JP2014175935A - Satellite communication system control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to transmit and receive data to and from a desired communication object using a satellite communication system effectively even at the time of increase in communication demand in a time of large scale disaster and the like.SOLUTION: In a control method of first and second satellite communication systems that transmit and receive data between satellite communication earth stations via a communication satellite by control of their respective control earth stations, a satellite communication earth station belonging to the first satellite communication system makes a line connection with a satellite communication earth station belonging to the first satellite communication system via the communication satellite by the record of a radio resource table and a satellite routing table held by it, obtains information necessary to update the radio resource table and information necessary to update the satellite routing table from the control earth station in the second satellite communication system, updates the radio resource table and the satellite routing table (S207), and thereby switches a line connection object to a satellite communication earth station in the second satellite communication system.

Description

The present invention relates to a control method for a satellite communication system, and relates to a two-way communication system via a communication satellite such as a VSAT (Very Small Aperture Terminal) system. A satellite communication line is established with a VSAT earth station belonging to the satellite communication system.
About.

  Conventionally, a plurality of bidirectional communication systems using communication satellites have been operated. In the VSAT system which is such a bidirectional communication system, VSAT earth stations (child stations, satellite communications) installed in various places under the control of a VSAT control earth station (master station, hereinafter referred to as a HUB station). Earth station) is connected via a communication satellite. Also, for example, a public telecommunication network is connected to the VSAT earth station. As a result, various information communication devices connected to the public telecommunication network can send and receive data to and from various communication targets via the VSAT earth station connected via the communication satellite.

  With regard to such a communication system, Patent Document 1 discloses that a routing management server is provided as an upper node of VSAT to manage routing information in the VSAT network for all terminals, and if necessary, routing information is transmitted from this routing management server to VSAT. A method of managing routing information with high reliability and efficiency by acquiring and updating the information at the earth station is disclosed.

JP-A-6-053878

  By the way, some VSAT earth stations are portable, and in a VSAT system equipped with a large number of portable VSAT earth stations, in the event of an emergency such as a large-scale disaster, or when a specific event is held, it will be compared to normal times. There is a tendency for communication demand to increase and the usage rate of communication satellites to increase significantly. Thus, in this type of satellite communication system, when such communication demand increases, there is a risk of congestion occurring in the satellite band used by the satellite communication system.

  Here, when congestion occurs in the satellite band, it becomes difficult for the HUB station to allocate a satellite line in response to a communication request from the VSAT earth station to the HUB station in the first satellite communication system where the congestion has occurred. . As a result, in the VSAT earth station, it is difficult to perform data communication via a communication satellite, and there is a problem that it is difficult to perform data communication with a desired communication target. Such a situation may occur even in a second satellite communication system different from the first satellite communication system, in which congestion does not occur in the satellite communication band and there is sufficient bandwidth. Occur.

  The present invention has been made in consideration of the above points. Even when communication demand increases (when traffic increases) during a large-scale disaster or the like, a desired communication target and data can be obtained by effectively utilizing a satellite communication system. The purpose is to be able to send and receive.

(1) In the control methods of the first and second satellite communication systems in which data is transmitted and received between satellite communication earth stations via communication satellites under the control of the control earth station,
The satellite communication earth station belonging to the first satellite communication system is:
The line connection is established via the communication satellite with the satellite communication earth station belonging to the first satellite communication system based on the recorded radio resource table and satellite routing table.
Information necessary for updating the radio resource table and information necessary for updating the satellite routing table are acquired from the control earth station of the second satellite communication system, and the radio resource table and the satellite routing table are updated. Thus, the line connection target is switched to the satellite communication earth station of the second satellite communication system.

  According to (1), information necessary for updating the radio resource table and information necessary for updating the satellite routing table are obtained from the control earth station of another satellite communication system, and the radio resource table, satellite By updating the routing table, even if it is difficult to allocate a line due to congestion of the satellite band, failure of the control earth station, etc., the information necessary to update the radio resource table, the satellite routing table is simply updated. By simply processing to acquire necessary information and update the table, data can be transmitted and received by effectively using the configuration of another satellite communication system. As a result, even when traffic increases during a large-scale disaster or the like, even when congestion occurs in the satellite band, the satellite communication system can be used effectively to send and receive data to and from the desired communication target. it can.

