JP2001167376A - Radio system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce unnecessary consumption of a battery as much as possible by shortening a period wherein the power source of a radio reception part is turned ON for carrier detection. SOLUTION: Radio devices on a transmission and a reception side are provided with a standard time radio wave receiving antenna 27 which receives a standard time radio wave giving notice of standard time, a standard time radio wave reception part 28 which demodulates the standard time radio wave received by the receiving antenna, and a main control part 30 which obtains the latest standard time information from the reception part and electronically correct the time of an internal timer part 26; and the radio device on the transmission side starts sending a message to the radio device on the reception side at reference time and the radio device on the reception device turns on the power source of a radio reception part 22 at reference time to perform carrier detection by a carrier sense part, receives the message by holding the radio reception part in the power-ON state when a carrier is detected, and turns off the power source of the radio reception part immediately if no carrier is detected within a time width Tw.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless system including a plurality of wireless devices that require low power consumption operation such as being driven by a battery.

[0002]

2. Description of the Related Art As a system to which this kind of radio system is applied, for example, there is a radio automatic meter reading system using a specified low power radio telemeter. As shown in FIG. 12, a wireless base unit 2 is connected to a gas meter 1 installed in a general house or building, and a meter reader carries the wireless base unit when the meter comes on a road near a place where the gas meter 1 is installed. 3 wirelessly transmits a response request signal to the wireless handset 2, and upon receiving the response request signal, the wireless handset 2 receives the current meter value from the gas meter 1 and wirelessly transmits the current meter value to the wireless base unit 3. This is a system in which a meter reader can automatically measure a gas meter 1 at a remote position.

The wireless slave unit 2 used in such a system is of a battery-driven type because it is installed outdoors where it is difficult to supply commercial power. And as seen in the microcomputer type safety device built in the gas meter these days, this type of device needs to be operated reliably without replacing the battery for about 10 years for maintenance convenience and reliability. There is.

For this reason, the wireless slave unit 2 controls the wireless receiving circuit to operate intermittently during standby and to shift to the continuous receiving operation only when it is recognized that the radio wave addressed to the own station has arrived. Power saving operation to extend battery life. As shown in FIG. 13, the transmission signal format of the specified low-power radio station is a bit synchronization signal, a frame synchronization signal, a legal call name, followed by a terminal ID (identification) signal for identifying a transmission partner terminal, and data. I have.

[0005] In order to perform the above-described power saving operation on the premise of receiving such a reception signal, the wireless slave device 2 is configured as shown in FIG.
As shown in FIG. 1, a wireless transmitting / receiving antenna 11 and a wireless receiving unit 12 and a wireless transmitting unit 13 connected to the antenna 11
A carrier sense unit 14 for detecting an intermediate frequency signal level of the wireless receiving unit 12 and comparing the detected level with a reference level; and a wireless intermittent receiving operation control unit 15 for controlling a power supply of the wireless receiving unit 12
And a main control unit 16 for controlling these units and processing transmission / reception data, and a battery 17 for supplying power to each unit.

[0006] As shown in FIG. 16, the wireless handset 2 having such a configuration starts an intermittent reception timer in S 1,
At, the end of the pause time during which the main power supply of the wireless reception unit 12 is turned off is checked.
At, the main power supply of the wireless receiving unit 12 is turned on, and at S4,
Starts a gate timer that measures the time that the main power is on.

Then, at S5, the carrier sense section 14
Checks whether a carrier has been detected. If no carrier has been detected, in S6, the time counted by the gate timer _TG
Is checked whether or not T _G ≧ T ₁ holds, and T _G ≧ T
If not set to ₁ to continue the carrier detection check, if turned T _G ≧ T _1, at S7, the main power of the radio receiver 12 to OFF, the flow returns to the start of the intermittent reception timer S1.

Further, when the carrier sense unit 14 before the _{T G} ≧ _{T 1} detects the carrier, followed by at S8,
It is checked whether or not the ID of its own terminal has been detected. If the ID has not been detected, the main power supply of the wireless receiving unit 12 is turned off in S7, and the process returns to the start of the intermittent reception timer in S1. Further, upon detecting the ID of the own station terminal, subsequently, in S9,
Perform data reception processing. When the data reception process is completed, the main power supply of the wireless reception unit 12 is turned off in S7, and the process returns to the start of the intermittent reception timer in S1.

