KR101020701B1 - Apparatus for measuring carrier to interference of rf repeater and antena tilting method thereof - Google Patents

Abstract

PURPOSE: A C/I(Carrier to Interference) value measurement apparatus of an input signal of an RF relay and an antenna tilting method of the RF relay are provided to receive a signal of high quality from an antenna by measuring an input level and C/I value of the input signal. CONSTITUTION: If a first C/I value about a signal inputted to a first duplexer of an RF relay is inputted to a second duplexer, a C/I value measuring unit(481) measures a second C/I value about a signal inputted to the second duplexer. A C/I value comparison unit(482) compares the first C/I value with the predetermined standard C/I value. A C/I value display unit displays the first C/I value, the second C/I value and a comparison result.

Description

C / I value measuring device of the input signal of the RF repeater and antenna tilting method of the RF repeater using the same {APPARATUS FOR MEASURING CARRIER TO INTERFERENCE OF RF REPEATER AND ANTENA TILTING METHOD THEREOF}

An apparatus for measuring a C / I value of a signal input from an base station to an RF repeater and a method of tilting an antenna of an RF repeater using the same.

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 of such a call shadow area, a plurality of repeaters are separately installed in the shadow area to provide a smooth call service.

The repeater amplifies and transmits the base station signal to the radio wave shadow area so that the signal of the base station can reach the radio wave shadow area, and amplifies and filters the terminal signal so that the signal of the terminal located in the radio wave shadow area can reach the base station It solves the problem of radio wave shading by sending it out.

1 is a detailed configuration diagram of an RF repeater according to the prior art.

As shown in FIG. 1, the RF repeater 200 according to the related art includes a first antenna 205, a first duplexer 210, a forward RF module 215, a first low power amplifier 220, and a first isolator. 225, first coupler 230, second duplexer 235, second antenna 240, reverse RF module 245, second low output amplifier 250, second isolator 255, and second coupler 260.

In the case of the forward channel, the RF signal transmitted from the base station 100 to the RF repeater 200 is transmitted to the first duplexer 210 through the first antenna 205, and the first duplexer 210 fixes the RF signal. The filtered frequency band is transmitted to the forward RF module 215. The forward RF module 215 amplifies or attenuates the forward signal to a designated signal level and delivers it to the first low output amplifier 220, and the first low output amplifier 220 amplifies the forward signal and sends it to the first isolator 225. do. The first isolator 225 transmits the amplified forward signal to the first coupler 230 by passing only the direction of the first coupler 230. The first coupler 230 transmits the forward signal transmitted from the first isolator 225 to the second duplexer 235, and the second duplexer 235 transmits the forward signal to the second antenna 240 so that the terminal ( 300).

In the reverse channel, the RF signal transmitted from the terminal 300 to the RF repeater 200 is transmitted to the second duplexer 235 through the second antenna 240, and the second duplexer 235 is connected to the second antenna (235). The RF signal transmitted through 240 is filtered to a fixed frequency band and transmitted to the reverse RF module 245. The reverse RF module 245 amplifies or attenuates the reverse signal to the designated signal level and delivers it to the second low output amplifier 250. The second low power amplifier 250 amplifies the reverse signal and delivers the reverse signal to the second isolator 255. The second isolator 255 transmits the amplified reverse signal to the second coupler 260 by passing only the direction of the second coupler 260. The second coupler 260 transmits the reverse signal transmitted from the second isolator 255 to the first duplexer 210, and the first duplexer 210 transmits the reverse signal to the first antenna 205 to provide a base station ( 100).

However, the RF repeater according to the prior art is a method of measuring the quality of the input signal in the channel used, and since the input signal in the repeater service area is good while the input signal in the repeater service area is good, since the input signal is judged to be good or bad. There is a problem that CALL DROP occurs during a call due to poor Carrier to Interference (I) value.

In addition, there is a problem that the quality of the operation due to the CALL DROP phenomenon in the service area and the problem is not easy to check.

One embodiment of the present invention measures the C / I value and the input level of the input signal of the RF repeater, by receiving the best quality signal from the antenna to prevent the call drop (Pop call drop) occurring in the service area can do.

