JPH01231528A - Method and device for radio communication - Google Patents

Abstract

PURPOSE:To improve the adaptability to the change or extension of a route for a moving object, the change of the working efficiency, etc., and to reduce the cost of facilities by transmitting calls through each of 1st radio equipments and defining the 1st radio equipment that transmitted the call received by a 2nd radio equipment at first as the 1st radio equipment for communication. CONSTITUTION:The communication is secured between a fixed 1st terminal 10 and a moving 2nd terminal 20 via the 1st radio equipments R1-R3 connected to the terminal 10 and a 2nd radio equipment C1 connected to the terminal 20. In this case, a service area including a moving range of the terminal 20 and exceeding the radio zones r1-r3 of those 1st radio equipments is set by means of said 1st ratio equipments. When the communication is carried out to the terminal 20 from the terminal 10, the equipments R1-R3 transmit calls and the 1st radio equipment that transmitted a call received by the equipment C1 at first is defined as the 1st radio equipment for communication. Thus it is possible to reduce the cost of facilities and to improve the adaptability to the change or extension of the route for a moving object, the change of the working frequency, etc.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a wireless communication technology between a fixed terminal and a mobile terminal, and in particular, to communication technology that uses wireless communication beyond the focal line zone of a single fixed wireless station. The present invention relates to wireless communication technology that secures communication with moving mobile radio stations.

[Prior art]

For example, when automatically controlling an overhead crane that moves within a large warehouse or factory such as a steel mill, it is necessary to ensure communication between a ground terminal installed in an operation room or the like and an on-board terminal installed on the overhead crane.

Wireless communication is an effective method for ensuring communication between fixed terminals and mobile terminals, but the movement range of the mobile terminal does not necessarily fall within the wireless zone of the wireless device connected to the fixed terminal. Not necessarily. In this case, it is possible to expand the wireless zone by increasing the output of the wireless device, but there are various problems such as the influence on other devices, and this is rarely allowed.

Therefore, in the past, guided radio systems have often been adopted as a means to ensure this type of communication. To explain this in the case of the above-mentioned overhead crane, it is a method in which leaky waveguides are laid along the rails of the overhead crane and a wireless device is installed on the overhead crane to ensure communication. According to this, since the leaky waveguide is installed extremely close to the wireless equipment on the overhead crane, the power required for wireless communication is extremely small, and there is almost no effect on other equipment. .

[Problems with conventional technology]

However, this conventional guided radio system requires construction work to install a leaky waveguide and a leakage waveguide, so there is a problem in that the cost required for the equipment and the cost required for its maintenance are extremely large.

In addition, for the same reason, updating or extending a leaky waveguide requires a large amount of cost, so it is difficult to easily change or extend the route of a mobile object such as a crane, or change the frequency used due to an increase in communication content. I can't.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a wireless communication technology that is highly adaptable to changing or extending the route of a mobile object, changing the frequency used, etc., and requiring low equipment costs.

[Structure of the invention]

In order to achieve the above object, in the present invention, communication between a fixed first terminal and a moving second terminal is carried out by a first wireless device connected to the first terminal and a second wireless device connected to the second terminal. When securing via a second wireless device, a plurality of first wireless devices are used to set a service area that includes the movement range of the second terminal that exceeds the wireless zone of a single first wireless device, and When transmitting from a terminal to a second terminal, a call is made from each first wireless device, and the first wireless device that made the call, which is first received by the second wireless device, is set as the first wireless device for communication, When transmitting from the second terminal to the first terminal, the first wireless device that first received the call from the second wireless device
When there is no communication between the first and second wireless devices, polling is performed between each first and second wireless device to determine the wireless zone where the second wireless device exists. shall be tracked.

[Effect]

According to this, since a plurality of first wireless devices are used to configure a service area that covers the movement range of a second terminal that exceeds the wireless zone of a single first wireless device, the cost required for equipment is small. It's over. In addition, the size or shape of the service area can be updated simply by changing the number or arrangement of the first wireless devices, so it is highly adaptable to changing or extending the route of a mobile object, or changing the frequency used. .

