JPH09224279A - One-wave transmission reception radio communication system and its equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To conduct all processing from radio connection till data transmission reception automatically by a selected radio frequency available among plural radio frequencies. SOLUTION: A caller radio equipment selects sequentially frequencies to select one radio frequency to retrieve an idle channel frequency. When it is discriminated that the selected radio frequency is an available idle channel frequency, a connection request signal is sent by the radio frequency continuously for a time T. A called radio equipment switches sequentially frequencies and selects one radio frequency and retrieves a connection request signal from a caller radio equipment based on the signal level of the radio frequency. When the connection request signal is received, the called radio equipment sends a connection reply signal with respect to the connection request signal. Upon the receipt of the connection reply signal, the caller radio equipment sends/ receives data with the called radio equipment by using the selected one radio frequency.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention selects one available radio frequency from a plurality of radio frequencies, and performs one-wave transmission / reception in which data is transmitted / received by wirelessly connecting with the selected one radio frequency. The present invention relates to a wireless communication system and device.

[0002]

2. Description of the Related Art Conventionally, a fixed channel system and a dedicated control channel system have been generally known as a wireless communication system for performing wireless connection and data transmission / reception with one radio frequency.

In the fixed channel system, one radio frequency channel to be used is fixedly set. In the example of FIG. 13, the channel is fixed to the Mth radio frequency out of the N usable radio frequencies.

In this fixed channel system, first, when a calling wireless device makes a transmission request to a called wireless device, it is checked whether or not the Mth wireless frequency, which is a fixed channel, is in an idle state. Here, if the M-th radio frequency channel is not available, data transmission is disabled. On the other hand, if the Mth radio frequency is vacant, a connection request signal is sent to the called radio. The called radio searches for the connection request signal from the calling radio using the Mth radio frequency of the fixed channel, and when the connection request signal is detected, the calling radio uses the Mth radio frequency. Sends a connection response signal to the machine. When the calling radio receives this connection response signal, data transmission by the Mth radio frequency of the fixed channel is mutually performed between the calling radio and the called radio.

The dedicated control channel system is, for example, PHS.
The basic idea is applied to (Personal Handyphone System) and the like, and a control channel for controlling exchange of wireless signals is provided separately from a radio frequency channel for data transmission. In the example of FIG. 14, the Mth radio frequency is used as the control channel among the N usable radio frequencies.

In this dedicated control channel system, first, the calling radio sequentially switches frequencies to search for an empty channel. When the calling radio detects the frequency of the idle channel (Mth frequency in the example of FIG. 14), the calling radio includes data specifying the radio frequency channel to be used for the called radio at the frequency of the control channel. Send a connection request signal.
The called radio searches for a connection request signal from the calling radio using the frequency of the control channel.When the connection request signal is detected, the frequency is switched to the radio frequency specified by the connection request signal, and the Check if the radio frequency channel is idle. Then, if the channel of the radio frequency is vacant, a connection response signal is sent to the calling radio. The calling radio switches to the radio frequency specified by the connection request signal and searches for the connection response signal from the called radio, and when the connection response signal is received, data transmission by that radio frequency is performed by the calling radio. And the called radio.

[0007]

However, in the above-mentioned fixed channel system, even if there are a plurality of radio frequencies that can be used for data transmission, only one radio frequency channel can be used (in the example shown in the figure, the Mth channel is used). However, if the radio frequency is in use, there is a problem in that it cannot be used until the data transmission is completed and the channel becomes free, and there is a problem of having to wait. In addition, there is a problem that data transmission cannot be performed even though other radio frequencies are available.

The dedicated control channel system requires a dedicated control channel, and the radio frequency of this control channel (Nth frequency in the illustrated example) cannot be used for data transmission and can be used. The number of channels of different radio frequencies will be reduced. In addition, when data transmission is performed, a dedicated control channel must be passed through, so if the control channel is congested, there is a problem that it cannot be used even if another radio frequency channel is available during that time.

Therefore, the present invention has been made in view of the above problems, and selects one available radio frequency from a plurality of radio frequencies, and uses this one radio frequency to transmit data from a wireless connection. An object of the present invention is to provide a one-wave transmission / reception wireless communication system and device capable of automatically performing all transmission / reception.

[0010]

In order to achieve the above object, the one-wave transmission / reception wireless communication system according to claim 1 according to the present invention comprises:
In a one-wave transmission / reception wireless communication system in which one calling radio 1 and one called radio 2 are wirelessly connected and data is transmitted / received by one radio frequency available from a plurality of radio frequencies The calling wireless device sequentially switches the plurality of wireless frequencies to search for one available frequency, and the one wireless frequency determined to be available in this search causes the called wireless device to be a communication partner. A connection request signal including a radio-specific code that specifies the connection request signal is continuously and repeatedly transmitted for a time sufficient for the called radio to switch all radio frequencies and search for frequencies, and the connection request signal is transmitted. After stopping, the response of the called radio is confirmed by searching and identifying the connection response signal sent back from the called radio at the radio frequency, and the called radio is Multiple radio frequencies While sequentially switching, the connection request signal from the calling radio is searched, and when the connection request signal from the calling radio can be received and identified, the calling radio performs a search operation for a connection response signal. The connection response signal is transmitted at the same frequency in accordance with the transfer timing, and the call is made at one radio frequency with the same frequency selected by the search operation of each frequency of the calling radio and the called radio. A feature is that the wireless device and the called wireless device are wirelessly connected to alternately transmit and receive data.

