JP2001168796A - Communication terminal, communication system and storage medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To properly adjust the transmission strength of a radio signal in the communication terminal at a transmission side in accordance with the intensi ty of the received radio signal when the radio signal is transmitted/received between plural communication terminal. SOLUTION: When CPU 2 receives a radio signal transmitted from a communication destination through an antenna 7 in communication terminal 1 transmitting/receiving the radio signal with the prescribed communication terminal, a signal strength detection part in radio transmission/reception terminal 6 detects the signal strength at the time of reception and CPU controls the current supplied to a high frequency amplifier in the radio transmission/reception terminal 6 based on detected signal strength. Thus, transmission signal strength is adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication terminal device for adjusting transmission intensity during wireless communication, a communication system using the communication terminal device, and a storage medium storing these control programs.

[0002]

2. Description of the Related Art Normally, when wireless communication is performed between a plurality of communication terminals, the reception strength of a wireless signal greatly changes depending on the surrounding communication environment and the distance between the communication terminals.

[0003]

Generally, in a communication terminal device on the transmission side, a transmission waveform is amplified by a high-frequency amplifier or the like, and R
Transmit via the F section. In addition, the transmission intensity at the time of transmission in the communication terminal device on the transmission side, that is, the amplification factor in the high-frequency amplifier is often a constant value.

[0004] For this reason, when the environment of the wireless communication is favorable, the communication terminal device on the receiving side can receive the wireless signal with a sufficient receiving strength. In this case, as described above,
Assuming that the transmission intensity is constant in the communication terminal device on the transmission side, there is a problem that transmission power is consumed more than necessary. Further, in the communication terminal device on the receiving side, there is a problem that the amplifier for amplifying the received signal may be saturated because the receiving intensity is too high.

In order to solve the above-mentioned problems, the present invention provides a method for transmitting and receiving a radio signal between a plurality of communication terminal devices, the transmission intensity of the radio signal in the communication terminal device on the transmitting side according to the reception intensity of the radio signal. It is an object to be able to appropriately adjust.

[0006]

The present invention has the following features in order to solve such a problem. In the following description of the means, a configuration corresponding to the embodiment is shown by parentheses as an example. Reference numerals and the like are reference numerals and the like in the drawings described later.

According to a first aspect of the present invention, in a communication terminal device (1) for transmitting / receiving a radio signal to / from a predetermined communication device, the reception strength when the radio signal transmitted from the communication device is received is determined. Receiving strength determining means (for example, FIG.
CPU 2 for performing the processing shown in step S16) and transmission intensity adjusting means for adjusting the transmission intensity for transmitting its own radio signal based on the reception intensity determined by the reception intensity determination means (for example, step S16 in FIG. 7). A CPU 2 that performs the process shown in S18), a transmitting unit that transmits a wireless signal to the communication device with the transmission intensity adjusted by the transmission intensity adjusting unit (for example, the CPU 2 that performs the process shown in step S24 of FIG. 7), It is characterized by having.

According to the first aspect of the present invention, when transmitting / receiving a radio signal to / from a predetermined communication device, the transmission intensity is adjusted according to the reception intensity of the received radio signal. For example, when the communication environment is favorable, the transmission intensity can be reduced. As a result, it is possible to save power consumption at the time of transmission without transmitting a radio signal with a transmission intensity higher than necessary, and to prevent a failure such as saturation of a reception amplifier due to too strong reception intensity. . Furthermore, for example, when the communication environment is poor and it is difficult to receive a radio signal, the transmission intensity can be increased. Therefore, more stable transmission and reception of the radio signal can be performed, and more reliable communication can be performed.

In particular, when a predetermined communication device transmits and receives a radio signal to and from a communication terminal device of the same type, the reception strength of the communication terminal device of the communication destination and the reception strength of the communication terminal device depend on the communication environment. Change in the same way. For this reason,
By adjusting the transmission intensity based on its own reception intensity, it is possible to obtain a suitable reception intensity even at the communication terminal device at the communication destination, so that more reliable communication can be performed.

According to a third aspect of the present invention, in a communication terminal device for transmitting / receiving a radio signal to / from a predetermined communication device, information indicating the reception strength of the radio signal transmitted to the communication device is received from the communication device. At this time, based on the information, a transmission intensity adjusting unit (for example, CPU 2 that performs the processing shown in step S59 of FIG. 11) that adjusts a transmission intensity for transmitting a wireless signal to the communication device, and the transmission intensity adjusting unit And transmitting means for transmitting a wireless signal to the communication device with the adjusted transmission intensity (for example, the CPU 2 performing the processing shown in step S65 of FIG. 11).

According to the third aspect of the present invention, if a predetermined communication device capable of transmitting information indicating the reception intensity at the time of reception is used as the communication device of the communication destination, the information indicating the reception intensity is transmitted to the communication device. , The transmission strength is adjusted based on this information. This makes it possible to maintain a good reception state in the communication device of the communication destination, prevent a failure such as saturation of the reception amplifier, and perform more reliable communication.
Further, if the transmission intensity is reduced within a range where the reception intensity of the communication apparatus at the communication destination is good, power consumption during transmission can be saved while maintaining the necessary and sufficient transmission intensity.

According to a fourth aspect of the present invention, in the communication system for transmitting and receiving a radio signal between a plurality of communication terminal devices, the communication terminal device on the receiving side transmits the radio signal transmitted from the communication terminal device on the transmitting side. A receiving strength determining means for determining the receiving strength at the time of reception (for example, step S7 in FIG. 12)
And a reception intensity information transmitting means for transmitting information indicating the reception intensity determined by the reception intensity determination means to the communication terminal device on the transmission side (for example, in step S72 of FIG. 12). CPU that performs the processing shown
2) the communication terminal device on the transmitting side, when receiving from the communication terminal device on the receiving side information indicating the reception strength of the radio signal transmitted to the communication terminal device on the receiving side, Transmission intensity adjusting means for adjusting the transmission intensity for transmitting a radio signal to the communication terminal device on the receiving side (for example, C which performs the processing shown in step S59 in FIG. 11).
PU2), and transmission means (for example, CPU2 for performing the processing shown in step S65 in FIG. 11) for transmitting a radio signal to the communication terminal device on the receiving side based on the transmission intensity adjusted by the transmission intensity adjustment means. , Is characterized.

According to the fourth aspect of the present invention, the communication terminal device on the receiving side transmits information indicating the reception intensity at the time of reception, and the communication terminal device on the transmitting side adjusts the transmission intensity based on the information. adjust. For this reason, in the communication terminal device on the receiving side, it is possible to prevent a failure due to too strong reception intensity and to perform more reliable communication. In addition, the communication terminal device on the transmitting side does not transmit at a transmission intensity higher than necessary, so that power consumption during transmission can be saved.

In particular, when the transmitting-side communication terminal device and the receiving-side communication terminal device are configured by the same type of communication terminal device, an appropriate reception strength is set in both the receiving-side and transmitting-side communication terminal devices. By keeping this, the reliability during communication can be further increased, and power consumption can be effectively saved.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a communication terminal apparatus according to the present invention; FIG.

[First Embodiment] First, FIG. 1 is a block diagram showing a configuration of a communication terminal device 1 according to a first embodiment of the present invention. As shown in FIG. 1 is a CPU (Central Processing Unit) 2, RAM
(Random Access Memory) 3, storage device 4, storage device 4
Each of the units except the storage medium 5 and the antenna 7 includes a storage medium 5, a wireless transmission / reception device 6, an antenna 7 included in the wireless transmission / reception device 6, a transmission control unit 8, an input unit 9, a display unit 10, and a printing unit 11. Are connected to the bus 12.

