KR20050000889A - Relay apparatus capable of optimally setting reverse gain, and reverse status analyzing apparatus and method thereof - Google Patents

Abstract

PURPOSE: A repeater capable of setting the optimum reverse gain, an apparatus for analyzing a reverse state in the repeater, and a method for the analyzing are provided to eliminate an unnecessary noise level increase by exactly analyzing the state of a reverse path, regardless of forward output variations, and automatically setting a necessary gain at an optimum. CONSTITUTION: A reverse state analysis part(300) in a repeater system capable of setting the optimum reverse gain comprises a measuring terminal(310), a two-way add/drop unit(320), an RF switch(340), and a signal analyzer(330). The two-way add/drop unit(320) identically drops a signal outputted from the measuring terminal(310) to the RF switch(340) and the signal analyzer(330), and transfers a signal outputted from the RF switch(340) to the measuring terminal(310). The signal analyzer(330) receives and analyzes the signal dropped through the two-way add/drop unit(320), extracts a power control parameter, and outputs it to a control part(200). The RF switch(340) interrupts either a main Rx path or a diversity Rx path so that the signal outputted from the two-way add/drop unit(320) can be selectively outputted to a directional combiner(120) located on the main Rx path or a directional combiner(160) located on the diversity Rx path.

Description

RELAY APPARATUS CAPABLE OF OPTIMALLY SETTING REVERSE GAIN, AND REVERSE STATUS ANALYZING APPARATUS AND METHOD THEREOF}

The present invention relates to a relay apparatus for a mobile telephone service, and more particularly, to a relay apparatus capable of setting an optimal reverse gain, a reverse analysis apparatus in the apparatus, and a method thereof.

Mobile phone services, especially Code Division Multiple Access (CDMA) or Wide Code Division Multiple Access (WCDMA), inevitably generate radio shadow areas where base station signals cannot reach, such as underground parking lots, underground malls, and buildings. As an economical solution for radio shade areas, relay devices are now widely used.

The gain setting in such a relay device needs to be stably serviced at an optimum gain in order to secure not only forward coverage but also reverse coverage.

However, in the conventional relay device, when the forward output is lowered, the automatic gain control (AGC) function is used to maintain the output at a constant level or when the output is below a certain level, the automatic limit control is performed. It provides only limited performance for forward coverage stability, such as automatic return to minimum level using ALC) function.

1 is a block diagram of a relay apparatus that performs gain control of a forward output for a conventional wireless telephone service.

Referring to FIG. 1, a wireless signal received from a base station through a base station interface 10 is a low noise amplified by a low noise amplifier (LNA) 12 and then a variable attenuator controlled by the controller 44. The output is properly adjusted through the VA1, 14, and amplified into a high power signal that can be output wirelessly by the High Power Amplifier (HPA) 16 to connect the duplexer 18 and the directional coupler 20. Via the antenna 22 is transmitted to the mobile terminal. Here, low noise amplifier 12, variable attenuator 14, high output amplifier 16, duplexer 18 and directional coupler 20 form a transmission path. Here, the base station interface 10 may be connected to the base station through an optical transmission line or may be connected through an ultrahigh frequency or RF signal.

Meanwhile, the signal transmitted from the mobile terminal and received through the antenna 30 is formed by the directional coupler 20, the duplexer 18, the low noise amplifier 24, the variable attenuators VA2 and 26 and the high power amplifier 28. To the base station interface 10 via the primary receive path. At this time, the variable attenuator 26 properly adjusts the output of the signal received from the mobile terminal under the control of the controller 44 and low-amplified by the low noise amplifier 24.

Here, the directional coupler 20 separates and outputs a signal transmitted from the duplexer 18 to the mobile terminal through the antenna 22.

On the other hand, a signal transmitted from the mobile terminal and received through the diversity reception antenna 30 is a directional coupler 32, a band pass filter 34, a low noise amplifier 36, variable attenuators VA3, 38 and a high output amplifier. Received to base station interface 10 via a diversity receive path formed by 40. The variable attenuator 38 here adjusts the output of the signal received from the mobile terminal under low control of the low noise amplifier 36 under the control of the controller 44.

