KR20100054311A - Apparatus and method of controlling overload in mobile switching system - Google Patents

Abstract

An overload control apparatus and method in a mobile switching system are provided. The overload control device in the mobile switching system according to the present invention includes a CPU overload of a call processing processor and an unprocessed IPC (Inter Processor Communication) number to detect an overload of the mobile switching system every predetermined period. An overload class determination unit for determining a class for the detected overload and a call allowance unit for determining whether to allow incoming short message service (SMS) incoming paging and voice incoming paging according to the overload level.

Description

Apparatus and method of controlling overload in mobile switching system

The present invention relates to overload control in a mobile switching system. More specifically, the mobile switching system of cellular mobile communication performs overload control by separating voice incoming paging and SMS (short message service) incoming paging according to the overload class. An overload control apparatus and method in an exchange system.

The cellular mobile communication system divides the entire service area into a plurality of base station areas and configures cells as small service areas, and the subscribers move between cells by centrally controlling these base stations with a mobile switching system. It allows you to continue the call. The call processing processor of the mobile switching system is responsible for call control and operation maintenance management functions, and includes an access switching processor (ASP), an inter-network processor (INP), a location registration processor (LRP); Location Register Processor).

The call processing processor of the switching system becomes overloaded when the CPU occupancy rate of the call processing process exceeds a predetermined threshold load rate. Under the overload condition, the processing speed of the call processing processor is reduced, the value of Busy Hour Call Attempt (BHCA), which is the maximum processing number per unit time, is reduced, and maintenance management is not possible. Therefore, the exchange system determines the overload status according to the CPU occupancy rate, determines the overload class according to the IPC (Inter Processor Communication) message usage rate, which is a means of communication between the processors, and controls the overload by limiting calls according to the overload class. .

However, this overload control method feels uncomfortable for the user by controlling irrespective of the call type, that is, distinguishing between voice and short message service (SMS).

The technical problem to be solved by the present invention is to separate both the voice incoming paging and SMS incoming paging according to the overload level in the mobile switching system to limit both voice incoming paging and SMS incoming paging if the overload rating is high, but SMS incoming if the overload rating is low The present invention provides an overload control apparatus and method in a mobile switching system that allows paging by the number of incoming paging.

The overload control device in the mobile switching system according to the present invention includes a CPU overload of a call processing processor and an unprocessed IPC (Inter Processor Communication) number to detect an overload of the mobile switching system every predetermined period. An overload class determination unit for determining a class for the detected overload and a call allowance unit for determining whether to allow incoming SMS (Short Message Service) paging and voice incoming paging according to the overload class.

When the overload occurs, when the overload occurs, the SMS incoming allowable part and the overload level that allow the incoming SMS paging by the number of paging allowed according to the overload class exceed the predetermined threshold level. It includes a voice incoming allowr that allows the incoming call as many as the number of paging allowed.

The overload control device in the mobile switching system further includes an operator input unit for receiving SMS and voice call permission criteria by the operator.

An overload control method in a mobile switching system includes a step of determining an overload class at predetermined intervals by combining CPU shares of a call processor and the number of unprocessed IPCs (Interprocess Communication), and voice incoming paging and SMS (Short) according to the overload class. Message Service) includes the step of controlling the incoming paging.

If the overload class is below a predetermined threshold level, the SMS incoming paging is allowed by the number of paging allowed according to the overload class, and when the overload level exceeds the predetermined threshold level, voice incoming paging and SMS incoming It is desirable to allow paging to be received by the number of paging allowed according to the overload class.

According to the present invention, by controlling the voice paging and SMS paging according to the overload class, if the overload rating is high, both the voice paging and SMS incoming paging is limited, but if the overload rating is low, SMS incoming paging is allowed by the number of incoming paging Thus, in the case of SMS incoming, the incoming call retry occurs based on the retry criteria of the SMS center, so that inconvenience of the user may be reduced.

DETAILED DESCRIPTION In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings which illustrate preferred embodiments of the present invention and the contents described in the drawings.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference numerals in the drawings denote like elements.

1 is a block diagram showing the configuration of an overload control device according to the present invention.

Referring to FIG. 1, the overload control apparatus 100 includes an overload detector 110, an overload grade determiner 120, and a call reception unit 130.

The overload detection unit 110 detects the overload of the mobile switching system by combining the CPU occupancy of the call processing processor and the number of unprocessed IPCs. When the call processing processor is an operation and maintenance processor (OMP), traffic and resources are detected. Overload is detected in the TRC (Traffic amp Resource Control) block. The TRC block detects overload based on CPU occupancy, regardless of the type of call process.

If the call processing processor is an Access Switching Processor (ASP), an Inter Network Processor (INP), or a Location Register Processor (LRP), Concurrent Real-time Operating, a real-time parallel processing operating system that resides on all main processors in the mobile switching system. System) and TRC block to detect overload.

In the embodiment of the present invention, the overload detection unit 110 detects whether or not the overload every predetermined period, for example, every six seconds.

The overload rating determiner 120 determines a rating for the overload detected by the overload detector 110. Overload ratings can vary from processor to processor. For example, if the processor is OMP, it can be divided into four overload classes as shown in [Table 1].

The overload detection in the TRC block is performed every 6 seconds, and it is determined that the overload is detected when the monitored CPU occupancy is equal to the condition of [Table 1] for 6 seconds. In addition, when the number of unprocessed IPC is 45% or more of the total size, it sets to overload class 1 (Minor) and detects an overload condition.

