JPH10243095A - Traffic load distribution control system for multi-processor control exchange - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the traffic load distribution control system for an exchange the conducts call connection processing by a plurality of call control processors where a traffic load exerted to each call control processor is uniformly distributed to improve the processing efficiency. SOLUTION: Each of a plurality of call control processors 3 is provided with a function that monitors periodically a load state of its own processor and an outgoing line resource and reports the monitors result to a load distribution processor. The load distribution processor 2 receiving integrated call signals grasps the load state of each call control processor 3 and distributes the received call signals so as to uniformize the load of each call control processor 3. In the case that the load state of all the call control processors 3 reaches a prescribed value or over, call transmission restriction is raised.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traffic load distribution control method for a multiprocessor control exchange in which a plurality of call control processors perform call switching control. The present invention relates to a traffic load distribution control method for a multiprocessor control exchange that distributes call control requests according to load conditions and equalizes the load on each call control processor.

[0002]

2. Description of the Related Art An exchange plans a facility in consideration of a certain rate of change in the number of calls, but when a call connection request exceeding the facility plan is suddenly added, a congestion state occurs. It is known that if the congestion state continues, the exchange greatly reduces the processing capacity it originally has, and in order to avoid this, it maintains the processing capacity it originally has by using traffic regulation control. doing. In a multiprocessor control switch that performs switching processing while balancing the load among multiple call control processors, it is important to distribute the load on each call control processor evenly before the traffic congestion state that triggers traffic regulation. It has become.

As a technique for equalizing the load of a call control processor in a multiprocessor control exchange, for example,
There is a technique disclosed in Japanese Patent Application Laid-Open No. 4-128959. According to this technique, first, when a call is received at an input / output unit, a processing request is broadcast to a plurality of call control processors. Each call control processor receiving this processing request sends a response to the request to the input / output unit according to its own load condition. The input / output unit selects the first response received,
A request is made to the processor that issued the response for processing.

The technique disclosed in Japanese Patent Application Laid-Open No. 5-252551 also relates to load equalization of a plurality of call control processors. This technology is used in a multiprocessor control switching system consisting of multiple call path networks and a processor that individually controls them, and interconnects multiple call path networks with loopback call paths within the own network using a call junk. doing. When a call is made to a network controlled by a processor with a high load, the processor selects a communication path network controlled by the processor with the lowest usage rate, and returns to that network via a loopback communication path and a communication junctor. Connecting. The load is equalized by transferring the subsequent call control right to the call control processor of the selected network.

[0005]

However, the above-mentioned prior art has the following problems.

In the technique disclosed in Japanese Patent Application Laid-Open No. 4-128959, a process request is issued to a plurality of call control processors by broadcast communication. The call control processor must perform a process of answering or not answering, and this process is all invalid. Therefore, the load is equalized, but the processing capacity is reduced.

In the technique disclosed in Japanese Patent Application Laid-Open No. H5-252551, a path resource of a network that bypasses to another communication path network when the usage rate is not balanced, for example, a return communication path or a general communication path, The resource is used for this detour, and the resources cannot be used efficiently. Further, if the network return communication path under the control of the processor with a high load is used up, a call request of the processor to the network cannot be bypassed to another processor having a margin, and the call is disconnected. Further, the processing load required for the detour processing cannot be ignored.

The present invention solves the above-mentioned problems of the prior art, which improves the processing efficiency, distributes the traffic so that the switching device resources can be used most effectively, and has the processing capability. It is an object of the present invention to provide a traffic load distribution control method for judging a congestion state and performing traffic regulation control just before reaching a limit point or when available switching device resources are exhausted.

[0009]

According to the traffic load distribution control method of the multiprocessor control exchange of the present invention, a plurality of call control processors for controlling a call connection and a plurality of lines from a preceding device are connected and accommodated. A signal control device for receiving a call connection control signal including a call signal transmitted from the device,
It is characterized by including a load distribution processor that determines which of the plurality of call control processors is to be used in accordance with a call connection request from the preceding device according to the load state of each call control processor.

Each call control processor has means for periodically monitoring the usage rate of its own processor and the idle / busy state of the outgoing line managed by its own processor, and outputting the monitoring result information to the load distribution processor.

The load distribution processor is connected to the signal control device and each call control processor, and receives a call signal from the signal control device, and based on monitoring result information output from the plurality of call control processors, loads the plurality of call control processors. And a means for transferring a call signal to the selected call control processor and notifying the selected call control processor number to the signal control device.

