JPH06232835A - Automatic time slot allocating method - Google Patents

Abstract

PURPOSE:To prevent instaneous interruption from being generated to a line other than a change object even when a communication channel is changed/ added by reallocating a time slot only concerning the communication channel for which physical connection is changed. CONSTITUTION:When there is a change of deleting a device C and adding a device E later, the time slot TS2 of the communication channel set to the physical connection between devices A and C is turned to the unused time slot. Afterwards, the communication channel set to the physical connection between the added devices A and E is allocated to the TS2 but the time slot already allocated to the communication channels between the devices A and B and between the devices A and D is not changed. When the device C is restored, the instaneous interruption of the communication channel between the devices A and C concerning the device C can be prevented by reallocating the line to the time slot allocated to the communication line between the devices A and C before the device C is deleted since the physical connection of the line is not changed before and after the deletion/recovery.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is not subject to change in a communication system such as a multiplex transmission device which performs communication by multiplexing with time slots even if the configuration information (particularly the definition regarding the line) is changed. Time slot automatic allocation method for automatically allocating time slots without affecting the operation of the line.

[0002] In recent years, communication systems have tended to be frequently changed and added due to their complexity. In such a change or addition, it is necessary to easily change or add the communication line without affecting the communication line currently in operation as much as possible.

[0003]

2. Description of the Related Art In the prior art, when a large amount of communication lines are set up and some settings are changed or lines are added / deleted, all time slots of the entire system are reassigned from the beginning. Had to do. Therefore, when changing or adding the communication line settings, it was necessary to reset all the communication lines set up in the system.

[0004]

Therefore, it is necessary to momentarily disconnect the entire system every time the communication line is changed.
Therefore, in the case of changes / additions, there is a problem that the communication line that is currently in operation and is not the target of the changes / additions is also momentarily disconnected.

The present invention has been made in view of the above problems, and an object of the present invention is to change a communication line.
Even if an addition or the like occurs, it is to prevent a momentary interruption from occurring on a line that is not a change target.

[0006]

FIG. 1 is a diagram illustrating the principle of the present invention. The time slot automatic allocation method of the present invention relates to a communication line in which a physical connection does not change before and after a change in a communication line in a communication system for performing communication by multiplexing with a time slot. The allocation of the currently used time slot is continued as it is, and the time slot is reallocated only for the communication line whose physical connection is changed.

The time slot automatic allocation method of the present invention is the same as the time slot automatic allocation method described above,
When the deleted physical connection is restored after deleting the physical connection of a certain communication line, the restored physical connection is set in the time slot that was assigned before the deletion of the communication line set for the deleted physical connection. It is characterized in that the communication line set for the physical connection is allocated.

[0008]

In (1) of FIG. 1, A, B, C, D, and E are communication devices, but when the communication system is newly set, the E device does not exist and the A, B, C, and D devices are used as the system. Was configured. In this case, as shown in (2) of FIG. 1, the physical connection is the time slot TS1 for the communication line between the A and B devices, and the physical connection is the time slot TS2 for the communication line between the A and C devices. , Physical connection is A
The communication lines between the -D devices are assigned to the time slots TS3, respectively.

Now, for example, the C device is deleted, and then E
It is assumed that there is a change that adds a device. In this case, A
The time slot TS2 assigned to the communication line set up for the physical connection between the -C devices is made an unused time slot. After that, as shown in (3) of FIG. 1, the communication line set for the physical connection between the added A-E devices can be assigned to the time slot TS2. The time slots already assigned to the communication line between the B-device and the communication line between the A-D devices are not changed.

When the C device is restored due to the fact that the deletion of the C device is incorrect, etc., the physical connection between the A and C devices related to the restored C device is set. Connect the communication line to AC before deleting the C device.
By reallocating to the time slot that has been allocated to the communication line between the devices, the physical connection of the line does not change before and after the deletion / restoration, so that the instantaneous disconnection of the line can be prevented.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A time slot automatic allocation method as an embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 shows a structural example of a communication system in which the time slot automatic allocation method of the embodiment is used.
The communication system of FIG. 2 shows a state when a new line is set in which a communication line has not been deleted, changed or added. In FIG. 2, A, B, C, and D are communication devices each having a multiplexing transmission function. The communication devices are connected in a loop by an optical transmission line, and individual communication lines are set between the devices by the time slots on the optical transmission line.

