JPS6347017B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a signal collection method in which a central device collects signals transmitted from a plurality of terminal devices using a single wireless line. The present invention relates to a signal collection method that can be applied when a response request signal is sent out in order to know the status of a terminal device, and each terminal device then returns a response signal.

Conventional methods of this type include boring, in which a central device sequentially requests a response to all terminal devices at a fixed period, and boring, in which a response request is made once to all terminal devices, and each terminal device is individually requested. There is a known method in which the timing of the response is set and each terminal sequentially returns a response at regular intervals from the time of the response request.

However, according to the former Boring, when a central device performs normal communication with a terminal,
This communication becomes an obstacle and bowling becomes impossible. In addition, bowling takes time because the central device and a certain terminal device perform "response requests and responses" sequentially.

In addition, although the latter method improves the drawbacks of boring, it requires that a large number of terminal devices have their own delay times when designing the system, which not only makes the design difficult but also makes it difficult to construct and maintain the system. There are many problems. Furthermore, each terminal device has its own delay time, making the system fixed.

The present invention has been made in consideration of such circumstances, and aims to provide a method that can shorten signal acquisition time. Yet another objective is to allow normal communication from the central device to the terminal devices even during signal collection. Furthermore, another purpose is to provide a method that allows easy system design and easy system construction and maintenance.

The present invention will be described below with reference to the drawings. 1st
The figure is a block diagram of a disaster prevention administrative radio system, which is an example to which this method is applied. In the figure, 1 is a control station. This control station 1 is connected to a branch station 3 via a relay station 2 or directly. This connection is made by multiple radio lines 4. The branch station 3 has multiple terminal stations (No. 1, No. 2, ..., No. n) 5.
are connected by a single radio line 6. Of course, the number of terminal stations differs for each branch station.

In such a disaster prevention administrative radio system, the control station 1 is located at the prefectural office, the branch stations 3 are located at the joint government building, and the terminal stations 5 are located at the municipalities and local agencies.

The transmission speed of the system configured as described above is usually 50 to 200 BPS on the multiplexed wireless line 4, but on the other hand, the quality of the single wireless line is inferior to that of the multiplexed wireless line 4, and the wireless transmitter of the terminal station 5 is Added to each startup time, this slows it down considerably. Therefore, if the signal collection method in this single radio link 6 is improved, the overall transmission speed will be increased. Therefore, it is the most suitable system to which the present invention is applied.

The present invention will be explained in this example by assuming that the branch station 3 is the central device and the terminal station 5 is the terminal device. Further, in such a system, the branch station 3 and the terminal station 5 have an individual call function by automatic dial connection. Therefore, in order to implement the present invention, there is no need to add a special individual signal sending function. Furthermore, the single radio line 6 is duplex.

Next, the method of the present invention will be explained with reference to the timing chart of FIG. In the figure, A indicates the button operation from the control station, B indicates the signal from the control station to the branch station, C indicates the signal from the branch station to the terminal station, and D indicates No. 1.
E indicates a signal from the terminal station to the branch station, E indicates a signal from the No. 2 terminal station to the branch station, and F indicates a signal from the No. n terminal station to the branch station. Further, arrow a in the figure indicates when the operator is ready to respond.

Normally, the control station 1 performs the following operation in order to cause the branch station 3 to start operation. First, the control station 1 designates a command area (for example, all prefectures at once, designated branches all at once, etc.) by operating a button. As a result, the activation signal 7 is sent to the branch station 3 in the command area, and the branch station 3 starts operating.

Furthermore, the command type is designated (all prefectures all at once, branches all at once, branches/terminal stations all at once, all fire departments at once, etc.) from the control station 1 by operating a button. As a result, the command type signal 8 is sent from the control station 1 to the branch station 3 in operation. The branch station 3 determines whether it is necessary to communicate with the terminal station 5 based on the command type signal 8.

As a result, the present invention is applied when the branch station 3 has to communicate with the terminal station 5 under its jurisdiction. First, the branch station 3 sends a lock signal 9 and a command instruction signal 1.
0 to the terminal station 5, activates the terminal station 5,
Inform them that this is a simultaneous order. However, if it is not a simultaneous command, the command instruction signal 10 will not be issued.

Next, the branch station 3 sends a response request individual signal 11, which is an individual signal unique to each terminal station, to each terminal station 5 at the timing of (No. 1) to the terminal station (No. 1) 5.
It is sent to the terminal station (No. 2) 5 at the timing of (No. 2). The individual response request signals 11 are sent successively in a predetermined order as many times as there are terminal stations 5 in charge.

Response request individual signal (No.1, No.2,..., No.n) 1
1 is received by the terminal station 5, respectively. This results in
Each terminal station 5 receives a response signal (for example, 12 and 1 in the figure).
3) Get ready to send.

Here, in the terminal station 5, there are cases where the operator who operates the station is present and cases where there is no operator present. For example, assume that there are operators at the No. 1 terminal station 5 and No. n terminal station 5, and there is no operator at the No. 2 terminal station 5. As a result, since the operators at the No. 1 terminal station and No. n terminal station respond, the branch office
Response signals 12 and 13 are sent back to. In this example, the fixed time is set to t1.

However, since the operator at the No. 2 terminal station cannot respond, the terminal station t1 after receiving the No. 2 response request individual signal 11
In this case, the response signal 14 is not returned.

Next, the terminal station 5 returns a response signal at a period of a certain period of time (time t2 in this example) from the time when the first response signal should be returned.

