JPH08195706A - Satellite communication equipment - Google Patents

Abstract

PURPOSE: To continue communication by allowing a satellite communication slave equipment with lots of channels mounted thereto to select another communication channel for a common signaling channel transmission reception exclusive channel on the occurrence of a fault of the common control signal transmission reception exclusive channel. CONSTITUTION: A monitor changeover circuit 8 always monitors alarm signals 91 -9M respectively received from a common signaling channel(CSC) transmission reception exclusive channel 31 and other communication channels 32 -3M. Upon the receipt of a notice of the occurrence of a fault in the channel 31 by means of the signal 91 , a sound object among the channels 32 -3M selected to be a successor channel in place of the active channel 31 is selected based on a prescribed reference. Then the circuit 8 controls the current channel 31 based on a control signal 101 so as to disable CSC transmission reception operation and uses a control signal 102 to control a channel 32 being the object channel to be in operation in the CSC transmission reception exclusive channel mode.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a satellite communication system, and more particularly to a circuit connection request allocation multiple access system (hereinafter DAMA).
(Hereinafter abbreviated)) satellite communication device.

[0002]

2. Description of the Related Art FIG. 2 is a block diagram showing a schematic configuration example of an entire satellite communication system of this type.

The control earth station 21 is a main DA as shown in FIG.
It comprises an MA control device 31, a CSC modulation / demodulation device 32 that modulates / demodulates a common control signal (hereinafter abbreviated as CSC), and a shared radio transmission / reception device 33. The main DAMA control device 31 generates the CSC in response to the line connection request and performs the CSC modulation / demodulation device 32 in order to perform the DAMA control of the entire system.
Send to. The CSC modulated by the CSC modulator / demodulator 32 is transmitted to each slave station 2 via the satellite station 22 by the common radio transmitter / receiver 33.
It is transmitted to 3 ₁ , 23 ₂ to 23 _N. On the other hand, the control earth station 21 receives the response signals returned from the slave stations 23 ₁ , 23 ₂ to 23 _N by the shared radio transceiver 33, demodulates them by the CSC modulator / demodulator 32, and sends them to the main DAMA controller 31. Tell. The main DAMA control device 31 analyzes the content of this response signal, and again determines the CSC matching the result as a result of each slave station 23 ₁ , 2
3 ₂ to 23 _N.

All of the plurality of slave stations 23 ₁ to 23 _N have the same configuration, and the conventional configuration of one station is shown in FIG.
Each slave station has M communication channels 43 ₁ to 43 _M , _{one of which} is designated as a CSC transmission / reception dedicated channel 43 ₁ . The CSC transmission / reception dedicated channel 43 ₁ and the other communication channels 43 ₂ to 43 _M each have a modulator, a demodulator and a control circuit, and each control circuit is connected via a bidirectional communication port 44. The communication channels 43 ₂ to 43 _M are connected to the telephones 47 _{2 to} 47 _M via external lines, respectively.

Received signals inputted from the control earth station 21 and other slave stations via the satellite station 22 from the reception input terminal 46 are inputted to the demodulator of each communication channel by the distributor 45. The demodulator of the CSC transmission / reception dedicated channel 43 ₁ demodulates only the input CSC, and the received information obtained is analyzed by the control circuit. The control circuit transmits the content of information to the control circuits of all communication channels 43 ₂ to 43 _M or necessary communication channels by the bidirectional communication port 44 according to the analyzed content. The control circuit of the communication channel, to which this CSC information is input, adjusts the control of its own channel in accordance with the contents of the CSC information, and the CSC transmission / reception dedicated channel 43
Report the completion of reception preparation to the control circuit of ₁ and send CSC
The transmission / reception dedicated channel 43 ₁ is a modulator and combiner 42.
A response signal is transmitted to the control earth station 21 via.

[0006] In the case of a call to the own station of the telephone 47 ₂ to 47 _M from the other station telephone the telephone number of the telephone and the destination telephone set off-hook by detecting a control circuit of the communication channel, bi-directional It is transmitted to the control circuit of the CSC transmission / reception dedicated channel 43 ₁ via the communication port 44. The control circuit of the CSC transmission / reception dedicated channel 43 ₁ performs necessary processing on this data, modulates it by the modulator, and notifies the control earth station 21 of the call request as a request signal.

