JP2968285B2 - Satellite circuit switching control method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a satellite circuit switching control system, and more particularly to a satellite for allocating a satellite line to a subscriber line using an out-channel signal such as a trunk line and an I interface for each call. The present invention relates to a call control system when a demand assignment control system is applied.

[Conventional technology]

FIG. 13 is an example of a switching network to which conventional satellite demand assignment communication is applied. Reference numeral 37 denotes a satellite subscriber terminating unit in which a satellite communication line 45 and a subscriber signal line 46 are set to the satellite earth station 42, and 38 denotes a signal which interfaces with the satellite earth station 42 and communicates with the satellite line control station 41. Local exchange with transmission / reception function, 39
Is a subscriber exchange having a function of transmitting and receiving signals to and from the transit exchange 40, and 40 is a transit exchange which interfaces with the satellite earth station 43 and has a function of transmitting and receiving signals between the satellite line control station 41 and the subscriber exchange 39. . 41 is a satellite circuit control station having a function of transmitting and receiving signals to and from the exchange, a function of managing the satellite line, and a function of centrally managing the line between each earth station and the exchange.
Is a satellite earth station that sets / cancels a satellite line and connects / disconnects a line between each earth station and the exchange and a satellite line at the request of the satellite line control station. 44 is a communication satellite, 45 is a satellite communication line, 46 is a subscriber signal line, 47 is a satellite control line set between the satellite line control station 41 and the satellite earth station and transfers control signals, and 48 is a subscriber exchange 38 , 39, a common line signal network for connecting between the transit exchange 40 and the satellite network controller 41 and transferring address signals between stations, call control signals such as response signals, and maintenance signals such as blocking, 49, 50 It is a subscriber terminal.

Referring to FIG. 13, an example of a connection procedure to which conventional satellite demand assignment communication is applied will be described.

When the subscriber terminal 49 originates a call, the satellite subscriber terminating unit 37 notifies the satellite channel control station 41 via the satellite control line 47, and the satellite channel control station 41 communicates with the satellite subscriber terminating unit 37 and the satellite earth station 42. During this time, the satellite communication line 45 and the subscriber signal line 46 are fixedly set. The call signal arrives at the local exchange 38 via the subscriber signal line 46 and the satellite earth station 42. The local exchange 38 performs a number translation, an outgoing route determination, and the like in a normal procedure, and
Paths are sequentially connected to the transit exchange 40 and the subscriber exchange 39 via 48.

[Problems to be solved by the invention]

In a switching network to which conventional satellite demand assignment communication is applied, if the transit exchange 40 has a satellite earth station 43 accessible to the communication satellite 44, the subscriber exchange 38 and the transit exchange
If satellites are used, the lines between 40 will be unnecessarily put on hold, and the network cannot be used efficiently.

When the subscriber exchange 38 determines that the outgoing route is a satellite line, the satellite line control station 41 sends out a call setting signal via the common channel signal network 48. The satellite line control station 41 sets up a satellite communication line 45 between the satellite earth stations 42 and 43 from the number translation, but the disadvantage that the communication quality deteriorates due to an increase in propagation delay due to hopping twice over the satellite line. is there.

Similarly, at the time of an incoming call, from the transit exchange 40 to the subscriber exchange 38 via the satellite circuit control station 41, and further from the subscriber exchange 38 to the satellite subscriber station via the satellite earth station 42 and the satellite communication line 45.
There is a disadvantage that it takes 2 hops to connect to 37.

The present invention eliminates and solves the disadvantages of the prior art, so that the propagation delay is not increased by a total of two hops, one hop in the subscriber system and one hop in the relay system. It is an object of the present invention to provide a line of good call quality by connecting to a subscriber line of the same in one hop. It is another object of the present invention to set up a line at the satellite earth station closest to the called subscriber and to use the network effectively.