By performing such an operation, the wireless slave unit 2
Means that the main power supply of the wireless receiving unit 12 is turned off during the time T2 and turned on during the time T1, as shown in FIG. Then, in the period of time T1, it is checked whether or not the detection signal is output from the carrier sense unit 14. If the detection signal is not output from the carrier sense unit 14 during this period, after the elapse of the time T1, Turn off the main power supply. During this period,
When the detection signal is output from the carrier sensing unit 14 as shown in (b) and (c) of FIG. 5, the wireless receiving unit 12
As shown in (a), the main power supply is kept ON and the receiving operation is continued, the terminal ID signal arriving after that is identified, and if it is the own station ID, the data is continuously received. Also,
If it is not the ID of the own station, the main power of the wireless receiving unit 12 is turned off.
To stop the receiving operation. On the other hand, the wireless master device 3 transmits a response request signal at an arbitrary time without having a temporal link with the wireless slave device 2.

[0010]

By the way, in recent years, for the purpose of effective use of frequency resources, "use integration" of frequencies has been promoted by the radio wave administration, and for example, is frequently used in restaurant order entry systems and the like. The specified low power data transmission radio station can also use the same frequency band as the specific low power radio telemeter. For this reason, in the conventional wireless system, the wireless handset 2 receives an irrelevant radio wave, the main power of the wireless receiving unit 12 is continuously turned on by the detection signal of the carrier sense unit 14, and the subsequent terminal ID signal mismatches. Recognize main power for the first time
The probability of performing the control of returning to the FF is increased, and as a result, there is a problem in that the wireless receiving unit 12 continues to operate even after the time T1 has been wasted, and the battery 17 is consumed quickly. .

Therefore, the inventions according to the first to fourth aspects of the present invention provide a method for intermittently performing carrier sense by adopting the same reference time for both the wireless device on the receiving side and the wireless device on the transmitting side. And a wireless system capable of reducing waste of battery power as much as possible.

[0012]

According to the first aspect of the present invention,
The wireless device serving as a receiving side includes a plurality of wireless devices, a first clock unit capable of time calibration, and a first reference time radio wave receiving unit receiving a reference time radio wave and acquiring reference time information. A first intermittent reception operation control means for intermittently operating the first reference time radio wave receiving means, and a first intermittent reception operation control means based on the reference time information received and acquired by the first reference time radio wave reception means.
First clock calibration means for calibrating the clock means, carrier sense means for detecting the presence or absence of a radio reception wave, and carrier sense means for periodically defining the carrier sense means based on the time measured by the first clock means. Second intermittent reception operation control means for enabling only the reception, and main control means for controlling when the carrier sense means has performed carrier detection within a prescribed gate time width, to perform an operation of receiving a subsequently arriving radio reception wave. And a battery that supplies power to each unit. The transmitting-side wireless device includes a second clock unit capable of calibrating time and a second clock unit that receives reference time radio waves and acquires reference time information. Reference time radio wave receiving means, second clock calibrating means for calibrating the second clock means based on the reference time information received and acquired by the second reference time radio wave receiving means, and clocking by the second clock means Time in that a radio transmission means for initiating a radio transmission between a defined gate time width as a reference.

According to a second aspect of the present invention, in the wireless system according to the first aspect, the reference time radio waves received by the first and second reference time radio wave receiving means report the standard time by radio waves from a standard radio wave transmitting facility. The standard time radio wave transmitted for this purpose. According to a third aspect of the present invention, in the wireless system according to the first aspect, the reference time radio waves received by the first and second reference time radio wave receiving means are transmitted from a standard radio wave transmitting facility to report the standard time by radio waves. The standard time radio wave is relayed and the radio wave is retransmitted at the same frequency or a different frequency. According to a fourth aspect of the present invention, in the wireless system according to the first aspect, the reference time radio waves received by the first and second reference time radio wave receiving means are transmitted between the radio apparatus on the receiving side and the radio apparatus on the transmitting side. The radio wave is used for reporting the same time information to both.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings. This wireless system includes, for example, two wireless devices. These wireless devices are, as shown in FIG. 1, a wireless transmitting / receiving antenna 21 used for wireless communication by radio waves with a partner wireless device. A wireless receiving unit 22 and a wireless transmitting unit 23 are connected.