The CPU 2 develops a system program stored in the storage device 4 and an application program specified from various application programs corresponding to the system into a work area (not shown) in the RAM 3, And temporarily stores various instructions or data input from the RAM 3 in accordance with the input instructions and the input data in accordance with the application programs stored in the storage device 4 and stores the processing results in the RAM 3. In addition to the storage, the display information for displaying the processing result is generated and output to the display unit 10. Then, according to an input instruction from the input unit 9,
The processing result in the RAM 3 is stored in a specified storage destination.

When communicating with the communication terminal device 1 having the same configuration as the communication terminal device 1, the CPU 2 executes a transmission process (FIG. 7) or a reception process (FIG. 8) described later. Then, the communication result is stored in the RAM 3, and table information for displaying the communication result is generated and output to the display unit 10.

The RAM 3 forms a work area for temporarily storing various programs executed by the CPU 2, data relating to these programs, and the like.

The storage device 4 has a storage medium 5 in which programs, data and the like are stored in advance, and this storage medium 5 is constituted by a magnetic or optical recording medium or a semiconductor memory. The storage medium 5 is fixedly provided in the storage device 4 or is detachably mounted. The storage medium 5 includes the system program, various application programs corresponding to the system, and a communication control processing program. , And data processed by each processing program, document data, and the like. A part or all of the programs, data, and the like stored in the storage medium are transmitted from another device such as a server or a client to a transmission control unit 7 via a transmission medium such as a network line.
May be received from the server and stored. Further, the storage medium may be a storage medium of a server constructed on a network. Further, the program may be configured to be transmitted to a server or a client via a transmission medium such as a network line and installed in these devices.

As will be described later, the radio transmitting / receiving device 6 includes a modulator for transmitting transmission data, a high-frequency amplifier, and the like, and a reception amplifier for receiving data transmitted from a communication terminal device of a communication destination. It has a demodulator and the like. An antenna 7 is connected to the wireless transmission / reception device 6, and transmits / receives a wireless signal to / from a communication terminal device of a communication destination via the antenna 7.

The transmission control unit 8 has a modem (MODEM: MO
dulator / DEModulator) or terminal adapter (T
A: Terminal Adapter) and controls communication with an external device via a communication line such as a telephone line or an ISDN line. The modem modulates digital data processed by the CPU into an analog signal in the frequency band of the telephone line in order to communicate with an external device such as a personal computer via the telephone line. The terminal adapter is a device that demodulates the input analog signal into a digital signal.
In order to communicate with an external device such as a personal computer via an ISDN line, an existing interface is used.
This is a device for converting to an interface compatible with SDN.

The input unit 9 includes a keyboard provided with cursor keys, numeric input keys, and various function keys. The CPU 9 sends a press signal corresponding to a key pressed on the keyboard to the CPU.
Output to 2. Note that the input unit 9 may include a pointing device such as a mouse and a touch panel, and other input devices as necessary.

The display unit 10 is a CRT (Cathode Ray Tub).
e) and a display screen composed of an LCD (Liquid Crystal Display) or the like, based on display information input from the CPU 2, input contents in the input unit 9, contents of data transmitted / received via the wireless transmitting / receiving device 6, and the like. Is displayed on the display screen.

The printing unit 11 includes various printing devices such as a laser printer, an ink jet printer, a sublimation or thermal transfer printer, and a dot impact printer.
On the basis of the print information input from 2, the content of the data received via the wireless transmission / reception device 6, the content of the input operation in the input unit 9, and the like are printed on a predetermined sheet.

Here, the configuration of the wireless transmission / reception device 6 will be described in detail with reference to FIGS. FIG. 2 is a block diagram showing the internal configuration of the wireless transmitting / receiving device 6. As shown in FIG. 2, the wireless transmitting / receiving device 6 includes a modulator 61, a high-frequency amplifier 62, a duplexer 63, a current adjusting unit 64, and a receiving amplifier 65. , A demodulator 66, a reception intensity detector 67, and the like.

In the radio transmission / reception device 6 shown in FIG. 2, transmission data input from the CPU 2 is modulated by the modulator 61, further amplified by the high frequency amplifier 62, input to the duplexer 63, and output to the duplexer 63.
Is transmitted from the antenna 7 via. Also, the antenna 7
Is split by the duplexer 63 into a transmission radio signal and input to the reception amplifier 65. Then, the received wireless signal is amplified by the receiving amplifier 65, input to the demodulator 66, demodulated by the demodulator 66, and output to the CPU 2 as received data.

FIGS. 3A and 3B are diagrams showing a waveform of a received signal in each section of the wireless transmitting / receiving device 6, wherein FIG. 3A shows a received wireless signal input from the duplexer 63 to the receiving amplifier 65, and FIG. 6 shows the output signal of the receiving amplifier output from the demodulator 66, and FIG. 7C shows the output signal of the demodulator output from the demodulator 66. As shown in FIG. 3, the received radio signal demultiplexed by the duplexer 63 is converted from the state shown in FIG. 3A to the state shown in FIG.
Amplified by 5. 3 through a demodulation process by a demodulator 66 having an A / D converter, for example.
The signal is output to the CPU 2 as a signal having a waveform as shown in FIG.

Here, when the reception intensity of the radio signal received by the antenna 7 is very large, the amplification in the reception amplifier 65 results in saturation of the reception amplifier 65, and as shown in FIG. A desirable waveform may not be obtained. Therefore, it is desirable to avoid reception at an extremely high reception intensity. Further, when the reception intensity is very small, even if the amplification is performed in the reception amplifier 65,
Fig. 3 (c) because the received waveform is extremely distorted
There is a possibility that a desirable waveform as shown in FIG.

Therefore, in the radio transmission / reception device 6, the reception intensity is detected by the reception intensity detection section 67 based on the reception data output from the demodulator 66, and based on the detected reception intensity, the high-frequency amplifier 62 The amplification factor is adjusted by the current adjusting unit 64.

That is, the CPU 2 outputs the adjustment data generated as described later to the current adjustment unit 64, and adjusts the current in the current adjustment unit 64. The adjustment data is data for instructing an increase and a decrease in the current supplied from the current adjustment unit 64 to the high-frequency amplifier 62. If the adjustment data is “± 0”, the current adjustment unit 64 sends the high-frequency amplifier 6
2, the current supplied to the high-frequency amplifier 62 decreases when the adjustment data has a negative value. When the adjustment data has a positive value, the current supplied to the high-frequency amplifier 62 increases. Then, the larger the absolute value of the adjustment data is, the larger the current adjustment width in the current adjustment unit 64 is. As described above, the current supplied to the high-frequency amplifier 62 is adjusted according to the value of the adjustment data input from the CPU 2 to the current adjustment unit 64, and the transmission intensity at the time of transmission changes.

FIG. 4 is a block diagram showing the internal configuration of the reception intensity detecting section 67. As shown in the figure, the reception intensity detection unit 67 includes a P / S (Parallel / Serial) converter 68,
, N, and a reference voltage supply circuit 81 including a plurality of reference voltage supply units 1, 2,..., N.

The comparator array section 71 is configured by arranging n (n is an integer) comparators numbered 1 to n, and each of the comparators 1 to n has a reference voltage supply circuit. The reference voltages having different voltage values are supplied from the reference voltage supply units 1 to n included in 81. The output terminals of the comparators 1 to n are connected to the P / S converter 68.

The reference voltage supply circuit 81 includes n reference voltage supply units numbered 1 to n. Therefore,
The number of reference voltage supply units 1 to n included in the reference voltage supply circuit 81 and the number of comparators 1 to n of the comparator array unit 71 are the same. Each of the reference voltage supply units 1 to n is connected to each of the comparators 1 to n, and outputs a reference voltage having a different voltage value to each of the comparators 1 to n.
Supply to

In this embodiment, it is assumed that the voltage value supplied from the reference voltage supply units 1 to n increases as the number assigned to each reference voltage supply unit increases.
That is, the reference voltage supply unit 1 supplies the reference voltage having the lowest voltage value to the comparator 1, and the reference voltage supply unit n compares the reference voltage having the highest voltage value among the reference voltage supply units 1 to n with the comparator. n.