[Means for solving the problem]

In order to achieve the above object, a first invention provides a satellite earth station for setting up a satellite communication line and a subscriber signal line between a satellite subscriber terminating unit and a satellite earth station, Line switching control network including a satellite line control station having a function of transmitting and receiving signals between satellites, a satellite line switching network including a satellite subscriber terminal accommodating a satellite demand assignment in which a signal line and a communication line such as an I interface are logically separated from each other. Wherein the subscriber's telephone line accommodating the satellite demand assignment is directly connected to a relay telephone line or a receiving subscriber line via the satellite earth station according to a destination to be received.

Further, the second invention has a satellite earth station for setting up a satellite communication line and a subscriber signal line with the satellite subscriber terminating unit, and has a function of interfacing with the satellite earth station and transmitting and receiving signals between the exchanges. In a satellite line switching network including a satellite demand assignment control including a satellite line control station and a satellite subscriber terminal accommodating a satellite demand assignment in which a signal line and a communication line such as an I interface are logically separated from each other, The satellite circuit control station has a function of requesting the setting and release of a satellite communication line, and the communication line of the subscriber accommodating the satellite demand assignment is sequentially extended and set along a relay exchange, and according to a destination to be received. And a direct connection to a relay communication line or an incoming subscriber line via the satellite earth station.

According to the first invention and the second invention, when one subscriber line accommodated in the satellite subscriber terminal has a plurality of telephone lines, it connects to different destinations corresponding to each telephone line. It is effective to have features.

[Action]

Conventionally, the subscriber system uses only the subscriber line as a demand assignment, and the subscriber and the receiving side exchange have implemented a fixed system, but in the present invention, the subscriber system communication line and signal In a system in which the lines are separated, the telephone line can be directly connected to the trunk line or the incoming subscriber line, and the signal line can be housed in a specific exchange (originating local exchange) and controlled in the same way as in the past. In the present invention, 1
Since the hop can connect to the relay system from the satellite-accommodated subscriber, the propagation delay can be halved compared to the conventional two-hop method, the call can be made without deteriorating the call quality, and the connection can be made directly to the relay system. Since it is not necessary to capture the telephone line on the ground, the equipment in the network can be provided for other calls, and the equipment in the network can be used effectively. Hereinafter, embodiments will be described with reference to the drawings.

〔Example〕

FIG. 1 is a first embodiment of a system configuration for realizing the present invention, FIG. 2 is a configuration example of a satellite subscriber termination unit for realizing this embodiment, and FIG. 3 is a realization of the embodiment. FIG. 4 is a structural example of a transit exchange for realizing the present embodiment, FIG. 5 is a structural example of a satellite circuit control station for realizing the present embodiment, and FIG. Is a block configuration example of a satellite earth station for realizing this embodiment.

 Hereinafter, this embodiment will be described with reference to the drawings.

In FIG. 1, reference numeral 1100 denotes a subscriber terminal, 2a denotes a satellite subscriber terminating unit for setting / releasing a satellite line and connecting / disconnecting a line between each earth station and an exchange according to a request from a satellite line control station, and 3a denotes a satellite earth terminal. A subscriber exchange having a function of transmitting and receiving signals between the satellite network controller 6a and each exchange via a common line signaling network, and a subscriber exchange having a function of transmitting and receiving signals to and from the relay exchange 5a. , 5a interface with the satellite earth station and via the common channel signaling network 13 the satellite circuit control station 6a
And a relay exchange having a signal transmission / reception function with each exchange. 6a is a signal transmission / reception function with each exchange via a common channel signal network 13, and a satellite communication line setting / satellite communication line 12 with each exchange via a satellite control line 12. A satellite circuit control station having a function of performing cancellation, a function of managing information necessary for setting / cancelling a satellite line, and a function of managing a use state of a line between each earth station and the exchange;
7a and 8a are for setting / setting the satellite link at the request of the satellite link control station.
A satellite earth station for releasing and connecting / disconnecting a line between each earth station and the exchange and a satellite line, 9 is a communication satellite, 10 is a satellite set between the satellite subscriber terminating unit 2a and the satellite earth stations 7a, 8a. A communication line, 11 is a subscriber signal line which is set between the satellite subscriber terminating unit 2a and the satellite earth station 7a and transfers control signals, and 12 is a satellite line control station 6a and a satellite subscriber terminating unit 2a, a satellite earth station. 7a, 8a
A satellite control line that is set during
Is the subscriber exchanges 3a and 4a, the transit exchange 5a and the satellite circuit control station.
6a is a common line signaling network for transferring call control signals such as address signals, response signals, etc. between each other.