The carrier sense unit 24 compares the level of the intermediate frequency signal from the radio receiving unit 22 with the reference level, and outputs a carrier detection signal when the intermediate frequency signal level exceeds the reference level. Wireless receiver 2
2, a wireless intermittent receiving operation control unit 25 for controlling the main power supply of the wireless receiving unit 22 to perform an intermittent receiving operation; an internal clock unit 26 capable of electronically calibrating the time; A standard time radio wave receiving antenna 27 for receiving a standard time radio wave for reporting standard time in a long wave band at a frequency of 40 kHz from a standard radio wave transmitting facility managed and operated by the Ministry, and a standard time radio wave receiving demodulating the standard time radio wave received by the receiving antenna 27. Unit 28, a standard time radio wave intermittent reception operation control unit 29 which controls the power supply of the standard time radio wave reception unit 28 and causes the standard time radio wave reception unit 28 to perform an intermittent reception operation;
Main control unit 3 that controls each unit and processes wireless transmission / reception data
0 and a battery 31 as a battery for supplying power to each unit
It has. The standard time radio wave receiving antenna 2
As 7, for example, a high-sensitivity ferrite bar antenna used for a medium-wave band radio or the like is used.

The standard time radio wave from the standard radio wave transmitting facility transmits date and time information repeatedly in a pattern shown in FIG. 4 for 24 hours. One minute transmission is performed for one minute based on a cesium beam type atomic frequency standard. The unit contains extremely accurate information of seconds, minutes, hours, and days (total days from January 1). The start of the emission of the radio wave at the point indicated by the reference marker in the figure coincides with the second.

The configuration of FIG. 1 is the same for the wireless device on the receiving side and the wireless device on the transmitting side.
Forms the first clock means in the wireless device on the receiving side,
The wireless device on the transmitting side forms second clock means. The standard time radio wave receiving unit 28 forms first reference time radio wave receiving means in a wireless device on the receiving side, and forms second reference time radio wave receiving means in a wireless device on the transmitting side.

The standard time radio wave intermittent reception operation control section 29 forms a first intermittent reception operation control means in the wireless device on the receiving side. The wireless intermittent reception operation control unit 25 forms a second intermittent reception operation control unit in a wireless device on the receiving side.

In both the radio apparatus on the receiving side and the radio apparatus on the transmitting side, the standard time radio wave receiving unit 28 intermittently receives the standard time radio wave captured by the standard time radio wave receiving antenna 27 and outputs the demodulated output. It is supplied to the main control unit 30. The intermittent reception in the standard time radio wave receiving unit 28 is controlled by the standard time radio wave intermittent reception operation control unit 29, and is performed at a low frequency of, for example, three times a day for two minutes each.

As a result, the power consumption required to obtain the standard time is extremely low, and the effect on the life of the battery 31 is extremely small. The main control unit 30, which has obtained the latest standard time information from the standard time radio wave receiving unit 28, electronically calibrates the time of the internal clock unit 26 each time.

In the wireless device on the receiving side, the main control unit 30 monitors the time measured by the internal clock unit 26, and
As shown, the reference time period _{T C} set in advance by the software, for example, 3 o'clock 11 minutes 10 seconds, 3 o'clock 12 minutes 10
Sec, at time or three o'clock 13 minutes 10 seconds, and outputs a control signal to turn ON the power of the radio receiver 22 only during the time width T _W to the radio intermittent receiving operation control unit 25. Time width T _W is, for example, it is set to a very short time width such as 5 msec. As a result, the power consumed by the wireless receiving unit 22 can be suppressed low, and the battery 3
1 can be kept low.

In the wireless device on the transmitting side, the main control unit 30 monitors the time measured by the internal clock unit 26, and when a transmitting operation is performed, the main controlling unit 30 sets in advance by software similarly to the receiving side. reference time and the period T _C, for example, 3 o'clock 11 minutes 10 seconds, 12 minutes and 10 seconds at 3, at time or three o'clock 13 minutes 10 seconds, as shown in FIG. 3, time set in advance by the software After a delay of _Td, the power of the wireless reception unit 22 is turned on to start transmission.

The relationship between the time width T _W and time T _d, as shown in FIG. 3, but the effective start time of the radio transmission is to enter the time the width T _W by the delay time T _d, carrier sense unit 24 of the receiving side to become the wireless device in consideration of the electrical time constant, etc. to the output of the comparison of the reference voltage to detect the carrier 0.1T _W ≦ T _d ≦ 0.6T _W about Is desirable.

