KR20110075098A - Overload controlling method according to termination type and mobile switch center server - Google Patents

Abstract

PURPOSE: An overload control method and mobile switching server according to the type of a terminal are provided to control the overload of a mobile switching server by a terminal. CONSTITUTION: A message transceiving unit(112) receives an overload control message. The message transceiving unit transceives an add request message for the control of the overload. A control unit(114) controls the overload of a media gateway call resource based on the overload control message. The control unit forms the add request message according to a management result.

Description

OVERLOAD CONTROLLING METHOD ACCORDING TO TERMINATION TYPE AND MOBILE SWITCH CENTER SERVER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the field of mobile communications, and more particularly, to a method for controlling overload according to a type (termination type) of a wireless communication resource and a mobile switch center server therefor.

Wideband Code Division Multiple Access (WCDMA) mobile communication system has been developed for the purpose of multimedia transmission as one of the third generation communication systems, and has a number of advantages that are distinguished from existing systems such as high-definition image service and fast data rate. In particular, the WCDMA Release 4 communication system is capable of transferring media stream data such as voice between other communication networks, such as an Internet Protocol (IP) network, an Asynchronous Transfer Mode (ATM) network, and / or a Time Division Multiplex (TDM) network. The media gateway (MGW) that interconnects and the MSC server (Mobile Switch Center Server; MSV) that controls the call processing of the media gateway are separate communication systems.

In MSV, it is responsible for call control. Resources related to actual call paths are managed in MGW. The MSV uses the MEGACO (media gateway control) protocol to instruct the MGW to connect / disconnect the call resource when the call is set up / released. It checks the overload status to MSV by using MEGACO message (Over Load Control) in case of overload and operates to reduce the additional request that is requested from MSV to MGW.

Since there is no separate parameter according to the resource type in the MEGACO message, overload control cannot be performed for each resource type.

The present invention provides an overload control method according to a type of wireless communication resource and a Mobile Switch Center Server therefor.

The mobile switch center server of the present invention receives an overload control message including information indicating whether a media gateway call resource is overloaded for each termination type, A message transmitting / receiving unit which transmits an add request message for controlling the overload of the media gateway call resource for each termination type; A controller configured to manage an overload of a media gateway call resource for each termination type based on the overload control message and to form the ed request message according to a management result; And a storage unit which stores information on the overload class for each termination type under the control of the controller.

In addition, the overload control method according to the termination type of the present invention comprises the steps of: a) receiving an overload control message on whether a media gateway call resource is overloaded for each termination type; b) managing overload of a media gateway call resource for each termination type based on the overload control message; And c) forming an add request message according to the management result and transmitting the message to the media gateway.

According to the present invention, overload control is possible for each termination, and faster overload control is possible when an overload occurs in the media gateway (MGW). In addition, the overload control operation can be distinguished by termination so that the overload control can be performed without affecting the termination other than the overload condition.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or constructions will not be described in detail if they obscure the subject matter of the present invention.

The Media Gateway Control (MEGACO) protocol, which is used for communication between Mobile Switch Center Server (MSV) and Media Gateway (MGW) in a Wideband Code Division Multiple Access (WCDMA) mobile communication system, is generally an overload control message. There is no parameter to describe the termination type. In the present invention, the termination type is defined in addition to the overload control message to enable faster traffic restriction and overload control according to the termination in the overload control operation between the MSV and the MGW.

1 is an exemplary view showing a command for adding a termination type added to an overload control message according to an embodiment of the present invention. Referring to FIG. 1, a command for adding a termination type includes atm_term, 3G switch, and existing network (2G, 2.5G) for defining a termination type used for a mobile to mobile local call or a mobile to mobile 3G station relay. , PSTN, ...) tdm_term for the definition of the termination type used for TDM relay lines used in interworking with exchanges, and resources in the MSC, not for mobile subscribers, but for test analog subscribers and other resources such as announcement call mixers and tones. It can include fix_term for defining the type.

The MGW divides and manages the overload grade inside each processor according to the termination type into 0 ~ 16 grades. Class 0 indicates that no overload has occurred, and when overload occurs, it is divided into 1 ~ 16 grades according to the degree of overload. Overload management conditions for each class, ie overload detection, release, and class up and down conditions, are shown below.

      (1) Overload detection and grade rise conditions

 1) Overload rating is 0

-The average load of the processor for two seconds is greater than or equal to the reference load CRI, four times in a continuous two-second cycle.

