JPH0358632A - Line fault relieving system for satellite communication network - Google Patents

Abstract

PURPOSE:To relieve a fault automatically and to improve the availability by recognizing a satellite link fault as a fault of a subminiature ground station for satellite communication and using a satellite communication form at in place of a ground public line network. CONSTITUTION:A satellite communication master station 4 connected to a satellite network management processor 1 is connected to a subminiature ground station 5 for satellite communication connecting to a user terminal equipment 6 via a satellite line of a communication satellite 9. When a fault takes place in a satellite line, a line switching device 3 and a user host computer 2 recognizes it as a fault of a ground station 5 and the master station 4 and the ground station 5 are connected through a MODEM 7 for public line network connection having an automatic dialing function respectively via a public line network 8 and when the satellite line is restored, the communication is switched back to the satellite communication format. Thus, while the fault is recovered, the satellite communication format is replaced automatically into the ground public line network to relieve the fault, thereby improving the availability.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is used for relief from satellite line failure in a satellite communication network. The present invention relates to an alternative data communication format using a terrestrial public line network.

〔overview〕

The present invention uses a satellite communication network fault relief system in which a satellite communication master station and a satellite communication micro-ground station perform data communication via a communication satellite, in which a satellite link failure is treated as a satellite communication micro-ground station fault. By recognizing this and replacing the satellite communication form with the terrestrial public network, failures can be automatically relieved and availability improved.

[Conventional technology]

Conventionally, there was no connection from this type of satellite line to the terrestrial public line network, and there was no remedy in the event of rain or hardware failure.

[Problem that the invention seeks to solve]

Conventionally, there was no remedy if communication was interrupted due to rain or hardware failure, so the drawback was that the availability of communication lines was low.

The present invention aims to eliminate these drawbacks, and aims to provide a system that can automatically replace the satellite communication form with a terrestrial public line network.

[Means for solving problems]

The present invention provides a line failure relief method for a satellite communication network in which a satellite communication master station connected to a satellite network management processor and a satellite communication micro-ground station connected to a user terminal perform data communication via a communication satellite. , when a failure occurs in the satellite line, a connection is automatically established between the satellite communication master station and the satellite communication micro-ground station via the public line network, and when the satellite line is restored, It is characterized by having means for automatically switching back to the satellite communication mode.

[Effect]

When a failure occurs in the satellite line, the failure is recognized as a failure of the ultra-small ground station for satellite communication, and a connection operation is made with the ultra-small ground station for satellite communication via the public line network.
Switch back to satellite communication mode when the satellite line is restored.

In this way, when a failure occurs, it is possible to automatically replace the satellite communication form with the terrestrial public line network until the failure is recovered, thereby providing relief from the failure and improving availability.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

FIG. 1 is a block diagram showing the structure of an embodiment of the present invention.

In the embodiment of the present invention, a satellite communication master station 4 connected to a satellite network management processor 1 is connected to a satellite communication micro-ground station 5 connected to a user terminal 6 via a satellite link by a communication satellite 9. Furthermore, as a feature of the present invention, when a failure occurs in the satellite line, it is recognized as a failure in the satellite communication ultra-small ground station 5, and the satellite communication master station 4 and the satellite communication ultra-compact ground station 4 are connected via the public line network 8. A line switching device 3 and a user host computer 2 are connected to a small ground station 5 via a public line network connection modem 7 each having an automatic call function, and are switched back to the original satellite communication mode when the satellite line is restored. I get jli7.

FIGS. 2(a) and 2(b) are diagrams showing the structure of a table according to an embodiment of the present invention, and an example of a case where a satellite failure occurs and is restored.

The tables are the system management table SMT and the user terminal interface device BBP in the ultra-small ground station for satellite communication.
management table BBT.

Next, the operation of the embodiment of the present invention constructed in this manner will be explained. First, automatic switching control will be explained.

When a satellite link failure is detected that indicates a state where continuity is not possible between the satellite communication master station 4 and the satellite communication microground station 5, the satellite communication master station 4 automatically connects the satellite communication microground station 5. A connection request is sent via the public line network 8. After the connection with the ultra-small ground station 5 for satellite communication during a failure is completed through this backup line, connection authentication is performed using the satellite communication master station 4 as the main body.

Connection authentication is performed using the address of the satellite communication micro-ground station 5, and after the authentication is completed by agreement between the satellite communication master station 4 and the satellite communication micro-ground station 5, the satellite network management processor 1 is notified of the connection completion. do.

Thereafter, user data and control data are transmitted through the backup line, and at this time, data entering and leaving the user port card is transferred to the dial backup port card instead of being sent to the satellite line.

The process is then carried out by operating the baseband processor management table BBT of the SYSTEM table SMT and the micro-compact ground station equipment for satellite communication.

The conditions for connection to the backup line are as follows: (i) It is assumed that the switching target micro-compact ground station 5 for satellite communication is online and a failure has occurred, and in this case, online means that the operation information ( SG).

(l1) The failure to be switched is assumed to be a failure at one station 5 of the satellite communication ultra-compact satellite recognized by the link level protocol.

(iii) The ultra-small ground station for satellite communication 5 to be switched is designated as the j0j star communication ultra-small ground station 5 to be connected by dial hunkup in the management information on the satellite communication master station 4 side.

In order to manage the status of the satellite communication master station 4, which is connected to the satellite communication ultra-compact station by dial hunkup, (i) dial-back amplifier connected (ii) dial-back amplifier connected (iii)
Define three statuses during satellite link connection.

In order to manage the ultra-small ground station 5 for satellite communication having these three statuses, a logical table (management table BBT of baseband processor BBP) in the master station 4 for satellite communication
) are linked in the order of failure of the satellite communication micro-ground station 5 to distinguish between the connected state and the waiting state. This is aimed at realizing an automatic scheduling operation function of the micro ground station 5 for communication with a faulty satellite.

The automatic scheduling operation for the dial backup line of the faulty micro-ground stations 5 for satellite communication is performed in the order in which the faulty micro-ground stations 5 for satellite communication are detected. At that time, the satellite communication master station 4
It is generally considered that the number of dial backup lines that can be prepared on the side is limited.

Under these constraint conditions, in order to prevent failure of multiple micro-ground stations 5 for satellite communication, a waiting queue for the base hand processor management table BBT is created on the logical table, and a dial pack is created after the satellite line is restored. When the dial backup port becomes vacant due to the completion of the upload, the ultra-small ground station 5 for satellite communication in a standby state is connected to the backup line using this vacant port.

Next, automatic failback will be explained. When the satellite line is restored in the ultra-small ground station 5 for satellite communication connected to the backup line, the master station 4 for satellite communication automatically switches back from the backup line to the satellite line.

In the cut-back operation, the satellite communication master station 4 and the satellite communication micro-ground station 5 perform a link-level disconnection operation of the backup line while maintaining synchronization through the hack-up line.

Assuming that a satellite line restoration operation is performed periodically from the satellite communication master station 4 to the satellite communication micro-ground station 5 during data communication on the backup line, if the satellite line is restored by continuing this operation. The switching back from the backup line to the satellite line is performed as follows: (1) When the satellite line is restored (that is, when the satellite communication micro-ground station 5 is able to receive the satellite line establishment request from the satellite communication master station 4) The satellite communication micro-ground station 5 opens a transmission channel to the satellite communication master station 4 and returns a response to the satellite line establishment request.

(2) Next, the satellite communication master station 4 and the satellite communication ultra-small land.”
A cutting S ninja is performed in 5 minutes of one game. Then, the satellite communication master station 4 transmits a backup line disconnection request to the satellite communication micro-ground station 5 through the backup line, and the satellite communication micro-ground station 5 returns a response. Disconnection authentication is a procedure for relieving the accumulated data of 9 between the satellite communication master station 4 and the satellite communication ultra-small ground station 5, and has no particular meaning. This is synchronization between link level control programs.

(3) The satellite communication master station 4 disconnects the link level upon receiving the disconnection authentication response from the satellite communication micro-ground station 5. The Ijin satellite communication master station 4 transfers data to the satellite line.

(4) The satellite communication micro-ground station 5 recognizes that the dial backup has been completed by detecting that the link level disconnection operation on the satellite communication master station 4 side is completed, and thereafter transmits data to the satellite line. Start the transfer.

〔Effect of the invention〕

As explained above, according to the present invention, by recognizing a satellite link failure as a failure of a micro-sized ground station for satellite communication, it is possible to automatically replace the satellite communication form with the terrestrial public line network and improve availability. There is an effect that can be done.

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[Brief explanation of drawings]

FIG. 1 is a block diagram showing the structure of an embodiment of the present invention. FIGS. 2(a) and 2(b) are diagrams showing an example of a table structure according to an embodiment of the present invention, and a case where a satellite failure occurs and a case where the satellite is restored. 1...Satellite network management processor, 2...User host computer, 3...Line switching installation, 4.
... Master station for satellite communication, 5... Ultra small ground station for satellite communication, 6... User terminal, 7... Model l for connection to public line network, 8... Public line network, 9... ··satellite. 1 1 Japanese Patent Application Publication No. 3-58632 (6)

Claims (1)

[Claims] 1. A satellite communication network in which a satellite communication master station connected to a satellite network management processor and a satellite communication micro-ground station connected to a user terminal perform data communication via a communication satellite. In the line failure relief method, when a failure occurs in the satellite line, a connection is automatically established between the satellite communication master station and the satellite communication micro ground station via the public line network, and the satellite line is restored. A line fault relief method for a satellite communication network, characterized by having a means for automatically switching back to a satellite communication mode when recovery is restored.