JP2001168797A - Transmission power control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control transmission power to the lowest without deteriorating communication quality. SOLUTION: A power control part 13-1 controls a power amplifier 12-1 based on an up transmission signal power control instruction signal Sc1 and maintains transmission power to within an upper limit and a lower limit, which are previously decided. A storage 15-1 stores an upper threshold deciding the upper limit of transmission power and a lower threshold deciding the lower limit. A judgment part 7-1 monitors the reception state of a reception signal and judges the propriety of the transmission signal power of transmission station B. A control/processing part 8-1 generates a down transmission power control instruction signal Sd1 based on the judged result of the judgment part 7-1, multiplexes it with a transmission signal and sends it to the transmission station B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission power control system for controlling transmission power during radio communication.

[0002]

2. Description of the Related Art During radio communication between a transmitting station and a receiving station, a receiving station detects communication quality such as a reception level and an error rate of a received signal received from the transmitting station, and performs radio communication based on the communication quality. The transmission power of the own transmission signal is controlled by judging the surrounding environment.

[0003]

However, the prior art has the following problems to be solved. It is indispensable for the transmission power control to accurately detect its own transmission power amount. However, in the conventional transmission power control system,
The detection characteristics of the detector for measuring the transmission power amount had large variations among the devices. Also, the output of the detector fluctuated greatly depending on the surrounding environment. For the above reasons, it has been difficult to accurately detect the own transmission power amount.
On the other hand, since the transmission power amount is controlled only by the communication quality of the received signal, sometimes the battery is emptied by trying to control it, for example, when it is in a state where it cannot be controlled under a special surrounding environment. Case also occurred.

[0004]

The present invention employs the following structure to solve the above problems. <Configuration 1> During wireless communication between the transmitting station and the receiving station, the increase / decrease of the transmission power amount of the own transmission signal is controlled based on the uplink transmission power control instruction signal multiplexed on the reception signal received from the transmission station. Then, from the reception state of the reception signal, determine whether the transmission power amount of the transmission station is appropriate or not, generate a downlink transmission power control instruction signal, multiplex the transmission signal of the self, and transmit it to the transmission station. The receiving station controls the power amplifying unit based on the uplink transmission power control instruction signal to increase or decrease the transmission power amount of the own transmission signal, and controls the power amplification unit to set the transmission power amount to a predetermined upper limit. A power control unit that maintains between the value and the lower limit, a storage unit that stores an upper threshold that determines the upper limit of the transmission power amount and a lower threshold that determines the lower limit, and monitors the reception state of the received signal. The transmitting power of the transmitting station A transmission unit comprising: a determination unit that determines whether the amount is appropriate; and a control / processing unit that generates the downlink transmission power control instruction signal based on the determination result of the determination unit, multiplexes the downlink transmission power control instruction signal with the transmission signal, and transmits the multiplexed transmission signal to the transmission station. Power control system.

<Structure 2> In the transmission power control system according to structure 1, the power control unit receives a part of the own transmission signal and performs detection, and the uplink transmission power control instruction signal includes If the transmission power amount is instructed, the output level of the detection unit is compared with the upper limit threshold read from the storage unit, and the output level of the detection unit is lower than the upper limit threshold. An amplification factor control signal for increasing the amplification factor of the amplification unit is sent to the power amplification unit, and when the uplink transmission power control instruction signal indicates a decrease in the transmission power amount, the output level of the detection means and When the output level of the detection means is higher than the lower threshold value by comparing the lower threshold value read from the storage section, the gain control signal for decreasing the amplification factor of the power amplifier section is increased by the power increase. Transmission power control system, characterized in that it comprises a comparison control means for sending the parts.

<Configuration 3> In the transmission power control system according to Configuration 1 or 2, the storage section stores a correction value of the output level of the detection means, and the power control section stores the correction value of the detection means. A transmission power control system comprising a correction unit that corrects an output level based on the correction value and outputs the corrected output level.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below using specific examples. <Structure> In the present invention, in order to solve the above problem, the output of the detector is corrected by a predetermined correction value. Further, an upper limit value and a lower limit value are set for controlling the transmission power amount. To fulfill the above functions, the present invention is configured as follows.