In FIG. 2, reference numeral 14a denotes a PF unit which is a wireless transmission / reception device; 15a, a control unit for controlling each unit of a satellite subscriber termination unit; 16a, a call path control unit for setting / cancelling a call path; This is the terminal termination circuit that terminates.

In FIG. 3, reference numeral 18a denotes a control unit for controlling each unit of the local exchange, 19 denotes an exchange switch for performing a switching operation of a telephone line in accordance with an instruction from the control unit, and 2a denotes a subscriber for transmitting / receiving a signal to / from a subscriber terminating unit. Interface section, 21a is the local exchange 3
A common signal processing unit for transmitting and receiving signals between a and the satellite line control station 6a, an outgoing route translator 22a for translating outgoing routes and outgoing exchanges from address information, and 23a for subscriber data.

Reference numeral 24a in FIG. 4 denotes a control unit for controlling each unit of the transit exchange, 2
Reference numeral 5 denotes an exchange switch for performing a switching operation of a communication line according to an instruction from the control unit, 26a denotes a common line signal processing unit for transmitting and receiving signals between the exchange and the satellite line control station, and 27a denotes an output route and output from address information. An outgoing translator that translates the gate switch.

In FIG. 5, reference numeral 28a denotes a control unit for controlling each unit of the satellite line control station, 29a denotes a satellite station control unit for controlling an earth station and a satellite subscriber termination unit via a satellite control line, and 30a denotes transmission and reception of signals to and from an exchange. , A route translator for translating an outgoing exchange and an outgoing route from address information, and 32a is a gate exchange file for storing information such as idle / busy information and attributes of each line of the exchange.

Reference numeral 33a in FIG. 6 denotes a control unit for controlling each unit of the satellite earth station, 3
4a is an R unit which is a wireless transmission / reception device, 35a is a call path control unit which controls a call path in accordance with an instruction from the control unit, 36a
Is an interface unit for exchanges for transmitting and receiving signals between the subscriber and the relay exchange.

The operation of this system will be described with reference to FIGS. First, when the subscriber terminal 1 accommodated in the satellite subscriber terminating unit 2a makes a call for communication from the subscriber terminal 1 to 100, the terminal terminating circuit 17a of the satellite subscriber terminating unit 2a transmits the user / network of the terminal device. It detects a layer 1 activation signal defined by the interface and notifies the control unit 15a. The control unit 15a notifies the satellite channel control station 6a via the RF unit 14a and the satellite control channel 12 of a line allocation request for the subscriber signal line 11, based on the detection result of the activation signal.

The satellite channel control station 6a sets the subscriber signal line 11 between the subscriber terminating unit 2a and the satellite earth station 7a based on this request.
Here, the subscriber signal line can always be set.

A call signal including address information such as a telephone number from the subscriber terminal 1 is transmitted from the terminal termination circuit 17a of the satellite subscriber termination unit 2a to the R terminal.
F section 14a, RF section of satellite earth station 7a via subscriber signal line 11
The signal is received by 34a, converted into a signal specified by the subscriber interface by the exchange interface unit 36a, and transferred to the subscriber exchange.

The subscriber interface unit 20a of the local exchange 3a notifies the control unit 18a of the received call signal. The control unit 18a determines an outgoing route by indexing the outgoing route translator 22a and the subscriber data 23a from the received calling signal and calling subscriber information, and the common line signal processing unit 21a controls the common line signal network 13. A call signal including the calling / sending address information and the calling side satellite link information is transmitted to the satellite link control station 6a.

