KR100277173B1 - Overload Control Method of BR in Mobile Switching System - Google Patents

Abstract

The present invention relates to a method for controlling overload of a VLR (Visitor Location Register) in a mobile switching system. In particular, the VLR selectively limits the provision of services according to the overload level of the processor and whether or not it is externally interworked. The present invention relates to an overload control method of a VLR in a mobile switching system configured to perform an overload control function by setting a processor in an overload state when resources are insufficient.

Conventionally, there is a problem in that the VLR of the mobile switching system detects only whether the processor is overloaded and restricts the MAP protocol requests flowing into the processor, and provides a service to a subscriber when a resource shortage for managing the processor occurs. There is a problem that is continuously stopped.

The present invention manages a processor for each overload class in a VLR of a mobile switching system, selectively restricts a MAP protocol request according to the occurrence frequency and resource occupancy of external interworking in response to the overload class of the corresponding processor, and simultaneously waits for the corresponding MAP operation. It saves time quickly and recovers operational resources, and if the VLR lacks resources for processor management, it sets the processor to overload and performs the same overload control function, thus preventing continuous service interruption to subscribers. At the same time, the stability of the system can be maintained.

Description

Overload Control Method of BR in Mobile Switching System

The present invention relates to a method of controlling an overload of a VLR in a mobile switching system. In particular, the VLR selectively limits the provision of a service according to the overload level of the processor and whether the external interworking is performed. The overload control method of the VLR in the mobile switching system to set the overload state to perform the overload control function.

In general, a visitor location register in addition to a home location register (HLR) as a location register for retrieving information for processing a call to or from a visiting subscriber in a mobile switching system of a mobile communication network. Registrar), and if the mobile switching system is distributed in each region, the VLR performs the auto registration function to transfer the mutual service right when the specific subscriber moves from the region to which the subscriber is subscribed. Subscriber information can be transmitted and received to provide a mobile communication service without regional restrictions. That is, it manages information about the current location of the visiting subscribers who are switching service rights.

At this time, the VLR is composed of a plurality of application processors to provide a mobile communication service to the visitor, the mobile switching system checks whether the overload using the load of each processor, that is, the central processing unit occupancy, In case of an overload, if there is a service request that needs to be processed by the processor from the subscriber, it restricts the transmission of the mobile application part (MAP) protocol request signal of the processor.

In other words, the call processing block of the conventional mobile switching system receives a new service request that can be serviced according to whether the processor performing an operation for the service request from the mobile subscriber is overloaded or receives a MAP protocol request signal according to the service request. Is sent to the corresponding processor, and the corresponding VLR provides the service for the visited subscriber, that is, the call origination / reception and various additional services according to the MAP protocol request signal from the call processing block, and the maintenance block periodically Inquiry of the CPU share of each processor to the call processing block to inform the call processing block whether the processor is overloaded. In this case, the overload control operation of the mobile switching system will be described with reference to FIG. same.

First, if the central processing unit share for each processor is inquired to the VLR at each predetermined share inquiry period in the corresponding maintenance block (step S11), the central processing unit share of each processor is returned to the corresponding maintenance block in response to the corresponding VLR. To the side.

Accordingly, the maintenance block receives the central processing unit occupancy rate of each processor applied from the VLR (step S12), and confirms whether the central processing unit occupancy is smaller than the predetermined threshold occupancy rate (step S13).

If the processor occupancy of the processor is less than the predetermined threshold occupancy, that is, the processor is in a normal load state, the maintenance block notifies the call processing block that the processor is in a normal load state. If the processor occupancy of the processor is not less than the predetermined threshold occupancy, that is, the processor is overloaded, the maintenance block notifies the call processing block that the processor is overloaded and returns to step S11. For each share inquiry cycle, the central processing unit share for each processor is inquired to the VLR side.

At this time, if there is a service request from the visiting subscriber, the call processing block checks whether the service request is a service request to be processed by a processor that is currently in a normal load state (step S14), and needs to process it in the processor which is in a normal load state. If it is a service request, it sends a MAP protocol request signal to the corresponding processor of the VLR (step S15), and if it is not a service request to be processed by a processor under normal load, that is, a service request to be processed by an overloaded processor, the VLR. After stopping the provision of the service by limiting the transmission of the MAP protocol request signal to the side (step S16), the flow returns to step S11 to query the central processing unit occupancy rate for each processor to the VLR for each occupancy inquiry period.

The VLR of the conventional mobile switching system operates in conjunction with another switching system through the No.7 signal network. If the No.7 signal network is unstable and message loss occurs continuously, the VLR of the mobile switching system is If the VLR runs out of resources in the memory area (data, stack, etc.) that is required to manage the processor of the operating system (data, stack, etc.), even if it is not overloaded, the allocation of resources of the available memory area The subscriber service in the mobile switching system is not only possible, and there is a disadvantage in that the service interruption state occurs continuously.

As described above, conventionally, there is a problem in that the VLR of the mobile switching system detects only whether the processor is overloaded and restricts the MAP protocol requests flowing into the processor in a batch, and when resource shortage for managing the processor occurs. There is a problem that the service to the subscriber is continuously stopped.

The present invention is to solve the problems as described above, the purpose is to manage the processor by the overload class in the VLR of the mobile switching system, the MAP according to the occurrence frequency and resource occupancy of the external interworking corresponding to the overload class of the processor In addition to selectively restricting protocol requests, the MAP operation wait time can be shortened to quickly recover operational resources.

Another object of the present invention is to set the processor overload when the resource for the processor management in the corresponding VLR to selectively limit the MAP protocol request in accordance with the frequency and resource occupancy of the external interworking and the corresponding MAP operation waiting time It is to shorten the operation and to recover the operation resources quickly.

In order to achieve the above object, there is provided a method of controlling an overload of a VLR in a mobile switching system, the method comprising: receiving and receiving a MAP protocol request signal while determining and managing an overload level of each processor; Checking whether an external interworking necessity of the processor that needs to process the corresponding MAP protocol request signal and whether an overload condition is present; Selectively restricting a MAP protocol request signal flowing into a corresponding processor in response to an overload level of the processor; It includes a process of providing a service by processing a normal MAP protocol that is not limited by shortening the MAP operation waiting time of the processor.

1 is a flowchart illustrating an operation of an overload control of a conventional mobile switching system.

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

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In the present invention, the call processing block, the maintenance block, and the VLR of the mobile switching system periodically check the central processing unit share of each processor to the VLR side to check whether the corresponding processor is overloaded, as in the above-described conventional overload control operation. Simultaneously additionally manages the class of the overload, with reference to Figure 2 attached to the overload control operation of the VLR in the mobile switching system as follows.

First, the VLR of the mobile switching system checks the overload using the central processor share of each processor inquired, and if an overload occurs in the processor, determines and manages the overload class according to the central processor share. Step S21).

At this time, when the VLR receives the MAP protocol request signal according to the service request of the visited subscriber from the call processing block (step S22), an external interworking, i.e., another system in the mobile communication network (HLR, Check whether or not interworking with MSC, VLR, etc. is necessary (step S23).

If the external interworking is necessary, the VLR checks whether the processor that needs to process the MAP protocol request signal is overloaded (step S24), and if the processor is overloaded, the external interworking corresponds to the overload class of the corresponding processor. To determine whether the service is provided, that is, whether the service can be provided according to the frequency of occurrence and resource occupancy rate (step S25). For example, the overload class of the processor is classified into three classes (Minor, Major, Critical). In this case, if the corresponding overload level is Major, the service request with high frequency and resource occupancy of both external interworking is limited by about 50%, and any of the frequency and resource occupancy of the external interlocking is restricted. For only one high service request, the service provision is limited by about 30%. Help to make this service available for all service requests low Resource occupancy limit of about 10%.

