JP2012195670A5

JP2012195670A5 -

Info

Publication number: JP2012195670A5
Application number: JP2011056542A
Authority: JP
Filing date: 2011-03-15
Publication date: 2014-03-27
Anticipated expiration: 2031-03-15

Description

このＤＡＭＡシステムにおいて、ＤＮＳを行なう場合の従来例を図８に基づいて説明する。まず、子局２が親局１に対して回線接続要求を発し、親局１はこの回線接続要求に基づいて子局２に通信回線の割当を行なう。子局２はこの割当られた通信回線により、親局１のＤＮＳサーバ装置に対して相手子局２に接続されたＩＰ通信端末のアドレスを照会するＤＮＳプロトコルによる名前解決要求メッセージを送信する。子局２はＤＮＳプロトコルによる名前解決要求の回答を受信して、ＩＰ通信端末からのＩＰデータを相手ＩＰ通信端末に送信するための回線接続要求を親局１に発し、親局１はこの回線接続要求に基づいて子局２と相手子局２との間に通信回線を割当て、通信回線を接続する。子局２はこの割当てられた通信回線により、ＩＰデータを相手子局２のＩＰ通信端末に送信する。 A conventional example in the case of performing DNS in this DAMA system will be described with reference to FIG. First, the slave station 2 issues a line connection request to the master station 1 , and the master station 1 allocates a communication line to the slave station 2 based on the line connection request. The slave station 2 transmits a name resolution request message based on the DNS protocol for inquiring the address of the IP communication terminal connected to the partner slave station 2 to the DNS server device of the master station 1 through the assigned communication line. Slave station 2 receives the answer name resolution request by the DNS protocol, emits IP data from the IP communication terminal to the master station 1 a line connection request to transmit to the partner's IP communication terminal, the master station 1 is the line A communication line is allocated between the slave station 2 and the partner slave station 2 based on the connection request, and the communication line is connected. The slave station 2 transmits the IP data to the IP communication terminal of the partner slave station 2 through the assigned communication line.

そこで、発明者らはＤＮＳプロトコルの名前解決要求メッセージに対する処理を制御回線（ＣＳＣ回線）で行なうことにより、通信回線の利用効率を高めることを提案した。図９はＣＳＣ回線を用いたＤＮＳプロトコルによる名前解決要求メッセージに対する処理を表す処理シーケンス図である。
まず、子局２に接続されたＩＰ通信端末がＤＮＳ要求のメッセージを発し、このメッセージを子局２の衛星ＧＷ装置によりＣＳＣ回線で送信できる制御信号に変換し、親局１に送信する。親局１は受信した制御信号からメッセージを再生し、ＤＮＳサーバ装置により名前解決要求のメッセージを検索して回答を作成し、回線制御装置でＤＮＳ回答の制御信号に変換し、子局２に送信する。子局２はＩＰ通信端末からのＩＰデータを相手ＩＰ通信端末に送信するための回線接続要求を親局１に発し、親局１はこの回線接続要求に基づいて子局２と相手子局２との間に通信回線を割当て、通信回線を接続する。子局２はこの割当てられた通信回線により、ＩＰデータを相手子局２のＩＰ通信端末に送信する。 Thus, the inventors have proposed that the processing efficiency of the communication line is increased by performing processing for the DNS protocol name resolution request message on the control line (CSC line). FIG. 9 is a processing sequence diagram showing processing for a name resolution request message based on the DNS protocol using a CSC line.
First, the IP communication terminal connected to the slave station 2 issues a DNS request message, which is converted into a control signal that can be transmitted by the satellite GW apparatus of the slave station 2 via the CSC line, and transmitted to the master station 1. The master station 1 reproduces a message from the received control signal, searches for a name resolution request message by the DNS server device, creates a reply, converts it to a DNS reply control signal by the line control device, and transmits it to the slave station 2 To do. The slave station 2 issues a line connection request for transmitting the IP data from the IP communication terminal to the partner IP communication terminal to the master station 1 , and the master station 1 determines the slave station 2 and the partner slave station 2 based on the line connection request. A communication line is allocated between and a communication line is connected. The slave station 2 transmits the IP data to the IP communication terminal of the partner slave station 2 through the assigned communication line.

