KR101058671B1 - Overload control method, switching unit and mobile communication system for it - Google Patents

Overload control method, switching unit and mobile communication system for it Download PDF

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KR101058671B1
KR101058671B1 KR1020080057933A KR20080057933A KR101058671B1 KR 101058671 B1 KR101058671 B1 KR 101058671B1 KR 1020080057933 A KR1020080057933 A KR 1020080057933A KR 20080057933 A KR20080057933 A KR 20080057933A KR 101058671 B1 KR101058671 B1 KR 101058671B1
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South Korea
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overload
service
address
end device
control
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KR1020080057933A
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Korean (ko)
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KR20090131931A (en
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박혁수
이성주
정충근
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주식회사 케이티
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Abstract

The present invention relates to an overload control method, an exchange end device and a mobile communication system.

An overload control method according to an embodiment of the present invention comprises the steps of setting an overload control address of a service end device in which an overload occurs among a plurality of service end devices that perform work processing for providing a mobile communication service to a mobile terminal, and Blocking transmission of at least one of a plurality of control signals destined for the address set as the overload control address.

Overload Control, Mobile Communication System, CAP, MAP

Description

Method for controlling overloard, and switching-end apparatus and mobile communication system for the same

The present invention relates to a mobile communication system, and more particularly, to a method of controlling an overload of a service end device for performing work processing for providing a mobile communication service, and a switching end device and a mobile communication system therefor.

With the rapid development of computer, electronic and communication technologies, various wireless communication services using wireless networks have been provided. In order to provide such a service, a mobile communication system has been developed through a first generation analog AMPS (Advanced Mobile Phone Systems) method and a second generation cellular (PCS) / personal communication service (PCS) method. Recently, IMT-2000 (International Mobile Telecommunication-2000), a third generation high speed data communication, has been used. IMT-2000 was developed for personal mobility guarantee and high speed data transmission to ensure mobility between countries by integrating systems of countries using different wireless access standards. It is asynchronous with Code Division Multiple Access (CDMA) 2000, which is a synchronous method. It was developed separately from Wideband Code Division Multiple Access (WCDMA).

With the development of mobile communication technology, users are using not only mobile calls but also various types of mobile communication services such as short messages and mobile internet. As the usage rate of the mobile communication service increases, the call in the mobile communication system may be congested at a specific time. Therefore, the development of technology for the maintenance and management of a mobile communication system as well as the development of a mobile communication service is required.

An object of the present invention is to control overload in a mobile communication system.

The objects of the present invention are not limited to the above-mentioned objects, and other objects that are not mentioned will be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, in the overload control method according to an embodiment of the present invention, the overload control of the address of the service-end device in which the overload occurs among a plurality of service-end devices performing a task processing for providing a mobile communication service to the mobile terminal Setting an address, and blocking transmission of at least one of a plurality of control signals destined for the address set as the overload control address.

In order to achieve the above object, the switching end device according to an embodiment of the present invention overload control of the address of the service end device that the overload occurs among a plurality of service end devices performing a task processing for providing a mobile communication service to the mobile terminal And a storage unit for setting an address, and a controller for blocking transmission of at least one of a plurality of control signals destined for the address set as the overload control address.

In order to achieve the above object, a mobile communication system according to an embodiment of the present invention, the switching terminal device for exchanging a call of the mobile terminal, the operation for providing a mobile communication service to the mobile terminal at the request of the switching terminal device; A plurality of service end devices for performing processing, and a signaling gateway for relaying signals between the switching end device and the plurality of service end devices, wherein the switching end device comprises a service end having an overload among the plurality of service end devices; Set the address of the device as the overload control address, and block transmission of at least one of the plurality of control signals destined for the address set as the overload control address.

Specific details of other embodiments are included in the detailed description and the drawings.

According to the overload control method of the present invention as described above, the switching end device and the mobile communication system for this, it is possible to more effectively control the overload in the mobile communication system.

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

1 is a diagram illustrating a mobile communication system according to an embodiment of the present invention. The illustrated mobile communication system 100 may include a switch end device 110, a signaling gateway 120, and a service end device 130.

