JPH05206914A - Communication system between satellite communication networks - Google Patents

Abstract

PURPOSE:To set communication connection between satellite communication networks which make communication by a DAMA system through a communication satellite to be one hop, to considerably reduce and speed up communication delay time and to prevent a device scale becoming huge and reliability from being deteriorated. CONSTITUTION:Plural satellite communication network groups using the communication satellite 1 and a network (1) 10-1 to a network (M) 10-M respectively have plural terminal stations 1-1 to 1-n and M-1 to M-n, and hub stations 1H-MH as the hub stations of the respective networks. A data network instead of a public telephone line network connects the central DAMA controllers in the hub stations in the respective networks by the data network, it has a call/on-hook function of the central DAMA controller in the other network and establishes communication between the two networks by one hop of a satellite channel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inter-satellite communication network communication system, and more particularly to an inter-satellite communication network communication system using a DAMA (demand allocation multiple access) system.

[0002]

2. Description of the Related Art Conventionally, satellite communication networks using the DAMA method have one central DA in one network.
The MA control device is provided and is connected to other networks using a public telephone line network.

FIG. 4 shows a conventional configuration example.

The conventional configuration example shown in FIG. 4 is a satellite communication 1
, A plurality of M networks (1) 10-1 networks (2) 10-2, ... Networks (M) 10-M communicating via the satellite communication 1, and a public telephone line network 3.

In addition, each network is a hub.
Stations 1H to MH and n terminal stations 1-1 to 1-n, respectively.
, 2-1 to 2-n, ..., M-1 ... Mn.

Now, referring to FIG. 4, the network (1) 10-
A case where the terminal station 1-2 of No. 1 and the terminal station 10-2 of the network (2) 10-2 communicate with each other will be described as an example.

In the network (1) 10-1, the terminal station 1-
2 calls the hub station 1H, the hub station 1H calls the hub station 2H of the network (2) 10-2 through the public telephone line 3, and the hub station 2H calls the terminal station 2-2. By performing the above three-stage processing, the terminal station 1-2 and the terminal station 2-2 are connected through the public telephone line 3 via the communication satellite 1 twice.

[0008]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In a satellite communication network using the MA method, communication is managed only within one closed network,
The only way to connect to other networks is to connect via a public telephone line. Therefore, when trying to perform inter-network communication, a double hop via a communication satellite is required twice, resulting in a large satellite delay. Therefore, there is a drawback that it has a system property that is difficult to use.

An object of the present invention is to eliminate the above-mentioned drawbacks and provide a communication system between satellite communication networks using the DAMA system, which enables communication between satellite communication networks with a single hop.

[0010]

The inter-satellite communication network communication system according to the present invention has a central DAMA control device, and communicates via a communication satellite under a demand allocation multiple access between a plurality of satellite communication networks. Communication method,
A call origination / termination processing function that is connected to the central DAMA controller of each of the plurality of satellite communication networks and enables terminal-based communication between the plurality of satellite communication networks with one satellite channel hop. And a data network having

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

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

The embodiment shown in FIG. 1 comprises a plurality M of satellite communication networks (1) 10-1 to (M) 10-M and a data network 4, and each network has a hub. Stations 1H to MH are arranged, and each has n
, Terminal stations 1-1 to 1-n, 2-1 to 2-n, ..., M-1
~ M-n are arranged.

FIG. 2 is an explanatory diagram showing an example of communication between network terminal stations in the embodiment of FIG. 1, and FIG. 3 is a diagram showing a signal sequence in the communication of FIG. The operation of this embodiment will be described below with reference to FIGS.

From the terminal 1-2 of the network (1) 10-1 in FIG. 1 to the terminal 2-2 of the network (2) 10-2.
An example is when a call is made to.

Terminal 1-2 of network (1) 10-1
To send a call request signal S1 to the hub station 1H of the own network using CSC-1 (common control signal channel).

Upon receiving the call request signal S1, the central DAMA control device 5-1 of the hub station 1H decodes the call request signal S1 and the desired communication partner is the terminal station 2-of the network (2) 10-2. Then, the notification signal S2 for notifying the common control signal channel (CSC-2) for the network (2) 10-2 is sent to the calling terminal station 1-2.

In response to this, the terminal station 1-2 matches the transmission / reception frequency with CSC-2, and sends the call request signal S3 again to the hub station 2H.

Central DAMA controller 5-2 of hub station 2H
At this point, the call request signal S3 is decoded, the idle call channel for the network 2 is selected, and the call channel notification signals S4, 5 are sent to the calling terminal station 1-2 and the called terminal station 2-2. The two stations thus received tune the frequency to the notified call channel, so that the call state in which the call signals S6, 7 are used between the terminal stations 1-2 and 2-2 is secured.

When the call ends, the end signal S8 is sent from the terminal station 1-2 to the hub station 2H of the network (2) 10-2. Further, the terminal station 2-2 also sends an end signal S9.

Hub station 2H which received the end signals S8 and S9
The central DAMA control device 5-2 returns to the initial state by sending back the call end confirmation signals S10 and S11 to both end stations.

Terminal station 1-2 of network (1) 10-1
Then, when receiving the call end confirmation signal S10 from the network (2) 10-2, the call end signal S12 is sent again to the hub station 1H of the network (1) 10-1 and the central DAMA control device 5-of the hub station 1H is sent. The end state is notified to 1 and the end state confirmation signal S13 from the hub station 1H is received to return to the initial state.

Each network is usually operated and managed independently of each other, and addition, deletion, change, etc. of terminal stations are independently performed. For this reason, direct connection between networks was normally impossible, but the central DAMA control devices of each network were connected by the data network 4 to exchange these system data (addition, deletion, change, etc. of terminal stations). By doing so and adding calling / terminating processing with another network, communication can be performed across the networks.

[0024]

As described above, according to the present invention, the central DAM control devices of each satellite communication network are connected by a data network, and the central DAM of other satellite communication networks are connected.
A communication between the satellite communication networks can be performed by using the satellite channel 1 by adding a call origination / termination processing function with the A control device.
There is an effect that the satellite delay can be minimized by going by hop.

Further, by performing a plurality of satellite communication networks by one central DAMA control device, there is an effect that the device becomes huge and the deterioration of reliability is significantly suppressed.

Further, the information exchange via the data network is only required when the system is changed, and is not necessary in the normal operation. The connection procedure is remarkably simplified as compared with the conventional telephone line, and the speeding up can be secured. is there.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an example of communication in the embodiment of FIG.

3 is a diagram showing a communication sequence in the communication example of FIG.

FIG. 4 is a configuration diagram of a conventional communication system between satellite communication networks based on the DAMA system.

[Explanation of symbols]

1 Communication Satellite 1-1 to Mn Terminal Station 1H to MH Hub Station 3 Public Telephone Network 4 Data Network 10-1 to 10-M Network (1) to Network (M)

Claims (1)

[Claims] 1. Each has a central DAMA controller,
A communication method between a plurality of satellite communication networks that communicate via a communication satellite under a request allocation multiple access, wherein the plurality of satellite communication networks are connected to the central DAMA control device included in each of the plurality of satellite communication networks. Terminal channel-based communication between communication networks, satellite channel 1
A communication system between satellite communication networks, characterized by comprising a data network having a call processing and a call end processing function that can be performed at a hop.