JP4535848B2 - Wireless transmission device and transmission channel setting method thereof, wireless transmission / reception system including the wireless transmission device, and transmission / reception channel setting method thereof - Google Patents

Description

  The present invention relates to a radio transmission apparatus and a transmission channel setting method used in a communication system in which a frequency group including a plurality of frequency channels is set, and a radio transmission / reception system including the radio transmission apparatus and setting of the transmission / reception channel The method is particularly suitable for use in a telecontrol device or telemeter device for industrial equipment using a specific low-power radio equipment.

2. Description of the Related Art Conventionally, a wireless communication system that performs communication by selecting one frequency channel within a frequency group including a plurality of frequency channels is known. In such a wireless system, in order to prevent interference with other devices, a “carrier sense” function for checking beforehand whether a frequency channel to be used is free or a “call name” unique to the transmission start is transmitted. May be required by law.
As an example, there is continuous communication using a one-way communication method or simplex method using 10 mW specified low-power telemeters in the 429 MHz band, telecontrol, and data transmission wireless standards. Standards established by the Japan Radio Industry Association It is known as “ARIB STD-T67”.

In this standard, 40 waves are assigned at intervals of 12.5 kHz from 429.2500 MHz to 429.7375 MHz as frequency channels that can be used in this wireless transmission system.
When the power is turned on or after communication is interrupted due to jamming radio waves or the like, it is mandatory to carry out the above-described carrier sense before starting transmission of transmission data.
As an example of adopting such a wireless transmission method, one side is in a receiving state while one is transmitting, and bidirectional communication is possible by a so-called simplex method that repeats transmission and reception alternately (hereinafter referred to as a bidirectional simplex method). A radio transmission / reception apparatus for telecontrol will be described below.

First, the radio transceiver for telecontrol is divided into a communication unit mounted on the control device side such as a crane and an operation unit that remotely controls the movement of the control device wirelessly from a location away from the control device. Can be transmitted and received between the operation units.
Specifically, although not shown, the operation unit is provided with various switches, levers, etc., and an operation signal is transmitted by the operator operating these switches, and this operation signal is received by the communication unit. The operator can operate the control device by transmitting an operation signal to the control unit of the control device and controlling the movement of the control device.
The communication unit receives a signal from the control unit of the control device, for example, the operation state (including operation completion and operation abnormality) of the control device, and transmits it to the operation unit, or receives the abnormality or the operation signal. A response to what has been done.
In addition, the operation unit and the communication unit also have a function of performing carrier sensing on the currently used frequency channel (or the currently available frequency channel).

Next, a specific communication operation will be described with reference to the flowcharts of FIGS.
In the communication unit and the operation unit, for convenience, the side that first transmits radio waves is the calling side, while the side that is initially receiving radio waves is the called side. The call side and operation unit will be described as the called side. Of course, communication is possible even if both sides are reversed.
First, as shown in FIG. 7, the communication unit first turns on the power (step S1). Then, the frequency channel used for the previous communication (the frequency channel set as the initial value at the time of factory shipment) is called from the storage device and set as a candidate for the transmission / reception frequency channel (step S2). Sense (step S3) and determine whether the set frequency is an empty frequency channel (step S4).
In addition, if the frequency channel to be used is not available, a predetermined rule (such as switching the frequency channel of the 40 waves to the next channel in order or switching by skipping every other one to several) To move the channel (step S11) and return to carrier sense.

If the frequency channel is free, the transmission / reception frequency channel is set, the transmission signal shown in FIG. 9 is transmitted (step S5), and then the “call reception mode” (step 6) is waited for the signal from the called side. )to go into. The transmission signal specifies the preamble, frame synchronization, identification signal (which identifies whether the signal at the time of call or the signal at the time of call, or the state of normal communication), the frequency channel data currently being transmitted, and self. ID and error detection code (CRC).
Next, if a received signal is detected, the ID and the like are collated, and it is determined whether the signal is from the operation unit of the own station paired with itself (step S7). Normal communication for transmitting and receiving a control signal is started (step S8). Otherwise, the process proceeds to step S11, and the channel is moved.
During communication, the reception state is always determined (step S9), and when reception is interrupted, carrier sense is performed again (step S3), and the frequency channel for transmission and reception is changed.

On the other hand, as shown in FIG. 8, the called-side operation unit, after turning on the power (step S21), calls the frequency channel used last time (step S22), like the communication unit, and this frequency. The channel is set as a transmission / reception frequency channel candidate, and carrier sense is performed (step S23). If there is a carrier, reception is started (step S25). If there is no carrier, the frequency channel is moved (step S30), and carrier sensing is performed again (step S23). In addition, when moving a frequency channel, it moves according to the same rule as the communication unit on the calling side.
Next, when there is a received signal, it is determined whether it is a communication unit of its own station (step S26). If it is a received signal from a pair, normal communication is started with the candidate frequency channel as a transmission / reception frequency channel. If the received signal is different from the received signal, the frequency channel is moved (step S30), and carrier sense is performed again (step S23).
Further, it is determined whether or not the reception signal is interrupted even during the communication. If it is not interrupted, the communication is continued as it is (step S29), and if it is interrupted, the carrier sense is performed again (step S23).
In this way, communication is performed between the communication unit and the operation unit while confirming the reception state.

By the way, when both the communication unit and the operation unit establish communication, or when communication is interrupted and communication is established again and communication is to be resumed, how quickly an available frequency channel is searched, and In the call side (operation unit), it is important to quickly find out what frequency channel the caller is using in order to speed up the response at the start of communication or when communication is resumed.
For this reason, as in the examples of FIGS. 7 and 8, at the start of communication, the frequency channel that has been successfully communicated is generally used first. When communication is resumed, it is known that the called party (communication unit) and calling party (operation unit) change the frequency channel according to certain rules (for example, every other unit) based on the frequency channel used last time. It has been.
Furthermore, as described in Japanese Patent Laid-Open No. 2001-36490, a specific frequency channel is not only detected and a transmission / reception frequency channel is set to an empty frequency channel, but also the frequency channel with the best condition is transmitted / received. It is described that it is set to the channel.

