JP5964762B2 - Operation system, alarm monitoring method, and program for causing computer of operation system to execute alarm monitoring method - Google Patents

Description

  The present invention relates to an operation system, an alarm monitoring method, and a program for causing an operation system computer to execute the alarm monitoring method, and more particularly, an operation capable of providing a smooth service even when a failure occurs in access to a migration destination database. The present invention relates to a system, an alarm monitoring method, and a program for causing an operation system computer to execute the alarm monitoring method.

  Network devices (hereinafter referred to as NE as appropriate) such as radio system devices, exchanges, and transmission devices constituting a communication network are generally monitored by an operation system. As shown in Non-Patent Document 1 below, a conventional operation system is provided with a server that collects and aggregates alarms from each NE and performs various processes (hereinafter, appropriately referred to as an NE aggregation server). An alarm from each NE is displayed on a display such as a console via the NE aggregation server. Thereby, the maintenance person can grasp | ascertain the alert generation condition from all NE. When the NE aggregation server receives an alarm (including an autonomous message) from each NE, the NE aggregation server performs a predetermined process, displays the alarm on the maintenance terminal, and notifies the maintenance person. The maintenance person confirms the alarm state of each displayed NE, and then comprehensively determines and performs congestion control.

As described above, when the judgment of the maintenance person is included in the judgment of the congestion state, there is a problem that it takes time until the congestion control is started after the congestion occurs. Therefore, as in Non-Patent Document 1 below, for example, an automated congestion control that manages a processing queue for each NE and triggers the start of congestion control when the number of processing queues exceeds a certain threshold. A configuration of
However, a method for automatically canceling congestion control for determining congestion state and releasing congestion at a suitable timing has not been sufficiently established. Also, if only the start of congestion control is automated and the release is performed manually, the maintenance person may not know that the congestion control has already started and may delay the decision to release the congestion control. is there. Therefore, in order to automate the start of the congestion control, it is necessary to automate the cancellation of the congestion control.

  In response to such a request, Patent Document 1 below proposes a congestion control device that counts the number of NE monitoring information collected in a predetermined unit time and performs congestion control based on the number of monitoring information. Has been. In the congestion control apparatus disclosed in Patent Document 1, when the coefficient result of the number of monitoring information exceeds a predetermined detection threshold, it is determined that there is a high possibility that a burst notification of the monitoring information has occurred (paragraph). [0051]). Further, when the coefficient result of the number of monitoring information falls below a predetermined cancellation threshold, it is determined that the burst notification of the monitoring information has ended, and congestion control is canceled (paragraph [0052]).

JP 2009-194620 A

Takada et al., NE monitoring method for large-scale disasters, IEICE technical report, vol. 111, no. 488, ICM2011-49, pp. 7-12, March 2012

  However, in the congestion control device of Patent Document 1, the monitoring information collection unit collects all of the monitoring information, and all the monitoring information is stored in the monitoring information storage unit. For this reason, even when there is a burst of monitoring information notification from all NEs, it is necessary to receive an enormous number of monitoring information, and there is a possibility that it will take time to cancel the congestion control of the processing in the congestion control device. is there. In order to cope with this, when the operation system refuses to receive the monitoring information from each NE or suppresses the monitoring information notification itself from the NE, the monitoring information notified from the NE on the operation system side The number cannot be suitably predicted, and there arises a problem that the timing for canceling the congestion control cannot be appropriately determined. In addition, as described in Non-Patent Document 1, although it may be possible to adopt a configuration in which alarm transmission suppression control is performed only for NEs in which congestion occurs, for example, as in the case of a major disaster, one It is not suitable for a state in which all NEs in the operation system are congested for a long time.

In addition, when the decision to cancel the congestion control is made based only on the number of alarms received from each NE, the operation system is likely to fall into the congestion state again.
The present invention has been made in view of the above points, and is an operation system capable of automating the start and release of congestion control when congestion occurs in the operation system and releasing the congestion control at a suitable timing. An object of the present invention is to provide an alarm monitoring method and a program for causing an operation system computer to execute the alarm monitoring method.

In order to achieve the above object, an operation system according to an aspect of the present invention is an operation system for managing a plurality of network elements constituting a communication network.
Congestion state determination for determining a congestion state of the operation system (operation system 100 in FIG. 1) based on the number of alarms notified from the network element (network element (NE) 110 (110a to 110e) in FIG. 1). (Congestion state determination unit 40 in FIG. 1),
When the congestion state determination unit determines that the operation system is in a congestion state, instead of receiving an alarm notification from the network element, the plurality of network elements are accessed, An alarm state acquisition unit (alarm state acquisition unit 50 in FIG. 1) that acquires an alarm state indicating whether each of the network elements is in a normal state or an abnormal state;
When the alarm state of the network element acquired from a plurality of the network elements is compared with the alarm state of the network element acquired last time, and the alarm state changes from a normal state to an abnormal state or from an abnormal state to a normal state First, the number of alarm state changes of the plurality of network elements to be counted is obtained, and based on the number of alarm state changes, a first determination is made as to whether or not the plurality of network elements are in a first decongestable state After it is determined in the congestion release determination and the first congestion release determination that the first congestion release is possible, an alarm is issued from a part of the network elements of which the alarm notification suppression is canceled out of the plurality of network elements. Based on the number of alarms received and notified from the some network elements, the other network A second congestion removal determination determines whether network elements in a congestion releasable state, the congestion control cancel determination unit for performing (congestion control cancel determination unit 60 of FIG. 1),
Based on the determination of the congestion state determination unit and the congestion control cancellation determination unit, an alarm notification suppression / cancellation unit that requests the network element to suppress alarm notification or cancel alarm notification suppression (alarm notification in FIG. 1) And a deterrence / release unit 70).

In such a configuration, when the determination of the release of the congestion state is automatically made, the determination criterion is divided into two stages, so that it is possible to automate the start and release of congestion control when congestion occurs in the operation system. The congestion control can be released at a proper timing.
In addition, an alarm receiver (alarm receiver 20 in FIG. 1) that receives the alarm notified from the network element,
When the congestion state determination unit detects that the number of alarms staying in the alarm reception unit exceeds the first threshold for a certain time, it can be determined that the congestion state is present.

  In such a configuration, in order to determine whether there is a congestion state based on the number of alarms that are difficult to process and stay in the operation system, compared to the case where the determination is made only by the number of alarms received by the operation system, Judgment more suitable for the operation system can be made.