As a technical means for achieving the above-described technical problem, a first aspect of the present invention is a device for measuring the C / I value of the input signal of the RF repeater, the first input to the signal input to the first duplexer of the RF repeater C / I value measurement for measuring a second C / I value for a signal input to the second duplexer when a 1 C / I value and a signal input to the first duplexer are input to the second duplexer through a forward RF module The C / I value comparing unit compares the measured first C / I value with a preset reference C / I value and the first C / I value, the second C / I value, and the first C / I value. Provided is a C / I value measuring device including a C / I value display unit for displaying a comparison result of an I value and the reference C / I value.

As a technical means for achieving the above technical problem, the second aspect of the present invention is an antenna tilting method using the C / I value of the input signal of the RF repeater, (a) input to the first duplexer of the RF repeater Coupling a signal, (b) measuring a first C / I value for the coupled signal, (c) satisfying a signal quality for the input signal with the first C / I value Comparing with a reference C / I value preset as a C / I threshold value; (d) if the first C / I value is less than the reference C / I value, as a result of the comparison in step (c), from the base station Performing a tilting of the antenna receiving the signal; (e) if the first C / I value is equal to or greater than the reference C / I value as a result of the comparison of the step (c), through the first duplexer Input and coupling a signal input to a second duplexer via a forward RF module (F) measuring a second C / I value for a signal coupled at the second duplexer, (g) comparing the second C / I value with the first C / I value, Determining whether the difference between the second C / I value and the first C / I value is within a predetermined range; and (h) fixing the position of the antenna based on the determination result of the step (g). An antenna tilting method of an RF repeater is provided.

According to one of the problem solving means of the present invention described above, by measuring the C / I value and the input level of the input signal of the RF repeater, and receiving the signal of the best quality from the antenna by cutting off the call occurring in the service area ( CALL DROP) can be prevented.

Hereinafter, 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. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. 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 "connected" to another part, this includes not only "directly connected" but also "electrically connected" with another element in between. . In addition, when a part is said to "include" a certain component, which means that it may further include other components, except to exclude other components unless otherwise stated.

Hereinafter, referring to FIGS. 2 to 4, an apparatus for measuring C / I values of an input signal of an RF repeater and an antenna tilting method of an RF repeater using the same will be described.

2 is a diagram illustrating a method of measuring an input signal and a C / I value from a base station using an RF repeater according to an embodiment of the present invention.

2, the RF repeater 400 according to an embodiment of the present invention includes a first antenna 405, a first duplexer 410, a forward RF module 415, a first low power amplifier 420, and a first antenna. 1 isolator 425, first coupler 430, second duplexer 435, second antenna 440, reverse RF module 445, second low output amplifier 450, second isolator 455, first And a second coupler 460, a third coupler 470, a fourth coupler 475, and a C / I value measuring device 480.

For the forward channel, the RF signal transmitted from the base station 100 to the RF repeater 400 is transmitted to the first duplexer 410 through the first antenna 405, the first duplexer 410 is a first antenna ( The RF signal transmitted through 405 is filtered into a fixed frequency band, separated into a forward signal and a reverse signal, and then forwarded to the forward RF module 415.

The forward RF module 415 amplifies or attenuates the forward signal to a specified signal level and forwards it to the first low output amplifier 420, and the first low output amplifier 420 amplifies the forward signal and forwards it to the first isolator 425. do.

The first isolator 425 passes the amplified forward signal only toward the first coupler 430 to the first coupler 430, and the first coupler 430 is forwarded from the first isolator 425. The signal is transmitted to the second duplexer 435.

The second duplexer 435 transmits the forward signal to the second antenna 440 and transmits the forward signal to the terminal 300.

In the reverse channel, the RF signal transmitted from the terminal 300 to the RF repeater 400 is transmitted to the second duplexer 435 through the second antenna 440, and the second duplexer 435 is connected to the second antenna (435). The RF signal transmitted through 440 is filtered to a fixed frequency band, separated into a forward signal and a reverse signal, and then the reverse signal is transmitted to the reverse RF module 445.

The reverse RF module 445 amplifies or attenuates the reverse signal to a specified signal level and transmits the reverse signal to the second low output amplifier 450. The second low output amplifier 450 amplifies the reverse signal to the second isolator 455. To pass.

The second isolator 455 passes the amplified reverse signal only in the direction of the second coupler 460 to deliver it to the second coupler 460, and the second coupler 460 is reversed from the second isolator 455. The signal is transmitted to the first duplexer 410.