On the other hand, the power detector 42 detects the power of the signal output from the directional coupler 20 on the transmission path and outputs it to the control unit 44, the control unit 44 is the power of the signal detected by the power detector 42 A control signal for adjusting the forward gain according to the level is output to the variable attenuators VA1 and 14 on the transmission path to adjust the forward gain through AGC or ALC. That is, the controller 44 is configured to continuously maintain the power of the signal detected by the power detector 42 at the value of the set magnitude or change the gain to be the set value only when the power is smaller than the set magnitude. 14). The controller 44 also outputs control signals to the variable attenuators VA2 and 26 on the main receive path and the variable attenuators VA3 and 38 on the diversity receive path to adjust the reverse gain in conjunction with the forward gain. The reverse gain can be adjusted.

As described above, the backward gain adjustment cannot be linked to the forward gain adjustment simply because the exact gain value required in the reverse direction is not known, which leads to an unnecessary noise level increase in the reverse direction of the base station. This diminishing problem occurs.

Accordingly, an object of the present invention is to solve the above-mentioned conventional problems, and a relay apparatus capable of setting an optimum reverse gain which automatically sets the required gain by accurately analyzing the state of the reverse path irrespective of the output fluctuation in the forward direction. The present invention provides a reverse state analysis apparatus and a method thereof.

1 is a block diagram of a relay apparatus that performs gain control of a forward output for a conventional wireless telephone service.

2 is a block diagram of a relay apparatus capable of setting an optimal reverse gain according to an embodiment of the present invention.

In order to achieve the above object, a reverse state analysis apparatus in a relay apparatus according to a feature of the present invention,

The mobile device relays a wireless signal related to a mobile telephone service between a base station and a mobile terminal, and includes a control unit which detects signal power transmitted through a forward path transmitted from the base station to the mobile terminal and controls the forward gain. An apparatus for analyzing a state of radio communication of a reverse path transmitted from a terminal to the base station,

A measurement terminal capable of wireless communication for the base station and a mobile telephone service; Analyzing the signal output from the measurement terminal under the control of the base station to extract the state information of the reverse wireless communication so that the control unit controls the gain of the reverse wireless communication according to the extracted state information of the reverse wireless communication A signal analyzer output to the controller; Located between the measuring terminal and the signal analyzer, and outputs the signal output from the measuring terminal separated into two paths to the signal analyzer and the base station connected through the reverse path, the output from the base station And a two-path combiner / separator for transmitting the signal to the measurement terminal.

Here, the reverse state analysis apparatus is connected to the measurement terminal when the relay device includes a diversity reception reverse path for receiving a diversity signal transmitted from the mobile terminal and relaying the diversity signal to the base station. And an RF switch for selectively setting a path between one of the path and the diversity reception reverse path and the measurement terminal.

In addition, the RF switch controls the gain of the reverse wireless communication by setting a path between the measurement terminal and the reverse path for a predetermined time, and then set a path between the measurement terminal and the diversity reception path. It is desirable to set for time to control the gain of reverse wireless communication by the diversity reception path.

According to another aspect of the present invention, a repeater capable of setting a reverse gain includes:

An apparatus for relaying a mobile telephone service-related radio signal between a base station and a mobile terminal,

A base station interface for transmitting and receiving wireless signals with the base station; A transmission and reception antenna for transmitting and receiving a wireless signal with the mobile terminal; Located between the base station interface and the transmission and reception antenna, the signal output from the base station interface to the transmission and reception antenna is separated and output, and the signal input from the outside is combined with the signal output to the base station interface from the transmission and reception antenna A first directional coupler; A first variable attenuator positioned between the base station interface and the transmit / receive antenna, the first variable attenuator adjusting a gain of a signal received at the transmit / receive antenna and transmitted to the base station interface; And a measurement terminal capable of wireless communication for the base station and a mobile telephone service, and a reverse state for extracting state information of reverse wireless communication by analyzing a signal output from the measurement terminal to the base station under control of the base station. An analysis unit; And a control unit outputting a gain control signal to the first variable attenuator to control the gain of the reverse wireless communication according to the state information of the reverse wireless communication extracted by the reverse state analyzing unit.

