JP3302904B2 - Satellite communication system and circuit control station - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a demand line assignment system (DAMA: Demand Assignment) for allocating communication lines between earth stations in response to line assignment requests from a plurality of earth stations.
Multiple Access) and a fixed line allocation method (PAMA: fixed allocation of communication lines to a plurality of earth stations in advance).
Pre-Assignment Multiple Access) related to the satellite communication system to make the line assignment, especially,
The line control station performs network management and line assignment for both the DAMA system and the PAMA system.

[0002]

2. Description of the Related Art FIG. 3 is a system configuration diagram showing a configuration of a satellite communication system to which a conventional PAMA system is applied.
In FIG. 3, reference numeral 1 denotes a central station serving as a line control station for monitoring and controlling the use status of communication lines of the DAMA network collectively, 2 denotes a communication satellite which is launched into outer space and relays a satellite line, and 3 denotes a central station 1. , 4 is a common signal line between the peripheral station 3 and the central station 1.
Is a PAMA communication line, and 31 are peripheral stations communicating with each other using the PAMA communication line 5. Here, as shown in FIG. 4, the peripheral station 3 includes an antenna 21, a transmission / reception device 22, a modulation / demodulation device 26 including a modulation / demodulation unit 23 and a line control unit 24, and a communication terminal 25.

Next, the operation will be described. As shown in FIG. 3, two peripheral stations 31 of the peripheral stations 3
Communicate with each other via a PAMA communication line 5 that relays the data. At this time, the central station 1 only monitors and controls the use status of the communication lines of the peripheral stations in the DAMA network collectively, so that the two peripheral stations 31 communicate using the PAMA communication line 5. Can not judge.

In order for the two peripheral stations 31 to enter the DAMA network of the central station 1 after the end of the PAMA communication, the modems 26 of the two peripheral stations 31
It is necessary to change the setting from the PAMA communication line 5 to the common line signal line 4 and change the setting of the line control unit 24 for DAMA.

[0005]

Since the above configuration is the same as that of the conventional satellite communication system, monitoring and control are not performed from the central station 1 which is a line control station located at the center of the DAMA network. The communication line used as the PAMA communication line 5 and the modem 26 of the two peripheral stations 31 had to be excluded from the DAMA network. In addition, in order for the modem of the peripheral station used in the PAMA system to enter the DAMA network, there is a problem that the peripheral station needs to change the setting of the modem from PAMA to DAMA.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a single line control station uses a PAMA.
System and DAMA system can be managed and operated collectively, and the PAMA system and DAM system
Satellite communication system and line control that does not require A-system switching
The purpose is to provide your bureau .

[0007]

A satellite communication system according to the present invention transmits a signal from a calling earth station through a common signal line.
The line control station, based on the line assignment request signal
Is set, and communication between earth stations is performed by the set communication line.
It has a line allocation function by the line allocation method when requesting communication.
In a satellite communication system,
A pair of earth stations and a communication line for the pair of earth stations.
Recorded from this one of the registered earth stations
When this request signal is received, the communication circuit for the pair of earth stations
A line is directed to the one earth station by the common signal line.
It has a line assignment function using a fixed line assignment method . In addition, the line control station
Fixed line if line is in use due to line allocation on demand
Reservation registration as a communication line using the allocation method
The fixed line allocation method is used from the time when the communication line becomes free.
It is characterized in that it can be used as a communication line
is there. In addition, the line control station may be any one of a pair of earth stations.
Either or both are in use by the demand line allocation method
In this case, a pair of earth stations using a fixed line
About registration, fixed from the time the used earth station becomes free
To be usable as an earth station using the circuit assignment method.
It is a feature. Further, the line system according to the present invention
Your station is transmitted by a common signal line from the calling earth station
Communication between earth stations based on the line assignment request signal
A line allocator using the line allocation method on demand to set the communication line
In a line control station that has functions, a specific pair of earth stations
Register this pair of earth station communication lines and register
Received a line assignment request signal from one of the earth stations
Then, the communication line for the pair of earth stations is transmitted to the common signal.
The one of the above earth stations is instructed by a line.
Things.

[0008]

[0009]

[0010]

[0011]

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram showing a satellite communication system according to Embodiment 1 of the present invention. In FIG. 1, reference numeral 1 denotes a central station of a network serving as a line control station for collectively monitoring and controlling the use status of a communication line, 2 denotes a communication satellite which is launched into outer space and relays a satellite line, and 3 denotes the line control station. Is a peripheral station connected to the central station 1 via the communication satellite 2 by the common channel signal line 4.

