JPS59103456A - Line selecting control system - Google Patents

Abstract

PURPOSE:To improve the utilizing efficiency of a line by selecting again a processor having other relay function when a line between a processor having the selected relay function at first and an exchange of incoming side is busy. CONSTITUTION:When a call comes from a packet network, a gate way station at the packet network selects a packet multiplexer (q). A gate way station 5 at telephone network selects a channel between the packet multiplexer (q) and the gate way station of the telephone network by subscriber information of a telephone network terminal of the incoming side. If this line is busy, the idle information of a channel group to another packet multiplexer is informed to the gate way station 4 of packet network via the packet multiplexer (q) together with the busy signal. The station 4 selects again the packet multiplexer based on the idle information of the informed channel and makes a call again.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a line selection control system in a switching network in which a plurality of processing devices having a relay function are interposed in parallel between two switching equipment.

Prior Art and Problems To explain this type of switching network using the example of a general telephone switching network, as shown in FIG. is configured to do so.

In the conventional system, when a call occurs at the originating exchange 1 to the destination exchange 2, the originating exchange 1 communicates with the relay exchanges 3 to 3.
A relay exchange p having an empty communication line is selected randomly or sequentially from among g&, and a call is made. If the line from transit exchange p to destination exchange 2 is busy, transit exchange p sends a busy signal to the origination exchange,
The call is considered a lost call.

This conventional system has the disadvantage that the lines cannot be used efficiently because other routes from the originating exchange to the destination exchange are not used even if there is a gap.

OBJECTS OF THE INVENTION The present invention has been made in view of the problems of the conventional systems described above, and its purpose is to provide a line selection control system that enables efficient use of lines in this type of switching network.

Structure of the Invention The present invention achieves the above-mentioned objects, when the line between the first selected processing device having the relay function and the destination exchange is busy, the line between the destination exchange and another processing device is The system is configured so that the availability information is notified to the originating exchange, and the originating exchange reselects another processing device having a relay function based on the availability information.

Embodiments of the Invention The first embodiment is a case where the present invention is applied to a general telephone switching network.
This will be explained according to the diagram.

When a call to the destination exchange 2 occurs in the originating exchange 1, the originating exchange 1 first selects an empty intermediate exchange p from 3% to 3% of the intermediate exchanges in the same manner as in the conventional method. In other words, the empty state of the outgoing route to the relay exchange is searched randomly, sequentially or in order of the highest heat storage capacity of the empty state based on the network management information, and the empty relay exchange selected in this way is searched for. An address signal is sent to p. Upon receiving this, the transit exchange p checks the availability of the communication line heading to the destination exchange 2, selects an empty line if there is one, and notifies the destination exchange 2 of this line number via the inter-office signal line. do. As a result, a communication path is established between the originating exchange 1 and the destination exchange 2.

If there are no available communication lines from the transit exchange p to the destination exchange 2, the transit exchange p inquires of the destination exchange 2 about the availability of communication lines between the destination exchange 2 and other transit exchanges 3 to n. Receiving this inquiry, destination exchange 2 checks whether the communication lines between trunk exchanges 3 to % are empty, and if there is an empty communication line, it sends only one number of the other relay exchange in question to the relay exchange. Notify p. Upon receiving this, the relay exchange p notifies the received number of the other relay exchange together with a busy signal to the originating exchange 1 through the inter-office signal line or the speech line. Upon receiving this, the originating exchange 1 reselects the other relay exchange based on the received number of the other relay exchange and retransmits the address signal. Thereafter, a communication path between the originating exchange 1 and the destination exchange 2 is established according to the same procedure as in the conventional system.

In the above case, if there is no empty call line between the destination exchange 2 and all the transit exchanges 3~%, the destination exchange 2 notifies the transit exchange p of this fact, and this is sent to the origination exchange along with a busy signal. 1, and the originating exchange that receives this notification marks the call as a lost call.

