JPH08274839A - Data reception regulating method for communication system overload - Google Patents

Abstract

PURPOSE: To prevent connection from being cut off by the overload state monitor time-out of an opposite connected station when the overload state of a present system is continued in a communication system provided with an overload detecting mechanism. CONSTITUTION: In the communication system provided with an overload control part 1 for performing the overload detection and overload control of the system, the overload control part 1 is provided with a temporary reception regulation cancel control module 3 for monitoring the time of overload continuation during the overload state of the system and when the overload state is continued for a long time, the reception regulation is temporarily canceled. Thus, the connection is prevented from being cut off by the overload state monitor time-out of the opposite connected station.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of notifying an overload in a communication system having an overload detection mechanism, and particularly when a communication system overload is suitable for avoiding disconnection due to an overload state monitoring timeout. Data reception regulation method.

[0002]

2. Description of the Related Art When a certain amount of overload occurs in a communication system due to processing concentration or the like, reception is rejected according to the procedure of each line for all connected partner stations so as not to be overloaded by new data reception. I was sending a notification. For example, International Telegraph and Telephone Consultative Committee (CCITT) Recommendation X.2
In No. 5, it is stipulated that an RNR packet is transmitted until a receivable state is reached as an operation when the connection with the packet network is overloaded. In the conventional method, a reception refusal notification is transmitted as unreceivable until the overloaded state is recovered.

[0003]

In the above-mentioned prior art, since the receivable notification is not transmitted to the partner station until the overloaded state of the communication system is recovered, when the overloaded state continues for a long time, the overloaded state is overloaded. There was a problem that the connection partner station with the status monitoring function detected the overload status monitoring timeout and disconnected the connection. The purpose of the present invention is to
This is to avoid disconnection when the overload condition of the local system occurs.

[0004]

Means for Solving the Problems The above-mentioned object is to provide means for detecting system overload (2, 4 in FIG. 1), means for restricting reception when overloaded (2, 5 in FIG. 1), and system. Means for monitoring the duration of the overload state (reception regulation) and continuing / releasing the reception regulation (3, 5 in FIG. 1), and when the system overload state continues for a long time, This is achieved by temporarily transmitting a receivable notification to the partner station before the overload state monitoring timeout occurs.

[0005]

In the present invention, the overload control module is
The system load is calculated at a predetermined cycle by an interrupt from the timer supply module, and the reception processing section is instructed to "start" or "end" the reception restriction, and if it is judged that the overload condition has occurred this time, the temporary reception restriction release control The overload start notification is sent to the module, and if it is determined that the overload state is continued after the previous time, the overload continuation notification is given, and if it is determined that the overload state is recovered this time, the fact is notified. On the other hand, the temporary reception regulation release control module has a timer for measuring the reception regulation duration time and the reception regulation release duration time, and when receiving the overload start notification, the timer is activated and the temporary reception regulation is set to “before cancellation”. In addition, when the overload continuation notification is received, the timeout is checked, the reception restriction “end” or “start” is instructed to the reception processing unit, and the timer is activated and the temporary reception restriction is set to “during release” or “before release”. When the overload recovery notification is received, the timer is stopped and the "non-overload state" is set. In this way, while accurately understanding the load status of the own system,
Appropriate reception restrictions can be made. In particular, when the overloaded state of the local system continues for a long time, it is possible to avoid disconnection due to the overloaded state monitoring timeout of the connected station.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention is shown in FIGS. FIG. 1 is a schematic diagram of a communication system having an overload detection mechanism, and shows a module structure of an overload control unit and a reception processing unit in the system. Overload control unit 1
Is an overload control module 2 that calculates the load of the communication system at regular intervals to check whether there is an overload and controls reception regulation start and cancellation, and a timer for the overload control module 2 at regular intervals. The timer supply module 4 for supplying an interrupt and the temporary reception restriction release control module 3 for controlling the start and end of the temporary reception restriction release when the communication system is overloaded. The reception processing unit 5 receives an instruction from the overload control module 2 and the temporary reception restriction release control module 3 and transmits a reception refusal notification and a reception enable notification to the line. In the temporary reception regulation release control module 3, a timer A that monitors from the overload state until the temporary reception regulation is released and a timer B that monitors from the temporary reception regulation release to the start of the reception regulation again. It has two timers, and controls the start and end of temporary reception restriction release.