FIG. 1 is a block diagram of the configuration of the present invention. As shown in FIG. 1, the transmission power control system according to the present invention is composed of a (receiving station) A and a (transmitting station) B, which are connected by an (electromagnetic wave) C. Here, since (receiving station) A and (transmitting station) B are devices having a reversible function, only the configuration of (receiving station) A will be described below.

(Receiving station) A includes an antenna 1-1, a switch 2-1, a receiving amplifier 3-1 and a receiving mixer 4-1.
, A receiving intermediate frequency amplifying section 5-1, a demodulating section 6-1, a determining section 7-1, a control / processing section 8-1, a control instruction signal multiplexing section 9-1, and a transmitting intermediate frequency amplifying section. 10-1, a transmission mixer 11-1, a power amplifier 12-1, and a power controller 1
3-1; local oscillator section 14-1; and storage section (ROM)
15-1.

The antenna 1-1 receives a high-frequency transmission signal RFt.
1 (St1 + Sd1) is converted into an electromagnetic wave and emitted, and the electromagnetic wave is received and the high-frequency reception signal RFr1 (St2 + Sd1) is received.
This is a part that receives 2) and converts it into an electric signal. The switch 2-1 is connected to the antenna 1-1 and connected to the high-frequency transmission signal R
Ft1 (St1 + Sd1) and high frequency reception signal RFr1
This is a part for switching between transmission and reception of (St2 + Sd2).
The reception amplification section 3-1 is a section that receives the high-frequency reception signal RFr1 (St2 + Sd2) from the switch 2-1 and amplifies the high-frequency reception signal RFr1 (St2 + Sd2).

The reception mixing section 4-1 is a section for mixing the output of the local oscillator section 14-1 described later with the output of the reception amplification section 3-1. The receiving intermediate frequency amplifying unit 5-1 is a unit that receives and amplifies the output of the receiving mixing unit 4-1 and detects and amplifies the output. The demodulation section 6-1 is a section that demodulates the output of the reception intermediate frequency amplification section 5-1 and detects an error rate.

The determination unit 7-1 includes a reception intermediate frequency amplification unit 5-
1 and a part of the output of the demodulation unit 6-1 that receives a part of the output and monitors the reception state of the received signal to determine whether the transmission power of the transmitting station is appropriate. The control / processing unit 8-1 generates the downlink transmission power control instruction signal Sd1 based on the determination result of the determination unit 7-1, and multiplexes the downlink transmission power control instruction signal Sd1 on the transmission data St1 via the control instruction signal multiplexing unit 9-1. This is a part to be transmitted to the transmitting station. Further, it receives the uplink transmission power control instruction signal Sd2 transmitted from the transmitting station and generates the uplink transmission power control signal Sc1, which is included in the output of the demodulation unit 6-1.
It is also the part to send to.

The control instruction signal multiplexing section 9-1 is a section that multiplexes the downlink transmission power control instruction signal Sd1 on the transmission data St1. The transmission intermediate frequency amplifying unit 10-1 is a unit that receives the output of the control instruction signal multiplexing unit 9-1, modulates the signal by a predetermined modulation method, and further amplifies it. Transmission mixing unit 11
Reference numeral -1 denotes a portion that obtains a high-frequency transmission signal in a radio frequency band by mixing the output of the transmission intermediate frequency amplification unit 10-1 and the output of a local oscillator unit 14-1 described later.

The power amplifying unit 12-1 includes a transmission mixing unit 11-
This is the portion that amplifies the output of No. 1 while maintaining the radio frequency band.
That is, it is a portion that increases or decreases the transmission power amount of the high-frequency transmission signal. The power control unit 13-1 controls the power amplifying unit 12-1 based on the uplink transmission power control signal Sc1 to maintain the transmission power amount between a predetermined upper limit and a lower limit. is there. The details will be described below with reference to the drawings.

FIG. 2 is a block diagram of the power control unit of the present invention. (A) shows the configuration of the power control unit.
(B) shows the function of the power control unit. FIG. 2 (a)
Thus, the power control unit 13-1 is configured to detect
It includes a / D converter 22-1, a correction unit 23-1, and a comparison control unit 24-1. Further, a temperature detecting means 25-1 is provided as necessary for the apparatus to which the present invention is applied. Detection means 2
1-1 is a part which receives and detects a part of its own transmission signal and converts it into a voltage level.

The A / D converter 22-1 includes a detection unit 21-
1 is a part for receiving the output of the first and performing analog / digital conversion. The correction unit 23-1 includes an A / D converter 22-1.
This is a part for receiving the output of the detection means 21-1 digitally converted in the above, and reading and correcting a correction value stored in a storage unit (ROM) 15-1 described later for each device and each surrounding environment. .

The comparison control means 24-1 receives the uplink transmission power control signal Sc1. Uplink transmission power control signal Sc
1 indicates that the transmission power amount is to be increased, the output level of the correction unit 23-1 is compared with the upper limit threshold value read from the storage unit 15-1, and the output level of the correction unit 23-1 is set to the upper limit. While the value is lower than the threshold value, the amplification factor of the power amplification unit 12-1 is increased. When the uplink transmission power control signal Sc1 indicates a decrease in the transmission power amount, the output level of the correction unit 23-1 is compared with the lower threshold read from the storage unit 15-1, and the correction unit 23-1 While the output level is higher than the lower threshold, it is a part that reduces the amplification factor of the power amplification unit 12-1. The increase or decrease of the transmission power is performed by transmitting the amplification factor control signal Sa to the power amplification unit 12-1.
The temperature detecting means 25-1 is a thermometer that detects the temperature inside the device.

Returning to FIG. 1, the configuration of the transmission power control system will be described. The local oscillator section 14-1 is a section that oscillates a highly stable local oscillation signal. Storage unit (RO
M) 15-1 is a section for storing various data such as the correction value, the upper threshold value, and the lower threshold value.

<Operation> The operation of the embodiment 1 will be described with reference to FIG. The (electromagnetic wave) C emitted by the (transmitting station) B is received by the antenna 1-1 of the (receiving station) A. Antenna 1-1
Converts this (electromagnetic wave) C into a high-frequency reception signal RFr1 (St2 + Sd2), which is an electric signal, and sends it to the switch 2-1. The switch 2-1 outputs the high-frequency reception signal RFr1
(St2 + Sd2) is sent to the reception amplifier 3-1.

The reception amplifier 3-1 amplifies the high frequency reception signal RFr1 (St2 + Sd2) received from the switch 2-1 and sends the output to the reception mixer 4-1. The reception mixer 4-1 receives the output of the local oscillator 14-1 and mixes it with the output of the reception amplifier 3-1.
The mixed output is sent to the reception intermediate frequency amplifier 5-1.
The reception intermediate frequency amplification section 5-1 receives and amplifies the output of the reception mixing section 4-1, detects the output, and sends it to the demodulation section 6-1. A part of the transmitted signal is branched to the determination unit 7-1.

The demodulation unit 6-1 includes a reception intermediate frequency amplification unit 5-
1 and demodulate according to a predetermined demodulation method. At this time, the output of the receiving intermediate frequency amplifier 5-1 is demodulated and the error rate is detected. This error rate is reported to the determination unit 7-2. The determination unit 7-1 includes a reception intermediate frequency amplification unit 5-1.
, The signal level is detected from a part of the output signal received from the demodulation unit 6-1, and at the same time, the reception state of the received signal is detected in comparison with the error rate received from the demodulation unit 6-1. Based on this reception state, the transmission power of (transmission station) B is determined to be appropriate and reported to the control / processing unit 8-1. The magnitude of the signal level detected here and the error rate depend on the transmission power of (transmitting station) B and the propagation environment of (electromagnetic wave) C.

The output of the demodulation unit 6-1 is (transmitting station) B
, And an uplink transmission power control instruction signal Sd2 from the (transmitting station) B. The transmission data St2 from the (transmission station) B is transmitted to other components (not shown) as reception data Sr1 of the (reception station) A. The uplink transmission power control instruction signal Sd2 is (reception station)
Although the signal is extremely important for the control of A, the explanation is temporarily suspended here, and first, the control /
The description of the report to the processing unit 8-1 will be continued.