Furthermore, since the first wireless device that connects the system with the second wireless device is set upon completion of a call, there is no need to refer to the reception level, etc., which simplifies control.

By the way, the first wireless device and the second wireless device communicate by dividing the communication content into a plurality of parts in an interactive manner, and the remaining first wireless devices excluding the first wireless device for communication are placed on standby. When the interaction between the first wireless device for communication and the second wireless device is interrupted, the first wireless device for standby that is receiving the signal from the second wireless device is updated for communication. In this way, good communication can be ensured when the second terminal moves across the wireless zones of a plurality of first wireless devices. In this case as well, the control is extremely simple because no comparison of reception levels is performed, and since the first wireless device that is not involved in the communication is on standby, there is no possibility that communication will be interrupted due to switching of wireless zones.

Other objects and features of the present invention will become apparent from the following description of embodiments with reference to the drawings.

[Embodiment] FIG. 1 shows the configuration of an overhead crane control system implementing the present invention as an example.

In FIG. 1, 1 is a factory building, which is equipped with an overhead crane 2 that reciprocates in the longitudinal direction. The control room of the factory building 1 is equipped with a ground control terminal 10 connected to a host computer (not shown), and there are wireless modems R1, R fixed at predetermined positions in the factory building 1.
, 2 and R3 are connected. These wireless modems
,], the radio zones of R2 and R3 are rl,
It is indicated by r2 or r3, and constitutes a service area that covers the entire area inside the factory building 1, allowing for overlap. The crane 2 is also equipped with an on-board control terminal 20, to which a wireless modem C1 fixed on the crane 2 is connected. These wireless modems R1, R2 or R3
The wireless modem C1 secures wireless communication between the ground control terminal 10 and the onboard control terminal 20 for transmitting and receiving data necessary for controlling the crane 2.

The hardware configuration of the embodiment device will be explained with reference to FIG.

As shown here, the ground control terminal 10 is centered on a microprocessor (hereinafter referred to as CPU) 11, and its path line includes a main memory 12, a timer and counter module 13. I/○ interface circuit (hereinafter simply referred to as I)
abbreviated as lo) 14-17, keyboard terminal KDI
, printer PTR, floppy disk FDI, hard disk HD1, etc. are connected. T1014 has wired modem M], wireless modem R1 is connected to a and Mlb, wireless modem R2 is connected to ■/○15, and T10
A wireless modem R3 is connected to T1017 via wired modem M3a and M3b, respectively.
A host computer (not shown) is connected via a wired modem MO.

The onboard control terminal 20 is centered on the CPU 2+, and its path line includes the main memory 22. Timer and counter module 23. Wireless Motem C] is connected ■102
4. Keyboard terminal KD2. Floppy disk FD2 and various actuators and 1 (not shown)
- Controlled elements including drivers etc. are connected.

As shown in Fig. 3, the software configuration of this embodiment device is as follows. lower-level transmission control, which performs control; wireless communication control, which performs transmission control in the radio section between the ground side and the aircraft side;
and local transmission control that performs transmission control for controlled elements onboard the aircraft. Furthermore, upper level transmission control is performed by the host I-
The lower transmission control consists of the upper route control that selects and analyzes the identification code between the computer and the upper data link control that manages the transmission procedure and order, etc. Lower-level route control that selects and analyzes identification codes, selects receiving modems, performs zone crossing, and zone tracking, etc., which will be described later;
and three lower data link controls that manage the transmission procedure and order, etc. Local transmission control is performed by wireless modem C
lower-level data link control that manages the transmission procedure and order, etc. of 1; and input that performs selection and analysis of identification codes, exchange of data, and conversion of input/output formats with controlled elements mounted on crane 2; Consists of output control. In addition, the logical device emulates commands from the host computer, or converts data formats 1 to 1 to be sent and received between the host computer and the computer, and in wireless communication control, the communication channel is set for each wireless modem. Performs selection, line connection and disconnection, error control, etc. The wireless modem used in this example has nine channels including one control channel, and wireless communication control uses a carrier sense method to select communication channels, and line connection and disconnection are performed using identification codes for each wireless modem. error control is performed using the ARQ method.