FIG. 3 shows a current time slot allocation status file for explaining a current time slot use state in the communication system of FIG. Here, one square is set as one unit (minimum unit) of a time slot, and a blank portion indicates that the time slot is unused. As shown in the figure, in this example, one time slot is used for one communication line, and for the physical connection between the A device and the B device, a communication line is set and this communication line is time slotted. TS1 is assigned, a communication line is set for a physical connection between the A device and the C device, and this communication line is assigned to the time slot TS2.
A communication line is set for the physical connection between the A device and the D device, and this communication line is assigned to the time slot TS3.

FIG. 4 shows the state of the communication system when the device C is deleted from the above communication system and the communication line is lost, and the line information between the devices A and C is deleted from the current time slot allocation status file. Also shown in FIG. 5 is a current time slot allocation status file showing the time slot allocation in that case.

As shown in FIG. 5, the time slot T
The communication line is allocated to S1 and the communication line is allocated to the time slot TS3 in the same manner as before the communication line was deleted, but the communication line allocated to the time slot TS2 is deleted and the time slot TS2 is deleted.
Is unused.

Here, in the conventional allocation method, the A device-
When the communication line between the C devices is deleted, the process of allocating the communication line between the A device and the D device to the time slots TS3 to TS2 is performed, but in the present invention, the communication between the A device and the C device is performed. Allocation other than line, that is, communication line of time slot TS1, time slot T
The S3 communication line allocation will not be changed.

FIG. 6 shows the state of the communication system when the E device is newly added to the communication system with the C device deleted, and FIGS. 7 and 8 show the time slot allocation in that case. Shows the current timeslot allocation status file shown. In this case, for the physical connection between the A-device and the B-device, for the physical connection between the A-device and the B-device, so that the line allocation for the unchanged communication line is the same as before the addition. For example, the communication lines are set to the same as before the addition, and those communication lines are respectively assigned to the same time slots TS1 and TS3 as before the addition.

Then, as shown in FIG. 7, a communication line is set up for the newly added physical connection between the A device and the E device, and this communication line is not used because the C device is deleted. Assigned to the time slot TS2. In addition,
If the time bandwidth of the newly provided communication line between the A-device and the E-device is wide and one time slot TS2 is insufficient, another communication time slot is used.
For example, as shown in FIG. 8, two time slots TS4,
Allocate to TS5.

Further, in FIG. 9, communication when the C device is restored because it was found that the deletion of the C device was incorrect immediately after the process of deleting the C device and adding the E device was performed. The system is shown and a current time slot allocation status file is shown in FIG. 10 showing the time slot allocation in that case. As shown in the figure, the communication line between the A-device and the B-device that does not change is
The communication line between the device and the D device is assigned to each of the time slots TS3.

On the other hand, with respect to the newly added E device, a communication line is set up for the physical connection between the A device and the E device, and the deletion is erroneous.
It is assumed that a communication line is set up for the physical connection between the device and the device C. In this case, when the communication line is assigned to the time slot TS2, the state of the physical connection is changed from the A device-C device to the A device-E device, so that a momentary interruption occurs. Therefore, a communication line is allocated to the time slot TS2 so that the physical connection state does not change before and after the change. Further, the communication line relating to the newly added E device is assigned to the time slot TS4.

With the above arrangement, the position of the time slot is not changed with respect to the unchanged communication line that is not the change target, so that even if the communication line is changed or added, the communication that is not the change target is changed. It is possible to continue communication without interrupting the line.

FIG. 11 shows a structural example of an apparatus for performing the above-described time slot automatic allocation method. This device is provided in a supervisory controller (not shown) located in the communication system.

In FIG. 11, reference numeral 1 is a manager function unit, and 2 is a manager function unit.
Is a line definition function part, 3 is a time slot allocation function part,
Reference numeral 4 is a line definition file, 5 is a changed line file, 6 is a definition file for the number of time slots used by speed, 7 is a current time slot allocation status file, and 8 is a time slot allocation file.

This manager function unit 1 is an H
It has a function of managing the MI function and activating the corresponding function according to the operation of the operator.

The line definition function unit 2 has a function of creating setting information of a communication line defined in the system. Further, it has a function of writing the line information changed by the operator to the line definition file 4, and then writing only the changed line information to the changed line file 5.

The manager function unit 1 which has received the end notification from the line definition function unit 2 is adapted to apply the activation processing to the time slot allocation function unit 3.

The time slot allocation function unit 3 refers to the current time slot allocation status file 7, the changed line file 5, the speed-specific time slot number definition file 6,
Reassign time slots only to the changed communication line. After the reallocation of time slots, the time slot allocation file is written in the current time slot allocation status file.