Then, the selected call control processor:
When activated by an outgoing call signal transferred from the load distribution processor, call control information after the outgoing call signal relating to the call is received from the signal control device to perform call connection control.

More specifically, the load distribution processor includes means for performing the following control.

(1) The monitoring result information output from each of the plurality of call control processors is received and set in a management table corresponding to each call control processor.

(2) When the processor usage rate of the monitoring result information exceeds a predetermined value and when all the outgoing lines are in a blocked state, the call control processor that has output the monitoring result information is selected from the selection targets. Remove.

(3) If there is no longer any call connection control processor to be selected, the signal control device is instructed to restrict the reception of a call signal from the preceding device.

(4) If the processor utilization of the monitoring result information received in the state in which the call restriction is instructed is lower than a predetermined value and at least one of the outgoing lines is in an idle state, The monitoring result information is incorporated into the output call control processor selection target, and the signal control device is instructed to release the call restriction.

(5) A call signal is received from the signal control device, and one of the selectable call control processors is selected based on information set in a management table corresponding to each call control processor.

(6) A call signal is transferred to the selected call control processor, and the selected call control processor number is notified to the signal control device.

(7) The number of vacant outgoing lines in the outgoing line busy / busy information of the information in the management table corresponding to the selected call control processor is decremented and updated.

(8) The call control processor in which the number of vacant outgoing lines in the updated outgoing line occupancy information becomes 0 is excluded from the next selection target.

(9) When there is no longer any call connection control processor to be selected as a result of the above (8), a call control is instructed to the signal control device.

With the above-described configuration, the signal control device that has received the call connection request from the preceding device instructs the load distribution processor to select a call control processor that processes the requested call. Based on this instruction, the load distribution processor determines which one of the plurality of call control processors to use in accordance with the load state of each call control processor that each call control processor periodically reports. When the load distribution processor selects a call control processor, the load distribution processor activates the call control processor and notifies the signal control device of the selected call control processor. The signal control device that has received the notification transfers the call control information after the call signal relating to the call to the selected call control processor so that the subsequent call control is left to the selected call control processor.

When it is determined that all the call control processors are in a high load state in the process of selecting the load distribution processors to achieve the load distribution of the call control processors, the selection operation is stopped and the call regulation is stopped. Instruct the signal controller to do so.

[0025]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of the apparatus for realizing the present invention and the relationship between the apparatuses.

The signal control device 1 accommodates lines from a plurality of preceding devices (terminal devices and preceding exchanges) (not shown), and upon receiving a call signal from the accommodated line, distributes the call signal to a load distribution unit. Processor (Distribute Control Processo)
r, hereinafter referred to as DCP). The DCP 2 that has received the call signal receives a call control processor (Call Control Tr).
ol Processor, hereinafter referred to as CLP) 3 to select an appropriate one by the processing described later and notify the signal control device 1 of the CLP number to give an instruction. The signal control device 1 that has received the instruction transmits the subsequent call connection control signal directly to the CLP 3 of the designated number without passing through the DCP 2.
The DCP 2 constantly monitors the load state of each CLP 3 and selects the CLP 3 so as to achieve an appropriate traffic distribution each time a call signal from the signal control device 1 is received. C
LP3 performs connection control based on a call signal distributed and transmitted by DCP2 and a call connection control signal after the call signal transmitted from signal control device 1,
Usage status of outgoing line resources under its own control (vacancy status)
And monitor processor utilization. Further, the information is notified to DCP2.

FIG. 2 is a diagram showing an embodiment of the functional blocks of the DCP 2 and the CLP 3 constituting the traffic load distribution control system of the present invention and the relationship between the functional blocks.

The CLP 3 periodically monitors the use status of the outgoing line resources to the downstream device under its control and the usage rate of its own processor, and notifies the DCP 2 of the information. 31 while D
The CP 2 centrally manages the resource information notified from the processing capacity resource state monitoring function unit 31 of each CLP 3,
CLP to which call signals should be distributed based on the load status of each CLP3
The monitoring status management function unit 22 that determines the CLP 3 and information on which CLP 3 to distribute to the monitoring status management function unit 22 is obtained from the monitoring status management function unit 22 and the information is appropriately assigned to any one of the plurality of installed CLPs 3. A call determination distribution function unit 21 for distributing a call signal to the mobile station, and a call restriction control for restricting reception of a call from the preceding device when receiving an overload state notification from the monitoring state management function unit 22. An overload monitoring restriction control function unit 23 that releases the call restriction control when notified of the recovery from the load state.

The processing operation of the traffic load distribution control system configured as described above will be described below.