Each of the comparators 1 to n of the comparator array 71
Is supplied with a demodulator output signal from the demodulator 66. Each of the comparators 1 to n includes a voltage value of the reference voltage input from the reference voltage supply units 1 to n and a voltage value of the demodulator output signal. And outputs “1” when the voltage value of the demodulator output signal is larger. In each of the comparators 1 to n,
When the voltage value of the demodulator output signal is smaller than the voltage value of the reference voltage, “0” is output from the comparators 1 to n. Then, the output values of “0” or “1” are compared with comparators 1 to
n is input to the P / S converter 68 from the output terminal.

Here, in the reception intensity detector 67, the output values output from the comparators 1 to n are handled as n-bit (n is the above integer) serial data. That is,
The output values from the comparators 1 to n respectively correspond to 1-bit values, the output value of the comparator 1 becomes the value of the least significant bit, and the output value of the comparator n becomes the value of the most significant bit.

For example, n is 8, and the reference voltage supply unit 1
Are output values of 1,1,1,1,0,0,
If it is 0,0, the input from the comparator array unit 71 is 8
Handled as bit data “000011111”. This allows for efficient data handling,
This contributes to cost reduction and simplification of the circuit configuration.

The P / S converter 68 outputs the output values output from each of the comparators 1 to n of the comparator array section 71 to the CPU 2 as n-bit intensity data. At this time, P /
The output values of the comparators 1 to n are input in parallel to the S converter 68, but the P / S converter 68 converts the output values of the comparators 1 to n into serial data and outputs the serial data to the CPU 2. I do. Specifically, the P / S converter 68 temporarily holds the output values from the comparators 1 to n and serializes the output values of the comparators 1 to n with the output value of the comparator n at the top. Output as data.

Then, the CPU 2 controls the reception intensity detecting section 67
The adjustment data is generated by referring to the intensity conversion table 4a stored in the storage device 4 on the basis of the intensity data output from. FIG. 5 is a diagram schematically illustrating the configuration of the intensity conversion table 4a.

The intensity conversion table 4a stores the P / S converter 6
This is a table in which 8-bit n-bit intensity data and adjustment data input from the CPU 2 to the current adjustment unit 64 are associated with each other. By referring to the intensity conversion table 4a, the intensity data can be easily converted from the adjustment data. Can be generated.

FIG. 5 shows a case where n is 8 as an example of the intensity conversion table 4a. For example, adjustment data corresponding to 8-bit intensity data “000011111” is:
“± 0”. The adjustment data is data for instructing the current adjustment unit 64 to increase or decrease the current. If the adjustment data is “± 0”, it indicates that the current in the current adjustment unit 64 is optimal and adjustment is unnecessary.

As described above, in the first embodiment,
To the comparators 1 to n of the comparator array unit 71, a smaller reference number is input with a lower reference voltage. That is,
Since the comparator n compares the highest reference voltage value among the reference voltage supply units 1 to n with the voltage value of the demodulator output signal, if the output value of the comparator n is “1”, the demodulator The voltage value of the output signal is the maximum in a range that can be determined by the reception intensity detection unit 67. At this time, since the output values of the comparators 1 to (n-1) are all "1", the intensity data is "111111".
11 ". Accordingly, in the intensity conversion table 4a, the current in the current adjusting unit 64 is reduced as much as possible in association with the intensity data “11111111”.
4 "is set.

The output value of the comparator n is "0",
When the output value of the comparator (n−1) is “1”, the intensity data is “0111111111”. The adjustment data corresponding to the intensity data is “−3”. in this case,
The current supplied from the current adjustment unit 64 to the high-frequency amplifier 62 decreases in a smaller width than when the adjustment data is “−4”. Further, all comparators 1 to 1 of the comparator array unit 71
If the output value of n matches “0”, that is, if the intensity data is “00000000”, it indicates that the voltage value of the demodulator output signal is extremely low, and the corresponding adjustment data is “+4”. .

Then, the CPU 2 executes the intensity conversion table 4
The adjustment data generated with reference to a is output to the current adjustment unit 64 (FIG. 2), and the current supplied to the high-frequency amplifier 62 is adjusted. By this adjustment, the amplification factor in the high-frequency amplifier 62, that is, the transmission intensity from the antenna 7 changes.

Next, the operation of this embodiment will be described. First, transmission processing and reception processing at the time of communication performed by the CPU 2 when performing wireless communication using the communication terminal device 1 will be described with reference to flowcharts shown in FIGS.

Here, the program for realizing each function described in these flowcharts is stored in a recording medium in the form of a readable program code, and the CPU 2 executes an operation according to the program code. Execute sequentially. Further, the CPU 2 can also sequentially execute the operation according to the above-described program code transmitted via the transmission medium. That is, in addition to the recording medium,
The operation specific to this embodiment can also be performed using a program / data externally supplied via a transmission medium.

The first embodiment exemplifies a case in which a plurality of communication terminal apparatuses 1 and 1 transmit and receive radio signals. For this reason, the transmission processing (FIG. 7) described below shows the operation in the communication terminal device 1 on the transmission side.
Similarly, the reception process (FIG. 8) shows the operation in the communication terminal device 1 on the receiving side. Further, it is assumed that the plurality of communication terminal apparatuses 1 and 1 in the first embodiment have the same communication performance.

FIG. 6 is a general flow showing communication processing in the communication terminal device 1. In the process shown in FIG. 6, first, the CPU 2 determines whether or not there is an input from the input unit 9 (step S1). Here, when an input operation on the input unit 9 is detected, a process corresponding to the input content is executed (Step S2), and the process returns to Step S1.

If it is determined in step S1 that an input operation on the input section 9 has not been detected, it is determined whether or not to execute communication (step S3). If it is determined that the communication is not to be performed, the process returns to step S1. If the communication is to be performed, the process proceeds to step S4 to determine whether to perform transmission or reception.

If it is determined in step S4 that the transmission is to be performed, the process proceeds to step S5, where a transmission process (FIG. 7) described later is executed.
Return to If it is determined in step S4 that reception is to be performed, the process proceeds to step S6, where a reception process (FIG. 8) described later is executed, and after the process, the process returns to step S1.

FIG. 7 is a flowchart showing in detail the transmission processing shown in step S5 of FIG. The transmission process will be described with reference to FIG. In FIG. 7,
Arrows shown on the right side of the flowchart indicate data transmitted / received to / from the communication terminal device 1 on the receiving side.

In the transmission processing shown in FIG.
First, the adjustment data is output to the current adjustment unit 64 to adjust the reference transmission intensity (step S11). The reference transmission intensity is an output to be set as an initial state when transmitting and receiving a wireless signal, is set in the storage device 4 in advance, and can be arbitrarily set and changed by an input operation on the input unit 9. .

Subsequently, the CPU 2 transmits the dummy data A to the communication terminal device 1 that executes the receiving process (Step S12). The dummy data A is data transmitted as a trial for adjusting the transmission intensity, and has nothing to do with the content of the data transmitted in step S24 described later.

After transmitting the dummy data A, the CPU 2
Determines whether the response data B has been transmitted from the communication terminal device 1 on the receiving side (step S13). The response data B is data transmitted by the communication terminal device 1 that has received the dummy data A as confirmation of reception of the dummy data A in a reception process (FIG. 8) described later.