図３に図示しないが、親局１の親局衛星通信装置７内には、子局２の衛星通信装置１９内の通信回線変復調部２３に相当する回路部が、また親局１内には、子局２の衛星ＧＷ装置２０に相当する装置があり、親局１に接続されるＩＰ通信端末（図示省略）、またインタフェースを介した他のネットワークの装置（図示省略）が親局１を利用して、通信衛星３を介した通信回線６により、複数の子局２に接続されたＩＰ通信端末１５等との間で通信が行えるものである。この親局１において、ＩＰ通信端末等に提供される機能を果たす回路及び装置は、子局２に備えられた構成と同じ構成のものであると考えればよい。 Although not shown in FIG. 3, a circuit unit corresponding to the communication line modulation / demodulation unit 23 in the satellite communication device 19 of the slave station 2 is included in the master station satellite communication device 7 of the master station 1. There is a device corresponding to the satellite GW device 20 of the slave station 2, and an IP communication terminal (not shown) connected to the master station 1 or another network device (not shown) via the interface By using the communication line 6 via the communication satellite 3, communication can be performed with the IP communication terminals 15 connected to the plurality of slave stations 2. In the master station 1, the circuit and the device that perform the function provided to the IP communication terminal or the like may be considered to have the same configuration as that provided in the slave station 2 .

親局１は上りＣＳＣ回線４をモニタしており、子局２から送信された回線割当要求信号を送受信機１０で受信して、ＣＳＣ回線変復調部１１で復調し、信号処理部１２に伝送して信号処理して再生する。親局１の信号処理部１２により再生された回線割当要求信号はＤＡＭＡ回線制御部１３に入力され、ＤＡＭＡ回線制御部１３はシステム専用帯域（通信システムに与えられる使用できる周波数帯域のこと）中の空き領域を検索し、空き領域に通信回線を割り当て、その中心周波数と帯域幅の情報、及び当該回線割当要求をした子局２と相手子局２とを特定する情報を含む回線割当応答信号を生成し、信号処理部１２へ出力する。回線割当応答信号は、信号処理部１２により信号処理され、ＣＳＣ回線変復調部１１により変調され、送受信機１０から下りＣＳＣ回線５により子局２へ送信される。 The master station 1 monitors the upstream CSC line 4, receives the line assignment request signal transmitted from the slave station 2 by the transceiver 10, demodulates it by the CSC line modem 11 and transmits it to the signal processor 12. Signal processing and playback. The line allocation request signal reproduced by the signal processing unit 12 of the master station 1 is input to the DAMA line control unit 13, which is in the system dedicated band (the usable frequency band given to the communication system). A line allocation response signal including a search for an empty area, an allocation of a communication line to the empty area, information on the center frequency and bandwidth, and information for specifying the slave station 2 and the partner slave station 2 that have made the line allocation request. Generate and output to the signal processing unit 12. The line assignment response signal is signal-processed by the signal processing unit 12, modulated by the CSC line modulation / demodulation unit 11, and transmitted from the transceiver 10 to the slave station 2 through the downlink CSC line 5.

