JPH02156737A - Line connection system for satellite communication system - Google Patents

Abstract

PURPOSE:To always and surely acquire an opposite subscriber for the execution of communication by discriminating a resident place of an opposite subscriber from storage information of a subscriber information storage means and applying connection control of a satellite line to acquire a subscriber terminal equipment corresponding to the resident place. CONSTITUTION:A subscriber registers an earth station number of a moving destination and a subscriber terminal number to a subscriber information registration memory 3a of a control station AA1 while corresponding them to its own ID number. When a call by a subscriber, the earth station number and the terminal number corresponding to the ID number are read from the memory 3a to connect the line. Thus, even when a called subscriber moves anywhere or the caller subscriber does not no the moving destination, the caller subscriber surely acquires the opposite subscriber to make a call.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a line connection method used to connect subscribers in a satellite communication system.

(Conventional technology) In recent years, with the development of communication technology and the increase in communication needs, various communication systems have been developed or proposed, including a system for making calls between subscriber terminals via communication satellites. . FIG. 5 shows an example of the configuration. This system connects a large number of subscriber terminals C such as telephones and facsimile machines to an earth station A via an exchange B, and connects a plurality of such earth stations A1 to The subscriber terminals C1 to Cn can communicate with each other by connecting the terminals An via a communication satellite S. Many of these systems use line connection request allocation (Dema) as a satellite line allocation method.
nd AssignrAent Multiple＾c
cess) method is adopted. In this method, a certain number of satellite lines held by the repeater of communication satellite S are pooled in common at each earth station, and each time a call occurs, an empty satellite line in the common pool is assigned to the corresponding earth station. This satellite line assignment control is performed by, for example, one specific earth station called a control station.

In such a system, it is assumed that the earth station A1 is the control station, and in this state, for example, when a subscriber at subscriber terminal C2 makes a call with a subscriber at subscriber terminal CB, the subscriber After going off-hook at C2 and confirming the die-dial tone DT from exchange B2, first dial the satellite line special number (for example, number 99) as shown in FIG. Then, exchange B2 outputs an activation signal to the line control device of the corresponding earth station A2 to notify that a call has been made, and from then on, the communication between the calling terminal C2 and this line control device is in a through state. shall be. In this state, when the subscriber dials in the identification number of earth station A3 and the other terminal number corresponding to the other subscriber's terminal CB, the line control device of earth station A2 connects the common signal line to earth station A1, which is the control station. A capture signal is sent through the satellite, thereby requesting a satellite link. Then, the line control device of the control station becomes
Search for a currently vacant line among the satellite lines in the pool, and select SCP C (Slngle Channel).
(PerCarrier) system, the frequency of the above-mentioned vacant line is transmitted to each earth station A2. Notify each line control device of A3. In the case of TDMA (time division multiple access), the time slot of an idle line is notified by a line designation signal.

When the satellite line is specified, the earth station A2 on the calling side sends a continuity test tone (3850H2) to the earth dependent 3 on the called side through this satellite line, thereby ensuring that the satellite line is connected. Check whether it can be operated. When the satellite line is normal and a continuity test tone is returned from the called earth station A3, the control station is notified of this using a channel conduction signal, and the called earth station A3 Transfer the other party's terminal number. In contrast, earth station A3 on the called side
When the continuity test tone is sent from the calling side, it returns the continuity test tone and outputs an activation signal to exchange B3. This puts the exchange B3 in a state of waiting for the arrival of the subscriber terminal number, and when the terminal number is transferred from the calling side earth station A2 in this state, it sends an incoming signal to the corresponding subscriber terminal CB.

When the subscriber responds to this call by going off-hook, the line control equipment of earth station A3
A response signal is sent back to 2. In this way, a communication path is formed between the calling side subscriber terminal C2 and the called side subscriber terminal C3, and the subscribers can talk on the phone from now on. Incidentally, when the line control device of the earth member 3 on the called side detects the off-hook, it sends a response signal to the control station to notify the call start point.

