KR100405601B1 - Method for call information memory management in MSC - Google Patents

Abstract

According to the present invention, an error check is periodically performed on a call information storage area that stores information related to each call, thereby forcibly releasing an array element in which an error is detected, thereby saving call information of an MSC. It relates to a zone management method.

Conventionally, due to partial loading of the call processing unit, abort during execution, or execution error of the call processing unit itself, it is often impossible to cancel the allocated array elements properly. There is a problem in that the performance of the system is degraded by causing a runaway call or a failure of a paging request.

The present invention executes an error check on a call information storage area that stores call related information for each call and performs a forced cancellation on an array element where an error is detected, thereby causing a call runaway by encroachment of system resources. The phenomenon can be prevented. In addition, by notifying the operator of various information stored in the array element in which the error occurred, it can be used as useful data for analyzing the cause of the error.

Description

MS for call information storage management method {Method for call information memory management in MSC}

The present invention relates to a method of managing a call information storage area of the MSC, and in particular, by periodically performing error checking on a call information storage area storing information related to each call, thereby forcibly canceling an array element where an error is detected. The present invention relates to a method for managing call information storage areas of an MSC that enables efficient use of resources.

In general, a mobile switching center (MSC) is an automatic system that configures an access point for user traffic between a mobile communication network and a general telephone network or another MSC in the same or different mobile communication networks. And a relay call processing unit for processing a call relayed to another MSC.

The mobile subscriber call processing unit is divided into an outgoing call processing unit and an incoming call processing unit to perform call connection control. The originating call processing unit checks an error on an outgoing request message of a subscriber received from a wireless section, and then processes outgoing call. Allocate a call register for storing information necessary for execution, store various call related information including contents of an outgoing request message received in a wireless section in the assigned call register, and create a child process for outgoing call processing. It requests radio resource allocation to the base station controller (BSC), receives outgoing subscriber information through the VLR (Visitor Location Register), determines whether to proceed with outgoing call processing, and stores relevant subscriber information in the call register. . After the final call is completed through the number translation and the incoming routing process for the call connection, the terminal transitions to the busy state, and all resources for the call when the call is terminated by the calling subscriber during normal termination or call setup. To recover the call, the call register resources allocated to store the information needed to perform outgoing call processing are also released.

On the other hand, the incoming call processor makes a call attempt for the called subscriber by number translation and routing of the outgoing call processor. When the outgoing call processor receives the location information of the called subscriber from the VLR and requests the incoming paging to the paging controller, In addition, the paging control unit transmits the paging control unit including various information related to the paging in the message requesting to perform the incoming paging to the incoming call processor.

As described above, the incoming call processor that receives the incoming paging request message including the paging related information from the paging control unit allocates a paging information storage area to store various information for incoming paging until a paging response or timeout. And the incoming paging is attempted.

As described above, paging may be successful because the called subscriber responds normally as a result of the attempted paging of the called subscriber, or if the paging succeeds or fails, the paging information storage area that has been allocated is released. .

Here, if paging is successful, a child process for receiving call processing is created, and a call register for storing various call related information required for connection of the incoming call is allocated.

When the incoming call ends, various resources including the call register are terminated.

As described above, the originating and terminating call processing unit maintains information related to the call, such as the calling and terminating numbers, the switch information, the related process ID, and the like while performing functions for connection and control of the call. To store various information about each call, it is declared as an array of structures based on the maximum number of calls that can be processed by the call processing unit. Whenever an outgoing or incoming call is attempted, one array element is allocated to access the array element allocated to each call as an index value of the array, and is terminated after the call ends.

The paging information storage area stores various paging related information included in the incoming paging request message received from the paging controller, and is declared in an array structure like a call register. When a paging response is received as a result of the paging attempt, the array elements of the allocated paging information storage area are canceled, and even if the paging response fails, the array elements of the paging information storage area are cancelled.

As described above, the allocation and removal of call registers or paging information storage areas must be performed correctly in accordance with the actual attempts and terminations of the call, due to partial loading of the call processor, abort during execution, or execution error of the call processor itself. As a result, the cancellation of the allocated area is often not performed properly.

Therefore, since the number of assignable array elements is reduced and the number of calls that can be processed is reduced, there is a problem in that the long-term operation causes a congestion of a call or a failure of a paging request and degrades the performance of the system.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and periodically executes an error check on a call information storage area that stores call related information for each call, thereby forcibly canceling an array element where an error is detected. Accordingly, the object of the present invention is to provide a method for managing a call information storage area of the MSC, which can prevent a call congestion phenomenon caused by the encroachment of system resources.

Another object of the present invention is to notify the operator of error data information, so that it can be used as useful data for analyzing the cause of the error.