A specific example will be described with reference to the flowcharts shown in FIGS. 4a, 4b, and 4c.

First, please refer to Figure 4a. This flow shows each control operation when the power is turned on and when there is no communication, and the crane 2 is shown at P in FIG. position, i.e. the onboard wireless modem C
1 exists in the wireless zone of the terrestrial wireless modem R1.

When each of the wireless modems R1 to R3 and C1 is powered on, initial processing is performed to initialize input/output, buffer memory, etc. in each wireless communication control.

When the ground control terminal 10 is powered on, it performs transmission initial processing to set the initial state of transmission in lower route control. Here, the lower-level transmission program and constants are initialized, and the registered wireless modem R1
-Starts line connection processing for lower data link control corresponding to R3.

As a result, in lower data link control, the number of
- After instructing the corresponding wireless modems R1 to R3 to connect the line, the process is terminated upon receiving the response. In this manner, in this embodiment, signals are exchanged between different systems in an interactive manner.

When each wireless modem R1 to R3 is instructed to connect to a line, it registers its own station identification code and turns on the power of the wireless unit during wireless communication control, sets the communication channel to control channel C-CH, and sets the standby state. do.

Furthermore, when the power of the on-board control terminal 20 is turned on, in the lower data link control, a transmission initial process for initializing the transmission state and a registration process for registering tracking data are performed, and a reception waiting state is set. In this line connection process, the wireless model 1Xct is instructed to connect the line, and in the registration process, the tracking data including the identification code assigned to the onboard control terminal 20 and the partner station identification code are transferred to the wireless model C3 and registered. instruct.

In radio communication control, the radio modem C1 registers its own station identification code and turns on the radio unit in response to a line connection instruction, sets the communication channel to the control channel C-CH, and transfers in response to the registration instruction. The tracking data and partner station identification code are set in the buffer memory, and then the standby state is set.

On the other hand, in the lower route control of the ground control terminal 10, after performing the transmission initial processing, the activation of the zone tracking processing is set and the reception standby state is set. After waiting a sufficient time for the standby state to be set in the wireless communication control of C1, the zone tracking process is started. In the zone tracking process, first, the wireless modem R1 is instructed to execute a polling process. As a result, the radio modem R1 executes polling processing in radio communication control, and the radio modem C1
Check the presence or absence of communication data, etc. In response, the wireless modem C1 transmits the tracking data set in the buffer memory to the wireless modem R1 via the control channel C-CH, so the wireless modem R1 receives this and uses the data for ground control. It is transferred to the lower route control system of the terminal 10.

This zone 1 racking process is performed by timer management at m second intervals when there is no communication. During this time, if the crane 2 moves and the wireless zone where the wireless modem C1 exists changes, polling by the wireless modem R1 becomes impossible.
The other radio modems R2 and R3 are instructed to execute the polling process in turn, and at that time, the radio modem is switched to the one that is receiving the tracking data from the radio modem C1. In this way, in the lower route control of the ground control terminal 10, the wireless zone where the wireless modem C1 exists, that is, the position of the crane 2 is racked to 1.

FIG. 4b shows a case in which the crane 2 moves from position Po to position R2 in FIG. Each control operation when moving from the R1 wireless zone to the R2 wireless zone is shown.

When the host computer instructs the crane 2 to send data, the logic device of the ground control terminal 10 reads it, starts the sending process, and sends the data sent from the computer to the host 1 in the main memory 12 (see Figure 2). and starts the lower-level route control transmission request processing.

In the transmission request processing, line establishment processing is activated at predetermined time intervals in order from the lower data link control corresponding to the radio modem R1.

