JP2009283996A - Radio relay amplification device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent noise generated by an up variable gain amplification section from being transmitted to a base station while securing radio communication from the base station to a mobile terminal. <P>SOLUTION: A control section 5 detects propagation losses for each base station transmitting received down signals S<SB>D</SB>, obtains the optimum gain value based upon a base station having the smallest propagation loss, and sets the gain value to a down variable gain amplification section 3 and an up variable gain amplification section 8. The down variable gain amplification section 3 is always in an operation state and the up variable gain amplification section 8, on the other hand, is in a non-operation state as the control section 5 turns off a power switch 12 when an up signal S<SB>U</SB>whose RSSI (Received Signal Strength Indicator) value detected by an up reception section 11 is less than a threshold is not received, but is placed in an operation state as the control section 5 turns on the power switch 12 when an antenna 7 receives the up signal S<SB>U</SB>from the mobile terminal and the RSSI value of the up signal S<SB>U</SB>detected by the up reception section 11 becomes not less than the threshold. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a radio relay amplifying apparatus in a radio communication system using a W-CDMA (Wideband-Code Division Multiple Access) system, and more particularly, to uplink quality improvement.

  When performing wireless communication between a base station and a mobile terminal such as a mobile phone, when the mobile terminal moves through an underground store, underground mall, tunnel, etc., radio waves from the base station are difficult to reach the mobile terminal and communication is not possible There is. Therefore, conventionally, a wireless relay amplification device is installed in an area where radio waves are difficult to reach, and receives a downstream signal transmitted from a base station and an upstream signal transmitted from a mobile terminal, and amplifies them with an optimum gain. And transmit to mobile terminals and base stations. Thereby, it is possible to communicate with the base station even in an area where communication has not been possible so far, and the service area can be expanded.

  FIG. 4 is a block diagram showing a conventional example of a radio relay amplification apparatus, in which 1 is an antenna, 2 is a duplexer, 3 is a downlink variable gain amplifier, 4 is a downlink receiver, 5 is a controller, and 6 is a duplexer. , 7 is an antenna, 8 is an uplink variable gain amplifier, 9 is a downlink, and 10 is an uplink.

In the figure, a downlink signal _SD from a base station (not shown) is received by an antenna 1 and separated by a duplexer 2 to the downlink 9 side. In the downlink 9, the downlink signal _SD from the duplexer 2 is supplied to the downlink variable gain amplifying unit 3 and the downlink receiving unit 4. Downlink receiving unit 4, to the downstream signal S _D, performs cell search to identify the base station transmitting a downlink signal S _D, included in the transmitted downlink signal S _D from the identified base stations respectively The broadcast information received is decoded, the reception level of the common pilot channel of each downlink signal _SD is measured, and the broadcast information _SD received from these base stations and the reception level are supplied to the control unit 5. .

Here, an area where each base station can transmit to a mobile terminal, that is, a cell is formed, and each base station receives a transmission signal from the mobile terminal in the cell, and transmits it to a downlink signal. Although it is transmitted as S _D , there are areas where adjacent cells overlap each other, and a transmission signal from a portable terminal existing in an area where a plurality of such cells overlap each other is transmitted for each cell. Are transmitted at the base stations corresponding to, and simultaneously transmitted as downlink signals _SD from these base stations. For this reason, downlink signals _SD from different base stations by the same mobile terminal may be simultaneously received by the antenna 1 and input to the downlink 9.

In this way, when the downlink signal S _D from the same mobile terminal is simultaneously received from a plurality of base stations, the downlink receiver 4 identifies each base station that transmits the downlink signal S _D, and The broadcast information and the reception level of the downlink signal _SD are supplied to the control unit 5.

Information indicating the transmission level of the common pilot channel when the base station transmits the downlink signal _SD is added to the broadcast information. The control unit 5 reads this transmission level from the broadcast information of the downlink signal _SD for each base station specified by the downlink receiving unit 4, and calculates the difference (propagation loss) between this transmission level and the measured reception level. An optimum gain value is obtained on the basis of the base station that minimizes the propagation loss so that the downlink signal _SD from the reference base station is at an optimum level, and this gain value is obtained as a variable variable gain. It is set in the amplifying unit 3 and the up variable gain amplifying unit 8 in the up line 10.

The downlink signal _SD separated by the duplexer 2 is amplified by the downlink variable gain amplifying unit 3 in which the gain value is set, and transmitted from the antenna 7 to a predetermined portable terminal (not shown) via the duplexer 6.

Further, the antenna 7 receives an uplink signal S _U from a mobile terminal (not shown), and is separated to the uplink 10 side by the duplexer 6. On the uplink 10, the uplink signal S _U from the duplexer 6 is amplified by the uplink variable gain amplification unit 8 in which the above gain value is set, and then transmitted from the antenna 1 to a base station (not shown) via the duplexer 2. The

  As described above, since the radio relay amplifying device amplifies and relays between the base station and the portable terminal, radio communication with the base station is excellent in an area where radio waves from the base station are difficult to reach. By installing such a wireless relay amplification device, wireless communication between the base station and the mobile terminal in an area where radio waves are difficult to reach can be performed satisfactorily.

  On the other hand, in such a wireless relay amplification device, a technique has been proposed in which both the downlink variable gain amplification unit and the uplink variable gain amplification unit are turned off during a period when they are not used to reduce power consumption. (For example, refer to Patent Document 1).

For this reason, in the technique described in Patent Document 1, a timer is used as an example when installed in a subway, and thereby, a down variable gain amplifying unit and an up variable gain amplifying unit from the last train time to the first departure time. The power is turned off, and the case where it is installed in a building or underground shopping center is used as an example. When the power to the amplifying unit is turned off and even one person enters the room, the power to the downstream variable gain amplifying unit and the upstream variable gain amplifying unit are both turned on.
JP 2000-278227 A

  By the way, in the above-described wireless relay amplification device, the downlink variable gain amplification unit and the uplink variable gain amplification unit (hereinafter collectively referred to as the variable gain amplification unit) generate noise. In the variable gain amplifying unit, the gain value obtained by the control unit 5 is set regardless of whether or not a signal is input. For this reason, the generated noise is amplified and output with this gain value, and the downlink signal and the uplink signal amplified by these are transmitted with such noise superimposed. When a downstream signal or upstream signal is supplied and amplified, the noise applied to the downstream signal or upstream signal is sufficiently low, so this is not a problem for each, but the downstream signal or upstream signal is supplied. If not, only the noise is output from the variable gain amplifier and transmitted.

  Even if no downlink signal is supplied to the downlink variable gain amplification unit and only noise is output from the downlink variable gain amplification unit and transmitted to the mobile terminal, the area that can communicate with this wireless relay amplification device, that is, in the cell, Since there is no portable terminal that communicates with this, it does not become a problem for each. However, when no uplink signal is supplied to the uplink variable gain amplifier and only noise is output from the uplink variable gain amplifier, this noise is The base station that has received this signal adds the received noise to the noise generated by itself, and the amount of generated noise is equivalently increased. For this reason, the quality of the signal transmitted from this base station deteriorates.

  On the other hand, in the wireless relay amplification device described in Patent Document 1, it is installed in a building or underground shopping area during a period in which it is not used (that is, when it is installed in a subway station, from the last train time to the first train time). If there are no occupants in the room, the power is turned off for both the downstream variable gain amplifying unit and the upstream variable gain amplifying unit. Generation of noise in the gain amplifying unit can be prevented, and only noise is not transmitted to the base station.

  However, the wireless relay amplification device is installed as described above in an area such as an underground store, an underground mall, a tunnel, etc. where people pass all the time, and based on the timer and schedule data as described in Patent Document 1 above. When a predetermined time zone variable gain amplifying unit, that is, the downlink variable gain amplifying unit and the uplink variable gain amplifying unit are both turned off, the person's portable terminal communicates with the base station at all. For example, even if emergency information such as earthquake information is transmitted from the base station, the mobile terminal is not notified.

  In addition, for a wireless relay amplification device installed in an area where people pass through all the time, such as underground stores, underground shopping streets, tunnels, etc., as in the technology described in Patent Document 1, the same as entrance / exit management means When the power is turned off for both the down variable gain amplifying unit and the up variable gain amplifying unit only when there is no one passing through the area using the means, if a person passes through this area, Both the downlink variable gain amplifying unit and the uplink variable gain amplifying unit of this wireless relay amplification device are switched to the power-on state, and communication between the passer-by's portable terminal and the base station becomes possible.

  However, even if this passerby does not communicate with the base station, the uplink variable gain amplifying unit is kept in a power-on state, and the noise generated by this uplink variable gain amplifying unit is transmitted to the base station. become.