In the embodiment, such response signals 15 and 16 are returned from terminal stations No. 1 and No. n. Also,
A handler now exists at the No. 2 terminal station and responds, and a response signal 17 is sent back. However, if the operator continues to be absent, this response signal 17
will not be returned.

The response signal sent back in this way is sent to the branch station 3.
Then, receive it and know the response status of each terminal station.

On the other hand, since the transmission from the branch station 3 to each terminal station 5 is terminated by the response request individual signal 11, other communications can be performed. That is, in this embodiment, a call service for preparation for a simultaneous command necessary for a simultaneous command is performed, and furthermore, a telephone call operation and a simultaneous command are performed at the discretion of the commander of the control station 1. After the simultaneous command is completed, the control station 1 performs a recovery operation. As a result, a disconnection signal 18 is sent from the control station 1 to the branch station 3, and a recovery signal 19 is sent from the branch station 3 to the terminal station 5.
will be sent. In this way, all stations return to normal.

Examples of the configuration of the branch station and terminal station used in the above embodiment are shown in FIGS. 3 and 4.

As shown in FIG. 3, the branch station 3 is composed of a multiline antenna 20, a multiplex radio device 21, a carrier end station device 22, a main frame switch 23, a control station trunk 24, and a terminal station trunk 25. a switchboard 26, a dedicated telephone 27, a control console 28 that controls outgoing calls and gives instructions to the terminal station in charge, a control and command rack 29 that controls outgoing calls and commands, a signal conversion device 30, a single radio device 31, a single It consists of a line antenna 32 and a facsimile 33 that performs general image communication and also receives simultaneous commands.

The control station 1 has the same configuration as the branch station, although the line size is larger.

As shown in FIG. 4, the terminal station 5 includes a main telephone 34 that receives simultaneous commands in addition to making general calls;
A loudspeaker 35 for simultaneous commands used when making the contents of a simultaneous command heard by a large number of people, a tape recorder 36 for simultaneous commands used to record the contents of a simultaneous command,
A facsimile 37 that performs general image communication and also receives simultaneous commands, a night telephone 38 that is switched to use at night, a slave telephone 39, a signal conversion device 40 that transmits and receives signals through a single radio line, and a single radio It is composed of a device 41 and an antenna 42.

The branch station 3 and the terminal station 5 operate as follows in the series of communications described above.

The signal from the control station 1 is sent to the exchange 26 in the branch station 3.
be taken in. For example, when a simultaneous command is issued, the exchange 26 connects the line on the control station side to the antenna 20.
->Multiple radio equipment 21 -> Carrier terminal equipment 22 -> Control station trunk 24 -> Control command rack 29 -> Control table 28, and displays that it is a simultaneous command. Also,
Antenna 20 → Multiplex radio equipment 21 → Carrier terminal equipment 2
2 -> control station trunk 24 -> control command rack 29 -> terminal station trunk 25 and start up the signal conversion device 30.

As a result, the lock signal, command instruction signal 10,
A response request individual signal 11 is sent to the terminal station 5.
In the terminal station 5, the signal conversion device 40 receives this and prepares to respond. The operator's response at the terminal station 5 is made by transmitting a signal from the signal conversion device 40 when the main telephone 34 goes off-hook. The response will be sent to the control station 2 at the branch station/control station.
8 is displayed.

As described above, the method of the present invention sequentially and continuously sends signals for signal collection to the terminal device, so that rapid collection can be performed. Specifically, since the time it takes to send out one individual response request signal shown in the embodiment is about 1 second when narrowband MF (multi-frequency) is used, this transmission usually ends in about 10 seconds.

Therefore, even when collecting response signals sent back from the terminal stations, communication from the central device to the terminal devices can be performed without any problems.

In addition, since each terminal device returns a response request to itself after a certain period of time depending on the operator's response, and repeats the return periodically after a certain period of time, all terminal devices can have the same specifications. Extremely efficient in system design, system construction, and maintenance.

Furthermore, since we periodically check the response status,
This is a highly reliable method.

In the application example of the present invention, a response request is issued to all terminal devices by a simultaneous command signal, but a response request may be issued only to a specific terminal device. Further, in the embodiment, a response request signal and a response signal are considered as the signals, but the present invention is not limited thereto. It goes without saying that this method can also be applied to relatively short data collections of the same length. In this case, the combination is a data request signal and a data signal.

Further, in the embodiment, the facsimile receives an image signal from a simultaneous command and draws information. In particular, the facsimile machines 33 and 37 have an automatic response function - that is, the equivalent of the operator's telephone response in the above example.
must be added. In this way, the response from the terminal device may be automated.

[Brief explanation of drawings]

FIG. 1 is a block diagram for explaining an example of a system to which the present invention is applied, FIG. 2 is a timing chart for explaining the system of the present invention, and FIG.
FIG. 4 is a block diagram of the configuration of a branch station in the system shown in FIG. 1, and FIG. 4 is a block diagram of the configuration of a terminal station in the system of FIG. 1...Control station, 3...Branch station, 5...Terminal station, 6
...Single radio line, 11...Response request individual signal,
12, 13, 14, 15, 16, 17...response signal.

Claims (1)

[Claims] 1 In a signal collection method in which signals transmitted from multiple terminal devices are collected by a central device using a single wireless line, individual signals unique to the terminal device are sent from the central device to each terminal device in a predetermined order. After receiving the respective individual signals, the terminal device generates a response signal after a certain period of time has elapsed and returns a response signal to the central device at regular intervals, and the central device A signal collection method characterized by receiving this returned response signal.