When the corresponding wireless modem is instructed to make a call in the line establishment process of each lower data link control, each wireless modem selects an available communication channel using the carrier sense method in the wireless communication control, and selects the control channel C-CH.
Make a call via , specify the selected communication channel, and set up reception on that channel.

On the aircraft side, the radio modem C1 is waiting on the control channel C-CH and switches to the communication channel specified by the first received call. In this case, crane 2 is P. Since the wireless modem is located at 19-R1, it switches to the communication channel D i -CH specified in the call. Therefore, after this, calls from radio modem R2 or R3 will no longer be received.

When the wireless modem C1 receives a call, the wireless communication control starts a line establishment process for lower data link control. Here, the radio modem C1 is instructed to respond to the call, and the radio modem C1 issues a response signal via the channel D i -CH.

The radio modem R1 receives the response signal from the radio modem C1 and notifies the lower data link control on the ground side of the communication channel D i -CH to be used. Lower data link control on the ground side confirms line establishment, stores communication status such as communication flag, wireless modem used, communication channel used, etc., starts lower route control's transmission wait request processing, and performs transmission processing. Execute.

In the lower route control, in the transmission wait request processing, the transmission wait processing of the lower data link control corresponding to the unused radio modems, that is, radio modems R2 and R3 is activated. As a result, in the lower data link control corresponding to radio modems R2 and R3, transmission data from the host computer is read from the main memory 12 (see Figure 2), transferred to each corresponding radio modem R2 or R3, and channel D i -CI- (). This instructs wireless modems R2 and R3 to convert the transmitted data into BCH codes (Random Error Correction Codes), convert the format into block format, store it in the buffer memory, and start communication. Set the channel to Di-CH and wait for transmission.

Thereafter, the radio modems R2 and R3 stand by in a transmission waiting state, and when they receive the transmission request signal from the radio modem C1, they start a partner station response reception process for lower route control.

Furthermore, in the lower data link control corresponding to the wireless modem R1, in the transmission process, the transmission data from the host computer is read from the main memory 12, and the wireless modem R1
and instruct it to be sent.

As a result, the wireless modem R1 transfers the transmitted data to B.
The data is converted into a CH code (random error correction code), converted into a block format, and stored in a buffer memory, and transmission using the hybrid ARQ method is started via the channel Di-CH for each plurality of blocks.

Here, communication using the hybrid ARQ method will be explained with reference to FIG. In FIG. 5, the left side shows a transmission data block on the transmitting side, and the right side shows a transmission request signal on the receiving side. The transmission data block consists of 8 blocks,
The transmission request signal is composed of a NAK (negative acknowledge) block number and a block No that is desired to be transmitted next.

First, in ■, from the sending side No. 9.1, 2, 3°4.
Transmit a transmit data block consisting of blocks 5, 6, 7 and 8. The receiving side receives this and performs error correction and error detection. At this time, if there is an error in blocks No., 3.5, and 6, then at
AK block No. 3.5 and 6. It also issues a transmission request signal containing block numbers 9.10, 11.12, and 13 that it wishes to transmit next. In response to this, the sending side answered No, 3.5, 6.9°10.11 in ■.
．． A transmission data block consisting of blocks No. 12 and No. 13 is transmitted, but an error occurs in the reception of No. 10 blocks on the receiving side. 15
．． Issue a transmission request signal including 16°17.18.19 and 20.

If the transmitting side cannot receive the transmission request signal issued from the receiving side, as shown in ■, it assumes that the previous transmitted data block was sent correctly and transmits the next transmitted data block. .

In this case, No. 16 is the final block, so No.
, I4, 15 and 1G blocks. Even if the receiving side correctly receives the transmission data block at this time, it has not yet received the block No. 10, so in ■, it NAKs the block No. 1.
0 and the block number you wish to transmit next, 171
18119.20, 21.22 and 23. In response to this, when the sending side sends a No. 10 block at ■, the receiving side was able to correctly receive up to the last block, so it sends an ACK at ■.
(acknowledge) signal and terminate data transmission.