FIG. 3 is a diagram showing an information collection processing operation performed by the processing capacity resource state monitoring function unit 31 of each CLP 3 in the traffic load distribution control method shown in FIG. In the DCP 2, the processing capacity resource state monitoring function unit 24 performs the same processing on the processor usage rate.

First, CLP3 used for switching connection is
Each of them monitors the use status of the outgoing line resources under its own management, and collects the number of available outgoing lines at a predetermined fixed n-second cycle. At the same period, the usage rate of the processor performing the call processing is collected (step 30).
1).

Next, each CLP 3 notifies the DCP 2 of the information on its own outgoing line resource usage status and processor usage rate collected as described above (step 3).
02). Thereafter, each CLP 2 collects this information and performs DC
The process of notifying P2 is periodically repeated.

FIG. 4 shows that in the traffic load distribution control method shown in FIG.
FIG. 5 is a diagram showing various processing operations performed based on information collected in step (a). The monitoring status management function unit 22 of the DCP 2
The number of outgoing line resources and the processor usage rate notified from LP3 are set in a management table prepared for each CLP (step 401).

When receiving the collected information from the CLP 3, it is determined whether or not the CLP 3 is incorporated in the load distribution CLP determining cyclic chain (step 402). The load distribution CLP determination cyclic chain is information in which, among a plurality of CLPs 3 provided in the multiprocessor control exchange, those having a normal load state are registered as operation target CLPs and their CLP numbers are registered. Although CLP3 that reported the collected information is incorporated in the chain,
If the report information indicates that the outgoing line resources are no longer available, or if the usage rate of the processor exceeds a predetermined specified value of m%, which is determined to be in a high load state, the CLP 3 will receive no more calls. It is determined that the connection request cannot be transmitted, and the connection request is removed from the load distribution CLP determination cyclic chain (step 403). That is, the call connection request is excluded from the selection targets of the CLP to be distributed.
If the CLP 3 registered in the cyclic chain is completely lost when the CLP 3 is removed from the chain in the above process, the CLP which can be distributed even if the DCP 2 receives a new call connection request.
3 is absent, and it is determined that an overload state is present.

When the monitoring state management function unit 22 of the DCP 2 determines that the system is overloaded, it notifies the overload monitoring regulation control function unit 23 of the overload state (step 4).
04). Upon receiving this overload state notification, the overload monitoring regulation control function unit 23 performs call regulation control for the signal control device 1 to regulate the reception of a call connection request from the preceding device (step 405).

Conversely, the notified information is the load distribution CL
CLP removed from P decision cyclic chain
The notification information from 3, there is a vacancy in the outgoing line in the report information,
If the processor utilization has a margin, specifically, if the utilization is lower than m-α, the CLP 3 is incorporated into a cyclic chain for determining a load distribution CLP (step 406). At the time of this incorporation, the reverse operation from step 404 is performed. In other words, if there is no CLP3 registered in the load distribution CLP-determined cyclic chain and a certain CLP3 is incorporated, an overload condition occurs because a new call signal destination CLP3 is generated. The monitoring status management function unit 22 of the DCP 2 sends an overload status release notification to the overload monitoring regulation control unit 23 (step 407). When the overload monitoring regulation control unit 23 receives the overload state release notification,
The signal control device 1 is controlled so as to release the call restriction for restricting the reception of the call connection request from the preceding device (step 408).

As described above, each time the notification information from each CLP 3 is received by the DCP 2, the above-described processing is executed to prepare for a distribution processor inquiry from the signal control device 1 via the load determination distribution function unit 21.

FIG. 5 is a diagram showing a processing operation at the time of receiving a call signal in the traffic load distribution control method shown in FIG. When receiving the call signal from the signal control device 1 (step 501), the load determination distribution function unit 21 inquires the monitoring state management function unit 22 about the CLP to process the call (step 502). When this inquiry is received, the monitoring state management function unit 22 obtains a CLP number for call connection processing from the cyclic chain for determining the load distribution CLP (step 503). Further, the monitoring state management function unit 22 subtracts one outgoing line resource vacancy number of the CLP 3 from the management table corresponding to the extracted CLP number (step 503). C to decision cyclic chain
The LP number is registered (step 504). If there is no free outgoing line resource as a result of the subtraction, it is determined that the CLP3 cannot be a target of a new call connection request transmission destination,
Re-registration to the load distribution CLP determination cyclic chain is not performed (step 505). At this time, load distribution CLP
When all the CLPs 3 registered in the determined cyclic chain are lost, the monitoring state management function unit 2 of the DCP 2
2 notifies the overload monitoring regulation control function unit 23 of the overload state (step 506).

