JPH06244961A - Line re-connection method - Google Patents

Abstract

PURPOSE:To attain economy for a communication network by sending re-routing information through a line interrupt signal line. CONSTITUTION:A line control circuit 18 of a subscriber exchange 6 sets re-routing information to a line interrupt signal to send the resulting signal to a relay exchange 5 to serve an absence guide service and to release a communication line 11 and a radio channel 20. A line control circuit 17 of the exchange 5 makes state discrimination based on a predetermined algorithm based on the re-routing information. That is, when there is any line connecting to a voice storage device 8 by its own exchange, the exchange makes line setting to a communication processing node immediately. When no line is available, it is discriminated that its own exchange is a switch back start station. Thus, when a communication line is set to a called communication terminal equipment and the communication line is set again to the communication processing node depending on the state of the terminal equipment, the setting of the communication line between a caller side subscriber exchange (or receiver side gate exchange) and the communication processing node is optimized. Thus, useless holding of the communication line is eliminated and the communication network is economized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection from an originating communication terminal to a terminating communication terminal. Depending on the state of the terminating communication terminal, the communication line is connected to a communication processing node, for example, a voice accumulating device for absence guidance service, due to absence. The present invention relates to a line reconnection method for resetting a line.

[0002]

2. Description of the Related Art A conventional line reconnection method will be described with reference to FIG. 3 using a voice storage device as a communication processing node and taking a second-order mobile communication network as an example. The absence guidance service using a voice storage device enables the caller's message to be recorded by connecting the caller's mobile communication terminal to the voice storage device when the caller's mobile communication terminal calls the caller's mobile communication terminal but does not respond. It is something to do.

When a call request from the mobile communication terminal 1 to the mobile communication terminal 2 is made to the subscriber exchange 3, the line control circuit 15 of the subscriber exchange 3 causes the line exchange circuit 15 of the mobile communication terminal 2 (the mobile exchange of the mobile communication terminal). A communication line 9 to the upper relay exchange 4 is set up toward the subscriber exchange 6 which is a subscriber exchange corresponding to the area in which the location is registered. The line control circuit 16 of the repeater exchange 4 sets the communication line 10 to the repeater exchange 5 which is located above the subscriber exchange 6. The line control circuit 17 of the repeater exchange 5 sets the communication line 11 to the subscriber exchange 6 located below. At this point, the mobile communication terminal 1
The communication lines 9, 10, and 11 are set between the mobile communication terminal 2 and the mobile communication terminal 2, and the mobile communication terminal 2 can be called.

When the mobile communication terminal 2 subscribes to the voice storage service and there is no response, the line control circuit 18 of the subscriber exchange 6 sets the voice storage with the own exchange as a starting point in order to provide the absence guidance service. The communication line 12 to the upper repeater exchange 5 is set toward the device 8. The line control circuit 17 of the repeater exchange 5 sets the communication line 13 to the repeater exchange 7 having an interface with the voice storage device 8. The line control circuit 19 of the repeater exchange 7 sets the communication line 14 to the voice storage device 8. In this way, communication lines 9, 10, 11, 12, 13 are provided between the mobile communication terminal 1 and the voice storage device 8.
14 is set, and a message from the sender of the mobile communication terminal 1 can be recorded in the voice storage device 8.

[0005]

In this case, however, in the message recording state, the communication between the mobile communication terminal 1 and the voice storage device 8 and the relay exchange 5 can directly connect the communication lines 10 and 13. But communication lines 11, 1
2 and the subscriber exchange 6 are bypassed, and the communication line between the repeater exchange 4 and the repeater exchange 7 is always efficiently set like the communication lines 10 and 13 depending on the position between these exchanges. There was a drawback that it was not always. This is because the second line setting is performed with the end point of the first set line (the subscriber exchange 6 in FIG. 3) as the restart point.

Although a call is received from the other communication network to the mobile communication terminal in the mobile communication network, the same drawback occurs when the line is reset in the voice storage device in the mobile communication network in the absence. ing. An object of the present invention is to set a communication line to an incoming communication terminal and, when the communication line is further set to a communication processing node depending on the state of the terminal, set the communication line to be set between the originating side subscriber exchange and the communication processing node. An object of the present invention is to provide a line reconnection method that makes it possible to optimize the line.

[0007]

According to the present invention, when it is necessary for the receiving side subscriber exchange to reset the communication line to the communication processing node, a communication line reset is made on the signal exchanged with the relay exchange. Information related to the setting (hereinafter referred to as rerouting information) is set, and the transit exchange that has received the signal determines whether or not it is in the route of the communication line that the own exchange reconfigures based on the rerouting information of the signal. It is determined (hereinafter referred to as “restart point determination processing”), and when it is not on the route, relays the rerouting information to the preceding relay exchange and releases the existing communication line with the preceding exchange. If it is on the route, the communication line is reset with its own exchange as the starting point.

In the conventional system, the "rerouting information" is not present on the signal between the exchanges, and the "restart point determination process" is not in the line control circuit in the exchange. The starting point is that there is an unnecessary line between the terminating subscriber exchange and its upper transit exchange, and in some cases the communication line between the terminating subscriber exchange and the communication processing node is not optimal. However, the present invention overcomes such drawbacks.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described by using a voice storage device as a communication processing node and taking a second-order mobile communication network as an example, as in the description of the conventional system shown in FIG. In response to a call request from the mobile communication terminal 1 to the mobile communication terminal 2, the line control circuit 15 of the subscriber exchange 3 heads for the subscriber exchange 6 which is the in-area exchange of the mobile communication terminal 2 and the upper relay exchange 4
Set the communication line 9 to. The line control circuit 16 of the repeater exchange 4 sets the communication line 10 to the repeater exchange 5 which is located above the subscriber exchange 6. The line control circuit 17 of the repeater exchange 5 sets the communication line 11 to the subscriber exchange 6 located below. At this point, the communication lines 9, 10, 11 are set between the mobile communication terminal 1 and the mobile communication terminal 2, and the mobile communication terminal 2 can be called.