The switch end device 110 may relay signals between the mobile terminals or between the mobile terminal and another device. In order to process the signal transmitted from the mobile terminal, the switching end device 110 may request the necessary information from the service end device 130, or may transmit the signal transmitted from the mobile terminal to the service end device 130. According to an embodiment of the present invention, when the service end device 130 is overloaded, the switching end device 110 may block some or all of the signals to be transmitted to the service end device 130. Through this, a condition in which the overload of the service terminal device 130 can be eliminated can be created.

The service end device 130 may process information necessary for providing a mobile communication service to the mobile terminal according to a request of the switching end device 110, and provide the result to the switching end device 110.

The signaling gateway 120 may relay a signal between the switch terminal device 110 and the service terminal device 130.

The mobile communication system 100 is No. 7 may be based on a protocol, and devices constituting the mobile communication system 100 may perform communication in an end-to-end manner. Of course, the present invention is not limited thereto, and the mobile communication system 100 may be based on another type of communication protocol in which a call line and a control signal line are separated. Preferably, communication using the Mobile Application Part (MAP) message or the Customized Application for Mobile Enhanced Logic (CAMEL) Application Part (CAMEL) message between the switching end device 110 and the service end device 130. This can be done.

In FIG. 1, the switching terminal device 110, the signaling gateway 120, and the service terminal device 130 are illustrated one by one, but this is only a schematic diagram of the basic structure of the mobile communication system 100. Accordingly, the present invention is not limited thereto, and the mobile communication system 100 may include a plurality of each of these devices. One specific embodiment of the mobile communication system 100 is shown in FIG. 2.

The mobile terminal 210 may be connected to a core network through the wireless access network 220. That is, the mobile terminal 210 is a portable communication device capable of performing wireless communication using the mobile communication system 100. An example of the mobile terminal 210 is a mobile phone. However, embodiments of the mobile terminal 210 are not limited to mobile phones, as the boundary between digital devices is flexible due to the development of digital technology. Thus, the mobile terminal 210 may be implemented with other types of portable digital devices, such as personal digital assistants (PDAs) or notebook computers.

The radio access network 220 may include a base station 221 and a radio network controller (RNC) 222. The base station 221 may serve as a contact point between the wireless access network 220 and the mobile terminal 210. In addition, the wireless network controller 222 is wired and wireless channel management, protocol matching processing of the mobile terminal 210 and the base station 221, soft handoff processing, GPRS (General Packet Radio Service) access, system loading (Loading) ), Failure management, etc. can be performed. In FIG. 2, the wireless network controller 222 is connected to one base station 221, but this is exemplary. Accordingly, the wireless network controller 222 may be connected to a plurality of base stations, and the present invention is not limited by the number of base stations connected to the wireless network controller 222. Of course, there may be a plurality of mobile terminals 210 connected to the wireless network controller 222 and the wireless access network 220.

The wireless access network 220 may cover a geographic area that may be divided into cells, which are wireless communication areas that the base station 221 can support. One example of the radio access network 220 may be a Universal Mobile Telecommunications (UTTS) Terrestrial Radio Access Network (UTRAN). The UTRAN may be based on Wideband Code Division Multiple Access (W-CDMA).

The radio access network 220 may accommodate a circuit switched service and a packet switched service. More specifically, when the wireless access network 220 supports the circuit switched service, the wireless network controller 222 is a public switched telephone network (PSTN) and integrated ISDN (Mobile Switching Center) (MSC, 230) Services Digital network). In addition, when the wireless access network 220 supports the packet switching service, the wireless network controller 222 may serve a serving General Packet Radion Service (GPRS) Support Node (SGSN, 240) and a Gateway GPRS Support Node (Gateway). It may be connected to a packet switched network (eg, the Internet or an X-25 external network) via a GPRS Support Node (GGSN, not shown). Here, the mobile switching center 230 and the SGSN 240 may be an example of the switching end device 110 shown in FIG. Of course, the example of the switching end device 110 is not limited thereto. For example, other types of mobile communication equipment requesting the service end device 130 to process a specific task using a MAP message or a CAP message may also be implemented as a switching end device.

