JPH0221706B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a system fault handling method, and more particularly to a system fault handling method in a multiprocessor controlled electronic switching system in which switching control functions are shared among a plurality of control system devices.

FIG. 1 is a diagram showing an example of a multiprocessor-controlled electronic switching system to which the present invention is applied. In FIG. 1, a plurality of control system devices 11 to 1k
are communication path system devices 2 each accommodating a communication line.
Shares the exchange control function for 1 to 2k. When exchange control is related to a plurality of control system devices 1i and 1j (i and j are each one of 1 to k, where i≠j), the control system devices 1i and 1j are controlled by the communication control device 4. The exchange control information is exchanged via the bus 3. In addition, FIG. 5 is a diagram showing an example of exchange control information, and as shown in the figure, the call status indicating the phase of the call such as empty, ringing, or communicating, and the line between communication path equipment are shown. The exchange control information is composed of the line number of the line between communication path equipment, which is the line number, the communication speed, and the terminal type indicating the type of terminal, such as whether it is a home terminal or a public terminal. It is created for each call and managed by the corresponding control system device. Now, if a failure occurs in such a multiprocessor control electronic exchange system, all or some of the control system devices 11 to 1k temporarily suspend the exchange control operation, and after repair, initial settings of programs and data are performed. After that, it will be restarted. Thereafter, each of the control system devices 11 to 1k executes call relief processing based on the switching control information 111 to 1k1 held at the time of interruption of the switching control operation, and strives to maintain the switching service as much as possible. However, even if the exchange control information 111 to 1k1 held by each control system device 11 to 1k is related to the same call, the exchange control information 111 to 1k1 held by each control system device 11 to 1k may be affected by differences in processing processes that exist between control system devices, or by control system devices passing through the bus 3. Delays due to intercommunication, and furthermore, exchange control information 111 to
Due to a failure in the storage unit of k1, etc., consistency is not necessarily achieved. Based on the exchange control information 111 to 1k1 in such an inconsistent state, each control system device 1
Even if 1 to 1k carry out call relief processing, there will be no contact,
Since this may result in incorrect connection, etc., and eventually disrupt the exchange service, it is necessary to mutually match the required exchange control information held by each control system device 11 to 1k at the time of failure recovery. That is, 1
When a single call is exchanged across a plurality of control system devices, normal exchange processing cannot be performed unless the exchange control information among the respective control system devices is consistent, so it is necessary to make them consistent with each other. For this reason, in conventional multiprocessor control electronic exchange systems, specific control system devices (for example, one
1) In most cases, the matching processing of exchanged control information among all the control system devices 11 to 1k is carried out in a concentrated manner. In such a case, the specific control system device 11 needs to manage the exchange control information 111 to 1k1 of all the control system devices 11 to 1k, which is a feature of the multiprocessor control electronic exchange system. This results in loss of independence among the control system devices 11 to 1k. As a countermeasure, it is considered that each of the control system devices 11 to 1k exchanges control information with each other via the bus 3 and executes the matching process independently, but this would make the matching process complicated and take time. There were some shortcomings, such as being slow.

It is an object of the present invention to eliminate the drawbacks of the conventional system fault handling methods as described above, and to provide a multiprocessor-controlled electronic switching system without sacrificing the features thereof.
The object of the present invention is to ensure and quickly match exchange control information held by each control system device.

The purpose of this is to enable the multiprocessor-controlled electronic switching system to perform fault recovery in a multiprocessor-controlled electronic switching system in which switching control functions are shared between multiple control system devices and communication path devices corresponding to the control system devices. At this time, information on the lines between communication path system devices is obtained by selecting information that has been determined in advance to interfere with the operation of the switching control function if mutual consistency is not achieved from the switching control information held by each control system device. The line number, the exchange control information requiring consistency, and the priority indicating whether the reliability of the exchange control information requiring consistency is high or low are sent to a failure handling mechanism centrally provided within the multiprocessor controlled electronic exchange system. A transmission means for transmitting the information is provided in each control system device, and the fault handling mechanism verifies whether or not the matching exchange control information of the same line number received from each control system device is consistent with each other, and performs matching. When the matching is achieved, the matching result is used, and when the matching is not achieved and the priorities are different, the matching result is used for the high priority matching exchange control information, and the matching result is used for the matching exchange control information with the lower priority. For matching exchange control information, the matching result that cannot be matched and the matching exchange control information with high priority as correction instruction information are sent to the control system device corresponding to the communication system device connected to the line with the same line number. By sending the information back, the control system device can modify the matching exchange information it holds and modify the state of the communication path system device based on the modification instruction information.