[0024] Thus, since setting a reference time by the wireless device also same standard time radio wave becomes a reception side radio apparatus comprising a transmission side and timed in a narrow gate time width T _W of the receiving side Transmission can begin.

FIG. 7 is a flowchart showing the operation of the main part of the radio apparatus on the transmitting side. First, in step S11, the standard time radio wave receiving unit 28 intermittently operates to receive the standard time radio wave, and mainly converts the demodulated signal. It is supplied to the control unit 30. The main control unit 30 acquires the current time from the demodulated signal, and in S12, the internal clock unit 26
Calibration.

Subsequently, when it is checked in S13 that a transmission operation is being performed, in S14, the carrier sense unit 24 performs carrier sense and confirms that communication with other stations is not hindered. , S15, the wireless receiving unit 22
Wait for a reference time to turn on the power of the device. When the reference time arrives, in S16, after a delay of the time _Td from that time, in S17, the transmission of a message addressed to the wireless device on the receiving side is started.

FIG. 8 is a flow chart showing the operation of the main part of the radio apparatus on the receiving side. First, in step S21, the standard time radio wave receiving unit 28 intermittently operates to receive the standard time radio wave, and mainly converts the demodulated signal. It is supplied to the control unit 30. The main control unit 30 acquires the current time from the demodulated signal, and in S22, the internal clock unit 26
Is calibrated, and in step S23, the power of the wireless receiving unit 22 is turned off.
Wait for the reference time to reach N.

[0028] Then, the reference time arrives, at S24, to start the intermittent reception timer, at S25, the power of the radio receiver 22 to ON at S26, the time _{T W,} which has a power ON Start the gate timer to be timed.

In this state, at S27, carrier sense is performed.
It is checked whether the unit 24 has detected the carrier, and the carrier is detected.
If there is no rear detection, the timer of the gate timer is counted in S28.
Time T_GIs the specified gate time width T_WFor T_G≧ T
_WCheck whether or not T_G≧ T_WHas become
If not, the carrier detection check is continued and T_G≧ T _W
If so, in S29, the power of the wireless receiving unit 22 is turned off.
It turns off and returns to the start of the intermittent reception timer in S24.

If the carrier sensing unit 24 detects a carrier before T _G ≧ T _W , the receiving operation is continued at S30 and the message is received. When the receiving process of the message is completed, the process returns to S29. , Turn off the power of the wireless receiving unit 22,
The process returns to the start of the intermittent reception timer in S24.

In such a configuration, the wireless device on the receiving side starts the intermittent receiving timer when the reference time comes and turns on the power of the wireless receiving unit 22. And FIG.
As shown in, the carrier sense unit 24 turns OFF the power of the time T _W Without carrier sense elapses radio receiver 22 to define the gate time within the width T _W. Also,
As shown in FIG. 6, when the carrier sense unit 24 performs the carrier sensing in the specified gate time width T _W, the radio receiver 2
2, the receiving operation is continued by continuing the power ON state, and the electronic message is received.

As described above, both the wireless device on the receiving side and the wireless device on the transmitting side intermittently receive the standard time radio wave transmitted from the standard radio wave transmitting facility three times a day and adjust the time of the internal clock unit 26. Since the calibration is performed, the times measured by the internal clock units 26 of both wireless devices are exactly the same.

When the time measured by the internal clock unit 26 reaches the reference time, the wireless device on the transmitting side starts transmitting a message to the receiving side after a delay of time _Td . on the other hand,
If the receiving wireless device the time the internal clock section 26 counts equal to the reference time, the power of the radio receiver 22 and to ON, performs carrier detection operation by the carrier sense unit 24 by the specified gate time width T _W, during which , And receives a message from the wireless device on the transmission side.

As described above, the internal clock units 26 of both wireless devices
Are exactly the same by calibrating the time with the standard time radio wave transmitted from the standard radio wave transmitting facility, so that the reference times of both wireless devices are exactly the same. Therefore, even if a short prescribed gate time width _{T W} to turn ON the power of the radio receiver 22 in a wireless device that is a receiving side, if the satisfied 0.1T _W ≦ _{T d} ≦ 0.6T _W relation, The message transmitted after the wireless device on the transmitting side is delayed by the time _Td is reliably received by the wireless receiving unit 22 of the wireless device on the receiving side.

[0035] Thus, since it sufficiently shortened defined gate time width T _W of the power of the radio receiver 22 to ON in the wireless device that is a receiving side can be reduced consumption of the battery 31.