During communication, crane 2 moves to position Pl in Figure 1 and
When the radio modem C1 on the aircraft moves out of the radio zone r1 of the radio modem R1 on the ground, the radio modem R1 can no longer receive the transmission request signal from the radio modem C1. In other words,
There is no response to the transmission data block sent from radio modem R1 to radio modem C1.

Hybrid ARQ is used for wireless communication control of wireless modem R1.
The communication status is monitored from the interaction between the transmitter and the receiver according to the method, and when a response to the N times of transmission of the transmission data block is not obtained, a transmission start request process of lower route control is activated.

In the lower route control transmission start request processing, the wireless modem R receiving the transmission request signal from the wireless modem C1 at that time
2 to start transmitting, and the wireless modem R1
Activates the transmission waiting process of the lower data link control corresponding to .

As a result, wireless modem R2 immediately switches to wireless modem C1.
Since the transmission data block corresponding to the transmission request signal from the zone is transmitted, smooth zone crossing is completed without interrupting communication.

Thereafter, when the wireless modem C1 successfully receives the transmission data from the host computer up to the last block, it issues an ACK signal to the wireless modem R2, converts the format of the received data, and transfers it to the onboard control terminal 20. When the radio modem R2 receives the ACK signal from the radio modem CI, it terminates communication, sets a standby state using the control channel C-CH, and starts post-transmission processing for lower data link control. In this post-transmission process, the buffer memory of the wireless modem R2 is cleared, and the transmission completion process of lower route control is started.

In lower route control, wireless modem R1 is
Then, the lower data link control transmission wait release process corresponding to R3 is activated. As a result, in the lower data link control corresponding to the radio modems R1 and R3, each corresponding radio modem R1 or R3 is instructed to cancel the transmission standby. As a result, the wireless modems R1 and R3 clear their buffer memories, cancel the transmission wait state, and set the standby state using the control channel C-CI-f.

On the other hand, the on-board control terminal 20 confirms that the transmission data from the host combicoater has been normally received in the reception process of the lower data link control, and instructs the radio modem C1 to terminate the communication, and also controls the lower data link. The data stored in the buffer memory of the main memory 22 (second
(see figure) and starts the input/output control reception process.

In the input/output control reception processing, data format conversion, control of the corresponding controlled terminal, etc. are performed. Also,
The wireless modem C1 then transfers the communication channel to the control channel C-CH and terminates the communication by setting the standby state.After that, in the lower route control, the timer management performs the above-mentioned operations. The zone tracking process is started every m seconds.

FIG. 4c shows the structure of the onboard control terminal 20 - the control terminal 10
If crane 2 moves from position Po to position R2 in Figure 1 while transmitting data to
Each control operation is shown when the wireless modem R1 moves from the wireless zone of the terrestrial wireless modem R1 to the wireless zone of R2.

When transmission from the controlled terminal to the host computer is instructed, the data transmitted from the controlled terminal is stored in the main memory 22 (see Figure 2) during the input/output control of the onboard control terminal 2o, and the lower data link control is performed. Start line establishment processing.

In this line establishment process, the on-board wireless modem C1 is instructed to make a call, so the wireless modem C1 selects an available communication channel using the carrier sense method in wireless communication control and uses the control channel C-CH. make a call, specify the selected communication channel, and set up a reception standby on that channel. On the second side, the wireless modem R
] ~ R3 is waiting on the control channel C-CH, and the wireless mode j1 that received the call issued from the wireless mode As C] switches to the communication channel specified by the call in the wireless communication control, and performs the lower path control Start the first-come-first-served reception process,
Notify the communication channel used. Here, crane 2
is P. Since it is located at , the call from wireless modem C1,
The radio modem R1 receives the call and starts a first-come-first-served reception process for lower route control to switch to the communication channel Dj-CH specified in the call. In the first-come-first-served reception process, only the wireless modem that is the activation source starts the line establishment process for the corresponding lower data link control, and also sets the communication flag.