The control / processing unit 8-1, having received the report from the judgment unit 7-1, divides the report into good quality and excessive quality. The division criterion is a criterion predetermined according to the type of system, the type of transmission data, and the like.
1 possesses. This reference may be provided in a ROM separately from the control / processing unit 8-1 and stored therein, or may be provided in a circuit configuration inside the control / processing unit 8-1.

Upon receiving the report, the control / processing section 8-1 divides the report into good quality and excess quality. From this result, a downlink transmission power control instruction signal Sd1 is generated and sent to the control instruction signal multiplexing section 9-1. An example of the downlink transmission power control instruction signal Sd1 will be described. The downlink transmission power control instruction signal Sd1 is a control signal 2 (not shown).
Bits are occupied, with good quality being assigned bit (1,0) and excess quality being assigned bit (0,1).

The downlink transmission power control instruction signal Sd1 is multiplexed on the transmission data St1 by the control instruction signal multiplexing section 9-1 and sent to the transmission intermediate frequency amplification section 10-1. The downlink transmission power control instruction signal Sd1 is sent to the (transmission station) B following the process described below, where it is converted into the downlink transmission power control signal Sc2 of the (transmission station) B, and then transmitted to the (transmission station). ) B
Is used to control the amount of transmission power.

The transmission intermediate frequency amplifying section 10-1 receives the output of the control instruction signal multiplexing section 9-1, modulates it according to a predetermined modulation method, further amplifies it, and sends it to the transmission mixing section 11-1. The transmission mixing unit 11-1 includes a transmission intermediate frequency amplification unit 10
-1 and the output of a local oscillator unit 14-1 described later are mixed and converted into a radio frequency band, and the power is amplified by a power amplification unit 12-1.
Send to The power amplifying unit 12-1 includes a transmission mixing unit 11-
1 is amplified in the radio frequency band, and the output of the switch 2-1 is changed.
Send to At the same time, a part of the output is branched and transmitted to the power control unit 13-1.

The power control unit 13-1 receives a part of the branched output and the uplink transmission power control signal Sc1 from the control / processing unit 8-1, and controls the power amplification unit 12-1 to transmit. The electric energy is maintained between a predetermined upper limit and a lower limit. Here, since the description of the uplink transmission power control signal Sc1 is needed, the description returns to the description of the uplink transmission power control instruction signal Sd2 whose description has been suspended at the output of the uplink demodulation unit 6-1.

The uplink transmission power control instruction signal Sd2 from the (transmission station) B included in the output of the demodulation section 6-1 is controlled by
It is sent to the processing unit 8-1. Like the downlink transmission power control instruction signal Sd1 of the (receiving station) A, the uplink transmission power control instruction signal Sd2 has bits (1, 0) for good quality.
However, bits (0, 1) are allocated to the excess quality. The control / processing unit 8-1 outputs a good quality bit (1, 0).
Is received, the uplink transmission power control signal Sc1 (1,
0), when accepting the excess quality bits (0,1),
The uplink transmission power control signal Sc1 (0, 1) is transmitted to the power control unit 13-1.

Hereinafter, the operation of the power control unit 13-1 will be described in detail with reference to FIG. Power control unit 13-1
Receives the high-frequency transmission signal RF1, which is a part of the output signal, from the power amplification unit 12-1. Detecting means 21-
1 receives and detects this high-frequency transmission signal RF1 and converts it to a voltage level. The A / D converter 22-1 is:
The output of the detection means 21-1 is received and subjected to analog / digital conversion. The correction unit 23-1 is provided with the A / D converter 22.
Receiving the output of the detection means 21-1 which has been digital-converted by -1 and reading out the correction value which is determined for each device and for each surrounding environment and stored in a storage unit (ROM) 15-1 which will be described later and corrected. I do.