The first duplexer 410 transmits the reverse signal to the first antenna 405 and transmits the reverse signal to the base station 100.

In the above configuration, the first duplexer 410 of the RF repeater 400 using the third coupler 470 to measure the C / I value of the forward signal input from the base station 100 to the RF repeater 400. And the C / I value measuring device 480. In addition, to measure the C / I value of the forward signal input to the RF repeater 400 and input to the second duplexer 435 through the forward RF module 415, the RF repeater (475) may be used. The second duplexer 435 of the 400 and the C / I value measuring device 480 are connected.

3 is a block diagram of a C / I value measuring apparatus for measuring a C / I value of a forward signal according to an embodiment of the present invention.

Referring to FIG. 3, the C / I value measuring apparatus 480 according to an embodiment of the present invention may include a C / I value measuring unit 481, a C / I value comparing unit 482, and a C / I value displaying unit ( 483 and an antenna position control unit 484.

The C / I value measuring unit 481 is input to the first duplexer 410 and measures the first C / I value of the signal coupled by the third coupler 470. In addition, the C / I value measuring unit 481 is inputted to the first duplexer 410 and then inputted to the second duplexer 435 via the forward RF module 420 and coupled by the fourth coupler 475. The second C / I value for the signal is measured.

The C / I value comparison unit 482 may satisfy the signal quality of the forward signal inputted through the first antenna 405 based on the first C / I value measured by the C / I value measuring unit 481. Compared with the reference C / I value preset as the / I threshold.

In addition, the C / I value comparison unit 482 compares the first C / I value of the signal input to the third coupler 470 and the second C / I value of the signal input to the fourth coupler 475. .

The C / I value display unit 483 compares the first C / I value, the second C / I value, the first C / I value with the reference C / I value measured by the C / I value measuring unit 481. The result and the comparison result of the first C / I value and the second C / I value are displayed.

When the first C / I value is less than the reference C / I value, the antenna position control unit 484 compares the signal with the first C / I value equal to or greater than the reference C / I value. The first antenna 405 is tilted until input. Also, the antenna position controller 484 may adjust the position of the first antenna 405 when the first C / I value is equal to or greater than the reference C / I value and the first C / I value and the second C / I value are the same. Fix it.

Until now, the C / I value measuring apparatus 480 of the present invention has been described as fixing the position of the first antenna 405 when the first C / I value and the second C / I value are the same. It is not necessarily limited thereto.

In the C / I value measuring apparatus 480 according to an embodiment of the present invention, the difference between the first C / I value and the second C / I value is within a predetermined range, for example, “0 ≦ | First C / I value. May be set to fix the position of the first antenna 405 in the case of the second C / I value |

The C / I value measuring apparatus 480 according to the embodiment of the present invention as described above, the first C / I value and the second C for the signals input to the third and fourth coupler (470, 475) The / I value may be measured, and the first C / I value may be compared with the reference C / I value and the second C / I value, respectively, to display the signal quality of the input signal.

In addition, the C / I value measuring apparatus 480 according to an embodiment of the present invention, when the first C / I value for the input signal is less than the reference C / I value is a signal that is equal to or greater than the reference C / I value Tilting the first antenna 405 until the first antenna 405 is fixed, and fixing the position of the first antenna 405 when the first C / I value and the second C / I value of the input signal equal to or greater than the reference C / I value are the same. As a result, the signal having the best quality among the signals input from the base station 100 may be received.

4 is a flowchart illustrating an antenna tilting method using a C / I value of an input signal of an RF repeater according to an embodiment of the present invention.

In step S11, the forward signal input from the base station 100 to the first duplexer 410 of the RF repeater 400 is coupled using the third coupler 470.

In step S12, the C / I value of the forward signal coupled by the third coupler 470, that is, the first C / I value is measured, and then the process proceeds to step S13, where the first C / I value is measured. Is compared with a reference C / I value preset as a C / I threshold value that satisfies the signal quality for the input signal, and it is determined whether the first C / I value is greater than or equal to the reference C / I value.

As a result of the determination in step S13, when the first C / I value is less than the reference C / I value, the process proceeds to step S14 to allow the first antenna 405 to receive an input signal that is greater than or equal to the reference C / I value. Perform tilting of.

