JP2012085146A - Communication device, circuit component, and transmission power control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress transmission power of a communication device having a plurality of communication units.SOLUTION: A communication device 1 comprises a communication unit 11, a communication unit 12, and a transmission path 13. The communication unit 11 comprises a detection unit 117 for detecting a power level of an input signal, and a baseband circuit 118 for controlling transmission power of the communication unit 11 on the basis of a detection result of the detection unit 117. The communication unit 12 comprises a detection unit 127 for detecting a power level of an input signal, and a baseband circuit 128 for controlling transmission power of the communication unit 12 on the basis of a detection result of the detection unit 127. The transmission path 13 branches the signal input to the detection unit 127, and the branched signal is input to the detection unit 117.

Description

  The present invention relates to a communication device, a circuit component, and a transmission power control method.

  In a communication device such as a wireless communication device, auto power control (feedback control) is used to control transmission power. The auto power control is realized by detecting and feeding back the power level of the transmission signal and adjusting the output of the transmission signal based on the fed back power level (see, for example, Patent Document 1).

JP 2006-333168 A

  The communication device may include a plurality of communication units for reasons such as transmitting and receiving signals having different frequencies. When the communication device includes a plurality of communication units as described above, if each communication unit independently performs auto power control, the transmission power increases when the plurality of communication units simultaneously execute transmission processing. .

  The present invention has been made in view of the above, and an object thereof is to provide a communication device, a circuit component, and a transmission power control method capable of suppressing transmission power.

  In order to solve the above-described problems and achieve the object, the present invention provides a communication device, a first detection unit that detects a power level of an input signal, and a detection result of the first detection unit. A first communication unit having a first control unit that feedback-controls transmission power based on the second detection unit, a second detection unit that detects a power level of an input signal, and a detection result of the second detection unit A second communication unit that has a second control unit that controls transmission power based on the signal, and a signal input to the second detection unit is branched, and the branched signal is sent to the first detection unit. And a transmission path for input.

  Here, it is preferable that the transmission path includes a signal insulator that prevents a signal input to the first detection unit from being transmitted to the second detection unit.

  Moreover, it is preferable that the transmission path further branches a signal input to the first detection unit, and inputs the branched signal to the second detection unit.

  Further, the transmission path branches the signal input to the second detection unit, and inputs the branched signal to the first detection unit, or the signal input to the first detection unit. It is preferable to have a switch that switches whether to branch and input the branched signal to the second detection unit.

  Further, the first communication unit includes a first antenna that radiates a radio signal, a first output unit that outputs a transmission signal toward the first antenna, and the first output unit from the first output unit. A first signal extraction unit that extracts a part of the transmission signal output toward one antenna and inputs the extracted signal to the first detection unit, and the second communication unit includes a radio signal , A second output unit that outputs a transmission signal toward the second antenna, and the transmission signal that is output from the second output unit toward the second antenna A second signal extraction unit that extracts a part of the transmission signal and inputs the extracted signal to the second detection unit, and the transmission path is a part of the transmission signal extracted by the second signal extraction unit It is preferable to branch the signal and input the branched signal to the first detection unit. .

  In order to solve the above-described problem and achieve the object, the present invention provides a first control for feedback control of transmission power based on a detection result of a first detection unit that detects a power level of an input signal. A first communication unit having a control unit; and a second communication unit having a second control unit that controls transmission power based on a detection result of a second detection unit that detects a power level of an input signal; A circuit component used in a communication apparatus comprising: a transmission path that branches a signal input to the second detection unit and inputs the branched signal to the first detection unit. To do.

  In order to solve the above-described problems and achieve the object, the present invention provides a transmission power control method executed by a communication apparatus including a first communication unit and a second communication unit, A step of controlling the transmission power of the second communication unit based on the detection result of the power level of the transmission signal output from the second communication unit, and a part of the transmission signal output from the second communication unit. And transmitting to the first communication unit, and based on a detection result of a power level of the transmission signal output from the first communication unit and the transmission signal transmitted from the second communication unit. And a step of controlling the transmission power of the communication unit.

  The communication device, the circuit component, and the transmission power control method according to the present invention have an effect that transmission power can be suppressed.

FIG. 1 is a block diagram illustrating a functional configuration of the communication apparatus according to the first embodiment. FIG. 2 is a sequence diagram illustrating the operation of the communication apparatus when two communication units transmit signals simultaneously. FIG. 3 is a block diagram illustrating a functional configuration of the communication apparatus according to the second embodiment. FIG. 4 is a block diagram illustrating a functional configuration of the communication apparatus according to the third embodiment. FIG. 5 is a diagram illustrating an example in which a part of the configuration of the communication apparatus illustrated in FIG. 1 is integrated as an integrated circuit.