The alarm notified from the network element includes a plurality of the alarm receivers (classified alarm receivers A20a to E20e in FIG. 1) that are classified and received for each network element,
In the congestion state determination unit, the total number of alarms that can be processed in the entire operation system and the number of alarms that can be processed in each of the alarm reception units provided for each network element are set,
The congestion state determination unit,
The total number of alarms staying in the alarm receiving unit exceeds the total processable alarm number, and the number of alarms staying in one of the alarm receiving units exceeds the unit processable alarm number. If at least one of the above is detected, it can be determined that the state is congested.

In such a configuration, since the congestion state is detected by both the processing capability of the entire operation system and the processing capability of the alarm receiving unit corresponding to each NE, many NEs generate alarms over a long period of time. Efficient hardware design becomes possible between the alarm monitoring at the time of alarm and the alarm monitoring at the normal time.
The congestion control release determination unit
When the obtained number of alarm state changes of the plurality of network elements is equal to or less than the second threshold value, it may be determined that the plurality of network elements are in a first congestion release enabled state.

In such a configuration, predicting the state of the entire accommodated network element is the first stage of congestion release, so that the operation system is prevented from falling into a congestion state again.
The congestion control release determination unit
When the number of alarms received from the part of the network elements whose alarm notification suppression is canceled is equal to or less than the third threshold value, it may be determined that the network element shifts to congestion cancellation of the other network elements.

In such a configuration, after satisfying the condition of the first stage, the second stage is to acquire the number of alarms of a specific network element and determine whether or not the release of the congestion state is appropriate. The operation system is prevented from falling into a congestion state again.
Further, the part of the network elements that perform the alarm notification suppression release may be selected based on at least one of the number of state changes of the network element and the number of stay alarms immediately before the alarm notification suppression.

In such a configuration, when the number of alarms of a specific network element is confirmed, it is possible to make a congestion release determination in accordance with the actual state of the network element.
Further, a network element state management unit (NE state management unit 30 in FIG. 1) that manages at least one of the number of alarm state changes for each network element and the number of staying alarms immediately before alarm notification suppression may be provided.

In such a configuration, since the elements necessary for determining the congestion state are managed by the network element state management unit, the congestion state determination unit and the congestion control release determination unit determine the congestion only by referring to the network element state management unit. Can do.
In addition, the congestion control release determination unit is a range in which the total number of alarm state changes is equal to or less than a fourth threshold based on the number of alarm state changes for each network element managed by the network element state management unit. At least one of the network elements selected in (1) may be the part of the network elements that perform alarm notification suppression release.

  In such a configuration, when the actual number of alarms of the selected NE is small, only the NE that is likely to be the cause of congestion is suppressed by repeating the process of canceling the alarm notification suppression. Can continue to focus on monitoring of the NE. In addition, it is highly possible to acquire warnings that are equal to or less than the number of alarms that can be reliably processed in advance, and it is possible to focus on monitoring NEs that are highly likely to cause congestion without falling into a congestion state again. .

Further, the part of the network elements that perform the alarm notification suppression release can be selected based on the type of the network element and the arrangement position of the network element with respect to the mobile terminal.
In such a configuration, a specific alarm may be notified for each type of network element, and if the number of alarms of the selected NE is stable, it is determined that the number of alarms of other NEs is also stable. Can do. For this reason, it is possible to prevent the operation system from entering the congestion state again after the congestion control is canceled.

To achieve the above object, an alarm monitoring method according to an aspect of the present invention provides an alarm monitoring method in an operation system that monitors alarms from a plurality of network elements constituting a communication network.
Based on the number of alarms notified from the network element, determine the congestion state of the operation system,
If it is determined that the state is congested, the network element is requested to suppress the alarm notification, and instead of receiving the alarm notification from the network element, the plurality of network elements are accessed. Obtaining an alarm state indicating whether each of the plurality of network elements is in a normal state or an abnormal state;
When the alarm state of the network element acquired from a plurality of the network elements is compared with the alarm state of the network element acquired last time, and the alarm state changes from a normal state to an abnormal state or from an abnormal state to a normal state First, the number of alarm state changes of the plurality of network elements to be counted is obtained, and based on the number of alarm state changes, a first determination is made as to whether or not the plurality of network elements are in a first decongestable state Perform congestion release judgment,
When it is determined in the first congestion cancellation determination that the first congestion cancellation determination state is present, a request to cancel the suppression of alarm notification is issued to a part of the plurality of network elements,
An alarm is received from a part of the network elements of which the alarm notification suppression is canceled among the plurality of network elements, and based on the number of the alarms notified from the part of the network elements, the other network elements A second congestion release determination is performed to determine whether or not the congestion release is possible.
When it is determined in the second congestion cancellation determination that the congestion of the network element is to be canceled, the network element that is suppressing the alarm notification is requested to cancel the alarm notification suppression.

In order to achieve the above object, a program for causing a computer of an operation system to execute an alarm monitoring method according to an aspect of the present invention provides an alarm monitoring method for monitoring alarms from a plurality of network elements constituting a communication network. In a program to be executed by a computer,
A process of determining a congestion state of the operation device based on the number of alarms notified from the network element;
If it is determined that the state is congested, the network element is requested to suppress the alarm notification, and instead of receiving the alarm notification from the network element, the plurality of network elements are accessed. A process of obtaining an alarm state indicating a state of each of the plurality of network elements being in a normal state or an abnormal state;
When the alarm state of the network element acquired from a plurality of the network elements is compared with the alarm state of the network element acquired last time, and the alarm state changes from a normal state to an abnormal state or from an abnormal state to a normal state First, the number of alarm state changes of the plurality of network elements to be counted is obtained, and based on the number of alarm state changes, a first determination is made as to whether or not the plurality of network elements are in a first decongestable state A process for determining congestion release;
When it is determined in the first congestion cancellation determination that the state is in the first congestion cancellation determination state, a process for requesting cancellation cancellation of alarm notification to a part of the plurality of network elements;
An alarm is received from a part of the network elements of which the alarm notification suppression is canceled among the plurality of network elements, and based on the number of the alarms notified from the part of the network elements, the other network elements A process of performing a second congestion release determination for determining whether or not the congestion release is possible;
A process for requesting the network element that is suppressing the alarm notification to cancel the alarm notification suppression when it is determined in the second congestion cancellation determination that the congestion of the network element is to be canceled. Features.

  According to the present invention, it is possible to automate the start and release of congestion control when congestion occurs in the operation system, and to release the congestion control at a suitable timing.