In addition, irrelevant radio waves rarely arrive during the period when the power of the radio receiver 22 is turned on, and wasteful reception of irrelevant radio waves is extremely reduced.
Therefore, the wireless device on the receiving side can perform carrier detection without performing ID detection, and can immediately start receiving a message upon performing carrier detection. Further, the power immediately radio receiver 22 after a time T _W passed if there is no carrier can be detected to OFF. Therefore, also from this point, the time during which the power of the wireless reception unit 22 is turned on can be shortened, and the battery 31
Consumption can be reduced.

As described above, wasteful reception of extraneous radio waves is extremely reduced, and wasteful consumption of the battery 31 can be reduced as much as possible. In the above-described embodiment, the case where the standard time radio wave from the standard radio wave transmitting facility is directly received by the standard time radio wave receiving antenna 27 and supplied to the standard time radio wave receiving unit 28 has been described as an example. Not something.

As shown in FIG. 9, for example, when an external radio wave cannot be directly received by the standard time radio wave receiving antenna 27, as in an underground shopping mall, the partition 4
Another standard time radio wave receiving antenna 42 is disposed outside the standard time radio wave receiving antenna 42, the standard time radio wave receiving antenna 42 receives a standard time radio wave of 40 kHz from a standard radio wave transmitting facility, and the received signal is transmitted through a cable 43 to the partition wall 41. The signal is fetched inside, the received signal is amplified by the amplifier 44, and then transmitted at the same frequency by the retransmission antenna 45. The signal is received by both the wireless device on the transmitting side and the wireless device on the receiving side, and the internal clock unit May be calibrated. In this way, the wireless system can be used effectively even in a place where the external standard time radio wave does not reach or where the external standard time radio wave does not easily reach. In this case, it is needless to say that the same operation and effect as those of the above-described embodiment can be obtained.

In an environment where there is no partition but the reception level of the standard time radio wave is low, as shown in FIG. An antenna 51 receives a standard time radio wave of 40 kHz from a standard radio wave transmitting facility, supplies the received signal to an amplifier 53 via a cable 52, amplifies the signal, and amplifies the amplified received signal by a local oscillator 55 in a frequency converter 54. For example, a local oscillation signal of 85 kHz is mixed and frequency-converted, and only a 125 kHz component is extracted through a band-pass filter 56. This is again amplified by an amplifier 57, and
The internal clock section may be calibrated by transmitting a 5 kHz retransmission standard time radio wave and causing the radio wave to be received by both the wireless device on the transmitting side and the wireless device on the receiving side. In this case, the isolation between the input and the output is high, and abnormal oscillation hardly occurs. Further, the wireless system can be effectively used even in a place where the external standard time radio wave does not reach or where the external standard time radio wave does not easily reach. In this case, it is needless to say that the same operation and effect as those of the above-described embodiment can be obtained.

When installed in a place where an external standard time radio wave cannot be used, such as an underground shopping mall, a unique reference time radio wave is generated. For example, as shown in FIG. 11, an oscillator 61 having an oscillation frequency of 125 kHz is provided,
The oscillation signal from the oscillator 61 is supplied to the modulation section 62 as a carrier signal. On the other hand, the control unit 64 is connected to the telephone line 63, and the control unit 64 periodically dials up the time information of Nippon Telegraph and Telephone Corporation via the telephone line 63, and obtains the tone signal and the like of the voice region obtained therefrom. The time information based on the pulse signal is converted into an electrical timing signal, for example, 0V.
And a 5V digital signal, and the time of the clock unit 65 is electronically calibrated by the digital signal.

The control unit 64 supplies the time information measured by the clock unit 65 to the modulation unit 62 as a modulation signal. The modulation section 62 performs pulse width modulation on the carrier signal from the oscillator 61 with a modulation signal from the control section 64, amplifies this with an amplifier 66, and
The internal clock section may be calibrated by transmitting a 5 kHz retransmission reference time radio wave and causing the radio wave to be received by both the radio device on the transmitting side and the radio device on the receiving side.

In this manner, the wireless system can be used effectively even in a place where the external standard time radio wave cannot be used. In this case, it is needless to say that the same operation and effect as those of the above-described embodiment can be obtained.