According to the one-wave transmission / reception wireless communication system of claim 2, one radio frequency available from a plurality of radio frequencies is used.
In a one-wave transmission / reception wireless communication system in which a single calling radio 1 and a plurality of called radios 2 are sequentially wirelessly connected to transmit and receive data, the calling radio is configured to transmit the plurality of radio frequencies. Are sequentially switched to search for an available frequency, and one radio frequency determined to be available in this search includes a code for identifying all called radios and designation information for the response order of the called radios. The connection request signal is continuously and repeatedly transmitted for a time sufficient for all the called radios to switch and search for a predetermined radio frequency, and after the transmission of the connection request signal is stopped, The response of each called wireless device is confirmed by searching for and identifying the connection response signals sent back from each of the called wireless devices in the specified order. The radio frequencies of While searching for a connection request signal from the calling radio while receiving and identifying the connection request signal from the calling radio, the calling radio shifts to a connection response signal searching operation. The connection response signals are transmitted at the same frequency according to the order specified by the connection request signal in accordance with the timing, and the same frequency selected by the search operation of the respective frequencies of the calling radio and the called radios. In accordance with the order specified by the connection request signal, the calling wireless device and each called wireless device are wirelessly connected to each other by one radio frequency, and data is alternately transmitted and received.

According to the one-wave transmission / reception wireless communication device of the present invention, the one-wave transmission / reception wireless communication device uses one radio frequency available from a plurality of radio frequencies.
In a one-wave transmission / reception wireless communication device that wirelessly connects between one calling radio device 1 and one called radio device 2 to transmit / receive data, the calling radio device uses the plurality of radio frequencies. Frequency switching means 3c for sequentially switching to select one frequency
A determination means 3d for determining whether or not one radio frequency switched and selected by the frequency switching means is available; and a connection request signal including a radio-specific code for designating a called radio to be a communication partner. Signal transmitting means 3e for continuously and repeatedly transmitting for a sufficient time for the called radio to switch all radio frequencies and search for frequencies, and to be returned from the called radio in response to the connection request signal. Identification means 3f for identifying the quality of the incoming connection response signal, and one radio frequency which is determined to be available by the determination means when the response from the called radio can be confirmed by the identification means. And a transmitting / receiving means 4 for transmitting / receiving data by wirelessly connecting to a call radio device, wherein the called radio device comprises:
A frequency switching unit 5b for sequentially switching the plurality of radio frequencies to select one frequency, and identifying the presence or absence of a connection request signal from the calling radio by the one radio frequency switched and selected by the frequency switching unit. When the identification unit 5c and the identification unit identify that there is a connection request signal from the calling radio device, the connection response signal corresponding to the connection request signal is transmitted in synchronization with the calling radio device. Between the signal sending means 5d and the calling radio by the same one radio frequency as the calling radio when the identifying means identifies that there is a connection request signal from the calling radio. It is characterized in that it is provided with a transmitting / receiving means 6 for wirelessly connecting and transmitting / receiving data.

According to another aspect of the present invention, there is provided a one-wave transmission / reception wireless communication device, wherein one radio frequency is available from a plurality of radio frequencies.
In a one-wave transmission / reception wireless communication device that sequentially wirelessly connects between a plurality of calling radios 1 and a plurality of called radios 2 to transmit and receive data, the calling radio is configured to transmit the plurality of radio frequencies. Frequency switching means 3c for sequentially switching one frequency to select one frequency, determination means 3d for determining whether or not the radio frequency switched and selected by the frequency switching means is available, and all called radios to be communication partners. A connection request signal including a code for identifying the caller and designation information for the response order of the called radio is repeatedly transmitted continuously for a time sufficient for the called radio to switch all radio frequencies and search for frequencies. A signal sending means 3e, an identifying means 3f for identifying the quality of a connection response signal sent back from the called wireless device in response to the connection request signal, and one radio judged to be usable by the judging means. frequency And a transmission / reception means 4 for transmitting / receiving data in accordance with the order specified by the connection request signal by wirelessly connecting to the called wireless device, and each of the called wireless devices is a plurality of the plurality of called wireless devices. Frequency switching means 5b for sequentially switching the radio frequencies of, and selecting one frequency,
There is an identifying means 5c for identifying the presence or absence of a connection request signal from the calling radio at one radio frequency switched and selected by the frequency switching means, and a connection request signal from the calling radio by the identifying means. Signal transmission means 5d for transmitting a connection response signal corresponding to the connection request signal to the calling radio when it is identified, and the connection request signal from the calling radio by the identification means. And a transmitting / receiving means 6 for wirelessly connecting to the calling radio by the same one radio frequency as that of the calling radio when it is identified as being present, and for transmitting and receiving data in the order specified by the connection request signal. It is characterized by having.

