JPH05292126A - Congestion control system for exchange - Google Patents

Abstract

PURPOSE:To release the congestion efficiently by preventing call interruption of each communication control module due to processor congestion in the congestion control of the exchange so as to reduce a time till the release of congestion. CONSTITUTION:A packet exchange 6 has a monitor module 2 monitoring the operating rate of a CPU of a communication control module 3, and the monitor module 2 informs a congestion prediction signal 204 to a node control module 1 when the operating rate of the CPU of the communication control module 3 is higher than its tendency by a default and less than a predetermined congestion reference rate to allow the communication control module 3 to restrict the data reception. When the operating rate of the CPU of the communication control module 3 is lower than the default of the operating rate of the CPU, the monitor module 2 sends a congestion release signal 206 to a node control module 1 to release the processor congestion of the communication control module 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a congestion control system for a switching system, and more particularly to a processor congestion control method in which the CPU usage rate of each communication control module such as a call control processing unit or a subscriber line signal processing unit is predetermined. If the standard value is exceeded,
The present invention relates to a congestion control method of an exchange that determines processor congestion.

[0002]

2. Description of the Related Art Conventionally, in this type of exchange, a node control module periodically sends a CPU usage rate request signal to each communication control module, and the communication control module sends the CPU
A CPU usage rate notification signal for notifying the usage rate is received. When the CPU usage rate according to the CPU usage rate notification signal exceeds a predetermined reference value of processor congestion, the node control module sends a reception disable signal to the corresponding communication control module. The communication control module that has received this reception disable signal transmits a reception disable signal to the communication control module of the communication partner, discards the data transmitted from the communication control module of the other party, and issues a call disconnection request to the communication control module of the other party. To regulate the acceptance of new calls.

The CP from the communication control module
When the CPU usage rate according to the U usage rate notification signal falls below a predetermined reference value of processor congestion, the node control module transmits a reception enable signal to the communication control module having the corresponding processor congestion. The communication control module that has received the reception enable signal transmits the reception enable signal to the communication control module of the communication partner, and the processor congestion is released. In this way, processor congestion control is performed.

FIG. 3 is a sequence diagram showing the congestion control of the conventional exchange, in which the node control module 101 periodically sends the CPU to the communication control modules 103 and 104.
The usage rate request signal 301 is transmitted. The communication control modules 103 and 104 include a CPU in the node control module 101.
The usage notification signal 302 is transmitted. The node control module 101 compares the CPU usage rate according to the CPU usage rate notification signal 302 received from each of the communication control modules 103 and 104 with a predetermined congestion reference value. When the CPU usage rate notified from the communication control module 103 exceeds the congestion reference value, the node control module 101 sends a reception disable signal 303 to the communication control module 103.

The communication control module 103 that has received the reception disable signal 303 is the communication control module 1 of the communication partner.
After transmitting the reception disable signal 303 to 04, the call disconnection signal 304 is transmitted to disconnect the call.

The node control module 101 receives the CP notified from the communication control module 103 during processor congestion.
When the usage rate of U falls below a predetermined congestion cancellation reference value, the reception enable signal 3 is sent to the communication control module 103.
05 is sent. The communication control module 103 which has received the reception enable signal 305 transmits the reception enable signal 305 to the communication control module 104 to release the processor congestion and accept the calling signal 306.

[0007]

In the above-mentioned conventional exchange, the node control module has the CPU usage rate notified by the communication control module and a predetermined fixed value in any time zone. Since the processor congestion control is performed by comparing with the congestion reference value, sudden abnormal congestion cannot be predicted in the time zone when the CPU usage rate is low, and the processor congestion state suddenly occurs, so the communication control module stops at this time. Without having to disconnect the call and regulate new calls. Further, since the congestion reference value is set high, it takes a long time to reduce the CPU usage rate and release the congestion, so that the congestion cannot be released efficiently.