By the way, in the telecontrol device as described above, when communication must be established, for example, in an in-vehicle crane, (a) when the power is turned on, (b) when there is an interference radio wave and communication is interrupted, (C) When the operation unit is not operated for a certain period of time, there is a case where the “power saving mode” in which no radio wave is emitted is terminated and the normal communication state is restored.
Of the above (a) to (c), in the case of (a), communication can be established at the preparatory stage of work if it is before work. However, the power may be turned off between work. In (b) and (c), it can always occur even during normal work.
Here, when trying to establish communication using the frequency channel that was used last time, especially in (c), the time to enter the power saving mode varies depending on the device, but it is a short time such as several seconds to several minutes. Since there is a high probability that the frequency channel that has been used can be used, first, using the frequency channel that was previously used as the frequency channel for communication can shorten the time until communication is established as a result.
However, if communication cannot be established, it is unclear which frequency channel is free, so the calling side must sequentially search for free frequency channels from among the 40 frequency channels. . In addition, the called party must sequentially find out which frequency channel the calling party is calling. Therefore, it may take time until communication is established.

On the other hand, in the invention described in Japanese Patent Laid-Open No. 2001-36490, a frequency channel having the best condition for communication is set at the start of communication, and thus is often performed at the same place during a series of operations. In addition, since the state of radio waves such as noise does not change greatly if the place is the same, the possibility of receiving the jamming radio wave of (b) is reduced. However, as in the previous example, when communication cannot be established, it is necessary to sequentially search for a connectable frequency channel from among 40 frequency channels, and time is required until communication is established. There was a problem that it might take.
In addition, some frequency channels are grouped to reduce the number of channels to shorten the time until communication can be established. However, the number of channels that can be used is reduced, and how the channels are grouped. There is a problem that it is difficult to judge whether it is good.
JP 2001-36490 A

  The present invention has been made to solve the above-described problems, and can quickly return to the communication state when the power is turned on or when jamming from other stations, when returning from the “power saving mode”, etc. It is an object of the present invention to provide a wireless transmission device, a transmission channel setting method thereof, a wireless transmission / reception system including the wireless transmission device, and a transmission / reception channel setting method thereof.

First, the wireless transmission device according to claim 1 is a wireless transmission device that performs transmission by setting a predetermined empty channel as a transmission channel from a plurality of frequency channels,
Carrier sense for detecting a vacant channel from the plurality of frequency channels, and first storage means for storing, as carrier information, a frequency channel in which a carrier is detected by the carrier sense and a channel interval value;
Based on the carrier information stored in the first storage means, a clear channel calculation unit for calculating a clear channel in which no carrier is detected in a certain interval in an adjacent section; the clear channel and one or more known frequency channels; Second storage means for storing
An attempt is made to establish communication using the known frequency channel stored in the second storage means, and if communication is established, the known frequency channel is set as a transmission channel as it is, and the clear channel is newly set. A transmission channel allocating means for setting a candidate known frequency channel;
Communication means capable of transmitting required transmission data through the transmission channel when a predetermined transmission channel is set,
Channel data indicating the known frequency channel and the clear channel is transmitted to a wireless reception device at the start of communication or when communication is established to resume communication .

The wireless transmission device according to claim 2 is a wireless transmission device that performs transmission by setting a predetermined empty channel as a transmission channel from a plurality of frequency channels,
Carrier sense for detecting a vacant channel from the plurality of frequency channels, and first storage means for storing, as carrier information, a frequency channel in which a carrier is detected by the carrier sense and a channel interval value;
Based on the carrier information stored in the first storage means, a clear channel calculation unit for calculating a clear channel in which no carrier is detected in a certain interval in an adjacent section; the clear channel and one or more known frequency channels; Second storage means for storing
An attempt is made to establish communication using the known frequency channel stored in the second storage means, and if the communication cannot be established, the next candidate including the clear channel is changed to the known frequency channel for which communication could not be established. A transmission channel allocating means for setting a transmission channel by raising a known frequency channel;
Communication means capable of transmitting required transmission data through the transmission channel when a predetermined transmission channel is set,
Channel data indicating the known frequency channel and the clear channel is transmitted to a wireless reception device at the start of communication or when communication is established to resume communication .

Furthermore, the wireless transmission device according to claim 3 is a wireless transmission device that performs transmission by setting a predetermined empty channel as a transmission channel from a plurality of frequency channels,
Carrier sense for detecting a vacant channel from the plurality of frequency channels, and first storage means for storing, as carrier information, a frequency channel in which a carrier is detected by the carrier sense and a channel interval value;
Based on the carrier information stored in the first storage means, a clear channel calculation unit for calculating a clear channel in which no carrier is detected in a certain interval in an adjacent section; the clear channel and one or more known frequency channels; Second storage means for storing
Attempt to establish communication using the known frequency channel stored in the second storage means, and if communication can be established, the known frequency channel is set as a transmission channel as it is, whereas if communication cannot be established A transmission channel assigning means for setting the transmission channel by raising the next candidate known frequency channel instead of the known frequency channel for which communication could not be established, and setting the clear channel as the next candidate known frequency channel;
Communication means capable of transmitting required transmission data through the transmission channel when a predetermined transmission channel is set,
Channel data indicating the known frequency channel and the clear channel is transmitted to a wireless reception device at the start of communication or when communication is established to resume communication .

According to a fourth aspect of the present invention, in the wireless transmission device according to the first, second, or third aspect, the clear channel calculation unit clears the clear channel at the start of communication when power is turned on and when communication cannot be established. And the clear channel calculated for the second storage means is newly set or the already set clear channel is updated.