In the one-wave transmission / reception wireless communication system according to claim 1, the connection response signal may be transmitted at a timing when the stop of the connection request signal transmitted from the calling radio is detected. .

Further, a stop signal may be added to the end of the connection request signal sent from the calling radio, and the connection response signal may be sent at the timing when the stop signal is detected.

Further, timing information for transmitting the connection response signal is added to the connection request signal transmitted from the calling radio, and the connection response signal is transmitted based on this timing information. Good.

In the one-wave transmission / reception wireless communication system according to claim 2, each of the called radios may add a code for identifying the called radio of the transmission destination after the wireless connection and send the data.

[0018]

1 is a block diagram of a one-wave transmission / reception wireless communication device according to the present invention, FIG. 2 is a frame diagram of a connection request signal transmitted from a calling radio of the device, and FIG. 3 is the same. It is a figure which shows the relationship between the connection request signal transmitted from the calling radio | wireless machine of a device, and the search time of the connection request signal by a called radio | wireless machine.

This one-wave transmission / reception wireless communication device performs wireless connection and data transmission / reception at one radio frequency available from a plurality of radio frequencies, and includes a calling radio 1 and a called radio 2. Composed.

The calling radio 1 includes a control unit (CPU) 3 and
A radio unit 4 as a transmitting / receiving means is included in the configuration. The control unit 3 includes a setting unit 3a and a data input / output unit 3
b, frequency switching means 3c, determination means 3d, signal transmission means 3e, and identification means 3f.

The setting means 3a makes various settings necessary for wireless connection and data transmission at one radio frequency. Specifically, a wireless device identification code (personal identification number) for designating the called wireless device 2 of the other party who transmits the connection request signal
Setting, the sending time (T in FIG. 7) of the connection request signal sent to the designated called wireless device 2, and after the connection request signal is stopped until the connection response signal of the called wireless device 2 is received. Setting of the spare time (t in FIG. 7), the setting of timing information that serves as a reference when the connection response signal is transmitted from the called wireless device 2, and the connection response signal from the called wireless device 2. Setting of whether to send / receive a connection confirmation signal to and from the device, the order of sending connection response signals when a plurality of called wireless devices 2 are provided, and the order of sending transmission data after wireless connection are set as necessary. It is done as appropriate.

The called radio 2 is connected to the data input / output means 3b.
The data for controlling the operation of the controlled object in which is provided is input. This data is transmitted to the called wireless device 2 designated by the setting of the setting means 3a via the wireless unit 4. For example, if the controlled object is a shovel car, data for controlling the posture such as forward / backward movement of the vehicle body and movement of the bucket is input.

Further, the data input / output unit 3b outputs the data received from the called wireless device 2 via the wireless unit 4 to the external device at the time of wireless connection. For example, if the controlled object is a shovel car, various sensor information such as the posture state, the amount of remaining fuel, and the state of the engine is received via the wireless unit 4, and the received sensor information is output to a controller as an external device. To be done. On the controller side, various states of the shovel car are displayed based on this sensor information (for example, display of the inclination angle of the vehicle body with respect to the ground, display of the remaining amount of fuel, etc.).

The frequency switching means 3c outputs a frequency switching signal to the radio section 4 so as to sequentially switch a plurality of radio frequencies and select one radio frequency. Specifically, one radio frequency is selected by switching the frequencies in order from the lowest frequency while keeping timing with a reset signal generated by a signal when the power is turned on.

The judging means 3d judges whether or not one radio frequency selected by the switching of the frequency switching means 3c is available. Specifically, the presence / absence of a vacant channel of the radio frequency is determined by the level (carrier level) of the radio signal received by the radio unit 4 at the radio frequency selected by the frequency switching unit 3c.

Then, if the level of the radio signal received by the radio section 4 at the radio frequency selected by the switching of the frequency switching means 3c is high, it is determined that the radio frequency is in use. On the other hand, if the level of the wireless signal received by the wireless unit 4 is low, it is determined that the wireless frequency is unused and is an empty channel.

The signal transmission means 3e continuously transmits a connection request signal including the radio equipment identification code set by the setting means 3a a plurality of times. Continuous connection time T of this connection request signal
Is (t2 + t3) n, where n is the number of available radio frequencies, t2 is the time required to search for a connection request signal for one radio frequency in the called radio 2, and t3 is the frequency switching time. Setting means 3 in advance for a long time
It is set by a.

As shown in FIG. 2, the connection request signal has one block of data composed of a bit synchronization signal, a frame synchronization signal, a radio identification code, and a cyclic code (CRC code) for error detection. The connection request signal is repeatedly transmitted for the time required for the called wireless device 2 to search for a signal of the connection request signal for all available radio frequencies.

Therefore, the number of blocks of the connection request signal is
The number of usable radio frequencies is n, the time of one block of the connection request signal is t1, and the time required for the signal search of the connection request signal for one radio frequency in the called radio 2 is t.
2. If the switching time of frequency is t3, (t2 + t
3) It is set to n / t1.