(Problems to be Solved by the Invention) However, the line connection method of such a conventional system has the following problems that should be improved.

In other words, as described above, in the conventional line connection method, when a call is made, the calling terminal sends the identification number and terminal number of the destination earth station, and the called subscriber terminal is called according to these numbers, and the call is made. I am trying to connect to the subscriber terminal on the side. . Therefore, if the desired subscriber is on a business trip from the head office to a branch office, or if the subscriber leaves his/her own terminal and moves to another location even if he/she is not at home, , the call was received to a terminal where the subscriber was not present, and it was not possible to talk to the subscriber himself.

SUMMARY OF THE INVENTION The present invention has focused on the above-mentioned circumstances and aims to provide a line connection system for a satellite communication system that can always track the subscriber and perform desired communications no matter where the subscriber is moving.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a communication satellite equipped with a repeater having a certain number of satellite lines, and a plurality of communication satellites each connected to a large number of subscriber terminals via an exchange. In a communication satellite system, in which at least one of these earth stations has the function of a control station that performs designated control of the satellite line using the line connection request allocation method, The equipped earth station is provided with subscriber information storage means for storing information representing the location of each subscriber in association with its identification information, subscriber information registration control means, and line connection control means. , when a request for registration of information representing the subscriber's identification information and his/her location is sent from the subscriber terminal, the subscriber information registration control means stores this information in the subscriber information storage means, and the state When identification information of the other subscriber is sent as a call request from the subscriber terminal, the line connection control means determines the location of this other subscriber from the information stored in the subscriber information storage means, and This system controls the connection of the satellite line in order to capture the subscriber terminal corresponding to the location.

(Function) As a result, according to the present invention, if a subscriber registers information indicating his/her whereabouts together with his/her identification information in the subscriber information storage means when he or she goes out, the subscriber can When a subscriber makes a call, the subscriber terminal corresponding to the subscriber's location will be called. Therefore, even if the subscriber on the calling side has moved, or even if he or she does not know where the other subscriber has moved, it is possible to always reliably track and communicate with the other subscriber, which is very helpful. It becomes convenient.

(Embodiment) FIG. 1 is a schematic configuration diagram of a satellite communication system to which a line connection method according to an embodiment of the present invention is applied.

In the same figure, among the earth stations AAI to AAn, the earth station AAI as a control station has an antenna 1a for the communication satellite S.
The network is comprised of a transceiver 1 that transmits and receives signals via a common signal line and a satellite line, a terminal device 2 that modulates and demodulates transmitted and received signals for each common signal line and satellite line, and a line control device 3. In addition to the normal first line connection control means whose procedure is shown in FIG. 6, the line control device 3 includes a subscriber information registration memory 3a
, subscriber information registration control means 3b, and second line connection control means 3c.

Among these, the subscriber information registration memory 3a stores information representing the location of each subscriber, that is, the earth station number and subscriber terminal number, in association with the identification number (ID number) of each subscriber, as shown in FIG. Each is something to remember. The subscriber information registration control means 3b receives information indicating the subscriber ID number and its location from the subscriber terminal c1 via the exchange B1, or from another earth station via the common signal line of the communication satellite S. When information representing the subscriber ID number and location arrives from AA2 to AAn, the information representing the location (earth station number and subscriber terminal number) is stored in the subscriber information registration memory 3a in association with the subscriber ID number. ) are memorized respectively. The second line connection control means 3c connects the subscriber terminal C1 or other earth stations AA2 to A
When only the subscriber ID number is notified from An, the earth station number and terminal number corresponding to this subscriber ID number are searched and read from the subscriber information registration memory 3a, and the satellite line is connected according to these numbers. It executes control.