An embodiment of the present invention will be described below with reference to FIGS. 2 and 3. FIG. 2 is a diagram showing a system failure handling method according to an embodiment of the present invention, and FIG. 3 is a diagram showing the configuration of matching registration information and matching result information in FIG. 2. Note that the same reference numerals indicate the same objects throughout the figures. In FIG. 2, each control system device 110 to 1k1 has a matching necessity judgment for identifying whether or not it is necessary to match the exchange control information held by the exchange control information held by other control system devices 110 to 1k0. A table 101 is provided. This table was determined at the time of system construction that if the exchange control information is as shown in Figure 5, it will cause problems in the exchange process if it is not matched.
For example, call status, line number of line between communication path equipment,
It is created as shown in FIG. 6 by assigning 1 indicating that matching is required to No. 1 to No. 3 corresponding to the communication speed, and 0 indicating matching not to No. 4, which corresponds to the communication speed. A fault handling mechanism 6 is connected that centrally performs matching processing of exchange control information transmitted from each control system device 110 to 1k0. When all or some of the control system devices 110 to 1k0 whose replacement control operations have been interrupted due to a failure in the multiprocessor control electronic exchange system are restarted after the failure is repaired, each control system device 110 to 1k0 is restarted after the failure is repaired. The initial setting mechanism 102 of 1k0 verifies the normality of the exchange control information 111 to 1k1 held, refers to the matching necessity determination table 101, selects exchange control information that requires matching, and connects the corresponding line. It is transmitted to the interface units 51 to 5k together with the number, priority, etc. Here, in the case of a control system device that has encountered a failure, the priority is set to 0, for example, since the reliability of the exchange control information held is low. However, if no obstacle is encountered (another control device becomes an obstacle,
If the exchange control information is restarted due to repair), the reliability of the exchange control information held is considered to be high, and the priority is set.
For example, set it to 1. Interface parts 51 to 5k
to communicate. The interface units 51 to 5k create matching registration information 501 based on the received exchange control information, etc.
is configured and transmitted to the fault handling mechanism 6 via the bus 3. As shown in FIG. 3, the matching registration information 501 is composed of a line number 511 of a line between communication path system devices, matching exchange control information 512, and priority level 513. Here, since matching registration information is created for each line number, the line number becomes key information when performing matching. The required matching exchange control information consists of the call status and communication speed excluding the line number shown in FIG. The failure processing mechanism 6 receives matching registration information 50 from each interface unit 51 to 5k.
1 is stored in the matching registration table 61, and the matching mechanism 6
2, matching exchange control information 512 included in matching registration information 501 having the same line number 511
and determine whether they are consistent with each other. As a result of the determination, if the matching is found, the matching mechanism 62 outputs a matching result, and if the matching is not found, the priorities are compared, and if the priorities are different, matching exchange control information with a high priority is output. For the matching exchange control information with the same priority, the matching result is displayed as the matching result, and the matching exchange control information with the same priority is used as the correction instruction information. In this case, for example, the priority level is determined by allocator processing, and the same processing as described above is performed, and the obtained verification results and correction instruction information are respectively output. Furthermore, when matching is impossible, such as when the communication speeds do not match, both a matching result indicating that matching is not possible and correction instruction information for emptying the call status are output. The failure processing mechanism 6 forms verification result information 502 based on the output of the matching mechanism 62, and sends it back to the two interface units corresponding to communication path devices connected to the verified lines with the same line number. As shown in FIG. 3, the verification result information 502 is composed of a verification result 514 including a line number 511, matching exchange control information 512, and modification instruction information. When each interface unit 51 to 5k transmits the received verification result information 502 to the control system devices 110 to 1k0, the initial setting mechanism 102 updates the exchange control information 111 based on the correction instruction information included in the received verification result information 502.
After making the necessary corrections to the exchange control information 111 to 1k1, the communication path system equipment is re-driven to match the states of the communication path system equipment and the control system equipment, and then call relief processing is performed. Execute.