If the response data B has not been received in step S13, the CPU 2 proceeds to step S14 to determine whether or not a predetermined time has elapsed since the transmission of the dummy data A in step S12. I do.

If it is determined in step S14 that the predetermined time has not elapsed since the transmission of the dummy data A, the CPU 2 returns to step S13 and transmits the dummy data A again. If it is determined that the predetermined time has elapsed, the process proceeds to step S15, where the dummy data A
It is determined whether or not transmission of the message has been tried a predetermined number of times or more. If the number of trials has not reached the predetermined number, the process returns to step S12 to transmit the dummy data A again. That is, by the determination in step S15, the CPU
2 indicates that the response data B has not been received (step S
13; No), wait for a fixed time, and then transmit the dummy data A again. If the response data B has not been received after the dummy data A has been transmitted a predetermined number of times (step S15; Yes), the process proceeds to step S23 to be described later, an error is notified, and the process is terminated.

On the other hand, when the response data B has been received in step S13, the CPU 2 refers to the intensity data input from the reception intensity detector 67 when the response data B was received, and determines the reception intensity ( Step S16).

Then, the CPU 2 determines whether or not the transmission intensity is appropriate based on the reception intensity determined in step S16 (step S17). This step S17
If it is determined that the transmission intensity is not appropriate, the process proceeds to step S18, in which the adjustment intensity is adjusted by outputting adjustment data to the current adjustment unit 64, and the process returns to step S12.

In the first embodiment, transmission and reception are performed between the plurality of communication terminal devices 1 and 1, so that the specifications of the receiving side device and the transmitting side device are common. Accordingly, the reception strength of the communication terminal device 1 on the receiving side is substantially the same as the reception strength when the response data B is received by the communication terminal device 1 on the transmission side. The intensity can be adjusted.

If it is determined in step S17 that the reception intensity detected by the reception intensity detection section 67 is appropriate, the CPU 2 shifts to step S19 to request the communication terminal device 1 on the receiving side to start data transmission. Send C.

Thereafter, the CPU 2 determines whether or not the reception ready response D has been received (step S20). The reception-prepared response D is the communication terminal device 1 on the receiving side that has received the data transmission start request C in the reception process (FIG. 8) described later.
Is a response transmitted when the preparation for receiving data transmitted from the communication terminal device 1 on the transmission side is completed. Therefore, after receiving the reception ready response D, the communication terminal device 1 on the transmission side can transmit data.

If no ready-to-receive response D has been received in step S20, the CPU 2 moves to step S21 and determines whether or not a predetermined period of time has elapsed since the data transmission start request C was transmitted in step S19. It is determined whether or not.

If it is determined in step S21 that the predetermined time has not elapsed, the CPU 2 proceeds to step S20.
Return to If it is determined that the predetermined time has elapsed, the process proceeds to step S22, and the data transmission start request C
It is determined whether or not transmission of the message has been tried a predetermined number of times or more. If the number of trials has not reached the predetermined number, the process returns to step S19, and the data transmission start request C
Send again. That is, by the determination in step S15,
When having not received the reception ready response D (Step S20; No), the CPU 2 waits for a certain period of time and then transmits the data transmission start request C again. Then, if the reception ready response D has not been received after transmitting the data transmission start request C a predetermined number of times (step S22; Yes), the process proceeds to step S23.

In step S23, the CPU 2 generates display information for guiding the occurrence of the error and outputs the display information to the display unit 10, and displays a screen for guiding the occurrence of the error on the display screen of the display unit 10. Then, the process ends.

In step S20, the reception ready response D
Is received, the CPU 2 proceeds to step S24 to transmit the transmission data E. Then, step S2
The process proceeds to step S5 to determine whether or not the transmission has been completed. If the transmission has not been completed, the process returns to step S24 to transmit the transmission data E. After the transmission of the data to be transmitted ends (step S25; Yes), the CPU 2 transmits a transmission end notification F indicating the end of the transmission to the communication terminal device 1 on the receiving side, and ends the processing.

Next, the receiving process executed in the communication terminal device 1 on the receiving side will be described with reference to FIG. FIG. 8 is a flowchart showing in detail the reception processing shown in step S6 of FIG. In FIG. 8, arrows illustrated on the left side of the flowchart indicate data transmitted / received to / from the communication terminal device 1 on the transmission side.

CPU 2 starts the receiving process shown in FIG. 8 by receiving dummy data A transmitted from communication terminal device 1 on the transmitting side in step S12 of the transmitting process shown in FIG.

After starting the process, at step S31, C
The PU 2 transmits the response data B to the communication terminal device 1 on the transmitting side. Subsequently, the CPU 2 determines the reception intensity when receiving the dummy data A (step S2).
32) Then, the process shifts to step S33 to determine whether or not the reception strength determined in step S32 is appropriate.

If it is determined in step S33 that the reception intensity is not appropriate, the CPU 2 proceeds to step S34.
Then, the current supplied from the current adjusting unit 64 to the high-frequency amplifier 62 is adjusted, and the process proceeds to step S35. If it is determined in step S33 that the reception intensity is appropriate, the process proceeds to step S35 without performing the process in step S34.

In step S35, CPU 2 determines whether or not data transmission start request C transmitted from communication terminal device 1 on the transmitting side has been received. If the data transmission start request C has not been received, the process proceeds to step S36 to determine whether or not the dummy data A has been received.

In step S36, dummy data A
Is received, the transmission intensity is adjusted in the communication terminal device 1 on the transmission side, and the dummy data A is transmitted again. Therefore, the process returns to step S31 to start the process. If the dummy data A has not been received in step S36, the process proceeds to step S37, and it is determined whether or not a predetermined time or more has elapsed since the response data B was transmitted in step S31.

If it is determined in step S37 that the predetermined time has not elapsed, the CPU 2 proceeds to step S3.
Returning to step S5, if the predetermined time has elapsed, the process proceeds to step S43 described below, an error is notified, and the process ends.

On the other hand, if the data transmission start request C has been received in step S35, the flow shifts to step S38 to transmit a reception ready response D to the communication terminal device 1 on the transmission side. Subsequently, the CPU 2 determines whether or not the transmission data E transmitted from the communication terminal device 1 on the transmission side has been received,
If the transmission data E has been received, the process proceeds to step S40, the content of the transmission data E is received, and the process proceeds to step S41. If the transmission data E is not received,
The process moves to step S41 without performing the process in step S40.

In step S41, it is determined whether or not the transmission end notification F transmitted from the communication terminal device 1 on the transmitting side has been received. If the transmission end notification F has not been received, the process proceeds to step S42. In step S42, step S
At 39, it is determined whether or not a certain time or more has elapsed since the determination of whether or not the transmission data E has been received. Step S42
If it is determined that the predetermined time has not elapsed, the CPU 2 returns to step S39. If the predetermined time has elapsed, the CPU 2 proceeds to step S43.

In step S43, the CPU 2 generates table information for displaying and guiding that an error has occurred, outputs the table information to the display unit 10, and displays a screen for guiding the occurrence of the error on the display screen of the display unit 10. Is displayed, and the process ends.

In step S41, the transmission end notice F
Is received, the CPU 2 ends the process.

In each of the processes shown in FIGS. 7 and 8, the time used as a reference for the determination in steps S14, S21, S37 and S42 and the number of times used as the reference for the determination in steps S15 and S22 are preset. , Stored in the storage device 4, but can be arbitrarily set and changed by an input operation on the input unit 9.

