JPH0728260B2 - Supervisory control device - Google Patents

Description

The present invention relates to a supervisory control device, and more particularly to a supervisory control device suitable for a TDMA (time division multiple access) communication line in satellite communication.

[Conventional technology]

Satellite communication has a wide communication area that can be covered by one artificial satellite and can use radio waves in a high frequency band, and is therefore widely used because it enables wideband (high speed) transmission. Further, satellite communication has advantages such as overcoming geographical obstacles, uniformity of communication quality, disaster resistance, broadcast communication and multiple access system.

The TDMA system is a system that controls the transmission timing of signal bursts sent from each earth station and adjusts the signals so that they do not overlap each other on a repeater (satellite). This method
Compared to other methods, there is an advantage that the line allocation to each earth station is more flexible and that satellite power can be effectively used because it is time division.

Since the TDMA communication line has flexibility in line allocation, conventionally, a method has been adopted in which a plurality of dependent stations are assigned a supervisory signal channel and a meeting telephone channel for each station. Was there.

[Problems to be Solved by the Invention]

In the above-mentioned conventional example, each subordinate station has two communication lines, so in order to cope with this, many channels must be prepared in the reference station.
There was an inconvenience.

[Object of the Invention]

An object of the present invention is to provide a supervisory control device that improves the disadvantages of the conventional example, and particularly simplifies the configuration of the reference station by reducing the communication lines between the reference station and a plurality of dependent stations. is there.

[Means for Solving the Problems]

The present invention is provided with a reference station and a plurality of subordinate stations, each of which is provided with a supervisory control unit and a switching unit which is controlled by the supervisory control unit and operates to switch the line mode to the telephone mode. Then, the reference station outputs a call signal including a transmitter control signal to each subordinate station as necessary, and then receives a monitor signal from the subordinate station, and a telephone from the subordinate station. When the usage request is received, immediately the switching means of the dependent station is controlled to switch the communication line to the telephone mode, and after the telephone is used, the monitoring control mode is switched back to the original mode.
It has the function of. This aims to achieve the above-mentioned object.

Example of Invention

An embodiment of the present invention will be described below with reference to FIGS.

In the embodiment shown in FIGS. 1 and 2, one reference station 1 and a plurality of dependent stations 2, 2, ... Are provided.

The reference station 1 includes a first monitoring controller 10 that controls the entire system,
A switching unit 11 as a switching unit that is controlled by the first monitoring control unit 10 to switch the used line to the telephone mode, a meeting telephone 12 connected to the switching unit 11, and an output stage of the switching unit 11. The transmitter / receiver 13 is provided.

Further, each of the plurality of subordinate stations 2, 2, ... Is operated by being controlled by the second monitoring control unit 20 and the second monitoring control unit 20 in the same manner as the reference station 1 described above. A configuration including a switching device 21 as switching means for switching the operation to a telephone mode, a meeting telephone 22 connected to the switching device 21, and a transceiver 23 connected to an output stage of the switching device 21 to the outside. Has become.

.. and the above-mentioned reference station 1 are connected by a one-channel communication line. Here, the symbols 1A, 2
Each A indicates a communication antenna. Therefore, the reference station 1
A channel shared by a plurality of subordinate stations 2, 2, ... constitutes a transmission line for a supervisory control signal and a meeting telephone signal.

Specifically, in this embodiment, the reference station 1 outputs a call signal including a transmitter control signal to each of the subordinate stations 2, 2, ... As necessary, and then outputs a monitoring signal from the subordinate station 2. The first function of receiving a call, and when receiving a telephone use request from the subordinate station 2, immediately controls the switch 21 of the subordinate station 2 to switch the communication line to the telephone mode and monitor the original after the use of the telephone. And a second function of switching to the control mode. And, as described above, in this system, each of the dependent stations 2, 2,
... uses a common channel, the transceiver 23 of the subordinate station 2 is operated by one station when necessary, and the transceivers 23 of the other subordinate stations 2 are controlled by the reference station 1 so as to stop.

The monitoring control operation is performed by the polling method, and the calling signal of the dependent station 2 output from the reference station 1 always includes the control signal of the transceiver 23.
And then send back the supervisory signal.

When using the meeting telephones 12 and 22, the telephone use request is set as one of the monitoring items in the base station 1, and if there is a display of the request, the base station 1 controls the switching device 21 to the corresponding subordinate station 2, and the meeting is held. After switching to the telephone 22, and after the meeting is over, the switching unit 21 of the subordinate station 2 is controlled from the reference station 1 again to switch to the monitoring control signal side and the monitoring control operation is returned to.

〔The invention's effect〕

As described above, according to the present invention, the transmission of the supervisory control signal and the consultation telephone signal between the reference station and the plurality of dependent stations in the TDMA communication line is configured by one common channel, so that the channel of the reference station is reduced and the dependent stations are transmitted. It is possible to realize commonality, which simplifies the configuration of the reference station, and greatly reduces the overall capital investment, etc. be able to.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is an overall explanatory view showing the relationship between a reference station and a dependent station including FIG. 1 ... Base station, 2 ... Subordinate station, 10 ... First monitoring control unit, 11, 21 ... Switching device, 12, 22 ... Meeting telephone, 20
...... Second monitoring control unit.

Claims (1)

[Claims] 1. A reference station and a plurality of subordinate stations, each of which is provided with a supervisory control unit and a switching unit which is controlled by the supervisory control unit and operates to switch a line mode to a telephone mode. A first function of outputting a call signal including a transmitter control signal to each of the dependent stations and then receiving a supervisory signal from the dependent station, and immediately receiving a telephone use request from the dependent station. Controlling the switching means of the dependent station to switch the communication line to the telephone mode and switching to the original monitoring control mode after the telephone is used.
And a monitoring control device having the function of.