  As described above, although the technique described in Patent Document 1 considers reduction of useless power consumption, no consideration is given to transmission of noise to the base station and communication between the base station and the mobile terminal. .

  An object of the present invention is to solve such a problem and to prevent transmission of noise generated in an uplink variable gain amplifying unit to a base station while ensuring wireless communication from the base station to the mobile terminal. The object is to provide a wireless repeater amplifier.

In order to achieve the above object, the present invention provides:
A first antenna that transmits and receives radio signals to and from one or more base stations; a second antenna that transmits and receives radio signals to and from portable terminals; and a downlink from the base station received by the first antenna A downlink variable gain amplifying unit for amplifying the signal, an uplink variable gain amplifying unit for amplifying the uplink signal received from the mobile terminal received by the second antenna, cell search processing for the downlink signal, and broadcast information for each downlink signal Based on a base station that decodes and detects the reception level of the common pilot channel of each downlink signal, and a base station that minimizes the propagation loss of the difference between the transmission level and the reception level of the common pilot channel in the broadcast information A radio relay amplifying apparatus including a control unit that obtains an optimum gain value and sets the gain value to a downlink variable gain amplifying unit and an uplink variable gain amplifying unit, and is received by a second antenna An uplink receiving unit for detecting the RSSI value of the uplink signal from the mobile terminal, and when the control unit detects that the RSSI value detected by the uplink receiving unit is equal to or greater than a predetermined threshold, When the RSSI value detected by the uplink receiving unit is less than a predetermined threshold, the uplink variable gain amplifying unit is deactivated and the downlink variable gain amplifying unit is always operating. It is.

  The present invention is also received by a first antenna that transmits and receives radio signals to and from one or more base stations, a second antenna that transmits and receives radio signals to and from a mobile terminal, and the first antenna. A downlink variable gain amplifying unit for amplifying a downlink signal from the received base station, an uplink variable gain amplifying unit for amplifying an uplink signal received from the mobile terminal received by the second antenna, a cell search process for the downlink signal, The broadcast information for each signal is decoded, the downlink reception unit for detecting the reception level of the common pilot channel of each downlink signal, and the propagation loss of the difference between the transmission level and the reception level of the common pilot channel in the broadcast information is minimized. A wireless relay amplifying apparatus comprising a control unit that obtains an optimal gain value with reference to a base station and sets a gain value to a downlink variable gain amplifying unit and an uplink variable gain amplifying unit. A timer that repeatedly measures and outputs time information is provided, and when the time according to the time information from the timer is within a predetermined time zone, the control unit disables the uplink variable gain amplifying unit, and the time information from the timer When the time according to is outside the predetermined time zone, the up variable gain amplifying unit is in an operating state, and the down variable gain amplifying unit is always in an operating state.

  The present invention is also received by a first antenna that transmits and receives radio signals to and from one or more base stations, a second antenna that transmits and receives radio signals to and from a mobile terminal, and the first antenna. A downlink variable gain amplifying unit for amplifying a downlink signal from the received base station, an uplink variable gain amplifying unit for amplifying an uplink signal received from the mobile terminal received by the second antenna, a cell search process for the downlink signal, The broadcast information for each signal is decoded, the downlink reception unit for detecting the reception level of the common pilot channel of each downlink signal, and the propagation loss of the difference between the transmission level and the reception level of the common pilot channel in the broadcast information is minimized. In a radio relay amplifying apparatus comprising: a control unit that obtains an optimal gain value with reference to a base station and sets a gain value in a downlink variable gain amplifying unit and an uplink variable gain amplifying unit; An uplink receiving unit that detects an RSSI value of an uplink signal from a portable terminal received by the antenna, and a timer that repeatedly measures time and outputs time information are provided, and the control unit (1) time information from the timer (2) The RSSI value detected by the upstream receiving unit when the time according to the time information from the timer is outside the predetermined time zone, Is equal to or greater than a predetermined threshold, the uplink variable gain amplifying unit is activated, and when the RSSI value detected by the uplink receiving unit is less than a predetermined threshold, the uplink variable gain amplifying unit is deactivated. In addition, the downstream variable gain amplifying unit is always in an operating state.