(2) In (1),
Information required to update the radio resource table
It is at least beacon information and satellite control line information related to the communication satellite of the second satellite communication system.

  According to (2), the satellite communication system can be used effectively even when there is congestion in the satellite band even when traffic increases due to a large-scale disaster or the like due to a more specific configuration. A desired communication target and data can be transmitted and received.

(3) In (1) or (2),
The information needed to update the satellite routing table
A communication satellite address for connecting to a satellite line related to the second satellite communication system using at least an IP address, an address of a satellite communication earth station for outgoing / incoming calls, and a terminal address for outgoing / incoming calls

  According to (3), the satellite communication system can be used effectively even when there is congestion within the satellite band even when traffic increases due to a large-scale disaster, etc., due to a more specific configuration. A desired communication target and data can be transmitted and received.

  ADVANTAGE OF THE INVENTION According to this invention, even when the communication demand increases at the time of a large-scale disaster etc., a desired communication object and data can be transmitted / received effectively using a satellite communication system.

1 is a diagram showing a VSAT system according to a first embodiment of the present invention. It is a figure which shows the example of a routing between VSAT in the VSAT system of FIG. It is a figure which shows the example of a connection sequence of FIG. It is a figure which shows a satellite routing table. It is a figure which shows a radio | wireless resource table. It is a figure which shows the signal used for a connection sequence. It is a figure which shows the example of a routing between VSAT which belongs to a different satellite system. It is a figure which shows the update of a routing table. It is a figure which shows the signal used for the update of a routing table. It is a figure which shows the example of a connection sequence of FIG. It is a figure which shows the other example of the routing between VSAT which belongs to a different satellite system.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is a diagram showing a VSAT system according to the first embodiment of the present invention. In FIG. 1, a VSAT system 1 is a two-way communication system using a communication satellite 400. The VSAT system 1 is provided with VSAT earth stations 100, 200,..., And data is transmitted and received between the VSAT earth stations 100, 200,... Via the communication satellite 400 under the control of the HUB station 600. The VSAT system 2 is a two-way communication system using the communication satellite 500, and data is transmitted and received between the VSAT earth stations 300,... Via the communication satellite 500 under the control of the HUB station 700. In the following, the VSAT earth stations 100, 200, and 300 are appropriately referred to as VSATL1, VSATL2, and VSATE in the drawings. Similarly, the HUB stations 600 and 700 are expressed as HUBL and HUBE, and the communication satellites 400 and 500 are expressed as SATL and SATE. The VSAT systems 1 and 2 are referred to as a system L and a system E, respectively.

  In this embodiment, the VSAT systems 1 and 2 are connected between the VSAT earth stations 100 and 200 of the VSAT system 1 and the VSAT earth station 300 of the VSAT system 2 that is another VSAT system different from the VSAT system 1. It is configured so that a line can be connected via a communication satellite 500 according to another VSAT system 2. As a result, in this embodiment, even when congestion occurs in the satellite band of the communication satellite 400 according to the VSAT system 1 and it is difficult to assign a line to the VSAT earth stations 100 and 200, the VSAT earth is further failed due to a failure of the HUB station 600 or the like. Even when it is difficult to assign a line to the stations 100 and 200, the line can be connected to a corresponding information terminal using a satellite line of another VSAT system 2. As a result, in this embodiment, even in the event of an emergency such as a large-scale disaster, even when congestion occurs in the satellite band, the satellite communication system is effectively used to transmit and receive desired communication targets and data. be able to.