The satellite line control station 6a receives the outgoing call signal including the line information in the common line signal processing unit 30a, and controls the route translator 31a based on the outgoing / incoming address information in the signal and the outgoing side satellite line information. Index, incoming subscriber termination, incoming exchange,
Departure earth station, requesting departure exchange, gate exchange file 32a
And hunt for available lines. Based on the determined incoming and outgoing earth station and line number, the control unit 28a
a) Instruct the satellite subscriber terminator 2a and the satellite earth station 8a to set up the satellite communication line 10 via the satellite control line 12.
On the other hand, a call signal including the address information and the hunted line information is sent from the common line signal processing unit 30a to the destination exchange 5a via the common line signal network 13.

The control unit of the subscriber termination unit 2a that has received a satellite communication line setting request signal from the satellite line control station 6a via the satellite control line 12.
15a controls the communication path control unit 16a, and the control unit 33a of the satellite earth station 8a controls the communication path control unit 35a to connect the satellite communication line 10.

By processing as described above, the signal is transmitted from the satellite subscriber termination unit 2a to the subscriber signal line 11, the satellite earth station 7a, the subscriber exchange 3a, the common channel signal network 13, the satellite channel control station 6a, the common channel signal. It is routed through the network 13 and the transit exchange 5a, but the communication line is transmitted from the subscriber's satellite subscriber terminating unit 2a to the destination transit exchange 5a.
Can be directly connected without two hops.

The receiving-side intermediate exchange 5a receives the address information from the satellite circuit control station 6a and performs normal call processing. The line is connected to the incoming subscriber terminal 100, and when the subscriber terminal 100 responds, a response signal is transferred to the originating subscriber terminal 1 via each relay exchange and satellite line control station.

Next, communication from the subscriber terminal 100 to 1 is performed by using the transit exchange 5a.
Searches the outgoing route translator 27a based on the outgoing signal including the address signal from the local exchange 4a, and hunts the satellite line. Transfer to 6a.

The satellite line control station 6a receives the call signal including the line information, and the control unit 28a looks up the gate switch file 32a and the route translator 31a to search for the incoming satellite subscriber terminator, incoming switch, outgoing earth station, outgoing switch. And the Earth Station Control Unit 29
a, instructs the satellite earth station 8a and the satellite subscriber terminator 2a to set up the satellite communication line 10 via the satellite control line 12, and transmits a call signal including address information and hunted line information to a common line. The signal is sent from the signal processing unit 30a to the destination local exchange 3a via the common channel signal network 13.

The local exchange 30a looks up the outgoing route translator 22a and the subscriber data 23a based on the received call signal, obtains the position of the subscriber terminal, and transmits the call signal including the line information to the satellite earth station 7a to the subscriber interface unit. At 20a, the signal is converted into a signal specified by the subscriber interface and transmitted.

Upon receiving the calling signal including the line information, the exchange interface 36a of the satellite earth station 7a notifies the control unit 33a and sends the signal to the satellite line control station 6a via the satellite control line 12 to the satellite subscriber termination unit 2a and the satellite A line allocation request for the subscriber signal line 11 to the earth station 7a is notified.

Based on this request, the satellite control station 6a
When the subscriber's signal line 11 is set via the subscriber signal line 11, the subscriber's exchange 3a is connected via the subscriber's signal line 11 to the satellite subscriber terminal 2a.
Outgoing call signal including the line information.

The control unit 15a of the satellite subscriber termination unit 2a is connected to the subscriber signal line 1.
1. Based on the outgoing call signal received via the RF unit 14a, the layer 1 of the terminal termination circuit 17a is started up, and the outgoing call signal is transmitted to the incoming subscriber terminal 1. Subscriber terminal 1 whose line is incoming
When the subscriber terminal 1 responds, a response signal is transferred to the originating subscriber terminal 100 via each relay exchange and satellite circuit control station.

Thus, when the receiving subscriber is a satellite subscriber, the calling subscriber is directly sent to the terminating subscriber terminating unit without two hops on the communication line in the same manner as in the case of the satellite subscriber. It becomes possible to connect.

Also, if one subscriber line owns a plurality of communication lines, the call signal is individually received, and the satellite line control station 6a individually sets a path for the line number, It is possible to connect to different destinations corresponding to each telephone line.

 Next, a second embodiment of the present invention will be described.

