JPS59111493A - Load control system - Google Patents

Abstract

PURPOSE:To avoid overload even if the number of processing requests is increased by varying the interrupting period in response to the magnitude of load of a central controller in a central controller of a telephone exchange. CONSTITUTION:The state of call processing load of the central controller CC1 is detected by a detecting section 2, the periodic signal from a basic period signal generating section 4 is varied in response to the output signal and an output is generated from the period control section 5 to a period interrupting request section 3. When the load state of the device CC1 is less than 40%, a utilizing efficiency signal (a) of the device 1 is detected by the detecting section 2 and when the signal is given to a frequency dividing circuit 50 via a selecting circuit 51, the frequency division circuit 50 performs the control command so that the selecting circuit 51 selects a frequency dividing signal T1, a period interrupting request section 3 performs the interrupting request in the period of the signal T1 to the device CC1 and frequency dividing signals T2, T3 are selected depending on the utilizing efficiency of the device CC1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a load control system, and more particularly to a load control system for a central controller in an automatic switching system.

[Prior art and problems]

Generally, when the central control unit in an automatic exchange processes calls from subscribers that occur randomly in real time, requests from subscriber circuits, etc. are not immediately processed at the time of request generation, but are processed in short cycles ( For example, by detecting the presence or absence of the request every 16 m5 (so-called look-in method), processing is executed in collaboration with software. Therefore, as the number of requests increases, the load on the central controller increases, and if an overload condition occurs, the real-time performance of call processing is impaired.

Conventionally, this overload condition has been dealt with by installing in advance a central control unit with sufficient call processing capacity to avoid this overload condition, which has had the disadvantage of increasing the initial equipment cost of the automatic V switching machine.

[Purpose of the invention]

An object of the present invention is to provide a load control method that eliminates the above-mentioned drawbacks and prevents an overload state of the central controller by making the interrupt period variable according to the magnitude of the load on the central controller. It's all about providing.

[Summary of the invention]

The load control method according to the present invention includes, in an automatic exchange, a detection means for detecting the load condition of a central control unit, an interrupt requesting means for requesting a periodic interrupt from the central control unit, and a generation means for generating a basic periodic signal. The present invention is characterized in that it further comprises period control means for making the number of the period 4 variable by the output signal of the detection means. Further, the period control means is characterized in that it includes a frequency dividing circuit that divides the frequency of the basic period signal from the generating means, and a selection circuit that selects and outputs a predetermined frequency divided signal according to the output signal of the detecting means. do.

[Embodiments of the invention]

Drawings next? The present invention will be explained with reference to the following.

FIG. 1 is a block diagram showing an entire embodiment of the load control method of the present invention, and FIG. 2 is a circuit block diagram showing an example of the configuration of the periodic control section in FIG. 1. In FIG. 1, automatic conversion includes a central control unit (hereinafter referred to as CC) 1 and a load detection unit (hereinafter referred to as DE) that detects the call processing load status (usage efficiency) of the CC1.
T) 2, a periodic interrupt request unit (hereinafter referred to as REQ) 3 that makes all periodic interrupt requests to the CC1, a basic period generation unit (hereinafter referred to as GEN) 4 that generates a basic period signal, and A period control unit (hereinafter referred to as C
NT) 5.

Next, in FIG. 2, CNT5 divides the fundamental periodic signal To' (for example, 16m5 periodic tone) from GEN4 into frequency-divided signals T1, T2, and T3 (for example, each of 32m5).
A frequency divider circuit (hereinafter referred to as Did) 50 that outputs 5, 48m5, 54m5 periodic signals), CCCC efficiency signals b and c (for example, 40ch each) from DET2.

60%, 80% load signal) from the DIV50. Select T2, T3 k and 1RE
It is configured to include a selection circuit (hereinafter referred to as 5EL) 51'e that outputs to Q3. Note that the 5EL51 outputs the frequency divided signal T! in correspondence with the CC usage efficiency signals a, b, and c, respectively, according to the instruction from the DIV50. , T2. Select T3.

Next, FIG. 3 is a time chart showing an example of input/output signals of the frequency dividing circuit in FIG. 2. In the same figure, 15m
Basic periodic signal T with 5 periods. Divided by FiDIV50 (shown in Figure 2), 32m5, 48m5, 54m, respectively.
A divided signal of 5 periods T1 y T2 e T3 (!: becomes.

Next, the operation of this embodiment will be explained. When the CCI load status is less than 40%, DET2 detects the CC usage efficiency signal affi and sends it to DiV via iSEL51.
Since the 50VC transmission current L)IV50 gives a control instruction so that the %1SEL51 selects the frequency-divided signal T1, the frequency-divided signal T□ is transmitted from the 5EL51 to REQ3. Therefore, R and EQ3 issue an interrupt request to the CCI every 32m5 cycles. In addition, the load on the CCI increased to 40%.
% or more and less than 60%, and 60% or more and less than 80%, the above DE
T2 respectively detects the CCCC efficiency signal sC,
Similarly, the frequency-divided signal T2. Based on T3, an interrupt request from Mu recorder EQ3 to the CCI is made in cycles of 48m5 and 54m5, respectively.

Note that DET2. in this example. REQ3 and GBN
4 are all generally known, and 1)
IV501'i General frequency divider circuit VC8EL51 He17
) A simple control instruction function has been added. Further, although the selection circuit is illustrated as hardware, the selection function is generally performed by a microprogram.

This embodiment does not limit all failures. That is,
The load status of the central control unit is 40%.

Although three stages of less than 60% and 80% are illustrated, the percentage and the number of stages may be determined arbitrarily.

Furthermore, it goes without saying that the basic period signal is not limited to a period of 16 m5, and the integer ratio of frequency division may be arbitrarily determined.

〔Effect of the invention〕

As is clear from the above explanation, according to the load control method of the present invention, as the load on the central control unit increases, the interrupt request cycle is widened to completely avoid overloading the central control unit. The remarkable effect is that it is possible to process calls in real time very economically without the need for the initial installation of a central control unit with a large processing capacity.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the load control method of the present invention, FIG. 2 is a circuit block diagram showing an example of the structure of the periodic control section in FIG. 1, and FIG. 3 is a frequency division diagram in FIG. 2. 5 is a time chart showing an example of input/output signals of the circuit. In the figure, 1°°'°゛・Central control unit CC, 2...Load detection unit DET. 3... Periodic interrupt request section R, EQ, 4...
...Basic cycle generation unit GEN, 5...Cycle control unit CNT, 50...Frequency divider circuit DIV, 51.
...Selection circuit SEL. 7-′-＼・、

Claims (1)

[Claims] (1) In an automatic switching system, a detecting means for detecting the load condition of a central control unit, an interrupt requesting means for requesting a periodic interrupt from the central control unit, a generating means for generating all the basic periodic signals, and a generating means for generating all the basic periodic signals. A patented load control method that includes periodic control means that is variable based on the output signal of the detection means. (2. In the load control method described in claim (1), the period control means includes a frequency dividing circuit that divides the frequency of the basic period signal from the generating means, and a frequency dividing circuit that divides the frequency of the basic period signal from the generating means, and A load control method comprising a selection circuit that selectively outputs a frequency-divided signal.