  Here, the VSAT earth stations 100, 200, and 300 are antennas 101, 201, and 301 that are used for wireless communication with the communication satellites 400 and 500, respectively, and antenna control units 102 that control the attitudes and the like of the antennas 101, 201, and 301, respectively. 202, 302, IP communication modems 103, 203, 303 that perform modulation / demodulation, encoding, and decoding of IP signals used for wireless communication using the antennas 101, 201, 301, a terrestrial channel protocol, and a satellite channel protocol Data transmission adapters 104, 204, 304, and HUB stations 600, 700 that convert routing information and routing information are exchanged, and data transmission adapters 104, 204, 304, IP communication modems 103, 203, 303, Line control is performed by controlling the antenna control units 102, 202, and 302. Line controllers 105, 205, 305, personal computers (PCs) used as terminals 107, 108, 207, 208, 307, 308, VoIP telephones (TEL) 109, 110, 209, 210, 309, 310, VoIP telephones Gateway (VoIPGW) 106, 206, 306 and the like. In the following description, the functions of the line control units 105, 205, and 305 will be described as being included in the data transmission adapters 104, 204, and 304 as appropriate.

  The HUB stations 600 and 700 play a role as a satellite network control center. The HUB stations 600 and 700 are antennas 601 and 701 related to transmission and reception of radio communication waves with the communication satellites 400 and 500, and RF signals for monitoring and controlling radio communication waves transmitted and received through the satellite control line via the antennas 601 and 701. Supervisory control units 602, 702, satellite control line modems 603, 703 for executing modulation / demodulation, coding, and decoding processes related to radio communication waves transmitted / received through the satellite control line, VSAT earth stations 100, 200 using satellite control lines, It is composed of DAMA (Demand Assignment Multiple Access) 604, 704, etc. for controlling the setting of the satellite line between the VSAT earth stations 100, 200, 300 via the communication satellites 400, 500 by information transmission with the communication satellite 400, 500.

  FIG. 2 is a diagram showing routing in the VSAT system 1. The example of FIG. 2 is a case where the VSAT earth station 100 is connected to the VSAT earth station 200, and the VoIP telephone 109 accommodated in the VSAT earth station 100 makes a call to the VoIP telephone 210 accommodated in the VSAT earth station 200. An example will be described.

  In this case, the outgoing signal from the VoIP telephone 109 is converted into the IP address of the Ethernet (registered trademark) subscriber interface by the gateway 106 of the VoIP telephone and transmitted (PORTTL11). This IP address is converted by the data transmission adapter 104 into a satellite routing address with reference to the satellite routing table. Here, the satellite routing table is a table in which information necessary for executing the line connection processing in the VSAT system 1 is recorded (see FIG. 4), and each IP address constituting the satellite routing address is recorded so as to be detectable. It is a table.

  The satellite routing address is an address in which each IP address necessary for routing processing is recorded, and is configured by an address group that can specify the data transmission path from the information terminal related to transmission to the information terminal related to reception. More specifically, the satellite routing address includes fewer communication satellite addresses, outgoing / incoming VSAT addresses, and terminal addresses, and includes the address of the HUB station as necessary. Here, the communication satellite address is an address (number) specifying a communication satellite, and the outgoing / incoming VSAT address is the address (number) of the VSAT earth station related to outgoing / incoming calls. The terminal address is an address (number) of a terminal related to outgoing / incoming calls.

  In the example of FIG. 2, when the VoIP telephone 109 accommodated in the VSAT earth station 100 transmits to the VoIP telephone 210 accommodated in the VSAT earth station 200, the data transmission adapter 104 using the satellite routing table is used. As a result of the processing, the IP address becomes the address of the communication satellite 400 (SATL number) + the address of the HUB station 600 (HUBL number) + the address of the VSAT earth station 100 related to outgoing (VSATL1 number) + the address of the VSAT earth station 200 related to incoming ( VSATL2 number) + address of VoIP telephone 109 relating to outgoing call (TEL 109 number) + address of VoIP telephone 210 relating to incoming call (TEL 210 number). This satellite routing address is transmitted as a line setting request signal to the HUB station 600 by the satellite control lines 801 and 802 via the IP communication modem 103, the antenna 101, and the communication satellite 400.

  Upon receiving this line setting request signal, the HUB station 600 receives the satellite routing address included in this line setting request signal, and transmits the setting signal for the line 901 to the VSAT earth station 100 using the satellite control lines 801 and 802. At the same time, a setting signal for the line 902 corresponding to the designation to the VSAT earth station 100 is transmitted to the VSAT earth station 200 using the satellite control lines 802 and 803.