An object of the present invention is to eliminate the above-mentioned conventional problems, prevent the call disconnection due to the processor congestion of each communication control module in the congestion control of the exchange, and shorten the time until the congestion is released to reduce the congestion. An object of the present invention is to provide a congestion control method for exchanges that can be released efficiently.

[0009]

A first solution of the present invention for solving the above-mentioned problems is a digital exchange comprising a plurality of signal processing devices equipped with a dedicated processor, and a node control module as the signal processing device. And at least two communication control modules are connected to each other via a common bus so that data can be exchanged. In the congestion control method of the exchange, 24 hours are divided into a plurality of time zones, and each of the time zones is divided into a plurality of time zones. The utilization rate of the dedicated processor of the communication control module is calculated as a tendency value, and a CPU notification signal is received from each of the communication control modules according to a processor congestion determination request signal that is periodically received from the node control module. The CPU usage rate according to the CPU notification signal is the tendency value corresponding to the CPU notification signal reception time zone When a predetermined predetermined value is higher than the predetermined congestion reference value and lower than a predetermined congestion reference value, sending a congestion prediction signal indicating the congestion prediction of the communication control module that has sent the CPU notification signal to the node control module, and CPU by new CPU notification signal after sending
The node control module that receives the congestion prediction signal comprises a monitoring module that sends a congestion release signal to the node control module when the usage rate falls below the corresponding trend value plus the default value, and the node control module receives the corresponding communication control. Sending a reception not possible signal to the module to suspend new data transmission and reception during processor congestion, and the node control module that received the congestion release signal is a reception enable signal to the corresponding communication control module during processor congestion. To release processor congestion.

The congestion control method for an exchange according to the second solving means of the present invention for solving the above-mentioned problems is characterized in that the function of the monitoring module is included in the node monitoring module in the first solving means. To do.

[0011]

Function: The monitoring module is the CPU of the communication control module
When it is higher than the tendency value of the usage rate by a predetermined value and is equal to or less than a predetermined congestion reference value, a congestion prediction signal is notified to the node control module to cause the communication control module to regulate data reception. Then, when the CPU usage rate of the communication control module falls below the default value of the CPU usage rate, the monitoring module sends a congestion release signal to the node control module to release the processor congestion of the communication control module.

[0012]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of an embodiment of the present invention, and FIG. 2 is a sequence diagram showing an operation of a packet switch which is an example of the present invention. In FIG. 1, the packet switch 6 is a multiprocessor type switch.
The node control module 1 and the monitoring module 2, which are each processing unit having a dedicated central processing unit, and the communication control modules 3 and 4 are connected to each other by a common bus 5 capable of bidirectionally transmitting and receiving data and control signals. It is configured. Each of the communication control modules 3 and 4 is, for example, a subscriber line signal processing device, a common line signal processing device, a trunk line signal processing device or an individuality processing device.

The operation of such a multiprocessor type packet switch 6 will be described below with reference to FIG.
The node control module 1 sends a congestion determination request signal 201 to the monitoring module 2 at regular intervals. The monitoring module 2 sends a CPU usage rate request signal 202 to each of the communication control modules 3 and 4 according to the congestion judgment request signal 201 sent periodically. The communication control modules 3 and 4 respond to the CPU usage rate request signal 202 with C
The PU usage rate notification signal 203 is sent to the monitoring module 2.
Then, the monitoring module 2 has the communication control modules 3 and 4
The trend value 10 of the CPU usage rate in each time zone is sequentially calculated and stored.

In this way, after the trend value 10 of the CPU usage rate in each communication control module in each time zone is once calculated, the CPU usage rate in a certain time zone notified from the communication control module 3 is In the case where the CPU usage rate in the corresponding past same time zone is higher than the above-mentioned tendency value 10 by the predetermined value and lower than the predetermined reference value of the processor congestion, the monitoring module 2 notifies the node control module 1 of the congestion prediction signal. 204 is sent to notify the processor congestion of the communication control module 3.