It is the schematic which shows the structure of the operation system by one aspect | mode of this invention which manages the some network element which comprises a communication network. It is the schematic which shows operation | movement of the operation system by 1 aspect of this invention at the time of normal monitoring. It is the schematic which shows the 1st operation | movement of the operation system by one aspect | mode of this invention in congestion control. It is the schematic which shows the 2nd operation | movement of the operation system by one aspect | mode of this invention in congestion control. It is a figure which shows the acquisition method according to the function of the alarm state change number in the operation system by 1 aspect of this invention. It is a sequence chart which shows the operation | movement in the operation system by 1 aspect of this invention. It is a figure explaining the specific example of the specific NE selection method in the operation system by 1 aspect of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
1. Operation system configuration (Overall operation system configuration)
FIG. 1 is a schematic diagram showing a configuration of an operation system 100 that manages a plurality of network elements constituting a communication network to which the present invention is applied.
The operation system 100 includes an interface unit 10, an alarm receiving unit 20, a network element state management unit (hereinafter appropriately referred to as an NE state management unit) 30, a congestion state determination unit 40, an alarm state acquisition unit 50, a congestion A control cancellation determination unit 60, an alarm notification suppression / cancellation unit 70, and a control unit 80 are provided. The alarm reception unit 20 and the network state management unit 30 are state management function units of the operation system 100. The congestion state determination unit 40, the alarm state acquisition unit 50, the congestion control release determination unit 60, and the alarm notification suppression The cancellation unit 70 is a congestion management function unit of the operation system 100.

  The operation system 100 is a system that centrally aggregates a huge amount of NEs 110 (NE (A) 110a to NE (E) 110e) and performs monitoring control of each NE 110. The total number of NEs 110 monitored and controlled by one operation system 100 is, for example, tens of thousands of nodes. In the operation system 100, it is necessary to accommodate as many NEs 110 as possible. In order to manage and control these many NEs 110, each unit described below is provided.

FIG. 2 is a diagram illustrating the operation of the operation system 100 during normal monitoring. The operation system 100 acquires an alarm notified from the NE 110 and performs alarm processing.
FIG. 3 is a diagram illustrating a first operation of the operation system 100 during congestion control (when a congestion state occurs). The operation system 100 suppresses alarm notifications from all the NEs 110, transmits an NE 110 status acquisition request to the NE 110, and based on the acquired status, the first congestion that is the first stage of congestion control cancellation Perform release determination.

  FIG. 4 is a diagram illustrating a second operation of the operation system 100 during congestion control (when a congestion state occurs). The operation system 100 cancels the suppression of the alarm notification for some NEs 110 when the first congestion cancellation determination satisfies the condition of the first stage of congestion control cancellation, and notifies the alarms acquired from some NEs 110. The second congestion release determination which is the second stage of congestion control release is performed based on the above.

Hereinafter, the operation system 100 and the network element 110 monitored by the operation system 100 will be described with reference to FIGS.
(Network element)
The network element (NE) 110 is a wireless system device, an exchange, a transmission device, or the like that constitutes a communication network, and equipment monitoring is performed by the operation system 100. Each of NE (A) 110a to NE (E) 110e has one or a plurality of functions, and “normal state” in which processing is normally performed for each function, and processing is not normally performed. It is classified into any state of “abnormal state” (hereinafter referred to as an alarm state as appropriate). Even if a slight delay occurs in the process, the alarm state may be determined as “normal state” as long as the delay is within a functionally acceptable range.

  The NE 110 has different functions, installation locations, installation policies, and opposing NEs for each type. The functions of the NE 110 include a modulation / demodulation function, an amplification function, a concealment function, a handover switching control function, and the like. Further, the installation location and installation policy of the NE 110 may be either centralized installation or distributed installation, indoor installation, outdoor installation, or the like. For this reason, the NE 110 notifies an alarm having a different property for each type. Each of the NEs 110 outputs an alarm state of the NE 110 itself to the operation system 100 in response to an access from the operation system 100.

  Note that the NE 110 notifies the operation system 100 of an alarm when the NE 110's own alarm state is switched. That is, when a certain NE 110 continues to operate normally, the alarm state remains “normal state”, and thus no alarm is notified. In addition, when a state where the processing of a certain NE 110 is not normally performed continues, the alarm state remains “abnormal state”, and thus an alarm is not notified even in this case. On the other hand, in a certain NE 110, when the state where processing is normally performed and the state where processing is not performed normally are switched, the processing state of the NE 110 is unstable, so the NE 110 notifies the operation system 100 of an alarm. .

Hereinafter, each part of the operation system 100 will be described.
(Interface part)
The interface unit 10 has a function as a communication unit that performs communication with the NE 110. The interface unit 10 includes a receiving unit 11 that receives an alarm or the like from the NE 110, a transmitting unit 12 that transmits a control signal or the like to the NE 110, and an alarm received from the NE 110 that is an alarm notification source NE (A) 110a to NE. (E) An alarm distribution processing unit 13 that performs classification and distribution for each 110e is provided.

(Alarm receiver)
The alarm receiving unit 20 includes alarm receiving units A20a to E20e provided corresponding to the NE (A) 110a to NE (E) 110e, and the NE (A) 110a to 110 ( The alarm distributed to each NE (E) 110e is received. The alarm received by the alarm receiving unit 20 stays in the alarm receiving unit 20 until processing corresponding to the alarm is performed.

In the operation system 100, it is necessary to maintain consistency in processing order between the alarm notified from each NE 110 and the control in the operation system 100 for the alarm. For this reason, the consistency of the processing order is maintained by providing the alarm receivers A20a to E20e provided corresponding to the NE (A) 110a to NE (E) 110e, respectively.
Note that the alarm receiving unit retains the number of alarms staying in the alarm receiving unit 20 in the network state management unit 30 and staying in the alarm receiving unit 20 when the alarm notification from all the NEs 110 described later is controlled. The alarm to be discarded is discarded.

(Network Status Management Department)
The network state management unit 30 includes a network state management unit A30a to a network state management unit E30e provided corresponding to each of the alarm reception unit A20a to the alarm reception unit E20e. Each of the network state management units 30 includes the number of alarms received by the corresponding alarm reception unit 20 or the number of alarms staying in the alarm reception unit 20 among the alarms received by the corresponding alarm reception unit 20 (hereinafter referred to as the number of staying alarms). The number of alarm state changes of the corresponding NE 110 (the number of alarm state changes will be described later) is managed. In each network state management unit 30, the number of alarms, the number of staying alarms, the number of alarm state changes, and the like are managed by, for example, a list.

  The network state management unit 30 is provided for the alarm receiving unit A20a to the alarm receiving unit E20e, and the number of alarms received by each of the alarm receiving unit A20a to the alarm receiving unit E20e or the number of staying alarms in the alarm receiving unit 20 Alternatively, the number of alarm state changes of all NEs 110 may be collectively managed. In this case, the network state management unit 30 manages the number of alarms, the number of staying alarms, or the number of alarm state changes, for example, using a database or the like. As for the number of alarms, the number of staying alarms, the number of alarm state changes, etc., the value acquired last time is managed by the network state management unit 30 until the value acquired this time is notified to the network state management unit 30.

