JP2581410B2 - Routing information management method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a VSAT (Very
Small Aperture Terminals)
The present invention relates to a routing information management method applied to a satellite communication system.

[0002]

2. Description of the Related Art Conventionally, as a routing information management method in a VSAT satellite communication system, all central stations and all micro-earth stations individually store in advance all routing information for all terminals in the system. Alternatively, a routing information server that manages all routing information of the VSAT network is connected to a terrestrial network that connects the central stations, and a system that responds to an inquiry from the VSAT network has been adopted (a routing system in a VSAT satellite communication system, The method described in Japanese Patent Application No. 4-206888).

FIG. 3 is a schematic block diagram showing a routing information management system in a VSAT satellite communication system using the routing information server. In the figure, reference numeral 101 denotes a routing information server that holds address information of all VSAT systems, and a plurality of central stations 102, 106,... Are connected to the routing information server 101 by a LAN. .
.. Correspond to each of the plurality of central stations 102, 106,.
Are provided, and each of the micro earth stations 103 (107,.
.) Are connected to a large number of terminals 105 (109,...). In addition, each of the micro earth stations 103 (107,.
..) include the routing information storage device 104 (10
8, ...) are attached.

[0004] Thereby, for example, the micro earth station 103
From the terminal 105 under the control to the terminal 1 under the micro earth station 107
When communication is to be performed with the routing information server 09, the routing information server 101 is queried from the micro earth station 103 to the routing information server 101 for routing information to the micro earth station 107 to which the terminal 109 is connected. After waiting for the information, communication is performed from the micro earth station 103 to the micro earth station 107. The routing information from the routing information server 101 is stored in the routing information storage device 1 of the micro earth station 103.
04 for use in later communications.

[0005]

However, in the above-mentioned conventional routing information management system, the micro-earth station 10 is not used.
When the first communication is performed between the 3,107,..., The communication must be performed from each of the micro earth stations 103 (107,...) To the routing information server 101 without fail. Each time communication is performed, the routing information for the other station is stored in the routing information storage device 104 (1) of each station.
08,...), The number of times of communication with the routing information server 101 is small.
.. Decrease as the number of times of communication between each other increases. However, in such a system, each of the micro earth stations 103 (107,...) Manages a large number of identical routing information in a multiple manner, and the routing information storage device 104 (108,.・ ・) Inefficient use.

Further, each central station 102 (106,...)
.) And the routing information held by each of the micro earth stations 103 (107,...) Must also be consistent. In particular, when the network configuration of the VSAT satellite communication system is to be changed, the routing information in all the central stations 102, 106,... And all the micro earth stations 103, 107,. Or, it must be changed, and the operation is complicated.

[0007] The present invention has been made in view of the above problems, and can manage routing information with high reliability and efficiency. Further, even when the configuration of a network is changed, the routing information is simultaneously deleted or deleted. An object of the present invention is to provide a routing information management method that does not need to be changed.

[0008]

In order to achieve the above object, a routing information management system according to the present invention comprises a plurality of central stations, and a micro earth station connected to each central station and having a plurality of terminals, in the routing information management system for performing call setup to the called terminal from the calling terminal, both setting the default transfer between among the plurality of central stations and a plurality of central stations and a plurality of ultra-small earth station any routing information storage apparatus that manages address <br/> less information of each terminal
Provided in two or more of the central stations, further comprising, when default transfer of call setting request data from a micro earth station having the calling terminal to a central station to which the micro earth station is connected ,
At the central station provided with the routing information storage device
Performs a search for routing information for the called terminal, when could this search, the relative ultra small earth station having a called terminal, transmits a call setting request data added with the routing information Means for making the above call setting
And if the above search was not possible , or the above routine
In the central station where the routing information storage device is not provided , the call setting request data is default-transferred to another central station having a routing information storage device capable of searching for the routing information, and the called terminal is transferred from the central station. Means for performing call setting by transmitting call setting request data to which the routing information is added to the micro earth station.
Configuration to be.