In addition, the relay device capable of setting the reverse gain, Diversity reception antenna for receiving a radio signal transmitted from the mobile terminal; A second directional coupler positioned between the base station interface and the diversity reception antenna, the second directional coupler outputting a signal input from the reverse state analyzer to a signal output from the diversity reception antenna to the base station interface; And a second variable attenuator positioned between the base station interface and the diversity reception antenna, the second variable attenuator adjusting a gain of a signal received by the diversity reception antenna and transmitted to the base station interface, wherein the reverse state analysis is performed. The processor extracts state information of reverse wireless communication by the diversity reception path by analyzing a signal transmitted by the measurement terminal to the base station through a diversity reception path formed between the diversity reception antenna and the base station interface. The controller may be configured to control the gain of the reverse wireless communication by the diversity receiving path according to the state information of the reverse wireless communication by the diversity receiving path extracted by the reverse state analyzing unit. Output signal for gain control It is preferable to.

Here, the measuring terminal is preferably controlled by a signal transmitted from the base station through the base station interface and output separately from the first directional coupler.

In addition, the measurement terminal preferably outputs a power control parameter indicating a current state of the measurement terminal in a short message under the control of the base station.

Here, the power control parameter is a parameter representing the power of the pilot versus the total power, a parameter representing the transmission power of the measurement terminal, a parameter representing the transmission adjustment value of the measurement terminal, the received electric field strength measured by the measurement terminal Contains parameters that represent.

In addition, the relay device capable of setting the reverse gain, the relay device is located between the base station interface and the transmit and receive antennas, a third variable attenuator for adjusting the gain of the signal received at the base station interface and transmitted to the transmit and receive antennas; And a power detector configured to detect a power level of a signal output from the base station interface and separated from the first directional coupler, wherein the controller is configured to transmit and receive the base station interface and the transmit / receive antenna according to the power level detected by the power detector. It is preferable to output a gain control signal to the third variable attenuator in order to control the gain of forward wireless communication by the transmission path formed therebetween.

Reverse state analysis method in a relay device according to another aspect of the present invention,

The mobile device relays a wireless signal related to a mobile telephone service between a base station and a mobile terminal, and includes a control unit which detects signal power transmitted through a forward path transmitted from the base station to the mobile terminal and controls the forward gain. A method for analyzing the state of wireless communication in a reverse path transmitted from a terminal to the base station,

a) a measurement terminal capable of wireless communication for mobile telephone service with the base station transmitting a signal including the state information of the reverse wireless communication to the base station through the reverse path under the control of the base station; b) receiving and analyzing the transmitted signal; And c) outputting, by the controller, the state information of the reverse wireless communication extracted as a result of the analysis to the controller so as to control the gain of the reverse wireless communication according to the extracted state information of the reverse wireless communication.

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. Like parts are designated by like reference numerals throughout the specification.

First, a relay apparatus capable of setting an optimal reverse gain according to an embodiment of the present invention will be described in detail.

2 is a block diagram of a relay apparatus capable of setting an optimal reverse gain according to an embodiment of the present invention.

As shown in FIG. 2, the relay apparatus capable of setting an optimal reverse gain according to an embodiment of the present invention includes a base station interface 100, low noise amplifiers 102, 142, and 182, and variable attenuators 104, 144, and 184. , High power amplifiers 106, 146, 186, duplexer 110, directional couplers 120, 160, transmit / receive antennas 130, diversity receive antennas 150, bandpass filters 170, power detectors ( 190, the controller 200 and the reverse state analyzer 300.

The reverse state analyzer 300 includes a measurement terminal 310, a two-path combiner / separator 320, an RF switch 340, and a signal analyzer 330.