  By receiving this setting signal, the VSAT earth stations 100 and 200 are connected by lines 901 and 902, and the address of the communication satellite 400 (SATL number) + the address of the VSAT earth station 100 related to the transmission (VSATL1 number) + Transmission information including satellite routing address including at least the address of the VSAT earth station 200 related to the incoming call (VSATL2 number) + the address of the VoIP telephone 109 related to the outgoing call (TEL109 number) + the address of the VoIP telephone 210 related to the incoming call (TEL210 number) Is transmitted from the VSAT earth station 100 via the lines 901 and 902.

  In the VSAT earth station 200, the outgoing information is sequentially input to the data transmission adapter 204 via the antenna 201 and the IP communication modem 203, where the satellite routing address included in the outgoing information is converted into an IP address and VoIP. The incoming signal is sent to the telephone gateway 206 and sent to the VoIP telephone 210. When the VoIP telephone 210 responds to the incoming call, communication between the VoIP telephone 109 and the VoIP telephone 210 is started via the lines 901 and 902.

  FIG. 3 is a diagram showing a connection sequence according to the routing of FIG. In S 101, the VoIP telephone 109 makes a call to the VoIP telephone 210, thereby transmitting a transmission signal (1) with an IP address including the number of the VoIP telephone 210 to the data transmission adapter 104 in S 102. In S103, the transmission signal (1) is received by the data transmission adapter 104, and in the subsequent S104, the satellite routing table is referred to convert the IP address into a satellite routing address. The satellite routing address is converted into the satellite routing address in S105 by the transmission signal (2). It is sent to the modem 103 for IP communication.

  FIG. 4 is a diagram showing an example of the satellite routing table. FIG. 4A is an example of the VSAT system 1, and for the VSAT system 1 (system 1), an address (SAT number) SATL for identifying the corresponding communication satellite is recorded, and the VSAT accommodated in this communication satellite. Addresses VSATL1 and VSATL2 for identifying VSAT earth stations 100 and 200 are recorded in the earth station number (VSAT number). The addresses TEL109 and TEL110 of the VoIP telephones 109 and 110 and the addresses PC107 and PC108 of the personal computers 107 and 108 are recorded in the accommodation terminal number of the VSAT earth station 100, and the VoIP telephones 209 and 209 Addresses TEL209 and TEL210 of 210 and addresses PC207 and PC208 of personal computers 207 and 208 are recorded.

  As shown in FIG. 4B, in the case of the VSAT system 2, an address (SAT number) SATE for identifying a communication satellite related to the VSAT system 2 is recorded, and the address of the VSAT earth station accommodated in this communication satellite ( The address VSATE for identifying the VSAT earth station 300 is recorded in (VSAT number). In addition, the addresses TEL309 and TEL310 of the VoIP telephones 309 and 310 and the addresses PC307 and PC308 of the personal computers 307 and 308 are recorded in the accommodation terminal number of the VSAT earth station 300.

  In the example of FIG. 3, when the VoIP telephone 109 accommodated in the VSAT earth station 100 makes a call to the VoIP telephone 210 accommodated in the VSAT earth station 200, the VoIP telephone 210 related to the incoming call is received from this satellite routing table. A number TEL210 is detected, a VSAT address VSATL2 and a communication satellite address SATL relating to the number TEL210 are detected, a satellite routing address is generated, and this satellite routing address is sent to the IP communication modem 103 by a transmission signal (2). .

  The IP communication modem 103 receives this transmission signal (2) in S106. The IP communication modem 103 searches the radio resource table from the number of the communication satellite 400 based on the satellite routing address included in the transmission signal (2). Here, the radio resource table is a table in which information that can use the satellite control line related to the corresponding communication satellite is recorded. Specifically. Examples of VSAT systems 1 and 2 are shown in FIGS. 5 (A) and 5 (B), respectively, for beacon communication satellites 400 and 500, beacon frequency numbers FBL and FBE for identifying beacon frequencies, Satellite control line frequency numbers FCL and FCE for specifying the frequencies of the corresponding satellite control lines 801 and 811 (see FIG. 7) are recorded.