The home location register (HLR) 250 may manage location information of the mobile terminal 210 (for example, an address of an MSC that manages a wireless access network to which the mobile terminal is connected) and subscriber additional service information. have. The HLR 250 may register location information of the mobile terminal 210 through communication with the MSC 230 or provide location information of the mobile terminal 210 at the request of the MSC 230.

The service control point (SCP) 260 manages the logic and data of the intelligent network service, determines whether the received call is a call of the intelligent network service, and controls the intelligent network service if it is determined to be the call of the intelligent network service.

The Short Message Service Center (SMSC) 270 may provide a service for transmitting a text message between the mobile terminal and the mobile terminal, or between the mobile terminal and the short message entities (SMEs). The SMSC 270 may be connected to the HLR 250 and the MSC 230 to determine the location of the mobile terminal to receive the text message.

Here, the HLR 250, the SCP 260, and the SMSC 270 may be an example of the service end device 130 illustrated in FIG. 1. Of course, the present invention is not limited thereto, and the mobile communication service is performed to the mobile terminal 210 by performing end-to-end communication with the switching device 110 such as Gateway Mobile Location Center (GMLC) or GSM Service Switching Function (gsmSSF). Mobile communication system configuration devices capable of performing a job process for providing the information may also be included in the service end device 130 of FIG.

In the present invention, the switching terminal device 110 may transmit a control signal to the service terminal device 130 for requesting the processing of work required to provide a mobile communication service to the mobile terminal. Here, the control signal may include a MAP message or a CAP message. As an example of the control signal, the mobile switching center 230 requests the HLR 260 to register the location of the mobile terminal 210, and when a call is received from the mobile terminal 210 to request a call connection, the mobile telephone is received. Signal that the switching center 230 requests the HLR 260 to search for the location of the called party (called mobile terminal), and the SMS message transmitted from the mobile terminal 210 to the called mobile terminal is transmitted to the called mobile terminal. A signal requesting the SMSC 280 may be mentioned.

Although one signaling gateway 120 is shown in FIG. 2, this is exemplary and the mobile communication system 100 may include a plurality of signaling gateways.

Since one service end device 130 may communicate with the plurality of switching end devices 110, the service end device 130 may be overloaded when the call is congested. In this case, when the switching end device 110 continuously transmits a signal (for example, a MAP message or a CAP message) to the service end device 130, it becomes difficult to recover the overload state of the service end device 130. Therefore, when an overload occurs in the service end device 130, the switch end device 110 may perform an overload control operation on the service end device 130 by appropriately blocking a signal to be transmitted to the service end device 130. have.

3 is a flowchart illustrating a process of setting an overload address according to an embodiment of the present invention. In the present embodiment, the signal transmitted between the switch terminal device 110 and the service terminal device 130 may include a MAP message or a CAP message. In addition, in the present embodiment, the description of the operation of the signaling gateway 120 is omitted, but as described above, the signaling gateway 120 is a signal transmitted between the switching device 110 and the service device 130. Can be relayed.

First, the switching terminal device 110 may determine whether there is a service terminal device in which an overload occurs among the plurality of service terminal devices (S310).

According to an embodiment of the present invention, when the exchange end device 110 receives an address of the service end device 130 in which an overload has occurred from an administrator of the mobile communication system, the switch end device 110 overloads the service end device 130 of the input address. Can be determined to have occurred.

According to another exemplary embodiment of the present invention, the service end device 130 may transmit a signal (hereinafter referred to as an “overload notification signal”) informing the occurrence of the overload to the switching end device 110 when an overload occurs due to an increased workload. have. For example, the service end device 130 may transmit an overload notification signal to the switching end device 110 when the control signal input rate per unit time exceeds the threshold rate. When the overload notification signal is received, the switching device 110 may determine that the overload occurs in the service device 130 that transmits the signal.

According to another embodiment of the present invention, when the switching end device 110 transmits a control signal to the service end device 130, and the response signal is not received from the service end device 130 within a predetermined time therefrom In addition, the service terminal device 130 may determine that an overload has occurred.

Of course, the present invention is not limited to these embodiments, and another embodiment may be applied to determine whether an overload occurs in the service end device 130.