Stores communication status such as wireless modem used and communication channel used. In this case, a line establishment process for lower data link control corresponding to the radio modem R1 is activated. After this, in the lower route control, a reception wait request process is performed, and the reception wait process of the lower data link control corresponding to the wireless modeno 1 that is not used by specifying the communication channel D j -CH, that is, the wireless models 1XR2 and R3 is performed. to start. As a result, radio modems R2 and R3 set the communication channel to Dj-CI-1 and wait for reception.

Thereafter, the radio modems R2 and R3 stand by in a reception waiting state, and when they receive the transmission data block from the radio modem C1, they start the partner station response reception process for lower path control.

In the line establishment process performed by the lower data link control on the ground side, the radio modem R1 is instructed to respond to the call, so the radio modem R1 issues a response signal via the channel Dj-CH.

Radio modem C1 receives this response signal from radio modem R1, and the line is established.

In the line establishment process performed by the lower data link control on the aircraft side, when the establishment of the line is confirmed, the transmission process is executed, the transmission data is read from the main memory 22, and the wireless modem C
1 and instruct transmission. This allows wireless modem C
In 1, transmit data is stored in a buffer memory,
Transmission using the hybrid ARQ method is started via channel Dj-CH in the same manner as above.

During communication, crane 2 moves to position Pl in Figure 1,
When the radio modem CI on the aircraft moves out of the radio zone r1 of the radio modem R1 on the ground, the radio modem R1 becomes unable to receive the transmitted data block from the radio modem C1. In other words, there is no response to the transmission request signal sent from radio modem R1 to radio modem C1.

Hybrid ARQ is used for wireless communication control of wireless modem R1.
The communication status is monitored from the interaction between the transmitter and the receiver according to the method, and when a response to the transmission of the transmission request signal N times is not obtained, the reception start request processing of the lower route control is started, and the reception completion block number is notified. The format of the normally received block data is converted and the abnormally received block data is replaced with the initial value) and transferred to the ground control terminal 10.

In the lower data link control reception process corresponding to the radio modem R1 of the ground control terminal 10, data other than the initial value among the data stored in the lower data link control buffer memory is stored in the main memory 12 (see Figure 2). Store.

In the lower path control reception start request process, the wireless modem R2, which is receiving the transmission data block from the wireless modem CI at that time, is notified of the reception completion block No. Activates the reception waiting process for lower data link control corresponding to .

As a result, the wireless modem R2 immediately starts reception, and smooth zone crossing is completed without interrupting communication.

After this, when the wireless modem R2 successfully receives the transmitted data from the onboard control terminal 20 up to the last block, it issues an ACK signal to the wireless modem C1, and also converts the format of the normally received block data and does not receive it correctly. The block data is replaced with the initial value) and transferred to the ground control terminal 10. When the wireless modem C1 receives the ACK signal from the wireless modem R2, it terminates the communication and sets the standby state using the control channel C-CH.
Starts post-transmission processing for lower data link control. In this post-transmission process, the buffer memory of the wireless modem C1 is cleared, etc.

On the other hand, in the ground control terminal 10, the onboard control terminal 2
After confirming that the transmitted data from 0 has been successfully received, the wireless modem R2 is instructed to terminate the communication, and data other than the initial values among the data stored in the buffer memory for lower data link control is transferred to the main memory 12. (See Figure 2). Also, at this time, the reception completion process of the lower path control is started, and the reception process of the logical device is started.

In the lower route control reception completion process, the lower data link control reception wait release process corresponding to radio modems R1 and R3 is started, and the reception wait state of radio modems R1 and R3 is canceled, and the wait state on the 2nd control channel C-CH is started. Set the reception status. On the other hand, the logical device converts the format of the received data and transmits it to the host computer in this reception process. Furthermore, the wireless modem R2 then changes the communication channel to the control channel C-C.
I-( to set the standby state.