Overload control unit 1 of such a communication system
The control procedure of the overload control module 2 and the temporary reception restriction release control module 3 will be described with reference to the flowcharts of FIGS. 2 and 3. First, the processing of the overload control module 2 for calculating the load of the communication system and checking whether or not there is an overload and controlling reception regulation start and cancellation will be described with reference to FIG. S1 ... The overload control module 2 is activated at regular intervals by a timer interrupt from the timer supply module 4, and calculates the load of the communication system using the communication system operating time within the constant period. S2, S3, S6 ... Compares the overload state at the time of the previous timer interrupt and the overload state at the time of this timer interrupt, and the communication system falls into the overload state, recovers from the overload state, or remains in the overload state. I will check. S4, S5 ... When the communication system is overloaded,
In order to transmit the reception refusal notification to the line, a reception regulation start instruction is issued to the reception processing unit 5. Further, the temporary reception restriction release control module 3 is activated to issue an overload start notification. S7, S8 ... When the communication system recovers from the overloaded state, a reception regulation end instruction is issued to the reception processing unit 5 in order to transmit a receivable notification to the line. Also, the temporary reception restriction release control module 3 is activated to issue an overload recovery notification. S9 ... If the communication system is still overloaded,
The temporary reception restriction release control module 3 is activated to issue the overload continuation notification. S10 ... Remember the current overloaded state of the communication system,
The processing of the overload control module 2 ends.

Next, the processing of the temporary reception restriction release control module 3 which controls the start and end of the temporary reception restriction release when the communication system is overloaded will be described with reference to FIG. S11 ... The temporary reception restriction release control module 3 is activated by the overload control module 2 at regular intervals when the communication system is overloaded, and is notified of an overload start notification, an overload continuation notification, and an overload recovery notification. S12 ... When the notification from the overload control module 2 is an overload start notification, the timer A is started to monitor whether the reception restriction is temporarily released. The value of the timer A can be changed for each partner station connected to the system and is preset. After starting the timer A, each time it receives the overload continuation notification from the overload control module 2, it is checked whether it has timed out. S13 ... The process is terminated by remembering that the current temporary reception restriction release state is before release. S14, S15 ... If the notification from the overload control module 2 is an overload continuation notification and the current temporary reception restriction release state is before release, it is checked whether the timer A has timed out and the temporary reception restriction release is started. Check whether to do or not. If the timer A has not timed out, the processing is terminated and the reception restriction release is continuously monitored. S16 ... When the timer A times out, a reception restriction end instruction is issued to the reception processing unit 5 to temporarily cancel the reception restriction. S17 ... Then, the timer B is activated to monitor the start of the reception regulation again. The value of the timer B can be changed for each partner station connected to the system and is preset. After starting the timer B, like the timer A, each time it receives the overload continuation notification from the overload control module 2, it is checked whether a time-out has occurred. S18 ... The process is ended by remembering that the current temporary reception restriction release state is being released. S14, S19 ... When the notification from the overload control module 2 is the overload continuation notification and the current temporary reception restriction release state is being released, it is checked whether the timer B has timed out and the reception restriction is started again. Check whether or not. If the timer B has not timed out, the processing is terminated and the reception regulation start is continuously monitored. S20 ... When the timer B times out, the reception restriction start instruction is issued to the reception processing unit 5 in order to end the temporary reception restriction release and perform the reception restriction again. S21 ... Then, the timer A is started again, and the process until the temporary reception restriction release is monitored again. S22 ... The current temporary reception restriction release state is returned to the state before the release, and the process ends. S23, S24 ... When the notification from the overload control module 2 is an overload recovery notification, the timer A and the timer B that monitor the start and end of the temporary reception restriction release are stopped. S25 ... Remember that the current overloaded state of the communication system is the non-overloaded state, and the process ends.

[0009]

As described above, in the communication system having the overload detection mechanism, it is possible to avoid the disconnection due to the overload state monitoring time-out of the connection partner station when the overload state of the own system continues.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a communication system having an overload detection mechanism according to an embodiment of the present invention.

FIG. 2 is a flowchart showing processing of an overload control module according to an embodiment of the present invention.

FIG. 3 is a flowchart showing a process of a temporary reception restriction release control module according to an embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Overload control part, 2 ... Overload control module, 3 ... Temporary reception regulation release control module, 4 ... Timer supply module, 5 ... Reception processing part.

Claims (1)

[Claims] 1. A data reception regulation method for a communication system comprising means for detecting system overload and means for regulating reception when the system is overloaded, and means for monitoring the duration of system overload is provided. If an overload is detected, the reception restriction is performed and the overload duration time is monitored. If the overload continues for a certain period of time, the reception restriction is temporarily released and a receivable notification is sent to the partner station. A method for regulating data reception when a communication system is overloaded.