On the other hand, if it is determined that the service is provided according to the overload class of the processor in step S25, and the service is not available, the service is restricted and the service is not provided, and the process returns to step S22 to request a new MAP protocol. After receiving the signal, if the service is available, set the MAP operation waiting time for each processor in the corresponding VLR to shorten the operation (step S26), and then process the corresponding MAP protocol as normal. After providing the service according to the subscriber's service request (step S27), the process returns to step S22 to receive a new MAP protocol request signal, for example, when requesting a MAP operation from the VLR (A) to another system. When the continuous MAP operation request is generated from the system (B) to the third system (C), the system (B). Shorten and operate the timer value At driven by the VLR in conjunction with the timer value Bt driven in the SLR. If the drive timer value At in the normal load is "Bt + 6", the drive in the case of overload Reduce the timer value (At) to "Bt + 1". In other words, after requesting the MAP protocol processing from the VLR to another system in succession, MAP operation waiting time until a response is shortened and resource recovery of the memory area is performed quickly.

However, if the external linkage is not necessary in step S23 or if the processor is not overloaded in step S24, the VLR indicates that the resource allocation of the available memory area required for processor management from the operating system (OS) is insufficient. Check whether the message is delivered, i.e., if there is a shortage of resources (step S28), and if it is not the shortage of resources, the MAP protocol is processed normally to provide a service according to the service request of the visited subscriber (step S30). If the resource is in a low state, the processor is set to an overload state (step S29), and then the process returns to step S22 to receive a new MAP protocol request signal, thereby processing MAP protocol request signals received thereafter. It is not unconditional to decide whether to provide the service according to the overload level. And it performs the following processing operation.

As described above, in the present invention, the central processing unit occupancy of the processor is managed at a predetermined overload level according to a predetermined threshold occupancy rate, and the occurrence frequency and resource occupancy rate of the external linkage are applied to the MAP protocol request signal flowing into the corresponding processor corresponding to the overload level. By selectively limiting and simultaneously reducing the operation time of the MAP operation by a predetermined time for the rapid recovery of the operating resources used during the MAP operation according to the MAP protocol request by recovering the operating resources of the memory area quickly, The processor overload of the VLR prevents continuous service interruptions for visiting subscribers while maintaining system stability.

In addition, when a resource shortage value is provided from an operating system as a resource allocation shortage of the processor as well as the CPU occupancy of the processor occurs, that is, the processor is not detected as an overload on the CPU occupancy. If the resource shortage condition occurs without performing the overload control function, the VLR sets the processor to the overload state to perform the overload control function as described above. This prevents downtime and maintains system stability.

As described above, the present invention manages a processor for each overload class in the VLR of the mobile switching system, and selectively restricts the MAP protocol request according to the frequency and resource occupancy rate of external interworking in response to the overload class of the corresponding processor. By reducing the operation time of the MAP operation, the operating resources are quickly recovered, and if the VLR lacks resources for managing the processor, the processor is set to overload to perform the same overload control function, thereby continuing the service interruption to the subscriber. This prevents the condition and maintains the stability of the system.

Claims (3)

In the overload control method of the VLR in the mobile switching system, Receiving a MAP protocol request signal while determining and managing an overload level of each processor; Checking whether an external interworking necessity of the processor that needs to process the corresponding MAP protocol request signal and whether an overload condition is present; Selectively restricting a MAP protocol request signal flowing into a corresponding processor in response to an overload level of the processor; The method of controlling the overload of the VLR in a mobile switching system comprising the step of shortening and setting the MAP operation waiting time of the processor to provide a service by normally processing the corresponding MAP protocol. The method of claim 1, In the process of confirming whether the external interworking of the processor is necessary and whether the overload state is necessary, if the external interworking of the processor is required and the overload state is provided, the service may be provided according to the occurrence frequency and resource occupancy of the external interworking according to the overload class of the processor. Checking whether it is possible; Setting to shorten the MAP operation waiting time of the processor; The method for overload control of a VLR in a mobile switching system further comprising the step of providing a service by normal processing during the MAP operation waiting time setting the MAP protocol request signal capable of providing the service. The method of claim 1, In the process of checking whether the external interworking of the processor is necessary and whether it is overloaded, a message indicating that resource allocation for managing the processor provided by the operating system is insufficient when the external interworking of the processor is not necessary or when the processor is not overloaded. If so, setting the processor to an overloaded state; And returning to the process of receiving the MAP protocol request signal to perform a repetitive operation.