(Congestion state determination unit)
The congestion state determination unit 40 has a function of determining the congestion state of the operation system 100 based on an alarm notified from the NE 110. The congestion state determination unit 40 determines the congestion state of the operation system 100 based on the number of alarms and the number of staying alarms managed by the network state management unit A30a to the network state management unit 30e.

  The congestion state determination unit 40 monitors the number of alarms that remain in the alarm reception unit 20 among the alarms that are managed by the network state management unit 30 and that are notified from all the NEs 110. If it is detected that the value exceeds (the first threshold), it is determined that there is a congestion state. In this case, the threshold value (first threshold value) is, for example, the number of alarms that can be processed in the operation system 100 for a fixed time (the total number of processes that can be performed). The fixed time is a unit time that can be arbitrarily set.

  The congestion state determination unit 40 determines that the total number of alarms staying in the alarm reception unit A20a to the alarm reception unit E20e managed by the network state management unit 30 has exceeded a threshold value for a certain period of time, and receives an alarm. If at least one of the number of alarms staying in any of the part A20a to the alarm receiving part E20e exceeds the threshold value in units of the alarm receiving part is determined, it is determined as being in a congestion state. In this case, the threshold is, for example, the number of alarms that can be processed in the operation system 100 in a certain time (the total number of processes that can be performed). The threshold value in units of alarm receivers is, for example, the number of alarms (number of alarms that can be processed in units) that can be processed by each of the alarm receivers A20a to E20e (in units of alarm receivers).

(Alarm status acquisition unit)
As shown in FIG. 2, when the operation state 100 is determined to be in the congestion state by the congestion state determination unit 40, the alarm state acquisition unit 50 replaces the reception of the alarm notification from the NE 110 with respect to the NE 110. It has a function to access and acquire the alarm status of NE100. Note that the NE 110 is accessed via the transmission unit 12 of the interface unit 10.

  Acquisition of the alarm state of the NE 100 is performed in a state in which alarm notification suppression control from all the NEs 110 is performed by an alarm notification suppression / cancellation unit 70 described later. If the alarm notification suppression / cancellation unit 70 controls the suppression of alarm notifications from all the NEs 110, the operation system 100 side cannot know the state of the NEs 110 without confirming the state of the NEs 110 itself. For this reason, the alarm state acquisition unit 50 accesses the NE 110 in a state where the alarm notification suppression control from all the NEs 110 is performed, and displays an alarm state indicating whether each NE 110 is in a normal state or an abnormal state. get. The alarm state acquisition unit 50 periodically acquires an alarm state for the NE 110.

For example, for the NE (A) 110a, the alarm state acquisition unit 50 compares the alarm state acquired at the previous access with the alarm state acquired at the current access, and the alarm state is changed from the normal state to the abnormal state or the abnormal state. When the state changes from normal to normal, the alarm state change count is set to “1”. When there is no change in the alarm state, the number of alarm state changes is set to “0”.
The alarm state comparison is performed for each function of the NE 110. FIG. 5A shows the alarm state of the NE 110 at the time of previous acquisition, and FIG. 5B shows the alarm state of the NE 110 at the time of acquisition this time. In FIG. 5A and FIG. 5B, the functions shown in white are functions in the “normal state”, and the functions shown in diagonal lines are functions in the “abnormal state”.

  As shown in FIG. 5A, in the NE 110 having the six functions A to F, the alarm state acquired last time is that the functions A to E are “normal state” and only the function F is “abnormal state”. Suppose that Next, as shown in FIG. 5B, the alarm state acquired this time is that the function A, the function C, the function E and the function F are “normal state”, and the function B and the function D are “abnormal state”. Suppose there was. In this case, the alarm states of the function B, the function D, and the function F are changed between the previous time and the current time. In this case, the number of alarm state changes is counted for each function. Therefore, the alarm state acquisition unit 50 acquires the alarm state change number “3” for one NE 110.

  As the number of alarm state changes increases, more alarms from the NE 110 are predicted to be notified. The number of alarm state changes basically coincides with the number of alarms received by the operation system 100 from the NE 110, and other factors (for example, conditions in which an alarm is not notified even if the alarm state changes in a specific case) In some cases, the number of alarm state changes exceeds the number of alarms actually notified.

The alarm state acquired by the alarm state acquisition unit 50 and the number of alarm state changes obtained from the alarm state are managed by the network state management unit 30 corresponding to each NE 110. Moreover, the alarm state acquired by the alarm state acquisition unit 50 this time is also managed by the network state management unit 30 corresponding to each NE 110, and the alarm state acquired last time from the network state management unit 30 is also managed. Acquire and compare with the alarm status acquired this time.
Are managed by the network state management unit A30a to the network state management unit 30e corresponding to each of the NE (A) 110a to NE (E) 110e.
The acquisition of the alarm state of the NE 100 is preferably performed for all NEs 110. The alarm state acquisition cycle for all NEs 100 varies depending on the number of accommodated NEs, and is about several minutes to one hour.

(Congestion control release determination unit)
The congestion control cancellation determination unit 60 has a function of determining whether or not to cancel the congestion control based on the alarm state acquired from the NE 110.
The congestion control cancellation determination unit 60 acquires the alarm state of each NE 110 acquired by the alarm state acquisition unit 50 accessing all the NEs 110 in order from each of the network state management units 30. The congestion control cancellation determination unit 60 determines whether the NE 110 is in a first congestion cancellation enabled state based on the acquired number of alarm state changes (first congestion cancellation determination). In the first congestion release determination, it is determined whether or not the acquired NE110 alarm state change count is below a predetermined threshold (second threshold). Examples of the predetermined threshold (second threshold) include a value that is slightly smaller than the total number of processes that can be performed in the operation system 100.

In addition, the congestion control release determination unit 60, after entering the first congestion release enabled state, from the network state management unit 30 to some of the NEs 110 (for example, NE (A) 110a and NE (B) 110b, Hereinafter, based on the number of alarms of a specific NE (referred to as appropriate), it is determined whether or not other NEs (for example, NE (C) 110c to NE (E) 110e) are in a congestion release enabled state (second Congestion release determination). In the second congestion release determination, it is determined whether or not the number of alarms notified from the specific NE that has canceled the alarm notification suppression is below a predetermined threshold (third threshold). The predetermined threshold value (third threshold value) includes a value that is slightly less than the number of unit processable alarms that can be processed by each of the alarm receivers A20a to E20e (in units of alarm receivers). If it is determined that the other network element is in a congestion release enabled state, the other NEs (for example, NE (C) 110c to NE (E) 110e) also shift to congestion release.
The function of the congestion control cancellation determination unit 60 will be described later.

