JPH06350477A - Transmission power control system - Google Patents

Abstract

PURPOSE:To control a transmission power to the absolute minimum in a range where no trouble occurs in communication according to the information of sensitivity of a signal by using a tone signal of low frequency and sending the sensing status of the signal to a communication opponent mutually. CONSTITUTION:A transmission tone control signal 20 to be sent to an opposite station is generated by a controller 10 based on a reception signal strength signal 18 obtained while reception is performed, and it is generated in the tone signal 16 that is the signal of low frequency via a tone generation circuit 11, and it is transmitted by inputting to a transmission modulation circuit 3 with an audio signal inputted from a microphone. Also, the transmission output sent from the opposite station and in accordance with the reception signal intensity signal 18 of its own station sampled from an amplifier 6 and obtained from a reception signal intensity detection circuit 8 is judged by the controller 10, and a transmission power control circuit 4 controls a transmission power amplifier circuit 2 corresponding to the signal, and inputs a modulated transmission signal to the transmission power amplifier circuit 2, and sends out a transmission power 14 whose power is adjusted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a wireless communication device,
The present invention relates to a transmission power control method for reducing power consumption during transmission.

[0002]

2. Description of the Related Art Conventionally, the most effective method for saving power consumption during transmission in a wireless communication device is to reduce the output power during transmission, but the required transmission output power differs depending on the situation. Happens.

Further, in order to grasp the communication situation, it is necessary to know whether or not the signal of the own station clearly reaches the other station. For that purpose, the signal strength displayed during reception is verbally transmitted. The method was adopted.

In order to determine the transmission output power at the time of transmission based on this information, the user needs to perform an operation for setting the radio device. In this case, the transmission power corresponding to the change in the situation is finely adjusted. Since the control of 1 depends on the operation of the wireless device user, there is a drawback in that the operation required by the wireless device user becomes complicated if an attempt is made to save the current.

Also in the portable wireless device, the transmission power can be reduced to a necessary minimum as a method for reducing the power consumption at the time of transmission. The settings were left to the user's judgment in four stages. In this case, the user has to confirm the signal input situation from the communication partner, and perform the operation of setting the transmission output according to the situation. This saves power,
There is a drawback that the operation depends on the user's operation, and that the operation becomes complicated when the situation is to be changed in detail.

[0006]

In view of the above problems, the present invention sends the entry level of the partner station to the partner station by using a low frequency tone signal, and the partner station sends the entry level from the partner station. By controlling the transmission power according to the content of the incoming tone signal, the transmission power control method that keeps the transmission power at a necessary minimum at all times in response to changes in the communication situation and suppresses the current consumption during transmission The challenge is to provide.

[0007]

The transmission system section of the wireless communication device has a control circuit for controlling output power at the time of transmission and a low frequency tone generation circuit, and the reception system section is provided with a received signal strength detection circuit and a low frequency tone signal identification circuit. , Converting the received signal strength of each other's communication partner into the frequency change of the low frequency tone signal and adding it to the voice modulation wave at the time of transmission, the partner station decodes this low frequency tone signal and grasps the signal arrival situation, By suppressing the transmission power to the necessary minimum according to this situation, the current consumption during transmission is saved.

[0008]

In order to solve the above-mentioned problems, the present invention is necessary for realizing the present invention based on the basic configuration of a communication device as shown in FIG. 1 as a constituent element. It consists of a transmission power control circuit, a received signal strength detection circuit, a tone frequency discrimination circuit, a tone frequency generation circuit, and a controller that controls each circuit. Using low-frequency tone signals, the communication partner can sense the signal. Are transmitted to each other, and the transmission power is controlled to a necessary minimum within a range where communication is not hindered according to the information.

[0009]

[Example] To increase the possibility of successful communication, the transmission power is maximized until the signal strength information is obtained from the partner station.
After the signal strength information can be detected, the transmission power corresponding to the information is set.

To explain the operation during reception, the antenna input 12 (high frequency signal) during reception is sent to the reception channel selection circuit 5 by the antenna switching circuit 1. Here, only the signal of the desired partner station is selected, and the signal is amplified by the amplifier 6
, And demodulated by the received signal detector circuit 7 and taken out as an audio signal via an amplifier and a speaker. At this time, it is taken out from the received signal strength detection circuit 8 as a voltage change according to the strength of the signal of the partner station, input to the controller 10, and used as a reference value of the signal strength information to be sent to the partner station at the next transmission. The arrival status of these signals is sent to the voice signal from the other station as a frequency change of the low frequency tone signal, and this signal is input to the tone discrimination circuit 8 to receive the frequency change as a 5-bit digital signal. It is input to the controller 10 as the signal strength information of its own station in order to be converted into the tone discrimination signal 19.

In the case of transmission, the controller 10 creates a transmission tone control signal 20 to be sent to the other station based on the reception signal strength signal 18 obtained during reception, and the tone generation circuit 11 transmits it. The tone signal 16 which is a low frequency signal is generated, and is input to the transmission modulation circuit 3 and transmitted together with the voice signal input from the microphone.