In FIG. 2B, a straight line (C) shows an ideal state where the correlation between the voltage level of the high-frequency transmission signal RF1 and the output level of the detection means is ideal. However, due to variations in the use environment of each device, etc.
Has changed to a straight line (A) or a straight line (B). The amount of change is measured in advance for each device and for each change in the use environment, and its correction value (A) and correction value (B) are obtained and stored in the storage unit 15-1. Here, the correlation is represented by a straight line for convenience of explanation, but it is rarely a straight line in reality. However, no inconvenience occurs even with a curve as long as the correction value is obtained by actually measuring.

The comparison control means 24-1 includes a correction means 23-
Accept the detection output corrected from 1. At the same time, the uplink transmission power control signal Sc1 (0,1) is sent from the control / processing unit 8-1.
Or, it receives the uplink transmission power control signal Sc1 (1,0). When the uplink transmission power control signal Sc1 (1, 0) is being sent, an increase in the transmission power is instructed.
In this case, the output level of the correction unit 23-1 and the storage unit 15
The upper limit threshold value read from -1 and comparing means 23
While the output level of -1 is lower than the upper threshold, the amplification factor of the power amplifying unit 12-1 is increased. When the uplink transmission power control signal Sc1 (0, 1) is being sent, it is instructed to decrease the transmission power amount. In this case, the correction means 23
The output level of -1 is compared with the lower threshold read from the storage unit 15-1, and the amplification factor of the power amplifier 12-1 is reduced while the output level of the correction unit 23-1 is higher than the lower threshold. The increase / decrease of the amplification factor is controlled by an amplification factor control signal Sa1 sent from the power control unit 13-1 to the power amplification unit 12-1.

Referring back to FIG. The high-frequency transmission signal RFt1 (St1 + Sd1) controlled to the optimal transmission power amount by the amplification factor control signal Sa1 described above is switched to the switch 2-1.
Sent to This high-frequency transmission signal RFt1 (St1 +
Sd1) is converted into an electromagnetic wave by the antenna 1-1 and transmitted to the (transmitting station) B. (Transmitting station) B receives the electromagnetic wave with the antenna 1-2 and receives the high-frequency reception signal RFr2 (St).
1 + Sd1).

In the same manner as in the operation of the above (transmitting station) B, the switch 2-2 outputs the high frequency reception signal RFr2 (St1 + Sd
1) is sent to the reception amplification section 3-2. Reception amplifier 3-2
Is a high frequency reception signal RFr2 (St1) from the switch 2-2.
+ Sd1) and amplifies it at a high frequency, and sends its output to the reception mixer 4-2. The reception mixer 4-2 receives the output of the local oscillator 14-2 and receives the output of the local oscillator 14-2.
-2, and outputs the mixed output to the reception intermediate frequency amplifier 5-2. The reception intermediate frequency amplification unit 5-2 includes:
The output of the reception mixer 4-2 is received and amplified, detected, and sent to the demodulator 6-2. A part of the transmitted signal is branched to the determination unit 7-2.

The demodulation section 6-2 includes a reception intermediate frequency amplification section 5-
2 is received and demodulated according to a predetermined demodulation method. At this time, the output of the receiving intermediate frequency amplifier 5-2 is demodulated and the error rate is detected. This error rate is reported to the determination unit 7-2. The determination unit 7-2 includes a reception intermediate frequency amplification unit 5-2.
, The signal level is detected from a part of the output signal received from the demodulator 6-2, and at the same time, the reception state of the received signal is detected by comparing with the error rate received from the demodulator 6-2. From this reception state, the propriety of the transmission power of (receiving station) A is determined and reported to the control / processing section 8-2. The magnitude of the signal level detected here and the error rate depend on the transmission power amount of (receiving station) A and the propagation environment of (electromagnetic wave) C.

The output of the demodulating unit 6-2 is (receiving station) A
And the downlink transmission power control instruction signal Sd1 from the (receiving station) A. The transmission data St1 from the (receiving station) A is sent to another component (not shown) as received data Sr2 of the (transmitting station) B. Downlink transmission power control instruction signal Sd1 is sent to control / processing section 8-2. Here, the description of the downlink transmission power control instruction signal Sd1 is temporarily suspended, and the determination unit 7-
2 to the control / processing unit 8-2.