子局２と相手子局２は、下りＣＳＣ回線５をモニタしており、親局１から送信された回線割当応答信号を送受信機２１で受信すると、これをＣＳＣ回線変復調部２２で復調し、信号処理部２４で再生する。信号処理部２４は親局１から割り当てられた通信回線６の中心周波数と帯域幅に通信回線変復調部２３を設定して子局２間での通信を行う。ここで割り当てられる通信回線６は子局２から相手子局２への送信回線、相手子局２から子局２への送信回線である。子局２間での通信が終了すると、子局２の伝送制御部２６にて通信終了信号が生成されて、上りＣＳＣ回線４により親局１へ送信され、親局１は割り当てていた通信回線６を開放し、システム専用帯域中の空き領域とする。 The slave station 2 and the partner slave station 2 are monitoring the downstream CSC line 5. When the channel assignment response signal transmitted from the master station 1 is received by the transceiver 21, this is demodulated by the CSC line modem unit 22. Playback is performed by the signal processing unit 24. The signal processing unit 24 sets the communication line modulation / demodulation unit 23 to the center frequency and bandwidth of the communication line 6 assigned from the master station 1 and performs communication between the slave stations 2. The communication line 6 assigned here is a transmission line from the slave station 2 to the partner slave station 2 and a transmission line from the partner slave station 2 to the slave station 2. When the communication between the slave stations 2 is completed, a transmission end signal is generated by the transmission control unit 26 of the slave station 2 and transmitted to the master station 1 via the uplink CSC line 4, and the master station 1 has assigned the communication line. 6 is freed to be a free area in the system dedicated band.

子局２間での通信は１対のＩＰ通信端末１５間で行われる場合だけでなく、当該子局２間で複数対のＩＰ通信端末１５間で行われる場合もあり、ＩＰ通信端末１５の対の増減によりデータ伝送量が増減する。データ伝送量が増減した場合には、子局２の伝送制御部２６により帯域変更要求信号を生成して上りＣＳＣ回線４により親局１に送信する。親局１は帯域変更要求信号を受信して、ＤＡＭＡ回線制御部１３にて通信回線の再割り当てを行うようにしてもよい。親局１のＤＡＭＡ回線制御部１３は回線再割当応答信号を生成して下りＣＳＣ回線５により子局２に送信し、これを受信した子局２及び相手子局２は通信周波数帯域を変更する。
このような通信回線６の再割り当てによって、システム専用帯域の柔軟な運用が行えるものである。なお、親局１が子局２との間で通信を開始する場合の回線割当は、直接親局１のＤＡＭＡ回線制御部１３で行い、回線割当応答信号を相手子局２へ下りＣＳＣ回線５により送信すればよい。 Communication between the slave stations 2 is not only performed between a pair of IP communication terminals 15 but also performed between a plurality of pairs of IP communication terminals 15 between the slave stations 2. The amount of data transmission increases or decreases with the increase or decrease of the pair. When the data transmission amount increases or decreases, the transmission control unit 26 of the slave station 2 generates a band change request signal and transmits it to the master station 1 via the uplink CSC line 4. The master station 1 may receive the band change request signal, and the DAMA line control unit 13 may reassign the communication line. The DAMA line control unit 13 of the master station 1 generates a line reassignment response signal and transmits it to the slave station 2 via the downlink CSC line 5, and the slave station 2 and the partner slave station 2 that have received this change the communication frequency band. .
Such reallocation of the communication line 6 enables flexible operation of the system dedicated band. When the master station 1 starts communication with the slave station 2, the line assignment is performed directly by the DAMA line control unit 13 of the master station 1, and a line assignment response signal is sent to the partner slave station 2 and the CSC line 5 May be transmitted.

実施の形態２．
次にこの発明の実施の形態２における衛星通信方法、子局及び親局、衛星通信システムを説明する。
実施の形態１の発明は、ＩＰ通信端末１５によるＩＰ通信のための各種処理信号を送受信する制御回線としてＣＳＣ回線を用いていたが、実施の形態２の発明は、実施の形態１の上りＣＳＣ回線４及び下りＣＳＣ回線５の代わりに、ＣＳＣ回線及び通信回線とは別に設けた子局２および親局１間の上り及び下り制御回線（図２には図示しないが、上りＣＳＣ回線４及び下りＣＳＣ回線５に相当する。）を設け、この制御回線によりＩＰデータ通信のための各種信号処理を行なうようにしたものである。 Embodiment 2. FIG.
Next, a satellite communication method, a slave station, a master station, and a satellite communication system according to Embodiment 2 of the present invention will be described.
The invention of the first embodiment uses a CSC line as a control line for transmitting and receiving various processing signals for IP communication by the IP communication terminal 15, but the invention of the second embodiment is an uplink CSC of the first embodiment. Instead of the line 4 and the downlink CSC line 5, the uplink and downlink control lines between the slave station 2 and the master station 1 provided separately from the CSC line and the communication line (not shown in FIG. 2, but the uplink CSC line 4 and the downlink CSC line 5) Corresponding to the CSC line 5), and various signal processes for IP data communication are performed by this control line.