Here, the central station 1 has the configuration shown in the block diagram of FIG. As shown in FIG. 2, the central station 1 includes an antenna 11, a transmission / reception apparatus 12, a modulation / demodulation apparatus 13, a DAMA control unit 14 for monitoring and controlling a network such as line allocation and release, and registration of peripheral stations and communication lines. And a DAMA line controller 16 having a DAMA operation / display unit 15 for performing display.
When receiving a line assignment request signal from an arbitrary calling peripheral station 3 via the common line signal line 4, the control unit 14 searches for a free communication line and sends the common line signal line 4 to the calling peripheral station 3. Having a line assignment function by a request-time line assignment method, such that a communication line is assigned only when requested by designating a communication line to be used via
When a pair of communication lines capable of communicating with each other between a pair of earth stations (either the central station 1 or the peripheral station 3) is registered, and a line assignment request signal from one of the registered earth stations is received. In addition, a line assignment function based on a fixed line assignment method for fixedly assigning a communication line by designating a communication line registered with the pair of earth stations is provided.

Next, the operation will be described. Central Station 1 D
The AMA controller 14 controls the common signal line 4
When a line assignment request signal from an arbitrary calling peripheral station 3 is received via the
Has a line assignment function by a request line assignment method in which a communication line is assigned only when requested by designating a communication line to be used via the common line signal line 4.

In such a central station 1, a set of communications used for communication between the DAMA control unit 14 and the modems of two specific peripheral stations 31, 32 from the DAMA operation / display unit 15 are used. When the line is set, the DAMA control unit 14 registers the set contents. When receiving the line assignment request from the peripheral station 31 or 32 via the common signal line 4, the DAMA control unit 14 determines the registered peripheral stations 31 and 32 based on the line assignment by the fixed line assignment method. To use the communication line. Thus, the peripheral stations 31 and 32 perform communication based on the line assignment according to the fixed line assignment method. After the communication is completed, the peripheral stations 31 and 32 are again monitored and controlled by the central station 1 via the common channel signal line 4.

Therefore, according to the first embodiment, DA
Since the PAMA system that was independent of the MA system network was configured to enter the network,
There is an effect that the DAMA system and the PAMA system can be monitored and controlled by one central station.

Embodiment 2 FIG. For the DAMA control unit 14 of the central station 1, the DAMA operation / display unit 15 sets and registers a plurality of communication lines used for mutual communication with the modems of the specific two peripheral stations 31 and 32. In this way, when the DAMA control unit 14 of the central station 1 receives a line assignment request signal from any one of the registered peripheral stations, the idle communication is performed from a plurality of sets of communication lines registered with the pair of peripheral stations. A fixed assignment of a communication line can be performed by searching and instructing a line.

That is, when the state of the communication line is deteriorated, the peripheral stations end the communication once, and make a line allocation request to the central station 1 again. At this time, the DAMA control unit 14 of the central station 1 instructs to allocate a line different from the previously allocated communication line. As a result, communication that avoids the deteriorated communication line can be performed.

Embodiment 3 In addition, DAMA of central station 1
From the DAMA operation / display unit 15 to the control unit 14,
When setting and registering a set of communication lines for AMA, even if the communication line is already in use for DAMA, make a reservation registration for PAMA and set it for PAMA at the end of DAMA communication. , Registration is DAMA
By being recognized by the line controller 16,
A communication line is secured by the PAMA method.

Embodiment 4 In addition, DAMA of central station 1
From the DAMA operation / display unit 15 to the control unit 14,
When a plurality of communication lines are set and registered for AMA, even if some of the communication lines are already in use for DAMA, PAMA is set in the same manner as in the third embodiment.
A plurality of sets of communication lines are reserved and registered for use in the PAMA system at the end of the DAMA system communication, and are sequentially set for the PAMA system so that the registration is recognized by the DAMA line controller 16. A communication line is secured.

Embodiment 5 In addition, DAMA of central station 1
From the DAMA operation / display unit 15 to the control unit 14,
When setting and registering the modems of two specific peripheral stations 31 and 32 for AMA, the reservation is registered even if one or both are already in use for DAMA, and the time of the end of the DAMA communication By setting the DAMA line controller 16 to recognize the setting registration for PAMA, the two peripheral stations 31, 3
2 is secured.

Embodiment 6 FIG. Embodiments 1 to 5 above
, Transmission speeds of communication lines for PAMA and DAMA are 16 Kbps, 32 Kbps, 64 Kb
ps, 128Kbps, 384Kbps, 512Kbp
s, 768 Kbps, 1.5 Mbps, 3 Mbps, 6
Mbps can be used, and any speed can be selected and applied.