(Alarm Notification Suppression / Release Department)
The alarm notification suppression / cancellation unit 70 has a function of requesting the NE 110 to cancel the alarm notification suppression control or the alarm notification suppression control based on the determination of the congestion state determination unit 40 and the congestion control cancellation determination unit 60. . Note that the NE 110 is accessed via the transmission unit 12 of the interface unit 10.
When the congestion state determination unit 40 determines that the operation system 100 is in a congestion state, the alarm notification suppression / cancellation unit 70 requests suppression of alarm notifications from all NEs 110. As a result, the operation system 100 does not receive an alarm from the NE 110.

  In addition, the warning notification suppression / cancellation unit 70 determines that a part of the NEs 110 (for example, NE) after the congestion control cancellation determination unit 60 determines that the first congestion cancellation is possible in the first congestion cancellation determination. (A) 110a and NE (B) 110b) are requested to cancel the suppression of alarm notification to specific NEs. Then, when it is determined that the remaining NEs (NE (C) 110c to NE (E) 110e) are in a state in which congestion can be released, the remaining NEs (NE (C) 110c to NE (E) 110e are also displayed. ) Is requested to cancel the alarm notification suppression.

(Control part)
The control unit 80 is an operation system such as the interface unit 10, the alarm receiving unit 20, the network state management unit 30, the congestion state determination unit 40, the alarm state acquisition unit 50, the congestion control release determination unit 60, and the alarm notification suppression / release unit 70. The operation of each part constituting 100 is controlled.

(Other)
The operation system 100 may include a display unit that displays the congestion control state, the state of each NE, and the like, and an input unit (not shown) through which an operator inputs an instruction. The operation system 100 may be connected to another operation device (not shown) provided with a display unit, an input unit, and the like.

2. Operation of Operation System Hereinafter, the operation system of the present invention will be described. In the following description, after detecting that the operation system 100 is in a congested state, the alarm notifications from all the NEs 110 are suppressed, the alarm states of all the NEs 110 are sequentially acquired, and the number of alarm states is acquired. A case where the congestion release determination is performed will be described.

FIG. 6 is a sequence chart showing the operation in the operation system 100 of the present invention.
In step S <b> 101, each NE 110 notifies the alarm receiver 20 of an alarm. In step S102, the alarm is distributed and received by the alarm receiver 20 provided corresponding to each of the NEs 110. In step S <b> 103, each of the alarm receivers 20 that have received the alarm notifies the network state management unit 30 of the number of alarms remaining in the alarm receiver 20. In step S104, the network state management unit 30 receives and holds the number of alarms staying in the alarm reception unit 20. The number of alarms staying in the alarm reception unit 20 is the network status management unit 30 (network status management unit) provided corresponding to each notification source NE 110 (for example, NE (A) 110a to NE (E) 110e). A30a to network state management unit E30e). Further, the number of alarms staying in the alarm receiving unit 20 may be collectively managed by the network state management unit 30.

  In step S105, the congestion state determination unit 40 periodically monitors the network state management unit 30, and in the alarm reception unit 20 among alarms notified from the NE 110 in step S106, specifically, alarms notified from the NE 110. The number of alarms staying at is received. In step S107, the number of staying alarms received is compared with a threshold value (first threshold value). If the number of staying alarms exceeds the threshold value, it is determined that the operation system 100 is in a congestion state, and the process proceeds to step S108. If the number of staying alarms does not exceed the threshold value, it is determined that the operation system 100 is not in a congestion state, the process returns to step S105, and steps S105 to S107 are repeated. The comparison between the number of staying alarms and the threshold value determines whether or not the number of staying alarms exceeds the threshold value for a certain period of time. The “certain time” is a time that can be arbitrarily set, and is preferably set to about 10 to 60 seconds, for example. The shorter the “certain time” is set, the higher the sensitivity of congestion detection.

If the congestion state determination unit 40 determines that the operation system 100 is in the congestion state, in step S108, the alarm notification suppression / release unit 70 requests an alarm notification suppression instruction for all NEs 110. In step S109, the alarm notification suppression / cancellation unit 70 transmits an alarm notification suppression instruction to all NEs 110.
In step S <b> 110, all NEs 110 suppress alarm notification to the operation system 100 based on the alarm notification suppression instruction from the alarm notification suppression / release unit 70. In step S111, all NEs 110 transmit a response to the effect that the alarm notification has been suppressed to the congestion state determination unit 40.

  In step S <b> 112, the congestion state determination unit 40 requests the alarm reception unit 20 to discard the stay alarm in the alarm reception unit 20. In step S113, the alarm receiving unit 20 that has received the stay alarm discard request from the congestion state determination unit 40 discards the stay alarm. Thereafter, in step S114, the congestion state determination unit 40 transmits a notification that the state has shifted to the congestion control state to the alarm state acquisition unit 50 and the congestion control release determination unit 60. The congestion control state transition notification transmitted to the alarm state acquisition unit 50 also serves as an NE 110 alarm state acquisition request instruction. The congestion control state transition notification transmitted to the congestion control release determination unit 60 also serves as an instruction to monitor the NE 110 alarm state change count to the network state management unit 30.

  In step S115, the alarm state acquisition unit 50 makes an alarm state acquisition request (first time) to the NE 110. Note that the alarm status acquisition request is sequentially made to all NEs 110, for example. In step S116, when the alarm state acquisition unit 50 receives the alarm state of each NE 110, the alarm state of the NE 110 received this time is held by itself until the next alarm state is received. At this time, since the alarm state is acquired for the first time, there is no previous acquisition alarm state. For this reason, the number of alarm state changes is not acquired.

  Subsequently, in step S117, the alarm state acquisition unit 50 makes an alarm state acquisition request (second and subsequent times) to the NE 110. In step S118, the alarm state acquisition unit 50 receives the alarm state of each NE 110. Subsequently, in step S119, the alarm status of each NE 110 acquired this time is compared with the alarm status of the NE 110 acquired last time that the NE 110 holds, and if there is a change in the alarm status, the number of alarm status changes is calculated. To account. Note that the number of alarm state changes is compared for each function included in each NE 110, and when there are changes in the alarm state in a plurality of functions, two or more alarm state change numbers may be obtained from one NE 110. The alarm state acquisition unit 50 holds the alarm state of each NE 110 received this time by itself until the reception of the next alarm state after acquiring the number of alarm state changes. In step S <b> 120, the alarm state acquisition unit 50 transmits the acquired number of alarm state changes to the network state management unit 30. In step S121, the network state management unit 30 receives and holds the alarm state change count of each NE 110.