上りＣＳＣ回線４及び下りＣＳＣ回線５は元々ＤＡＭＡ方式を成立させる制御用の回線であり、この回線においてＩＰ通信端末によるＩＰ通信のための各種処理信号を送受信すると回線が混雑し、本来のＤＡＭＡ制御が十分に機能しなくなることも予測し得る。その場合には、ＩＰ通信端末によるＩＰ通信のための各種処理信号は、上りＣＳＣ回線４及び下りＣＳＣ回線５の代わりに、ＣＳＣ回線及び通信回線とは別に、子局２および親局１間に上り及び下り制御回線を設け、この制御回線により送受信するようにしてもよい。
上記の名前解決要求メッセージに対する名前解決要求制御信号及び応答信号をこの制御回線により子局２と親局１との間で送受信することにより、ＣＳＣ回線および通信回線においてＩＰ通信端末の接続処理が大量に発生しＤＡＭＡの回線制御機能が損なわれて通信効率が低下することを防止することができる。
The upstream CSC line 4 and the downstream CSC line 5 are originally control lines that establish the DAMA system. When various processing signals for IP communication by the IP communication terminal are transmitted and received on these lines, the lines are congested, and the original DAMA control is performed. Can also be expected to fail. In this case, various processing signals for IP communication by the IP communication terminal are transmitted between the slave station 2 and the master station 1 separately from the CSC line and the communication line, instead of the uplink CSC line 4 and the downlink CSC line 5. An uplink and downlink control line may be provided, and transmission / reception may be performed via this control line.
By transmitting and receiving the name resolution request control signal and the response signal for the name resolution request message between the slave station 2 and the master station 1 through this control line, a large amount of IP communication terminal connection processing is performed on the CSC line and the communication line. It is possible to prevent the DAMA line control function from being impaired and the communication efficiency from being lowered.

Claims

A line for requesting line assignment from a slave station to a master station by a control line via a satellite, assigning a communication line to the slave station by the master station, and performing satellite communication between the slave station and the partner slave station In the assignment-type satellite communication method, when performing IP communication between the first IP communication terminal connected to the slave station and the second IP communication terminal connected to the counterpart slave station, the first IP communication terminal When the master station detects completion of the name resolution request processing of the second communication terminal from the IP communication terminal, the master station establishes a communication line between the slave station and the partner slave station. A satellite communication method characterized by allocating.

A slave station that requests line assignment to a master station via a control line that passes through a satellite and performs satellite communication with a partner slave station via a communication line assigned by the master station, and is connected to the slave station. On the basis of the name resolution request message from the IP communication terminal, a satellite GW apparatus that generates a control signal to be transmitted through the control line, and the control signal generated by the satellite GW apparatus is transmitted to the master station through the control line. transmitted, via a communication line assigned by said master station on the basis of the answer to the name resolution request message, the satellite which transmits the IP data from the upper Symbol I P communication terminal to the connected I P communication terminal to the Aiteko station A slave station comprising a communication device.

To request line allocation from the slave station of the control line passing through the satellite, a master station for allocating a communication channel with respect to said child station, the name resolution request from the I P communication terminal connected to said child station A master station satellite that receives a control signal transmitted from the slave station based on the message through the control line and transmits a response to the name resolution request message to the slave station generated based on the control signal through the control line A master station comprising: a communication device; and a line control device that assigns a communication line between the slave station and the partner slave station based on a response to the name resolution request message .