After the communication is terminated, the above-mentioned zone tracking process is started every m seconds by timer management in the lower route control.

Note that in this embodiment, there is one terminal on the mobile side, but if there is a plurality of terminals on the mobile side, the same control as described above may be performed for each terminal.

〔Effect of the invention〕

As explained above, according to the present invention, a plurality of first wireless devices are used to configure a service area that includes a movement range of a second terminal that exceeds the wireless zone of a single first wireless device. The cost required for this is small. Also, the first
Since the size or shape of the service area can be updated simply by changing the number or arrangement of wireless devices, it is highly adaptable to changing or extending the route of a mobile object, or changing the frequency used.

Furthermore, since the first wireless device that connects the system with the second wireless device is set upon completion of a call, there is no need to refer to the reception level, etc., which simplifies control.

In addition, as explained in the embodiment, the communication content is divided into a plurality of parts in an interactive manner between the first radio device and the second radio device, and the remaining content is divided into a plurality of parts, excluding the first radio device for communication. When the communication between the first wireless device for communication and the second wireless device is interrupted, the first wireless device on standby that is receiving the signal from the second wireless device is placed on standby. If the update setting is made for communication, even when the second terminal moves across the wireless zones of a plurality of first wireless devices, it is possible to ensure good communication with virtually no interruptions.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the configuration of an overhead crane control system implementing the present invention as an example, FIG. 2 is a block diagram showing the bar 1-ware configuration, and FIG. 3 is a block diagram showing the software configuration. . FIGS. 4a, 4b, and 4c are flowcharts showing control in data transmission. FIG. 5 is an explanatory diagram for explaining communication using the hybrid ARQ method performed in a wireless section. 1: Factory building 2: Overhead crane 10: Ground control terminal (first terminal) 11.21: Microprocessor 11: (control means) +2, 22: Main memory 1
3.23: Timer & counter module 14 to 1.7
, 24: I10 interface circuit 20: Onboard control terminal (second terminal) R1, R2, R3, C1: Radio modem R1, R2, R3: (first radio device) C1: (second radio device) MO, Mla , Old, M3a, M3b: Old wired modem, KB2: Keyboard terminal PTR: Printer HDI Hard disk FDI, FD2
: Floppy Tisf patent applicant Nippon Steel Corporation

Claims (14)