The bit synchronization signal is a signal for recognizing the read position of each bit of the reception signal output of the radio section 4,
It is composed of a pulse signal obtained by periodically repeating a binary signal “0, 1”. The frame synchronization signal is a signal for recognizing the start point of information, and is a signal of a plurality of bits by a combination of 0 and 1 (for example, 8 bits such as “00001111”).
Bit signal). The wireless device identification code is a code for designating the called wireless device 2 which is connected to the calling wireless device 1 by a line, and is given as a coded number (personal identification number) of the designated called wireless device 2. ing. The cyclic code is generated from the wireless device identification code at the time of transmission / reception, and when the contents of both the transmission and reception match, the content of the data is determined to be normal.

The identifying means 3f identifies whether or not the connection response signal sent back from the called wireless device 2 in response to the connection request signal is that of the called wireless device 2 designated by the connection request signal. ing. Specifically, when the radio number included in the connection request signal and the radio number included in the connection response signal are compared and matched, the connection response signal indicates the called radio 2 designated by the connection request signal. It is identified as being from.

The radio section 4 includes a transmitting means 4a and a receiving means 4
b, a switching means 4c. Transmission means 4
When a switching signal is input from the switching unit 4c and is selected for switching, a transmits a connection request signal and transmission data at the radio frequency switched and selected by the frequency switching unit 3c.

The receiving means 4b, when the switching signal is input from the switching means 4c and is switched and selected, is connected to the external radio signal by the radio frequency switched and selected by the frequency switching means 3c and the called radio device 2. A response signal or received data is being received.

The switching means 4c performs switching so that either the transmitting means 4a or the receiving means 4b is selected. That is, the switching unit 4c outputs the switching signal to the transmitting unit 4a so as to select the transmitting unit 4a when transmitting the connection request signal and transmitting the transmission data after the wireless connection. On the other hand, when searching for an available radio frequency by receiving an external radio signal after power-on, when receiving a connection response signal and received data from the called wireless device 2 in response to a connection request signal, the receiving means 4b. The switching signal is output to the receiving means 4b in order to select.

More specifically, the switching means 4c is switched to the receiving means 4b side when the power is turned on, and when the available radio frequency is detected, it is switched to the transmitting means 4a side. After that, when the connection request signal is transmitted for a predetermined time, it is switched to the receiving means 4b side and waits for the reception of the connection response signal. Then, when the connection response signal is received, the transmission means 4a is switched to, and when the data transmission is completed,
It is switched to the receiving means 4b.

The called radio 2 includes a control unit (CPU) 5 and
A radio unit 6 as a transmission / reception unit is included in the schematic configuration. The control unit 5 includes a data input / output unit 5a, a frequency switching unit 5b, an identifying unit 5c, and a response signal sending unit 5d.

The data input / output means 5a is connected to the called radio 2
The sensor information is input from the controlled object in which is provided. For example, if the controlled object is a shovel car, sensor information such as the posture state, the amount of remaining fuel, and the state of the engine is input. Further, the data input / output means 5b outputs the data received from the calling radio 1 to the controlled object at the time of wireless connection. For example, if the controlled object is a shovel car, data for controlling the posture such as forward / backward movement of the vehicle body and movement of the bucket is output to the shovel car. The received data controls the shovel car in a desired posture state.

The frequency switching means 5b outputs a frequency switching signal to the radio section 6 so as to sequentially switch a plurality of radio frequencies and select one radio frequency. Specifically, one radio frequency is selected by switching the frequencies in order from the lowest frequency while keeping timing with a reset signal generated by a signal when the power is turned on.

The identification means 5c uses the one radio frequency selected by the switching of the frequency switching means 5b to generate the calling radio 1
It is identified whether or not the connection request signal from the device has been received.
Specifically, the connection request signal from the calling wireless device 1 is searched by the level (carrier level) of the wireless signal from the wireless unit 6 at the wireless frequency selected by the frequency switching unit 5b.

If the level of the radio signal received by the radio section 6 at the radio frequency selected by the switching of the frequency switching means 5b is high, it is identified that the calling radio 1 has searched for the connection request signal. On the other hand, if the level of the wireless signal received by the wireless unit 6 is low, it is identified that the calling requester 1 has not searched for the connection request signal.

Here, the signal search time t2 of the connection request signal
As shown in FIG. 3, it is set to be at least twice the time t1 of one block of the connection request signal transmitted from the calling wireless device 1. As a result, the called wireless device 2 can detect the connection request signal regardless of where in the connection request signal the signal search is started.

The response signal sending means 5d adjusts the timing at which the calling radio 1 moves to a connection response signal searching operation.
The connection response signal corresponding to the connection request signal is transmitted at one radio frequency selected by the switching of the frequency switching means 5b.

4 to 6 are diagrams showing how to determine the timing when the called radio sends a connection response signal to the calling radio.

In FIG. 4, the wireless unit 6 detects the stop of the connection request signal transmitted from the calling wireless device 1. From the signal transmission means 5d, a connection response signal is transmitted to the calling radio 1 via the radio section 6 at this detection timing.

In FIG. 5, when the connection request signal is transmitted from the calling wireless device 1, a stop signal is added to the end of the connection request signal and transmitted. From the signal transmission means 5d, a connection response signal is transmitted to the calling wireless device 1 via the wireless unit 6 at the timing when the wireless unit 6 detects the stop signal.