1 is a diagram showing the configuration of an MSC to which the call information storage area management method according to the present invention is applied;

2 is a diagram showing the structure of a call register applied to the present invention.

3 is a diagram showing the structure of a paging information storage area to which the present invention is applied;

4 is a flowchart for explaining a method for managing a call information storage area of an MSC according to the present invention;

*** Explanation of symbols for the main parts of the drawing ***

10. call processing unit, 13. originating call processing unit,

13a, 15a. Call register, 15. incoming call processing,

15b. Paging information storage area, 20. Relay call processing unit

According to another aspect of the present invention, there is provided a method of managing a call information storage area of an MSC, including: initializing a call register and a paging information storage area when a call processor is driven; Driving an error checking timer to receive an error checking performing signal from an OS; Searching each array element included in the call register according to the error checking execution signal received from the OS and checking whether the array element is allocated; If it is determined that an array element is assigned to the call register, determining whether there is a process for call processing managed by being assigned the array element; If there is no process corresponding to the array element as a result of the determination, forcibly canceling the array element by determining that an error that the termination of the array element has not been made occurs; A paging information storage area error checking step of checking an error of each array element included in the paging information storage area according to the error checking execution signal received from the OS and forcibly canceling the array element where an error is detected; It is made to include.

The call register error checking process may include: searching each array element included in the call register to determine whether the corresponding array element is allocated; If the corresponding arrangement element is allocated as a result of the determination, determining whether there is a process in charge of processing a call managed by receiving the arrangement element; If it is determined that the process does not exist, it is determined that an error in which the corresponding arrangement element has not been canceled has occurred, and the call related information stored in the arrangement element is output to an operator terminal. Comprising the step of forcibly canceling.

The paging information storage area error checking process may include: searching each array element included in the paging information storage area to determine whether the corresponding arrangement element is allocated; Increasing the value of the check field belonging to the array element when the array element is allocated as a result of the determination, and determining whether the check field value is greater than at least two; If it is determined that the value of the check field is greater than at least 2, it is determined that an error that the termination of the corresponding arrangement element is not performed occurs, and outputs paging related information stored in the arrangement element to the operator terminal. And forcibly canceling the corresponding array element.

Hereinafter, a method of managing a call information storage area of an MSC according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a road showing an MSC to which a call information storage area management method according to the present invention is applied, a relay call processing unit processing a call relayed to a different MSC from a mobile subscriber call processing unit 10 for processing a call of a mobile subscriber; 20 and the like, the mobile subscriber call processing unit 10 is divided into the outgoing call processing unit 13 and the incoming call processing unit 15 to control the connection of the call.

In such a configuration, the outgoing call processing unit 13 and the incoming call processing unit 15 are each provided with call registers 13a and 15a for storing information related to the call. The call registers 13a and 15a are shown in FIG. As shown in Fig. 2, a plurality of array elements are declared based on the maximum number of calls that can be processed by each call processing unit 13 and 15, and each array element is used to indicate the allocation and release status of the array elements. And a flag storage area, and an information storage area for storing various information related to the call.

The incoming call processor 15 includes a paging information storage area 15b for storing paging related information. The paging information storage area 15b is the maximum number of calls that the incoming call processor 15 can process. Declared as a number of array elements, each of which has a usage flag storage area indicating the allocation and revocation status of the array element, a check field used to determine if an error occurred with the array element, It consists of an information storage area for storing various information related to paging.

4 is a flowchart for explaining a method for managing a call information storage area of an MSC according to the present invention.

First, call registers 13a and 15a, which are call information storage areas for storing call-related information for each call so as not to be influenced by an abnormal state before driving when the call processing unit 10 is initially driven, The paging information storage area 15b is initialized (S10). Therefore, the use flags (usage_flag) provided in the call registers 13a and 15a and the paging information storage area 15b are all initialized to 0 (False), and check fields for each array element of the paging information storage area 15b. 0 is initialized.

In the process S10, the use flag (usage_flag) is provided for each array element of the call information storage area and indicates a state of allocation and cancellation of each array element. If the array element is allocated, the use flag of the array element ( usage_flag) is set to 1 (True). If the array element is in the revoked state, the usage flag (usage_flag) of the array element is set to 0 (False).

Thereafter, the error checking timer is driven to receive a signal from the operating system (OS) for performing error checking on the call information storage area at predetermined time intervals (S12).

If the error check timer for receiving an error check execution signal from the OS is driven in step S12, an error check function for the allocation and termination state of the call information storage area is performed periodically.

Subsequently, when the error check execution signal for the call information storage area is received from the OS by the error check timer driven in step S12, the array elements of the call registers 13a and 15a are sequentially searched for the corresponding array elements. It is determined whether the use flag is set to 1, that is, whether the corresponding array element is allocated (S14, S16).

When the use flag of the array element is set to 1 as a result of the determination in step S16, the call process (send / receive) of the call managed by being assigned and using the array element is processed. A process identification (PID) of a responsible process is found, and an OS primitive is called to determine whether a corresponding process exists using the found PID (S18).

Thereafter, it is determined whether there is a process in charge of processing the call based on a result value of calling the OS primitive to the OS in step S18 (S20).

In step S18, the call processing unit 10 determines whether a process exists with an OS that knows whether a process exists to determine whether there is a process for call processing managed by being assigned and used with an array element. When calling the OS primitive, if the call result value is True, it is determined that the process exists. If the call result value is False, it is determined that the process does not exist.

As a result of the determination of step S20, if the process does not exist, an error in which the corresponding array element of the call register has not been canceled has occurred, and thus, various information stored in the array element where the error is detected ( The array index value, the calling number, the called number, the calling PID, the called PID, the current call processing step, the switch information, the type of service in progress, etc.) are output to the operator terminal, and the corresponding array element is forcibly canceled (S22, S24).

Meanwhile, the call processing unit 10 that receives the error check execution signal for the call information storage area from the OS by the error check timer in step S14 performs an error check on the call registers 13a and 15a and simultaneously paging information. Error checking is also performed on the storage area 15b. The array elements of the paging information storage area 15b are sequentially searched to determine whether the usage flag of the array element is set to 1, that is, the array element is allocated. It is determined whether there is (S26).

If the use flag of the array element is set to 1 as a result of the determination in step S26, the value of the check field belonging to the array element is increased by 1, and the value of the check field is greater than 2, for example. It determines (S28, S30).

As a result of the determination in step S30, when the check field value is larger than 2, it is determined that an error in which the corresponding array element is not terminated has occurred, and various information stored in the array element where the error is detected (service option , Transmission type, paging request time and current detection time) are outputted to the operator terminal, and the corresponding array element is forcibly canceled (S32 and S34).

The reason why it is determined that an error occurs in the array element when the value of the check field belonging to the array element in step S30 is greater than 2 is that the check field value is increased every time error checking is performed at a predetermined time interval. Considering that the maximum paging time from the first paging request to the failure of the second paging does not exceed 1 minute, if the check field value is greater than 2, the array element allocated at the paging request is longer than a certain time. This is because it is enough to judge that it remains without being terminated.

The call information storage area management method of the MSC of the present invention is not limited to the above-described embodiments, and can be modified in various ways within the scope of the technical idea of the present invention.

According to the method of managing a call information storage area of the MSC of the present invention as described above, error checking for the call information storage area for storing call-related information for each call is performed periodically to the array element where the error is detected. By compulsory cancellation, the congestion of system resources can be prevented. And, by informing the operator of various information stored in the array element in which the error occurred, there is an effect that can be used as useful data for analyzing the cause of the error.

Claims (6)

Initializing a call register and a paging information storage area when the call processing unit is driven; Driving an error checking timer to receive an error checking performing signal from the OS; Searching each array element included in the call register according to the error checking execution signal received from the OS and checking whether the array element is allocated; If it is determined that an array element is assigned to the call register, determining whether there is a process for call processing managed by being assigned the array element; If there is no process corresponding to the array element as a result of the determination, forcibly canceling the array element by determining that an error that the termination of the array element has not been made occurs; A paging information storage area error checking step of checking an error of each array element included in the paging information storage area according to the error checking execution signal received from the OS and forcibly canceling the array element where an error is detected; MS call information storage area management method comprising a. The method of claim 1, And if the process corresponding to the arrangement element does not exist, outputting call related information stored in the arrangement element to an operator terminal. The method of claim 1, wherein whether the process exists, MS call information storage area management method characterized in that it is determined based on the result value of calling the OS primitive to determine the existence of the process to the OS that knows the existence of the process. The method of claim 2, wherein the call-related information, MS call information storage area management method comprising the call number, called number, outgoing PID, incoming PID, current call processing step, switch information, service type in progress. The method of claim 1, wherein the checking of the paging information storage area error comprises: Searching each array element included in the paging information storage area to determine whether a corresponding array element is allocated; Increasing the value of the check field belonging to the array element when the array element is allocated as a result of the determination, and determining whether the check field value is greater than at least two; If it is determined that the value of the check field is greater than at least 2, it is determined that an error that the termination of the corresponding arrangement element is not performed occurs, and outputs paging related information stored in the arrangement element to the operator terminal. And forcibly canceling the corresponding arrangement element. The method of claim 5, wherein the paging-related information, MS call information storage area management method comprising the service option, origination type, paging request time and the current detection time.