  Subsequently, in step S122, the congestion control cancellation determination unit 60 periodically monitors the network state management unit 30, and in step S123, the number of alarm state changes of all NEs 110 periodically managed by the network state management unit 30. To get. In step S124, the obtained alarm state change number is compared with a threshold (second threshold) (first congestion release determination). When the number of alarm state changes is less than the threshold value, it is determined that the operation system 100 is in the first congestion release enabled state, and the process proceeds to step S125. If the number of alarm state changes does not fall below the threshold, it is determined that the operation system 100 is not in the first congestion release enabled state, the process returns to step S117, and steps S117 to S124 are repeated. In the comparison between the alarm state change number and the threshold value, it is determined whether or not the alarm state change number exceeds the threshold value for a predetermined time. The “certain time” is a time that can be arbitrarily set, and is preferably set to, for example, about several minutes to one hour. Further, the comparison between the alarm state change number and the threshold value may be performed in response to acquisition of the alarm state cycle. In this case, the “certain time” may be set according to the number of NEs 110 to be accommodated.

  If the congestion control release determination unit 60 determines that the operation system 100 is in the first congestion release enabled state, a part of all the NEs 110 is sent to the alarm notification suppression / release unit 70 in step S125. Requests a warning notification suppression release instruction for a specific NE that is the current NE. In step S126, the alarm notification suppression / cancellation unit 70 transmits an alarm notification suppression cancellation instruction to the specific NE. For example, the specific NE may select NEs in order from the smallest number of alarm state changes, and may select a plurality of NEs selected in a range where the total number of alarm state changes is equal to or less than a predetermined threshold.

  FIGS. 7A and 7B are diagrams for explaining a specific example of the above-described specific NE selection method. As shown in FIGS. 7A and 7B, when the number of alarm state changes is managed by the network state management unit 30 using a table, rearrangement is performed in ascending order based on the number of alarm state changes. In the example of FIG. 7A, NE (A) 110a (alarm state change number 100), NE (B) 110b (alarm state change number 150), NE (C) 110c (alarm state change number 20), NE ( D) shows a table in which 110d (alarm state change number 50) and NE (E) 110e (alarm state change number 400) are arranged in order. FIG. 7B is a table in which rearrangement is performed so that the alarm state change numbers are in ascending order. In the table of FIG. 7B, when the NE is selected in a range where the total value when the number of alarm status changes of the higher order NE is totaled is less than a predetermined threshold (fourth threshold, for example, 200). , NE (A), NE (C), and NE (D) are specific NEs. In addition, the other selection method of specific NE is mentioned later.

  When the specific NE receives the alarm notification suppression cancellation instruction from the alarm notification suppression / cancellation unit 70, the specific NE cancels the suppression of the alarm notification in step S127. In step S128, the specific NE notifies the alarm receiver 20 of an alarm. In step S129, the alarm is distributed and received by the alarm receiver 20 provided corresponding to the specific NE. In step S <b> 130, the alarm receiving unit 20 that has received the alarm notifies the network state management unit 30 of the number of alarms remaining in the alarm receiving unit 20. In step S131, the network state management unit 30 receives and holds the number of alarms staying in the alarm reception unit 20.

  In step S132, the congestion control release determination unit 60 periodically monitors the network state management unit 30, and receives an alarm from among alarms notified from the specific NE in step S133, specifically among alarms notified from the specific NE. The number of alarms staying in the unit 20 is received. In step S134, the received number of staying alarms is compared with a threshold (third threshold) (second congestion release determination). If the number of staying alarms is below the threshold value, it is determined that the congestion state of the entire operation system 100 has been released, and the process proceeds to step S135. If the number of staying alarms does not fall below the threshold value, it is determined that the operation system 100 is still in a congestion state, the process returns to step S132, and steps S132 to S134 are repeated.

When the congestion control cancellation determination unit 60 determines in the second congestion cancellation determination that the congestion control cancellation determination unit 60 is in the second congestion cancellation state, it is assumed that the congestion state of the entire operation system 100 has been canceled. For this reason, in step S135, the alarm notification suppression / cancellation unit 70 is requested to issue an alarm notification suppression instruction to all NEs 110 (or the remaining NEs of all NEs 110 excluding specific NEs, the same applies hereinafter). In step S <b> 136, the alarm notification suppression / cancellation unit 70 transmits an alarm notification suppression instruction to all NEs 110.
When all the NEs 110 receive the warning notification suppression release instruction from the warning notification suppression / cancellation unit 70, the NE 110 cancels the suppression of the alarm notification in step S137. Accordingly, the monitoring team of the operation system 100 returns to the normal state, and the alarm receiving unit 20 receives the alarm notified from the NE 110 by returning to step S101.

(Selection of specific NE)
The specific NE is selected based on the following criteria, for example.
(I) NEs with a large number of alarm state changes are selected In this case, the number of alarms of the selected NE can be determined because it is possible to determine the actual number of alarms for NEs that are considered to have a relatively large number of alarms after congestion release. Can be determined that the number of warnings of other NEs is also stable. That is, if the operation system 100 does not fall into a congestion state again after canceling the alarm notification suppression of the selected NE, it can be determined that the congestion state of the entire operation system 100 has been released. For this reason, it is possible to prevent the operation system from entering the congestion state again after the congestion control is canceled. At this time, only the NE with the highest number of alarm state changes may be selected, or a plurality of NEs higher than the NE with the highest number of alarm state changes may be selected.

(Ii) Selection of NE with Low Number of Alarm State Changes In this case, the actual number of alarms can be determined for NEs that are considered to have a relatively small number of alarms after the congestion release. For this reason, when the actual number of alarms of the selected NE is small, by repeating the process of canceling the alarm notification suppression, only NEs that are highly likely to cause congestion continue to suppress alarm notification. Thus, it is possible to focus on monitoring the NE. At this time, only the NE with the smallest number of alarm state changes may be selected. Further, NEs may be selected in order from the smallest number of alarm state changes, and a plurality of NEs selected in a range where the total number of alarm state changes is equal to or less than a predetermined threshold may be selected (specification exemplified in step S126). NE selection method). In this case, it is highly possible to acquire alarms that are equal to or less than the number of alarms that can be reliably processed in advance, and focus on monitoring NEs that are likely to cause congestion without falling into a congestion state again. it can. The predetermined threshold includes the number of alarms that can be processed by the entire operation system.

(Iii) Select NE with a large number of staying queues when it is determined that the congestion state is present. In this case, since the actual number of NE alarms with a high possibility of congestion can be determined, an alarm for the selected NE is selected. If the number is stable, it can be determined that the number of alarms of other NEs is also stable. For this reason, it is possible to prevent the operation system from entering the congestion state again after the congestion control is canceled.