[0023]

As described above, the satellite communication according to the present invention is performed.
According to the system, the calling earth station uses a common signal line
The line control station communicates based on the line allocation request signal to be transmitted.
Set the communication line, and use this communication line to set the earth station.
Line allocation function by the line allocation method on demand for communication between
In the satellite communication system having
Is a communication pair for a particular pair of earth stations and this pair of earth stations.
Register a line and from one of these registered earth stations
Receiving the line allocation request signal of
The communication line is connected to the one earth station by the common signal line.
Has a line allocation function based on the fixed line allocation method that instructs
Since so that the PAMA scheme independent of the network DAMA schemes, it is possible to participate in the network of DAMA schemes, DAMA method and PAM
There is an effect that the A system can be monitored and controlled by one line control station. In the surrounding stations, the DAMA system and PA
Since it is not necessary to distinguish between the MA systems, it is possible to obtain an effect that switching of setting change of the modem is unnecessary. In addition,
The line control station determines that the communication line is
Registered as a communication line using the fixed line allocation method.
Recording, and the fixed number of times from when the used communication line becomes free
Enable to use as communication line by line assignment method
At the end of the DAMA communication, the PAMA
A communication line according to the formula can be secured. Also,
The line control station is either one or both of a pair of earth stations
Fixed line when is in use by demand line allocation method
Reserved and registered as a pair of earth stations using the allocation method
Fixed line allocation method from the time when
DAM
At the end of A-method communication, secure stations by PAMA method
can do. Further, the line control station according to the present invention
Is the line transmitted by the common signal line from the calling earth station
Communication cycle for communication between earth stations based on the assignment request signal
Line assignment function by line assignment method when requesting line setting
, A specific pair of earth stations and this
Register a pair of earth station communication lines and want to register
It receives the line assignment request signal from the deviation or the other earth stations
And the communication line for the pair of earth stations to the common signal line
To instruct one of the above earth stations,
PAMA who was independent of AMA network
Entering a formula into a DAMA network
, The DAMA system and PAMA system can be controlled by one line
This has the effect that monitoring and control can be performed at your station. Also,
Neither the DAMA nor the PAMA system need to be distinguished
Therefore, it is not necessary to switch the setting of the modem.
The effect is also obtained.

[0024]

[0025]

[0026]

[0027]

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a satellite communication system according to Embodiment 1 of the present invention.

FIG. 2 is a block diagram showing a configuration of a central station in FIG.

FIG. 3 is a configuration diagram illustrating a conventional satellite communication system.

FIG. 4 is a block diagram illustrating a configuration of a peripheral station in FIG. 3;

[Explanation of symbols]

1 central station, 2 communication satellite, 3 peripheral station, 4 common line signal line, 5 PAMA communication line, 11 antenna, 12
Transmission / reception device, 13 modem, 14 DAMA control unit, 15 DAMA operation / display unit, 16 DAMA line control device, 21 antenna, 22 transmission / reception device, 23
Modulation / demodulation unit, 24 line control unit, 25 communication terminal, 26
Modem, 31 PAMA peripheral station, 32 PAMA
For peripheral stations.

Claims (4)

(57) [Claims] 1. Transmission from a calling earth station via a common signal line.
The line control station communicates based on the
Line, and the communication line between the earth stations
Has a line assignment function using the line assignment method when requesting communication
In a satellite communication system,
A fixed pair of earth stations and a communication line for this pair of earth stations
Register, and a line from one of the registered earth stations
Upon receiving the assignment request signal, the communication for the pair of earth stations is performed.
Indicate the line to the above one earth station by the above common signal line
A satellite communication system having a line assignment function based on a fixed line assignment method . 2. The satellite communication system according to claim 1, wherein said line control station uses a line assignment upon demand.
Communication line using the fixed line allocation method
When the communication line in use is vacant
Can be used as a fixed-line allocation communication line
A satellite communication system. 3. The method of claim 1 Symbol board satellite communications systems, the line control station, either one of the pair of earth stations or
Or if both are in use on demand line allocation,
Reservation registration as a pair of earth stations by fixed line allocation method
From the point when the earth station in use becomes free.
A satellite communication system characterized by being usable as an earth station according to this method . 4. A transmission from a calling earth station via a common signal line.
Communication between earth stations based on the
Set the communication line to be performed.
In a line control station having an assignment function, a specific pair of
Register the base station and the communication line for this pair of earth stations,
Line assignment request signal from one of the registered earth stations
Received, the communication line for the pair of earth stations
Instructing one of the above earth stations via a communication line
Line control station to be used.