FIG. 7 shows a second embodiment of the system configuration for realizing the present invention. 1 denote the same parts.
FIG. 8 shows an example of the configuration of a satellite subscriber termination unit for realizing the present embodiment, FIG. 9 shows an example of the configuration of a subscriber exchange for realizing the present embodiment, and FIG. 10 realizes the present embodiment. 11 is a configuration example of a satellite circuit control station for realizing the present embodiment, and FIG. 12 is a block configuration example of a satellite earth station for realizing the present embodiment.

 Hereinafter, this embodiment will be described with reference to the drawings.

In FIG. 7, reference numerals 1 and 100 are subscriber terminals, 2b is a satellite subscriber terminator for setting / releasing a satellite line and connecting / disconnecting a line between each earth station and the exchange at the request of the satellite line control station, and 3b is a satellite subscriber terminator. A function of interfacing with a satellite earth station and transmitting / receiving signals to / from a satellite circuit controller and each exchange via a common channel signal network,
A subscriber exchange having the function of requesting the satellite subscriber line control station to set up and release a satellite communication line through the satellite control subscriber line, and capable of accommodating subscribers, 4b is a signal between the relay exchange 5b A subscriber exchange having a transmission / reception function, 5b interfaces with a satellite earth station and transmits / receives signals to / from a satellite circuit control station and each exchange via a common line signaling network 13, and a satellite subscriber via a satellite control subscriber line. A relay exchange having a function of requesting a line control station to set up and release a satellite communication line, 6b is a signal transmission / reception function via a common line signal network with each exchange, and a satellite via a satellite control line with each exchange. A satellite line control station having a function of setting and canceling a telephone line, a function of managing information necessary for setting and canceling a satellite line, and a function of managing a state of use of a line between each earth station and an exchange; 7
b and 8b are for setting / cancellation of satellite line and connection / connection of line between each earth station and exchange and satellite line at the request of satellite line control station.
A satellite earth station to be disconnected, 9 is a communication satellite, 10 is a satellite communication line set between the satellite subscriber terminal 2b and the satellite earth stations 7b and 8b, 11 is a satellite subscriber terminal 2b and the satellite earth station 7b. The subscriber signal line 12 is set between the satellite signal control station 6b and the satellite subscriber terminating unit 2b and the satellite earth station 7b, 8b to transfer the control signal. A line 13 is a common line signal network for transferring call control signals such as address signals and response signals between the subscriber exchanges 3b and 4b, the transit exchange 5b and the satellite control station 6b.

In FIG. 8, reference numeral 14b denotes an RF unit which is a wireless transmission / reception device, 15b denotes a control unit for controlling each unit of the satellite subscriber terminal unit, 16b denotes a call path control unit for setting / cancelling a call path, and 17b denotes a subscriber terminal. This is the terminal termination circuit that terminates.

In FIG. 9, reference numeral 18b denotes a control unit for controlling each unit of the local exchange, 19 denotes an exchange switch for performing a switching operation of a telephone line in accordance with an instruction from the control unit, and 20b denotes a subscriber for transmitting / receiving a signal to / from a subscriber termination unit. An interface unit, 21b is a common signal processing unit for transmitting and receiving signals between the local exchange 3b and the satellite network controller 6b, an outgoing route translator 22b for translating the outgoing route and the outgoing exchange from the address information, and 23b for subscribing. Data.

24b in FIG. 10 is a control unit for controlling each unit of the transit exchange, 2
Reference numeral 5 denotes an exchange switch for switching the communication line according to an instruction from the control unit, 26b denotes a common line signal processing unit for transmitting and receiving signals between the exchange and the satellite line control station, and 27b denotes a departure route and departure from address information. An outgoing translator that translates the gate switch.

In FIG. 11, 28b is a control unit for controlling each unit of the satellite network control station, 29b is a satellite network control unit for controlling the earth station and satellite subscriber terminating unit via the satellite control channel, and 30b is transmission and reception of signals with the exchange. , A route translator 31b for translating the outgoing exchange and the outgoing route from the address information, and 32b a gate exchange file for storing the idle / busy information and attributes of each line of the exchange.