  According to the present invention, when the uplink signal from the mobile terminal is not received, the uplink variable gain amplifying unit is in an inoperative state, so no noise is generated from the uplink variable gain amplifying unit, and only the noise is transmitted to the base station. In addition, since the downlink variable gain amplifying unit is set to the constantly operating state without being transmitted, communication from the base station to the portable terminal is always possible.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing a first embodiment of a wireless repeater amplification apparatus according to the present invention, in which 11 is an uplink receiver, 12 is a power switch, and parts corresponding to those in FIG. Therefore, duplicate explanations are omitted.

In this figure, the first embodiment is provided with an upstream receiving unit 11 in addition to the configuration of the conventional wireless relay amplification apparatus shown in FIG. Similar to the relay amplifying apparatus, the optimum gain value obtained for the reference base station that minimizes the propagation loss is set in the downlink variable gain amplifying unit 3 and the uplink variable gain amplifying unit 8, and the downlink variable gain amplifying unit 3 is set. Amplifies the downstream signal _SD from the duplexer 2 with this gain value, and the upstream variable gain amplifier 8 amplifies the upstream signal S _U from the duplexer 6 with this gain value. Further controls on / off of the power supply of the uplink variable gain amplifying unit 8 in accordance with the output signal of the uplink receiving unit 11.

The uplink receiving unit 11 detects an RSSI (Received Signal Strength Indicator) of the output signal from the duplexer 6 to the uplink 10 and supplies the detected value (RSSI value) to the control unit 5. The control unit 5 compares the RSSI value supplied from the uplink reception unit 11 with a predetermined threshold value,
When the RSSI value ≧ the threshold, it is determined that the uplink signal S _U from the mobile terminal (not shown) is supplied from the reception of the duplexer 6 to the uplink variable gain amplifier 8 by the antenna 7, the uplink variable gain amplifier The power switch 12 of the unit 8 is turned on. As a result, the upstream variable gain amplifying unit 8 enters the operating state (power on state) when the power source voltage V is applied, and the gain value obtained by the control unit 5 is set and the upstream signal S _U from the duplexer 6 is set. Is amplified by this gain value. As a result, the amplified uplink signal S _U is transmitted from the antenna 1 to a base station (not shown) via the duplexer 2.

On the other hand, the control unit 5 compares the RSSI value supplied from the uplink receiving unit 11 with a predetermined threshold,
When RSSI value <threshold value, the uplink signal S _U from any mobile terminal is determined not to be received by the antenna 7, it turns off the power switch 12 of the uplink variable gain amplifier 8. Thereby, the uplink variable gain amplifying unit 8 enters a non-operating state (power supply off state) in which the power supply voltage V is not applied, does not generate noise, and does not output noise. Therefore, at this time, no noise is transmitted from the antenna 1 to the base station.

In this way, the wireless relay amplification device of the first embodiment is installed in an area where radio waves from a base station such as an underground store, an underground mall, and a tunnel do not reach directly, and communication from a portable terminal in such an area If there is, automatically uplink variable gain amplifier 8 is operated in a power-on state, the uplink signal S _U from the portable terminal is transmitted to the base station is amplified by the uplink variable gain amplifier 8, At this time, the downlink variable gain amplifying unit 3 is in an operating state, and communication between this portable terminal and the base station, and therefore, another portable terminal or the like becomes possible.

Further, when there is no communication from the portable terminal in such an area, the uplink variable gain amplifying unit 8 is automatically turned off and inactive, and no noise is output from the uplink variable gain amplifying unit 8. For this reason, noise is not transmitted from the antenna 1 to the base station. Also at this time, the downlink variable gain amplifying unit 3 is in an operating state, and the downlink signal _SD from the base station is amplified by the downlink variable gain amplifying unit 3 and transmitted from the antenna 7. For this reason, in any time zone, when a passerby or the like is present in this area, the downlink signal _SD transmitted from the antenna 7 can be received by the passerby's portable terminal. In response to this, when this passerby transmits the upstream signal S _U from the mobile terminal, the upstream signal S _U is received by the antenna 7 and amplified by the upstream variable gain amplifying unit 8 as described above. 1 to the base station. Accordingly, in any time zone, this mobile terminal can communicate with this base station, and therefore other mobile terminals, in response to the downlink signal _SD from the base station. Of course, this passers side, by transmitting an uplink signal S _U in the mobile terminal, the base station, therefore, it is also possible to start the communication with such another portable terminal.

  FIG. 2 is a block diagram showing a second embodiment of the wireless relay amplifying apparatus according to the present invention. Reference numeral 13 denotes a timer, and parts corresponding to those in the previous drawings are given the same reference numerals and redundant description is omitted. To do.