-The average load of the processor for two seconds is greater than or equal to the reference load MAJ, four times in a continuous two-second cycle.

-When the average load of the processor for 2 seconds is above the reference load MAJ and the average load for 20 seconds is above the MIN.

-If the average load of the processor for 2 seconds is above the reference load MIN and the average load for 20 seconds is above the MIN, 4 times in a continuous 2 second cycle

When the unprocessed amount of IPC, which means a signal transmitted and received between processors, is 1% or more, the number of times described above is 2, 2, 1, 2 times in order.

2) If overload is 1 ~ 5

-The average load of the processor for two seconds is greater than or equal to the reference load CRI for two consecutive two-second cycles.

-When the average load of the processor for 2 seconds is above the reference load MIN and the average load for 20 seconds is above the reference load MAJ.

If the IPC unprocessed amount is 1% or more, the number of times mentioned above is 1, 4 times in that order.

3) If the overload rating is 6 ~ 15

-The average load of the processor for two seconds is greater than or equal to the reference load CRI for two consecutive two-second cycles.

-When the average load of the processor for 2 seconds is above the reference load MAJ and the average load for 20 seconds is above the reference load MAJ

When the IPC unprocessed amount is 1% or more, the number of times mentioned above is 1 time and 4 times in order.

(2) Overload release and grade down conditions

1) When overload class is 1

-If the average load of the processor for 60 seconds is less than the reference load MIN 30 times in a 2 second cycle

2) If overload rating is 2 ~ 16

-4 consecutive detections every 2 seconds when the average load of the processor for 60 seconds is below the reference load MIN and the average load for 20 seconds is below the reference load MIN

-If the average load for 60 seconds of the processor is less than 50% of the reference load MIN, two consecutive detections are performed every 2 seconds.

In the overload management condition, for example, MIN, CRI, and MAJ, which represent a reference load, may be set to 85%, 90%, and 95% of the maximum load rate of the CPU, respectively. In addition, the processor limits the maximum load rate to 95% of the electric rating compared to the previous grade when the overload grade is increased by one grade. For example, suppose you want a 100% load rate on a processor at class 0, where there is no overload, and you limit the processor's maximum load rate to 95% for a class 1 overload, and a processor at class 2 Limits the maximum load rate to 95% * 95% = 90.25%, and limits the maximum load rate of the processor to 95% * 95% * 95 = 85.74% in a Tier 3 situation. As such, the maximum load factor of each class is determined at 95% of the previous class, so the final class, class 16, limits the processor's maximum load rate to 44.01% (95% ^ 16).

2 is an exemplary view showing a message transmitted and received between the MSV and MGW according to an embodiment of the present invention.

When the call occurs, the MSV 110 transmits an add request message for requesting possession of a call resource to the MGW 120 (S110). The MGW 120 receives an Ed request message and sets up the occupation for the corresponding resource. Reply with an add reply message (S120).

When each processor of the MGW 120 manages an overload as described above, when an Ed request message is received from the MSV 110 and exceeds a maximum load rate of the corresponding class, the processor occupies the MSV 110 for the resource. An Add Reject message indicating that it is impossible is transmitted (S120), and the termination type managed by the corresponding processor is transmitted in the overload control message (S130).

The MSV 110 manages the overload grade for each termination type of EPH / TDM / FIX of the MGW 120 and performs the overload control function only for the termination type in which the overload has occurred.

3 is a block diagram showing the configuration of the MSV 110 in accordance with an embodiment of the present invention. The MSV 110 includes a message transceiver 112, a controller 114, and a storage 116. The MSV 110 manages the overload grade for each termination type internally based on the overload control message received from the MGW 120.

Referring to FIG. 3, the message transceiver 112 receives various messages such as an overload control message received from the MGW 120, and transmits a message for controlling an overload for each termination type of the MGW 120.

The controller 114 analyzes the overload control message received through the message transceiver 112 and controls the overload for each termination type. The overload class for each termination of the MSV 110 is classified into 0 to 255 steps. Information regarding the overload rating according to the termination type may be stored in the storage unit 116. When the overload control message is received from the MGW 120 with respect to the termination, the controller 114 raises the overload level of the termination type by one step. The controller 114 forms an ed request message for reducing the call resource occupancy request by 5% compared to the previous step to the MGW 120 whenever the level of the overload class is increased by one step.

In addition, when the overload rating of the specific termination type is increased by one step, the controller 114 operates an ignore timer to increase the overload rating even when the overload control message is repeatedly received during the ignore timer operation. Instead, the overload rating is raised only by an overload control message received after the operation of the ignore timer. In addition, the controller 114 operates an increment timer after the operation of the ignore timer, and when the overload control message is not received one time during the increment timer, the step of overload is lowered by one step. In addition, the ED request message is formed and transmitted to the MGW 120 through the message transceiver 112 to request that the call resource occupancy request be increased by 5% compared to the previous step. In other words, the control unit 114 may consider an excessive overload limit (increase in overload rating) or a sudden call acceptance (overload rating in step descending), resulting in another overload. The timer is activated when the overload rating falls.

The storage unit 116 stores the information on the overload class for each termination type managed by the control unit 114.

While the above methods have been described through specific embodiments, the methods may also be implemented as computer readable code on a computer readable recording medium. Computer-readable recording media include all kinds of recording devices that store data that can be read by a computer system. Examples of computer-readable recording media include ROM, RAM, CD-ROM, magnetic tape, floppy disks, optical data storage devices, and the like, which are also implemented in the form of carrier waves (for example, transmission over the Internet). Include. The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion. In addition, functional programs, codes, and code segments for implementing the above embodiments can be easily inferred by programmers in the art to which the present invention belongs.

In addition, while the present invention has been described in connection with some embodiments, it is to be understood that various modifications and changes can be made without departing from the spirit and scope of the invention as will be understood by those skilled in the art. You will need to know It is also contemplated that such variations and modifications are within the scope of the claims appended hereto.

1 is an exemplary view showing a command for adding a termination type added to an overload control message according to an embodiment of the present invention.

2 is an exemplary view showing a message transmitted and received between the MSV and MGW according to an embodiment of the present invention.

3 is a block diagram showing a configuration of an MSV according to an embodiment of the present invention.

Claims (11)

As a mobile switch center server, Receiving an overload control message including information indicating whether the media gateway call resource is overloaded for each termination type and controlling the overload of the media gateway call resource for each termination type. A message transceiver for transmitting an add request message; A controller configured to manage an overload of a media gateway call resource for each termination type based on the overload control message and to form the ed request message according to a management result; And Storage unit for storing information on the overload rating for each termination type under the control of the controller Mobile exchange server comprising a. The method of claim 1, wherein the control unit, A mobile switching server that manages the overload rating of a specific termination type in at least two stages. The method of claim 2, wherein the overload rating is, Mobile switch server, characterized in that consisting of 0 to 255 steps. The method of claim 3, wherein the control unit, The mobile switch server for raising the overload level of the specific termination type by one step when receiving the overload control message for the specific termination type. The method of claim 4, wherein the control unit, And increasing the overload rating of the specific termination type by one step and not increasing the overload rating of the specific termination type until a predetermined time elapses. The method of claim 5, wherein the mobile exchange server, And if the overload control message is not received within a predetermined time after increasing the overload rating of the specific termination type by one step, lowering the overload rating of the specific termination type by one step. The method of claim 6, wherein the media gateway, Mobile load switch server characterized in that the load ratio is reduced by 5% compared to the previous grade when the first stage of the overload class of the specific termination type, and the load ratio is increased by 5% compared to the previous grade when the first stage is lowered. As the overload control method according to the termination type, a) receiving an overload control message on whether or not the media gateway call resource is overloaded for each termination type; b) managing overload of a media gateway call resource for each termination type based on the overload control message; And c) forming an add request message according to the management result and transmitting the message to the media gateway Overload control method according to the termination type comprising a. The method of claim 8, wherein step b) b1) increasing the overload rating of the specific termination type by one step when receiving an overload control message for the specific termination type from the media gateway; And b2) increasing the overload rating of the specific termination type by one step and then lowering the overload rating of the specific termination type by one step if the overload control message is not received within a predetermined time; Overload control method according to the termination type comprising a. The method of claim 9, wherein step b1) The overload control method according to the termination type does not increase the overload rating of the specific termination type again until a predetermined time elapses after increasing the overload rating of the specific termination type one step. The method of claim 10, The overload control method according to the termination type, characterized in that the load ratio is reduced by 5% compared to the previous grade when the first stage of the overload rating of the specific termination type, and increases by 5% compared to the previous grade when the first stage is lowered.

Images