Here, the transmission path formed by the low noise amplifier 102, the variable attenuators VA4 and 104, the high output amplifier 106, the duplexer 110, the directional coupler 120, and the antenna 130 for transmitting and receiving is a base station interface 100 Receives the base station signal output from the amplified and relayed to the mobile terminal in the forward direction, transmitting and receiving antenna 130, directional coupler 120, duplexer 110, low noise amplifier 142, variable attenuator (VA5, 144) and high power The main reception path formed by the amplifier 146 receives and amplifies the radio signal transmitted from the mobile terminal and relays the signal to the base station interface 100 in the reverse direction. The diversity reception antenna 150, the directional coupler 160, and the band pass The diversity reception path formed of the filter 170, the low noise amplifier 182, the variable attenuators VA6 and 184, and the high output amplifier 186 receives and amplifies the diversity signal transmitted from the mobile terminal in reverse direction. Output to the station interface 100. Detailed functions and operations of the components constituting the transmission path, the main reception path, and the diversity reception path are similar to those of the conventional technology described with reference to FIG. 1, and thus will be easily understood when referring to FIG. For convenience, the description will be omitted here and only different portions will be described.

First, the directional coupler 120 separates the signal output from the duplexer 110 to the transmitting and receiving antenna 130 on the transmission path in the case of the forward direction and outputs the signal to the power detector 190, but in the case of the forward direction The signal is also output to the reverse state analyzer 300, and in the reverse case, the signal output from the reverse state analyzer 300 to the duplexer 110 is different from the conventional.

In addition, the directional coupler 160 on the diversity reception path is different from the conventional method in that it transmits the signal output from the reverse state analyzer 300 to the band pass filter 170.

Meanwhile, the power detector 190 receives a signal output from the directional coupler 120 on the transmission path, detects the power level, and outputs the signal to the controller 200 as in the related art.

Meanwhile, the two-path combiner / separator 320 of the reverse state analyzer 300 splits the signal output from the measurement terminal 310 into the signal analyzer 330 and the RF switch 340 and outputs the same. The signal output from the RF switch 340 is transmitted to the measurement terminal 310. At this time, the measurement terminal 310 transmits a short message service (SMS) mainly by a command of the base station, and the short message is a current power control parameter of the measurement terminal 310. Include the corresponding content. The power control parameters of the measurement terminal 310 include pilot power / total received power (Ec / Io) representing the power of the pilot versus total power, Txpwr (Tx Power) representing the transmission power of the measurement terminal 310, and the measurement. Txadj (Tx Adjust) indicating a transmission adjustment value of the terminal 310, RSSI (Received Signal Strength Indicator), which is a received electric field strength measured by the measuring terminal 310, and the like.

The signal analyzer 330 receives a signal output from the measurement terminal 310 through the two-path combiner / separator 320, that is, a short message including a power control parameter, and analyzes the parameter to determine the reverse state; That is, the power control parameter is extracted and output to the controller 200. These power control parameters are values that vary depending on the loss to the base station and the current gain of the relay device. Here, the signal analyzer 330 may have a different form according to the mobile phone service used between the base station and the measurement terminal 310. For example, in the case of the CDMA / WCDMA service, the signal analyzer 330 also transmits the CDMA / WCDMA service. It must have a structure that can analyze the signal.

The RF switch 340 may selectively output a signal output from the two-path combiner / separator 320 to the directional coupler 120 on the main receive path and the directional coupler 160 on the diversity receive path. Enforce each route. This enforcement may be set by the user, where the short message sent from the measurement terminal 310 is initially sent to the directional coupler 120 for a period of time to transmit to the directional coupler 120 on the main receiving path. The path to the directional coupler 160 on the diversity receiving path after the connection to the directional coupler 160 after blocking the path to the directional coupler 120 after a predetermined time, The short message transmitted from the measurement terminal 310 is received through the diversity reception path.

