Method for controlling overload in centralized and distributed operating hybrid switching system
First Claim
1. A method for controlling an overload in a full electronic switching system including an operation and maintenance processor adapted to record an accounting and to provide an interface with an operator, a number translating processor adapted to perform a number translation, an internal network processor adapted to connect space switches, and a plurality of access switching processors arranged in a distributed manner around the operation and maintenance processor, the number translating processor and the internal network processor, the method comprising the steps of:
- (A) executing a control for an overload caused by an operator by use of an originating call approval value, an input trunk call approval value, and a terminating and output trunk call approval value for calls from the operator to be accepted for a first predetermined time period;
(B) detecting an execution delay condition of each of the processors in the order of priorities respectively assigned to the processors and determining a system overload of each processor on the basis of the result of the detection;
(C) detecting a CPU occupancy rate of each processor at intervals of a second predetermined time period, detecting an execution delay condition of a call processing process at intervals of the first predetermined time period, and determining a traffic overload of the processor on the basis of the detected CPU occupancy rate and the detected execution delay condition; and
(D) executing an overload control depending on a kind of overload generated, as one of an operator overload, a system overload and a traffic overload, in a selected one of the access switching processors associated with the generated overload at intervals of the first predetermined time period.
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Abstract
A method for controlling an overload in a hybrid full electronic switching system, capable of maintaining a stable service condition for an overload control interval and realizing a priority control depending on the type of call by sorting an overload occurring in the system into an overload associated with processors adapted to execute services in a centralized manner and an overload associated with processors adapted to execute same services in a distributed manner and thereby automatically calculating numbers of calls to be accepted respectively for control intervals for two kinds of overloads in different control manners. The method includes two different control procedures respectively applied to a case wherein a reduction in overload can be carried out in a processor involving the overload and a case wherein a reduction in overload can be carried out by limiting services to be executed in other processors.
25 Citations
10 Claims
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1. A method for controlling an overload in a full electronic switching system including an operation and maintenance processor adapted to record an accounting and to provide an interface with an operator, a number translating processor adapted to perform a number translation, an internal network processor adapted to connect space switches, and a plurality of access switching processors arranged in a distributed manner around the operation and maintenance processor, the number translating processor and the internal network processor, the method comprising the steps of:
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(A) executing a control for an overload caused by an operator by use of an originating call approval value, an input trunk call approval value, and a terminating and output trunk call approval value for calls from the operator to be accepted for a first predetermined time period; (B) detecting an execution delay condition of each of the processors in the order of priorities respectively assigned to the processors and determining a system overload of each processor on the basis of the result of the detection; (C) detecting a CPU occupancy rate of each processor at intervals of a second predetermined time period, detecting an execution delay condition of a call processing process at intervals of the first predetermined time period, and determining a traffic overload of the processor on the basis of the detected CPU occupancy rate and the detected execution delay condition; and (D) executing an overload control depending on a kind of overload generated, as one of an operator overload, a system overload and a traffic overload, in a selected one of the access switching processors associated with the generated overload at intervals of the first predetermined time period. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification