JP3647713B2 - Satellite communication control system - Google Patents

Satellite communication control system Download PDF

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JP3647713B2
JP3647713B2 JP2000096846A JP2000096846A JP3647713B2 JP 3647713 B2 JP3647713 B2 JP 3647713B2 JP 2000096846 A JP2000096846 A JP 2000096846A JP 2000096846 A JP2000096846 A JP 2000096846A JP 3647713 B2 JP3647713 B2 JP 3647713B2
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JP2001285168A (en
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利和 金正
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Description

【０００１】
【発明の属する技術分野】
この発明は、衛星通信制御システム、特に子局から送信されるデータ量に応じて専用回線を自動的に割り当てる衛星通信制御システムに関するものである。
【０００２】
【従来の技術】
図５は、従来のＴＤＭ／ＴＤＭＡ方式による親局と、複数の子局（ｌ、ｍ、ｎ）間のデータ通信を行なうスター型の衛星通信システムを示す概略図である。
この図において、１００は通信衛星、１は親局に設置された回線制御装置、２は親局から子局への通信を行なうＴＤＭ方式による下り回線、３は子局から親局への通信を行なうＴＤＭＡ方式による上り回線である。
【０００３】
次に、従来の衛星通信システムの動作について説明する。
親局から子局への信号は、下り回線２によりＴＤＭ方式で送信され、各子局ｌ、ｍ、ｎはフレームの中のＩＤを検出することにより自局宛の信号を識別する。子局から親局への信号は、上り回線３によりＴＤＭＡ回線のタイムスロットに自局のＩＤを付与したバースト信号を送信することで伝送される。
子局相互間の信号、例えば子局ｌから子局ｍへの信号は、一旦、子局ｌから親局に送信を行ない、親局のルーティング装置によって、子局ｍへの信号と認識することにより、親局から子局ｍに送信することで、信号が伝送される。
【０００４】
【発明が解決しようとする課題】
従来のＴＤＭ／ＴＤＭＡ方式のデータ伝送は、以上のように構成されているため、特定の子局から送信される信号が多くなると、上り回線３をほとんど占有することになり、他の子局の送信でみるデータ量が制限される。また、複数の子局が多くの信号の送信を始めた時は、輻輳状態になり、システム全体のトラフィックが低下する。
この場合、特定の子局に専用のタイムスロット（専用チャンネル）を用意することにより、スループットを向上させることが考えられるが、ＴＤＭＡ通信では限界があった。
また、子局間の通信は、上述のように、親局を介して信号が伝送されるため、相手局からの応答が返るまで通信衛星の中継を２回行なう必要があり、伝送遅延が発生するなどの問題があった。
【０００５】
この発明は上記のような問題点を解消するためになされたもので、子局からの送信信号が多くなった時、子局に専用回線の割り当てを行ない、子局からの送信信号が高い信頼度で親局に伝送されるようにすること及び子局間の通信遅延が最も少なくなる回線制御システムを得ることを目的とする。
更に、子局からの専用回線の割り当て要求を行わずに、送信データ量により自動的に専用回線の割り当てを行なう衛星通信制御システムを得ることを目的とする。
【０００６】
【課題を解決するための手段】
この発明に係る衛星通信制御システムは、親局と複数の子局との間及び複数の子局相互間の衛星通信回線を有し、親局から子局へはＴＤＭ方式による通信を行ない、子局から親局へはＴＤＭＡ方式による通信を行なう衛星通信制御システムにおいて、子局からの送信信号の量を監視すると共に、所定の子局からの送信信号が所定量を超えた時、あるいは子局から親局への送信回線の信号が混み合った時、ＴＤＭＡ回線とは別の連続波による専用回線を設定するための制御信号を所定の子局あるいは送信データ量の多い子局に多重送信する回線監視制御装置を親局に設け、子局にＴＤＭ回線信号と上記専用回線の信号とを分離する分配器と上記分配器に接続され、上記各回線信号をそれぞれ受信するためのＴＤＭ復調器及び専用回線復調器と、上記専用回線を設定する変調器と、上記制御信号受信時に上記専用回線復調器及び変調器に上記専用回線の周波数を設定して上記専用回線を設定すると共に、上記変調器を連続動作させて上記専用回線による上記親局へのデータ伝送を行なう制御部とを設けたものである。
【０００７】
この発明に係る衛星通信制御システムは、また、親局と複数の子局との間及び複数の子局相互間の衛星通信回線を有し、親局から子局へはＴＤＭ方式による通信を行ない、子局から親局へはＣＤＭＡ方式による通信を行なう衛星通信制御システムにおいて、子局からの送信信号の量を監視すると共に、所定の子局からの送信信号が所定量を超えた時、あるいは子局から親局への送信回線の信号が混み合った時、ＣＤＭＡ回線とは別の連続波による専用回線を設定するための制御信号を所定の子局あるいは送信データ量の多い子局に多重送信する回線監視制御装置を親局に設け、子局にＴＤＭ回線信号と上記専用回線の信号とを分離する分配器と上記分配器に接続され、上記各回線信号をそれぞれ受信するためのＴＤＭ復調器及び専用回線復調器と、上記専用回線を設定する変調器と、上記制御信号受信時に上記専用回線復調器及び変調器に上記専用回線の周波数を設定して上記専用回線を設定すると共に、上記変調器を連続動作させて上記専用回線による上記親局へのデータ伝送を行なう制御部とを設けたものである。
【０００８】
この発明に係る衛星通信制御システムは、また、回線監視制御装置が、子局間の通信信号量の増大を検出した時は、当該子局に連続波による双方向の専用回線を割り当てるようにしたものである。
【０００９】
この発明に係る衛星通信制御システムは、また、割り当てられた専用回線によってデータの伝送を行なった子局は、データの伝送が終了した時、あるいは専用回線のデータ伝送量が減少した時に専用回線を開放すると共に、回線監視制御装置にその旨を通知するものである。
【００１０】
この発明に係る衛星通信制御システムは、また、割り当てられた専用回線によるデータ伝送を親局に設置された回線監視制御装置によって監視し、子局が、データの伝送を終了した時、あるいは専用回線のデータ伝送量が減少した時に、当該子局に対して専用回線の開放を要求するようにしたものである。
【００１１】
この発明に係る衛星通信制御システムは、また、専用回線の伝送速度を子局のデータ伝送量に応じて可変としたものである。
【００１２】
この発明に係る衛星通信制御システムは、また、専用回線を複数回線としたものである。
【００１３】
【発明の実施の形態】
実施の形態１．
以下、この発明の実施の形態１を図について説明する。図１は、実施の形態１において、子局ｌと親局との間に専用回線が設定された状態を示す概略図、図２は、実施の形態１において、他の子局ｍと親局との間に専用回線が設定された状態を示す概略図、図３は、実施の形態１において、子局相互間に双方向の専用回線が設定された状態を示す概略図である。
これらの図において、１００は通信衛星、１ａは親局に設置された回線監視制御装置、２は親局から子局への通信を行なうＴＤＭ方式による下り回線、３は子局から親局への通信を行なうＴＤＭＡ方式による上り回線、４は連続波による専用回線で、４ａは子局１から親局への連続波による専用回線、４ｂは同じく子局ｍから親局への連続波による専用回線、４ｃは子局ｌから子局ｎへの子局相互間の連続波による専用回線、５は監視回線である。
【００１４】
また、図４は、実施の形態１における子局の構成を示すブロック図である。
この図において、１１はアンテナから入力される受信信号をＴＤＭ回線信号と連続波による専用回線信号とに分離する分配器、８は親局からのデータ信号及び制御信号を受信するためのＴＤＭ復調器、９は子局間通信の連続波による専用回線信号を受信するための復調器、１０は送受信信号をＬＡＮなどに接続するインターフェース部、６は親局への信号伝送時にＴＤＭＡ変調器として動作し、連続波による専用回線を設定する時は連動動作変調器として動作する変調器、７は上述したＴＤＭ復調器８によって親局から受信した制御信号がインターフェース部１０を経て入力され、入力制御信号に応じて変調器６及び復調器９を制御する制御部である。
【００１５】
次に、実施の形態１の動作について説明する。親局の回線監視制御装置１ａは、各子局が送信する上り回線３のデータ量を監視しており、特定の子局、例えば子局ｌが送信する一定時間当たりのデータ量が所定量を超えた時は、その子局に対し、あるいは上り回線３のトラフィックが混み合った時は、送信データ量の多い子局に対し、連続波による専用回線を設定するための制御信号を下り回線２に多重して送信する。この制御信号は子局ｌにおいて図４の分配器１１を経てＴＤＭ復調器８で受信され、インターフェース部１０に送られる。
インターフェース部１０は、制御信号を認識し、制御部７に入力する。
制御部７は、この制御信号にもとづいて 変調器６と復調器９に指定された専用回線の周波数を設定して専用回線４ａを設定すると共に、変調器６を連続動作させて専用回線による親局へのデータ伝送を行なう。
これによって、上り回線３のトラフィックは軽減され、子局のデータ伝送時間が短縮される。
【００１６】
子局ｌは親局へのデータ伝送が終了した時、またはトラフィックが減少した時に、制御部７の制御により、専用回線４ａを開放して上り回線３に移行し、親局の回線監視制御装置１ａに専用回線４ａを開放したことを通知する。
他の子局、例えば子局ｍが送信する一定時間あたりのデータ量が所定量を超えた時は、上述した子局ｌと同様に、子局ｍに対して図２に示す専用回線４ｂが設定される。設定に至る手順は、子局ｌの場合と同様であるため、説明を省略する。
一方、子局間の通信トラフィックの増大を回線監視制御装置１ａが検知した時は、当該子局、例えば子局ｌと子局ｎに対して連続波による子局間通信用専用回線を設定するための制御信号を下り回線２に多重して送信し、各子局ｌとｎにおいては、上述の場合と同様に、変調器６と復調器９に子局間通信用専用回線の周波数を設定して、子局間の専用回線４ｃを設定する。各子局とも、データの送出は変調器６の連続動作によって行ない、受信は復調器９によって行なうことにより双方向のデータ通信が行なわれる。
なお、子局間の通信においても、トラフィックが減少した時に制御部７の制御により、専用回線４ｃを開放して上り回線３に移行し、親局の回線監視制御装置１ａに専用回線４ｃを開放したことを通知する。
【００１７】
実施の形態２．
上述した実施の形態１では、専用回線は１回線設けられるものであるが、専用回線を複数設けることにより、複数の子局が同時に利用できる構成とすることもできる。
【００１８】
実施の形態３．
また、上述した実施の形態１では、上り回線３をＴＤＭＡ方式による回線としているが、これをＣＤＭＡ方式による回線にしても実施の形態１と同様な効果を期待することができる。
【００１９】
実施の形態４．
また、上述した実施の形態１では、専用回線４の開放は、子局の制御部７によって制御されるものであるが、親局に設置された回線監視制御装置１ａが、監視回線５によって専用回線の監視を行ない、子局からのデータ伝送の終了時、あるいは専用回線のデータ伝送量の減少時に、子局に対する専用回線の開放要求を行なうようにすることもできる。