[0009]

According to the routing information management method, when there is a call from the calling terminal, the call setting request data is transmitted from the micro earth station having the calling terminal to the central station to which the micro earth station is connected. Transferred by default.

The routing information storage device of the central station searches for routing information relating to the called terminal. If the search is successful, the routing information is transmitted to the micro earth station having the called terminal. The call setting request data to which the information is added is transmitted, and the call setting is performed.

If the search is not successful, the call setting request data is transferred by default to another central station having a routing information storage device capable of searching for routing information, and the central station transmits a microminiature terminal having a called terminal. Call setting request data to which routing information is added is transmitted to the earth station, and call setting is performed.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram illustrating a routing information management method according to an embodiment of the present invention. In the routing information management system of this embodiment, as shown in the figure, a plurality of central offices 1 to 3 are connected via a ground line 40, and each central office 1 (2, 3) Micro earth station 1
1-1, ~, 11-n (21-1, ~, 21-n, 31
-1,-, 31-n) are connected by a satellite line. And each micro-earth station 11-1
(11-2, ~, 11-n, 21-1, ~, 21-n,
31-1 to 31-n), a plurality of terminals are connected.

The central station 1 and the central station 2 are provided with routing information storage devices 10 and 20, respectively, and the other central station 3 is not provided with such a routing information storage device. Routing information storage devices 10 and 20
Is a device that stores a plurality of pieces of routing information as logical location information indicating where each terminal is connected in the VSAT network.

Such a routing information storage device 1
A plurality of routing information R stored in 0, 20
Is composed of a central station number, a micro earth station number, and a boat number for each terminal (terminal number), as shown in FIG. Here, the terminal number is a number uniquely assigned to a terminal in the entire system, and is the only information that allows the terminals to recognize each other. Further, each of the micro earth stations 11-1 (11-2, ..., 11-n, 21-1,.
, 21-n, 31-1,..., 31-n) As the own location information, the central station number of the central station 1 (2, 3) that supervises the reception, the micro earth station number of each station itself, and each station itself The port numbers held by each micro earth station 11-1 (11-2,
~, 11-n, 21-1, ~, 21-n, 31-1,
, 31-n).

Although such routing information is stored in the routing information storage devices 10 and 20, the routing information storage device 10 stores only the routing information relating to the terminals under the central station 1, and the routing information storage device. 20 stores routing information on terminals under the control of the central station 2 and the central station 3. Writing and erasing of routing information in the routing information storage devices 10 and 20 can be freely performed.
Alternatively, the routing information about the terminals under the central station 2 and the central station 3 may be stored, and the routing information storage device 20 may store only the routing information about the terminals under the central station 1.

Then, such central offices 1, to 3,
A default transfer destination is set between the micro earth stations 11-1, to 31-n. Specifically, the micro earth stations 11-1,..., 11-n (21-1,.
1-1, ..., 31-n), the central station 1 (2, 3)
Is specified as the default transfer destination, and the micro earth station 1
1-1, ~, 11-n (21-1, ~, 21-n, 31
-1,..., 31-n) hold the address of the central station 1 (2, 3) as the default transfer destination. Also,
For the central station 1, the central station 2 is designated as the default transfer destination. Here, the designation of the default transfer destination can be arbitrarily performed.

Here, when a call under a logical communication path is set from a terminal under a certain micro earth station to a terminal under another micro earth station, the call of each terminal, the micro earth station and the central station is made. The notification transmission / reception function will be described. In this case, as shown in FIG. 2 (b), each terminal gives a call number, its own terminal number (calling terminal number) to the micro earth stations 11-1,. ), A function of transmitting a call setting request notification S1 containing the terminal number of the called terminal (called terminal number). In addition, the micro earth station 11-
Upon receipt of the call setting request notification S1 from the calling terminal, 1, to 31-n receive the call number, called terminal number, calling terminal number, calling terminal as shown in FIG. A call setting request notification S2 is created using the position information (central station number, micro earth station number, port number) as information, and this call setting request notification S2 is transmitted to the central stations 1, to 3 via a satellite line. It has the function to do.

When the central station 1 receives the call setting request notification S2 from the micro earth station, the routing information storage device 10 stores the routing information (the number of the central station, the number of the micro earth station) to the called terminal. (Call number, port number) and transmits a predetermined call setting request notification. Specifically, when the central office 1 can search the routing information to the called terminal, as shown in FIG. 2D, the called terminal routing information which is a blank part of the call setting request notification S2. It has a function of transmitting a call setting request notification S3 in which the central station number, micro earth station number, and port number of the called terminal are inserted into the micro earth station that controls the called terminal. Also, the central station 1 has a function of transferring the call setting request notification S2 to the central station 2, which is the default transfer destination, when the routing information to the called terminal cannot be searched.

The central station 2 receiving the call setting request notification S2 searches the routing information storage device 20 for the routing information of the called terminal and transmits the routing information to the subordinate called terminal in the same manner as the central station 1. It has a function of transmitting a call setting request notification S3 to the called terminal under the central station 3 via the station 3.

Call setting request notification S3 from central stations 1, to 3
Receives the call setting request notification S1 containing the call number and the calling terminal number to the called terminal, as shown in FIG. It has a function to make settings. As shown in FIG. 2 (e), the micro earth station controls the routing information to the calling terminal and the micro earth station itself, as shown in FIG. It also has a function of returning a call setting completion notification S4 containing the routing information to the called terminal to the micro earth station that controls the calling terminal.

Then, the micro earth station which has received the call setting completion notice S4, based on the call setting completion notice S4, stores the call number and the called terminal number as shown in FIG. Has been transmitted to the calling terminal. The micro earth station that controls the calling terminal and the called terminal also has a function of storing routing information corresponding to the call number.

Next, the operation of the routing information management system of this embodiment will be described. First, the micro earth station 11-
The terminal 13 under the control of one to the terminal 13 of the micro earth station 11-n
A case where a call is set as a logical communication channel will be described.

First, from the calling terminal 12 to the micro earth station 11
-1, a call setting request notification S1 having a call number, a calling terminal number which is a terminal number of the calling terminal 12, and a called terminal number which is a terminal number of the called terminal 13 is transmitted. You.
Then, the call setting request notification S1 is sent to the micro earth station 11-.
1, the call number, the called terminal number which is the number of the called terminal 13, and the calling number which is the number of the calling terminal 112 which is the calling terminal number in the micro earth station 11-1. A call setting request notification S2 having the terminal number, the number of the central station 1, the number of the micro earth station 11-1 and the port number is created, and the default call is transmitted to the central station 1.

In the central station 1, the received call setting request notification S
With the called terminal number, which is the number of the called terminal 13 of No. 2 as a key,
The routing information storage device 10 retrieves the routing information to the called terminal 13, and transmits a call setting request notification S3 carrying this routing information to the micro earth station 11-n.

The micro earth station 11-n notifies the called terminal 13 of the call number and the calling terminal number which is the number of the calling terminal 12 based on the received call setting request notification S3. The call setting between the call terminal 12 and the called terminal 13 is performed. Further, the micro earth station 11-n has the routing information to the calling terminal 12 indicated in the call setting request notification S3 and the routing information to the called terminal 13 controlled by the micro earth station 11-n. The call setting completion notification S4 is sent to the calling terminal 1
2 is sent back to the micro-earth station 11-1 that controls the system. In the micro earth station 11-1, the transferred call setting completion notification S
4, a call setting completion notification S5 containing the call number and the called terminal number, which is the number of the called terminal 13, is called from the calling terminal 1.
2 so that the calling terminal 12 and the called terminal 13
Is completed.

Next, a case where a call is set from the terminal 12 under the control of the micro earth station 11-1 to the terminal 32 under the control of the micro earth station 31-n will be described. In this case, the operations up to the calling terminal 12, the micro earth station 11-1, and the central station 1 are the same as in the above case. That is, the call setting request notification S1 is sent from the calling terminal 12 to the micro earth station 11-1.
And transmitted from the micro earth station 11-1 to the central station 1 from the call setting request notification S2.

