invention may be easily modified in other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is shown by the following claims rather than the above description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

1 is a schematic configuration diagram of a mobile communication system using an optical repeater.

2 is a block diagram illustrating a reception sensitivity measurement method of a mobile communication base station according to the prior art.

3 is a block diagram illustrating a reception sensitivity measurement method of a mobile communication base station using an optical repeater according to an embodiment of the present invention.

4 is a block diagram of a spectrum module for measuring the reception sensitivity of the output terminal of the master unit according to an embodiment of the present invention.

5 is a flowchart illustrating a method of measuring a reception sensitivity of a mobile communication base station using an optical repeater according to an embodiment of the present invention.

*** Explanation of symbols for the main parts of the drawing ***

10: base station 11: high power amplifier

12,15: BPF 14: Low Noise Amplifier

13, 16: antenna 15: error meter

20: optical repeater 21: master unit

23: slave unit 25: optical cable

30: mobile terminal 50: electromagnetic shielding case

51: test terminal 52: directional coupler

53, 54: Attenuator 55: Spectrum Analyzer

56: coupler 100: base station

110: high power amplifier 120: transmit antenna

130, 150: low noise amplifier 140, 160: receiving antenna

170, 180, 190: Coupler 200: Master Unit

220: forward RF module 230: reverse main RF module

240: reverse diversity RF module 250: optical module

260, 270: coupler 280: spectrum module

300: slave unit 310: optical module

320: high power amplifier 330: low noise amplifier

340: low noise amplifier 350: BPF

360: antenna 370: coupler

380: attenuator 390: test terminal

Claims (5)

In the receiving sensitivity measurement method of a base station using an optical repeater comprising a master unit connected to the base station and a slave unit connected to the master unit via an optical cable and RF communication with the mobile terminal, (a) requesting a call test to a test terminal embedded in the slave unit, (b) coupling a power controlled reverse signal from the test terminal at a reverse output of the master unit; and (c) analyzing the spectrum of the coupled reverse signal to measure the reception sensitivity of the base station Receiving sensitivity measurement method of a mobile communication base station comprising a. The method of claim 1, (d) determining an abnormality of a path corresponding to the reverse signal based on a spectrum analysis result of the reverse signal; and (e) if an abnormality occurs in the route, reporting a problem of the route to a higher level and controlling the route; Receiving sensitivity measurement method of a mobile communication base station further comprising. Claims [1] An apparatus for measuring reception sensitivity of a base station using an optical repeater including a master unit connected to a base station and a slave unit connected to the master unit via an optical cable and performing RF communication with a mobile terminal. An attenuator connected to an output of an antenna of the slave unit to attenuate a signal received from the base station, A test terminal embedded in the slave unit and transmitting a power controlled signal according to the strength of the attenuated signal; A spectrum module connected to a reverse output terminal of the master unit to analyze a spectrum of a signal received from the test terminal to measure a reception sensitivity of the base station Reception sensitivity measuring apparatus of a mobile communication base station comprising a. The method of claim 3, wherein A coupler for coupling the reverse signal received from the test terminal to the spectrum module at the reverse output of the master unit; Reception sensitivity measuring apparatus of a mobile communication base station further comprising. The method of claim 4, wherein A microprocessor for controlling the path of the reverse signal received from the coupler Reception sensitivity measuring apparatus of a mobile communication base station further comprising.

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