JP2008205576A - Radio relay amplifier - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To protect an amplifier section for amplifying upstream transmission power without interrupting a communication network. <P>SOLUTION: A radio relay amplifier has a radio wave detecting section 9 for calculating a mean power value 11 of an upstream transmission signal to be inputted into an amplifier section 7; a variable attenuation section 8 for attenuating the power of the upstream transmission signal having the power amplified by the amplifier section 7, using an attenuation value corresponding to the inputted control signal 12; and a determining section 10 for comparing the mean power value 11 calculated in the radio wave detecting section 9 with the limit value of the power of the upstream transmission signal to be inputtable into the amplifier section 7, outputting the control signal 12 having the attenuation value to be a predetermined set value to the variable attenuation section 8 if the mean power value 11 is below the limit value, and outputting the control signal 12 having an attenuation value smaller than the set value by a difference between the mean power value 11 and the limit value to the variable attenuation section 8 if the mean power value 11 is larger than the limit value. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a radio relay amplifying device used in a code division multiplexing communication network, and more particularly to over-input protection of an uplink amplifying unit used inside the radio relay amplifying device.

  Conventionally, in a radio relay amplification apparatus used in a code division multiplexing communication network, transmission is performed for each of uplink transmission from a mobile terminal to a base station apparatus and downlink transmission from the base station apparatus to the mobile terminal. An amplifying unit is provided to amplify the power. Among them, the amplifying unit for amplifying transmission power in uplink transmission from the mobile terminal to the base station apparatus amplifies by increasing the number of mobile terminals that communicate with the base station apparatus via the wireless relay amplification apparatus. Since the transmission power input to the unit may increase, it needs to be protected.

In order to protect the amplification unit for amplifying the uplink transmission power, conventionally, the power input to the amplification unit is monitored, and when the input power exceeds the reference power value, the signal input to the amplification unit Are interrupted or the function of the amplifying unit is stopped (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 10-271054

  However, as described above, in order to protect the amplification unit for amplifying the uplink transmission power, when the power input to the amplification unit exceeds the reference power value, the signal input to the amplification unit is blocked. In the case where the function of the amplification unit is stopped, the communication network is disconnected.

  The present invention has been made in view of the problems of the conventional techniques as described above, and is capable of protecting an amplifying unit for amplifying uplink transmission power without disconnecting a communication network. It is an object of the present invention to provide a relay amplification device.

In order to achieve the above object, the present invention provides:
An amplifying unit that amplifies transmission power in uplink transmission from the mobile terminal to the base station apparatus, receives a transmission signal transmitted from the mobile terminal, and amplifies the transmission signal by the amplification unit In the wireless relay amplification device that transmits to the base station device,
Amplifying control means is provided for controlling the degree of amplification of the transmission signal using the amplification unit based on the power of the received transmission signal.

  In the present invention configured as described above, when the transmission signal transmitted from the mobile terminal is received by the wireless relay amplification device, the power of the received transmission signal is received by the amplification unit in the wireless relay amplification device. A transmission signal that has been amplified and amplified in power is transmitted to the base station apparatus. At that time, in the amplification control means in the wireless relay amplification apparatus, the amplification unit is based on the power of the received transmission signal. The degree of amplification of the transmission signal using is controlled. Here, in the code division multiplexing communication network, in order to avoid interference between transmission and reception power caused by a difference in distance between the base station apparatus and the mobile terminal, a reference reception SIR is set, and a high-precision so as to lead to the reference value is set. Power control is being implemented. Therefore, as described above, by monitoring the power of the received transmission signal and controlling the degree of amplification of the transmission signal using the amplification unit based on the power, the SIR is made higher for the base station apparatus. The power of the transmission signal input to the wireless repeater amplifier is reduced by the power control function of the code division multiplexing network itself. As a result, the communication network is not disconnected.

  As described above, in the present invention, by utilizing power control performed between a base station and a terminal in a code division multiplexing communication system network, a radio relay amplification apparatus can amplify transmission power in uplink transmission. The amplification unit can be protected without disconnecting the communication network.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a diagram showing an embodiment of a wireless relay amplification apparatus according to the present invention.

