JPS6020673A - Reserved connection and change-over connection system - Google Patents

Abstract

PURPOSE:To increase efficiency of use of circuits by changing connection of a relay route during communication maintaining connection of sending and receiving terminals. CONSTITUTION:Terminals 23-28 are connected respectively to switchboards 2--22. Reservation information is transferred from a terminal 19 for reservation to the reservation controlling section 14 of a reservation center 13. The reservation controlling section 14 is controlled by a route file 16 and shortest reservable relay route is secured for each divided unit time. At this time, the state of vacancy of circuit is checked by a circuit reservation file 17, and connection information is written in a connection information file 18. On the other hand, the reservation controlling section 14 is started periodically by a timer 40. The reservation controlling section 14 scans a connection information file 19, and compares time of starting of communication with the timer display. If they coincide, connection information of the connection information file is read out, and assembled to a connection signal, and transferred from a signalling device 15 to a switchboard connected to the sending terminal through a signal circuit 32. Connection is made doubly, old and new, at the time of switching, and then changed to a new route.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a reserved connection switching connection method in which a relay route between a calling terminal and a receiving terminal is switched during communication. Once a relay route is determined at the start of communication, the same route is used until the end of communication.

FIG. 1 shows a network model of a conventional reserved connection method. 1, 2.3 are exchanges, 4, 5, 6, 7, 8, 9 are terminals, and 10, 11, and 12 are lines.

Also, the number of lines for each line is 1.

Set the time to connect to the reservation service as t□<t, <t3<t4
In this case, when a request is made to reserve terminals 4 and 6 from time t1 to time t, line 10 is reserved from time t□ to t3. Next, if a request is made to reserve terminals 5 and 7 from time t2 to t4, lines 11 and 12 will be reserved from time t2 to t4.
is reserved. . (For example, patent application No. 55-106394
No. (Japanese Unexamined Patent Publication No. 57-31254), Special Publication No. 58-2
0500 Publication) Prior Art and Problems In the conventional reservation connection method shown in FIG. If the route could be routed to line 10 instead of lines 11 and 12, reserved communication between terminals 9 and 8 would be possible, but the conventional system had the drawback that communication was not possible.

In other words, in the conventional reserved connection system, the same relay route is used at the start of communication (in two dimensions, until the end of communication), so it is difficult to use the relay route efficiently.

Purpose of the Invention In order to eliminate this drawback, the present invention improves the efficiency of line usage by changing the connection of the relay route while maintaining the connection between the originating and terminating terminals during communication. will be explained in detail.

Embodiment of the Invention FIG. 2 shows a network model of the reservation connection switching system of the invention, in which reference numeral 13 denotes a reservation center, which is basically a computer. Reference numeral 14 denotes a reservation control unit of a computer having functions of transmitting and receiving information with the reservation terminal and transferring connection information, and 40 has a function of interrupting the reservation control unit 14 with a timer.

15 is a signaling device, 16 is a route file, 17 is a line reservation status file, 18 is a reservation connection information file, 19 is a reservation terminal, 20, 21, and 22 are exchanges, 26゜2
4, 25, 26, 27, 28 are terminals, 29,
30 and 31 are lines, and the number of lines in each line is 1.

32 is a signal line between the exchange and the reservation center, and 40 is a timer.

Next, the operation will be explained. Now, the unit time managed by the reservation center 13 is tl tl2 tl3 + '4.
Let tl<t, <t, <t.