[0043]

According to the present invention, carrier sensing is performed intermittently by adopting the same reference time for both the wireless device on the receiving side and the wireless device on the transmitting side. Can be shortened, wasteful reception of extraneous radio waves can be extremely reduced, and wasteful battery consumption can be reduced as much as possible. According to the third aspect of the present invention, the wireless system can be effectively used even in a place where an external standard time radio wave does not reach or is difficult to reach, such as an underground mall. According to the fourth aspect of the present invention, the wireless system can be effectively used even in a place where an external standard time radio wave cannot be used.

[Brief description of the drawings]

FIG. 1 is a block diagram of a wireless device on a receiving side and a transmitting side showing an embodiment of the present invention.

FIG. 2 is a diagram showing power control timing of the wireless reception unit by the wireless intermittent reception operation control unit according to the embodiment;

FIG. 3 is a diagram showing a power control timing of a wireless receiving unit at the time of transmitting a message in a wireless device on the transmitting side according to the embodiment;

FIG. 4 is a view showing a pattern of a standard time radio wave used in the embodiment.

FIG. 5 is a diagram for explaining power control of the wireless reception unit when the carrier is not detected in the wireless device on the receiving side according to the embodiment;

FIG. 6 is an exemplary view for explaining power control of the wireless receiving unit when the carrier of the wireless device on the receiving side is detected in the embodiment.

FIG. 7 is a flowchart showing an operation of a main part of the wireless device on the transmitting side according to the embodiment;

FIG. 8 is a flowchart showing an operation of a main part of the wireless device on the receiving side according to the embodiment;

FIG. 9 is a diagram showing another reception form of the standard time radio wave.

FIG. 10 is a diagram showing another reception form of the standard time radio wave.

FIG. 11 is a diagram showing a reception mode of a reference time radio wave.

FIG. 12 is a block diagram showing a conventional example.

FIG. 13 is a diagram showing an example of a transmission signal format of a specific low power radio station.

FIG. 14 is a block diagram showing a configuration of a wireless slave device in the conventional example.

FIG. 15 is a view for explaining power control of the wireless reception unit when the carrier is not detected and when the carrier is detected in the wireless slave device in the conventional example.

FIG. 16 is a flowchart showing the operation of the main part of the wireless slave device in the conventional example.

[Explanation of symbols]

 Reference Signs List 22 wireless receiving unit 23 wireless transmitting unit 24 carrier sense unit 25 wireless intermittent receiving operation control unit 26 internal clock unit 27 standard time radio wave receiving antenna 28 standard time radio wave receiving unit 29 standard time radio wave intermittent receiving operation Control unit 30: Main control unit 31: Battery

Claims (4)

[Claims] 1. A wireless device comprising a plurality of wireless devices, a wireless device serving as a receiving side, a first clock means capable of calibrating time, and a first reference device for receiving reference time radio waves and acquiring reference time information. Time radio wave receiving means, first intermittent reception operation control means for intermittently operating the first reference time radio wave receiving means, and the first time based on reference time information received and acquired by the first reference time radio wave receiving means. First clock calibration means for calibrating the clock means, carrier sense means for detecting the presence or absence of a radio reception wave, and a gate for defining the carrier sense means periodically based on the time measured by the first clock means. A second intermittent reception operation control means for validating only for a time width, and an operation for receiving a subsequently arriving radio reception wave when the carrier sense means performs carrier detection in a specified gate time width. Control means, and a battery for supplying power to each unit. The transmitting-side wireless device includes a second clock means capable of calibrating the time, and a reference time information A second reference time radio wave receiving means for acquiring the second time reference signal, a second time calibration means for calibrating the second clock means with the reference time information received and acquired by the second reference time radio wave reception means,
Wireless communication means for starting wireless transmission during the prescribed gate time width with reference to the time measured by the second clock means. 2. The reference time radio wave received by the first and second reference time radio wave receiving means is a standard time radio wave transmitted from a standard radio wave transmitting facility to report standard time by radio wave. The wireless system according to claim 1. 3. The reference time radio wave received by the first and second reference time radio wave receiving means is relayed by the standard time radio wave transmitted from the standard radio wave transmitting facility to report the standard time by radio wave, and is transmitted at the same frequency or The radio system according to claim 1, wherein the radio wave is a radio wave retransmitted at a different frequency. 4. The reference time radio wave received by the first and second reference time radio wave receiving means is a radio wave for reporting the same time information to both the wireless device on the receiving side and the wireless device on the transmitting side. The wireless system according to claim 1, wherein