When the CLP number to be connected is returned as a result of the above inquiry, the load determination distribution function unit 21 transmits the call signal received from the signal control device 1 to the corresponding CLP 3, The CLP number is notified to the signal control device 1. (Step 507). Thereafter, the call control is taken over by the corresponding CLP 3 and is directly connected to the signal control device 1 without going through the DCP 2 (step 508).

Upon receiving an overload status notification or an overload status release notification from the monitoring status management function unit 22, the overload monitoring restriction control unit 23 sends a call restriction instruction or a call restriction release instruction signal to the signal control device 1. Transmits and controls call regulation.

[0042]

As described above, according to the present invention, the number of available outgoing line resources and the processor utilization of each installed CLP are managed and periodically updated to identify an overloaded CLP. The following effects can be obtained because the configuration is possible. (1) The processor to be subjected to call connection processing is determined in a chain manner from the processing capacity and the presence / absence of switching resources, so that the processor load can be leveled. (2) Even if there is an overloaded CLP,
The load can be shifted to a CLP that has room without imposing a processing load on the LP. Therefore, a capability close to the exchange capability of the number of CLPs originally held can be exhibited, and a call connection service can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an apparatus configuration of the present invention and an interrelationship between the apparatuses.

FIG. 2 is a diagram showing one embodiment of DCP and CLP functional units and the interrelation of each functional unit blocks constituting the traffic load distribution control method of the present invention.

FIG. 3 is a flowchart showing an information collection processing operation of each CLP in the traffic load distribution control method shown in FIG. 2;

FIG. 4 is a diagram illustrating D of the traffic load distribution control method shown in FIG. 2;
9 is a flowchart showing a processing operation for setting information collected by the CP.

FIG. 5 is a flowchart showing a processing operation at the time of receiving a call signal in the traffic load distribution control method shown in FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Signal control apparatus 2 Load distribution processor 3 Call control processor 21 Load determination distribution function part 22 Monitoring state management function part 23 Overload monitoring regulation control function part 24 Processing capacity resource state monitoring function part 31 Processing capacity resource state monitoring function part

Claims (7)