The wireless transmission / reception system according to claim 5 is a wireless transmission / reception system that performs transmission / reception between a wireless transmission device and a wireless reception device by setting a predetermined vacant channel as a transmission channel and / or a reception channel from a plurality of frequency channels. ,
A carrier sense for detecting a vacant channel from the plurality of frequency channels; a first storage means for storing a frequency channel in which a carrier is detected by the carrier sense and a channel interval value as carrier information; Based on the carrier information stored in the first storage means, a clear channel calculation unit for calculating a clear channel in which no carrier is detected in a certain interval or more in an adjacent section, and the clear channel and one or more known frequency channels An attempt is made to establish communication using the second storage means for storing and the known frequency channel stored in the second storage means, and when the communication is established, the known frequency channel is set as a transmission channel as it is. In addition, the clear channel is newly set as the next candidate for the transmission channel. It includes a signal channel allocation means, when a predetermined transmission channel is set, and communication means capable of transmitting the required transmission data by the transmission channel,
At the start of communication or when establishing communication to resume communication, the wireless transmission device transmits channel data indicating the known frequency channel and the clear channel to the wireless reception device,
The wireless reception device stores the channel data, and sets a known frequency channel as a reception channel based on the channel data, and a transmission channel assignment for newly setting the clear channel as a next known known frequency channel Means,
A carrier sense for detecting whether or not the frequency channel can be used, and a communication means capable of receiving transmission data transmitted from the wireless transmission device through the reception channel when a predetermined reception channel is set. It is characterized by having.

The wireless transmission / reception system according to claim 6 is a wireless transmission / reception system that performs transmission / reception between a wireless transmission device and a wireless reception device by setting a predetermined vacant channel as a transmission channel and / or a reception channel from a plurality of frequency channels. ,
A carrier sense for detecting a vacant channel from the plurality of frequency channels; a first storage means for storing a frequency channel in which a carrier is detected by the carrier sense and a channel interval value as carrier information; Based on the carrier information stored in the first storage means, a clear channel calculation unit for calculating a clear channel in which no carrier is detected in a certain interval or more in an adjacent section, and the clear channel and one or more known frequency channels Attempts to establish communication using the second storage means for storing and the known frequency channel stored in the second storage means, and if communication cannot be established, the communication is changed to the known frequency channel for which communication could not be established. The known frequency channel including the clear channel is moved up and set as the transmission channel. A transmission channel allocation unit that, when a predetermined transmission channel is set, and communication means capable of transmitting the required transmission data by the transmission channel,
At the start of communication or when establishing communication to resume communication, the wireless transmission device transmits channel data indicating the known frequency channel and the clear channel to the wireless reception device,
The wireless reception device sets the known frequency channel as the receiving channel based on the channel means and the storage means for storing the channel data, but communication cannot be established when communication cannot be established on the known frequency channel. A transmission channel allocating means for setting a transmission channel by raising a known frequency channel of a next candidate including the clear channel instead of the known frequency channel;
A carrier sense for detecting whether or not the frequency channel can be used, and a communication means capable of receiving transmission data transmitted from the wireless transmission device through the reception channel when a predetermined reception channel is set. It is characterized by having.

The wireless transmission / reception system according to claim 7 is a wireless transmission / reception system that performs transmission / reception between a wireless transmission device and a wireless reception device by setting a predetermined empty channel from a plurality of frequency channels as a transmission channel and / or a reception channel. ,
A carrier sense for detecting a vacant channel from the plurality of frequency channels; a first storage means for storing a frequency channel in which a carrier is detected by the carrier sense and a channel interval value as carrier information; Based on the carrier information stored in the first storage means, a clear channel calculation unit for calculating a clear channel in which no carrier is detected in a certain interval or more in an adjacent section, and the clear channel and one or more known frequency channels An attempt is made to establish communication using the second storage means for storing and the known frequency channel stored in the second storage means, and when the communication is established, the known frequency channel is set as a transmission channel as it is. On the other hand, if communication cannot be established, the known frequency channel for which communication could not be established. A transmission channel allocating means for setting up the next candidate known frequency channel as a transmission channel, and a communication means capable of transmitting required transmission data through the transmission channel when a predetermined transmission channel is set And
At the start of communication or when establishing communication to resume communication, the wireless transmission device transmits channel data indicating the known frequency channel and the clear channel to the wireless reception device,
The wireless reception device sets the known frequency channel as the receiving channel based on the channel means and the storage means for storing the channel data, but communication cannot be established when communication cannot be established on the known frequency channel. A transmission channel assigning means for setting the transmission channel by raising the known frequency channel of the next candidate to the known frequency channel, and newly setting the clear channel as the known frequency channel of the next candidate;
A carrier sense for detecting whether or not the frequency channel can be used, and a communication means capable of receiving transmission data transmitted from the wireless transmission device through the reception channel when a predetermined reception channel is set. It is characterized by having.

A wireless transmission / reception system according to claim 8 is the wireless transmission / reception system according to claim 5, 6 or 7 , wherein the first wireless transmission device and the first wireless reception device are provided on one side, and the second is provided on the other side. Both having a wireless transmission device and a second wireless reception device and performing communication between the first wireless transmission device and the second wireless reception device and between the second wireless transmission device and the first wireless reception device, respectively. This is a radio transmission / reception system for the user.

Furthermore, the wireless transmission / reception system according to claim 9 uses both of the wireless transmission / reception devices arranged so that the transmission / reception unit and the reception unit are used in the single device according to claim 5, 6, or 7 . When the wireless transceiver is in the transmission state, the other wireless receiver is in the reception state. When the other wireless transceiver is in the transmission state, one of the wireless receivers is in the reception state, and communication is performed by repeating this alternately. It is a simplex wireless transmission / reception system.

The transmission / reception channel setting method according to claim 10 is a wireless transmission / reception system that performs transmission / reception between a wireless transmission device and a wireless reception device by setting a predetermined empty channel from a plurality of frequency channels as a transmission channel and / or a reception channel. And
In the wireless transmission device, the frequency channel and the channel interval in which the carrier is detected by the carrier sense are stored, and the clear channel in which the carrier is not detected more than a certain amount is calculated in the adjacent section, and one or more known frequency channels and the clear channel are stored. Therefore, when establishing communication between the wireless reception devices, the wireless transmission device tried to communicate using the known frequency channel out of the known frequency channel and the clear channel, and communication was established. In this case, the known frequency channel is set as a transmission channel as it is, while channel data indicating the known frequency channel and the clear channel is transmitted to the wireless reception device, and the channel data is received and stored in the wireless reception device. The clear channel is newly set as the next known frequency. While setting the channel, is characterized in that to continue to establish communication by setting to a known frequency channel of the newly next candidate said clear channel even in the radio receiver.