When the mobile communication terminal 2 subscribes to the voice storage service and does not respond, the line control circuit 18 of the subscriber exchange 6 provides "rerouting information" (on the line disconnection signal) to provide the absence guidance service. (Point information of the voice storage device 8, rerouting type, various service types, etc.)
Is set and sent to the repeater exchange 5, and the communication line 11 and the wireless line 20 are released. Line control circuit 1 of transit switch 5
7 determines the state by the algorithm shown in FIG. 2 based on the "rerouting information". That is, first, the own exchange judges whether there is a line with the communication processing node (the voice storage device 8 in this example) (decision 5), and if there is such a line, immediately sets the line for that communication processing node (state 4). If there is no line with the communication processing node, it is judged whether or not the own exchange is the switchback origin station (whether it is on the path of the communication line to be reset) (judgment 6). A line is set for the transit switch to efficiently connect the switch to the communication processing node (state 3). If it is judged in the decision 6 that the own exchange is not the switchback origination station, it is advantageous to set the own exchange as the restarting point in order to connect the originating subscriber exchange 3 to the communication processing node, that is, the communication line to be reset. If it is judged to be advantageous, it moves to state 3, if it is judged not to be advantageous, it moves to state 2 and relays the rerouting information to the preceding relay exchange. .

If the line control circuit 17 of the repeater exchange 5 is not the switchback origination station and it is not advantageous to use the own exchange as the restarting point in this example, the state 2 is determined and "rerouting information" is displayed on the line disconnection signal. Is set and relayed to the preceding relay exchange 4, and the communication line 10 is released. Based on the "rerouting information", the line control circuit 15 of the repeater exchange 4 judges the state 3 because the own exchange is the switchback origination station according to the algorithm shown in FIG. The communication line 21 to the repeater exchange 7 having an interface with the device 8 is set (in this example, the case where it is more advantageous to select the repeater exchange 7 for the setting of the communication line with the voice storage device 8 is shown. ). Relay switch 7
The line control circuit 19 of the communication line 14 to the voice storage device 8
To set. Thus, the mobile communication terminal 1 and the voice storage device 8
The communication lines 9, 21 and 14 are set up between and so that the message from the caller can be recorded in the voice storage device 8.

As shown in the above example, the communication lines 11 and 12 in FIG. 3 are not necessary for the communication line reset by putting the "rerouting information" on the line disconnection signal, and By incorporating the algorithm shown in FIG. 2 in the line control circuit of the exchange, it is possible to optimize the setting of the communication line between the originating subscriber exchange and the communication processing node.

In the above description, the present invention is applied to the mobile communication network of the second floor, but a communication network of the third floor or higher may be used, and a gateway switch for controlling communication with other communication networks is also a relay switch in the present invention. In addition, the communication processing node may be configured so that not only the relay exchange but also one subscriber exchange or a gateway exchange and a communication line are set up. Also, when the mobile communication terminal receives an incoming call from another communication network and the communication line needs to be reset, the same processing as described above is performed.
However, in this case, when the rerouting information reaches the gateway exchange, the gateway exchange operates as a switchback origin station.
The present invention is not limited to the absence guidance service, but for example, if the subscriber is receiving a call forwarding service and is making call forwarding to the subscriber exchange, if the subscriber terminal receives a call, the called subscriber will receive the call. The exchange resets the communication line to the transfer destination terminal, but this resetting can be performed in the same manner as described above. The present invention can be applied not only to mobile communication networks but also to fixed communication networks.

[0014]

As described above, by using the present invention, when the communication line is set in the incoming communication terminal and the communication line is further set in the communication processing node according to the state of the terminal, the calling side joins. It is possible to optimize the setting of the communication line between the private branch exchange (or the receiving-side gateway exchange) and the communication processing node. As a result, it is possible to eliminate wasteful holding of communication lines and to make the communication network economical.

[Brief description of drawings]

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

FIG. 2 is a flowchart showing an example of a processing algorithm added to the line control circuit of the transit exchange in the present invention.

FIG. 3 is a block diagram showing a communication network and a setting line for explaining a conventional line reconnection method.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koji Yamanaka 2-10-1 Toranomon, Minato-ku, Tokyo NTT Mobile Communication Network Co., Ltd.

Claims (1)

[Claims] 1. A service for subscribers, comprising a subscriber exchange for controlling communication with a communication terminal, a relay exchange for controlling communication between the subscriber exchanges, and a communication line between one exchange and the exchange. In a communication network consisting of a communication processing node that executes processing, a line for setting a communication line from a calling terminal to a receiving terminal once, and then resetting the communication line to the above communication processing node depending on the state of the receiving terminal. In the reconnection method, when the above-mentioned reset occurs, the receiving side subscriber exchange sets the information relating to the communication line resetting on the signal exchanged with the relay exchange, and the relay exchange receiving the signal sets the signal. Based on the information above, it is determined whether or not the own exchange is on the route of the communication line to be reset, and if the determination is not on the route, the above information is further sent to the preceding relay exchange. Continuing to release the existing communication line with the preceding exchange, and if the above judgment is on the route, reconfigure the communication line with the own exchange as the restarting point. Method.