  In the figure, the second embodiment uses a timer 13 instead of the upstream receiving unit 11 in the first embodiment shown in FIG. 1, and the control unit 5 outputs the output information of the timer 13. On / off control of the power switch 12 is performed based on (time information). Other configurations and operations are the same as those of the first embodiment shown in FIG.

  The timer 13 repeatedly measures the time from 00 o'clock to 24 o'clock, and supplies time information of the measurement result to the control unit 5. A predetermined time zone (hereinafter referred to as a predetermined time zone) is set in the control unit 5, and in this predetermined time zone, the power switch 12 of the uplink variable gain amplifying unit 8 is turned off, and other than this predetermined time zone. In a time zone (hereinafter referred to as a non-predetermined time zone), a control signal for turning on the power switch 12 (hereinafter referred to as a power control signal) is output. For example, when the wireless relay amplification apparatus according to the second embodiment is installed in a store or an underground shopping area, the opening time period of each store or the underground shopping center is from 10:00 to 20:00. Assuming that the closed time zone is from 12:00 to 9:00 on the next day with a margin of about 1 hour, the above-mentioned predetermined time zone is set from 21:00 to 9:00 on the next day, The period from 9 o'clock to 21 o'clock is set as the predetermined outside time zone.

Therefore, in this case, if the time information from the timer 13 represents 21:00, the control unit 5 determines that the predetermined time zone has been entered, and switches the power switch that was in the on state to the off state. As a result, the up variable gain amplifying unit 8 enters a non-operating state in which the power supply voltage V is not applied, does not generate noise, and does not output noise. Therefore, at this time, no noise is transmitted from the antenna 1 to the base station. After that, when the time information from the timer 13 represents 9:00, the control unit 5 determines that the predetermined time period has ended and has entered the non-predetermined time period, and switches the power switch in the off state to the on state. Thus, the uplink variable gain amplifier 8 is an operational state in which the power supply voltage V is applied, is set above the gain value determined by the control unit 5, the uplink signal S _U received by the antenna 7 Amplification is performed using the gain value, and the antenna 1 can be transmitted to the base station.

The downlink variable gain amplifying unit 3 is in a state where the gain value from the control unit 5 is set and the downlink signal _SD received by the antenna 1 is amplified regardless of the predetermined time zone and the non-predetermined time zone.

  As described above, in the second embodiment, the uplink variable gain amplifying unit 8 is turned off and turned off in a predetermined time period when there is no person in the area where the radio wave from the base station is difficult to reach and the portable terminal is not used. As a result, no noise is generated in the uplink variable gain amplifying unit 8 during this predetermined time period, and no noise is transmitted from the antenna 1 to the base station.

In addition, since the downlink variable gain amplifying unit 3 is in an operation state capable of amplifying the downlink signal _{SD even} in this predetermined time zone, a passerby or the like in an area related to this predetermined time zone can also use the mobile terminal from the base station. It is possible to receive the downstream signal _SD . Accordingly, the base station during this time, for example, or downstream signal S _D of the emergency information is transmitted, when a downlink signal S _D from such families and friends has or is transmitted, portable such downlink signal S _D terminal Can be received. In this case, it is impossible to transmit from this portable terminal in this area, but it is possible to respond to this received downlink signal _SD by going out of this area. That is, communication (downstream signal S _D ) from another mobile terminal can be detected, and therefore it is possible to cope with this.

  FIG. 3 is a block diagram showing a third embodiment of the wireless relay amplifying apparatus according to the present invention. The parts corresponding to those in the previous drawings are given the same reference numerals and redundant description is omitted.

  In the figure, the third embodiment is obtained by adding the timer 13 in FIG. 2 to the first embodiment shown in FIG.

  Similarly to the second embodiment shown in FIG. 2, the timer 13 repeatedly measures the time from 00 to 24:00 and supplies the time information to the control unit 5. Similarly to the second embodiment, the control unit 5 determines whether it is a predetermined time zone or a non-predetermined time zone based on this time information. When the power switch 12 is turned off and the upstream variable gain amplifying unit 8 is deactivated and it is determined that the time is outside the predetermined time zone, the power switch 12 is turned on / off by comparing the RSSI value from the upstream receiving unit 11 with a threshold value Prioritize results. When it is determined that the predetermined time period has been reached, the control unit 5 gives priority to the time information from the timer 13, and turns off the power switch 12 regardless of the comparison result between the RSSI value from the upstream reception unit 11 and the threshold value. The upstream variable gain amplifying unit 8 is set to a non-operating state.