Reference numeral 33b in FIG. 12 denotes a control unit for controlling each unit of the satellite earth station, 3
Reference numeral 4b denotes an RF unit for performing transmission / reception of a wireless system, 35b denotes a call path control unit for controlling a call path in accordance with an instruction from the control unit, and 36b denotes a switch interface unit for transmitting and receiving signals between the subscriber and the relay switch.

The operation of this system will be described with reference to FIGS. First, when the subscriber terminal 1 accommodated in the satellite subscriber terminating unit 2b makes a call for communication from the subscriber terminal 1 to 100, the terminal terminating circuit 17b of the satellite subscriber terminating unit 2b transmits the user / network of the terminal device. It detects a layer 1 activation signal specified by the interface and notifies the control unit 15b. The control unit 15b notifies the satellite line control station 6b of a line allocation request for the subscriber signal line 11 via the RF unit 14b and the satellite control line 12 based on the detection result of the activation signal.

The satellite line control station 6b sets the subscriber signal line 11 between the subscriber terminating unit 2b and the satellite earth station 7b based on this request.
Here, the subscriber signal line can be set at all times, or LAP-
It is also possible to multiplex with D or the like.

A call signal including address information such as a telephone number from the subscriber terminal 1 is transmitted from the terminal termination circuit 17b of the satellite subscriber termination unit 2b to the R terminal.
The satellite earth station 7b passes through the F section 14b and passes through the subscriber's signal line 11.
The signal is received by the RF section 34b, converted into a signal specified by the subscriber line interface by the exchange interface section 36b, and transferred to the subscriber exchange 3b.

The subscriber interface unit 20b of the subscriber exchange 3b notifies the control unit 18b of the received call signal. The control unit 18b receives the outgoing route translator 22b from the outgoing call information and the outgoing subscriber information.
The common line signal processing unit 21b controls the calling signal including the calling / receiving address information and the calling side satellite line information via the common line signal network 13 by satellite line control. Via the satellite control line 12 from the satellite control line interface unit 101 to the satellite line control station 6b to set up a communication line between the satellite subscriber terminating unit 2b and the local exchange 3b. A request is made to set up a satellite communication line 10 between the satellite subscriber terminating unit 2b and the satellite earth station 7b. At this time, if the connection is within the own station, the calling signal is not sent to the satellite line control station 6b. Further, a satellite subscriber in the local station may request the satellite line control station 6b to set up the satellite communication line 10 between the satellite subscriber terminating units.

The satellite line control station 6b receives the satellite communication line setting request at the satellite earth station control unit 29b, and the control unit 28b transmits the satellite communication line 10 between the satellite subscriber termination unit 2b and the satellite earth station 7b based on the request. Set. Also, the common line signal processing unit 30b receives the call signal including the line information, searches the route translator 31b based on the calling / called address information in the signal, and the satellite line information on the calling side, and inputs the call. Request the subscriber termination unit, incoming switch, outgoing earth station, outgoing switch, gate switch file
Index 32b and hunt for free lines. Based on the determined incoming and outgoing earth station and the line number, the control unit 28b releases the satellite communication line 10 to the satellite earth station 7b via the satellite earth station control unit 29b and the satellite control line 12 and releases it to the satellite earth station 8b. It instructs the setting of the satellite communication line 10. On the other hand, the call signal including the address information and the hunted line information is sent to the common line signal processor 30.
b to the destination exchange 5b via the common line signaling network 13.

The control unit 15b of the subscriber terminating unit 2b controls the call path control unit 16b,
The control unit 33b of the satellite earth station 8b controls the communication path control unit 35b to connect the satellite communication line 10.

By processing as described above, the signal is transmitted from the subscriber termination unit 2b to the subscriber signal line 11, the satellite earth station 7b, the subscriber exchange 3b, the common line signal network 13, the satellite line control station 6b, and the common line signal. The communication line passes through the network 13 and the transit exchange 5b, but the communication line can be directly connected from the subscriber's satellite subscriber terminating unit 2b to the transit exchange 5b on the receiving side without two hops. .