【００２０】
実施の形態５．
以上の各実施の形態における専用回線は、その伝送速度を子局のトラフィックに応じて可変とすることができる。これによって、衛星周波数帯域を有効に使用することが可能となる。
【００２１】
【発明の効果】
この発明の衛星通信制御システムは、親局と複数の子局との間及び複数の子局相互間の衛星通信回線を有し、親局から子局へはＴＤＭ方式による通信を行ない、子局から親局へはＴＤＭＡ方式による通信を行なう衛星通信制御システムにおいて、子局からの送信信号の量を監視すると共に、所定の子局からの送信信号が所定量を超えた時、あるいは子局から親局への送信回線の信号が混み合った時、ＴＤＭＡ回線とは別の連続波による専用回線を設定するための制御信号を所定の子局あるいは送信データ量の多い子局に多重送信する回線監視制御装置を親局に設け、子局にＴＤＭ回線信号と上記専用回線の信号とを分離する分配器と上記分配器に接続され、上記各回線信号をそれぞれ受信するためのＴＤＭ復調器及び専用回線復調器と、上記専用回線を設定する変調器と、上記制御信号受信時に上記専用回線復調器及び変調器に上記専用回線の周波数を設定して上記専用回線を設定すると共に、上記変調器を連続動作させて上記専用回線による上記親局へのデータ伝送を行なう制御部とを設けたものであるため、データ伝送時間を短縮することができる他、システムのトラフィック変動への対応が容易となる。
【００２２】
この発明の衛星通信制御システムは、また、子局から親局への通信をＣＤＭＡ方式としたため、ＴＤＭＡ方式の場合と同様に、データ伝送時間を短縮することができ、システムのトラフィック変動への対応が容易となる。
【００２３】
この発明の衛星通信制御システムは、また、回線監視制御装置が、子局間の通信信号量の増大を検出した時は、当該子局に連続波による双方向の専用回線を割り当てるようにしたため、専用回線の設定を自動的に行なうことができると共に、子局間の通信遅延を改善することができる。
【００２４】
この発明の衛星通信制御システムは、また、割り当てられた専用回線によってデータの伝送を行なった子局は、データの伝送が終了した時、あるいは専用回線のデータ伝送量が減少した時に専用回線を開放すると共に、回線監視制御装置にその旨を通知するようにしたため、専用回線を効率よく利用することができる。
【００２５】
この発明の衛星通信制御システムは、また、割り当てられた専用回線によるデータ伝送を回線監視制御装置によって監視し、子局が、データの伝送を終了した時、あるいは専用回線のデータ伝送量が減少した時に、当該子局に対して専用回線の開放を要求するようにしたため、回線監視機能を親局にまとめることができると共に、システムのトラフィック変動への対応が容易となる。
【００２６】
この発明の衛星通信制御システムは、また、専用回線の伝送速度を子局のデータ伝送量に応じて可変としたため、衛星周波数帯域を有効に使用することができる。
【００２７】
この発明の衛星通信制御システムは、また、専用回線を複数としたため、複数の子局に同時に専用回線を割り当てることができる。
【図面の簡単な説明】
【図１】 この発明の実施の形態１において、子局と親局との間に専用回線が設定された状態を示す概略図である。
【図２】 実施の形態１において、他の子局と親局との間に専用回線が設定された状態を示す概略図である。
【図３】 実施の形態１において、子局相互間に双方向の専用回線が設定された状態を示す概略図である。
【図４】 実施の形態１における子局の構成を示すブロック図である。
【図５】 従来のＴＤＭ／ＴＤＭＡ方式による親局と複数の子局間のデータ通信を行なうスター型の衛星通信システムを示す概略図である。
【符号の説明】
１ａ 回線監視制御装置、２ 下り回線、３ 上り回線、
４ａ、４ｂ、４ｃ 専用回線、５ 監視回線、
６ ＴＤＭＡ／連続動作 変調器、７ 制御部、８ ＴＤＭ復調器、
９ 専用回線 復調器、１０ インターフェース部、１１ 分配器、
１００ 通信衛星。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a satellite communication control system, and more particularly to a satellite communication control system that automatically assigns a dedicated line according to the amount of data transmitted from a slave station.
[0002]
[Prior art]
FIG. 5 is a schematic diagram showing a star-type satellite communication system that performs data communication between a master station according to a conventional TDM / TDMA system and a plurality of slave stations (l, m, n).
In this figure, 100 is a communication satellite, 1 is a line control device installed in the master station, 2 is a downlink using a TDM system for communication from the master station to the slave station, and 3 is a communication from the slave station to the master station. This is an uplink by the TDMA system to be performed.