The transmission / reception channel setting method according to claim 11 is a wireless transmission / reception system that performs transmission / reception between a wireless transmission device and a wireless reception device by setting a predetermined vacant channel from a plurality of frequency channels as a transmission channel and / or a reception channel. And
In the wireless transmission device, the frequency channel and the channel interval in which the carrier is detected by the carrier sense are stored, and the clear channel in which the carrier is not detected more than a certain amount is calculated in the adjacent section, and one or more known frequency channels and the clear channel are stored. Therefore, when establishing communication between the wireless reception devices, the wireless transmission device tried to communicate using the known frequency channel out of the known frequency channel and the clear channel, and communication was established. In this case, the known frequency channel is set as a transmission channel as it is, while channel data indicating the known frequency channel and the clear channel is transmitted to the wireless reception device, and the channel data is received and stored in the wireless reception device. Aside,
If communication cannot be established with the known frequency channel, the wireless transmission device changes to the known frequency channel for which communication could not be established, and sets the next candidate known frequency channel as a transmission channel, and newly sets the clear channel. Is set as the next candidate known frequency channel, while the wireless receiver is switched to the known frequency channel for which communication could not be established, and the next candidate known frequency channel is moved up and set as the receiving channel, and the clear channel is newly set. It is characterized in that communication is established by setting to the next candidate known frequency channel.

In the wireless transmission device and the transmission channel setting method of the present invention, the clear channel is calculated based on the carrier sensed state when the power is turned on, and the previously used frequency channel (known frequency channel) and the clear channel are stored. If communication is possible using the previously used frequency channel, the previously used frequency channel and clear channel are stored as the next candidate known frequency channel, while transmission is possible using the previously used frequency channel. If not, communication is attempted with the known frequency channel of the next candidate, and a new clear channel is recalculated.
Therefore, in preparation for a case where communication cannot be established, the frequency channel to be used next can be stored as a next candidate and can be sequentially updated to a new one according to the communication state.
Therefore, carrier sensing is performed in order on frequency channels that have a high possibility of being used in advance, so that it is possible to shorten the time until communication is established again after communication is interrupted.

Further, in the wireless transmission / reception system and transmission / reception channel setting method of the present invention, the known frequency channel and clear channel data obtained by the wireless transmission device are transmitted as channel data to the wireless reception device at the start of communication. In case the communication cannot be established not only in the apparatus but also in the wireless reception apparatus, the frequency channel to be used next is stored as the next candidate and updated to a new one when communication is resumed.
Accordingly, since the frequency channel is switched similarly to the wireless transmission device, the frequency channel of the wireless reception device can be quickly matched with the frequency channel of the wireless transmission device.

Hereinafter, as an example of the present invention, an example will be described in which an operator remotely controls a control device using a specific low-power wireless transmission / reception system that can transmit and receive each other by a simplex method. As an embodiment, a description will be given assuming that 40 frequency channels can be used at intervals of 12.5 kHz between frequency channels 429.250 MHz and 4297375 MHz.
FIG. 1 shows a wireless transmission / reception system according to the present invention, which includes an operation unit 10 operated by an operator and a communication unit 20 mounted on a control device 28 such as an in-vehicle crane. In this wireless transmission / reception system, the communication unit 20 corresponds to the wireless transmission device of the present invention.

First, the operation unit 10 includes an operation unit 1 for an operator to operate a control device, a control unit 2 including a microcomputer, a radio wave communication state, power consumption, and a control state for operating a control device such as a crane. And the like, a high-frequency circuit unit (RF unit) 4, an antenna 5, and a storage device 6 including a rewritable nonvolatile memory for storing data of a frequency channel to be used. .
Here, the operation unit 1 has, for example, a plurality of toggle switches, and by operating the toggle switches, an operation signal can be output by operating each of the one end side and the other end side with respect to the neutral position. it can. For example, if the control device is an in-vehicle crane, the crane (boom) can be operated in pairs such as turning left and right, turning the boom, hoisting and lowering the winch, lifting and lowering the boom. used.
The operation unit 1 includes a tact switch for performing a secondary operation such as storing a hook, switching the display contents of the display unit 3, and switching various operation modes.
In addition, the operation unit 1 is provided with a trigger type switch, for example, for controlling the operation speed during the operation described above.

Next, when an operation signal corresponding to the operation amount is output from the operation unit 1, the control unit 2 creates a transmission signal based on the operation signal and outputs the transmission signal to the high-frequency circuit unit 4 described later. In addition to this, the control unit 2 controls the high-frequency circuit unit 4 based on carrier sense data executed by the high-frequency circuit unit 4 or based on known frequency channel data stored in the storage device 6. A control signal for controlling the PLL transmission circuit of the circuit unit 4 to set a predetermined frequency channel and a control signal for controlling the high-frequency circuit unit 4 in the power saving mode are output.
In the “power saving mode”, the control unit 2 senses that the operation unit 1 has not been operated for a certain period of time (for example, several seconds to several minutes), and the high frequency circuit unit 4 is turned off to reduce power consumption. It is something to be made.

  The high frequency circuit unit 4 modulates and amplifies the transmission signal from the control unit 2 and transmits the signal from the antenna 5 using a carrier wave of the set frequency channel, or demodulates the signal transmitted from the communication unit to control the control unit 2. It is configured to output as a received signal. In addition, as described above, it has a function of performing carrier sense whether or not a frequency channel to be used is already used.