The receiving-side intermediate exchange 5b receives the address information from the satellite line 6b and performs normal call processing. The line is connected to the receiving terminal, and when the receiving terminal responds, the response signal is transferred through the reverse route.

If the receiving subscriber is a satellite subscriber, the setting of the satellite communication line 10 is changed again so that the satellite communication line is directly set up from the calling satellite subscriber to the called satellite subscriber. Up to one hop, the communication line can be connected. By successively changing the connection in this way, there is an advantage that the voice and the tone signal are not interrupted even when a switch or voice inserts a tone signal in the middle of a telephone line or when a call is transferred.

Next, the communication from the subscriber terminal 100 to 1 is performed by the transit exchange 5b.
Searches the outbound route translator 27b based on the outgoing signal including the address signal from the local exchange 4b and hunts the satellite line, and hunts the outgoing signal via the common line signal network 13,
Transfer to satellite circuit control station 6b. The common line signal processing unit 30b of the satellite line control station 6b receives the call signal including the line information, indexes the route translator 31b and the gate switch file 32b based on the information, and enters the incoming satellite subscriber terminator, Search for incoming exchange, outgoing earth station, outgoing exchange, satellite earth station control section
From 29b, instruct the satellite earth station 8b and the satellite earth station 7b to set up the satellite communication line 10 via the satellite control line 12 and process outgoing signals including address information and hunted line information through common line signal processing. The data is transmitted from the unit 30b to the destination local exchange 3b via the common line signaling network 13. Local exchange 3b
Receives the outgoing call signal in the common line signal processing unit 21b, and
Translates the subscriber data 23b based on the address information.
From 1, a request to change the setting of the satellite communication line 10 is sent to the satellite line control station 6 b via the satellite control subscriber line 12. Upon receiving the setting change request, the satellite circuit control station 6b terminates the satellite subscriber termination unit.
The setting of the satellite communication line 10 is sent to 2b, and the release instruction is sent to the satellite earth station 7b. As described above, similarly to the first embodiment, when the receiving subscriber is a satellite subscriber, the communication line is transmitted to the called subscriber terminating unit in the same manner as in the case where the transmitting subscriber is a satellite subscriber. Can be directly connected without making two hops.

Also, when one subscriber line owns a plurality of communication lines, the call signals are individually received, and the satellite line control station 6b individually sets a path for the line number, It is possible to connect to different destinations corresponding to each telephone line.

As described above, in the first embodiment of the present invention, the local exchange does not have a function of controlling the satellite line, but transfers all calls originated from the satellite subscriber to the satellite line control station, It is characterized in that the station directly sets up a communication line between terminals, and can be realized, for example, by applying an existing subscriber exchange.

In the second embodiment, the local exchange has the function of controlling the satellite line by providing the satellite control line interface unit, and the local exchange can call the satellite line control station if the connection is within its own station. When a line is relayed without transmitting a signal, the setting is sequentially changed along a relay exchange. Therefore, in the second embodiment, when the receiving side is in the local station, no call is made to the satellite line control station, so that the network can be used efficiently.

In addition, an intermediate switch can insert a voice or tone signal into a telephone line, and the voice or tone signal is not interrupted when a call is transferred.

〔The invention's effect〕

As described above, in the schemes of the first and second aspects of the present invention, since the subscribers with satellites can connect to the relay system in one hop, the propagation delay is reduced by half compared to the conventional two-hop scheme. This has the advantage that the call can be made without deteriorating the call quality. In addition, since it is possible to directly connect to the relay system, there is no need to capture a terrestrial communication line therebetween, so that the in-network equipment can be provided for other calls, so that the in-network equipment can be effectively used.