As described above, according to the communication terminal device 1 in the first embodiment of the present invention, when transmitting / receiving a radio signal to / from a communication terminal device 1 of the same type, transmission processing as a transmission side is performed. In the transmission process, the dummy data A is transmitted to the communication terminal device 1 on the reception side, and when the response data B is transmitted from the communication terminal device 1 on the reception side, the response process is performed. The reception strength at the time of receiving the data B is determined by the reception strength detection unit 67 in the wireless transmission / reception device 6. Then, adjustment data is generated by referring to the intensity conversion table 4a based on the intensity data indicating the reception intensity determined by the reception intensity detection unit 67, and supplied from the current adjustment unit 64 to the high-frequency amplifier 62 based on the adjustment data. The transmission current is adjusted by adjusting the current to be transmitted.

As a result, the transmission intensity at the time of transmitting the radio signal is adjusted to an appropriate value, so that the signal is not transmitted at an excessively high transmission intensity. For this reason, unnecessary seed coat power at the time of transmission can be saved, and the communication terminal device 1 on the receiving side can be saved.
In this case, it is possible to prevent occurrence of a trouble such as saturation of the receiving amplifier 65 due to excessively high receiving intensity.

That is, since the communication destination is the same type of communication terminal device 1, the reception intensity of the dummy data A in the reception side communication terminal device 1 and the reception intensity of the response data B in the transmission side communication terminal device 1 are different. equal. Therefore, in the communication terminal device 1 on the transmitting side, the transmission intensity can be adjusted to an appropriate value based on the reception intensity of the response data B.

In the first embodiment,
The transmission and reception of the dummy data A and the response data B are performed, and step S18 (FIG. 7) and step S34 (FIG. 8)
After the transmission intensity is adjusted in the transmission data E,
Is sent. Therefore, before transmitting the transmission data E to be transmitted, the transmission intensity is adjusted to an appropriate value. Therefore, when transmitting important data, a suitable communication environment is realized, and the data is reliably transmitted. It is possible to provide the communication terminal device 1 which can transmit and has higher reliability.

In the transmission process, step S1
Since the dummy data A is transmitted again after the transmission strength is adjusted in FIG. 8 (FIG. 7), the transmission strength is adjusted to a more appropriate value, and the reliability of the communication terminal device 1 can be further improved.

Further, in the receiving process, step S7
Since the transmission intensity is adjusted in step 7, both the communication terminal device 1 on the transmission side and the communication terminal device 1 on the reception side can transmit and receive wireless signals at a suitable transmission intensity.

Note that, in the first embodiment,
After transmitting the data transmission start request C in the transmission process (FIG. 7), the transmission intensity is not adjusted. However, the present invention is not limited to this.
The transmission intensity may be adjusted each time a predetermined amount is transmitted. In this case, an effect is obtained that even if the communication environment changes during communication, it is possible to quickly respond.

In the first embodiment,
The comparator 1 included in the comparator array unit 71 is controlled by the CPU 2.
Although the transmission intensity is adjusted by referring to the intensity conversion table 4a based on the output values of .about.n, the present invention is not limited to this. The signal waveform may be directly input to an A / D converter to generate digital data, and the CPU 2 may generate adjustment data based on the digital data. That is, the method of determining the reception intensity is not limited to the above method, and other details can be arbitrarily changed.

[Modification] Next, a modification of the first embodiment of the present invention will be described. FIG. 9 is a block diagram illustrating a configuration of a wireless transmission / reception device 60 as a modification of the embodiment. In the block diagram shown in FIG. 9, components having the same configuration as in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

The radio transmission / reception device 60 shown in FIG. 9 includes a modulator 61, a high-frequency amplifier 62, a duplexer 63, a reception amplifier 65, and a demodulator 66, a reception intensity detection unit 601 and a current adjustment unit 602. You. The reception intensity detection unit 601 generates a signal for adjusting the transmission intensity based on the reception amplifier output signal obtained by amplifying the reception radio signal demultiplexed by the duplexer 63 by the reception amplifier 65 and outputting the current. Output to the adjustment unit 602. Current adjuster 60
2 changes the amplification factor in the high-frequency amplifier 62, that is, the transmission intensity, by changing the current supplied to the high-frequency amplifier 62 based on the signal input from the reception intensity detection unit 601.

FIG. 10 is a circuit diagram showing in detail the configuration of the main part of the radio transmitting / receiving apparatus 60 including the above-mentioned reception intensity detecting section 601 and current adjusting section 602. As shown in FIG. 10, a reference voltage supply unit 603 that supplies a reference voltage having a predetermined voltage value to the reception intensity detection unit 601 is connected to the reception intensity detection unit 601. Also, the reception intensity detection unit 601 and the current adjustment unit 6
02, a latch circuit 604 is provided.

The reception intensity detection unit 601 includes n (n is an integer) comparators C1, C2,..., Cn, and resistors R11, R12,.
n, and one of the two input terminals of each of the comparators C1 to Cn is connected to a line to which a reception amplifier output signal is input from the reception amplifier 65. Accordingly, the reception amplifier output signal is similarly input to all the comparators C1 to Cn.

The other end of the two input terminals of the comparator C1 is connected to one end of a resistor R11, and the input terminal of the comparator C2 is connected to a resistor R12. The resistors R11 to R1n are connected to the input terminals, respectively. The other end of the resistor R11 is connected to one end of the resistor R12, and the other end of the resistor R12 is connected to the other end of the resistor R13 (not shown). As described above, the resistors R11 to R1n are connected in series, and the resistors R11 to R3 closest to the reference voltage supply unit 603 are connected.
The other end of 1n is connected to the output terminal of the reference voltage supply unit 603.

Therefore, the reference voltage from the reference voltage supply unit 603 is input to the input terminals to which the reference voltages are input to the comparators C1 to Cn via different numbers of resistors R. The voltage values of the reference voltages input to .about.Cn are all different.

For example, the reference voltage from the reference voltage supply unit 603 is input to the comparator Cn closest to the reference voltage supply unit 603 in the reception intensity detection unit 601 via the resistor R1n. In addition, the comparator C (n−n−) disposed next to the comparator Cn on the reference voltage supply unit 603 side.
1) (not shown), a reference voltage further reduced by a resistor R1 (n-1) (not shown) from the reference voltage input to the comparator Cn is input. That is, the comparator C
(N-1) includes a resistor R1n and a resistor R1 connected in series.
1 (n-1), the reference voltage from the reference voltage supply unit 603 is input. Similarly, a reference voltage from the reference voltage supply unit 603 is input to the comparator C1 via n resistors R11 to R1n connected in series. Therefore, in the example shown in FIG.
, The reference voltage having the highest voltage value is input, and the comparator C1 is input with the reference voltage having the lowest voltage value.

Then, each of the comparators C1 to Cn compares the voltage value of the input reference voltage with the voltage value of the output signal of the receiving amplifier. Is output, and when the voltage value of the output signal of the receiving amplifier is higher, the value of the 'Lo' level is output.

The output values of the comparators C1 to Cn are temporarily stored in the latch
02 are input to the transistors TR1 to TRn. Note that the latch circuit 604 has a clear input terminal, and when a signal is input to the clear input terminal, the output value held in the latch circuit 604 is cleared.

The current adjusting section 602 includes n transistors TR1, TR2,..., TRn of the same number as the comparators C1 to Cn in the reception intensity detecting section 601 and n transistors TR1 to TRn corresponding to the transistors TR1 to TRn. Resistance R2
, R2n, and a resistor R3. These components are connected to a +5 V (volt) power supply supplied from outside the current control unit 602 and a ground terminal.

More specifically, the collector terminals of the transistors TR1 to TRn are connected to a + 5V power supply line. Further, the emitter terminals of the transistors TR1 to TRn are connected to one ends of the resistors R21 to R2n, respectively. The other ends of the resistors R21 to R2n are connected to an output line connected to the high frequency amplifier 62. The + 5V power supply line is connected to an output line to the high-frequency amplifier 62 via a resistor R3. Further, the output line to the high frequency amplifier 62 is grounded.