  On the other hand, the communication unit 20 is mounted on the control device 28 and outputs a control signal to the controller 27 that controls the control device 28 according to the operation of the operation unit 10. At the same time, from the controller 27, for example, what kind of operation the control device 28 can operate on the communication unit 20, or what state the control device 28 is in, for example, by a sensor mounted on the control device 28. It conveys device information such as

Hereinafter, the communication unit 20 will be described in detail with reference to FIGS. 1 and 2.
The communication unit 20 is a bidirectional transmission / reception system capable of transmitting / receiving data to / from the operation unit 10 using the same frequency channel as described above.
Then, a control unit 21 composed of a microcomputer, a display unit 22 for displaying the power supply state, radio wave state, information on the control device and what operation is being performed based on a command from the control unit 21, control It comprises a serial interface 23 for transmitting / receiving control signals as serial data to / from the device 27, a high frequency circuit section (RF section) 24, an antenna 25, a storage device 26 as a second storage means for storing a known frequency channel and the like. ing.

The control unit 21 includes a control unit 30 that controls the communication unit 20 in an integrated manner, an RF control unit 31 that controls the high-frequency circuit unit 24, a clear channel calculation unit 32 that calculates a clear channel, and data based on a known frequency channel. A channel allocating unit 33 for storing the clear channel calculated by the clear channel calculating unit in the storage device 26 as a known frequency channel in place of the known frequency channel for which communication could not be established. The temporary storage means 34 for temporarily storing the empty channel at the time of carrier sense and the clear channel, the serial interface means 35 for connecting the serial interface 27 and the control means 30, and the received signal from the high frequency circuit section 24. Demodulated as control signal and control means 30 And the decoding / encoding means 36 for modulating the control signal from the control means into a transmission signal, the device identification number (ID) of the communication unit 21 is stored, and the transmission signal from the operation unit 10 is transmitted to the own communication unit 20. It is comprised from the apparatus identification means 37 which determines whether it respond | corresponds.

  Similarly to the high-frequency circuit unit 4 of the operation unit 10, the high-frequency circuit unit (RF unit) 24 is controlled to switch between transmission and reception based on a control signal from the RF control means 31, and to enter a power saving mode. The high-frequency circuit unit 24 has means for carrier-sensing an empty frequency channel, and has a circuit for amplifying / demodulating a signal received from the antenna and modulating / amplifying a transmission signal from the encoding / decoding means. Yes.

Next, an operation of a main part of the control unit 21 and a method for setting a transmission / reception channel of the communication unit 20 will be described.
First, when the high frequency circuit unit 24 senses all 40 frequency channels when the power is turned on, it detects which frequency channel is an empty channel and stores it in the temporary storage means 34 as the first storage means. Remembered. The clear channel calculation means 32 calculates which frequency channel is optimal for transmission (and reception channel) based on the data of the empty channel.

  Specifically, as shown in the spectrum waveform diagram of FIG. 5, when carrier sense is performed, for example, the frequency channel is free with respect to the used frequency channels (f2, f5, f13, etc. in FIG. 5A). When the clear channel region is set and there are a plurality of clear channel regions, the frequency channel (f9) having the widest clear channel region and the farthest frequency channel from the used frequency channels (f5, f13) Is calculated as the clear channel fc and stored in the temporary storage unit 34. At this time, a threshold value is provided, and a low reception level is excluded. In addition, it is preferable that the clear channel is 3 channels or more away from the frequency channel being used (for example, 3 channels). Set the channel.

  Further, in the storage device 26, the frequency channel used in the previous communication or the known frequency channel of the frequency channel recognized as the clear channel in the previous carrier sense is sequentially entered as the first and second candidates. It is remembered. At the start of communication, first, the channel allocating means 33 senses whether or not these plurality of known frequency channels are vacant channels, and if the communication on the known frequency channels cannot be established, the channel allocating unit 33 cannot establish it. The frequency channel is stored in the temporary storage unit 34 as a frequency channel in use, the second candidate known frequency channel is moved up to the first candidate known frequency channel, and the clear channel fc is set as the next candidate (second candidate). The known frequency channel fb is stored in the storage device 26. Then, the clear channel calculation means 32 reselects the clear channel fc because a change occurs in the frequency channel being used.

  When a frequency channel that can be transmitted is found in this way, at the start of communication, the communication unit 20 becomes a calling side and transmits a transmission signal shown in FIG. 6A (this is called calling). This transmission signal is a channel data consisting of preamble, frame synchronization, identification signal (whether it is a signal at the time of call or a signal at the time of call, or the state of normal communication), the frequency channel currently being transmitted, and the clear channel The control device type, ID for identifying itself, and error detection code CRC are included.

On the other hand, the operation unit 10 finds the frequency channel in which the carrier exists while detecting the carrier, determines whether the ID of the transmission signal is from the communication unit 20 corresponding to itself (the own station), and matches. If so, a transmission signal as shown in FIG. 6B is transmitted from the operation unit 10 as a response from the called party (this is called a called party). The operation unit 10 stores the channel data transmitted from the communication unit 20 in the storage device 6 and sets a transmission channel and a reception channel in the communication unit 20 based on the channel data.
If communication cannot be established due to jamming radio waves or the operation unit 10 enters the power saving mode, the channel data is newly set and the data at the time of the call is transmitted from the communication unit 20 again. The channel data of the storage device 6 is updated at the time of reconnection.

The above-described transmission / reception channel setting method will be described in detail with reference to the flowcharts of FIGS.
First, when the communication unit 20 corresponding to the calling side is turned on (step S121), the communication unit 20 calls the channel data including the frequency channel used last time and the previous clear channel from the storage device 26 as the known frequency data, and the frequency The channel is the first candidate fa, the clear channel is the second candidate fb, and a known frequency channel is set (step S122). Next, all available frequency channels (for example, 40 waves) are carrier sensed (step S123), and the current clear channel is calculated by the clear channel calculating means (step S124).

Then, the transmission frequency channel is set to the first candidate frequency channel fa, carrier sense is performed with the first candidate frequency channel fa (step S126), and if it is confirmed that the channel is an empty channel, this frequency channel is set as a transmission / reception channel (step S127) The transmission of the current clear channel fc data obtained in step S124 together with the frequency data of the first candidate is started with the transmission signal at the time of calling (step S128), and the response from the called side is waited for. The call reception mode is entered (step S129).
If the frequency channel is already used in step S127, the second candidate frequency channel fb is moved up to the first candidate frequency channel fa, and the previous clear channel is moved up to the second candidate frequency channel for transmission / reception. set to the channel (step S134), and recalculate the current clear channel (step S135), and stored in the temporary storage unit 34 (step S136), it returns to the setting of the frequency (step S 125).