[Brief description of the drawings]

FIG. 1 is a first embodiment of a system configuration for realizing the present invention, FIG. 2 is a configuration example of a satellite subscriber terminating unit for realizing the first embodiment, and FIG. FIG. 4 shows a configuration example of a subscriber exchange for realizing the embodiment, FIG. 4 shows a configuration example of a transit exchange for realizing the first embodiment, and FIG. 5 shows a satellite line for realizing the first embodiment. FIG. 6 is a block diagram of a satellite earth station for realizing the first embodiment, FIG. 6 is a second embodiment of a system configuration for realizing the present invention, FIG. Fig. 9 shows an example of the configuration of a satellite subscriber termination unit for realizing the second embodiment. Fig. 9 shows an example of the configuration of a subscriber exchange for realizing the second embodiment. Fig. 10 shows the second embodiment. FIG. 11 is a configuration example of a transit exchange for realizing the example, FIG. 11 is a configuration example of a satellite circuit control station for realizing the second embodiment, FIG. Block configuration example of the satellite earth station for implementing the second embodiment, FIG. 13 is an example of a switching network to which the conventional satellite demand assignment communications. 1,49,50,100 …… Subscriber terminal, 2a, 2b, 37 …… Satellite subscriber termination unit, 3a, 3b, 4a, 4b, 38,39 …… Subscriber exchange, 5a, 5b, 40 …… Transit exchange , 6a, 6b, 41 …… Satellite control station, 7a, 7b, 8a, 8b, 42,43 …… Satellite earth station, 9,44 …… Communication satellite, 10,45 …… Satellite communication line, 11,46 …… Subscriber signal line, 12,47 …… Satellite control line, 13,48 …… Common line signal network, 14a, 14b, 34a, 34b …… RF section, 15a, 15b, 18a, 18b, 24a, 24b, 28a, 28b, 33a, 33b ... control unit, 16a, 16b, 35a, 35b ... call path control unit, 17a, 17b ... terminal termination circuit, 19, 25 ... exchange switch, 20a, 20b ... subscriber Interface section, 21a, 21b, 26a, 26b, 30a, 30b ... common line signal processing section, 22a, 22b, 27a, 27b ... outgoing path translator, 23a, 23b ... subscriber data, 29a, 29b ... Satellite earth station controller, 31a, 31b: Route translator, 32a, 32b: Gate switch file, 36a, 36b: Switch interface unit, 101: Satellite Control line interface,

Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI H04Q 7/30 (72) Inventor Hiroyuki Tsuchiya 1-6, Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (56) References JP JP-A-63-27156 (JP, A) JP-A-63-33956 (JP, A)

Claims (4)

(57) [Claims] (1) a satellite communication line with a satellite subscriber termination unit;
A satellite earth station for setting a subscriber signal line, a signal line for satellite demand assignment control including a satellite line control station that interfaces with the satellite earth station and has a signal transmission / reception function with each exchange, an I interface, and a communication line, and a communication line. Are logically separated from each other in a satellite circuit switching network having satellite subscriber terminals accommodating satellite demand assigns, wherein the satellite earth station is connected to the subscribers accommodating the satellite demand assigns in accordance with a destination to be received. A satellite line switching control system, which is directly connected to a relay communication line or a receiving subscriber line via a telephone line. 2. The communication system according to claim 1, wherein when one subscriber line accommodated in said satellite subscriber terminal has a plurality of telephone lines, it is connected to a different ground corresponding to each telephone line.
The described satellite circuit switching control method. 3. A satellite communication line between the terminal and a satellite subscriber terminal.
A satellite earth station for setting a subscriber signal line, a signal line for satellite demand assignment control including a satellite line control station that interfaces with the satellite earth station and has a signal transmission / reception function with each exchange, an I interface, and a communication line, and a communication line. In a satellite circuit switching network provided with satellite subscriber terminals accommodating satellite demand assigns that are logically separated, each of the exchanges has a function of requesting the satellite circuit control station to set up and release a satellite communication line, The call line of the subscriber accommodating the satellite demand assign is sequentially extended and set along the relay exchange, and is directly connected to the relay call line or the incoming subscriber line via the satellite earth station according to the destination to receive the call. A satellite circuit switching control method characterized by connection. 4. When one subscriber line accommodated in said satellite subscriber terminal has a plurality of telephone lines, it is connected to a different ground corresponding to each telephone line.
The described satellite circuit switching control method.