As is clear from the above description, according to this embodiment, among the exchange control information 111 to 1k1 held by each control system device 110 to 1k0, the necessity of matching is determined for the exchange control information 512 that requires mutual matching. The failure handling mechanism 6 is sorted by the table 101.
The matching process is executed by each control system device 110.
Call relief processing can be performed for the calls 1k0 to 1k0 based on the matched exchange control information 111 to 1k1.

Note that FIGS. 2 and 3 are only one embodiment of the present invention, and for example, the fault handling mechanism 6 is not limited to being connected to the bus 3 independently.
Although many modifications are considered, such as adding this mechanism to the communication control device 4 and implementing it as a communication control device 7 with a failure handling mechanism as shown in FIG. 4, the effects of the present invention do not change in any case. . Also, matching registration information 5
The configurations of 01 and verification result information 502 are not limited to those shown in FIG. 3, and many other modifications may be considered, but the effects of the present invention remain the same in either case. Furthermore, it goes without saying that the configuration of the multiprocessor-controlled electronic switching system to which the present invention is applied is not limited to that shown in the drawings.

As described above, according to the present invention, exchange control information held by a plurality of control system devices constituting a multiprocessor control electronic exchange system can be reliably and quickly matched, while the independence of the control system devices is impaired. Not possible.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of a multiprocessor-controlled electronic switching system to which the present invention is applied, FIG. 2 is a diagram showing a system failure handling method according to an embodiment of the present invention, and FIG. FIG. 4 is a diagram showing the structure of matching registration information and verification result information, FIG. 4 is a diagram showing a system failure handling method according to another embodiment of the present invention, FIG. 5 is a diagram showing an example of exchange control information, and FIG. FIG. 3 is a diagram illustrating an example of a matching necessity determination table. In the figure, 11 to 1k and 110 to 1
k0 is a control system device, 21 to 2k are communication path devices, 51 to 5k are interface sections, 3 is a bus, 4 is a communication control device, 6 is a failure handling mechanism, 7 is a communication control device with a failure handling mechanism, 111 ~1k1
is exchange control information, 101 is a matching necessity determination table, 102 is an initial setting mechanism, 501 is matching registration information, 502 is matching result information, 511 is a line number,
512 is matching exchange control information, 513 is priority,
514 is the matching result, 61 is the matching registration table, 6
2 indicates an alignment mechanism.

Claims (1)

[Scope of Claims] 1. In a multiprocessor-controlled electronic switching system in which switching control functions are shared between a plurality of control system devices and communication path devices corresponding to the control system devices, the multiprocessor-controlled electronic switching system comprises: During failure recovery, communication path equipment is obtained by selecting information that has been determined in advance to interfere with the operation of the switching control function if mutual consistency is not achieved from the switching control information held by each control system equipment. A failure is provided in which the line number of the communication line, the exchange control information that requires matching, and the priority indicating whether the reliability of the exchange control information that requires matching is high or low is concentrated in the multiprocessor-controlled electronic switching system. A transmission means for transmitting to the processing mechanism is provided in each of the control system devices, and the failure processing mechanism verifies whether or not the matching exchange control information of the same line number received from each of the control system devices is consistent with each other. When consistency is achieved, a matching result is given, and when there is no matching and the priorities are different, a matching result is given for matching exchange control information with a high priority, and a matching result is given as a priority. For the exchange control information that requires matching with a low priority, the matching result that cannot be matched and the exchange control information that requires matching that has a high priority as correction instruction information are used for control corresponding to communication equipment connected to the line with the same line number. A system failure handling method characterized in that the control system device corrects the matching exchange information held by the control system device and corrects the state of the communication path system device based on the correction instruction information by sending the information back to the system device.