When it is determined that an overload occurs in the service end device 130, the exchange end device 110 may set the address of the service end device 130 as an overload control address (S320). According to an embodiment of the present invention, a global title (GT) may be used as an address of each device performing end-to-end communication in the mobile communication system 100. The global title is an identifier uniquely assigned to each device in all domestic and foreign No.7 signaling networks.

Thereafter, the exchange end device 110 may determine whether the overload state of the service end device 130 in which the overload has occurred is resolved (S330).

According to an embodiment of the present invention, the switching terminal device 110, when the threshold time elapses from the setting of the address of the service terminal device 130 overloading overload control address, the overload state of the service terminal device 130 Can be determined to be resolved. The threshold time may be a preset fixed value. However, the present invention is not limited thereto, and the threshold time may be dynamically determined according to the degree of overload of the service end device 130. For example, the overload notification signal transmitted by the service end device 130 to the switching end device 110 may include information indicating a control signal input rate per unit time of the service end device 130. The higher the control signal inlet ratio of N), the longer the threshold time, and the lower the control signal inlet ratio of the service terminal device 130, the shorter the critical time. The fixed value of the threshold time or the information for dynamically determining the threshold time may be determined to be a value suitable for eliminating the overload state of the service end device through preliminary experiments and may be stored in the switching end device 110.

According to another exemplary embodiment of the present invention, when the exchange end device 110 receives an address of the service end device 130 from which the overload has been eliminated from the administrator of the mobile communication system, It can be determined that the overload has been eliminated.

According to another embodiment of the present invention, when the overload condition is resolved, the service end device 130 may transmit a signal (hereinafter referred to as an 'overload release signal') informing of the overload release to the switching end device 110. . For example, the service end device 130 in an overloaded state may transmit an overload release signal to the switching end device 110 when the control signal input rate per unit time does not exceed the threshold rate. When the overload release signal is received, the switching end device 110 may determine that the overload state is resolved in the service end device 130 that transmits the signal.

When it is determined that the overload state of the service end device 130 that has been overloaded has been resolved, the switching end device 110 may release the overload control address setting for the address of the service end device 130 (S340). ). That is, the switching terminal device 110 may delete the address of the service terminal device 130 overload is removed from the list of overload control addresses.

Through the embodiment of FIG. 3, the switching terminal device 110 may distinguish between the service terminal device 130 that is overloaded and the service terminal device that is not, and block the control signal to be transmitted to the service terminal device 130 that is overloaded. Can be. An embodiment thereof is shown in FIG. 4.

As described with reference to FIG. 3, when setting an overload control address or releasing the setting of an overload control address, when a control signal should be transmitted to a specific service end device (S410), the switching end device 110 may determine the control signal. It may be determined whether the address of the service end device (hereinafter, referred to as a destination service end device in the present embodiment) as the destination is set as the overload control address (S420).

If it is determined that the address of the destination service end device is not set to the overload control address, the exchange end device 110 may transmit a control signal to the destination service end device (S430).

However, if the address of the destination service end device is set to the overload control address, the switching end device 110 may block the transmission of the control signal (S440). Here, blocking the transmission of the control signal may include the meaning of discarding the generated control signal or not generating the control signal. At this time, the request signal (for example, a call connection call, a location registration request, a short message transmission request, etc.) of the mobile terminal on which the control signal is generated may be discarded.

Of course, it is not necessary to block all transmission of the control signal to the overload service end device. According to an embodiment of the present invention, when the switching end device 110 registers the address of the service end device in which the overload has occurred as an overload control address, the switching end device 110 may set a blocking rate of a control signal to be transmitted to the corresponding service end device. For example, if the blocking rate is set to 50%, the switching end device 110 blocks 50% of the plurality of control signals to be transmitted to the service end device 130 in which the overload has occurred, and the remaining 50% of the switching end device 110 ) Can be sent. More specifically, when the control signal blocking rate for the service end device 130 is set to 50%, the switching end device 110 generates an odd number of control signals destined for the service end device 130. The control signal is blocked and the even-numbered control signal can be transmitted to the service end device 130.