  The IP communication modem 103 detects the beacon frequency associated with the communication satellite 400 and the frequency of the satellite control line with the communication satellite 400 by searching the radio resource table. The modem 103 for IP communication receives the radio communication wave with the detected beacon frequency by the antenna 101 under the control of the antenna control unit 102 and executes the satellite tracking process, and the antenna 101 in the direction in which the beacon reception level becomes maximum. Is localized. This antenna tracking process is executed with reference to information such as the azimuth and elevation angle of the communication satellite 400 as necessary.

  When the beacon reception level becomes maximum in this way, the IP communication modem 103 sends a line setting request to the communication satellite 400 using the satellite control line frequency detected by searching the radio resource table. This line setting request signal is sent to the HUB station 600.

  In HUB station 600, this line setting request signal is received in S107, and by analyzing this line setting request signal, incoming VSAT earth station 200 is detected from the satellite routing address included in this line setting request signal. Further, based on the detection result, the satellite lines 901 and 902 used for data transmission / reception between the VSAT earth stations 100 and 200 are selected.

  In the subsequent S108, the HUB station 600 transmits a line setting signal to the VSAT earth stations 100 and 200, and notifies the frequency of the satellite line selected in S107 using the line setting signal using the satellite control lines 801, 802, and 803. To do. In response to this notification, the VSAT earth station 100 receives the line setting signal in S109, and the antenna control unit 102 is set to transmit and receive a radio communication wave at the frequency of the received line. Subsequently, in S110, the VSAT earth station 100 transmits the transmission signal (2) through the set line.

  In VSAT earth station 200, the line setting signal transmitted from HUB station 600 is received in S111, and in subsequent S112, setting is performed by antenna control unit 202 so that a radio communication wave is transmitted and received at the frequency of the received line. Subsequently, in S113, the transmission signal (2) transmitted from the VSAT earth station 100 is received through the set line. Upon reception of the transmission signal (2), the IP communication modem 203 transmits an activation signal to the data transmission adapter 204 in S114.

  In S 115, the data transmission adapter 204 receives this activation signal, generates an IP address from the satellite routing address notified by this activation signal, and transmits an incoming signal to the VoIP telephone 210. The VoIP telephone 210 receives this incoming signal in S116, and then sends an incoming response signal to the data transmission adapter 204 in S117. The data transmission adapter 204 receives the incoming response signal at S118 and sends the incoming response signal to the IP communication modem 203. The IP communication modem 203 receives the incoming response signal at S119 and uses the line 902 to receive the VSAT earth signal. An incoming call response signal is transmitted to the IP communication modem 103 of the station 100. The IP communication modem 103 of the VSAT earth station 100 receives this incoming response signal in S121 and relays it to the data transmission adapter 204. The data transmission adapter 204 receives the incoming response signal in S122 and receives the incoming call to the VoIP telephone 109. Relay the response signal. Thereby, the VoIP telephone 109 receives the incoming response signal in S123 and enters the communication state.

  FIG. 6 is a diagram showing a transmission signal and the like related to the series of processes. The outgoing signal (1) (S102) related to the outgoing call from the VoIP telephone 109 is composed of type information indicating the information type and an incoming IP address which is an IP address for identifying the incoming VoIP telephone 210. A transmission signal (2) (S105) relating to transmission from the data transmission adapter 104 is composed of type information and a satellite routing address. Similarly, the line setting request signal (S106) transmitted from the VSAT earth station 100 is composed of type information and a satellite routing address. The line setting signal (S108) transmitted from the HUB station 600 is composed of type information, a satellite routing address number, and a line frequency number that specifies the frequency of the satellite line selected as the data transmission / reception target. The activation signal (S114) transmitted from the IP communication modem 203 is composed of type information and a satellite routing address. The incoming signal (S115) sent from the data transmission adapter 204 and the incoming response signal (S117) sent from the VoIP telephone 210 are composed of an information type and an IP address that identifies the VoIP telephone 210.

  FIG. 7 is a diagram showing the routing when the VSAT earth station 1 related to the VSAT system 1 is connected to the VSAT earth station 300 related to another VSAT system 2 in comparison with FIG. The example of FIG. 7 will be described based on an example in which the VoIP telephone 109 accommodated in the VSAT earth station 100 makes a call to the VoIP telephone 310 accommodated in the VSAT earth station 300. Note that the radio resource table and the satellite resource table necessary for this routing are updated in advance by the processing described later.