On the other hand, the line control devices of the other earth stations AA2 to AAn other than the control station AAI are equipped with means for requesting registration of subscriber information in addition to control means for connection of lines. This registration request means sends the subscriber ID from the subscriber terminals 82 to Bn.
When information indicating the subscriber's location is sent together with the subscriber number, the subscriber ID number and the information indicating the location are notified to the line control device 3 of the control station AAI as a registration signal.

Next, the line connection control method of this embodiment will be explained based on the above configuration. First, when a subscriber registers his/her location, for example, at the destination subscriber terminal Cn, the subscriber goes off-hook and receives a dial tone D from the exchange Bn.
After confirming T, dial the satellite line designation number, that is, the satellite line special number (for example, 99), as shown in FIG. Then, following this satellite line special number, the own subscriber I
The user dials the D number and the terminal number of the subscriber terminal Cn as information representing the location. Then, the line control device is activated by the satellite line special number, and the line control device sends the subscriber ID number, its own earth station number, and the subscriber terminal number as registration signals to the control station via the common signal line. Notify AAI. In contrast, control station AAI
The line control device 3 registers the earth station number representing the location and the subscriber and terminal number in the subscriber information registration memory 3a in association with the subscriber ID. At this time, if the old whereabouts information corresponding to the subscriber is already registered in the subscriber information registration memory 3a, the new information is registered in place of this old whereabouts information. When the registration of the subscriber information is completed, the line control device 3 sends a registration confirmation signal back to the line control device of the earth station AAn, as shown in FIG. Then, a registration confirmation sound is sent from the line control device to the subscriber terminal that has registered, and the subscriber can thereby know that the registration has been completed.

Now, in such a state, for example, the subscriber at the subscriber terminal C2 wants to make a call with the subscriber who is moving.
As shown in the figure, it is assumed that after going off-hook, the satellite line special number (99) is dialed and the ID number of the other subscriber is further dialed. Then, the above satellite line special number (99
) activates the line control device of the earth station AA2, and this line control device notifies the control station AA of the above-mentioned subscriber ID number by means of a capture signal via the common signal line.

Then, the line control device 3 of the control station AAI first reads the earth station number and subscriber terminal number corresponding to the partner subscriber ID number from the subscriber information registration memory 3a, and uses these numbers to determine the location of the partner subscriber. to decide. Then, it searches for an empty line among the satellite lines pooled by itself, and uses the line designation signal to select the frequency of this free line from the calling side earth station AA2 and the called side earth station AAn.
Notify each of them.

Once the satellite line is specified, the calling earth station AA2
The line control device transmits and receives a continuity test tone (3850Hz) to and from the earth station AAn on the called side in order to check the status of the satellite line, as in the conventional case whose procedure is shown in Figure 6. When it is confirmed that the satellite line is normal, the line control device 3 of the control station AAI is notified of this by means of a channel conduction signal. When this communication path guiding signal arrives, the line control device 3 of the control station AAI transfers the destination terminal number to the earth station AAn on the called side via the common signal line.

On the other hand, the line control device of the called earth station AAn activates the exchange Bn upon receiving the continuity test tone, and when the above-mentioned terminal number is sent in this state, this terminal number is directly sent to the exchange Bn. Forward. As a result, exchange B
n captures the subscriber terminal Cn corresponding to the terminal number and sends out an incoming call signal, thereby calling the subscriber. At this time, the exchange Bn returns a ringback tone to the subscriber terminal C2 on the calling side via the satellite line. When the subscriber responds to the above call by going off-hook, a response signal is sent back from the called side's line control device 3 to the calling side's exchange B2, and as a result, the calling side's subscriber terminal C2
A communication path is formed between the subscriber terminal Cn on the called side and communication between the subscribers on the called side becomes possible.

