JP2012175239A5 - - Google Patents

Description

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 .

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.

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.

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.

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 CSC line 5), and various signal processing for IP communication is performed by this control line.

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 (14)

  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, based on a message for name resolution from an IP communication terminal connected to the slave station, the slave station generates a control signal to be transmitted by the control line and generates the control line. The satellite communication method, wherein the master station that has transmitted the master signal and received the control signal reproduces the message. 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 . A satellite GW apparatus that generates a control signal to be transmitted through the control line based on a message for name resolution from an IP communication terminal, and the control signal generated by the satellite GW apparatus to the master station through the control line A slave station comprising a satellite communication device for transmission.   The satellite GW apparatus determines from the received data from the connected IP communication terminal that the received data is a message for the purpose of name resolution from the IP communication terminal; The message processing means for generating a control signal to be transmitted by the control line based on the message when it is determined that the message is intended for name resolution from the IP communication terminal. 2. The slave station described in 2. A master station that assigns a communication line in response to a request for line assignment from a slave station by a control line that passes through a satellite, and that receives a control signal transmitted from the slave station via the control line ; And a line control device for reproducing a message for name resolution from an IP communication terminal connected to the slave station based on a control signal received by the master station satellite communication device. Bureau.   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 allocation 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 by the DNS protocol from an IP communication terminal connected to the slave station, and performs the control. The master station that transmits to the master station via the line and receives the first control signal searches the IP address of the IP communication terminal of the partner slave station that is the destination, and generates a reply to the name resolution request. The slave station that has transmitted the second control signal to the slave station via the control line and has received the second control signal reproduces the response to the name resolution request and reproduces the IP communication terminal of the counterpart slave station Feature to send to Satellite communication method for. 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 . Determining means for determining from the received data from the terminal device including the IP communication terminal that the received data is a name resolution request message by the DNS protocol from the IP communication terminal, and a name resolution request by the DNS protocol by the determining means; when it is determined that the message, the satellite GW device and, the control generated by the satellite GW apparatus having a message processing means for generating a control signal system that are sent by the control line on the basis of the name resolution request message A slave station comprising a satellite communication device for transmitting a signal to the master station via the control line. A master station that assigns a communication line to the slave station in response to a line assignment request for a communication line that performs satellite communication with a partner slave station, which is requested from the slave station by a control line that passes through the satellite, transmitted from said child station, and the master station satellite communication device a first control signal generated based on the name resolution request message according to the DNS protocol received by said control circuit, said first received by the master station satellite communication device of connected IP communication terminal to the Aiteko station that is the destination of the name resolution request message on the basis of the first control signal, a retrieving means for retrieving IP address from the search result of the search means to the name resolution request Message processing means for generating a reply message and generating a second control signal, and transmitting the second control signal to the slave station via the control line Master station was.   6. The satellite communication method according to claim 1, wherein the control line is a CSC line.   6. 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.   The slave station according to any one of claims 2, 3, and 6, wherein the control line is a CSC line.   7. 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.   8. The master station according to claim 4, wherein the control line is a CSC line.   8. The master station according to claim 4, 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 message for name resolution from an IP communication terminal connected thereto, and the satellite GW A satellite communication device that transmits the control signal generated by the device to the parent station via the control line, and the parent station receives the control signal transmitted from the child station via the control line; Based on the control signal received by the master station satellite communication device, a line control device for reproducing a message for the purpose of name resolution from the IP communication terminal connected to the slave station Satellite communication system with a.