  In this case, the outgoing signal from the VoIP telephone 109 is converted into the IP address of the Ethernet subscriber interface by the gateway 106 of the VoIP telephone and sent (PORTTL11). This IP address is converted by the data transmission adapter 104 into a satellite routing address with reference to the satellite routing table. In this example, since the VoIP telephone 109 accommodated in the VSAT earth station 100 makes a call to the VoIP telephone 310 accommodated in the VSAT earth station 300, the IP address is the address (SATE number) + HUB of the communication satellite 500. The address of the station 700 (HUBE number) + the address of the VSAT earth station 100 related to the call (VSATL1 number) + the address of the VSAT earth station 300 related to the call (VSATE number) + the address of the VoIP telephone 109 related to the call (TEL 109 number) + It is converted into a satellite routing address having at least the address (TEL 310 number) of the VoIP telephone 310 related to the incoming call. This satellite routing address is transmitted as a line setting request signal to the HUB station 700 by the satellite control lines 811 and 812 via the IP communication modem 103, the antenna 101, and the communication satellite 400.

  Upon receiving this line setting request signal, the HUB station 700 receives the satellite routing address included in this line setting request signal, and transmits the setting signal for the line 911 to the VSAT earth station 100 using the satellite control lines 811 and 812. At the same time, a setting signal for the line 912 corresponding to the designation to the VSAT earth station 100 is transmitted to the VSAT earth station 300 using the satellite control lines 812 and 813.

  By receiving this setting signal, the VSAT earth stations 100 and 300 are connected by lines 911 and 913, and the address of the communication satellite 500 (SATE number) + the address of the VSAT earth station 100 related to the transmission (VSATL1 number) + Transmission information including satellite routing address including at least the address of the VSAT earth station 300 related to the incoming call (VSATE number) + the address of the VoIP telephone 109 related to the outgoing call (TEL 109 number) + the address of the VoIP telephone 310 related to the incoming call (TEL 310 number) Is transmitted from the VSAT earth station 100 via the lines 911 and 913.

  In the VSAT earth station 300, the outgoing information is sequentially input to the data transmission adapter 304 via the antenna 301 and the IP communication modem 303, where the satellite routing address included in the outgoing information is converted into an IP address and VoIP. The incoming signal is sent to the gateway 306 of the telephone and sent to the VoIP telephone 310. When the VoIP telephone 310 responds in response to this incoming call, communication between the VoIP telephone 109 and the VoIP telephone 310 is started via the lines 911 and 912.

  FIG. 8 is a flowchart showing the update process of the routing table (radio resource table, satellite resource table). In the VSAT earth station 100, for example, by an operator input using a maintenance terminal, the identification information (system ID) of the VSAT system 2, the IP address of the HUB station 700, the IP address of the VSAT earth station 100 is sent to the HUB station 700 in S 201. A satellite system entry registration signal having at least an address, an IP address of the VSAT earth station 300, and an entry period is transmitted. The satellite system entry registration signal is transmitted using a fixed line on the ground.

  In S202, the HUB station 700 receives this satellite system entry registration signal and records the information set in this entry signal. In this record, when the entry period set in the entry signal elapses, the record is quickly deleted. This record is used to respond to a satellite system entry registration signal from another VSAT earth station 200, and to update a satellite routing table of a VSAT earth station belonging to the VSAT system 2 of the HUB station 700.

  Subsequently, in step S204, the HUB station 700 notifies information necessary for updating the satellite routing table and the radio resource table. More specifically, the HUB station 700 includes the identification information of the VSAT system, the satellite control line frequency number of the VSAT system 2, the beacon frequency number of the communication satellite 500, the address of the communication satellite 500, the address of the HUB station 700, the VSAT system 2 A satellite system entry permission signal having at least an address for identifying a VSAT earth station belonging to the ID and an address of an information terminal accommodated in each VSAT earth station is transmitted to the VSAT earth station 100 using a fixed land line or the like. . The address of the communication satellite 500, the address of the HUB station 700, and the address specifying the VSAT earth station belonging to the VSAT system 2 are addresses for connection within the VSAT system 2. In place of such transmission / reception of the satellite system entry registration signal and satellite system entry permission signal via a fixed land line, a specific satellite line may be allocated for maintenance and transmitted / received using this maintenance line.