[0003]
Next, the operation of the conventional satellite communication system will be described.
A signal from the master station to the slave station is transmitted by the TDM system via the downlink 2, and each slave station l, m, n identifies the signal addressed to itself by detecting the ID in the frame. A signal from the slave station to the master station is transmitted by transmitting a burst signal in which the ID of the local station is assigned to the time slot of the TDMA line via the uplink 3.
A signal between slave stations, for example, a signal from the slave station 1 to the slave station m is once transmitted from the slave station 1 to the master station, and is recognized as a signal to the slave station m by the routing device of the master station. Thus, a signal is transmitted by transmitting from the master station to the slave station m.
[0004]
[Problems to be solved by the invention]
Since the conventional TDM / TDMA data transmission is configured as described above, if the number of signals transmitted from a specific slave station increases, the uplink 3 is almost occupied, and other slave stations The amount of data seen in transmission is limited. Further, when a plurality of slave stations start transmitting a large number of signals, a congestion state occurs, and the traffic of the entire system decreases.
In this case, it is conceivable to improve the throughput by preparing a dedicated time slot (dedicated channel) for a specific slave station, but TDMA communication has a limit.
In addition, since communication between slave stations is transmitted through the master station as described above, it is necessary to relay the communication satellite twice until a response is returned from the partner station, resulting in transmission delay. There was a problem such as.
[0005]
The present invention has been made to solve the above problems. When the number of transmission signals from a slave station increases, a dedicated line is allocated to the slave station, and the transmission signal from the slave station is highly reliable. It is an object of the present invention to obtain a line control system in which transmission delay is minimized and communication delay between slave stations is minimized.
It is another object of the present invention to provide a satellite communication control system that automatically assigns a dedicated line according to the amount of transmission data without making a dedicated line assignment request from a slave station.
