JPS61193525A - Multiple address communication system in satellite communication - Google Patents

Abstract

PURPOSE:To attain the same terminal device constitution as outgoing and incoming sides by starting transmission of a radio wave at a different time from each incoming terminal device after the multiple address communication is finished for the outgoing terminal device, sending reply information to a transmission information channel at the incoming terminal device and stopping the transmission of the radio wave at the end of transmission of the reply information. CONSTITUTION:An outgoing terminal device 10 uses an information channel 200 to transmit multiple address information. Since receivers 31, 32,...33 of incoming terminal devices 11, 12...13 are set to the channel 200, the information sent from an outgoing terminal device 10 is received at the same time. After the incoming terminal devices 11, 12,...13 receive the multiple address information, the response for the confirmation is returned to the outgoing terminal device 10 by using an information channel 300. The time when each incoming terminal device completes the reception of multiple address information until the reply signal is sent differs from each incoming terminal device and the signal is not sent at the same time. Thus, number of receivers of the outgoing terminal device for multiple address communication is less and an OR circuit is eliminated and the constitution of the outgoing and incoming terminal devices is made equal.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a broadcast communication system using a satellite communication network.

[Conventional technology]

Satellite communication is a type of wireless communication that uses radio waves, so it is advantageous for broadcast communication in that the same information can be received at multiple points at the same time.

The connection configuration between a conventional satellite communication network and a terminal is shown in FIG. Originating terminal in communications, 11, 12
．． ..., 13 is a destination terminal in broadcast communication, 20 is a transmitter in the originating terminal 10, 21.22. ..., 23
are the destination terminals 11, 12 ., respectively. .e., the transmitter at 13, 30.40.50 the receiver at the originating terminal 10, 31.32. ..., 33 are the destination terminals 11, respectively.
The receivers 60 in the terminals 12, .

Then, from the originating terminal 10 to a plurality of other terminating terminals 11.1
2. - Sends a broadcast communication to
．． . . , 13 to the originating terminal 10.

In the broadcast communication system in satellite communication configured in this way, the information channel transmitted by the originating terminal 10 of the broadcast communication is one channel, and each of the destination terminals 11 to 13 sends a response signal to the originating terminal 10. The information channel for transmission is transmitted to the destination terminal 11.12. ..., one channel is allocated for every 13, and each destination terminal 11 to 13 sends a response signal to each destination terminal 11.
Since the transmission is performed using the information channels assigned to the information channels 1 to 13, the transmitting terminal 10 of the broadcast communication uses the OR circuit 60 to logically OR the outputs of the receivers 30, 40, and 50 of each information channel and outputs one signal. I received it all together.

[Problem that the invention seeks to solve]

In the conventional broadcast communication method for satellite communication described above, terminals constantly transmit radio waves on the assigned channel, so if the same channel is assigned to multiple terminals, interference will occur and communication will not be possible. .12. ...
, 13, it was necessary to allocate a different information channel to each destination terminal.

As described above, in conventional broadcast communication, it is necessary to allocate a plurality of information channels for response signals, and the originating terminal 10 has receivers 3G, 40 .
There is a drawback that an OR circuit 60 is required to combine the 50 and 50 into one.

[Means for solving problems]

In view of the above points, the present invention has been made in order to solve such problems and eliminate such drawbacks.The present invention has the object of making it possible to make the response signal of broadcast communication into one information channel, and also to The number of lines used can be reduced, the number of receivers at the sending terminal of broadcast communication can be reduced, and the OR circuit can be eliminated, and the configuration of the terminals on the sending and receiving sides of broadcast communication can be reduced. The object of the present invention is to provide a broadcast communication system in satellite communication that can make the same information.

In order to achieve such an objective, the broadcast communication system in satellite communication of the present invention provides that each destination terminal has means for matching its received information channel number with the transmitted information channel number of the originating terminal, and means for matching the channel number with the reception information channel number of the originating terminal; means for stopping the transmission of radio waves for the transmission information channel; and means to start transmitting radio waves at different times, transmit response information to the transmission information channel of the destination terminal, and stop transmitting the radio waves when transmission of the response information is completed.