[Claims] A plurality of call control processors which are responsible for call connection control, periodically monitor the usage rate of the own processor and the idle / busy state of the outgoing line managed by the own processor, and output the monitoring result information. In the multiprocessor control exchange, a signal control device for receiving a call connection control signal including a call signal transmitted from the preceding device by accommodating a plurality of lines from the preceding device, and the signal control device and the plurality of Connected to a call control processor, upon receiving a call signal from the signal control device, selecting one of the plurality of call control processors based on the monitoring result information output by the plurality of call control processors, A load distribution processor that transfers a call signal to the selected call control processor and notifies the selected call control processor number to the signal control device. For example, the selected call control processor, a multiprocessor control exchange traffic load distribution control method which is characterized in that a call connection control by receiving the call connection control signal subsequent calling signal from the signal controller. 2. A signal control device for receiving a call connection control signal including a call signal transmitted from the preceding device by accommodating a plurality of lines from the preceding device and connecting to the signal control device, A plurality of call control processors that are in charge of connection control and periodically monitor the usage rate of the own processor and the occupied state of the outgoing line managed by the own processor and output the monitoring result information; and the signal control device and the plurality of call control processors. Multi-processor control switch comprising a load distribution processor connected to a call control processor for selecting one of the plurality of call control processors and instructing call connection control upon receiving a call signal from the signal control device. In the load distribution processor, the monitoring result information output from each of the plurality of call control processors is received, and a management table corresponding to each call control processor is received. When the processor usage rate of the monitoring result information exceeds a predetermined value and when all outgoing lines are in a blocked state, the call control processor that outputs the monitoring result information instructs call connection control. If there is no longer any call connection control processor to be selected, the signal control device is instructed to call control to restrict the reception of a call signal from the preceding device. A traffic load distribution control method for a multiprocessor controlled exchange, comprising: 3. The control means of the load distribution processor instructing the call restriction, wherein the processor usage rate of the received monitoring result information falls below a predetermined value and at least one of the outgoing lines becomes idle. If this is the case, the call control processor that outputs the monitoring result information is incorporated as a selection target for instructing call connection control, and the call control for releasing the signal control device from accepting a call signal from a preceding device is released. 3. The method according to claim 2, further comprising means for instructing release. 4. A signal control device for receiving a call connection control signal including a call signal transmitted from the preceding device by accommodating a plurality of lines from the preceding device and connecting the signal control device to the call controller. A plurality of call control processors that are in charge of connection control and periodically monitor the usage rate of the own processor and the occupied state of the outgoing line managed by the own processor and output the monitoring result information; and the signal control device and the plurality of call control processors. Multi-processor control switch comprising a load distribution processor connected to a call control processor for selecting one of the plurality of call control processors and instructing call connection control upon receiving a call signal from the signal control device. In the load distribution processor, the monitoring result information output from each of the plurality of call control processors is received, and a management table corresponding to each call control processor is received. Upon receiving a call signal from the signal control device, any one of the plurality of call control processors based on information set in the management table corresponding to each of the plurality of call control processors. And transfers a call signal to the selected call control processor, notifies the selected call control processor number to the signal control device, and stores information in the management table corresponding to the selected call control processor. The number of vacant outgoing lines in the outgoing line busy / busy information is updated by subtracting one, and the call control processor in which the number of vacant outgoing lines in the updated outgoing / busy information becomes 0 is called for the next call connection request. Traffic load distribution control for a multiprocessor control switch, comprising control means for removing a call control processor for instructing connection control from selection targets. Formula. 5. The control means of the load distribution processor instructs the call control processor in which the number of vacant outgoing lines in the updated outgoing line occupancy information becomes 0 in response to the next call connection request. As a result of removing the call control processor from the selection target, when there is no longer any call connection control processor to be selected, the signal control device imposes a call restriction for restricting reception of a call signal from a preceding device. 5. The traffic load distribution control method for a multiprocessor controlled exchange according to claim 4, further comprising means for instructing. 6. A plurality of call control processors for performing call connection processing, a load distribution processor for controlling load distribution of the plurality of call control processors in response to an accepted call connection request and selecting one call control processor. A signal control device for receiving a call signal transmitted from a preceding device and transferring the signal to a load distribution processor, the call control processor comprising: A processing capacity resource status monitoring function unit for periodically monitoring the usage status and the processor usage rate and notifying the monitoring result information to the load distribution processor, wherein the load distribution processor has a processing capability of the plurality of call control processors. When the monitoring result information notified from the resource status monitoring function unit is received, the management data prepared for each call control processor is received. The call control processor outputs the monitoring result information when the monitoring result information is set in the table and the processor usage rate of the monitoring result information exceeds a predetermined value and when the number of available outgoing line resources is 0. Is excluded from the selection of the call control processor to be used for the call connection request, and when the processor usage rate of the monitoring result information falls below a predetermined value and there is at least one available outgoing line resource, the monitoring result is The call control processor that has output the information is incorporated into the selection target of the call control processor to be used for the call connection request, and when the signal control device receives a call connection request based on the received call signal, One call control processor to be used is selected from the call control processors to be selected, and the selected call control processor is selected. A monitoring state management function unit that returns the processor number of the server, upon receiving a call signal transferred from the signal control device, instructs the monitoring state management function unit to select a call control processor to be used, When the processor number of the call control processor selected based on the instruction is returned, a call signal is transmitted to the selected call control processor, and the processor number of the call control processor is transmitted to the signal control device. A load determination distribution function unit, wherein the signal control device sets a processor number of the call control processor selected by the load distribution processor as a target to execute a call connection control corresponding to the call signal received from the preceding device. Upon receipt from the load distribution processor, subsequent call connection processing is performed directly with the call control processor. Traffic load balancing control system of controlled exchange. 7. The load distribution processor further comprises: if the processor utilization ratio in the monitoring result information received by the load distribution processor from the call control processor exceeds a predetermined value or there is no available outgoing line resource, Alternatively, when a call control processor instructing the call connection processing of the call signal is selected and the number of available outgoing line resources is subtracted by 1 in the information of the management table corresponding to the call control processor, the number becomes 0, and the next call connection request becomes When the number of call control processors to be selected becomes 0 as a result of removing the call control processor from the selection target for instructing the call connection processing, the signal control device is restricted from accepting the call signal from the preceding device. Indicating call regulation, wherein the load distribution processor has a processor utilization rate in the monitoring result information received from the call control processor. As a result of incorporating the call control processor into the selection target of the call control processor instructing the call connection control for the next call connection request because the number of available outgoing line resources is less than the predetermined value and there is at least one available outgoing line resource, When the number of call control processors to be selected changes from 0 to 1, the overload monitoring restriction instructs the signal control device to release the restriction on the reception of the call signal from the preceding device. 7. The traffic load distribution control method for a multiprocessor control exchange according to claim 6, further comprising a control function unit.