First, reservation information having a communication start time t□9 a communication end time t3y, a transmitting terminal 231, and a receiving terminal 25 is transferred from the reservation terminal 19 to the reservation control unit 14 of the reservation center 16. The reservation control unit 14 divides the route into units of time managed by the route file 16, and secures the shortest relay route that can be reserved for each unit time. The sending terminal 26 and receiving terminal 25 of the reservation information
The route file 16 is searched from , and routes are determined in order of shortest relay route.The first relay route is the line 29, and the second relay route is the lines 30 and 31. Next, the reservation control section 14
divides time t1 to t3 into unit times t1 to t2 and t2 to t managed by the line reservation status file 17, and divides the line reservation status file 17 into the first unit of time t1 to t2 managed by the line reservation status file 17.
The status of the line 29, which is the relay route, is checked, and if it is empty, the number of empty lines is subtracted by 1, and if it is not empty, the line on the second relay route is checked in the same way. From current time t to t2
Since the number of free lines for line 29 is 1, it is rewritten to 0. Next, in the same way, the line reservation status file 17 is changed from time t2 to t.
The idle status of line 29, which is the first relay route, is checked, and since the number of idle lines is 1, it is rewritten to O. Next, the reservation control unit 14 notifies the reservation terminal 19 (2) that the application for the reservation information is on a reservation basis, and also sends the terminals 26 and 25 to the line 29 from time t1 to 1s in the connection information file 18. Write the information to connect using .

Next, the communication start time t22 and the communication end time t4 p have the sending terminal 241 and the receiving terminal 26 ° The reservation information is sent to the reservation terminal 1
9 to the reservation center 13 to apply for a reservation.

The reservation center 13 performs processing according to the same procedure as above, from communication start time t2 to communication end time 1. is divided into management unit time from time t2 to t3 and from t3 to t4, and from time t2 to 4.
．． selects lines ao and si as relay routes, and selects line 29 from time t to t4.

The relay route and the originating terminal 242 and the receiving terminal 26 at each time are stored in the connection information file 18.

Next, in the same way as above, communication start time 'Rs communication end time t4
The reservation information having two calling terminals 281 and 27 receiving terminals is sent to the reservation center 16, and the reservation center 16 sends the reservation information from time t to t.
4 selects line 61 as the relay route. The connection information including the relay route, the calling terminal 2, and the receiving terminal 27 at this time is stored in the connection information file 18.

FIG. 3 shows changes in the status of the reservation status file at time tl+'t+t3+t4 for the lines 29, 30, and 31 for each of the above reservations.

I indicates the state before accepting reservations, ■ indicates after accepting reservations for communications between terminals 23 and 25, ■ indicates after accepting reservations for communications between terminals 24 and 26, ■ indicates after accepting reservations for communications between terminals 28 and 27, and 1 y
tr Indicates the number of idle lines. Further, A is used for communication between terminals 23 and 25, and B is used for communication between terminals 24 and 26.

C indicates each state used for communication between the terminals 28 and 27.

Since the line reservation status is known in this way, it is possible to easily select the optimal relay route.

On the other hand, the reservation control unit 14 is activated periodically based on the display of the timer 40, and the reservation control unit 14 is activated by the connection information file 19.
, compares the communication start time with the timer display, and if they match, reads out the connection information from the connection information file 19, combines it into a connection signal, and sends the signal line 62 from the signal device 15.
to the calling terminal's connected exchange. Fourth
The figure shows the format of the connection signal. 55 is an exchange number for identifying which exchange the connection information is transferred to; 34 is a calling terminal; 35 is a receiving terminal; 66 is a communication start time; 67 is a communication end time or relay route switching time; 68 is a relay route, and R in 57 and 38 is repeated every time switching is performed. 69 is a signal end code indicating the end of the connection information signal. For example, as the content of the signal transfer format to be transferred to the exchange at communication start time t2, the exchange number 66 is set to exchanges 20, 21, 22, and the originating terminal 6.
4, the terminal 241, the receiving terminal 35, the terminal 262, and the communication start time 66, t2. First communication end time or relay route switching time 67) Second is tBy relay route 68 includes lines 30 and 31, next communication end time or relay route switching time 67 includes '4 + line 29 in relay route 38 .

Based on the connection signal, the exchange to which the originating terminal is connected uses a timer within the exchange to establish a connection by extending the path according to the route of the connection signal at the communication start time.