Further, the output values of the comparators C1 to Cn are input to the base terminals of the transistors TR1 to TRn via the latch circuit 604. That is, the transistors TR1 to TRn have a collector terminal of + 5V.
Are connected, the output values from the corresponding comparators C1 to Cn are input to the base terminal, and the emitter terminal
It is connected to the output line to the receiving amplifier 65 via the corresponding resistors R21 to R2n.

That is, the corresponding comparators C1 to Cn
Of the transistor TR1 when the output value of
To TRn are turned on and the transistor TR turned on
An emitter current flows from 1 to TRn to an output line to the receiving amplifier 65. As described above, since the current supplied from the current adjustment unit 602 to the receiving amplifier 65 depends on the number of the turned-on transistors TR1 to TRn, a value of the “Hi” level is output among the comparators C1 to Cn. As the number of comparators C1 to Cn increases, the current input to the high-frequency amplifier 62 increases.

Therefore, when the voltage value of the reception amplifier output signal input from the reception amplifier 65 to the reception intensity detection unit 601 is high, in the reception intensity detection unit 601, most of the comparators C1 to Cn have the “Lo” level. Output the value. In this case, in the current adjustment unit 602, the number of transistors TR1 to TRn that are turned on is small, so the current output to the high-frequency amplifier 62 is small, and the amplification factor in the high-frequency amplifier 62 is reduced. In addition, when the voltage value of the reception amplifier output signal output from the reception amplifier 65 is low, most of the comparators C1 to Cn output a value of “Hi” level.
Therefore, the number of transistors TR1 to TRn that are turned on increases, and the current output to the high-frequency amplifier 62 increases, so that the amplification factor in the high-frequency amplifier 62 increases.

As described above, according to this modification, similarly to the communication terminal device 1 according to the first embodiment, when the reception strength of the received radio signal is low, the radio signal is supplied to the high-frequency amplifier 62. Increasing the current increases the amplification factor and increases the transmission strength. If the reception strength is high, the transmission strength is reduced. Therefore, the transmission strength of the radio signal can be changed according to the reception strength. Further, in the present modification, the first CPU 2 does not perform the adjustment data generation process, and FIGS.
With the circuit configuration shown in FIG.

[Second Embodiment] Next, a second embodiment of the present invention will be described with reference to FIGS. The communication terminal device 1 according to the second embodiment has the same configuration as the communication terminal device 1 according to the first embodiment, and illustration and description of the configuration are omitted.

In the second embodiment, the communication terminal 1 transmits and receives radio signals to and from another communication terminal 1, and the communication terminal 1 and the other communication terminal 1 A communication system according to the fourth and fifth aspects of the present invention is configured by the above. In the second embodiment, the plurality of communication terminal devices 1 have different communication performances.

Note that the communication terminal device 1 performs transmission processing (FIG. 1).
The communication terminal device on the receiving side when performing 1) and the communication terminal device on the transmitting side when the communication terminal device 1 performs the receiving process (FIG. 12) have different configurations from the communication terminal device 1. It may be.

FIG. 11 is a flowchart showing a transmission process executed by the communication terminal device 1 on the transmission side. Note that, in FIG. 11, arrows illustrated on the right side of the flowchart indicate data transmitted / received to / from the communication terminal device 1 on the receiving side.

In the process shown in FIG. 11, the communication terminal device 1 first adjusts the transmission intensity to the reference transmission intensity by adjusting the current supplied from the current adjustment unit 64 to the high-frequency amplifier 62 (step S51). . Here, the reference transmission intensity is an output to be set as an initial state when transmitting and receiving a wireless signal, and is stored in advance in the storage device 4 and arbitrarily set and changed by an input operation on the input unit 9. It is possible.

Thereafter, the CPU 2 transmits the dummy data A to the communication terminal device 1 (not shown) on the receiving side (step S52). The dummy data A is data used for a trial for adjusting the transmission intensity, and has nothing to do with the content of the data transmitted in step S65 described later.

After transmitting the dummy data A, the CPU 2
Determines whether or not the determination strength data G transmitted from the communication terminal device 1 on the receiving side has been received (step S5).
3). The discrimination strength data G is stored in a reception process (FIG. 1)
In 2), the communication terminal apparatus 1 that has received the dummy data A indicates the result of determining the reception intensity when receiving the dummy data A, and the communication terminal apparatus 1 on the receiving side
Is transmitted to the communication terminal device 1 that performs the transmission process.

If no discrimination strength data G has been received in step S53, the CPU 2 proceeds to step S54, and determines whether or not a predetermined time has elapsed since the transmission of the dummy data A in step S52. Determine.

If it is determined in step S54 that the predetermined time has not elapsed, the CPU 2 proceeds to step S53.
Return to If it is determined that the predetermined time has elapsed, the process proceeds to step S55, and it is determined whether transmission of the dummy data A has been tried a predetermined number of times or more. If the number of trials has not reached the predetermined number, the process returns to step S52 to transmit the dummy data A again. That is, by the determination in step S55, the CPU 2
When the discrimination strength data G is not received (step S
53; No), wait for a predetermined time, and then transmit the dummy data A again. If the discrimination strength data G has not been received even after the dummy data A has been transmitted a predetermined number of times (Step S55; Yes), Step S2 described later is performed.
The process proceeds to step S3, where an error is notified, and the process ends.

If the discrimination strength data G has been received in step S53, the CPU 2 shifts to step S56, where the reception strength detector 6
The reception intensity is determined with reference to the intensity data input from step S7.

Then, CPU 2 transmits intensity data H indicating the reception intensity determined in step S56 to communication terminal device 1 on the receiving side (step S57).

After transmitting the intensity data H, the CPU 2
Based on the discrimination strength data G received in step S53, it is determined whether or not the own transmission strength is appropriate (step S5).
8) If it is determined that the transmission intensity is not appropriate, the process proceeds to step S59, where the transmission intensity is adjusted by outputting adjustment data to the current adjustment unit 64, and the process proceeds to step S60.
Move to. If it is determined in step S58 that the own transmission intensity is appropriate, the process proceeds to step S6.
Move to 0.

At step S60, CPU 2 transmits a data transmission start request C for starting data transmission to communication terminal device 1 on the receiving side. Then, it is determined whether or not the reception ready response D transmitted from the communication terminal device 1 on the receiving side has been received (step S61). The reception ready response D is a response that is transmitted when the communication terminal device 1 on the receiving side that has received the data transmission start request C is ready to receive data transmitted from the communication terminal device 1 on the transmitting side. . Therefore, if the reception ready response D is received, data can be transmitted from the communication terminal device 1 on the transmission side.

If the ready-to-receive response D has not been received in step S61, the CPU 2 shifts to step S62 to determine whether or not a predetermined time has passed since the data transmission start request C was transmitted in step S60. It is determined whether or not.

If it is determined in step S62 that the predetermined time has not elapsed, the CPU 2 proceeds to step S61.
Return to If it is determined that the predetermined time has elapsed, the process proceeds to step S63 and the data transmission start request C
It is determined whether or not transmission of the message has been tried a predetermined number of times or more. If the number of trials has not reached the predetermined number, the process returns to step S60 and the data transmission start request C
Send again. That is, by the determination in step S63,
When having not received the reception ready response D (step S61; No), the CPU 2 waits for a certain period of time, and then transmits the data transmission start request C again. If the data-ready response D is not received after transmitting the data transmission start request C a predetermined number of times (step S63; Yes)
s), and proceed to step S64.

In step S64, the CPU 2 generates table information for displaying and guiding that an error has occurred, outputs the table information to the display unit 10, and displays a screen for guiding the occurrence of the error on the display screen of the display unit 10. Is displayed, and the process ends.