In this embodiment, the subscriber associates the destination earth station number and subscriber terminal number with his/her ID number and registers them in the subscriber information memory 3a of the control station AAI.
When another subscriber makes a call using the subscriber ID number, the earth station number and terminal number corresponding to this ID number are read from the subscriber information registration memory 3a and the line is connected. The calling subscriber can reliably catch the called subscriber and make a call, no matter where the called subscriber moves or even without knowing where the called subscriber moves. Therefore, it is no longer necessary to make a call to the destination as in the past, which simplifies the operation and eliminates unnecessary acquisition of the satellite line, thereby increasing the efficiency of line utilization.

In addition, when making a call, the subscriber must include the satellite line special number and the other party's ID.
Because all you have to do is dial the number and number, the dialing process is simpler and shorter than the previous method, which required dialing the satellite line special number and then dialing the earth station number and subscriber terminal number separately. It can be done with

Note that the present invention is not limited to the above embodiments. For example, in the above embodiment, a case has been described in which one of all earth stations in the system is used as a control station, but the present invention can be similarly applied and implemented even when all earth stations are used as control stations.

Further, in the above embodiment, the case where the subscriber's destination is registered at the destination subscriber terminal has been described, but the destination may be registered at the subscriber's own subscriber terminal before moving. The destination may be registered using the subscriber terminal of the subscriber. In addition, the configuration of the subscriber information storage means, the control procedures and control contents of the subscriber information registration control means and line connection control means, etc. can be modified in various ways without departing from the gist of the present invention.

[Effects of the Invention] As detailed above, according to the present invention, an earth station having a function as a control station stores information indicating the location of each subscriber in association with its identification information. A subscriber information storage means, a subscriber information registration control means, and a line connection control means are provided. The subscriber information registration control means stores this information in the subscriber information storage means, and in this state, when identification information of the other subscriber is sent as a call request from the subscriber terminal, the line connection control means Accordingly, the location of the other subscriber is determined from the information stored in the subscriber information storage means, and the connection of the satellite line is controlled to capture the subscriber terminal corresponding to this location. It is possible to provide a line connection system for a satellite communication system that allows subscribers to always track themselves and perform desired communications no matter where they are moving.

[Brief explanation of the drawing]

1 to 4 are for explaining a line connection method in an embodiment of the present invention, and FIG. 1 is a functional block diagram showing a schematic configuration of a satellite communication system to which the method is applied;
FIG. 2 is a diagram showing an example of the configuration of a subscriber information registration memory;
Figures 3 and 4 are signal timing diagrams used to explain the operation of the system, Figure 5 is a schematic diagram showing an example of the configuration of a satellite communication system, and Figure 6 is a signal diagram used to explain the conventional line connection method. FIG. AAl...Earth station as a control station, AA2 to AAn.
...Earth station as a non-controlled station, B1-Bn...Switchboard, 01-Cn...Subscriber terminal, S...Communication satellite, 1
... Transmitter/receiver, 2... Terminal device, 3... Line control device, 3a... Subscriber information registration memory, 3b... Subscriber information registration control means, 3C... Second Line connection control means. Figure 2 Applicant's agent Patent attorney Takehiko Suzue 3 Figure Funeral map Figure 2

Claims (1)

[Claims] It is equipped with a communication satellite equipped with a repeater that has a certain number of satellite lines, and a plurality of earth stations to which a large number of subscriber terminals are connected via exchanges, and at least one of these earth stations has a line. In a communications satellite system having a function as a control station that performs designated control of satellite lines using a connection request allocation method, an earth station having the function as a control station is associated with identification information for each subscriber. subscriber information storage means for storing information representing the whereabouts of the subscriber; and when a registration request for information representing identification information and the whereabouts of the subscriber is sent from a subscriber terminal, this information is stored in the subscriber information storage means; subscriber information registration control means to be stored in the means;
When the identification information of the other subscriber is sent as a call request from the subscriber terminal, the location of the other subscriber is determined from the information stored in the subscriber information storage means, and the subscriber terminal corresponding to this location is captured. 1. A line connection method for a satellite communication system, comprising a line connection control means for controlling connection of a satellite line.