On the other hand, the measurement terminal 310 of the reverse state analysis unit 300 is a command of the base station through the directional coupler 120 on the transmission path connected through the two-path combiner / separator 320 and the RF switch 340. And the base station through the directional coupler 160 and the directional coupler 160 connected to the current terminal power control parameter via the two-path combiner / separator 320 and the RF switch 330 when the base station requests the short message. Will be sent to the side.

Meanwhile, the controller 200 outputs a signal for adjusting the gain in the forward direction to the variable attenuator 104 based on the signal power level on the transmission path detected by the power detector 190, and also the reverse state analyzer 300. A variable attenuator 144 on the primary receive path and a variable attenuator 184 on the diversity receive path are supplied to the control signal for the reverse gain adjustment using a parameter indicating a reverse state output from the signal analyzer 330 of FIG. Are printed respectively.

Hereinafter, the operation of the relay apparatus capable of setting the optimum reverse gain according to the embodiment of the present invention will be described in detail.

First, the forward gain control through the transmission path is controlled by the control unit 200 according to the power level detected by the power detector 190 in the signal separated by the directional coupler 120, the variable attenuators VA4, 103 on the transmission path. The control is performed as described above in the related art with reference to FIG. 1, and thus detailed description thereof will be omitted.

Next, reverse gain control will be described in detail.

There are two kinds of reverse gain control, the reverse gain control by the primary receive path and the reverse gain control by the diversity receive path, where the reverse gain control by the primary receive path is first performed by the base station for a predetermined time, and then Although assuming that reverse gain control by the diversity reception path is performed after a certain time, it will be easily understood that the result is the same even if the order is reversed.

First, the RF switch 340 is switched so that the path between the two-path combiner / separator 320 and the directional coupler 120 is established, and the signal transmitted from the base station through the transmission path is separated from the directional coupler 120. And is received by the measurement terminal 310 through the RF switch 340 and the two-path combiner / separator 320. In this case, the received signal is a signal for requesting a short message to the measurement terminal 310.

Meanwhile, the measurement terminal 310 transmits a short message indicating a current power control parameter of the measurement terminal 310 according to a request from the base station through the two-path combiner / separator 320 and the RF switch 320. If output to 120, it is combined by the directional coupler 120 into a signal of the primary receive path and transmitted to the base station through the primary receive path. In this case, the RF switch 340 sets the paths of the directional coupler 120 and the two-path combiner / separator 320 on the main receive path for a predetermined time to check the reverse state of the main receive path.

In addition, the two-path combiner / separator 320 branches the signal transmitted by the measurement terminal 310 according to the request of the base station and outputs the signal to the signal analyzer 330. The signal analyzer 330 analyzes the signal transmitted through the two-path combiner / separator 320, extracts a power control parameter for knowing the reverse state of the main reception path from the short message, and outputs the power control parameter to the controller 200.

Next, the controller 200 determines whether it is necessary to adjust the reverse gain using a parameter indicating a reverse state output from the signal analyzer 330 of the reverse state analyzer 300, that is, a power control parameter. If it is determined that it is necessary to adjust the reverse gain according to the loss to the base station and the variation of the current gain value of the relay device, the main signal is output by outputting a control signal for adjusting the reverse gain to the variable attenuators VA5 and 144 on the main receiving path. The reverse gain by the path is controlled to be optimal.

When the reverse gain control by the primary receive path is completed, the path between the two-path combiner / separator 320 and the directional coupler 160 on the diversity receive path is immediately or after a predetermined time. It is switched to set so that reverse gain control by the diversity receive path can be performed.

Next, the measuring terminal 310 sends a short message indicating the current power control parameter of the measuring terminal 310 according to a request from the base station through the two-path combiner / separator 320 and the RF switch 320. When outputting to the predetermined time for 160, the directional coupler 180 is combined into a signal of the diversity reception path and transmitted to the base station through the diversity reception path. In this case, the RF switch 340 sets the paths of the directional coupler 160 and the two-path combiner / separator 320 on the diversity receive path for a predetermined time to check the reverse state of the diversity receive path. have.