By the above operation, a communication line is established between the calling station and the called station to make a call.

[0008]

The above-mentioned conventional slave station configuration has a drawback that when a failure occurs in the CSC transmission / reception dedicated channel, all communication channels installed in the slave station become incommunicable.

An object of the present invention is to, when a failure occurs in a CSC transmission / reception dedicated channel of a slave station, cause another healthy communication channel to take charge of CSC transmission / reception to continue the transmission / reception operation,
It is an object of the present invention to provide a satellite communication device that enables high quality communication by preventing the suspension of the communication channel of the entire slave station.

[0010]

According to the satellite communication device of the present invention, one of the plurality of communication channels of the slave station is designated as the CSC transmission / reception channel with the control earth station for use. Moreover, when the CSC transmission / reception dedicated channel is constantly monitored and the occurrence of an internal failure is detected, one communication channel that can be used as the CSC transmission / reception dedicated channel is selected from the other communication channels to select the CSC.
It has a monitoring switching circuit for switching to a transmission / reception dedicated channel.

According to the embodiment of the present invention, the monitor switching circuit of the slave station constantly receives an alarm signal for notifying the occurrence of a failure in the channel from each of the CSC transmission / reception dedicated channel and the other communication channels. In addition, the conventional C
It has a function of stopping the operation of the SC transmission / reception dedicated channel and stopping the calling operation and the reception operation of the working CSC transmission / reception dedicated channel.

[0012] According to another embodiment of the present invention, the selection of the alternative CSC transmission / reception dedicated channel by the monitoring switching circuit is performed by the number order pre-assigned to each communication channel, or among the communication channels. It can be performed by designating in advance.

[0013]

One of the plurality of communication channels installed in the slave station is designated as the CSC transmission / reception dedicated channel, and the CSC is communicated with the control earth station via the satellite station. Therefore, in order to prevent the failure of the CSC transmission / reception dedicated channel and the stop of the communication of all the communication channels of the slave station, a monitoring switching circuit is provided to constantly monitor all the channels, and the CSC transmission / reception dedicated channel is constantly monitored. When a failure occurs in, the other one healthy communication channel is immediately selected, and thereafter, it functions as a CSC transmission / reception dedicated channel.

[0014]

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a slave station included in an embodiment of a satellite communication apparatus using the line connection request allocation multiple access system of the present invention. The overall configuration diagram of the satellite communication system shown in FIG. 2 is also applied to the present embodiment, provided that the slave stations 23 ₁ to 23 _N have the configuration shown in FIG. Further, the controlling earth station and the satellite station are the same as those used in the conventional satellite communication system described above,
Description is omitted.

Each slave station 23₁ ~ 23_N Have the same configuration
However, each has multiple communication channels 3 ₁ ~ 3_M Equipped with
1 of which, 3₁ Is a dedicated CSC transmitter / receiver
It is specified as a working channel and is operating. Dedicated to CSC transmission / reception
Channel 3₁ And other communication channels 3₂ ~ 3_M Is that
It consists of a modulator, demodulator and control circuit.
The control circuit is connected via the bidirectional communication port 4. Receiving
The received signal input to the signal input terminal 6 is CSC by the distributor 5.
Transmit / receive channel 3₁ And other communication channels 3₂ ~
Three_M Input to the demodulator. Also, only for CSC transmission / reception
Channel 3₁ And communication channel 3₂ ~ 3_M More output
The transmitted signal to be transmitted is transmitted from the transmission output terminal 1 through the combiner 2.
Be done.

The configuration described above is the same as that of the conventional slave station, but in this embodiment, a monitoring switching circuit 8 is further provided. Each of the control circuits of the CSC transmission / reception dedicated channel 3 ₁ and the communication channels 3 _{2 to} 3 _M receives an alarm signal 9 ₁ when it detects that a failure has occurred inside the respective channel.
The monitoring switching circuit 8 is notified of 9 _{2 to} 9 _M, and the control signals 10 ₁ , 10 ₂ to 10 _M are input from the monitoring switching circuit 8, respectively.

The setting of the communication path between the slave stations is the same as in the case of the above-mentioned conventional example, and therefore its explanation is omitted. Next, the operation of the monitor switching circuit 8 in the slave station of this embodiment will be described.

