JPH0888579A - Transmission power saving system - Google Patents

Abstract

PURPOSE: To control the transmission power so as to optimize the reception level by changing the save transmission power of a transmission power selecting means by the control of a coincidence detection means to automatically set a reference reception level at the time of selecting the save mode. CONSTITUTION: The reception level in a reception part is classifies to 5 stages L1 to L5. A station A-1 communicates with a station F-4 or the other party and is 10km distant from this station and has the reception level of about L1 and performs communication with 5W rated transmission power. A station A-2 communicates with a station E-3 and is about 7km distant from this station and has the reception level of about L2 and performs communication with about 2.7W as a first save transmission power. In the same manner, distances between stations A-3 and D-2 and between stations A-4 and C-1 are 5km and 3km respectively, and their reception levels are about L3 and L4 respectively, and they perform communication with 1.8W and 1W as second and third save transmission powers respectively. The distance between stations A-5 and B-0 of short-distance communication is <=1km, and the reception level is a maximum of L5, and especially, they sufficiently communicate with each other with a transmission power equal to or lower than 100mW economy transmission power.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication system in which a wireless communication device is used to set a transmission power optimum for communication between a partner station and its own station for communication.

[0002]

2. Description of the Related Art In a wireless communication device, normal transmission power is communicated at a rated transmission power permitted by the device. Therefore, if there is a large receiving input on the receiving side, adjust the high frequency gain, intermediate frequency gain, etc.,
The AGC circuit was set in an appropriate reception state for communication.

In addition to adjusting the reception level only on the receiving side, when the own station is in a receiving state, the level indicator of the receiving circuit is full scale by the transmission signal from the other station, but the microphone signal is input. Some have a function of automatically switching the transmission output of the own station to the LOW level in the absence of a signal. However, even in this case, when the other station changes to a reception signal modulated by a voice signal, the transmission power of the own station automatically changes to the normal rated transmission power and transmission / reception is performed.

[0004]

In the transmission save function of the conventional radio communication device as described above, when the signal of the partner station is detected at full scale, the transmission power is automatically adjusted when there is no microphone voice input and no modulation. Then, when the voice signal is detected in the received signal, the rated transmission power is restored and the signal is transmitted. Further, in the present invention, a transmission power saving method in which the transmission power is switched according to the level of the received signal for transmission is not a method in which transmission power is saved and communication is performed as in the case of adjusting only the reception side using AGC or the like. For the purpose of providing.

[0005]

[Means for Solving the Problems] Transmission power selecting means for selecting and transmitting one of a rated transmission power and a plurality of stages of save transmission power (hereinafter referred to as transmission power) to a wireless communication device, and full reception level. The level is equally divided into a plurality of stages and one of the areas is selected and set as a reference reception level, and the reception level is calculated every N times for N times and an average value is calculated to obtain the average reception level. And the reference reception level are compared to detect a match, and if the match detection means does not match, the transmission power selection means is controlled to sequentially change the transmission power to the save transmission power so that the average reception level is When the save mode is selected, the save transmission power of the transmission power selection means is changed and the reference reception is automatically performed. It is configured to become bell. To detect the reception level of the coincidence detecting means, the reception level for N times of reception is stored in the memory, and the reception level data of the memory is calculated and generated every N times and the memory is sequentially overcoated. Memory storage means.

[0006]

In the communication system using the present invention, the transmission power of the wireless communication device is the rated transmission power, the first save transmission power, and the second transmission power.
Assuming that the save transmission power and the third save transmission power are four levels, first, when the save mode is selected, the next reference reception level is set. When starting communication with the partner station of communication, they are transmitted to each other at the rated transmission power. N
When receiving the number of times, the average value of the receiving level of N times is calculated, and the average receiving level is compared with the reference receiving level. If they match, the communication is continued with the transmission power, and if they do not match, the first save transmission power is set. Change and communicate, and if N times are received, calculate and update the average value, if they match, continue communication at that transmission level, if they do not match, further reduce the save transmission power and repeat this comparison control until they match. The communication is continued in the state of matching. Even if the communication station moves from this matched state and the reception level fluctuates, the save transmission power is changed in accordance with the fluctuation and smooth communication becomes possible.

[0007]

[Embodiment] In the wireless communication device, there is a large difference in the rated transmission power depending on the application. For example, a handy transceiver or the like has a rated transmission power of 5W. Mobile S for automobiles is 10W, Mobile M is 25W, Mobile H
Then, there is a transmission power of 50 W or the like. For the fixed station, the transmission power is 10 W for the fixed station S and 50 for the fixed station M.
W and fixed station H are up to 100W.