[0006]
[Means for Solving the Problems]
The satellite communication control system according to the present invention has a satellite communication line between a master station and a plurality of slave stations and between a plurality of slave stations, performs communication by TDM from the master station to the slave stations, In a satellite communication control system that performs communication by TDMA from a station to a master station, the amount of transmission signal from the slave station is monitored, and when the transmission signal from a predetermined slave station exceeds a predetermined amount, or the slave station When a transmission line signal from the master station to the master station is crowded, a control signal for setting a dedicated line by a continuous wave different from the TDMA line is multiplexed and transmitted to a predetermined slave station or a slave station with a large amount of transmission data provided line monitoring control unit to the master station, is connected to the distributor and the distributor that separates the signals of the TDM line signal and the dedicated line to the slave stations, and TDM demodulator for receiving the respective line signals, respectively and private line demodulator, A modulator for setting the serial dedicated line, and by setting the frequency of the leased line to the private line demodulator and the modulator when the control signal received and sets the dedicated line, is continuously operating the modulator the And a control unit for performing data transmission to the master station via a dedicated line .
[0007]
The satellite communication control system according to the present invention also has a satellite communication line between a master station and a plurality of slave stations and between a plurality of slave stations, and performs communication using the TDM method from the master station to the slave stations. In the satellite communication control system that performs communication by CDMA from the slave station to the master station, the amount of transmission signal from the slave station is monitored and the transmission signal from the predetermined slave station exceeds a predetermined amount, or When signals on the transmission line from the slave station to the master station are crowded, a control signal for setting a dedicated line by a continuous wave different from the CDMA line is multiplexed to a predetermined slave station or a slave station with a large amount of transmission data provided line monitoring control unit to be transmitted to the master station, it is connected to the distributor and the distributor that separates the signals of the TDM line signal and the dedicated line to the slave station, TDM demodulation for receiving the respective line signals, respectively vessels and dedicated line demodulation When, a modulator for setting the dedicated line, by setting the frequency of the leased line to the private line demodulator and the modulator when the control signal received and sets the dedicated line, is continuously operating the modulator And a control unit for transmitting data to the master station via the dedicated line .
[0008]
In the satellite communication control system according to the present invention, when the line monitoring control device detects an increase in the amount of communication signal between the slave stations, a bidirectional dedicated line using a continuous wave is assigned to the slave station. Is.
[0009]
In the satellite communication control system according to the present invention, the slave station that has transmitted data through the assigned dedicated line may use the dedicated line when the data transmission is completed or when the data transmission amount of the dedicated line decreases. In addition to releasing, it notifies the line monitoring and control device to that effect.
[0010]
In the satellite communication control system according to the present invention, the data transmission through the assigned dedicated line is monitored by the line monitoring control device installed in the parent station, and when the slave station finishes the data transmission, or the dedicated line When the amount of data transmission decreases, the slave station is requested to release the dedicated line.
[0011]
In the satellite communication control system according to the present invention, the transmission speed of the dedicated line is variable according to the data transmission amount of the slave station.
[0012]
The satellite communication control system according to the present invention also has a plurality of dedicated lines.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram showing a state in which a dedicated line is set between a slave station l and a master station in the first embodiment, and FIG. 2 shows another slave station m and a master station in the first embodiment. FIG. 3 is a schematic diagram showing a state in which a two-way dedicated line is set between slave stations in the first embodiment.
In these figures, 100 is a communication satellite, 1a is a line monitoring control device installed in the master station, 2 is a downlink using the TDM system for communication from the master station to the slave station, and 3 is a link from the slave station to the master station. Uplink by TDMA system for communication, 4 is a dedicated line by continuous wave, 4a is a dedicated line by continuous wave from slave station 1 to parent station, 4b is also a dedicated line by continuous wave from slave station m to parent station 4c is a dedicated line by a continuous wave between the slave stations from the slave station l to the slave station n, and 5 is a monitoring line.
[0014]
FIG. 4 is a block diagram showing the configuration of the slave station in the first embodiment.
In this figure, 11 is a distributor that separates a received signal input from an antenna into a TDM line signal and a continuous wave dedicated line signal, and 8 is a TDM demodulator for receiving a data signal and a control signal from the master station. , 9 is a demodulator for receiving a dedicated line signal by continuous waves of communication between slave stations, 10 is an interface unit for connecting transmission / reception signals to a LAN, etc., and 6 operates as a TDMA modulator during signal transmission to the master station. When setting a dedicated line by a continuous wave, a modulator that operates as a linked operation modulator, 7 is a control signal received from the master station by the TDM demodulator 8 described above via the interface unit 10, and is used as an input control signal. Accordingly, the control unit controls the modulator 6 and the demodulator 9.