  Hereinafter, the present invention will be described in detail with reference to the drawings. The present invention is not limited to the following description. In addition, constituent elements in the following description include those that can be easily assumed by those skilled in the art, those that are substantially the same, and those in a so-called equivalent range. In addition, the communication device shown in each of the following embodiments is a device having a function of transmitting a signal, and is combined with, for example, a mobile phone terminal, a PHS (Personal Handyphone System), a personal computer with a built-in communication function, a personal computer, etc. Correspond to a communication module, modem, router device, etc.

(Embodiment 1)
First, a functional configuration of a communication apparatus 1 that is an embodiment of a communication apparatus according to the present invention will be described with reference to FIG. FIG. 1 is a block diagram illustrating a functional configuration of the communication device 1. In FIG. 1, for the sake of simplicity, illustration of a configuration related to signal reception and the like is omitted.

  As illustrated in FIG. 1, the communication device 1 includes a communication unit 11 that is a first communication unit, a communication unit 12 that is a second communication unit, and a transmission path 13. The communication part 11 and the communication part 12 operate | move independently, and may transmit a signal simultaneously. In the present embodiment, the communication unit 11 performs wireless communication for data transmission based on LTE (Long Term Evolution), and the communication unit 12 performs wireless communication for a call based on CDMA (Code Division Multiple Access). Shall be performed.

  The communication unit 11 includes an antenna 111, a modulation unit 112 and an amplification unit 113, which are output units of transmission signals, a directional coupler (signal extraction unit) 114, a resistor 115, a branch / coupler 116, and a detection unit. 117 and a baseband circuit (BB circuit) 118. The antenna 111 converts a transmission signal into a radio signal and radiates it. Modulation section 112 modulates the transmission signal and outputs it to antenna 111. The amplification unit 113 amplifies the transmission signal output from the modulation unit 112.

  The directional coupler 114 sends out the transmission signal amplified by the amplification unit 113 to the antenna 111, extracts a part of the transmission signal (part of the combined power), and transmits it to the detection unit 117. In addition, the directional coupler 114 extracts a part of the reflected wave from the antenna 111 and transmits it to the resistor 115. The resistor 115 consumes the reflected wave extracted by the directional coupler 114.

  The branch / combiner 116 superimposes the signal transmitted from the directional coupler 114 toward the detection unit 117 and the signal transmitted from the communication unit 12 via the transmission path 13 toward the detection unit 117. To send. As a result, the power level of the signal transmitted toward the detection unit 117 is a value obtained by adding the power level of the signal transmitted from the directional coupler 114 and the power level of the signal transmitted from the communication unit 12. Become.

  The detection unit 117 detects the power level of the input signal. The baseband circuit 118 is a control unit that performs various processes such as encoding of transmission data. Based on the detection result of the detection unit 117, the baseband circuit 118, as a part of various processes, the transmission power of the communication unit 11 does not exceed the maximum transmission power. Both of the output levels are adjusted (in the following description, it is assumed that the output level of the modulation unit 112 is adjusted).

  The communication unit 12 includes an antenna 121, a modulation unit 122 and an amplification unit 123 that are output units of transmission signals, a directional coupler 124, a resistor 125, a branch / coupler 126, a detection unit 127, a baseband Circuit 128. The antenna 121 converts a transmission signal into a radio signal and radiates it. Modulation section 122 modulates the transmission signal and outputs it to antenna 121. The amplification unit 123 amplifies the transmission signal output from the modulation unit 122.

  The directional coupler 124 sends out the transmission signal amplified by the amplifying unit 123 to the antenna 121, extracts a part of the transmission signal (part of the combined power), and transmits it to the detection unit 127. In addition, the directional coupler 124 extracts a part of the reflected wave from the antenna 121 and transmits it to the resistor 125. The resistor 125 consumes the reflected wave extracted by the directional coupler 124.

  The branch / combiner 126 branches the signal transmitted from the directional coupler 124 toward the detection unit 127, transmits one of the branched signals toward the detection unit 127, and transmits the other via the transmission path 13. It transmits toward the detection part 117.

