JPS63179629A - Network diversity system - Google Patents

Abstract

PURPOSE:To attain the diversity with an earth station by combining a satellite line and a ground communication network so as to utilize an idle ground line. CONSTITUTION:If a satellite line 401 might be interrupted due to rainfall, an earth station 101 sets a line 601 corresponding to the quantity of communication with an earth station 102 located at the closest location from the earth station 101 by the similar procedure as the setting of a conventional earth line. Then, normal communication is ensured by the path of earth station 101- earth line 601- earth station 102- satellite line 403- communication satellite 301-satellite line 402- earth station 14 and as soon as the communication is finished, the earth line is released. Thus, it is not required to provide normally a private line and to set the earth line only when a diversity function is required and since plural earth stations are selected as alternate stations, the communication network with high reliability is built economically.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention realizes site diversity without using a dedicated line between earth stations in a satellite communication system where there is a possibility of line disconnection due to the influence of rain. It is related to the method.

(Prior Art) In the satellite communication system where there is a possibility that the line may be disconnected due to the influence of rain, as shown in FIG. The information being sent and received along the route is sent to the earth station 102 which is affected by the rain, and at the same time the earth station 101 which is located at a distance where the probability of being affected by the rain is considered to be small.
The earth station 10
2 ~ Dedicated line 201 ~ Earth station 1.01 ~ Satellite line 403 ~
Normal communication is generally maintained by a site diversity method in which transmission and reception are performed along a route from communication satellite 301 to satellite line 402 to earth station 1.03.

(Problem to be solved by the invention) With this method, the probability that the satellite line will be disconnected due to rain is very small, so the leased line is usually not used and is installed in vain. Become. Furthermore, in order to enhance the effect of site diversity, it is necessary to increase the distance between earth stations that perform diversity, which poses an economical problem.

The purpose of the present invention is to prevent the satellite line from being disconnected due to the influence of rain, and to avoid unnecessary installation of dedicated lines that are not normally used between earth stations. The objective is to economically construct a highly reliable communication network by combining lines within the network.

(Means for Solving the Problems) The present invention provides a method for using a non-diversity line as the link between the earth stations when the satellite line of a specific earth station is disconnected due to the influence of rain and a request for communication using an alternative earth station is generated. The main feature is that the line within the terrestrial communication network, which is installed for the purpose of terrestrial communication and is normally used for terrestrial communication, can be set up and canceled on demand.

In the conventional technology, two earth stations are combined, one is used during normal times and the other is used during rainy days, and a dedicated line is always prepared as a diversity line between them, but in the present invention, the terrestrial communication network The difference is that diversity is performed by temporarily setting up a line between arbitrary earth stations among a plurality of earth stations connected to the earth station.

(Example) FIG. 1 is a diagram for explaining the present invention in detail, 101-
104 is an earth station, 401 to 403 are satellite lines, 501 is a terrestrial communication network, and 601 is an earth station 101 to 403 in the terrestrial communication network.
102, 602 is a section between earth stations 101 to 103 in the terrestrial communication network, and 301 is a communication satellite.

In FIG. 1, it is assumed that there is a possibility that satellite line 401 may be disconnected due to rain in communication along a route from earth station 101 to satellite line 401 to communication satellite 301 to satellite line 402 to earth 1104. Earth station 101.

Select the earth station named ',a:' in the terrestrial communication network as an alternative station, and the earth station is affected by rain, and the connection between the earth station and the alternative station which is affected by rain is confirmed. If there is an empty line between the two lines, you can maintain the normality of communication by setting up a terrestrial line each time you need to set up a satellite line, in the same way as setting up a normal terrestrial line in that section. It is possible to ensure that

Any earth station within the terrestrial communication network can be selected as the alternative station, but as an example of a selection method, a method will be described in which the earth station closest to earth station 101 is selected.

A line 601 corresponding to the communication volume is set up between the old earth station 1 and the earth station 102 located at the closest distance, using the same procedure as setting up a normal terrestrial line, and the earth station 101 - terrestrial line 601 - Normal communication is ensured through the route from earth station 102 to satellite line 403 to communication satellite 301 to satellite line 402 to earth station 104, and the ground line is released at the same time as the communication ends. If the terrestrial line 601 is already completely occupied by other communications, or if the earth station 102 is also likely to be affected by rain, the distance from the earth station 101 is set at a point next to the earth station 102. Normal communication can be maintained by selecting an earth station 103 that is connected and has a usable ground line 602 and performing the same operation.

The effect of this is that if there is a possibility that the satellite link will be disconnected due to the influence of rain, there is no need to always set up a dedicated line that is not normally used between the earth stations that are trying to perform diversity, and It is now possible to set up the terrestrial line used for purposes other than diversity only when the diversity function is required, and it is also possible to select multiple earth stations as substitutes, making it possible to create a highly reliable communication network. It can be constructed as follows.

(Effects of the Invention) As explained below, by combining satellite lines and terrestrial communication networks, it is possible to perform diversity between earth stations by using vacant ground lines, and communication between earth stations is possible. There is no need to provide a dedicated line dedicated to diversity, and a highly reliable communication network with very little possibility of being affected by rain can be economically realized.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the present invention, and FIG. 2 is a block diagram of a conventional technique. 101.102,103,104...Earth station, 201
... Dedicated line, 301 ... Communication satellite, 40
1.402,403...Satellite line, 501...Terrestrial network, 601.602...Terrestrial line to be set up when necessary.

Claims (1)

[Claims] In a satellite communication system where lines may be disconnected due to the influence of rain, a line in a terrestrial communication network to which a plurality of earth stations are connected is used as a terrestrial line for diversity, For an earth station whose satellite line is disconnected, one of the multiple earth stations connected to the terrestrial communication network has a normal satellite line and there is an empty line between the earth station and the earth station. A network diversity method characterized in that an earth station is selected as an alternative earth station, and a diversity line is temporarily set up between the earth stations using a line in the above-mentioned terrestrial communication network.