  In this embodiment, as shown in FIG. 1, an outdoor antenna 1 serving as a radio interface with a base station apparatus, a shared filter 2 for enabling the outdoor antenna 1 to transmit and receive, and transmission from the base station apparatus to a mobile terminal (Hereinafter referred to as downlink transmission) amplifying section 3 for amplifying transmission power, indoor antenna 5 serving as a radio interface with the mobile terminal, shared filter 4 for enabling indoor antenna 5 to transmit and receive, and mobile terminal To a base station apparatus (hereinafter referred to as uplink transmission), a distributor 6 that distributes transmission power, an amplifying unit 7 that amplifies transmission power in uplink transmission, and a variable transmission power attenuation amount in uplink transmission Variable attenuating unit 8, power detector 9, which is an average value calculating means for calculating the average power value of transmission power in uplink transmission, and attenuation in variable attenuating unit 8. And a determination unit 10 for outputting a control signal 12 for Gosuru. The variable attenuation unit 8, the power detection unit 9, and the determination unit 10 constitute the amplification control means of the present invention. In this embodiment, the amplification unit 7 that amplifies the power of the uplink transmission signal 13 is a target to be protected.

  Hereinafter, the operation of the radio relay amplifying apparatus configured as described above will be described.

  When the uplink transmission signal transmitted from the mobile terminal to the base station apparatus is received by the indoor antenna 5, the uplink transmission signal and the downlink transmission signal are separated by the shared filter 4, and the uplink transmission signal 13 is distributed by the distributor. 6 is supplied.

  In the distributor 6, the uplink transmission signal 13 supplied from the shared filter 4 passes through the uplink transmission signal transmitted to the base station apparatus via the amplification unit 7, the power detection unit 9 and the determination unit 10, By controlling the variable attenuating unit 8, it is separated into an uplink transmission signal used for protecting the amplifying unit 7.

  One of the uplink transmission signals separated by the distributor 6 is input to the amplifying unit 7, and its power is amplified by the gain set by the amplifying unit 7. Is output.

  On the other hand, the other uplink transmission signal among the uplink transmission signals separated by the distributor 6 is input to the power detection unit 9, and the power detection unit 9 integrates the power of the input uplink transmission signal. The average power value 11 of the uplink transmission signal 13 received by the indoor antenna 5 and input to the amplification unit 7 is calculated and output to the determination unit 10.

  The determination unit 10 sets an attenuation value for attenuating the power of the uplink transmission signal amplified by the amplification unit 7 in the variable attenuation unit 8 based on the average power value 11 output from the power detection unit 9. A control signal 12 is generated and output.

  Below, the process in the determination part 10 is demonstrated in detail.

  In the determination unit 10, a reference value S that is a limit value of the power of the uplink transmission signal 13 that can be input to the amplification unit 7 is set, and the average power value calculated by the reference value S and the power detection unit 9. 11 and a control signal 12 for setting an attenuation value in the variable attenuator unit 8 is generated and output based on the comparison result. When the comparison result between the reference value S and the average power value 11 is the average power value 11 ≦ the reference value S, the attenuation value in the variable attenuator unit 8 is a fixed attenuation value C that is a predetermined set value. Such a control signal 12 is output from the determination unit 10 to the variable attenuation unit 8. When the comparison result between the reference value S and the average power value 11 is that the average power value 11> the reference value S, the attenuation value in the variable attenuation unit 8 is equal to (average power value 11−reference value S). A control signal 12 that is subtracted from the attenuation value C is output from the determination unit 10 to the variable attenuation unit 8. That is, in the variable attenuation unit 8, the attenuation value is controlled only when the average power value 11 calculated by the power detection unit 9 exceeds the reference value S.

  In the variable attenuating unit 8, the uplink transmission signal output after the power is amplified by the amplifying unit 7 is attenuated by the attenuation value corresponding to the control signal 12 output from the determining unit 10 and output to the shared filter 2. The

  Thereafter, in the shared filter 2, the uplink transmission signal and the downlink transmission signal are combined into one radio wave transmission path, and the uplink transmission signal is transmitted to the base station apparatus via the outdoor antenna 1.

  A specific operation of the above-described wireless relay amplification apparatus in the code division multiplexing communication network will be described below.

  FIG. 2 is a diagram illustrating an example of a code division multiplexing communication network using the wireless relay amplification apparatus illustrated in FIG.

  In the code division multiplexing communication network shown in FIG. 2, amplification in the radio relay amplifying apparatus 200 due to some factors such as an increase in the number of mobile terminals 300 that communicate with the base station apparatus 100 via the radio relay amplifying apparatus 200. When the power of the uplink transmission signal input to the unit 7 exceeds the reference value S, the attenuation amount of the variable attenuation unit 8 is reduced by a weight corresponding to (average power value 11−reference value S), and the base station apparatus 100 On the other hand, the uplink transmission power of the mobile terminal 300 communicating via the wireless relay amplification device 200 is shown high. Then, in order to avoid interference with other mobile terminals in the service area, the base station apparatus 100 reduces the uplink transmission power with respect to the mobile terminal 300 that performs communication via the radio relay amplification apparatus 200. To request. As a result, the uplink transmission power input to the amplification unit 7 in the wireless relay amplification apparatus 200 is reduced.