  The maintenance terminal receives the satellite system entry permission signal in S205, the VSAT system identification information set in the satellite system entry permission signal, the satellite control line frequency number of the SAT system 2, the beacon frequency number of the communication satellite 500, A satellite system ID setting signal based on the address of the communication satellite 500, the address of the HUB station 700, the address specifying the VSAT earth station belonging to this VSAT system 2, and the address of the information terminal accommodated in this VSAT earth station, respectively, in S206 The data is transmitted to the data transmission adapter 104. In step S207, the data transmission adapter 104 updates the satellite routing table and the radio resource table in accordance with the satellite system ID setting signal.

  FIG. 9 is a diagram showing each signal used in the processing of FIG. The satellite system entry registration signal is composed of information type, VSAT system identification information (system IDE), HUB station 700 IP address, VSAT earth station 100 IP address, VSAT earth station 300 IP address, and entry period. In the example of FIG. 9, the satellite system entry permission signal is information identification, VSAT system identification information (system IDE), satellite control line frequency number of VSAT system 2, beacon frequency number of communication satellite 500, communication satellite 500 An address (SATE number) and an address of the HUB station 700 are provided. Further, the address of the VSAT earth station belonging to the VSAT system 2 and the address of the information terminal accommodated in the VSAT earth station are recorded for each VSAT earth station, and the entry period is recorded. As for the satellite system ID setting signal, information identification is set. Similarly to the satellite system entry permission signal, the VSAT system identification information (system IDE), the satellite control line frequency number of the VSAT system 2, the beacon frequency number of the communication satellite 500, The address of the communication satellite 500, the address of the HUB station 700, the address of the VSAT earth station 100, the address of the VSAT earth station 300, and the address of the information terminal are assigned.

  FIG. 10 is a diagram showing a connection sequence according to the routing of FIG. 7 in comparison with FIG. In S201, the VoIP telephone 109 makes a call to the VoIP telephone 310, and in S302, a transmission signal (1) with an IP address including the number of the VoIP telephone 310 is transmitted to the data transmission adapter 104. In S303, the transmission signal (1) is received by the data transmission adapter 104. In the subsequent S304, the IP address is converted into a satellite routing address by referring to the satellite routing table. This satellite routing address is used for IP communication by the transmission signal in S305. It is sent to the modem 103. The IP communication modem 103 receives this transmission signal in S306, searches the radio resource table by the satellite routing address included in this transmission signal, executes the satellite tracking process, and the beacon reception level is maximized. The antenna 101 is localized in the direction.

  When the beacon reception level is maximized in this way, the IP communication modem 103 sends this line setting request to the communication satellite 400 using the satellite control line frequency detected by the search of the radio resource table. A request signal is sent to the HUB station 600. In the HUB station 600, this line setting request signal is received in S307, and the VSAT earth station 300 related to the incoming call is detected. Also, based on the detection result, a satellite channel for data transmission / reception between the VSAT earth stations 100 and 300 is selected, and in S308 and S311, a line setting signal is transmitted to the VSAT earth stations 100 and 300, respectively. The frequency of the satellite line selected in S307 is notified by the signal. With this notification, the VSAT earth station 100 receives this line setting signal in S309, and the antenna control unit 102 is set to transmit / receive a radio communication wave at the frequency of the received line. Subsequently, in S310, the VSAT earth station 100 transmits the transmission signal (2) through the set line.

  In VSAT earth station 300, the line setting signal transmitted from HUB station 700 is received in S311, and in subsequent S312, the radio communication wave is set to be transmitted and received by the frequency of the received line. Subsequently, in S313, the transmission signal (2) is received through the set line, and in S314, the activation signal is transmitted from the IP communication modem 303 to the data transmission adapter 304.