The blocking rate of the control signal may be dynamically determined according to the degree of overload of the service terminal device 130. For example, as the control signal reception rate per unit time of the service end device 130 overloading is higher, the switching end device 110 may set a higher blocking rate of the control signal to be transmitted to the service end device 130. As mentioned in the embodiment of FIG. 3, the control signal inflow rate per unit time of the service end device 130 in which the overload has occurred may be included in the overload notification signal transmitted to the switching end device 110 by the service end device 130. Can be.

Of course, the present invention is not limited thereto. The control signal blocking rate for the service end device 130 in which the overload has occurred may be set by the mobile communication system administrator or may be set to a fixed value in advance.

According to an embodiment of the present invention, the switching device 110 may determine whether to block the control signal according to the type of the control signal to the service terminal device 130 overload. For example, when the HLR 260 is overloaded, the MSC 230 transmits a location registration request signal for requesting location registration of the mobile terminals to the HLR 260 and processes a call request between the mobile terminals. All or part of the location information request signal for inquiring the HLR 260 of the destination mobile terminal may be blocked. Of course, the reverse case is also possible, and the type of control signal to be blocked may vary depending on the embodiment.

According to an embodiment of the present invention, when the switching device 110 is overloaded and the control signal to be transmitted to the service device 130 is blocked, the switch terminal device 110 calls a call associated with the blocked control signal. Guidance information indicating that call processing is interrupted can be transmitted to the calling mobile terminal. For example, when the mobile terminal 210 requests a call with another mobile terminal, the MSC 230 may transmit a location information request signal for inquiring the location information of the destination mobile terminal to the HLR 250. If the HLR 250 is overloaded, the MSC 230 may block the location information request signal without transmitting the HLR 250 to the HLR 250. At this time, the MSC 230 may transmit a guide information to the mobile terminal 210 to attempt to call again, or the call connection failed due to traffic congestion. The guide information may include at least one of a voice message and a text message.

5 is a block diagram showing a switching end device 110 according to an embodiment of the present invention. Switching end device 110 is the interface unit 510, the signal processing unit 520

The interface unit 510 may transmit or receive a signal with the wireless access network 220 and the service end device 130. Of course, the exchange end device 110 may include an interface unit for communication with the wireless access network 220 and an interface unit for communication with the service end device 130.

The signal processor 520 may interpret a signal received from another device and generate a signal to be transmitted to the other device. In addition, the signal processor 520 may generate a signal including guide information indicating that call processing is interrupted when transmission of a control signal destined for a service terminal device having an overload is interrupted. The signal including the guide information may be transmitted to the mobile terminal through the interface unit 510.

If the switching terminal device 110 supports the No. 7 protocol, the signal processing unit 520 may be configured as a telephone user part (TUP) or an integrated services digital network (ISDN) in charge of signal processing required for telephone call control. An ISDN User Part (ISP) that provides circuit switched and supplementary services for voice and non-voice applications, and a Transaction Capability Application Part that provides connectionless related intelligent network services between communication network elements; TCAP), Signaling Connection Control Part (SSCP), which provides logical signal connection control and transmission of signal data in the network, and Level 1 to Level 3, which performs signal data connection functions and signal message transmission and processing functions. Up to a Message Transfer Part (MTP) and the like.

The storage unit 530 may set an address of the service terminal device 130 in which an overload occurs as an overload control address and manage the list of overload control addresses. If the overload state of the service terminal device 130 is resolved, the storage unit 530 may delete the address of the service terminal device 130 from the overload control address list.

The controller 540 may block transmission of a control signal destined for the service terminal device 130 having an overload, by referring to the overload control address list stored in the storage 530. In addition, the control unit 540 may control each component constituting the switching device 110 so that the switching device 110 operates according to the embodiment described with reference to FIGS. 1 to 4. An operation process between the respective components constituting the switch terminal device 110 may be specifically understood through the embodiments described with reference to FIGS. 1 to 4.

In addition, the switching end device 110 may further include components for performing basic functions of the corresponding device, depending on what kind of device, such as the MSC 230 or the SGSN 240.

Components constituting the switched end device 110 shown in FIG. 5 may be implemented as a module. Herein, the term 'module' refers to a hardware component such as software or a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC), and a module plays a role. However, modules are not meant to be limited to software or hardware. A module may be configured to reside on an addressable storage medium and may be configured to execute one or more processors. Thus, as an example, a module may include components such as software components, object-oriented software components, class components, and task components, and processes, functions, properties, procedures, subroutines. , Segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functionality provided by the components and modules may be combined into a smaller number of components and modules or further separated into additional components and modules.