  The detection unit 127 detects the power level of the input signal. The baseband circuit 128 is a control unit that performs various processes such as encoding of transmission data. Based on the detection result of the detection unit 127, the baseband circuit 128, as a part of various processes, the transmission power of the communication unit 12 does not exceed the maximum transmission power. Both of the output levels are adjusted (in the following description, it is assumed that the output level of the modulation unit 122 is adjusted).

  The transmission path 13 transmits one of the signals branched by the branch / combiner 126 of the communication unit 12 to the branch / combiner 116 of the communication unit 11. A signal insulator (isolator) 14 provided in the transmission path 13 prevents a signal from being transmitted from the communication unit 11 side to the communication unit 12 side.

  As described above, in the communication device 1, a part of the transmission signal of the communication unit 12 is transmitted to the communication unit 11 via the transmission path 13, and the detection unit 117 of the communication unit 11 is a part of the transmission signal of the communication unit 11. And a voltage level of a signal in which a part of the transmission signal of the communication unit 12 is superimposed is detected. For this reason, when the state of the communication unit 12 is reflected in the auto power control of the communication unit 11 and the transmission power of the communication unit 12 becomes high, the output is adjusted so that the transmission power of the communication unit 11 becomes low. . As a result, the transmission power of the entire communication device 1 is suppressed.

  Such suppression of transmission power is realized without modifying the functions of the baseband circuit 118 and the baseband circuit 128. The baseband circuit 118 and the baseband circuit 128 have complicated functions, and the functions may be mounted in different mounting methods by different vendors. Therefore, suppressing transmission power without modifying these functions contributes to shortening the development period of the communication device 1 and suppressing development costs.

  Moreover, in a portable communication device that operates with power stored in a rechargeable battery, it is very important to suppress transmission power in order to ensure sufficient communication time.

  Here, the auto power control in the communication apparatus 1 will be described with a specific example. For example, it is assumed that the maximum transmission power of the communication unit 11 is defined as +23.0 dBm, the coupling amount of the directional coupler 114 is 20 dB, and the insertion loss of the branching / coupler 116 is 3 dB. In this case, the baseband circuit 118 of the communication unit 11 adjusts the output level of the modulation unit 122 so that the power level detected by the detection unit 117 does not exceed +23 dBm−20 dB−3 dB = 0 dBm, that is, 0 dBm.

  Further, it is assumed that the maximum transmission power of the communication unit 12 is defined as +23.0 dBm, the coupling amount of the directional coupler 124 is 20 dB, and the insertion loss of the branching / combining unit 126 is 3 dB.

  Assuming that the specifications of the communication unit 11 and the communication unit 12 are as described above, consider a case where the communication unit 12 performs transmission at +23.0 dBm, which is the maximum transmission power. In this case, +23 dBm−20 dB−3 dB−3 dB = −3 dBm, that is, −3 dBm power is input to the detection unit 117 of the communication unit 11 via the transmission path 13. As a result, since (−3 dBm) + (− 3 dBm) ≈0 dBm, the baseband circuit 118 allows the modulation unit 122 to prevent the current input to the detection unit 117 via the directional coupler 114 from exceeding −3 dBm. Will adjust the output level. This means that since +20 dBm−20 dB−3 dB = −3 dBm, the maximum transmission power of the communication unit 11 is suppressed to 20 dBm.

  Thus, by transmitting a part of the transmission signal of the communication unit 12 to the communication unit 11 via the transmission path 13, in this example, when the communication unit 12 is transmitting a signal, the maximum of the communication unit 11 is transmitted. The transmission power can be reduced from 23 dBm to 20 dBm.

  In this example, the baseband circuit 128 of the communication unit 12 adjusts the output level of the modulation unit 122 so that the power level detected by the detection unit 127 does not exceed +23 dBm-20 dB-3 dB = 0 dBm, that is, 0 dBm. And is not affected by the situation of the communication unit 11. That is, the communication unit 12 exhibits a predetermined performance by transmitting a signal within a range not exceeding the predetermined maximum transmission power regardless of the state of the communication unit 11. As described above, in the present embodiment, since the communication unit 12 performs wireless communication for a call, it is important to ensure the performance of the communication unit 12 in order to avoid problems such as voice interruption. ing. On the other hand, since the communication unit 11 performs wireless communication for data transmission, even if the maximum transmission power is suppressed, the possibility of being perceived by the user is low.

  Next, the operation of the communication device 1 when the communication unit 11 and the communication unit 12 transmit signals simultaneously will be described with reference to FIG. FIG. 2 is a sequence diagram illustrating the operation of the communication device 1 when the communication unit 11 and the communication unit 12 transmit signals simultaneously. In FIG. 2, a part of the configuration is omitted to simplify the illustration.

  As illustrated in FIG. 2, the modulation unit 122 of the communication unit 12 performs modulation processing on the transmission signal and outputs it to the antenna 121 in step S <b> 11. The directional coupler 124 sends the transmission signal transmitted from the communication unit 12 to the antenna 121 as step S12. In step S13, the directional coupler 124 extracts a part of the transmission signal and transmits it to the detection unit 127.

  Here, the signal transmitted toward the detection unit 127 is branched by the branch / combiner 126 in step S14, and one of the branched signals is transmitted toward the detection unit 117 via the transmission path 13. .

  In step S15, the detection unit 127 detects the power level of the other signal branched by the branch / combiner 126 and notifies the baseband circuit 128 of the detected power level. In step S <b> 16, the baseband circuit 128 adjusts the output level of the modulation unit 122 based on the detection result of the detection unit 127.

  Further, the modulation unit 112 of the communication unit 11 performs modulation processing on the transmission signal and outputs it to the antenna 111 in step S21. The directional coupler 114 sends the transmission signal transmitted from the modulation unit 112 to the antenna 111 as step S22. In step S23, the directional coupler 114 extracts a part of the transmission signal and transmits it to the detection unit 117.

  In step S <b> 24, the detection unit 117 detects the power level of the signal in which the signal transmitted from the directional coupler 114 and the signal transmitted from the communication unit 12 are superimposed, and notifies the baseband circuit 118. In step S25, the baseband circuit 118 adjusts the output level of the modulation unit 112 based on the detection result of the detection unit 117.

  Hereinafter, while the communication unit 11 and the communication unit 12 transmit signals simultaneously, the same processing is repeatedly performed.

  As described above, the communication device 1 according to the present embodiment transmits a part of the transmission signal of the communication unit 12 to the communication unit 11 via the transmission path 13, and the detection unit 117 of the communication unit 11 A voltage level of a signal in which a part of the transmission signal and a part of the transmission signal of the communication unit 12 are superimposed is detected. For this reason, the status of the communication unit 12 is reflected in the auto power control of the communication unit 11, and the transmission power of the entire communication device 1 is suppressed.

(Embodiment 2)
In the first embodiment, the signal transmission state is unilaterally transmitted from one communication unit to the other communication unit. However, the transmission state may be transmitted bidirectionally. In this embodiment, an example in which the transmission status is transmitted in both directions will be described. In the following description, parts that have already been described may be denoted by the same reference numerals as those already described, and redundant description may be omitted.

  A functional configuration of the communication device 2 according to the present embodiment will be described with reference to FIG. FIG. 3 is a block diagram illustrating a functional configuration of the communication device 2. In FIG. 3, for the sake of simplicity, illustration of a configuration related to signal reception and the like is omitted.

  As illustrated in FIG. 3, the communication device 2 includes a communication unit 21 that is a first communication unit, a communication unit 22 that is a second communication unit, and a transmission path 23. The communication part 21 and the communication part 22 operate | move independently, and may transmit a signal simultaneously.

  The communication unit 21 includes an antenna 111, a modulation unit 112, an amplification unit 113, a directional coupler 114, a resistor 115, a branch / coupler 116, a detection unit 117, and a baseband circuit 118. The communication unit 22 includes an antenna 121, a modulation unit 122, an amplification unit 123, a directional coupler 124, a resistor 125, a branch / coupler 126, a detection unit 127, and a baseband circuit 128.

  The transmission path 23 is different from the transmission path 13 shown in FIG. 1 in that the signal insulator 14 is not provided. That is, in the communication device 2, the signal transmitted from the directional coupler 124 of the communication unit 22 to the detection unit 127 is branched by the branch / combiner 126, and one of the branched signals is transmitted to the transmission path 23 and the branch / The signal is sent to the detection unit 117 of the communication unit 21 via the coupler 116. Further, a signal transmitted from the directional coupler 114 of the communication unit 21 to the detection unit 117 is branched by the branch / combiner 116, and one of the branched signals passes through the transmission path 23 and the branch / coupler 126. And sent to the detection unit 127 of the communication unit 22.