Therefore, in the non-predetermined time zone, the control unit 5 determines this time zone from the time information from the timer 13, and is detected by the uplink reception unit 11 when the uplink signal _SU is not received from the antenna 7. Since the RSSI value is less than the threshold value, the power switch 12 is turned off and the upstream variable gain amplifying unit 8 is maintained in a non-operating state. As a result, no noise is output from the uplink variable gain amplifying unit 8, and no noise is transmitted from the antenna 1 to the base station. When the uplink signal S _U is received from the mobile terminal by the antenna 7 and the RSSI value detected by the uplink receiving unit 11 rises and becomes equal to or higher than the threshold value, the power switch 12 is switched to the on state and the uplink variable gain amplifying unit 8 is turned on. Put into operation. As a result, the received uplink signal _SU is amplified by the uplink variable gain amplifying unit 8 and transmitted from the antenna 1 to the base station.

In such a non-predetermined time zone, the downlink variable gain amplifying unit 3 is also maintained in the operating state, so that the downlink signal _SD received from the base station received by the antenna 1 is amplified by the downlink variable gain amplifying unit 3. , Transmitted from the antenna 7 to the portable terminal. Thereby, bidirectional communication is possible between the mobile terminal and the base station.

On the other hand, when the predetermined time zone is reached, the control unit 5 determines from the time information from the timer 13 that it is this time zone, and turns off the power switch 12 to switch the upstream variable gain amplification unit 8 to the non-operational state. . This non-operating state is maintained even when the uplink signal S _U from the mobile terminal is received by the antenna 7 and the RSSI value detected by the uplink receiving unit 11 is equal to or greater than the threshold value. For this reason, in this predetermined time zone, no noise is output from the uplink variable gain amplifying unit 8, and no noise is transmitted from the antenna 1 to the base station.

However, since the downlink variable gain amplifying unit 3 is maintained in the operating state even during the predetermined time period, the downlink signal _SD received from the base station by the antenna 1 is amplified by the downlink variable gain amplifying unit 3. And transmitted from the antenna 7 to the portable terminal. This makes it possible to transmit desired information from, for example, emergency information or an acquaintance to the mobile terminal from the base station.

  As described above, also in the third embodiment, the same effect as in the first and second embodiments can be obtained.

1 is a block configuration diagram showing a first embodiment of a wireless relay amplification apparatus according to the present invention. It is a block block diagram which shows 2nd Embodiment of the radio relay amplification apparatus by this invention. It is a block block diagram which shows 3rd Embodiment of the radio relay amplification apparatus by this invention. It is a block block diagram which shows one prior art example of a radio relay amplifier.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Antenna 2 Duplexer 3 Downlink variable gain amplification part 4 Downlink reception part 5 Control part 6 Duplexer 7 Antenna 8 Uplink variable gain amplification part 9 Downlink 10 Uplink 11 Uplink reception part 12 Power switch 13 Timer

Claims (1)

A first antenna that transmits and receives radio signals to and from one or more base stations;
A second antenna that transmits and receives radio signals to and from the mobile terminal;
A downlink variable gain amplifier for amplifying a downlink signal from the base station received by the first antenna;
An uplink variable gain amplifying unit for amplifying an uplink signal from the mobile terminal received by the second antenna;
The downlink signal is subjected to cell search processing, broadcast information for each downlink signal is decoded, a downlink reception unit that detects a reception level of the common pilot channel of each downlink signal, and the common pilot channel of the broadcast information An optimum gain value is obtained with reference to the base station that minimizes the propagation loss of the difference between the transmission level and the reception level, and the gain value is set in the downlink variable gain amplification unit and the uplink variable gain amplification unit. In a wireless relay amplification device including a control unit,
An uplink receiving unit for detecting an RSSI value of an uplink signal from the mobile terminal received by the second antenna;
The control unit
When the RSSI value detected by the uplink receiving unit is equal to or greater than a predetermined threshold, the uplink variable gain amplifying unit is set in an operating state,
When the RSSI value detected by the uplink receiving unit is less than a predetermined threshold, the uplink variable gain amplifying unit is deactivated,
A radio relay amplifying apparatus characterized in that the downlink variable gain amplifying unit is always in an operating state.

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