If the reception ready response D is received in step S61, the CPU 2 moves to step S65,
The transmission data E is transmitted. Then, in a step S66, it is determined whether or not the transmission is completed, and if not, the process returns to the step S65 to transmit the transmission data E. Then, after the transmission of the data to be transmitted ends (step S66; Yes), the CPU 2 transmits a transmission end notification F, which is data indicating the end of the transmission, to the communication terminal device 1 on the receiving side, and performs processing. To end.

Next, the receiving process executed by the communication terminal device 1 on the receiving side will be described with reference to FIG. FIG. 12 is a flowchart showing the receiving process.
In FIG. 12, arrows shown on the left side of the flowchart indicate data transmitted / received to / from the communication terminal device 1 on the receiving side.

The CPU 2 starts the receiving process shown in FIG. 12 by receiving the dummy data A transmitted from the communication terminal device 1 (not shown) on the transmitting side. After the start of the process, in step S71, the CPU 2 determines the reception intensity when receiving the dummy data A, and transmits the determination result to the communication terminal device 1 on the transmission side as the determination intensity data G (step S72).

In the following step S73, CPU 2
Determines whether or not the intensity data H transmitted from the communication terminal device 1 on the transmitting side has been received. Then, the intensity data H
If not received, the process proceeds to step S74,
In step S72, it is determined whether or not a certain time or more has elapsed since the transmission of the determination strength data G.

If it is determined in step S74 that the predetermined time has not elapsed, the CPU 2 proceeds to step S7.
Returning to step 3, if the predetermined time has elapsed, the process proceeds to step S75 described below, and it is determined whether transmission of the determination strength data G has been tried a predetermined number of times or more. If the number of trials has not reached the predetermined number,
Returning to step S72, the discrimination strength data G is transmitted again. That is, by the determination in step S75, the CPU 2
Indicates that the intensity data H has not been received (step S
73; No), wait for a certain period of time, and then transmit the discrimination strength data G again. If the intensity data H has not been received after transmitting the discrimination intensity data G a predetermined number of times (step S75; Yes), the process proceeds to step S85, an error is notified, and the process ends.

In step S75, when intensity data H transmitted from the communication terminal device 1 on the transmitting side is received, C
The PU2 proceeds to step S76, and determines whether or not its own transmission intensity is appropriate based on the intensity data H. If it is determined that its own transmission intensity is not appropriate, the CPU 2 shifts to step S77, adjusts the supply current in the current adjusting unit 64, and shifts to step S78. If it is determined in step S75 that the reception strength is appropriate, the process proceeds to step S77 without performing the process in step S76.

In step S78, CPU 2 determines whether or not data transmission start request C transmitted from communication terminal device 1 on the transmitting side has been received. If the data transmission start request C has not been received, the process proceeds to step S79, and it is determined whether or not a predetermined time or more has elapsed since the transmission of the determination strength data G in step S72. Note that the time serving as the reference for the determination in step S79 is stored in the storage device 4 in advance, and can be arbitrarily set by an input operation from the input unit 9.

If it is determined in step S79 that the predetermined time has not elapsed, the CPU 2 proceeds to step S7.
Returning to step S8, if the predetermined time has elapsed, the process proceeds to step S85 described later, an error is notified, and the process ends.

On the other hand, if the data transmission start request C has been received in step S78, the flow shifts to step S80 to transmit a reception ready response D to the communication terminal device 1 on the transmission side. Subsequently, the CPU 2 determines whether or not the transmission data E transmitted from the communication terminal device 1 on the transmission side has been received (step S81). If the transmission data E has been received, the process proceeds to step S82 and the transmission is performed. The contents of the data E are received, and the flow shifts to step S83. If the transmission data E has not been received, the process proceeds to step S83 without performing the process of step S82.

In step S83, it is determined whether or not the transmission end notification F transmitted from the communication terminal device 1 on the transmitting side has been received. If the transmission end notification F has not been received, the process proceeds to step S84. In Step S84, Step S
At 81, it is determined whether or not a predetermined time or more has elapsed since it is determined whether or not the transmission data E has been received. Step S84
If it is determined that the predetermined time has not elapsed, the CPU 2 returns to step S81. If the predetermined time has elapsed, the CPU 2 proceeds to step S85.

In step S85, the CPU 2 generates table information for displaying and guiding that an error has occurred, outputs the table information to the display unit 10, and displays a screen for guiding the occurrence of the error on the display screen of the display unit 10. Is displayed, and the process ends. If the transmission end notification F is received in step S83, the CPU 2 ends the process.

In each of the processes shown in FIGS. 11 and 12, the time used as the reference for determination in steps S54, 62, 74 and 79, and the number of times used as the reference for determination in steps S55, 63 and 75 are: It is set in advance and stored in the storage device 4, but can be arbitrarily set and changed by an input operation on the input unit 9.

As described above, according to the second embodiment of the present invention, in addition to the effects obtained by the first embodiment, when the communication terminal device 1 is used as the transmitting side, If the communication terminal device is configured to determine the reception intensity when receiving the dummy data A transmitted from the communication terminal device 1 and transmit the determination intensity data G indicating the reception intensity,
The transmission intensity in the communication terminal device 1 can be adjusted to an appropriate value. When the communication terminal device 1 is the receiving side, the communication terminal device on the transmission side transmits the dummy data A to the communication terminal device 1 and transmits the dummy data A based on the discrimination strength data G transmitted from the communication terminal device 1. With the configuration having the function of adjusting the intensity, the same effect as described above can be obtained, and a communication system that adjusts the transmission intensity to an appropriate value at the time of transmitting and receiving a wireless signal can be easily constructed and provided.

Note that in the second embodiment,
After the transmission intensity is adjusted in step S59 of the transmission process (FIG. 11), the operation shifts to the operation of transmitting data as it is. However, the present invention is not limited to this. Thereafter, it is of course possible to transmit the dummy data A again to the communication terminal device 1 on the receiving side to determine and adjust the transmission intensity.

Further, in the second embodiment,
Although the wireless signal is transmitted and received between the communication terminal device 1 on the transmitting side and the communication terminal device 1 on the receiving side, the present invention is not limited to this. That is, as long as the receiving process shown in FIG. 12 can be executed, a device having a configuration different from that of the communication terminal device 1 can be used as the receiving communication terminal device.

Further, in the second embodiment,
A communication system for transmitting and receiving various data and a corresponding communication protocol can be arbitrarily configured, and other detailed configurations can also be arbitrarily changed.

[0134]

According to the communication terminal device according to the first aspect of the present invention and the storage medium according to the sixth aspect of the present invention, when a radio signal is transmitted / received to / from a predetermined communication device, the transmission is performed. Since the transmission intensity is adjusted according to the reception intensity of the reception of the wireless signal, the transmission intensity can be reduced, for example, when the communication environment is good. As a result, it is possible to save power consumption at the time of transmission without transmitting a radio signal with a transmission intensity higher than necessary, and to prevent a failure such as saturation of a reception amplifier due to too strong reception intensity. . Furthermore, for example, when the communication environment is poor and it is difficult to receive a radio signal, the transmission intensity can be increased. Therefore, more stable transmission and reception of the radio signal can be performed, and more reliable communication can be performed.

According to the communication terminal device of the second aspect of the present invention, before transmitting / receiving a radio signal, transmission / reception of a reception intensity determination radio signal is performed to determine the reception intensity. Even in the communication terminal device, the communication state is adjusted to a suitable communication state by adjusting the transmission intensity, and then various types of data are transmitted and received, so that the reliability of communication can be further improved.