[0015]
Next, the operation of the first embodiment will be described. The channel monitoring control device 1a of the master station monitors the data amount of the uplink 3 transmitted by each slave station, and the data amount per fixed time transmitted by a specific slave station, for example, the slave station l, is a predetermined amount. When it exceeds the limit, the control signal for setting the dedicated line by the continuous wave is sent to the downlink 2 for the slave station or when the traffic on the uplink 3 is congested. Multiplex transmission. This control signal is received by the TDM demodulator 8 through the distributor 11 in FIG. 4 in the slave station l and sent to the interface unit 10.
The interface unit 10 recognizes the control signal and inputs it to the control unit 7.
Based on the control signal, the control unit 7 sets the frequency of the dedicated line designated by the modulator 6 and the demodulator 9 to set the dedicated line 4a, and operates the modulator 6 continuously to control the parent line by the dedicated line. Data transmission to the station.
As a result, the traffic on the uplink 3 is reduced, and the data transmission time of the slave station is shortened.
[0016]
When the data transmission to the master station is completed or when the traffic decreases, the slave station l opens the dedicated line 4a and shifts to the uplink 3 under the control of the control unit 7, and the line monitoring control device of the master station 1a is notified that the leased line 4a has been released.
When the amount of data per fixed time transmitted by another slave station, for example, the slave station m exceeds a predetermined amount, as with the slave station l described above, the dedicated line 4b shown in FIG. Is set. Since the procedure to reach the setting is the same as that in the case of the slave station l, the description is omitted.
On the other hand, when the line monitoring control device 1a detects an increase in communication traffic between the slave stations, a dedicated line for inter-slave communication is set for the slave stations, for example, the slave station l and the slave station n. For each of the slave stations l and n, the frequency of the dedicated line for inter-slave communication is set in the modulator 6 and the demodulator 9 in the same manner as described above. Then, the dedicated line 4c between the slave stations is set. In each slave station, data transmission is performed by the continuous operation of the modulator 6, and reception is performed by the demodulator 9 for bidirectional data communication.
In the communication between the slave stations, when the traffic decreases, the control unit 7 controls to release the dedicated line 4c and shift to the upstream line 3, and open the dedicated line 4c to the master station line monitoring control device 1a. Notify you.
[0017]
Embodiment 2. FIG.
In Embodiment 1 described above, one dedicated line is provided. However, by providing a plurality of dedicated lines, a configuration in which a plurality of slave stations can be used at the same time can be used.
[0018]
Embodiment 3 FIG.
In the first embodiment described above, the uplink 3 is a TDMA line, but if this is a CDMA line, the same effect as in the first embodiment can be expected.
[0019]
Embodiment 4 FIG.
In the first embodiment described above, the opening of the dedicated line 4 is controlled by the control unit 7 of the slave station, but the line monitoring control device 1a installed in the master station is dedicated by the monitoring line 5. It is also possible to monitor the line and make a request for opening the dedicated line to the slave station at the end of data transmission from the slave station or when the data transmission amount of the dedicated line is reduced.
[0020]
Embodiment 5 FIG.
The dedicated line in each of the above embodiments can change the transmission speed according to the traffic of the slave station. This makes it possible to use the satellite frequency band effectively.
[0021]
【The invention's effect】
The satellite communication control system of the present invention has a satellite communication line between a master station and a plurality of slave stations and between a plurality of slave stations, and performs communication by TDM system from the master station to the slave stations. In a satellite communication control system that performs communication by TDMA from the slave station to the master station, the amount of transmission signal from the slave station is monitored, and when the transmission signal from the predetermined slave station exceeds a predetermined amount, or from the slave station A line that multiplex-transmits a control signal for setting a dedicated line by a continuous wave different from the TDMA line to a predetermined slave station or a slave station with a large amount of transmission data when signals on the transmission line to the master station are crowded provided supervisory control device to the master station, it is connected to the distributor and the distributor that separates the signals of the TDM line signal and the dedicated line to the slave station, TDM demodulator and dedicated for receiving the respective line signals, respectively and line demodulator, the A modulator for setting the use line, by setting the frequency of the leased line to the private line demodulator and the modulator when the control signal received and sets the dedicated line, by continuously operating the modulator the dedicated Since a control unit for transmitting data to the master station via a line is provided, the data transmission time can be shortened and the system can easily cope with traffic fluctuations.