The control / processing unit 8-2, which has received the report from the determination unit 7-2, divides the report into good quality and excessive quality. The division criterion is a criterion predetermined according to the type of system, the type of transmission data, and the like.
2 possesses. This reference may be stored in a ROM provided separately from the control / processing unit 8-2, or may be provided in a circuit configuration inside the control / processing unit 8-2.

When receiving the above report, the control / processing section 8-2 divides the report into good quality and excessive quality. From this result, an uplink transmission power control instruction signal Sd2 is generated and transmitted to the control instruction signal multiplexing section 9-2. An example of the uplink transmission power control instruction signal Sd2 will be described. The uplink transmission power control instruction signal Sd2 is a control signal 2 (not shown).
Bits are occupied, with good quality being assigned bit (1,0) and excess quality being assigned bit (0,1).

The uplink transmission power control instruction signal Sd2 is multiplexed on the transmission data St2 by the control instruction signal multiplexing section 9-2 and sent to the transmission intermediate frequency amplification section 10-2. The uplink transmission power control instruction signal Sd2 is sent to (receiving station) A following the process described below, where it is converted into an uplink transmission power control signal Sc1 of (receiving station) A, and ) A
Is used to control the amount of transmission power.

The transmission intermediate frequency amplifying section 10-2 receives the output of the control instruction signal multiplexing section 9-2, modulates it according to a predetermined modulation method, further amplifies it, and sends it to the transmission mixing section 11-2. The transmission mixing section 11-2 includes a transmission intermediate frequency amplification section 10
-2 and the output of the local oscillator unit 14-2 are mixed, converted into a radio frequency band, and transmitted to the power amplification unit 12-2.
The power amplifying unit 12-2 amplifies the output of the transmission mixing unit 11-2 while keeping it in the radio frequency band and sends it to the switch 2-2.
At the same time, a part of the output is branched and the power control unit 13-2
Send to

The power control section 13-2 receives a part of the branched output and the downlink transmission power control signal Sc2 from the control / processing section 8-2, and controls the power amplification section 12-2 to transmit. The electric energy is maintained between a predetermined upper limit and a lower limit. Next, return to the description of the downlink transmission power control instruction signal Sd1 whose description has been suspended at the output of the demodulation unit 6-2.

The downlink transmission power control instruction signal Sd1 from the (receiving station) A included in the output of the demodulation unit 6-2 is controlled /
It is sent to the processing unit 8-2. Like the downlink transmission power control instruction signal Sd1 of the (receiving station) A, the downlink transmission power control instruction signal Sd1 has bits (1, 0) for good quality.
However, bits (0, 1) are allocated to the excess quality. The control / processing unit 8-2 outputs a good quality bit (1, 0).
Is received, the downlink transmission power control signal Sc2 (1,
0), when accepting the excess quality bits (0,1),
The downlink transmission power control signal Sc2 (0, 1) is transmitted to the power control unit 13-2.

Hereinafter, the power control unit 13-2 is operated in exactly the same manner as the power control unit 13-1 already described (FIG. 2).
Control signal S sent from the power amplifier 12-2 to the power amplifier 12-2
a2. High-frequency transmission signal R controlled to an optimal transmission power amount by this amplification factor control signal Sa2
Ft2 (St2 + Sd2) is sent to switch 2-2. This high-frequency transmission signal RFt2 (St2 + Sd2) is converted into an electromagnetic wave by the antenna 1-2 and sent to the (receiving station) A. Hereinafter, the same operation is repeated (receiving station) A
And (transmitting station) B, transmission power is controlled.