Here, the handy transceiver will be described in detail. If it is close to the communication partner station, sending at rated transmission power may cause full-scale saturation, and to prevent this from occurring with transmission power, save transmission power in multiple stages is set and switched. It is configured so that it can be output. This switching is configured by a push button so that it can be controlled by the CPU without providing a changeover switch, especially in a small handy type. In the present invention, this switching has a function that can be automatically set. In the case of the present invention, in order to simplify the description, the save transmission power will be described as four kinds.

In a 5 W handy transceiver, for example, the rated power is 5 W, the first save transmission power is 2.7 W, the second save transmission power is 1.8 W, and the third save transmission power is 1 W. Extremely short 1
Economical transmission power of 10 when the distance is within km
It is also possible to consider a device of 0 mW or less.

The setting of the save transmission power can be freely changed and set to a desired save transmission power, but the description thereof is omitted because it is not directly related to the present invention.

The receiving unit displays the received signal as a level meter or a decibel value. In either case of the display, the reception level is divided into five equal to the full scale of the display and L1,
The signal is classified into five stages of L2, L3, L4, and L5, and the reception level falls into any of the five stages.
One of these classifications is selected and set as a desired reception level and used as a reference reception level. When the save mode is selected, the rated transmission power at the start of communication converges so that the average reception level gradually approaches the reference reception level set for each reception by communicating with each other, and the save transmission power finally matches. Be changed. When they match, the save transmission power is used for subsequent communication. In this case, not only the own station but also the other station takes the same steps to change to the save transmission power and the communication is continued.

FIG. 1 is a diagram showing a communication state during a save mode between the handy transceiver stations, and this communication state will be briefly described. If the station A-1 in the figure communicates with the other party's station F-4 and is 10 km away, the reception level is about L1 classified, so that the transmission power is 5 W and the rated transmission power is used for communication. Next, in the case of communication between the A-2 station and the E-3 station, the distance is about 7 km and the reception level is about L2. Therefore, the first save transmission power of 2.7 W is sufficient. Next, in the case of communication between the A-3 station and the D-2 station, the distance is about 5 km and the reception level is about L3. The second save transmission power may be about 1.8W. In the case of communication between the A-4 station and the C-1 station, the distance is close to 3 km and the reception level is also high at L4, so the third save transmission power is sufficient. In addition, communication at a closer distance, that is, A-5 station and B-0
When the distance is less than 1km like a station, the reception level is maximum L
In such a case, the economy transmission power is 100 in particular.
Communication can be sufficiently performed with a transmission power of mW or less.

FIG. 2 is a flow chart showing the operation in the save mode for saving the transmission power when the communication stations have the same rated transmission power. The figure will be described. When the setting of the save mode is judged, the reception counter is set to 0. In process 3, a desired reception level is set as the reference reception level. For example, when L3 is set, the reference reception level SRL = L3. This L3 is a medium level reception level of the full scale of the reception level. Communication is started in this state. First, mutual communication is performed at the rated transmission power, and the reception level is displayed by a level meter or decibel value each time reception is performed, and is stored in the memory. When the data is received N times, the stored data for N times is calculated and an average value is calculated, and a judgment box 9 compares it with the reference reception level SRL = L3 to judge whether the average value is large. If the average value is equal to or less than the average value, determination box 10 determines whether the save mode is ON or OFF. If the save mode is not OFF, the rated power transmission of process 4 is returned to and communication with the rated transmission power is continued.

Next, in the judgment box 9, the reference reception level S
When the average reception level is RL = L3 or more, the reception measurement counter is set to 0, and in process 12, communication is performed with the first save transmission power. The processes 12 to 17 are executed in the same manner as the processes 4 to 9 except for the change of the transmission power. In the process 17, if the same as the reference reception level SRL = L3, the save box is judged in the judgment box 19 for judging the save mode is off. If it is off, the save mode is ended, and if it is not off, the process returns to the process 12 to send the first save again. Continue communication with power.