In FIG. 6, when the connection request signal is transmitted from the calling wireless device 1, timing information for transmitting and receiving a response signal is added to the connection request signal and transmitted. A connection response signal is sent from the signal sending means 5d to the calling wireless device 1 via the wireless unit 6 based on the timing information received by the wireless unit 6.

The timing information is time information such as when to send back the connection response signal after sending the connection request signal, and the frame number such as sending back the connection response signal when a certain radio number is reached. Calling radio 1 as
Is set by the setting means 3a. Accordingly, it is not necessary to receive the connection request signal on the way, so that the connection error due to the reception error such as the external jamming radio wave can be reduced.

The radio section 6 includes a transmitting means 6a and a receiving means 6
b, a switching means 6c. Transmission means 6
When a switching signal is input from the switching unit 6c and is selected for switching, a transmits a connection response signal and transmission data at the radio frequency switched and selected by the frequency switching unit 5b.

When the switching signal is input from the switching means 6c and is selected for switching, the receiving means 6b is connected to the external radio signal by the radio frequency switched and selected by the frequency switching means 5b and the calling radio 1 Receiving request signal and received data.

The switching means 6c performs switching so that either the transmitting means 6a or the receiving means 6b is selected. That is, the switching unit 6c outputs a switching signal to the transmitting unit 6a so as to select the transmitting unit 6a when transmitting the connection response signal to the connection request signal from the calling radio and the transmission data after wireless connection. . On the other hand, when the connection request signal from the calling radio is searched by receiving the external wireless signal after the power is turned on, the receiving means 6b is selected to select the receiving means 6b when receiving the received data after the wireless connection.
The switching signal is output to b.

To explain further, the switching means 6c is switched to the receiving means 6b side when the power is turned on, and when the connection request signal from the calling radio 1 is detected, it is switched to the transmitting means 6a side and the connection response signal. It will be in the transmission waiting state. afterwards,
When the connection response signal to the connection request signal is transmitted, the connection is switched to the receiving means 6b side. Then, when the data is received, it is switched to the transmitting means 6a side, and when the transmission of this data is completed, it is switched to the receiving means 6b again.

Next, the communication system of the one-wave transmission / reception wireless communication device configured as described above will be described with reference to the timing chart of FIG. 7 and the flowchart of FIG. Here, one calling radio 1 is connected to a controller for remote control, and one called radio 2 is installed in a shovel car as a construction machine to remotely operate the shovel car. Take for example.

First, the power of the calling wireless device 1 is turned on and activated, and when the controller inputs data for controlling the operation of the shovel car to the data input / output means 3b, it is generated when the power is turned on. The frequency switching means 3c switches the frequencies in order from the one with the lowest frequency (first frequency) by the reset signal, selects one radio frequency, and searches for a frequency of an empty channel (ST1). When the radio frequency selected by the switching of the frequency switching means 3c is determined to be the frequency of the available channel (sixth frequency in FIG. 7) by the determination means 3d (ST2-Ye).
s), a connection request signal is transmitted at that radio frequency (ST
3). This connection request signal is continuously transmitted at least for a time period in which the frequency of all the radio frequencies usable by the called radio 2 can be switched and the signal search for the connection request signal can be performed (ST4).

On the other hand, in the called radio 2, the frequency switching means 5c has a lower frequency depending on the reset signal generated when the power is turned on, irrespective of the frequency search of the vacant channel on the calling radio 1 side. The frequencies are sequentially switched from (first frequency) to select one radio frequency (ST
5). Then, the connection request signal at the radio frequency (sixth frequency in FIG. 7) selected by the calling radio 1 is searched based on the radio signal level (carrier level) at this radio frequency. When the connection request signal is detected and received by the receiving means 6b of the wireless unit 6 (ST
6-Yes), in order to send the connection response signal to the calling wireless device 1, the process shifts to the timing waiting state shown in any of FIGS. 4 to 6 (ST7). Then, the connection response signal to the connection request signal is transmitted at any of the timings of FIGS. 4 to 6 (ST8).

In the example shown in FIG. 4, the stop of the connection request signal transmitted from the calling wireless device 1 is detected, and the connection response signal is transmitted via the wireless section 6 at the detection timing.

In the example shown in FIG. 5, the connection response signal is sent out via the radio section 6 at the detection timing of the stop signal added to the end of the connection request signal.

In the example shown in FIG. 6, the connection response signal is transmitted via the radio section 6 based on the timing information for transmitting / receiving the response signal added to the connection request signal.

As a result, when the calling radio 1 receives the connection response signal to the connection request signal from the called radio 2 via the receiving means 4b of the radio unit 4 (ST9-Yes), the calling radio 1 is called. Data is alternately transmitted / received to / from the called radio 2 at one radio frequency (sixth frequency in FIG. 7) switched and selected by the frequency switching means 3c and 5c (ST10, 11).

By transmitting and receiving this data, data for operating the shovel car is transmitted and received from the calling radio device 1 to the called radio device 2, and the posture of the shovel car is controlled according to this data. .

Further, from the called radio 2 to the calling radio 1, the sensor information of the shovel car is transmitted / received to / from the controller connected to the calling radio 1, and the sensor information is displayed on the display section of the terminal. Based on various displays.