Also, the controller 10 judges the transmission output corresponding to the received signal strength signal 18 of the own station, which is sent from the other station and extracted from the amplifier 6 and obtained from the received signal strength detection circuit 8. In response to this signal, the transmission power control circuit 4 controls the transmission power amplification circuit 2, inputs the modulated transmission signal into the transmission power amplification circuit 2, and sends out the transmission output 14 whose power is adjusted.

As shown in Table 1, these standardized and unified frequencies are made to correspond to some kinds of tone frequencies, signal strengths, and output powers according to the resolution of the transmission power control circuit. To do.

[0014]

[Table 1]

Further, as shown in Table 2, when the transmission output is set to four stages and the transmitted wave from the partner station has no tone,
Maximize the transmission power of the radio of your station and set the tone frequency to, for example, 67.0 Hz, 77 Hz, 91.5 Hz,
When it is set to 110.9 Hz, the reception strength of the transmitted wave reaching the partner station at the partner station radio is maximum, large, medium,
The output that can be transmitted by the own station is set to the minimum, small, medium, and high, respectively, in a form corresponding to the small.

[0016]

[Table 2]

Furthermore, since the standardized low frequency tone signal can be used as the low frequency tone signal used here, the conventional transmission / reception circuit can be used as it is and can be realized by adding the control function of the controller. . Further, since a low frequency band different from the voice band is used as the signal strength information, control can be performed without disturbing normal communication.

Next, the operation of the controller of the present invention will be described with reference to the flowchart of FIG. In step 20, it is judged whether the signal is within 3 seconds,
If there is no signal within 3 seconds, that is, no signal is 3se
If it continues for more than c, in step 21, no tone is set, as there is no strength information for the partner station (communication failure). If the received signal strength detection signal is within 3 seconds in step 20, the received signal strength is detected through the amplifier 6 and the received signal strength detection circuit 8 in step 22, and the next signal is detected in step 23. Converts to a tone frequency to notify the receiving station of the receiving status during transmission.

Then, in step 24, it is judged whether or not there is a tone. If there is no tone, the transmission power is maximized by the transmission power control circuit 4 in step 27. If a tone can be detected, it is transmitted in step 25. Decoding the tone frequency that came back, step 26
In step 2, a signal for determining the transmission power is sent to the transmission power control circuit 4, the transmission power is determined, and then transmission is performed in step 28.

In addition, the controller can also switch the circuit of the communication device by operating the transmission / reception changeover switch and control the transmission / reception frequency.
It is possible to analyze the transmission signal of the partner station and perform control according to the situation. Further, the tone frequency discrimination circuit 9 used in the present invention
Is a CTCSS (Conti) used for selecting a receiving station.
nous Tone Controlled Sub-
An and squelch encoder / decoder system can be used, and the squelch is opened only when the tone frequency matches the frequency defined in the system, and the tone frequency can be determined.

[0021]

As described above, the present invention does not require the addition of a special circuit and utilizes the low frequency tone signal by using the conventional circuit function. The power consumption during transmission can be saved by transmitting the data to the mobile terminal and communicating with the minimum required transmission power that corresponds to changes in the situation, so it is possible to effectively suppress the current consumption during transmission and use batteries. In the portable wireless communication device,
There is an effect that the usage time can be extended.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a communication device used in a transmission power control system of the present invention.

FIG. 2 is a flowchart showing the operation of the controller of the present invention.

[Explanation of symbols]

 1 antenna switching circuit 2 transmission power amplification circuit 3 transmission modulation circuit 4 transmission power control circuit 5 reception tuning circuit 6 amplifier 7 reception signal detection circuit 8 reception signal strength detection circuit 9 tone frequency discrimination circuit 10 controller 11 tone generation circuit 12 antenna input Output 13 Reception antenna input 14 Transmission output 15 Transmission modulation signal 16 Transmission tone signal 17 Transmission power control signal 18 Reception signal strength signal 19 Reception tone discrimination signal 20 Transmission tone control signal

Claims (1)

[Claims] 1. In a transmission / reception system in which a signal strength displayed during reception is communicated by communication with a partner station to reduce power consumption during transmission, a signal extracted from an amplifier of a receiver of a wireless communication device is used. By using the signal strength detector to convert the received signal strength signal, and then inputting that signal to the controller, the partner station can determine what kind of signal strength the transmission wave transmitted by the partner station has. A means for sending a transmission tone control signal from the controller to a tone generation circuit for producing a tone signal, and a reception tone signal discrimination circuit from a wave detector of the receiving section of the radio communication device are used to input the reception tone discrimination signal to the controller. By outputting the transmission power control signal for controlling the transmission power of the own station from the controller to the transmission power control circuit, Means for controlling the power consumption of the transmission wave of, the local station side sends the transmission tone signal together with the transmission wave to the other station to control the transmission power consumption of the other station, and from the other station A transmission power control method characterized in that the transmission tone signal transmitted together with the transmission wave controls the reduction of power consumption when the local station transmits.