(Iv) Select NE with the number of staying queues exceeding the threshold when judged to be in a congestion state In this case, as in (iii), determine the actual number of NE alarms that are likely to cause congestion. Therefore, the operation system can be prevented from falling into a congestion state again after the congestion control is canceled.

(V) Select an NE with a small number of staying queues when it is determined that the congestion state is present. In this case, since the actual number of NE alarms with a low possibility of congestion can be determined, the number of alarms is stable. It is possible to cancel the alarm notification suppression at an early stage with respect to the NE. For this reason, when the actual number of alarms of the selected NE is small, by repeating the process of canceling the alarm notification suppression, only NEs that are highly likely to cause congestion continue to suppress alarm notification. Thus, it is possible to focus on monitoring the NE.

(Vi) Selection from NEs arranged at a position on the network close to the mobile terminal Since NEs arranged at a position close to the mobile terminal on the network close to the mobile terminal have few mobile terminals corresponding to the NE, There is a case where it is difficult to fall into a congestion state and the number of alarms is small, that is, the possibility of congestion is low. For this reason, by repeating the process of canceling the alarm notification suppression in order from the NE that is considered to have a low possibility of congestion, only the NE that has a high possibility of causing the congestion continues to suppress the alarm notification. Can focus on monitoring.

(Vii) Selection from NE arranged at a position far from a mobile terminal on the network Contrary to (vi), NE arranged at a position far from the mobile terminal on the network is a mobile terminal corresponding to the NE. It is thought that it is likely to fall into a relatively congested state. For this reason, by confirming the actual number of alarms first from the NE that is considered to be likely to cause congestion, if the number of alarms of the selected NE is stable, the number of alarms of other NEs is also stable. It is possible to prevent the operation system from falling into a congestion state again after the congestion control is canceled.
(Viii) Select one station for each type of NE In this case, since the actual number of alarms can be confirmed for each NE having different properties, which type of NE has the cause of congestion. Judgment can be made.

(Ix) Selection for each type of NE If it is known which type of NE has the cause of congestion, select the type of NE that seems to have the cause of congestion and determine whether the number of alarms is stable. can do. Therefore, if the number of alarms of the selected NE is stable, it can be determined that the number of alarms of other NEs is also stable, and the operation system is prevented from falling into a congestion state again after the congestion control is released. be able to.

In addition, when a type of NE that seems to have no congestion cause is selected, it is possible to cause congestion by repeating the process of canceling alarm notification suppression in order from the NE that is considered to be less likely to be the cause of congestion. Only highly NEs can continue to suppress alarm notifications and focus on monitoring the NE.
For example, after detecting the NE causing the congestion from the NE selected by the selection criterion (viii), the NE may be selected by the selection criterion (ix) and the congestion release determination may be performed.

  Among the above NE selection criteria, (i) to (v) are criteria for selecting a target NE based on the number of staying queues or the number of alarm state changes actually detected in the operation system. Among the above-mentioned NE selection criteria, (vi) to (ix) are criteria for selecting a target NE based on the nature of the NE, such as the installation position on the network and the NE type. These selection criteria may be used not only alone but also in combination. For example, when using selection criteria (viii) (select one station for each NE type), by further combining selection criteria (i) (select NEs with a large number of alarm state changes) It is possible to select the one with the largest number of state closing changes.

Further, when a rough cause of congestion is known, at least one of the above selection criteria may be automatically selected according to the cause.
In one embodiment of the present invention, the threshold value for determining the congestion state and the release of the congestion state is used. However, the threshold value used as a criterion for determining the normal state to the congestion state, and the release of the congestion state from the congestion state. The threshold value that is the determination criterion for (normal state) may be the same value or a different value. When setting a threshold value that is a criterion for releasing a congestion state to be smaller than a threshold value that is a criterion for determining a congestion state, the threshold value that is a criterion for releasing a congestion state is set with a margin from the processing limit of the operation system. Is done. For this reason, it is preferable in that it is difficult to fall into the congestion state again after the congestion state is released.

(Effect of this embodiment)
As described above, the present invention is also effective in a state in which repeated alarms frequently occur for a long time from many NEs. By managing and controlling the NE by the operation system of the present invention, it is possible to prevent the congestion state from being appropriately released and falling into the congestion state immediately after the operation system is restored. Further, for example, it is possible to prevent the occurrence of an event that makes it difficult to grasp a failure state based on a processing delay due to overload or a missing alarm from a NE during a large-scale disaster.

  Further, according to the present invention, the congestion control release determination is made in two stages, the state of the entire accommodated NE is predicted in the first stage, and the congestion state is determined from the actual number of alarms acquired from the specific NE in the second stage. . As a result, since the congestion control of each NE is released after the state of a large number of NEs to be accommodated is stabilized, a large number of alarms are notified from the NE that has released the congestion control, and the operation system falls into a congestion state again. Can be suppressed.

  Further, the present invention suppresses all alarm notifications not only from the problem NE but also from the accommodation NE in the operation system when the operation system falls into a congestion state. As a result, there is a large number of operation systems that are idle during normal operation, which occurs when only alarm notifications from problematic NEs are suppressed in “a state where almost all NEs in one operation system are congested for a long time”. Therefore, it is possible to solve the problems that the operation system performance cannot be effectively utilized and that “the NE is easily congested and the monitoring quality for the NE is degraded”.

  Here, it is also possible to manage the congestion state by adding an operation system using a conventional alarm monitoring method and improving the processing capacity. On the other hand, according to the present invention (the invention according to the present embodiment), it is not necessary to add hardware even if the assumed congestion scale increases. For this reason, even when designing the equipment of the operation system in consideration of the case where a large number of alarms occur for a long time from many NEs, it is preferable in that the equipment capacity is small compared to the case where the conventional alarm monitoring method is used. That is, the operation system of the present invention can effectively perform congestion control with conventional equipment even when large-scale congestion occurs. Accordingly, it is possible to suppress an increase in costs related to system introduction, system maintenance and management, etc., and to reduce maintenance labor due to a small equipment capacity. In addition, it is possible to efficiently design hardware between alarm monitoring when many NEs generate alarms over a long period of time and normal alarm monitoring.

  The scope of the present invention is not limited to the illustrated and described exemplary embodiments, but also includes all embodiments that provide equivalent effects to those intended by the present invention. Further, the scope of the invention is not limited to the combinations of features of the invention defined by the claims, but can be defined by any desired combination of specific features among all the disclosed features.