According to the communication terminal device of the invention described in claim 3 and the storage medium of the invention described in claim 7, a predetermined communication device capable of transmitting information indicating reception strength at the time of reception as a communication device of a communication destination. When information indicating the reception intensity is received from the communication device, the transmission intensity is adjusted based on the information. This makes it possible to maintain a good reception state in the communication device of the communication destination, prevent a failure such as saturation of the reception amplifier, and perform more reliable communication.
Further, if the transmission intensity is reduced within a range where the reception intensity of the communication apparatus at the communication destination is good, power consumption during transmission can be saved while maintaining the necessary and sufficient transmission intensity.

According to the communication system of the fourth aspect and the storage medium of the eighth aspect, the communication terminal device on the receiving side transmits information indicating the reception intensity at the time of reception, and transmits the information. In the communication terminal device on the side, the transmission intensity is adjusted based on the information. For this reason, in the communication terminal device on the receiving side, it is possible to prevent a failure due to too strong reception intensity and to perform more reliable communication. In addition, the communication terminal device on the transmitting side does not transmit at a transmission intensity higher than necessary, so that power consumption during transmission can be saved.

According to the communication system of the fifth aspect of the present invention, in the communication terminal device on the receiving side, the reception strength is determined before transmitting / receiving another radio signal, and the transmission strength is determined in the communication terminal device on the transmitting side. After the adjustments are made,
Transmission and reception of various data are performed. Therefore, by transmitting and receiving various data after adjustment to a suitable communication state,
The reliability of communication can be further improved.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a communication terminal device 1 according to an embodiment of the present invention.

FIG. 2 is a block diagram showing an internal configuration of the wireless transmitting / receiving device 6 shown in FIG.

3A and 3B are diagrams illustrating an example of a signal waveform output from each unit in FIG. 2; FIG. 3A illustrates an example of a waveform of a received wireless signal output from a duplexer 63; FIG. 7 shows an example of a waveform of a reception amplifier output signal output from a demodulator 66, and FIG. 7C is a diagram showing an example of a waveform of a demodulator output signal output from a demodulator 66.

FIG. 4 is a block diagram showing an internal configuration of a reception strength detection section 67 shown in FIG.

5 is a diagram schematically showing a configuration of an intensity conversion table 4a stored in a storage device 4 shown in FIG.

6 is a general flow showing an operation at the time of communication in the communication terminal device 1 shown in FIG.

FIG. 7 is a flowchart showing the transmission processing shown in step S5 of FIG. 6 in more detail;

FIG. 8 is a flowchart showing the receiving process shown in step S6 of FIG. 6 in more detail;

FIG. 9 is a block diagram illustrating a configuration of a wireless transmission / reception device 60 according to a modification of the first embodiment of the present invention.

FIG. 10 is a circuit diagram showing in more detail a configuration of a main part of the wireless transmission / reception device 60 shown in FIG. 9;

FIG. 11 is a flowchart illustrating a transmission process executed by the communication terminal device 1 on the transmission side according to the second embodiment of the present invention.

FIG. 12 is a flowchart illustrating a reception process performed by the communication terminal device 1 on the reception side according to the second embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 communication terminal device 1 2 CPU 3 RAM 4 storage device 4a intensity conversion table 5 storage medium 6 wireless transmission / reception device 61 modulator 62 high frequency amplifier 63 duplexer 64 current adjustment unit 65 reception amplifier 66 demodulator 67 reception intensity detection unit 68 P / S Converter 71 Comparator array unit 81 Reference voltage supply circuit 601 Received intensity detection unit 602 Current adjustment unit 603 Reference voltage supply unit 604 Latch circuit C1 to Cn Comparator R11 to R1n, R21 to R2n, R3 Resistance TR1 to TRn Transistor 7 Antenna 8 Transmission control unit 9 Input unit 10 Display unit 11 Printing unit 12 Bus A Dummy data B Response data C Data transmission start request D Reception ready response E Transmission data F Transmission end notification G Discrimination intensity data H Intensity data

Claims (8)

[Claims] 1. A communication terminal device for transmitting and receiving a radio signal to and from a predetermined communication device, comprising: a reception intensity discriminator for judging a reception intensity when a radio signal transmitted from the communication device is received; A transmission intensity adjusting unit that adjusts a transmission intensity for transmitting its own wireless signal based on the reception intensity determined by the intensity determination unit; and a wireless signal to the communication device based on the transmission intensity adjusted by the transmission intensity adjustment unit. A communication terminal device comprising: a transmitting unit that transmits. 2. The method according to claim 1, wherein the receiving strength determination unit performs transmission / reception of a reception strength determination wireless signal to determine a reception strength before transmitting / receiving a wireless signal to / from the communication device. Item 2. The communication terminal device according to item 1. 3. A communication terminal device for transmitting / receiving a radio signal to / from a predetermined communication device, wherein when the information indicating the reception strength of the radio signal transmitted to the communication device is received from the communication device, the information is added to the information. And a transmission unit that transmits a wireless signal to the communication device based on the transmission intensity adjusted by the transmission intensity adjustment unit. A communication terminal device characterized by the above-mentioned. 4. A communication system for transmitting and receiving a radio signal between a plurality of communication terminal devices, wherein the communication terminal device on the reception side receives a radio signal transmitted from the communication terminal device on the transmission side. Receiving strength information transmitting means for transmitting information indicating the receiving strength determined by the receiving strength determining means to the communication terminal device on the transmitting side, and the communication on the transmitting side. The terminal device, when receiving from the communication terminal device of the receiving side information indicating the reception strength of the radio signal transmitted to the communication terminal device of the receiving side, based on the information, to the communication terminal device of the receiving side Transmission intensity adjusting means for adjusting the transmission intensity for transmitting a radio signal, and a transmitter for transmitting a radio signal to the communication terminal device on the receiving side based on the transmission intensity adjusted by the transmission intensity adjustment means. And a stage. 5. The reception strength determination means of the communication terminal device on the receiving side, when receiving a radio signal from the communication terminal device on the transmission side, determines the reception strength before transmitting / receiving another wireless signal. The communication system according to claim 4, wherein the communication is performed. 6. A storage medium storing a computer-executable program for transmitting / receiving a radio signal to / from a predetermined communication device, wherein the reception strength when the radio signal transmitted from the communication device is received is stored. A computer-executable program code for determining, and a computer-executable program code for adjusting a transmission intensity for transmitting its own wireless signal based on the determined reception intensity; and A storage medium storing a program including: a computer-executable program code for transmitting a wireless signal to the communication device according to transmission intensity. 7. A storage medium storing a computer-executable program for transmitting / receiving a wireless signal to / from a predetermined communication device, wherein information indicating the reception strength of the wireless signal transmitted to the communication device is stored in the communication medium. A computer-executable program code for adjusting a transmission intensity for transmitting a radio signal to the communication device based on the information when received from the device; and transmitting the radio signal based on the adjusted transmission intensity. A storage medium storing a program including: a computer-executable program code for transmitting to a device. 8. A storage medium storing a computer-executable program for controlling a communication system for transmitting and receiving radio signals between a plurality of communication terminal devices, wherein the communication terminal device on the reception side stores the program on the transmission side. A computer-executable program code for determining a reception strength when receiving a wireless signal transmitted from a communication terminal, and information indicating the determined reception strength is transmitted to the communication terminal on the transmitting side. Computer-executable program code for causing the communication terminal device on the transmission side to receive information indicating the reception strength of a radio signal transmitted to the communication terminal device on the reception side from the communication terminal device on the reception side Then, based on the information, a computer for adjusting the transmission intensity for transmitting a radio signal to the communication terminal device on the receiving side. A program code that can be executed by a data communication apparatus, and a program code that can be executed by a computer for transmitting a wireless signal to the communication terminal device on the receiving side with the adjusted transmission intensity. Storage medium.