In addition, the two-path combiner / separator 320 branches the signal transmitted by the measurement terminal 310 and outputs the signal to the signal analyzer 330. The signal analyzer 330 analyzes the signal transmitted through the two-path combiner / separator 320, extracts a power control parameter for identifying a reverse state of the diversity reception path from the short message, and outputs the power control parameter to the controller 200. .

Next, the controller 200 adjusts the reverse gain of the diversity receive path by using a parameter indicating a reverse state of the diversity receive path output from the signal analyzer 330 of the reverse state analyzer 300, that is, a power control parameter. It is necessary to determine whether it is necessary, and if it is determined that it is necessary to adjust the reverse gain according to the loss to the base station and the variation of the current gain value of the relay device, the control signal for adjusting the reverse gain of the diversity reception path is diverted. Output to the variable attenuators VA6 and 184 on the city receive path to optimally control the reverse gain by the diversity receive path.

Although the preferred embodiment of the present invention has been described in detail above, the present invention is not limited thereto, and various other changes and modifications are possible.

For example, in the above, only the case where both the primary reception path and the diversity reception path exist is described, but the technical scope of the present invention is not limited thereto, and the present invention is also applicable to the case where there is no diversity reception path and only the primary reception path. It will be readily understood by those skilled in the art. In this case, it is not necessary to use the RF switch 340 used for the selective path setting between the main reception path and the diversity reception path.

According to the present invention, the required gain can be optimally set automatically by accurately analyzing the state of the reverse path irrespective of the output fluctuation in the forward direction, thereby eliminating unnecessary noise level rise in the reverse direction, thereby preventing the reverse capacity reduction. have.

Claims (12)