If the second candidate frequency channel is also used, based on the second candidate frequency channel, for example, the first wave (f1) of 40 waves that can be used by the second candidate frequency channel. In this case, the fourth candidate (f4), the seventh wave (f7),..., And the next candidate frequency channel such as the third and the fourth with the frequency channel (fb + 3) spaced by a certain interval, with three waves in between. use. Conversely, the frequency channel may be (fb-3) with fewer 3 waves.
Next, when the received signal can be confirmed in the called reception mode, it is confirmed from the operation unit 10 of the own station or by ID or the like to determine whether it is addressed to the own station (step S130), and communication is started. (Step S131).
If the received signal is not from the operation unit 10 of the own station, the process returns to step S125, the frequency is set again by fa, and carrier sense is performed (step S126).
After the start of communication, when a communication error is detected whether the generated (step S132), continues the communications as if there is no error (step S133), an error has occurred, the process returns to step S 125, again fa To set the frequency channel and perform carrier sense again.

On the other hand, as shown in FIG. 4, the called-side operation unit 10, when turned on (step S <b> 101), similarly to the communication unit 20, the frequency previously used as known frequency data from the storage device 6. The channel data composed of the channel and the previous clear channel is called, and the frequency channel is set as the first candidate and the clear channel is set as the second candidate, and the known frequency data is set (step S102).
Next, the first candidate frequency channel fa is selected as a transmission / reception frequency channel (step S103), and carrier sense is performed to determine whether this frequency channel is used (step S104).
If there is a carrier (step S105), there is a possibility of a transmission signal from the communication unit 20, so the call reception mode is entered (step S106), whether the received signal is from the communication unit 20 of the own station, ID, etc. (Step S107). If the data addressed to the local station cannot be received, the second candidate frequency channel fb is set to the first candidate frequency channel fa (step S113), and the previous clear channel is set to the second candidate frequency as in the communication unit 20. The frequency channel is set to fb, and the process returns to step S103 to sense the carrier. If there is no carrier even in the second candidate frequency channel, the frequency channel of the next candidate is set according to the same rule as the third candidate and the fourth candidate set in the communication unit 20.

If it is from the communication unit of the local station, the called transmission is started (step S108).
Thereafter, communication with the communication unit 20 is started (step S 109 ). Based on the currently transmitted frequency channel and the clear channel fc transmitted from the communication unit 20, the first candidate frequency channel in the storage device 6 is used. In addition, the setting of the second candidate frequency channel (fa, fb) is updated (step S 110 ). After the start of communication, it is detected whether or not a communication error has occurred (step S1111). If there is no error, communication is continued as it is (step S112). If an error occurs, the process returns to step S103 and the frequency is set again. Set and do from carrier sense.

That is, the characteristics of the wireless transmission / reception apparatus and the transmission / reception channel setting method shown in the embodiment are as follows:
(A) Normally, only the communication unit 10 performs carrier sense on all the allocated frequency channels. Moreover, only limited conditions such as when the power is turned on.
(B) The operation unit 10 and the communication unit 20 store not only the previously used frequency channel but also a clear channel with good carrier conditions in (a) as a next candidate frequency channel.
(C) In addition, the clear channel is updated according to the usage state of the frequency channel, and is transmitted as channel data from the communication unit 20 to the operation unit 10 at the time of calling, and the same candidate frequency channel is connected to the communication unit 20 and the operation unit. 10, the frequency channel candidates that can be shared as information and to be switched next are selected.

  From the above, once communication is established between the communication unit 20 and the operation unit 10, the frequency of the next candidate is particularly determined when the communication is interrupted due to the jamming radio wave or the communication that has been interrupted due to the power saving mode is reestablished. The clear channel is the most suitable channel for communication, and this clear channel is updated sequentially each time it is disturbed. Therefore, if these channels are used as transmission / reception channels, they are simply used the previous time as before. If the frequency channel is stored, or if communication cannot be established, communication can be recovered with the next candidate frequency channel, compared to switching the frequency channel in a predetermined order. The possibility is extremely high, and the time until communication is restored can be greatly shortened.

In the above embodiment, even if a frequency channel once used by another device can be used again, it is not incorporated in the calculation of the clear channel region and the clear channel recalculation, but is free. In this method, it is not necessary to perform carrier sensing for every frequency channel that can be used each time to identify the frequency channel that is being used, so that the clear channel can be calculated faster.
In addition, since the optimum clear channel can be obtained again from all the frequency channels by turning on the power again, there is practically no problem in a telecontrol device such as an in-vehicle crane.

In the above-described embodiment, the description has been given using the telecontrol device that can transmit and receive each other by simplex method. However, the operator operates the transmitter and the receiver is installed on the control device side. Even if it is applied to a wireless transmission device and a transmission channel setting method that can realize unidirectional remote control by operating a transmitter, the communication unit of the above embodiment corresponds to the wireless transmission device, and the operation unit is In the case of a receiver, the time until the communication unit starts calling corresponds to the setting of the transmission channel between the transmitter and the receiver, and the time from the interruption of communication in the jamming or power saving mode to the establishment of communication again. The effect that can be shortened is the same.
In addition, a telecontrol device that has a transmission unit and a reception unit separately and can transmit and receive each other in a duplex manner can be regarded as a wireless transmission device. The wireless transmission device of the present invention and its transmission channel The setting method can be applied.
In addition to the telecontrol device, it can also be used for a telemeter device for measuring equipment.