Although embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. You will understand that. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

1 is a diagram illustrating a mobile communication system according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating the mobile communication system of FIG. 1 in more detail.

3 is a flowchart illustrating a process of setting an overload address according to an embodiment of the present invention.

4 is a flowchart illustrating a control signal blocking process according to an embodiment of the present invention.

5 is a block diagram illustrating an exchange end device according to an exemplary embodiment of the present invention.

<Explanation of symbols on main parts of the drawings>

510: interface unit 520: signal processing unit

530: storage unit 540: control unit

Claims (14)

An overload control method performed by an exchange end device for exchanging a call of a mobile terminal in a mobile communication system, Setting, as an overload control address, an address of a service end device in which an overload has occurred among a plurality of service end devices which perform work processing for providing a mobile communication service to the mobile terminal according to a request of the switching end device; Blocking transmission of at least one of a plurality of control signals destined for the address set as the overload control address; And Releasing the setting of an overload control address for the address of the service terminal device in which the overload occurred when a threshold time elapsed based on a control signal input rate per unit time received from the service terminal device in which the overload has occurred; Overload control method. The method of claim 1, The ratio of the control signal from which transmission is interrupted among the plurality of control signals is determined to be a preset fixed value or dynamically set according to the degree of overload of the service end device. delete The method of claim 1, Overload control method according to the type of the control signal is determined a control signal from which transmission is cut out of the plurality of control signals. The method of claim 1, The overload control method is an overload control method which is a service end device in which a ratio of a control signal per unit time is greater than or equal to a threshold ratio. The method of claim 1, And transmitting guide information indicating that the call processing is interrupted to a mobile terminal originating a call associated with a control signal from which the transmission is interrupted. The method of claim 1, The control signal includes a MAP message or a CAP message. The method of claim 1, Wherein the address comprises a global title. An exchange end device for exchanging calls of mobile terminals in a mobile communication system, A storage unit configured to set, as an overload control address, an address of a service terminal device in which an overload occurs among a plurality of service terminal devices which perform a job process for providing a mobile communication service to the mobile terminal according to a request of the switching terminal device; And Blocking transmission of at least one of a plurality of control signals destined for the address set as the overload control address, and when the threshold time set based on the control signal input rate per unit time received from the service terminal device in which the overload has occurred And a control unit for releasing the setting of the overload control address for the address of the service end device in which the overload has occurred. The method of claim 9, The ratio of the control signal from which transmission is interrupted among the plurality of control signals is determined as a preset fixed value or dynamically set according to the degree of overload of the service end device. delete The method of claim 9, And a control signal from which transmission is cut out of the plurality of control signals is determined according to a type of control signal. The method of claim 9, And the service end device in which the overload has occurred is a service end device in which a ratio of a control signal per unit time is equal to or greater than a threshold ratio. Switching end device for exchanging calls of the mobile terminal; A plurality of service end devices for performing job processing for providing a mobile communication service to the mobile terminal in response to a request of the switching end device; And A signaling gateway for relaying signals between the switching terminal device and the plurality of service terminal devices; The switching end device sets the address of the service end device in which the overload occurs among the plurality of service end devices as an overload control address, and blocks transmission of at least one of a plurality of control signals destined for the address set as the overload control address. A mobile communication system for releasing an overload control address for an address of the service terminal device in which the overload has occurred has elapsed when a threshold time elapsed based on a control signal input rate per unit time received from the service terminal device in which the overload has occurred. .
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WO2013187657A1 (en) * 2012-06-14 2013-12-19 주식회사 아이디어웨어 Method for managing network load reduction policy in overloaded areas
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KR100516917B1 (en) 2005-03-23 2005-09-26 펌킨넷코리아 (주) System and its method for protecting servers from internet traffic surge by controlling the number of sessions in a network side

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KR100516917B1 (en) 2005-03-23 2005-09-26 펌킨넷코리아 (주) System and its method for protecting servers from internet traffic surge by controlling the number of sessions in a network side

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