[Effect]

In the present invention, the satellite communication network is connected to the originating terminal and each destination terminal through different signal channels, and selects one or more channels from available information channels according to requests from the originating terminal and each destination terminal. It selects a plurality of channels and uses the signal channel to notify each terminal.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 is a block diagram showing an embodiment of a broadcast communication system in satellite communication according to the present invention, and shows an example of a connection structure between a satellite communication network and a terminal.

In FIG. 1, the same reference numerals as in FIG. 2 indicate corresponding parts, 30, 31, 32, .・e・.

33 are the originating terminal 10 and the terminating terminal 11 and 12, respectively.
,..., 13 receivers, 100 and 101, 102
..., 103 are the satellite communication network 1, the originating terminal 10 and each destination terminal 11, 12, '---, 13, respectively.
The signal channel 200 is an information channel transmitted by the originating terminal 10, and is also an information channel received by each of the destination terminals 11 to 13. 300 is the originating terminal 1
0 receives information on the channel, and each destination terminal 1
It is also an information channel transmitted by channels 1 to 13.

The satellite communication network 1 connects the originating terminal 10 and each destination terminal 11, 12, and 13 with signal channels 100 and 1, respectively.
01, 102, . . . , 103, and selects one channel or a plurality of channels from the available information channels according to a request from the terminal, and notifies the terminal using the signal channels 100 to 103. It is configured.

Next, regarding the operation of the embodiment shown in FIG. 1, when a certain terminal, for example, the originating terminal 10, communicates with another terminating terminal 11, 12, .
. . , 13 will be explained step by step.

First, an example of a procedure for connecting an information channel will be described.

(1) The originating terminal 10 transmits a call request for broadcast communication to the satellite communication network 1 using the signal channel 100.

For a call request, the identification number of the called terminal (11, 12°-
--, 13) are included.

(2) The satellite communication network 1 transmits to the originating terminal 10 a transmission information channel number (information channel) 200 and a receiving information channel number (information channel) 300 for response reception to the originating terminal 10 using the signal channel 100. Notice.

(3) The originating terminal 10 sets the channel of the transmitter 20 to the transmission information channel 20G. Also, the channel of the receiver 30 is tuned to the incoming information channel 30G.

(4) The satellite communication network 1 is connected to the destination terminals 11, 12. ....

13, respectively, signal channels 101, 102 .・
. . , 103 are used to notify the broadcast communication reception instruction, the channel number (information channel) 200 to which the destination terminal should receive, and the transmission channel number (information channel) 300 for sending a response.

(5) Destination terminals 11, 12. ..., 13 are receivers 31, 32, . . . , 13, respectively. ..., channel 33 is matched with the information channel 200, and the transmitters 21 and 22°s*a
, 23 to the above-mentioned information channel 300, and signal channel 1 indicates that the preparation for reception of broadcast communication is complete.
01, 102, . . . , 103 to notify the satellite communication network 1.

(6) The satellite communication network 1 uses the signal channel to notify each terminal of the completion of connection.

Next, the procedure for broadcast communication will be explained.

(7) The originating terminal 10 transmits broadcast information using the information channel 200.

(8) Each destination terminal 11.12. . . , 13 are receivers 31, 32 . . . , 13, respectively. . . , 33 is tuned to channel 200, so that the information sent by the originating terminal 10 is received at the same time.

(9) Each destination terminal 11.12. . . 13 receives the broadcast information, and then returns a response to the originating terminal 10 for confirmation using the information channel 300. Incidentally, the time from when each destination terminal completes receiving the broadcast information until it transmits a response signal is a different value for each destination terminal, and the messages are not transmitted at the same time.

Qω destination terminal 11.12. . . , 13 starts transmission when it is time to return a response, and stops transmission when transmission is completed. It is assumed that no radio waves are emitted from each destination terminal while the terminal is stopped.

aυSince the originating terminal 10 sets the channel of its receiver 30 to the information channel 300, each destination terminal 11, 12, .
. . , 13 can be received in order.

Next, a procedure for releasing an information channel will be explained.