(Other embodiments)
As another embodiment of the present invention, the basic configuration is the same as that shown in the above-described embodiment, but the amplification unit 7 includes a power detection unit 9, a determination unit 10, and a variable attenuation unit 8. The same effect can be obtained even if it is arranged after the loop. In that case, the variable attenuating unit 8 attenuates the power of the uplink transmission signal 13 received by the indoor antenna 5 and distributed by the distributor 6, and the amplifying unit 7 attenuates the uplink transmission attenuated by the variable attenuating unit 8. The power of the signal 13 is amplified with a predetermined gain.

  Further, when the amplification unit 7 has a gain control function, the same effect can be obtained even if the control signal 12 output from the determination unit 10 is input to the amplification unit 7 and the variable attenuation unit 8 is omitted. It is done. In that case, when the comparison result between the reference value S and the average power value 11 is the average power value 11 ≦ the reference value S, the determination unit 10 sets the gain in the amplification unit 7 to a predetermined setting value. When the comparison result between the reference value S and the average power value 11 is the average power value 11> the reference value S, the gain in the amplification unit 7 is (average power). A control signal that is added to the set value by the value 11−reference value S) is output to the amplifying unit 7.

  Note that the present invention is not limited to the above-described embodiment, and it is obvious that each embodiment can be appropriately changed within the scope of the technical idea of the present invention.

It is a figure which shows one Embodiment of the wireless relay amplification apparatus of this invention. It is a figure which shows an example of the code division multiplexing system communication network using the radio | wireless relay amplification apparatus shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outdoor antenna 2, 4 Shared filter 3, 7 Amplification part 5 Indoor antenna 6 Divider 8 Variable attenuation part 9 Power detection part 10 Judgment part 11 Average power value 12 Control signal 13 Uplink transmission signal 14 Downlink transmission signal 100 Base station apparatus 200 Wireless repeater amplifier 300 Mobile terminal

Claims (4)

An amplifying unit that amplifies transmission power in uplink transmission from the mobile terminal to the base station apparatus, receives a transmission signal transmitted from the mobile terminal, and amplifies the transmission signal by the amplification unit In the wireless relay amplification device that transmits to the base station device,
A radio relay amplification apparatus comprising amplification control means for controlling the degree of amplification of the transmission signal using the amplification unit based on the power of the received transmission signal. In the wireless relay amplification device according to claim 1,
The amplification control means includes
Average value calculating means for calculating an average value of transmission signals input to the amplifying unit;
Variable attenuation means for attenuating the power of the transmission signal amplified by the amplifying unit with an attenuation value corresponding to the input control signal;
The average value calculated by the average value calculating means is compared with the limit value of the power of the transmission signal that can be input to the amplifying unit, and when the average value is less than or equal to the limit value, the attenuation value is A control signal that is a predetermined set value is output to the variable attenuation unit, and when the average value is larger than the limit value, the attenuation value is the difference between the average value and the limit value. And a determination unit that outputs a control signal that is smaller than a set value to the variable attenuation unit. In the wireless relay amplification device according to claim 1,
The amplification control means includes
Average value calculating means for calculating an average value of the received transmission signals;
Variable attenuation means for attenuating the power of the received transmission signal by an attenuation value corresponding to the input control signal, and outputting the transmission signal with attenuated power to the amplifying unit;
The average value calculated by the average value calculating means is compared with the limit value of the power of the transmission signal that can be input to the amplifying unit, and when the average value is less than or equal to the limit value, the attenuation value is A control signal that is a predetermined set value is output to the variable attenuation unit, and when the average value is larger than the limit value, the attenuation value is the difference between the average value and the limit value. And a determination unit that outputs a control signal that is smaller than a set value to the variable attenuation unit. In the wireless relay amplification device according to claim 1,
The amplifying unit has a gain control function for controlling a gain according to an input control signal;
The amplification control means includes
Average value calculating means for calculating an average value of transmission signals input to the amplifying unit;
The average value calculated by the average value calculating means is compared with the limit value of the power of the transmission signal that can be input to the amplification unit. When the average value is equal to or less than the limit value, the gain is previously When the control signal is output to the amplifying unit so that the set value is determined, and the average value is larger than the limit value, the gain is greater than the set value by the difference between the average value and the limit value. And a determination unit that outputs a control signal that increases to the amplification unit.

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