In the example of FIG. 7, when transmitting the connection request signal from the calling wireless device 1, the continuous transmission time T of the connection request signal is continuously set to the spare time t. t may be omitted.

By the way, as shown in FIG. 9 and FIG. 10, the judgment means 5 is provided in the called radio 2 to add the operation of ST7-1, and the connection response signal is sent from the stopped state of the connection request signal. The reception level (carrier level) of the wireless signal from the wireless unit 6 is determined at a predetermined timing between the two, and if the level is high, another wireless device other than the calling wireless device sends a wireless signal at the same frequency. It is also possible to determine that there is interference and stop sending the connection response signal, avoid interference, and consider using another radio frequency.

Therefore, according to the above-described embodiment, one currently available radio frequency is automatically selected and connected from a plurality of radio frequencies, so that manual selection and connection of the radio frequency is troublesome. The unused radio frequency can be effectively used.

Since the calling wireless device 1 repeatedly transmits the connection request signal including the wireless device identification code, the called wireless device 2 for which the connection request is made may shift to the connection operation at the same time as receiving the signal. it can. In addition, the called wireless device 2 that has not been requested to connect can immediately shift to another connection request signal searching operation without being locked for a long time.

Since both the calling radio 1 and the called radio 2 transmit and receive signals at a predetermined timing,
The problem that both radios emit radio waves at the same time is eliminated, and the connection time can be optimized without waiting too long.

By the way, in the above embodiment, the one-wave transmission / reception wireless communication device comprising one calling radio 1 and one called radio 2 has been described. The base is set as the calling radio 1, and the remaining radios are called radios 2.
If so, the concept of the 1: 1 wireless communication system according to the above-described embodiment can be applied as it is. This gives N
It is possible to automatically perform the operations from wireless connection using one radio frequency using one wireless device to data transmission.

Further, referring to FIG. 11, when the calling radio 1 detects the radio frequency of the available empty channel as described above, all the N called parties that are data transmission partners at this radio frequency are called. Connection request signals are sent to the wireless devices 2 all at once. At this time, the connection request signal includes data that specifies the transmission order of connection response signals from the called wireless device 2 and the transmission order of transmission data after wireless connection.

The called wireless device 2 sequentially sends a connection response signal to the connection request signal from the calling wireless device 1 in succession without interruption in accordance with the data designating the sending order in order from the wireless device number 1. To do. And radio number N
When a connection response signal is sent from each of the called wireless devices 2 of N, all N called wireless devices 2 are continuously connected without any time interruption.
Data is transmitted to the calling wireless device 1.

The transmission order of the connection response signal of each called radio 2 in response to the connection request signal from the calling radio 1 and the transmission order of the data after the wireless connection are ascending / descending order of the radio number (see FIG. 1).
In the example of No. 1, it is not limited to the order of the wireless device number from the smallest to the largest), but may be random, and can be arbitrarily set by the setting means 3a of the calling wireless device 1.

By the way, in the above-described embodiment, the calling wireless device 1 receives the connection response signal in response to the connection request signal.
Although the state of the wireless connection between the called wireless device 2 and the called wireless device 2 is checked, as shown in FIG. 12, it is checked whether the wireless connection between the calling wireless device 1 and the called wireless device 2 has been made. A configuration may be adopted in which a connection confirmation signal for confirmation is separately added and transmitted / received.

The connection confirmation signal is set by the setting means 3a of the calling wireless device 1 so as to be transmitted to the called wireless device 2 which has received the connection response signal to the connection request signal. When the called wireless device 2 receives the connection confirmation signal from the calling wireless device 1, the called wireless device 2 transmits a response connection confirmation signal to the calling wireless device 1. Thereby, the strictness of the connection confirmation between the calling wireless device 1 and the called wireless device 2 can be further increased.

In the one-wave transmission / reception wireless communication device composed of one calling radio 1 and a plurality of called radios 2 described above, data input / output of the control unit 5 of each called radio 2 is performed. Specific code adding means (broken line part in FIG. 9) on the input side of the means 5a
7, a specific code for avoiding interference with data (for example, sensor information of the controlled object) input from the controlled object and specifying a called wireless device as a communication partner that transmits the data, for example, a wireless device A configuration in which data in which a number is encoded may be added may be used.

As a result, data can be transmitted between the called radios 2 in the order designated by the specific code without passing through the calling radio 1. For example, in the example shown in FIG. 11, data is transmitted from the called radio 2 having the radio number 1 to the called radio 2 having the next radio number in order and without interruption to the last called radio 2. Data is transmitted and received between the called radios 2 and 2 by one radio frequency. At this time, the calling radio 1 constantly monitors the state of each called radio 2 by receiving a radio signal at one selected radio frequency.

The order of data transmission from the called wireless device 2 to the called wireless device 2 is not limited to the ascending / descending order of the wireless device number and may be random, and may be arbitrarily determined by a specific code added to the input data. Can be set.