Next, in the judgment box 17, the reference reception level S
If it is not the same as RL = L3, it is judged in the judgment box 18 whether the average reception level is above or below the reference reception level SRL = L3, and if it is below, the process returns to the process 4 and communication is performed with the rated transmission power. For example, in processing 20, the reception counter is set to 0, and in processing 21, communication is performed with the second save transmission power. The processing 21 to the judgment box 26 are the same as the processing 4 to the judgment box 9 and the processing 12 to the judgment box 17 described above, and the only difference is the change of the transmission power. In the judgment box 26, the average reception level is the reference reception level SR
If L = L3, the communication with the second save transmission power is continued. If not the same, judgment box 2
If the average reception level is greater than the reference reception level SRL = L3 in step 7, communication is performed by the third saved transmission power that is further saved as in steps 4 to 17 and this is the average reception level and the reference reception level SRL = L.
The above process is repeated until the same level as 3 or the minimum save transmission power is reached. On the other hand, if the average reception level is smaller than the reference reception level, the save transmission power is changed and communication is performed until they match.

The above is a description of one wireless station in the save mode in which the same rated transmission power communication is performed, but this communication partner station also communicates with the transmission power saved by exactly the same operation. Even if the reception level is lowered due to movement between the local station and the communication partner station during the communication in the save mode, the average value reception level is converged to the reference value reception level by selecting the judgment boxes 18 and 27. Although the S-meter or decibel display is used for the display, the decibel display can be a numerical display other than the meter-type display. Therefore, in the save mode, since the decibel value is changed and displayed at the time of setting the save or each stage of the save, it is possible to always know the receiving state by the decibel display of the save mode state.

If there is a difference in the rated transmission power between the communication partner stations, it is necessary for a large rated transmission power station to set the save transmission power close to the rated transmission power of the partner station before starting communication. is there. This is because when communicating with the rated transmission power with a difference, one station is saved too much and the reception level at the other station is too low, which may cause reverse control to increase the transmission power. Is also necessary.

FIG. 3 is a block diagram of a wireless communication device used in the present invention. The figure will be described. In the figure, 01 is an antenna, 02 is a transmitter, 03 is a receiver, 04 is a low-frequency amplifier, and 05 is a speaker. Reference numeral 06 is a control unit by a CPU that controls all of the wireless communication device, 07 is a display unit, 08
Is a storage unit, and 09 is a microphone amplifier and a microphone 010. The transmission unit 02 changes the rated transmission power of the transmission power, the first save transmission power, the second save transmission power, the third save transmission power, and the like, and the control is performed by the control unit 06. In addition, the control unit 06 also selects and sets all the controls by the selection setting and the save mode setting of the reception level divided into a plurality of stages.

[0019]

According to the transmission power saving method of the present invention, there are cases in which the transmission is performed at the rated transmission power or the reception level fluctuates due to movement. However, conventional reception level adjustment and AGC, If the transmission power can be set to the same level while the reception level is corrected by preamplifier amplification, etc., by setting the save mode, communication will be started from the transmission power of the same level and the reference reception level will be the set reception level. The transmission power is automatically reduced to the save transmission power with the transmission power lowered. This automatic convergence follows even when the reception level drops, and therefore transmission power is transmitted with the best save transmission power, and communication can be performed in the best reception state, so battery consumption is suppressed and communication is performed. Since the allowable time can be extended, there is a merit that the wireless communication device can be a very efficient wireless communication device, especially in a handy transceiver.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of a communication system of the present invention.

FIG. 2 is a flowchart illustrating a transmission power saving method of the present invention.

FIG. 3 is a block diagram of a wireless communication device used in the transmission power saving method of the present invention.

[Explanation of symbols]

 01 antenna 02 transmitter 03 receiver 04 low-frequency amplifier 05 speaker 06 CPU control unit 07 display unit 08 memory 09 microphone amplifier 010 microphone

Claims (2)

[Claims] 1. In a wireless communication device of a wireless communication system for performing mutual communication, a transmission power selecting means for selecting and transmitting one of a rated transmission power or one of a plurality of stages of save transmission power in which the transmission power is lowered as transmission power. And, divide the reception level of the received signal into multiple stages, select one and set it as the reference reception level,
And a coincidence detecting means for calculating a reception level for N times for every N times of reception, outputting it as an average reception level, and comparing it with the reference reception level and outputting a detection signal as to whether or not there is a coincidence. When the save mode is set, the transmission power selection means is controlled in accordance with the detection signal of the coincidence detection means to change the save transmission power step by step, and when the coincidence detection means detects a coincidence, the save at that stage is performed. A transmission power saving method characterized by communication using transmission power. 2. The average reception level used in the coincidence detection means is to store the reception level for N times in a memory, and read the data in the memory every N times of reception to perform an arithmetic operation to generate an average reception level. The transmission power saving method according to claim 1, which is characterized in that.