Thereafter, by repeating steps S12 to S14, the first base station 100 performs tilting of the first antenna 405 until the first C / I value is equal to or greater than the reference C / I value. Receives the best quality signal from the signal.

On the other hand, if it is determined in step S13 that the first C / I value is greater than or equal to the reference C / I value, the process proceeds to step S15, which is input from the base station 100 and passed through the forward RF module 415. The forward signal input to the second duplexer 435 is coupled using the fourth coupler 475.

In step S16, the second C / I value for the forward signal coupled by the fourth coupler 475 is measured, and then the flow proceeds to step S17, where the first C / I value is the second C / I value. Determine if equal to I value

As a result of the determination in step S17, when the first C / I value is the same as the second C / I value, the flow advances to step S18 to fix the first antenna 405. Here, the C / I value measuring device 480 not only has a case where the first C / I value and the second C / I value are the same, but also the difference between the first C / I value and the second C / I value is within a predetermined range. For example, it may be set to fix the position of the first antenna 405 in the case of "0≤ | first C / I value-second C / I value | ≤ threshold".

On the other hand, if it is determined in step S17 that the first C / I value is not equal to the second C / I value, the process returns to step S14 and after the tilting of the first antenna 405 is performed. Steps S12 to S17 are repeatedly performed to receive a signal having the best quality among the signals from the base station 100.

One embodiment of the present invention can also be implemented in the form of a recording medium containing instructions executable by a computer, such as a program module executed by the computer. Computer readable media can be any available media that can be accessed by a computer and includes both volatile and nonvolatile media, removable and non-removable media. In addition, computer readable media may include both computer storage media and communication media. Computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Communication media typically includes computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave, or other transmission mechanism, and includes any information delivery media.

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. It is therefore to be understood that the above-described embodiments are illustrative in all aspects 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 detailed configuration diagram of an RF repeater according to the prior art.

2 is a view for explaining a method of measuring the input signal and the C / I value from the base station to the RF repeater according to an embodiment of the present invention.

3 is a block diagram of a C / I value measuring module for measuring a C / I value of a forward signal according to an embodiment of the present invention.

4 is a flowchart illustrating an antenna tilting method of an RF repeater using a C / I value measuring module according to an embodiment of the present invention.

Claims (5)

In the device for measuring the C / I value of the input signal of the RF repeater, A first C / I value for a signal input to the first duplexer of the RF repeater and a signal input to the second duplexer when the signal input to the first duplexer is input to the second duplexer through a forward RF module A C / I value measuring unit measuring a second C / I value, A C / I value comparison unit comparing the first C / I value with a preset reference C / I value; A C / I value display unit displaying a comparison result of the first C / I value, the second C / I value, and the first C / I value and the reference C / I value C / I value measuring apparatus comprising a. The method of claim 1, Based on the comparison result, when the first C / I value is less than the reference C / I value, a signal is received from a base station until the first C / I value is greater than or equal to the reference C / I value. Antenna position control unit for tilting the antenna C / I value measuring apparatus further comprising. The method of claim 2, The C / I value comparison unit further compares the first C / I value and the second C / I value, The antenna position control unit is further configured to determine the first C / I value and the second C / I value based on a comparison result of the first C / I value and the second C / I value of the C / I value comparison unit. And fixing the position of the antenna when the difference is within a predetermined range. In the antenna tilting method using the C / I value of the input signal of the RF repeater, (a) coupling a signal input to a first duplexer of the RF repeater, (b) measuring a first C / I value for the coupled signal, (c) comparing the first C / I value with a reference C / I value preset as a C / I threshold that satisfies signal quality for the input signal, (d) performing a tilting of an antenna receiving a signal from a base station when the first C / I value is less than the reference C / I value as a result of the comparison in step (c); (e) when the first C / I value is greater than or equal to the reference C / I value as a result of the comparison in step (c), a signal input through the first duplexer and a second duplexer through a forward RF module; Coupling the (f) measuring a second C / I value for the coupled signal at the second duplexer, (g) comparing the second C / I value with the first C / I value to determine whether a difference between the second C / I value and the first C / I value is within a predetermined range; and (h) fixing the position of the antenna based on the determination result of step (g) Antenna tilting method of the RF repeater comprising a. The method of claim 4, wherein And tilting the antenna when the first C / I value is equal to or greater than the reference C / I value and the first C / I value and the second C / I value are the same. Way.

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