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Abstract

A method for controlling an overload of a main processor by assigning to the main processor of a distributed switching system with a hierarchy structure a function of informing associated lower-level processors of an occurrence of the overload, an increase in call suppression, a decrease in call suppression and a release of the overload upon controlling the overload, and assigning to the lower-level processors a function of automatically calculating the number of calls to be processed in response to a demand of the main processor, and controlling traffic affecting the main processor on the basis of the result of the calculation, so as to maintain a stable service condition for the overload control interval. A control for the overload is carried out by lower-level processors of the distributed type to calculate and control the number of calls to be accepted while a determination about the overload is carried out by a processor associated with the overload, capable of continuously providing stable services while minimizing failure of services through determination about and control of an overload. In the overload determination, an execution delay condition based on a priority assigned to the processor is taken into consideration, together with a CPU occupancy rate.

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First Claim