  As described above, in the communication device 2, a part of the transmission signal of the communication unit 22 is transmitted to the detection unit 117 of the communication unit 21 via the transmission path 23, and a part of the transmission signal of the communication unit 21 passes through the transmission path 23. It is transmitted to the detection unit 127 of the communication unit 22 via. For this reason, the status of the communication unit 22 is reflected in the auto power control of the communication unit 21, and the status of the communication unit 21 is reflected in the auto power control of the communication unit 22. That is, when the transmission power of the communication unit 21 increases, the transmission power of the communication unit 22 is suppressed, and when the transmission power of the communication unit 22 increases, the transmission power of the communication unit 21 is suppressed. As a result, the transmission power of the entire communication device 2 is suppressed.

(Embodiment 3)
In the first embodiment, the signal transmission state is unilaterally transmitted from one communication unit to the other communication unit. However, from which communication unit the transmission state is transmitted to which communication unit. It is good also as a structure which can be switched suitably. Therefore, in this embodiment, an example will be described in which the communication state is appropriately switched from which communication unit to which communication unit.

  A functional configuration of the communication device 3 according to the present embodiment will be described with reference to FIG. FIG. 4 is a block diagram illustrating a functional configuration of the communication device 3. In FIG. 4, for the sake of simplicity, illustration of a configuration related to signal reception and the like is omitted.

  As illustrated in FIG. 4, the communication device 3 includes a communication unit 31 that is a first communication unit, a communication unit 32 that is a second communication unit, and a transmission path 33. The communication part 31 and the communication part 32 operate | move independently, and may transmit a signal simultaneously.

  The communication unit 31 includes an antenna 111, a modulation unit 112, an amplification unit 113, a directional coupler 114, a resistor 115, a branch / coupler 116, a detection unit 117, and a baseband circuit 318. The communication unit 32 includes an antenna 121, a modulation unit 122, an amplification unit 123, a directional coupler 124, a resistor 125, a branch / coupler 126, a detection unit 127, and a baseband circuit 128.

  The transmission path 33 is different from the transmission path 13 shown in FIG. 1 in that a signal insulator 34, a signal insulator 35, a switch 36, and a switch 37 are provided in place of the signal insulator 14. To do.

  In the signal isolator 34, a signal transmitted from the directional coupler 114 of the communication unit 31 toward the detection unit 117 is branched by the branch / coupler 116, and one of the branched signals passes through the transmission path 33. Transmission to the communication unit 32 side is suppressed. In the signal insulator 35, a signal transmitted from the directional coupler 124 of the communication unit 32 to the detection unit 127 is branched by the branch / coupler 126, and one of the branched signals passes through the transmission path 33. Transmission to the communication unit 31 side is suppressed.

  The switch 36 and the switch 37 switch which of the signal insulator 34 and the signal insulator 35 is used. When the switch 36 and the switch 37 are switched to the signal insulator 34 side, a part of the transmission signal is transmitted from the communication unit 32 to the communication unit 31, but not transmitted from the communication unit 31 to the communication unit 32. When the switch 36 and the switch 37 are switched to the signal insulator 35 side, a part of the transmission signal is transmitted from the communication unit 31 to the communication unit 32, but is not transmitted from the communication unit 32 to the communication unit 31.

  The baseband circuit 318 has a function of switching the switch 36 and the switch 37 in addition to the function of the baseband circuit 118 illustrated in FIG. By switching the switch 36 and the switch 37 to the signal insulator 34 side, a part of the transmission signal is transmitted from the communication unit 32 to the communication unit 31, and the transmission power of the communication unit 31 is suppressed. By switching the switch 36 and the switch 37 to the signal insulator 35 side, a part of the transmission signal is transmitted from the communication unit 31 to the communication unit 32, and the transmission power of the communication unit 32 is suppressed.

  Switching of the switch 36 and the switch 37 by the baseband circuit 318 may be executed in accordance with a user instruction, or may be autonomously executed by the baseband circuit 318 according to a communication situation. For example, when the communication unit 31 is used for data transmission and the communication unit 32 is used for a call, the switch 36 and the switch 37 are normally switched to the signal insulator 34 side so that communication with high priority is performed. When performed in the unit 31, the switch 36 and the switch 37 may be switched to the signal insulator 35 side. By controlling in this way, it is possible to ensure the quality of data transmission when performing high-priority data transmission by QoS (Quality of Service) control or the like while normally ensuring the quality of a call.

(Other embodiments)
The aspects of the present invention shown in the above embodiments can be arbitrarily changed without departing from the gist of the present invention. For example, in each of the above embodiments, the transmission power is suppressed, but the reception power can also be suppressed by the same configuration. In each of the above embodiments, the communication device that performs wireless communication has been described. However, the present invention can also be applied to a communication device that performs wired communication (for example, an optical transmission device).