1 is a block diagram showing a wireless transmission device and a wireless transmission / reception system of the present invention. 1 is a detailed diagram showing a wireless transmission device and a wireless transmission / reception system of the present invention. It is the flowchart which showed operation | movement of the radio | wireless receiver of the radio | wireless transmission / reception system of this invention. It is the flowchart which showed operation | movement of the radio | wireless transmission apparatus of the radio | wireless transmission / reception system of this invention. The figure which showed the clear channel setting method of this invention. The figure which showed the transmission / reception data of this invention. It is the flowchart which showed operation | movement of the radio | wireless receiver of the conventional radio | wireless transmission / reception system. It is the flowchart which showed operation | movement of the wireless transmission apparatus of the conventional wireless transmission / reception system. It is the figure which showed the transmission / reception data of the conventional radio | wireless transmission / reception system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Operation part 2 Control part 3 Display part 4 High frequency circuit part 5 Antenna 6 Memory | storage device 10 Operation unit 20 Communication unit 21 Control part 22 Display part 23 Serial interface 24 High frequency circuit part 25 Antenna 26 Storage device (2nd memory | storage means)
31 RF control means 32 Clear channel calculation means 33 Channel allocation means 34 Temporary storage means (first storage means)
35 Serial interface means 36 Decoding / encoding means 37 Model identification means

Claims (11)

