KR100210797B1 - Overload control method of vlr in mobile cellular communication - Google Patents

Abstract

The present invention relates to a method of controlling the overload of the VLR in the mobile communication switch for effectively controlling the overload of the VLR according to the location registration of the mobile station. Calculate a rating, calculate a service limit according to the calculated overload rating, convert the calculated service limit into a time interval per service, and then add the service interval to the converted time interval if subscriber registration is required. Control the subscriber's location registration, and if the VLR is overloaded, calculate the overload rating based on the VLR's currently registered subscription, calculate the service limit according to the calculated overload rating, and calculate the calculated service limit Is converted into a time interval per service, and when the subscriber's location registration is required, the converted By so controlling the position of the registered subscriber according to the service per time interval, it is possible to always maintain the amount of location registration service of a certain level it is possible to improve the quality of service of a wireless communication system including the mobile communication exchange system.

Description

Overload Control Method of Subscriber Location Register in Mobile Switching System

The present invention provides a switch for effectively controlling an overload of a subscriber location register (hereinafter, abbreviated as 'VLR') according to a location registration of a mobile terminal in a switch of a mobile communication exchange system including personal cellular communication. An overload control method of a VLR in a communication exchange is provided.

A personal mobile communication system or a mobile communication switching system is a mobile terminal station that moves between an unspecified area or a mobile station and a stationary station that can communicate with each other at any time, anywhere, and with anyone by using radio waves in a space. A base station that transmits and receives messages with a station and manages radio resources, and a control station that performs various functions necessary for radio call processing such as handoff while controlling and managing a plurality of base stations, It is composed of a switch that performs all the functions necessary for call processing and data exchange of a mobile communication system while performing switching.

One of the most important and great features of the communication system configured as described above is to guarantee the mobility of the mobile station, and the location registration and handoff techniques are required for the mobility of the subscriber.

The location registration is a processing procedure for notifying the base station of various characteristics such as location information and its status in a personal communication network or a mobile communication network where the mobile terminal station is located, and referred to as a home location register (HLR). Abbreviated).

In addition, the switch is composed of a plurality of subsystems and processors, and in particular, a location register processor (hereinafter referred to as LRP) is assigned to a mobile terminal station in a corresponding area of its exchange. Manages the VLR to store location information about

On the other hand, in the mobile communication switch, there are two major overloads associated with the VLR. The first is the overload of the LRP that manages the VLR, and the second is the overload caused by exceeding the location registration capacity of the VLR itself. have.

In controlling the overload of the LRP and the overload of the VLR, conventionally, only the overload of the LRP is controlled by detecting the overload state of the LRP.

However, in the conventional overload control method, if there are many subscribers registered in the VLR, and the LRP is not overloaded, the LLR continues to accept the location registration request of the subscriber. Not only does not provide a proper and there is a problem that can not effectively control the LRP overload condition.

Accordingly, the present invention has been made to solve the above problems, the object of the present invention is to detect the overload of the LRP and the overload of the VLR, respectively, when the LRP is overloaded state to control the location registration of the subscriber according to the current overload state If the VLR is overloaded, the location registration service can be maintained at a certain level by controlling the location registration of each subscriber according to the number of subscribers currently accommodated. Accordingly, the service quality of the personal mobile communication or mobile communication switching system can be maintained. An object of the present invention is to provide an overload control method of a VLR in a mobile communication switch.

In the overload control method of the present invention for achieving the above object, if an overload condition is detected in the LRP, the overload rating according to the detected overload condition is calculated, and after calculating the limit value of the service according to the calculated overload rating, By calculating the time intervals per service based on the calculated thresholds, the subscriber's location registration is controlled according to the calculated time intervals, and when an overload condition is detected from the VLR, the overload rating due to the current number of subscribers is calculated. And after calculating the service limit value according to the calculated overload level, the service time interval based on the calculated limit value is calculated again to control the location registration of the subscriber according to the calculated time interval. do.

1 is a simplified block diagram of a mobile communication switch for performing an overload control method of a subscriber location register according to the present invention;

2 is an overload control flowchart of a subscriber location register in accordance with the present invention.

* Explanation of symbols for main parts of the drawings

10: ASP 11: Mobility Management

12: ASP overload control 20: LRP

21: OS unit 22: location registration processing unit

23: LRP overload control unit 30: VLR

Hereinafter, with reference to the accompanying drawings will be described in detail the overload control method of the VLR of the present invention.