  Moreover, although each said embodiment demonstrated the communication apparatus provided with two communication parts, this invention is applicable also to a communication apparatus provided with three or more communication parts. In this case, a transmission path may be provided between all the communication units included in the communication device, or the communication units included in the communication device may be grouped and a transmission path may be provided between the communication units in the same group. .

  In order to increase the effect of suppressing the transmission power, an amplification unit that amplifies the transmission signal to be transmitted may be provided in the transmission path 13, the transmission path 23, or the transmission path 33.

  Further, the whole or a part of the configuration described in each of the above embodiments may be integrated into one component as an integrated circuit. An example in which a part of the configuration of the communication device 1 illustrated in FIG. 1 is integrated as an integrated circuit will be described with reference to FIG. FIG. 5 is a diagram illustrating an example in which a part of the configuration of the communication device 1 illustrated in FIG. 1 is integrated as an integrated circuit.

  The communication device 4 illustrated in FIG. 5 includes a communication unit 41 that is a first communication unit, a communication unit 42 that is a second communication unit, and a relay circuit 43. The communication device 4 is the communication device shown in FIG. 1 except that the branch / combiner 116, the branch / coupler 126, and the signal insulator 14 are integrated as a relay circuit 43 into one integrated circuit. 1 has the same configuration.

  As described above, the communication device, the circuit component, and the transmission power control method according to the present invention are suitable when it is necessary to suppress the transmission power.

1-4 Communication device 11, 12, 21, 22, 31, 32, 41, 42 Communication unit 13, 23, 33 Transmission path 14, 34, 35 Signal insulator 36, 37 Switch 43 Relay circuit 111, 121 Antenna 112, 122 Modulator 113, 123 Amplifier 114, 124 Directional coupler 115, 125 Resistor 116, 126 Coupler 117, 127 Detector 118, 128, 318 Baseband circuit

Claims (7)

A first communication unit having a first detection unit that detects a power level of an input signal, and a first control unit that feedback-controls transmission power based on a detection result of the first detection unit;
A second communication unit including a second detection unit that detects a power level of an input signal, and a second control unit that controls transmission power based on a detection result of the second detection unit;
And a transmission path for branching a signal input to the second detection unit and inputting the branched signal to the first detection unit.   The communication apparatus according to claim 1, wherein the transmission path includes a signal insulator that prevents a signal input to the first detection unit from being transmitted to the second detection unit.   The communication apparatus according to claim 1, wherein the transmission path further branches a signal input to the first detection unit and inputs the branched signal to the second detection unit.   The transmission path branches a signal input to the second detection unit, and inputs the branched signal to the first detection unit, or branches a signal input to the first detection unit. The communication apparatus according to claim 1, further comprising a switch for switching whether to input the branched signal to the second detection unit. The first communication unit includes a first antenna that radiates a radio signal, a first output unit that outputs a transmission signal toward the first antenna, and the first output unit from the first output unit. A first signal extraction unit that extracts a part of the transmission signal output toward the antenna and inputs the extracted signal to the first detection unit;
The second communication unit includes a second antenna that radiates a radio signal, a second output unit that outputs a transmission signal toward the second antenna, and the second output unit from the second output unit. A second signal extraction unit that extracts a part of the transmission signal output toward the antenna and inputs the extracted signal to the second detection unit;
5. The transmission path according to claim 1, wherein a part of the transmission signal extracted by the second signal extraction unit is branched, and the branched signal is input to the first detection unit. The communication device according to any one of the above. A first communication unit having a first control unit that feedback controls transmission power based on a detection result of a first detection unit that detects a power level of the input signal, and detects a power level of the input signal A circuit component used in a communication device including a second communication unit having a second control unit that controls transmission power based on a detection result of the second detection unit,
A circuit component comprising: a transmission path for branching a signal input to the second detection unit and inputting the branched signal to the first detection unit. A transmission power control method executed by a communication device including a first communication unit and a second communication unit,
Controlling the transmission power of the second communication unit based on the detection result of the power level of the transmission signal output from the second communication unit;
Transmitting a part of a transmission signal output from the second communication unit to the first communication unit;
Controlling the transmission power of the first communication unit based on the detection result of the power level of the transmission signal output from the first communication unit and the transmission signal transmitted from the second communication unit. A transmission power control method characterized by the above.

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