When the α4 originating terminal 10 receives the response signal, it uses the signal channel 100 to transmit information to the satellite communication network 1 via the information channel 20.
0, requesting release of 300.

The α-ken satellite communication network 1 notifies each terminal of the release of the information channel using its respective signal channel.

In the above procedure, (1) to (6) show an example of the procedure for establishing an information channel connection, and the above procedure is not necessarily followed. In short, the calling channel number of the calling terminal 10 and the receiving channel number of the receiving terminals 1112゜..., 13 are combined, and the receiving channel number of the calling terminal 10 and the receiving channel number of the receiving terminals 11, 12゜..., 13 are combined. It is only necessary to match the outgoing channel numbers of the two, and procedures other than the above procedure may also be used.

Further, the above-mentioned steps α-3 are steps for releasing an information channel, and the above-mentioned steps are not necessarily followed.

In short, it is sufficient to return to the state before performing step (1), so procedures other than the above-described procedure are also possible.

As a means of shifting the time in step (9) above,
For example, this is possible by predetermining a unique value for each terminal, or by having the originating terminal request each destination terminal using an information channel after the broadcast information is completed.

In addition, as a means of transmitting and stopping radio waves in the above step α,
Conventionally, for example, a time-division multiplexed, multipoint-connected terminal transmits radio waves only at a time position corresponding to an assigned channel number, but this time position is periodically assigned for each satellite communication frame. Therefore, radio waves are sent out periodically. However, in the present invention, when it is necessary to transmit information, radio waves are transmitted at periodic time positions, but if there is no information to be transmitted, transmission of radio waves is stopped even at the periodic time positions described above. I'll keep it.

Conventionally, in multi-point connected terminals using frequency division multiplexing, radio waves of the frequency corresponding to the assigned channel number are
However, in the present invention, radio waves are transmitted only when there is information to be transmitted, and the transmission of radio waves is stopped when there is no information to be transmitted.

〔Effect of the invention〕

As explained above, according to the present invention, each destination terminal
The reception information channel number is made to match the transmission information channel number of the originating terminal, and the transmission information channel number is made to match the reception information channel number of the origination terminal, and radio waves are transmitted to the transmission information channel. At the same time, after the originating terminal finishes broadcast communication, it starts transmitting radio waves at different times for each destination terminal, sends response information to the transmission information channel of the destination terminal, and transmits the response information. Since the transmission of radio waves is stopped when the transmission of the broadcast communication is completed, the response signal for broadcast communication can be made into one information channel, reducing the number of satellite lines used, and also It is possible to reduce the number of receivers in the originating terminal, eliminate the OR circuit, and make the configurations of the terminals on the originating side and the receiving side of broadcast communication the same, which is economically effective.

As described above, the present invention has great effects compared to conventional broadcast communication systems of this type, and is unique as a broadcast communication system using a satellite communication network.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a broadcast communication system in satellite communication according to the present invention, and FIG. 2 is a block diagram showing an example of a broadcast communication system in conventional satellite communication. 1...Satellite communication network, 10...Originating terminal, 11~
13...e destination terminal, 20-23...transmitter, 3
0 to 33...Receiver, 100 to 103...Self signal channel, 200, 300...Information channel.

Claims (1)

[Claims] Using a satellite communication network in which information channels are time-division multiplexed or frequency-division multiplexed and capable of multi-point connection, broadcast communications are transmitted from the originating terminal to multiple destination terminals, and the broadcast communications are received. In broadcast communication in which a response is sent from the destination terminal to the originating terminal using an information channel, each destination terminal has means for matching its received information channel number with the number of the originating terminal, and a means for matching its received information channel number with the number of the originating terminal, and transmitting information. means for matching the channel number with the reception information number of the originating terminal; means for stopping the transmission of radio waves to the transmission information channel; and means for each destination terminal after the originating terminal finishes broadcast communication. A system for satellite communication characterized by comprising means for starting transmission of radio waves at different times, transmitting response information to a transmission information channel of a destination terminal, and stopping transmission of radio waves upon completion of transmission of the response information. Information communication method.