1 is a simplified block diagram of a mobile communication switch for performing an overload control method of a subscriber location register according to an embodiment of the present invention. The subscriber switching processor performs various procedures for performing subscriber location registration of a mobile station. Processor (hereinafter, abbreviated as 'ASP') 10 includes a mobility management unit 11 for controlling location registration of a mobile station subscriber and an ASP overload control unit 12 for converting service limit values to time intervals per service when an overload occurs. The LRP 20, which controls the location registration of the subscriber, includes an OS unit 21, which is an operating system for executing subscriber location registration and various programs, and a location registration processing unit for processing location registration of the subscriber ( 22) and calculate the overload rating based on the current subscription amount compared to the VLR capacity when the VLR is overloaded, and the service limit value according to the calculated overload rating is calculated. LRP is composed of an overload control 23 for.

And, if the location registration request in the mobility management unit 11 in the ASP (10) managed by the LRP 20, the VLR (30) for storing the location information of the subscriber and control the location registration to be included. Consists of.

The overload control method of the VLR of the present invention applied to the exchange configured as described above will be described with reference to FIG.

Here, the present invention determines and detects the overload of the LRP and the overload of the VLR, respectively, and controls them separately. First, it is determined whether the overload condition is detected in the LRP or the overload condition in the VLR (S1).

If an overload condition is detected in the LRP from the step S1, the overload state of the LRP 20 is detected by the OS unit 21 through the CPU occupancy rate and the IPC queue length.

When the OS unit 21 detects the overload state of the LRP as described above, the OS unit 21 transmits the LRP overload message to the LRP overload control unit 23.

Then, the LRP overload control unit 23 that receives the overload message of the LRP calculates the overload grade by using the number of location registration services currently performed, obtains a service limit value according to the calculated overload grade, and then stores the ASP in the ASP 10. It transmits to the overload control part 12 (S2).

Then, the ASP overload control unit 12 having received the service limit value converts the service limit value into a time interval per service and transmits the value to the mobility management unit 11 (S3).

Accordingly, the mobility management unit 11 first determines whether there is a location registration request from the subscriber (S4), and if there is a location registration request, referring to the time interval per service converted by the ASP overload controller 12. To properly control the location registration of the subscriber (S5).

On the other hand, if the location registration of the subscriber is requested to the VLR more than the capacity, and if the overload condition is detected in the VLR from the step (S1) (S6), the location registration processing unit 22 of the LRP 20 in the LRP overload control unit ( 23) send a VLR over capacity message.

Then, the LRP overload control unit 23 calculates the overload grade by the current subscription amount relative to the VLR capacity (S7), calculates the service limit value according to the calculated overload grade from the number of location registration services currently performed, and then calculates this value. It transmits to ASP overload control part 12 in ASP 10 (S8).

In addition, the ASP overload control unit 12 having received the service limit value converts the service limit value into a time interval per service and transmits it to the mobility management unit 11 (S9). Accordingly, the mobility management unit 11 registers a location from the subscriber. If there is a location registration request by checking whether there is a request (S4), the location registration of the subscriber is appropriately controlled according to the time interval per service converted by the ASP overload controller 12 (S5).

As described above, the present invention controls the subscriber's location registration at an appropriate time interval per service according to the overload state of the LRP, or even if the location registration is required beyond the capacity that the VLR can accommodate, Accordingly, by controlling the subscriber's location registration at an appropriate time interval per service, it is possible to maintain a certain level of location registration service at all times, thereby improving the quality of service of the mobile communication system including the personal mobile communication system.

Claims (1)

In the overload control method of subscriber location register in personal mobile communication or mobile communication switch, A first step of detecting whether the location registration processor (LRP) is overloaded or the subscriber location register (VLR) is overloaded, and if the LRP is overloaded in the first step, the number of location registration services currently performed is overloaded. And a third step of calculating a service limit value according to the overload class calculated in the second step, and a fourth step of converting the service limit value calculated in the third step into a time interval per service. A fifth step of controlling the location registration of the subscriber according to the time interval per service converted in the fourth step when the location registration of the subscriber is required; and the currently registered subscription of the VLR if the VLR is overloaded in the first step. A sixth step of calculating an overload rating based on the number of steps; a seventh step of calculating a service limit value according to the overload rating calculated in the sixth step; An eighth step of converting the calculated service limit value into a time interval per service, and a ninth step of controlling the location registration of the subscriber according to the time-per-service interval converted in the eighth step if the location registration of the subscriber is required An overload control method of a subscriber location register in a mobile communication switch, characterized in that.