DESCRIPTION OF SYMBOLS 100 ... Operation system 10 ... Interface part 11 ... Reception part 12 ... Transmission part 13 ... Alarm distribution processing part 20 ... Alarm reception part 30 ... Network state management part 40 ... Congestion state determination unit 50 ... alarm state acquisition unit 60 ... congestion control cancellation determination unit 70 ... alarm notification suppression / cancellation unit 80 ... control unit 110 ... network element

Claims (11)

In an operation system for managing a plurality of network elements constituting a communication network,
A congestion state determination unit that determines a congestion state of the operation system based on the number of alarms notified from the network element;
When the congestion state determination unit determines that the operation system is in a congestion state, instead of receiving an alarm notification from the network element, the plurality of network elements are accessed, An alarm state acquisition unit that acquires an alarm state indicating whether each of the network elements is in a normal state or an abnormal state; and
The alarm status of the network element acquired from the plurality of network elements by the alarm status acquisition unit is compared with the alarm status of the network element acquired by the alarm status acquisition unit last time. The number of alarm state changes of the plurality of network elements counted when the state or abnormal state changes to the normal state is acquired, and the plurality of network elements can release the first congestion based on the number of alarm state changes A first congestion release determination for determining whether or not the network element is in a state, and an alarm notification among a plurality of the network elements after it is determined in the first congestion release determination that the first congestion release is possible An alert is received from some network elements that have been de-suppressed, and notification is sent from some network elements. On the basis of the number of alarms, the congestion control cancel determination unit which performs the second and congestion cancel determination determines the whether the other of said network elements in a congestion releasable state,
Based on the determination of the congestion state determination unit and the congestion control release determination unit, an alarm notification suppression / release unit that requests the network element to suppress alarm notification or to cancel alarm notification suppression, and
An operation system comprising: An alarm receiving unit for receiving the alarm notified from the network element;
When the congestion state determination unit detects that the number of alarms staying in the alarm reception unit exceeds a first threshold for a predetermined time, it is determined that the congestion state is a congestion state. The operation system according to claim 1. The alarm notified from the network element comprises a plurality of the alarm receiving units that are classified and received for each network element,
In the congestion state determination unit, the total number of alarms that can be processed in the entire operation system and the number of alarms that can be processed in each of the alarm reception units provided for each network element are set,
The congestion state determination unit,
The total number of alarms staying in the alarm receiving unit exceeds the total processable alarm number, and the number of alarms staying in one of the alarm receiving units exceeds the unit processable alarm number. 3. The operation system according to claim 2, wherein when at least one of the two is detected, the congestion state is determined. The congestion control release determination unit
The plurality of network elements are determined to be in a first congestion release enabled state when the alarm state change count of the plurality of acquired network elements is equal to or less than a second threshold value. The operation system according to any one of claims 1 to 3. The congestion control release determination unit
2. When the number of alarms received from the part of network elements whose alarm notification suppression is canceled is equal to or less than a third threshold value, it is determined to shift to congestion cancellation of the other network elements. The operation system according to any one of claims 4 to 5.   The one or more network elements that perform release of alarm notification suppression are selected based on at least one of the number of network element status changes and the number of stay alarms immediately before alarm notification suppression. 6. The operation system according to any one of 5 above.   The operation system according to claim 6, further comprising a network element state management unit that manages at least one of the number of alarm state changes for each network element and the number of staying alarms immediately before alarm notification suppression.   The congestion control release determination unit is selected based on the number of alarm state changes for each network element managed by the network element state management unit in a range where the total number of alarm state changes is equal to or less than a fourth threshold value. The operation system according to claim 7, wherein the at least one network element that has been set is the part of the network element that performs cancellation of alarm notification suppression.   The said some network element which performs alarm notification suppression cancellation is selected based on the arrangement | positioning position of the network element with respect to the kind of network element and a mobile terminal, The any one of Claims 1-5 characterized by the above-mentioned. The operation system described in the section. In an alarm monitoring method in an operation system that monitors alarms from a plurality of network elements constituting a communication network,
Based on the number of alarms notified from the network element, determine the congestion state of the operation system,
If it is determined that the state is congested, the network element is requested to suppress the alarm notification, and instead of receiving the alarm notification from the network element, the plurality of network elements are accessed. Obtaining an alarm state indicating whether each of the plurality of network elements is in a normal state or an abnormal state;
When the alarm state of the network element acquired from a plurality of the network elements is compared with the alarm state of the network element acquired last time, and the alarm state changes from a normal state to an abnormal state or from an abnormal state to a normal state First, the number of alarm state changes of the plurality of network elements to be counted is obtained, and based on the number of alarm state changes, a first determination is made as to whether or not the plurality of network elements are in a first decongestable state Perform congestion release judgment,
When it is determined in the first congestion cancellation determination that the first congestion cancellation determination state is present, a request to cancel the suppression of alarm notification is issued to a part of the plurality of network elements,
An alarm is received from a part of the network elements of which the alarm notification suppression is canceled among the plurality of network elements, and based on the number of the alarms notified from the part of the network elements, the other network elements A second congestion release determination is performed to determine whether or not the congestion release is possible.
When it is determined in the second congestion release determination that the congestion of the network element is to be canceled, the network element that is suppressing the alarm notification is requested to cancel the suppression of the alarm notification. Monitoring method. In a program for causing an operation system computer to execute an alarm monitoring method for monitoring an alarm from a plurality of network elements constituting a communication network,
A process of determining a congestion state of the operation system based on the number of alarms notified from the network element;
If it is determined that the state is congested, the network element is requested to suppress the alarm notification, and instead of receiving the alarm notification from the network element, the plurality of network elements are accessed. A process of obtaining an alarm state indicating a state of each of the plurality of network elements being in a normal state or an abnormal state;
When the alarm state of the network element acquired from a plurality of the network elements is compared with the alarm state of the network element acquired last time, and the alarm state changes from a normal state to an abnormal state or from an abnormal state to a normal state First, the number of alarm state changes of the plurality of network elements to be counted is obtained, and based on the number of alarm state changes, a first determination is made as to whether or not the plurality of network elements are in a first decongestable state A process for determining congestion release;
When it is determined in the first congestion cancellation determination that the state is in the first congestion cancellation determination state, a process for requesting cancellation cancellation of alarm notification to a part of the plurality of network elements;
An alarm is received from a part of the network elements of which the alarm notification suppression is canceled among the plurality of network elements, and based on the number of the alarms notified from the part of the network elements, the other network elements A process of performing a second congestion release determination for determining whether or not the congestion release is possible;
A process for requesting the network element that is suppressing the alarm notification to cancel the alarm notification suppression when it is determined in the second congestion cancellation determination that the congestion of the network element is to be canceled. A program for causing an operation system computer to execute a characteristic alarm monitoring method.

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