[0022]
In the satellite communication control system of the present invention, since the communication from the slave station to the master station is the CDMA system, the data transmission time can be shortened as in the case of the TDMA system, and the system can cope with traffic fluctuations. Becomes easy.
[0023]
In the satellite communication control system of the present invention, when the line monitoring and control device detects an increase in the amount of communication signals between the slave stations, a bidirectional dedicated line using a continuous wave is assigned to the slave station. The dedicated line can be automatically set and the communication delay between the slave stations can be improved.
[0024]
In the satellite communication control system according to the present invention, the slave station that has transmitted data through the assigned dedicated line releases the dedicated line when the data transmission is completed or the data transmission amount of the dedicated line decreases. At the same time, since the fact is notified to the line monitoring control device, the dedicated line can be used efficiently.
[0025]
In the satellite communication control system of the present invention, the data transmission through the assigned dedicated line is monitored by the line monitoring control device, and when the slave station finishes the data transmission or the data transmission amount of the dedicated line decreases. Since the slave station is sometimes requested to open the dedicated line, the line monitoring function can be integrated into the master station, and the system can easily cope with traffic fluctuations.
[0026]
In the satellite communication control system of the present invention, since the transmission speed of the dedicated line is variable according to the data transmission amount of the slave station, the satellite frequency band can be used effectively.
[0027]
Since the satellite communication control system of the present invention has a plurality of dedicated lines, the dedicated lines can be simultaneously assigned to a plurality of slave stations.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing a state in which a dedicated line is set between a slave station and a master station in Embodiment 1 of the present invention.
FIG. 2 is a schematic diagram showing a state in which a dedicated line is set between another child station and the parent station in the first embodiment.
FIG. 3 is a schematic diagram showing a state where a bidirectional dedicated line is set between slave stations in the first embodiment.
FIG. 4 is a block diagram showing a configuration of a slave station in the first embodiment.
FIG. 5 is a schematic diagram showing a star-type satellite communication system that performs data communication between a master station and a plurality of slave stations according to a conventional TDM / TDMA scheme.
[Explanation of symbols]
1a Line monitoring and control device, 2 downlink, 3 uplink,
4a, 4b, 4c Dedicated line, 5 monitoring line,
6 TDMA / continuous operation modulator, 7 control unit, 8 TDM demodulator,
9 Dedicated line demodulator, 10 interface section, 11 distributor,
100 Communication satellite.

Claims (7)

親局と複数の子局との間及び複数の子局相互間の衛星通信回線を有し、親局から子局へはＴＤＭ方式による通信を行ない、子局から親局へはＴＤＭＡ方式による通信を行なう衛星通信制御システムにおいて、子局からの送信信号の量を監視すると共に、所定の子局からの送信信号が所定量を超えた時、あるいは子局から親局への送信回線の信号が混み合った時、ＴＤＭＡ回線とは別の連続波による専用回線を設定するための制御信号を所定の子局あるいは送信データ量の多い子局に多重送信する回線監視制御装置を親局に設け、子局にＴＤＭ回線信号と上記専用回線の信号とを分離する分配器と上記分配器に接続され、上記各回線信号をそれぞれ受信するためのＴＤＭ復調器及び専用回線復調器と、上記専用回線を設定する変調器と、上記制御信号受信時に上記専用回線復調器及び変調器に上記専用回線の周波数を設定して上記専用回線を設定すると共に、上記変調器を連続動作させて上記専用回線による上記親局へのデータ伝送を行なう制御部とを設けたことを特徴とする衛星通信制御システム。There is a satellite communication line between the master station and a plurality of slave stations and between a plurality of slave stations. Communication from the master station to the slave station is performed by the TDM system, and communication from the slave station to the master station is performed by the TDMA system. In the satellite communication control system, the amount of transmission signal from the slave station is monitored, and when the transmission signal from the predetermined slave station exceeds the predetermined amount, or the signal of the transmission line from the slave station to the master station is When the master station is crowded, a master station is provided with a line monitoring control device for multiplexing and transmitting a control signal for setting a dedicated line by a continuous wave different from the TDMA line to a predetermined slave