The monitoring switching circuit 8 is a channel dedicated to CSC transmission / reception.
Le 3₁ And other communication channels 3₂~ 3_M From each
Input alarm signal 9₁ , 9₂ ~ 9_M Always monitor
Alarm signal 9₁ CSC transmission / reception
Flannel 3₁ Communication channel 3 when a failure is reported
₂ ~ 3_M CSC transmission / reception channel currently in use
Three₁ The next dedicated CSC transmission / reception channel instead of
All candidates are selected according to predetermined criteria. As this criterion
Is, for example, the next channel in numerical order, or
Different selection methods are possible, such as
It For example, communication channel 3₂ Is the next CSC dedicated transmission / reception
When selected as a channel, the monitoring switching circuit 8 is the current C
Channel 3 for SC transmission / reception₁ For control signal 10₁ For
And control so that CSC transmission / reception operations cannot be performed.
The next candidate, communication channel 3 ₂ For control signal 1
0₂ To operate in CSC transmit / receive channel mode
Notify you that you should. Communication channel 3₂ Received this notice
If you pick it up, phone 7₂ Do not accept outgoing or incoming calls
The CSC transmission / reception dedicated channel
Acts as a flannel.

[0020]

As described above, according to the present invention, the monitoring switching circuit is used in each slave station to constantly monitor the current CSC transmission / reception dedicated channel, and when the occurrence of the internal failure is notified by the alarm signal, the current operation is performed. The CSC transmit / receive dedicated channel of the other, and replace one of the other communication channels with CS
There is an effect that it is possible to provide a high-quality satellite communication device capable of continuing the communication operation by designating and operating the C transmission / reception dedicated channel.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a slave station included in an embodiment of a satellite communication device of the present invention.

FIG. 2 is a block diagram showing an example of the overall configuration of a satellite communication system.

3 is a block diagram showing a configuration of a control earth station 21 in FIG.

FIG. 4 is a block diagram showing a configuration of a slave station included in a conventional example of a satellite communication device.

[Explanation of symbols]

1 transmission output terminal 2 synthesizer 3 CSC transmission / reception dedicated channel 3 _{2 to} 3 _M communication channel 4 bidirectional communication port 5 distributor 6 reception input terminal 7 _{2 to} 7 _M telephone 8 monitoring switching circuit 9 ₁ , 9 _{2 to} 9 _M alarm Signals 10 ₁ , 10 ₂ to 10 _M Control signal 21 Controlling earth station 22 Satellite station 23 ₁ , 23 ₂ to 23 _N Slave station 24 ₁ , 24 _{2 to} 24 _N External line 31 Main DAMA control device 32 CSC modulator / demodulator device 33 Shared radio Transceiver

Claims (5)

[Claims] 1. A control earth station, a satellite station, and at least one slave station in which a plurality of communication channels are assigned which are assigned communication lines by a common control signal from the control earth station in response to a line connection request. In a multiple-access satellite communication device, one of the plurality of communication channels of the slave station is designated as a common control signal transmission / reception channel with the control earth station, and is used for common control. When a signal transmission / reception dedicated channel is constantly monitored and an internal failure is detected, one of the other communication channels that can be used as a common control signal transmission / reception dedicated channel is selected and set as the common control signal transmission / reception dedicated channel. A satellite communication device having a monitoring switching circuit for switching. 2. The satellite communication according to claim 1, wherein the monitor switching circuit constantly inputs an alarm signal for notifying occurrence of a failure in the channel from each of the common control signal transmission / reception dedicated channel and other communication channels. apparatus. 3. The monitoring switching circuit stops the operation of the conventional common control signal transmission / reception dedicated channel after completing the switching of the common control signal transmission / reception dedicated channel, and makes a call operation to the current common control signal transmission / reception dedicated channel. The satellite communication device according to claim 1, wherein the incoming call operation is stopped. 4. The satellite communication according to claim 1, wherein the selection of the alternate common control signal transmission / reception dedicated channel by the monitoring switching circuit is performed according to a number order pre-assigned to each communication channel. apparatus. 5. The selection of the alternative common control signal transmission / reception dedicated channel by the monitoring switching circuit is designated in advance from among the respective communication channels.
Satellite communication device according to item.