The mobile device relays a wireless signal related to a mobile telephone service between a base station and a mobile terminal, and includes a control unit which detects signal power transmitted through a forward path transmitted from the base station to the mobile terminal and controls the forward gain. An apparatus for analyzing a state of wireless communication in a reverse path transmitted from a terminal to the base station, A measurement terminal capable of wireless communication for the base station and a mobile telephone service; Analyzing the signal output from the measurement terminal under the control of the base station to extract the state information of the reverse wireless communication so that the control unit controls the gain of the reverse wireless communication according to the extracted state information of the reverse wireless communication A signal analyzer output to the controller; And Located between the measurement terminal and the signal analyzer, the signal output from the measurement terminal is separated into two paths to the signal analyzer and the base station connected through the reverse path, and outputs the signal from the base station 2-path combiner / separator for transmitting to the measurement terminal Reverse state analysis device in the relay device comprising a. The method of claim 1, When the relay device includes a diversity reception reverse path that receives a diversity signal transmitted from the mobile terminal and relays the diversity signal to the base station, And an RF switch connected to the measurement terminal for selectively setting a path between the reverse path and one of the diversity reception reverse paths and the measurement terminal. The method of claim 2, The RF switch controls the gain of the reverse wireless communication by setting a path between the measurement terminal and the reverse path for a predetermined time. Controlling a gain of reverse wireless communication by the diversity reception path by setting a path between the measurement terminal and the diversity reception path for a predetermined time; Reverse state analysis device in the relay device, characterized in that. An apparatus for relaying a mobile telephone service-related radio signal between a base station and a mobile terminal, A base station interface for transmitting and receiving wireless signals with the base station; A transmission and reception antenna for transmitting and receiving a wireless signal with the mobile terminal; Located between the base station interface and the transmission and reception antenna, the signal output from the base station interface to the transmission and reception antenna is separated and output, and the signal input from the outside is combined with the signal output to the base station interface from the transmission and reception antenna A first directional coupler; A first variable attenuator positioned between the base station interface and the transmit / receive antenna, the first variable attenuator adjusting a gain of a signal received at the transmit / receive antenna and transmitted to the base station interface; And a measurement terminal capable of wireless communication for the base station and a mobile telephone service, and a reverse state for extracting state information of reverse wireless communication by analyzing a signal output from the measurement terminal to the base station under control of the base station. An analysis unit; And A control unit which outputs a gain control signal to the first variable attenuator to control the gain of the reverse wireless communication according to the state information of the reverse wireless communication extracted by the reverse state analyzing unit Relay apparatus capable of setting a reverse gain comprising a. The method of claim 4, wherein A diversity reception antenna for receiving a radio signal transmitted from the mobile terminal; A second directional coupler positioned between the base station interface and the diversity reception antenna, the second directional coupler outputting a signal input from the reverse state analyzer to a signal output from the diversity reception antenna to the base station interface; And A second variable attenuator positioned between the base station interface and the diversity reception antenna and adjusting a gain of a signal received by the diversity reception antenna and transmitted to the base station interface More, The reverse state analysis unit analyzes a signal transmitted by the measurement terminal to the base station through a diversity reception path formed between the diversity reception antenna and the base station interface, thereby performing reverse wireless communication by the diversity reception path. Extract status information, The control unit controls gain with the second variable attenuator to control gain of reverse wireless communication by the diversity receiving path according to state information of reverse wireless communication by the diversity receiving path extracted by the reverse state analyzing unit. Output signal A relay device capable of setting a reverse gain, characterized in that. The method according to claim 4 or 5, And the measurement terminal is controlled by a signal transmitted from the base station through the base station interface and separated and output from the first directional coupler. The method of claim 6, And the measurement terminal outputs a power control parameter indicating a current state of the measurement terminal in a short message under the control of the base station. The method of claim 7, wherein The power control parameter is a parameter representing the power of the pilot versus the total power, a parameter representing the transmission power of the measurement terminal, a parameter representing a transmission adjustment value of the measurement terminal, and a received electric field strength measured at the measurement terminal. Relay apparatus capable of setting a reverse gain comprising one or more of the parameters. The method of claim 5, The reverse state analysis unit, An RF switch for selectively setting a path between the measurement terminal and the first directional coupler and the second directional coupler; Divers formed between the diversity reception antenna and the base station interface by analyzing the signal output from the measurement terminal and the status information of the reverse wireless communication by the main receiving path formed between the transmitting and receiving antenna and the base station interface A signal analyzer which extracts state information of reverse wireless communication by a city receiving path and outputs the state information to the controller; And Located between the measuring terminal and the RF switch, the signal output from the measuring terminal is separated into two paths to the signal analyzer and the RF switch and outputs, and the signal output from the RF switch for the measurement 2-path combiner / separator passing to terminal Relay apparatus capable of setting a reverse gain comprising a. The method according to claim 4 or 5, A third variable attenuator positioned between the base station interface and the transmit / receive antenna and adjust a gain of a signal received at the base station interface and transmitted to the transmit / receive antenna; And A power detector for detecting a power level of a signal output from the base station interface and separated at the first directional coupler More, The control unit outputs a gain control signal to the third variable attenuator to control gain of forward wireless communication by a transmission path formed between the base station interface and the transmit / receive antenna according to the power level detected by the power detector. A relay device capable of setting a reverse gain, characterized in that. The mobile device relays a wireless signal related to a mobile phone service between a base station and a mobile terminal, and includes a control unit configured to detect signal power transmitted through a forward path transmitted from the base station to the mobile terminal to control the forward gain. In the method for analyzing the state of the radio communication of the reverse path transmitted from the terminal to the base station, a) a measurement terminal capable of wireless communication for mobile telephone service with the base station transmitting a signal including the state information of the reverse wireless communication to the base station through the reverse path under the control of the base station; b) receiving and analyzing the transmitted signal; And c) outputting, by the controller, the state information of the reverse wireless communication extracted as a result of the analysis to the control unit so as to control the gain of the reverse wireless communication according to the extracted state information of the reverse wireless communication; Reverse state analysis method in a relay device comprising a. The method of claim 11, When the relay device includes a diversity reception reverse path that receives a diversity signal transmitted from the mobile terminal and relays the diversity signal to the base station, And before the step a), selectively setting a path between the reverse path and one of the diversity reception reverse paths and the measurement terminal.