A line for requesting line assignment from a slave station to a master station by a control line via a satellite, assigning a communication line to the slave station by the master station, and performing satellite communication between the slave station and the partner slave station In the assignment type satellite communication method, the slave station generates a first control signal to be transmitted through the control line based on a name resolution request message based on the DNS protocol from the first IP communication terminal connected to the slave station. Then, the master station that transmitted to the master station via the control line and received the first control signal searches the IP address of the IP communication terminal connected to the partner slave station that is the destination, and resolves the name and generates an answer to the request message and transmits the second control signal to said child station by the control circuit, the said child station and the Aiteko station based on the response generation to the name resolution request message Allocates a communication line, said child station receives the second control signal to reproduce the answers to the name resolution request message, the allocated communication channel to the connected IP communication terminal to the Aiteko station A satellite communication method characterized by transmitting data.

A slave station that requests line assignment to a master station via a control line that passes through a satellite and performs satellite communication with a partner slave station via a communication line assigned by the master station, and is connected to the slave station. from received data from the terminal apparatus including I P communication terminal, determining means for determining that the received data is the name resolution request message according to the DNS protocol from above Symbol I P communication terminal, and DNS protocols by the determination means when it is determined that the name resolution request message according to the generated satellite GW device and said satellite GW apparatus having a message processing means for generating a Ru control signal transmitted by the control line on the basis of the name resolution request message The received control signal is transmitted to the master station via the control line, and the control signal is updated based on the response to the name resolution request message. The communication line assigned by the parent station, children characterized by comprising a satellite communication apparatus for transmitting IP data from above Symbol I P communication terminal to the connected I P communication terminal to the Aiteko station station.

A master station that assigns a communication line to the slave station in response to a request for assignment of a communication line that performs satellite communication with a partner slave station, which is requested from the slave station by a control line passing through the satellite. A master station satellite communication device that receives the first control signal transmitted from the slave station based on the name resolution request message by the DNS protocol from the IP communication terminal connected to the slave station via the control line; and search means for searching received by the master station satellite communication apparatus of the first 1 IP communication terminal is connected to said Aiteko station is the destination of the name resolution request message on the basis of the control signal, the IP address, the search means A message processing means for generating a second control signal by generating an answer to the name resolution request message from the search result of the search result, and based on the answer to the name resolution request message And a line control unit for allocating a communication line between the slave station and the partner slave station, and transmitting the second control signal and the communication line assignment signal to the slave station via the control line. master station.

5. The satellite communication method according to claim 1, wherein the control line is a CSC line.

5. The satellite communication method according to claim 1, wherein the control line is configured by a control line provided separately from the communication line and the CSC line.

6. The slave station according to claim 2, wherein the control line is a CSC line.

6. The slave station according to claim 2, wherein the control line is configured by a control line provided separately from the communication line and the CSC line.

7. The master station according to claim 3, wherein the control line is a CSC line.

7. The master station according to claim 3, wherein the control line is constituted by a control line provided separately from the communication line and the CSC line.

A line for requesting line assignment from a slave station to a master station by a control line via a satellite, assigning a communication line to the slave station by the master station, and performing satellite communication between the slave station and the partner slave station In the assignment type satellite communication system, the slave station generates a control signal to be transmitted through the control line based on a name resolution request message from a first IP communication terminal connected thereto, and the satellite The control signal generated by the GW apparatus is transmitted to the parent station via the control line, and the first IP is transmitted via the communication line assigned by the parent station based on a response to the name resolution request message from the parent station. A satellite communication device for transmitting IP data from a communication terminal to a second IP communication terminal connected to the partner slave station, wherein the master station is transmitted from the slave station; A master station satellite communication device that receives a control signal through the control line and transmits a response to the name resolution request message to the slave station generated based on the control signal through the control line, and the master station satellite communication device. Based on the received control signal, a reply to the name resolution request message from the IP communication terminal connected to the slave station is generated, and between the slave station and the partner slave station based on the reply of the name resolution request message. A satellite communication system comprising a line control device for allocating communication lines.