Note that the busy state can be determined by notification of the numbers of other relay exchanges, so the busy signal may be omitted.

Next, another example of connection between telephone and packet networks will be explained in the second section.
This will be explained according to the diagram. 4 is a gateway switching center on the packet network side, 5 is a gateway switching center on the telephone network side, 6 is a gate 984 station on the packet network side and the gateway station 50 on the telephone network side.
This is a packet multiplexing device interposed between the two. Here, the line between the packet multiplexer 6 and the telephone network side gateway station 5 is connected to a telephone line 7 that is managed by dividing into a plurality of line groups according to the transmission speed and transmission control procedure of the telephone network side terminal. It is composed of a signal line 8 for transmitting and receiving control signals. Further, the packet network side gate 984 station 4 and the packet multiplexer 60 are connected to each other by the bucket network inter-station signal line 9 of s4aK&/S. The transmission speed and transmission control procedure of the telephone network terminal necessary for selecting the telephone line 7 are included in the subscriber information of the gateway station 5 on the telephone network side.

Now, when there is a call from the packet network side, the packet network side gate 984 station 4 selects the packet multiplexer q randomly or sequentially and sends the call. Since the packet multiplexer q does not know which line group to select among the communication lines 7 going to the telephone network side gateway station 5, it uses the signal line 8 to connect the telephone network side gateway station 5 to the telephone network side gateway station 5.
Please contact us. The telephone network gateway station 5 selects a communication line between the packet multiplexer q and the telephone network gateway station based on the subscriber information of the telephone network terminal on the receiving side. Therefore, in the case of a busy situation, similar to the example of the general telephone network,
Information on availability of the communication line group with other packet multiplexers is notified to the packet network side gate 984 station 4 via the packet multiplexer q along with a busy signal. The packet network side gate 984 reselects the packet multiplexer based on the notified call line availability information and retransmits the call.

In the first embodiment described above, the terminating exchange notifies the originating exchange of the number of only one other relay exchange that has a vacant line between it, but if there are multiple such relay exchanges, If such numbers exist, a configuration may be adopted in which these numbers are notified to multiple originating exchanges. This reduces the possibility that the above-mentioned detour will not be completed due to the busy state of the communication path between the originating exchange and the transit exchange. The same applies to the second embodiment.

Furthermore, in the first embodiment described above, the destination exchange only notifies the originating exchange of the number of another transit exchange that has a vacant line, but in addition to this, the destination exchange If the configuration is such that a free line is secured in advance between the caller and the caller, there is no risk that the notified free line will become busy due to other calls during the above-mentioned detour, and a complete detour can be achieved. . The same applies to the second embodiment.

As described in the detailed description of the invention, when the line between the first selected processing device having a relay function and the destination exchange is busy, the originating exchange transmits the line availability information between the destination exchange and another relay processing device. This method allows the originating exchange to reselect another relay processing device based on the availability information, so the route from the originating exchange to the destination exchange can be optimally selected, and the line It has the advantage of being able to be used efficiently.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a general telephone network to which one embodiment of the present invention is applied, and FIG. 2 shows the configuration of a telephone/packet network connection network to which another embodiment of the present invention is applied. A block diagram. 1... Originating exchange, 2... Destination exchange, 3... Field...
・Relay switch, 4...Packet network side gateway station,
5...Telephone network side gateway station, 6...Information...Packet multiplexing device, 7...Telephone line, 8...Interoffice signal line, 9...Packet network interoffice signal line.

Claims (1)

[Claims] In a switching network in which a plurality of processing devices having a relay function are interposed in parallel between two exchanges, when there is no empty call line between the first selected processing device having a relay function and the destination exchange. , the destination exchange notifies the originating exchange of the number of another processing device with a relay function that has an empty call line between it and the destination exchange through the first selected processing device with a relay function. A line selection control method characterized in that the originating exchange reselects another processing device having a relay function corresponding to the notified number.