[Claims] (1) Ensuring communication between a fixed first terminal and a moving second terminal via a first wireless device connected to the first terminal and a second wireless device connected to the second terminal In a wireless communication method in which a plurality of first wireless devices are used to set a service area that includes a movement range of a second terminal that exceeds the wireless zone of a single first wireless device: from the first terminal to the second terminal. When sending a call to, each first wireless device makes a call, and the first wireless device that made the call, which is first received by the second wireless device, is set as the first wireless device for communication. Wireless communication method. (2) The transmission from the first terminal to the second terminal is performed by dividing the transmission content into a plurality of parts through interaction between the first wireless device and the second wireless device, as claimed in claim (1) above. Wireless communication method described. (3) At the time of transmission from the first terminal to the second terminal, the first wireless device that made the call made the call from each first wireless device and was first received by the second wireless device. When at least one of the remaining first wireless devices is set as a standby first wireless device in the device, and thereafter, the interaction between the first wireless device and the second wireless device for communication is interrupted; The first wireless device on standby receiving the signal from the second wireless device is updated and set for communication.
The wireless communication method described in section 2). (4) Ensuring communication between a fixed first terminal and a moving second terminal via a first wireless device connected to the first terminal and a second wireless device connected to the second terminal In a wireless communication method in which a plurality of first wireless devices are used to set a service area that includes a movement range of a second terminal that exceeds the wireless zone of a single first wireless device: from the second terminal to the first terminal. 1. A wireless communication method, characterized in that when transmitting a call to a second wireless device, a first wireless device that first receives a call from a second wireless device is set as a first wireless device for communication. (5) At the time of transmission from the second terminal to the first terminal, the first wireless device that first received the call from the second wireless device sends at least one of the remaining first wireless devices to the first wireless device for communication. Set one as the standby first wireless device, and then
When the first wireless device for communication stops receiving a signal from the second wireless device, the first wireless device for standby that is receiving the signal at that time is updated and set for communication. The wireless communication method described in paragraph (4). (6) The transmission from the second terminal to the first terminal is performed by dividing the transmission content into a plurality of parts through interaction between the second wireless device and the first wireless device, claim (5) above. Wireless communication method described. (7) Ensuring communication between a fixed first terminal and a moving second terminal via a first wireless device connected to the first terminal and a second wireless device connected to the second terminal In a wireless communication method in which a plurality of first wireless devices are used to set a service area that includes a movement range of a second terminal that exceeds a wireless zone of a single first wireless device, the first terminal and the second terminal include: 1. A wireless communication method, characterized in that when there is no communication between the first wireless device and the second wireless device, polling is performed between each first wireless device and the second wireless device to track the wireless zone in which the second wireless device exists. (8) A fixed first terminal; a plurality of first wireless devices connected to the first terminal; beyond the wireless zone of each first wireless device;
A wireless communication device comprising: a second terminal moving within a service area formed by a composite wireless zone of all first wireless devices; and a second wireless device connected to the second terminal for communicating with the first wireless device. : When transmitting from the first terminal to the second terminal, the first radio device that issued the call, which was first received by the second radio device, instructs each first radio device to make a call, and the first radio for communication A wireless communication device characterized by comprising a control means for setting the device. (9) The first wireless device divides the transmission content of the first terminal into multiple parts and transmits them, and the second wireless device sends a signal indicating the reception status each time it receives each divided signal from the first wireless device. emits,
The wireless communication device according to claim (8), wherein the first wireless device receives the signal and transmits a signal classified according to the received signal. (10) At the time of transmission from the first terminal to the second terminal, the control means instructs each first wireless device to make a call, and selects the first wireless device that made the call that was first received by the second wireless device. Set at least one of the remaining first wireless devices as a first wireless device for communication and a first wireless device for standby, and then,
When the first wireless device for communication no longer receives a signal indicating the reception status from the second wireless device, the first wireless device for standby that is receiving the signal indicating the reception status at that time is updated for communication. The wireless communication device according to claim (9). (11) Fixed first terminal; multiple first wireless devices connected to the first terminal; beyond the wireless zone of each first wireless device and within the service area consisting of the combined wireless zone of all first wireless devices. In a wireless communication device comprising: a moving second terminal; and a second wireless device connected to the second terminal for communicating with the first wireless device; characterized by comprising a control means for setting a first wireless device that first receives a call from the wireless device as a first wireless device for communication;
Wireless communication device. (12) At the time of transmission from the second terminal to the first terminal, the control means transmits the call from the second wireless device to the first wireless device for communication to the remaining first wireless device. At least one of the wireless devices is set as a first wireless device for standby, and then when the first wireless device for communication stops receiving a signal from the second wireless device, the signal is received at that time. updating and setting the standby first wireless device for communication;
A wireless communication device according to claim (11). (13) The second wireless device divides the transmission content of the second terminal into multiple parts and transmits them, and the first wireless device sends a signal indicating the reception status each time it receives each divided signal from the second wireless device. The wireless communication device according to claim 12, wherein the second wireless device receives the signal and transmits a signal classified according to the received signal. (14) Fixed first terminal; multiple first wireless devices connected to the first terminal; beyond the wireless zone of each first wireless device and within the service area consisting of the combined wireless zone of all first wireless devices. In a wireless communication device comprising: a moving second terminal; and a second wireless device connected to the second terminal for communicating with the first wireless device; there is no communication between the first terminal and the second terminal; 1. A wireless communication device, comprising: control means for instructing each first wireless device to perform polling with a second wireless device and tracking a wireless zone in which the second wireless device exists.