station or a slave station having a large amount of transmission data, is connected to the distributor and the distributor that separates the signals of the TDM line signal and the dedicated line to the slave station, and TDM demodulator and dedicated line demodulator for receiving the respective line signals, respectively, said dedicated line a modulator to be set, the system When the signal is received, the dedicated line frequency is set in the dedicated line demodulator and modulator to set the dedicated line, and the modulator is continuously operated to transmit data to the master station via the dedicated line. A satellite communication control system comprising a control unit . 親局と複数の子局との間及び複数の子局相互間の衛星通信回線を有し、親局から子局へはＴＤＭ方式による通信を行ない、子局から親局へはＣＤＭＡ方式による通信を行なう衛星通信制御システムにおいて、子局からの送信信号の量を監視すると共に、所定の子局からの送信信号が所定量を超えた時、あるいは子局から親局への送信回線の信号が混み合った時、ＣＤＭＡ回線とは別の連続波による専用回線を設定するための制御信号を所定の子局あるいは送信データ量の多い子局に多重送信する回線監視制御装置を親局に設け、子局にＴＤＭ回線信号と上記専用回線の信号とを分離する分配器と上記分配器に接続され、上記各回線信号をそれぞれ受信するためのＴＤＭ復調器及び専用回線復調器と、上記専用回線を設定する変調器と、上記制御信号受信時に上記専用回線復調器及び変調器に上記専用回線の周波数を設定して上記専用回線を設定すると共に、上記変調器を連続動作させて上記専用回線による上記親局へのデータ伝送を行なう制御部とを設けたことを特徴とする衛星通信制御システム。There is a satellite communication line between the master station and a plurality of slave stations and between a plurality of slave stations, communication is performed from the master station to the slave stations by the TDM system, and communication from the slave stations to the master station is performed by the CDMA system. In the satellite communication control system, the amount of transmission signal from the slave station is monitored, and when the transmission signal from the predetermined slave station exceeds the predetermined amount, or the signal of the transmission line from the slave station to the master station is When the master station is crowded, a master station is provided with a line monitoring and control device that multiplex-transmits a control signal for setting a dedicated line by a continuous wave different from the CDMA line to a predetermined slave station or a slave station with a large amount of transmission data, is connected to the distributor and the distributor that separates the signals of the TDM line signal and the dedicated line to the slave station, and TDM demodulator and dedicated line demodulator for receiving the respective line signals, respectively, said dedicated line a modulator to be set, the system When the signal is received, the dedicated line frequency is set in the dedicated line demodulator and modulator to set the dedicated line, and the modulator is continuously operated to transmit data to the master station via the dedicated line. A satellite communication control system comprising a control unit . 回線監視制御装置が、子局間の通信信号量の増大を検出した時は、当該子局に連続波による双方向の専用回線を割り当てるようにしたことを特徴とする請求項１または請求項２記載の衛星通信制御システム。3. The line monitoring and control apparatus, when detecting an increase in the amount of communication signal between slave stations, assigns a bidirectional dedicated line by a continuous wave to the slave station. The satellite communication control system described. 割り当てられた専用回線によってデータの伝送を行なった子局は、データの伝送が終了した時、あるいは専用回線のデータ伝送量が減少した時に専用回線を開放すると共に、回線監視制御装置にその旨を通知することを特徴とする請求項１〜請求項３のいずれか１項記載の衛星通信制御システム。The slave station that has transmitted the data through the assigned dedicated line releases the dedicated line when the data transmission is completed or the data transmission amount of the dedicated line decreases, and informs the line supervisory control device of that fact. The satellite communication control system according to any one of claims 1 to 3, wherein notification is performed. 割り当てられた専用回線によるデータ伝送を回線監視制御装置によって監視し、子局が、データの伝送を終了した時、あるいは専用回線のデータ伝送量が減少した時に、当該子局に対して専用回線の開放を要求するようにしたことを特徴とする請求項１〜請求項３のいずれか１項記載の衛星通信制御システム。Data transmission on the assigned dedicated line is monitored by the line monitoring and control unit. When the slave station finishes transmitting data or when the data transmission amount of the dedicated line decreases, The satellite communication control system according to any one of claims 1 to 3, wherein the opening is requested. 専用回線の伝送速度を子局のデータ伝送量に応じて可変としたことを特徴とする請求項１〜請求項５のいずれか１項記載の衛星通信制御システム。6. The satellite communication control system according to claim 1, wherein the transmission speed of the dedicated line is variable according to the data transmission amount of the slave station. 専用回線を複数としたことを特徴とする請求項１〜請求項６のいずれか１項記載の衛星通信制御システム。The satellite communication control system according to any one of claims 1 to 6, wherein a plurality of dedicated lines are provided.
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