If the processor is ASP, INP and LRP, it is divided into 10 overload classes as shown in [Table 2].

Such overload ratings are shown by way of example only, and may have various numbers of overload ratings.

The incoming call acceptor 130 determines whether to allow SMS incoming and voice incoming according to the overload grade determined by the overload rating determiner 120.

The call reception unit 130 includes an SMS call reception unit 132 and a voice call reception unit 134.

When the overload occurs, the SMS incoming allow unit 132 allows incoming SMS paging by the number of allowed paging.

When the overload class exceeds a predetermined threshold level, the voice incoming allow unit 134 allows incoming voice paging by the number of allowed paging.

Table 3 below shows, as an example, incoming call acceptance criteria allowed according to the overload class. Table 3 is only shown as an example, and the number of incoming call allowances may be determined in various ways.

For example, if the base station center (BSC) has changed its overload rating from NORMAL to MAJOR, the number of incoming paging is 60 in the last 6 seconds, and the mobile station center is healthy, the number of incoming paging to allow for 6 seconds is 60 * (1-0.3) = 42.

Table 4 below shows an example of the call limit capacity mapping table according to the overload class of the MSC under normal load of the BSC.

Here, MAX means the maximum call processing capacity of the subsystem, that is, the number of calls allowed for 6 seconds.

For example, if the number of lakes allowed in the previous 6 seconds is 100 lakes and the overload grade is changed from 4 to 7, then only 85 lakes, which are reduced by 15%, are upgraded by 3 levels.

The call reception unit 130 may control voice and SMS at the same time, or may perform voice call control after performing SMS call control.

Here, as an example, the criteria for performing voice incoming control after performing SMS incoming control will be described.

If the grade is 1 to 3 (ie, the grade is MINOR), SMS incoming control is performed as shown in [Table 5].

If the grade is 4 to 6 (ie, the grade is MAJOR), SMS incoming and voice incoming control is performed as shown in Table 6.

When the grade is 7 to 10 (ie, the grade is CRITICAL), SMS incoming and voice incoming control is performed as shown in [Table 7].

The overload control device 100 further includes an operator input unit 140.

The operator input unit 140 receives the SMS and voice call acceptance criteria by the operator. The operator can arbitrarily determine the number of SMS and voice incoming paging allowances.

When the operator does not input, SMS and voice paging are controlled by the above-described operation.

2 is a flowchart illustrating an overload control method of a mobile switching system according to the present invention.

Referring to FIG. 2, when an overload occurs (step S200), an overload grade is determined (step S210). Examples of overload ratings according to the types of processors are shown in [Table 1] and [Table 2]. The determination of the overload class according to the overload detection is made every six seconds.

It is determined whether the overload grade is less than or equal to the predetermined threshold grade (step S220). If the overload level is less than the predetermined threshold level, SMS is allowed as many as the number of paging allowed (step S230).

If the overload level exceeds the predetermined threshold level, SMS and voice call are allowed as much as the number of allowed paging (step S240).

In steps S230 and S240, the number of paging allowed is shown as an example in [Table 3], which is only shown as an example and may be variously set.

In addition, SMS and voice incoming permission may be simultaneously performed, or voice incoming control may be performed after SMS incoming control. In the examples shown in Tables 5 to 7, an example is shown in which voice incoming control is performed after SMS incoming control.

As described above, optimal embodiments have been disclosed in the drawings and the specification. Although specific terms have been used herein, they are used only for the purpose of describing the present invention and are not intended to limit the scope of the invention as defined in the claims or the claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

The present invention can be used to effectively operate the system in case of overload in the mobile switching system.

1 is a block diagram showing an overload control device of a mobile switching system according to the present invention.

2 is a flowchart illustrating a method for controlling overload of a mobile switching system according to the present invention.

* Description of the symbols for the main parts of the drawings *

100: overload control unit 110: overload detection unit

120: overload class determination unit 130: incoming call allowance

140: operator input unit

Claims (5)

An overload detector which detects the overload of the mobile switching system every predetermined period by combining the CPU occupancy of the call processing processor and the number of unprocessed IPCs (Inter Processor Communication). An overload rating determiner configured to determine a rating for the overload detected by the overload detector; An overload control device in a mobile switching system, comprising: an incoming allowr for determining whether to allow incoming short message service (SMS) incoming paging and voice incoming paging according to an overload class. According to claim 1, The incoming call allowed portion, If an overload occurs, the SMS incoming allowr that permits incoming SMS paging by the number of paging allowed according to the overload class; And a voice incoming allowance unit for allowing incoming voice paging to be received by the number of paging allowed according to the overload class, when the overload class exceeds a predetermined threshold level. The method of claim 1, Overload control device in a mobile switching system, characterized in that it further comprises an operator input unit for receiving the SMS and voice call acceptance criteria by the operator. Determining an overload class at predetermined intervals by combining the CPU occupancy of the call processing processor and the number of unprocessed IPCs; And classifying and controlling voice incoming paging and SMS (short message service) paging according to the overload class. The method of claim 4, wherein the controlling comprises: If the overload class is less than or equal to the predetermined threshold level, the SMS incoming paging is allowed to be received by the number of paging allowed according to the overload class. If the overload class exceeds the predetermined threshold level, the voice incoming paging and the SMS incoming paging are determined according to the overload class. An overload control method in a mobile switching system, characterized in that incoming calls are allowed as many as the allowed paging number.

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