However, since the routing information storage device 10 of the central station 1 does not hold the routing information for the called terminal 32 as described above, the routing information cannot be searched. Therefore, the central station 1 transfers the call setting request notification S2 to the central station 2 as the default transfer destination. The central station 2 searches the routing information storage device 20 for routing information to the called terminal 32 using the called terminal number of the transferred call setting request notification S2, that is, the number of the called terminal 32, as a key. A call setting request notification S3 is transmitted to the micro earth station 31-n via the station 3.

The processing in the micro earth station 31-n is the same as described above. That is, the micro earth station 31-
In n, the call number and the calling terminal number, which is the number of the calling terminal 12, are notified to the called terminal 32 based on the received call setting request notification S3, and the call setting with the called terminal 32 is performed. Further, in the micro earth station 31-n, the call setting completion notification S4 having the routing information to the calling terminal 12 indicated in the call setting request and the routing information to the called terminal 32 of the micro earth station 31-n. Is returned to the micro earth station 11-1 having the calling terminal 12. As a result, in the micro earth station 11-1, the transferred call setting completion notification S4
, The called terminal number, which is the number of the called terminal 32, is notified to the calling terminal 12, and the call setting between the calling terminal 12 and the called terminal 32 is completed.

It should be noted that the present invention is not limited to the above-described embodiment, and various modified patterns are configured for the routing path by a combination of the contents of the routing information storage devices 10 and 20 and the designation of the default transfer destination. Of course, you can do that.

[0030]

As described above, according to the routing information management method of the present invention, the routing information for any one terminal can be centrally managed by any one of the routing information processing devices, so that the routing information is highly reliable. And it can be managed efficiently. Thus, even when the network configuration of the VSAT satellite communication system is changed, it is not necessary to delete or change the routing information all at once. Furthermore, the search of the routing information and the transfer processing when the search fails are processing only at the time of call setup, so that data routing after call setup is performed in the shortest route from the calling terminal to the called terminal. In other words, it is possible to reduce the time for the search processing and the like.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a routing information management method according to an embodiment of the present invention.

FIG. 2 is a diagram showing routing information and notification information;
FIG. 2A shows an example of the routing information stored in the routing information storage device, and FIG. 2B shows a call setting request from the calling terminal to the micro earth station or from the micro earth station to the called terminal. FIG. 2 (c) shows a call setting request notification from the micro earth station to the central station, FIG. 2 (d) shows a call setting request notification from the central station to the micro earth station, FIG. 2 (e) shows a call setting completion notification between the micro earth stations,
FIG. 2F shows a call setup completion notification from the micro earth station to the calling terminal.

FIG. 3 is a block diagram showing a routing information management method according to a conventional example.

[Explanation of symbols]

 1, ~, 3 Central station 10, 20 Routing information storage device 11-1, ~, 31-n Micro earth station 12, 13, 32 Terminal S1, ~, S3 Call setting request notification S4, S5 Call setting completion notification

Claims (2)

(57) [Claims] 1. A routing information management system comprising a plurality of central stations and a micro earth station connected to each central station and having a plurality of terminals, wherein a call setup from a calling terminal to a called terminal is performed. both setting the default transfer between among the plurality of central stations and a plurality of central stations and a plurality of ultra-small earth stations, each
The routing information storage apparatus for managing address information of the terminal further provided any two or more of the central stations, the call setup request to the central station the miniature earth station from ultra small earth station having the calling terminal is connected Transfer data by default
If that, in the central station provided with the routing information storage device
Performs a search for routing information for the called terminal, when could this search, the relative ultra small earth station having a called terminal, transmits a call setting request data added with the routing information Means for making the above call setting
If the above search could not be performed , or if the above routing information
In the central station not provided with the information storage device, the call setting request data is transferred by default to another central station having a routing information storage device capable of searching for the routing information, and the central station has the called terminal. Means for transmitting the call setting request data to which the routing information is added to the micro earth station to perform the call setting. 2. The routing information management method according to claim 1, wherein the routing information stored in the routing information storage device is changed to change the pattern of the routing route.