A wireless transmission device configured to perform transmission by setting a predetermined empty channel as a transmission channel from a plurality of frequency channels,
Carrier sense for detecting a vacant channel from the plurality of frequency channels, and first storage means for storing, as carrier information, a frequency channel in which a carrier is detected by the carrier sense and a channel interval value;
Based on the carrier information stored in the first storage means, a clear channel calculation unit for calculating a clear channel in which no carrier is detected in a certain interval in an adjacent section; the clear channel and one or more known frequency channels; Second storage means for storing
An attempt is made to establish communication using the known frequency channel stored in the second storage means, and if communication is established, the known frequency channel is set as a transmission channel as it is, and the clear channel is newly set. A transmission channel allocating means for setting a candidate known frequency channel;
Communication means capable of transmitting required transmission data through the transmission channel when a predetermined transmission channel is set,
A wireless transmission device that transmits channel data indicating the known frequency channel and the clear channel to a wireless reception device when communication is started or communication is established to resume communication . A wireless transmission device configured to perform transmission by setting a predetermined empty channel as a transmission channel from a plurality of frequency channels,
Carrier sense for detecting a vacant channel from the plurality of frequency channels, and first storage means for storing, as carrier information, a frequency channel in which a carrier is detected by the carrier sense and a channel interval value;
Based on the carrier information stored in the first storage means, a clear channel calculation unit for calculating a clear channel in which no carrier is detected in a certain interval in an adjacent section; the clear channel and one or more known frequency channels; Second storage means for storing
An attempt is made to establish communication using the known frequency channel stored in the second storage means, and if the communication cannot be established, the next candidate including the clear channel is changed to the known frequency channel for which communication could not be established. A transmission channel allocating means for setting a transmission channel by raising a known frequency channel;
Communication means capable of transmitting required transmission data through the transmission channel when a predetermined transmission channel is set,
A wireless transmission device that transmits channel data indicating the known frequency channel and the clear channel to a wireless reception device when communication is started or communication is established to resume communication . A wireless transmission device configured to perform transmission by setting a predetermined empty channel as a transmission channel from a plurality of frequency channels,
Carrier sense for detecting a vacant channel from the plurality of frequency channels, and first storage means for storing, as carrier information, a frequency channel in which a carrier is detected by the carrier sense and a channel interval value;
Based on the carrier information stored in the first storage means, a clear channel calculation unit for calculating a clear channel in which no carrier is detected in a certain interval in an adjacent section; the clear channel and one or more known frequency channels; Second storage means for storing
Attempt to establish communication using the known frequency channel stored in the second storage means, and if communication can be established, the known frequency channel is set as a transmission channel as it is, whereas if communication cannot be established A transmission channel assigning means for setting the transmission channel by raising the next candidate known frequency channel instead of the known frequency channel for which communication could not be established, and setting the clear channel as the next candidate known frequency channel;
Communication means capable of transmitting required transmission data through the transmission channel when a predetermined transmission channel is set,
A wireless transmission device that transmits channel data indicating the known frequency channel and the clear channel to a wireless reception device when communication is started or communication is established to resume communication .   The clear channel calculation unit calculates a clear channel at the start of communication when power is turned on and when communication cannot be established, and the calculated clear channel for the second storage means is newly set or already set The radio transmission apparatus according to claim 1, wherein the clear channel is updated. A wireless transmission / reception system that performs transmission / reception between a wireless transmission device and a wireless reception device by setting a predetermined vacant channel from a plurality of frequency channels as a transmission channel and / or a reception channel,
A carrier sense for detecting a vacant channel from the plurality of frequency channels; a first storage means for storing a frequency channel in which a carrier is detected by the carrier sense and a channel interval value as carrier information; Based on the carrier information stored in the first storage means, a clear channel calculation unit for calculating a clear channel in which no carrier is detected in a certain interval or more in an adjacent section, and the clear channel and one or more known frequency channels An attempt is made to establish communication using the second storage means for storing and the known frequency channel stored in the second storage means, and when the communication is established, the known frequency channel is set as a transmission channel as it is. In addition, the clear channel is newly set as the next candidate for the transmission channel. It includes a signal channel allocation means, when a predetermined transmission channel is set, and communication means capable of transmitting the required transmission data by the transmission channel,
At the start of communication or when establishing communication to resume communication, the wireless transmission device transmits channel data indicating the known frequency channel and the clear channel to the wireless reception device,
The wireless reception device stores the channel data, and sets a known frequency channel as a reception channel based on the channel data, and a transmission channel assignment for newly setting the clear channel as a next known known frequency channel Means,
A carrier sense for detecting whether or not the frequency channel can be used, and a communication means capable of receiving transmission data transmitted from the wireless transmission device through the reception channel when a predetermined reception channel is set. A wireless transmission / reception system comprising: A wireless transmission / reception system that performs transmission / reception between a wireless transmission device and a wireless reception device by setting a predetermined vacant channel from a plurality of frequency channels as a transmission channel and / or a reception channel,
A carrier sense for detecting a vacant channel from the plurality of frequency channels; a first storage means for storing a frequency channel in which a carrier is detected by the carrier sense and a channel interval value as carrier information; Based on the carrier information stored in the first storage means, a clear channel calculation unit for calculating a clear channel in which no carrier is detected in a certain interval or more in an adjacent section, and the clear channel and one or more known frequency channels Attempts to establish communication using the second storage means for storing and the known frequency channel stored in the second storage means, and if communication cannot be established, the communication is changed to the known frequency channel for which communication could not be established. The known frequency channel including the clear channel is moved up and set as the transmission channel. A transmission channel allocation unit that, when a predetermined transmission channel is set, and communication means capable of transmitting the required transmission data by the transmission channel,
At the start of communication or when establishing communication to resume communication, the wireless transmission device transmits channel data indicating the known frequency channel and the clear channel to the wireless reception device,
The wireless reception device sets the known frequency channel as the receiving channel based on the channel means and the storage means for storing the channel data, but communication cannot be established when communication cannot be established on the known frequency channel. A transmission channel allocating means for setting a transmission channel by raising a known frequency channel of a next candidate including the clear channel instead of the known frequency channel;
A carrier sense for detecting whether or not the frequency channel can be used, and a communication means capable of receiving transmission data transmitted from the wireless transmission device through the reception channel when a predetermined reception channel is set. A wireless transmission / reception system comprising: A wireless transmission / reception system that performs transmission / reception between a wireless transmission device and a wireless reception device by setting a predetermined vacant channel from a plurality of frequency channels as a transmission channel and / or a reception channel,
A carrier sense for detecting a vacant channel from the plurality of frequency channels; a first storage means for storing a frequency channel in which a carrier is detected by the carrier sense and a channel interval value as carrier information; Based on the carrier information stored in the first storage means, a clear channel calculation unit for calculating a clear channel in which no carrier is detected in a certain interval or more in an adjacent section, and the clear channel and one or more known frequency channels An attempt is made to establish communication using the second storage means for storing and the known frequency channel stored in the second storage means, and when the communication is established, the known frequency channel is set as a transmission channel as it is. On the other hand, if communication cannot be established, the known frequency channel for which communication could not be established. A transmission channel allocating means for setting up the next candidate known frequency channel as a transmission channel, and a communication means capable of transmitting required transmission data through the transmission channel when a predetermined transmission channel is set And
At the start of communication or when establishing communication to resume communication, the wireless transmission device transmits channel data indicating the known frequency channel and the clear channel to the wireless reception device,
The wireless reception device sets the known frequency channel as the receiving channel based on the channel means and the storage means for storing the channel data, but communication cannot be established when communication cannot be established on the known frequency channel. A transmission channel assigning means for setting the transmission channel by raising the known frequency channel of the next candidate to the known frequency channel, and newly setting the clear channel as the known frequency channel of the next candidate;
A carrier sense for detecting whether or not the frequency channel can be used, and a communication means capable of receiving transmission data transmitted from the wireless transmission device through the reception channel when a predetermined reception channel is set. A wireless transmission / reception system comprising: One has a first wireless transmission device and a first wireless reception device, and the other has a second wireless transmission device and a second wireless reception device, and the first wireless transmission device and the second wireless reception device. receiving device and between the second radio transmitting apparatus and claim 5 or 6 or 7 radio transceiver system according characterized in that it is a two-way radio transceiver system for communication respectively between the first wireless receiver. A wireless transmission / reception device arranged so that a transmission unit and a reception unit are used in one device is used for both, and when one wireless transmission / reception device is in a transmission state, the other wireless reception device is in a reception state, wireless transceiver device in the receiving state one of the radio receiving apparatus when the transmission state, claim 5 or 6 or 7, characterized in that by repeating this alternately a radio transceiver system of the simplex method of communicating The wireless transmission / reception system described. A wireless transmission / reception system that performs transmission / reception between a wireless transmission device and a wireless reception device by setting a predetermined vacant channel from a plurality of frequency channels as a transmission channel and / or a reception channel,
In the wireless transmission device, the frequency channel and the channel interval in which the carrier is detected by the carrier sense are stored, and the clear channel in which the carrier is not detected more than a certain amount is calculated in the adjacent section, and one or more known frequency channels and the clear channel are stored. Therefore, when establishing communication between the wireless reception devices, the wireless transmission device tried to communicate using the known frequency channel out of the known frequency channel and the clear channel, and communication was established. In this case, the known frequency channel is set as a transmission channel as it is, while channel data indicating the known frequency channel and the clear channel is transmitted to the wireless reception device, and the channel data is received and stored in the wireless reception device. The clear channel is newly set as the next known frequency. While setting the channel, transmission and reception channel setting method characterized by going to establish a new communication is set to a known frequency band of the next candidate said clear channel even in the radio receiver. A wireless transmission / reception system that performs transmission / reception between a wireless transmission device and a wireless reception device by setting a predetermined vacant channel from a plurality of frequency channels as a transmission channel and / or a reception channel,
In the wireless transmission device, the frequency channel and the channel interval in which the carrier is detected by the carrier sense are stored, and the clear channel in which the carrier is not detected more than a certain amount is calculated in the adjacent section, and one or more known frequency channels and the clear channel are stored. Therefore, when establishing communication between the wireless reception devices, the wireless transmission device tried to communicate using the known frequency channel out of the known frequency channel and the clear channel, and communication was established. In this case, the known frequency channel is set as a transmission channel as it is, while channel data indicating the known frequency channel and the clear channel is transmitted to the wireless reception device, and the channel data is received and stored in the wireless reception device. Aside,
If communication cannot be established with the known frequency channel, the wireless transmission device changes to the known frequency channel for which communication could not be established, and sets the next candidate known frequency channel as a transmission channel, and newly sets the clear channel. Is set as the next candidate known frequency channel, while the wireless receiver is switched to the known frequency channel for which communication could not be established, and the next candidate known frequency channel is moved up and set as the receiving channel, and the clear channel is newly set. A transmission / reception channel setting method, characterized in that communication is established by setting a known frequency channel as a next candidate.

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