The node control module 1 that has received the congestion prediction signal 204 sends a reception disable signal 205 to the corresponding communication control module 3. This unreceivable signal 20
The communication control module 3 which has received 5 sends the reception disable signal 205 to the communication control module 4 of the other party to which the data is sent, and discards the data sent from the communication control module 4. After that, when the CPU usage rate sequentially notified from the communication control module 3 becomes lower than the trend value of the CPU usage rate in the corresponding time zone, the monitoring module 2 notifies the node control module 1 of the congestion release signal 20.
6 is sent out. The node control module 1 that has received this congestion release signal 206 sends out a reception enable signal 207 to the communication control module 3 during the relevant processor congestion.

The communication control module 3 which has received the reception enable signal 207 from the node control module 1 sends the reception enable signal 207 to the communication control module 4 of the communication partner to release the processor congestion and accept the data 208. In this way, the CPU usage rate in each of the communication control modules 3 and 4 in each time zone is between the precalculated trend value of the CPU usage rate and the reference value of the processor congestion,
Moreover, when the current CPU usage rate is higher than the tendency value by the predetermined value, it is predicted that the communication control module will have processor congestion, and the congestion prediction signal 204 is sent to the node control module 1. Further, by causing the communication control module to send the reception disable signal 205 to suspend acceptance of new data in the communication control module, congestion of the processor is avoided. A congestion control system of an exchange may be used in which all functions of the monitoring module 2 are provided in the node control module. In the exchange, not only the packet switch as in the above example but also other digital exchanges. Anything will do as long as it is available.

[0017]

As described above, by providing the monitoring module for constantly calculating the CPU usage rate for each time zone of each communication control module and determining the processor congestion, the CPU of the communication control module is With regard to abnormal congestion in a time zone where the usage rate is low, an increase in the CPU usage rate for each time zone can be predicted from the trend value of the CPU usage rate and the actual CPU usage rate. The data of the communication control module can be regulated by notifying the node control module of the congestion prediction signal before the predetermined processor congestion reference value is exceeded, and the processor congestion can be achieved in a short time without disconnecting the call. There is an effect that can be released.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a packet switch according to an embodiment of the present invention.

FIG. 2 is a sequence diagram according to the present invention.

FIG. 3 is a sequence diagram of congestion control of a conventional packet switch.

[Explanation of symbols]

 1 node control module 2 monitoring module 3, 4 communication control module 5 bus 6 packet switch 201 congestion determination request signal 202, 301 CPU usage rate request signal 203, 302 CPU usage rate notification signal 204 congestion prediction signal 205, 303 unreceivable signal 206 Congestion release signal 207,305 Receivable signal 208,308 Data 304 Call disconnection signal 306 Call request signal 307 Connection completion signal

Claims (2)

[Claims] 1. A digital exchange comprising a plurality of signal processing devices having a dedicated processor, wherein a node control module and at least two communication control modules as the signal processing devices are connected to each other via a common bus so that data can be exchanged. In the congestion control method of the exchange, 24 hours are divided into a plurality of time zones, and the usage rate of the dedicated processor of each communication control module in each time zone is calculated as a trend value, and the node A CPU notification signal is received from each of the communication control modules in response to a processor congestion determination request signal that is periodically received from the control module, and the CPU usage rate according to the CPU notification signal corresponds to the CPU notification signal reception time zone. When the value is higher than the tendency value by a predetermined value and lower than the predetermined congestion reference value, the CPU The tendency that the congestion prediction signal indicating the congestion prediction of the communication control module that has sent the intelligent signal is sent to the node control module, and the CPU usage rate by the new CPU notification signal after sending this congestion prediction signal corresponds Value plus a monitoring module that sends a congestion release signal to the node control module when it is lower than the default value, the node control module that has received the congestion prediction signal, sends a non-reception signal to the corresponding communication control module And to interrupt the new data transfer to be in processor congestion, and the node control module that received the congestion release signal sends a receivable signal to the communication control module in the corresponding processor congestion to reduce processor congestion. A congestion control method for an exchange characterized by releasing it. 2. A congestion control system for an exchange according to claim 1, wherein the function of the monitoring module is included in the node monitoring module.