  In S <b> 315, the data transmission adapter 304 receives this activation signal, generates an IP address from the satellite routing address, and transmits an incoming signal to the VoIP telephone 310. The VoIP telephone 310 receives this incoming signal in S316, and then sends an incoming response signal to the data transmission adapter 304 in S317. The data transmission adapter 304 receives the incoming response signal in S318 and sends the incoming response signal to the IP communication modem 303. The IP communication modem 303 receives the incoming response signal in S319 and uses the line 903 to receive the VSAT earth signal. An incoming call response signal is transmitted to the IP communication modem 103 of the station 100. The IP communication modem 103 of the VSAT earth station 100 receives this incoming response signal in S331 and relays it to the data transmission adapter 304. The data transmission adapter 304 receives the incoming response signal in S333 and receives the incoming call to the VoIP telephone 109. Relay the response signal. As a result, the VoIP telephone 109 receives the incoming response signal in S323 and enters the communication state.

  FIG. 11 is a diagram showing the routing when the VSAT earth stations 100 and 200 of the VSAT system 1 use the communication satellite 500 of the other VSAT system 2 together. In the example of FIG. 11, as described above with reference to FIG. 7, the VSAT earth stations 100 and 200 sequentially execute the routing table update processing described with reference to FIG. 8 to update the satellite routing table and the radio resource table, respectively. To do. Thereby, various data can be transmitted and received between the two VSAT earth stations 100 and 200 belonging to the VSAT system 1 as in the case where no abnormality has occurred in the communication satellite 400.

  According to the above configuration, information necessary for updating the radio resource table and information necessary for updating the satellite routing table are obtained from the control earth station of another satellite communication system, and the radio resource table, satellite By updating the routing table, even if it is difficult to allocate a line due to congestion of the satellite band, failure of the control earth station, etc., the information necessary to update the radio resource table, the satellite routing table is simply updated. By simply processing to acquire necessary information and update the table, data can be transmitted and received by effectively using the configuration of another satellite communication system. As a result, even when traffic increases in a large-scale disaster or the like, even if congestion occurs in the satellite band, it is possible to effectively use the satellite communication system to send and receive data with a desired communication target. .

Other Embodiment
The specific configuration suitable for the implementation of the present invention has been described in detail above. However, the present invention can be variously combined with the above-described embodiment without departing from the spirit of the present invention. Various configurations can be changed.

  That is, in the above-described embodiment, a case has been described in which each VSAT system includes a communication satellite. However, the present invention is not limited to this, and can be widely applied to a case where a plurality of VSAT systems share a communication satellite.

1, 2 VSAT system 100, 200, 300 VSAT earth station 101, 201, 301, 601, 701 Antenna 102, 202, 302 Antenna control unit 103, 203, 303 IP communication modem 104, 204, 304 Data transmission adapter 105, 205, 305 Line control unit 106, 206, 306 VoIP gateway 107, 108, 207, 208, 307, 308 Personal computer 109, 110, 209, 210, 309, 310 VoIP telephone 400, 500 Communication satellite 600, 700 HUB station 602 702 RF monitoring control 603 703 Satellite control line MODEM
604, 704 DAMA

Claims (3)

In the first and second satellite communication system control methods for transmitting and receiving data between satellite communication earth stations via communication satellites under the control of each control earth station,
The satellite communication earth station belonging to the first satellite communication system is:
The line connection is established via the communication satellite with the satellite communication earth station belonging to the first satellite communication system based on the recorded radio resource table and satellite routing table.
Information necessary for updating the radio resource table and information necessary for updating the satellite routing table are acquired from the control earth station of the second satellite communication system, and the radio resource table and the satellite routing table are updated. Thus, the satellite communication system control method for switching the line connection target to the satellite communication earth station of the second satellite communication system. Information required to update the radio resource table
The control method of the satellite communication system according to claim 1, wherein at least beacon information and satellite control line information relating to a communication satellite of the second satellite communication system. The information needed to update the satellite routing table
The communication satellite address for connecting to the satellite line related to the second satellite communication system using at least the IP address, the address of the satellite communication earth station for outgoing / incoming calls, and the terminal address for outgoing / incoming calls. The control method of the satellite communication system according to claim 2.

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