By the way, the one-wave transmission / reception wireless communication device having the above-mentioned structure is used for remote control of construction machines such as excavators and construction vehicles such as aerial work vehicles and cranes.
The present invention can be applied to various fields in which remote control by radio can be performed, such as on-line classification of food weights flowing on a conveyer conveyor by weight and opening / closing control based on water level data of dams.

[0076]

As described above, according to the one-wave transmission / reception wireless communication system and apparatus of the present invention, one radio frequency currently available from a plurality of radio frequencies is automatically selected and connected. Therefore, the trouble of manual selection and connection of radio frequencies is eliminated, and unused radio frequencies can be effectively used.

Further, since the calling wireless device repeatedly transmits the connection request signal including the wireless device identification code, the called wireless device requested to connect may shift to the connection operation at the same time as receiving the signal. it can. Moreover, the called wireless device that has not been requested to connect can immediately shift to another connection request signal search operation without being locked for a long time.

Furthermore, since both the calling radio and the called radio transmit and receive signals at a predetermined timing, the problem that both radios emit radio waves at the same time is eliminated, and more than necessary. The connection time can be optimized without waiting time.

According to the one-wave transmission / reception wireless communication system of claims 5 to 7, the connection response signal can be transmitted from the called wireless device at the timing when the calling wireless device shifts to the search operation of the connection response signal. it can. Further, in particular, according to the one-wave transmission / reception wireless communication system of claim 7, it is not necessary to receive the connection request signal on the way, so that the connection error due to the reception error can be reduced.

According to the one-wave transmission / reception wireless communication system of claim 8, since each called wireless device adds the code for identifying the called wireless device of the transmission destination after the wireless connection and sends the data, Data can be transmitted between the called radios without going through the calling radio.

[Brief description of drawings]

FIG. 1 is a block configuration diagram of a one-wave transmission / reception wireless communication device according to the present invention.

FIG. 2 is a frame configuration diagram of a connection request signal transmitted from a calling radio of the same device.

FIG. 3 is a diagram showing a relationship between a connection request signal transmitted from a calling radio of the same apparatus and a search time of a connection request signal from a called radio.

FIG. 4 is a diagram showing how to determine the timing when the called radio sends a connection response signal to the calling radio in the same apparatus.

FIG. 5 is a diagram showing how to determine the timing when the called radio transmits a connection response signal to the calling radio in the same apparatus.

FIG. 6 is a diagram showing how to determine the timing when the called radio transmits a connection response signal to the calling radio in the same apparatus.

FIG. 7 is a timing chart showing an example of a communication operation when data is transmitted between a calling radio and a called radio of the same device.

FIG. 8 is a flow chart diagram of a communication operation when data is transmitted between a calling radio device and a called radio device in the same apparatus.

FIG. 9 is a block configuration diagram of another embodiment of the one-wave transmission / reception wireless communication device of the present invention.

FIG. 10 is a flow chart diagram of a communication operation when data is transmitted between a calling radio device and a called radio device in the apparatus of FIG.

FIG. 11 is a timing chart showing an example of a communication operation when data is transmitted between one calling radio and a plurality of called radios in the same device.

FIG. 12 is a diagram showing a communication operation when a connection confirmation signal is added in the same device.

FIG. 13 is a timing chart of communication operation by the fixed channel method.

FIG. 14 is a timing chart of communication operation by a dedicated control channel system.

[Explanation of Codes] 1 ... Calling radio, 2 ... Called radio, 3, 5 ... Control unit,
4, 6 ... Wireless unit, 3a ... Setting means, 3b ... Data input / output means, 3c ... Frequency switching means, 3d ... Judging means, 3e ...
Signal sending means, 3f ... Identification means, 4a ... Sending means, 4b
... switching means, 4c ... receiving means, 5a ... data input / output means, 5b ... frequency switching means, 5c ... identifying means, 5d ... response signal sending means, 5e ... judging means, 6a ... transmitting means, 6
b ... switching means, 6c ... receiving means.

Claims (8)