FIG. 12 shows a flow chart of the time slot automatic allocation processing. The time slot automatic allocation will be described with reference to FIG. 7. A line change request (update, update,
If there is addition or deletion (step S1) (step S1), the manager function part 1 activates the line definition function part 2 (step S2). The line definition function unit 2 performs a communication line change process (step S3), writes the changed line information in the line definition file 4 (step S4), and further writes only the changed line information in the changed line file 5. (Step S5), the manager function unit 1 is notified of the end.

When the manager function unit 1 receives the end notification,
The time slot allocation function unit 3 is activated (step S6). As a result, the time slot allocation function unit 3 judges the contents of the change (step S7), and judges whether it is an update / addition or a deletion.

In the case of updating / adding, the changed line file 5, the speed-specific time slot number definition file 6, and the current time slot allocation status file 7 are referred to (steps S8 to S10), and the communication line involved in the update / addition is determined. An empty time slot suitable for allocation is searched (step S11), and only the changed line is reallocated to the time slot allocation file 8 accordingly.

On the other hand, as a result of the change processing judgment, if the file is deleted, the changed line file 5 and the current time slot allocation status file are referred to (steps S13 and S14),
The time slot to be deleted is changed to the unused state (step S15).

Thereafter, the line information reassigned in step S12 or the line information changed in step 15 is written in the current time slot assignment status file (step S16), and the process ends (step S17).

[0033]

As described above, according to the present invention, even if a communication line is changed or added, the communication line that is not the target of the change can continue communication without interruption. It will be possible. This greatly contributes to the improvement of system reliability and the effective use of communication lines.

[Brief description of drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is a diagram showing a communication system in the case of a new line that has not been changed or added for explaining the time slot automatic allocation method as one embodiment of the present invention.

3 is a diagram showing a current time slot allocation status file showing time slot allocation in the case of FIG. 2;

FIG. 4 is a diagram illustrating a communication system in the case where a communication line is deleted for explaining an example method.

FIG. 5 is a diagram showing a current time slot allocation status file showing time slot allocation in the case of FIG. 4;

FIG. 6 shows a communication line deleted to explain the method of the embodiment.
It is a figure which shows the communication system at the time of being added.

FIG. 7 is a diagram showing a current time slot allocation status file showing time slot allocation in the case of FIG. 6 (when one time slot is used);

8 is a diagram showing a current time slot allocation status file showing time slot allocation in the case of FIG. 6 (in the case of using a plurality of time slots).

FIG. 9 is a communication line deleted to explain the method of the embodiment.
It is a figure which shows a communication system in case a deleted line is restored immediately after being added.

FIG. 10 is a diagram showing a current time slot allocation status file showing time slot allocation in the case of FIG. 9;

FIG. 11 is a diagram showing an example of the configuration of an apparatus that performs an example method.

FIG. 12 is a flowchart showing a processing procedure of an embodiment method.

[Explanation of symbols]

 1 manager function part 2 line definition function part 3 time slot allocation function part 4 line definition file 5 changed line file 6 number of time slots used by speed definition file 7 current time slot allocation status file 8 time slot allocation file

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinya Kimura 3-9-18 Shin-Yokohama, Kohoku-ku, Yokohama-shi, Kanagawa Prefecture Fujitsu Communication Systems Limited (72) Inventor Ken Takahashi 3 Shin-Yokohama, Kohoku-ku, Yokohama-shi, Kanagawa 9-9-18 Fujitsu Communication Systems Limited (72) Inventor Akira Yoneyama 3-9-18 Shin-Yokohama, Kohoku-ku, Yokohama, Kanagawa Prefecture 3-9-18 Fujitsu Communication Systems Limited (72) Inventor Yuji Kawada Kanagawa 3-9-18 Shin-Yokohama, Kohoku-ku, Yokohama-shi Fujitsu Communication Systems Limited

Claims (2)

[Claims] 1. In a communication system for performing communication by multiplexing with time slots, when there is any change in a communication line, physical connection (AB, AC, AD) is made before and after the change. ...) does not change, the allocation of the currently used time slots (TS1, TS2, TS3 ...) is continued and the time slot is allocated only to the communication line whose physical connection has been changed. Automatic time slot allocation method characterized by re-allocation. 2. A time slot in which a communication line set for the deleted physical connection is allocated before the deletion when the deleted physical connection is restored after the physical connection of the communication line is deleted. 2. The automatic time slot allocation method according to claim 1, wherein the communication line set for the restored physical connection is allocated to the above.