Also, at the switching time, the originating exchange connects the new route to the exchange connected to the receiving terminal according to the route from the switching time of the connection signal mentioned above, and connects the new route with the old one that has been used until now. Connect the routes to make a double connection. When the double connection is completed, the receiving side exchange notifies the originating side exchange, and based on this notification, the originating side exchange switches the call path to the newly connected route, releasing the old route that was used until now. The exchange on the called side releases only the old route.

When the communication end time is reached, the currently connected routes are sequentially released from the originating exchange.

The reservation center 16 similarly reads the connection information at the communication start time t2 using the timer 4o, and sends the connection information to the exchanges 20, 21, 22.
Based on the connection information, the exchanges 20, 21 and 22 connect the terminals 24 and 26 to the lines 30 and 3i from time t2 to t, and at time 63, the exchanges 20 and 22 connect the terminals 24 and 26 to the lines 30 and 3i based on the connection information.

21 switches the relay route to line 29 without disconnecting the terminal, and disconnects it at time t4.

The reservation center 13 similarly reads the connection information at the communication start time t3 using the timer 4o and transfers the connection information to the exchange, and the exchanges 21 and 22 use the connection information to connect the terminals 27 and 28 between times t3 and t4. and the line 61 is connected.

In this way, the relay route is determined by searching the reservation center's line reservation status file and checking the line's blockage status, and since the switch can switch the relay route without disconnecting the terminal, it is possible to determine the relay route at each time. The optimal relay route can be selected, and the network can be operated efficiently.

As described in detail of the invention, the number of lines in use can be ascertained and reserved in advance, and lines can be switched and relay routes can be changed without disconnecting terminals, thereby making effective use of lines.

This has the advantage of improving network throughput.

[Brief explanation of drawings]

Fig. 1 is a network model of the conventional reserved connection method, Fig. 2 is a network model of the reserved connection switching connection method of the present invention, Fig. 6 is a diagram showing changes in the state of the line reservation status file for each reservation, and Fig. 4 is an example of a signal transfer format of connection information. 1.2.3... Switchboard, 4, 5, 6, 7, 8.9...
・Terminal, 10, 11, 12...Line, 16...
Reservation center, 14... Reservation control unit, 15... Signal device, 16 River route file, 17... Line reservation status file, 1st... Reservation connection status file, 19...
Reservation terminal, 20, 21, 22... exchange, 23,
24, 25, 26, 27, 28...terminal, 2
9, 50, 51... line, 32... signal line,
33...Exchange number, 54...Calling terminal, 35...
- Receiving terminal, 66... Communication start time, 67... Communication end time or relay route switching time, 58... Relay route, 39... Signal end code, 40... Timer patent applicant Nippon Telegraph Telephone Public Corporation agent Patent attorney Gobe Tamamushi (1 other person) Figure 1 Figure 4 Figure 2 -362- Figure 3

Claims (1)

[Claims] In a switching network that performs reservation connections, which has a relay route between the exchanges that connect the originating terminal and the terminating terminal, and accommodates a reservation center that receives reservation applications for reserved connections from reservation terminals, the reservation center is connected to the originating terminal. a route file that searches for a relay route from the terminating terminal, a line reservation status file that records and searches the reservation status of each line including the relay route in the exchange network at each time, and The reservation center is equipped with a reservation connection information file that stores reservation connection information between relay routes at different times, and the reservation center has communication start time 9 communication end time 1 originating terminal 9 each of the receiving terminals input from the reservation terminal to the reservation center. Based on the reservation information consisting of information, select and decide the shortest route for each time from the route file and line reservation status file, and make a reservation from the reserved connection information file a certain period of time before the communication start time of the reserved connection. The connection information is transferred from the reservation center to the exchange, and the exchange switches the connection between the originating terminal and the terminating terminal according to the relay route selected and determined for each time based on the reservation connection information received from the reservation center. A reserved connection switching connection method characterized by setting.