[Claims] 1. Transmission and reception of data by wireless connection between one calling radio (1) and one called radio (2) by one radio frequency available from a plurality of radio frequencies. In the one-wave transmission / reception wireless communication system for performing the above, the calling radio sequentially searches for one available frequency by sequentially switching the plurality of radio frequencies, and uses one radio frequency determined to be available in this search. , A connection request signal including a radio-specific code designating a called radio as a communication partner is continuously and repeatedly transmitted for a time sufficient for the called radio to switch all radio frequencies and search for a frequency. However, after stopping the transmission of the connection request signal, the response of the called wireless device is confirmed by searching and identifying the connection response signal sent back from the called wireless device at the radio frequency. , The called radio , The connection request signal from the calling radio is searched while sequentially switching the plurality of radio frequencies, and when the connection request signal from the calling radio can be received and identified, the calling radio is The connection response signal is transmitted at the same frequency in synchronization with the timing of the search operation for the connection response signal, and the same frequency selected by the search operation for the frequencies of the calling radio and the called radio is used. 1 is characterized in that the calling radio and the called radio are wirelessly connected by one radio frequency to alternately transmit and receive data.
Wave transmission / reception wireless communication system. 2. A data connection is made by sequentially wirelessly connecting one calling radio (1) and a plurality of called radios (2) by one radio frequency available from a plurality of radio frequencies. In the one-wave transmission / reception wireless communication system that performs transmission / reception, the calling wireless device sequentially switches the plurality of wireless frequencies to search for an available frequency, and according to one wireless frequency determined to be available in this search, Sufficient time for all the called radios to switch by a predetermined radio frequency and search for a connection request signal including a code specifying all the called radios and designation information of the response order of the called radios. Continuously repeatedly sending, after stopping the sending of the connection request signal, by searching and identifying the connection response signal sent back in the specified order from each of the called radios at the radio frequency Of the called radio Confirming the response, each of the called radio searches for a connection request signal from the calling radio while sequentially switching the plurality of radio frequencies, and a connection request signal from the calling radio is received. When receiving and identifying, the calling radio transmits the connection response signal in the order specified by the connection request signal at the same frequency in synchronization with the timing of moving to the connection response signal searching operation. Designation by the connection request signal between the calling radio and each called radio by one radio frequency based on the same frequency that is selected by the search operation of the respective frequencies of the calling radio and each called radio A one-wave transmission / reception wireless communication method characterized by performing wireless connection according to an order and transmitting / receiving data alternately. 3. Transmission and reception of data by wireless connection between one calling radio (1) and one called radio (2) by one radio frequency available from a plurality of radio frequencies. In the one-wave transmission / reception wireless communication device that performs the above, the calling wireless device includes a frequency switching unit (3c) that sequentially switches the plurality of wireless frequencies to select one frequency,
A determination means (3d) for determining whether or not one radio frequency switched and selected by the frequency switching means is available, and a connection request signal including a radio device specific code for designating a called radio device as a communication partner. Signal transmitting means (3e) for continuously and repeatedly transmitting for a sufficient time for the called radio to switch all radio frequencies and search for frequencies, and from the called radio in response to the connection request signal. Identification means (3f) for identifying the quality of the connection response signal sent back, and one radio which is determined to be usable by the determination means when the response from the called radio can be confirmed by the identification means. A receiver / transmitter (4) for wirelessly connecting to and receiving data from the called wireless device according to a frequency, and the called wireless device sequentially switches the plurality of wireless frequencies to set one frequency. Select Frequency switching means (5b)
Identification means (5c) for identifying the presence or absence of a connection request signal from the calling radio at one radio frequency switched and selected by the frequency switching means, and a connection request signal from the calling radio by the identification means Signal sending means (5d) for sending a connection response signal corresponding to the connection request signal in time with the calling radio when it is identified that there is
And, when the identifying means identifies that there is a connection request signal from the calling radio, establishes a wireless connection with the calling radio using the same one radio frequency as the calling radio. A one-wave transmission / reception wireless communication device, comprising: a transmission / reception means (6) for transmitting / receiving data. 4. A wireless connection is made between one calling radio (1) and a plurality of called radios (2) sequentially by one radio frequency available from a plurality of radio frequencies. In the one-wave transmission / reception wireless communication device that performs transmission / reception, the calling wireless device includes a frequency switching unit (3c) that sequentially switches the plurality of wireless frequencies to select one frequency,
A determination means (3d) for determining whether or not the radio frequency switched and selected by the frequency switching means is available, a code for identifying all the called radios as communication partners, and a response order of the called radios. A signal transmitting means (3) for continuously and repeatedly transmitting a connection request signal including designation information for a time sufficient for the called radio to switch all radio frequencies and search for frequencies.
e), an identification unit (3f) for identifying the quality of the connection response signal sent back from the called wireless device in response to the connection request signal, and one wireless unit determined to be available by the determination unit. A transmitting / receiving means (4) for wirelessly connecting to the called wireless device according to a frequency and transmitting / receiving data in the order specified by the connection request signal, and each of the called wireless devices is provided. , A frequency switching means (5b) for sequentially switching the plurality of radio frequencies to select one frequency, and the presence or absence of a connection request signal from the calling radio at one radio frequency switched and selected by the frequency switching means And an identification means (5c) for identifying the connection request signal from the calling radio when the identification means identifies the connection request signal from the calling radio. And a signal transmitting means (5d) for transmitting a connection response signal, and the same one radio frequency as that of the calling radio when the identifying means identifies that there is a connection request signal from the calling radio. A one-wave transmission / reception wireless communication device, comprising: a transmission / reception unit (6) that wirelessly connects to the calling wireless device and transmits / receives data in the order specified by the connection request signal. 5. The one-wave transmission / reception wireless communication system according to claim 1, wherein the connection response signal is transmitted at a timing when the stop of the connection request signal transmitted from the calling radio is detected. 6. The stop request signal is included at the end of the connection request signal sent from the calling radio, and the connection response signal is sent at the timing when the stop signal is detected. One wave transmission / reception wireless communication system. 7. The connection request signal transmitted from the calling radio device includes timing information for transmitting the connection response signal, and the connection response signal is transmitted based on the timing information. The one-wave transmission / reception wireless communication system according to Item 1. 8. The one-wave transmission / reception wireless communication system according to claim 2, wherein each of the called wireless devices adds a code for identifying a called wireless device of a transmission destination after data is wirelessly connected and transmits the data.