In the operation described above, the determination result of the determination unit is described as an example, and the description is limited to the two levels of the good level (1, 0) and the excess level (0, 1).
It is not limited to this example, and it is easy to add another level. For example, by adding an underlevel (0,0), (transmitting station) B or (receiving station) A sends out this underlevel (0,0) when the reception state is extremely poor. The (transmitting station) B or the (receiving station) A, which has accepted the transmission power control instruction signal of the underlevel (0, 0), can perform processing such as temporarily stopping the transmission power control and waiting for an improvement in the radio wave space. become. In the above description, it has been described that the storage unit 15-1 stores the correction value for each ambient environment. However, the ambient environment may include the ambient temperature as needed. In this case, the temperature detecting means 25-1 (FIG. 2) is required.

[0044]

According to the present invention, it is possible to control the transmission power amount to the minimum amount without lowering the communication quality. Further, in a case where the battery cannot be controlled under a special surrounding environment, the amplification factor of the power amplification unit is excessively increased to force the control, and the battery is not emptied.

[Brief description of the drawings]

FIG. 1 is a block diagram of the configuration of the configuration of the present invention.

FIG. 2 is a block diagram of a power control unit of the present invention.

[Explanation of symbols]

 1-1, 1-2 Antenna 2-1, 2-2 Switch 3-1, 3-2 Reception amplification section 4-1, 4-2 Reception mixing section 5-1, 5-2 Reception intermediate frequency amplification section 6 -1, 6-2 Demodulation unit 7-1, 7-2 Judgment unit 8-1, 8-2 Control / processing unit 9-1, 9-2 Control instruction signal multiplexing unit 10-1, 10-2 Transmission intermediate frequency Amplifiers 11-1 and 11-2 Transmission mixers 12-1 and 12-2 Power amplifiers 13-1 and 13-2 Power controllers 14-1 and 14-2 Local oscillators 15-1 and 15-2 Storage Unit (ROM) St1, St2 Transmission data Sr1, Sr2 Reception data Sc1 Up transmission power control signal Sd1 Down transmission power control instruction signal Sc2 Down transmission power control signal Sd2 Up transmission power control instruction signal A Receiving station B Transmitting station

Claims (3)

[Claims] 1. During radio communication between a transmitting station and a receiving station, an increase / decrease of transmission power amount of its own transmission signal is determined based on an uplink transmission power control instruction signal multiplexed on a reception signal received from the transmission station. Controlling the transmission signal amount of the transmission station from the reception state of the reception signal to determine the appropriateness of the transmission power amount, generate a downlink transmission power control instruction signal, multiplex the transmission signal to the own transmission signal, and transmit the transmission signal to the transmission station. The receiving station has a power amplifying unit that increases and decreases the transmission power amount of the own transmission signal, and controls the power amplifying unit based on the uplink transmission power control instruction signal to set the transmission power amount in advance. A power control unit that maintains between an upper limit value and a lower limit value, a storage unit that stores an upper limit threshold value that determines the upper limit value of the transmission power amount and a lower limit threshold value that determines the lower limit value, and monitors a reception state of the reception signal. Of the transmitting station A determination unit that determines whether the amount of received power is appropriate; and a control / processing unit that generates the downlink transmission power control instruction signal based on a determination result of the determination unit, multiplexes the downlink transmission power control instruction signal with the transmission signal, and sends the multiplexed transmission signal to the transmission station. Transmission power control system. 2. The transmission power control system according to claim 1, wherein the power control unit receives a part of the own transmission signal and performs detection, and transmits the uplink transmission power control instruction signal. When the increase of the power amount is instructed, the output level of the detection unit is compared with the upper threshold read from the storage unit, and the power amplification is performed while the output level of the detection unit is lower than the upper threshold. Sending an amplification factor control signal for increasing the amplification factor of the unit to the power amplification unit, and when the uplink transmission power control instruction signal instructs a decrease in the amount of transmission power, the output level of the detection means and the When the output level of the detection means is higher than the lower threshold value by comparing the lower threshold value read from the storage unit, an amplification control signal for decreasing the amplification factor of the power amplification unit is transmitted to the power amplification unit. A transmission power control system comprising a comparison control unit for transmitting. 3. The transmission power control system according to claim 1, wherein the storage unit stores a correction value of an output level of the detection unit, and the power control unit stores a correction value of the detection unit. A transmission power control system comprising: a correction unit that corrects an output level based on the correction value and outputs the corrected output level.