KR20150031786A - Apparatus for handling Application Server failure in called network, method thereof and computer recordable medium storing the method - Google Patents

Abstract

The present invention relates to an apparatus and a method for handling the failure of an application server in a destination network, and to a computer-readable recording medium containing the method. When receiving a session connection request message from a user device, a serving call state control function (S-CSCF) needs to deliver the session connection request message to an application server (AS) in order to trigger the provision of an additional service to the user device. If the AS has a failure, the S-CSCF transmits the session connection request message to a media gateway (MGW). The MGW converts the session connection request message (INVITE) conforming to SIP into a call connection request message (IAM) conforming to ISUP, and delivers the call connection request message to a circuit switching network. Accordingly, entities, for processing calls and providing additional services in the circuit switching network, provide an additional service and perform a call-processing procedure normally. As a result, the present invention can perform a call-processing procedure and provide an additional service normally even when an application server has a failure in a destination network, thereby increasing service reliability.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a device for processing an application server failure in a called network, a method for the same, and a computer readable recording medium on which the method is recorded.

The present invention relates to a network fault handling technique, and more particularly, to a device for providing an additional service and a call connection procedure normally when a failure occurs in an entity for providing an additional service in a destination network, The present invention relates to a computer-readable recording medium on which a method is recorded.

IMS (IP Multimedia Subsystem), which was originally developed for the IP multimedia service of the 3G mobile communication network, is now becoming a core technology for providing new services in next generation communication environment based on All IP. The need for service control through IMS control in IP-based networks can be found in the convergence of service quality, billing, and different services.

Although all multimedia services can be provided through existing Internet connections, this is limited to best-effort services. However, the quality of the session can be guaranteed by performing resource allocation for the session through the IMS. IMS also enables proper billing of sessions. It is possible to provide an appropriate charging method according to the type and quality of the service, the characteristics of the user, and the policy of the network provider and the service provider, not simply the billing based on the flat rate or the packet amount. In addition, IMS can easily create a new service through an open interface protocol and provide an environment to create a new service by combining with existing service. The nature of IMS, which provides both control and billing capabilities for services to both network operators and service providers, and provides the user with means to perform all of their services, not only in their home network but also in roaming, This is why the defined IMS is becoming the basic control platform in the all IP based wired / wireless integrated environment.

Korean Registered Patent No. 0975740, August 06, 2010 (Name: Handover method and apparatus in heterogeneous wireless communication network)

An object of the present invention is to provide a device for processing a fault that can normally provide an additional service together with a call connection procedure when a failure occurs in an application server (AS) for providing an additional service in a destination network, And a computer-readable recording medium on which the method is recorded.

According to another aspect of the present invention, there is provided a service control apparatus for performing fault handling, including: an interface module for transmitting and receiving a message; And if the application gateway receives a session connection request message from the user equipment through the interface module, the media gateway converts the session connection request message into a call connection request message and transmits the call connection request message to the circuit switching network, And a control module for transmitting the session connection request message to the media gateway.

According to another aspect of the present invention, there is provided a method for processing a fault in a service control apparatus, the method comprising: checking whether an application server has a fault when receiving a session connection request message; And transmitting, by the media gateway, the session connection request message to the media gateway so that the media gateway converts the session connection request message into a call connection request message and transfers the session connection request message to the circuit switching network.

According to the present invention, when the service control apparatus (S-CSCF) of the called party receives the session connection request message from the calling-side user apparatus, if there is a fault in the application server (AS), the circuit- To provide additional services and provide call connection procedures. As described above, even when a failure occurs in the application server (AS) of the destination network, the present invention can handle the call processing procedure normally, thereby enhancing the reliability of the service.

1 is a diagram for explaining a configuration of a communication system according to an embodiment of the present invention.
2 is a block diagram illustrating an internal configuration of a user apparatus according to an embodiment of the present invention.
3 is a block diagram illustrating an internal configuration of a service control apparatus according to an embodiment of the present invention.
4 is a flowchart illustrating a fault handling method according to an embodiment of the present invention.
5A to 5E are flowcharts for explaining a failure occurrence confirmation method according to an embodiment of the present invention.
FIG. 6 is a flowchart illustrating a fault handling method of a service control apparatus according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the detailed description of known functions and configurations incorporated herein will be omitted when it may unnecessarily obscure the subject matter of the present invention.

1 is a diagram for explaining a configuration of a communication system according to an embodiment of the present invention.

Referring to FIG. 1, a communication system according to an embodiment of the present invention is a system in which a packet switching (PS) network and a circuit switching network are mixed. For example, the packet-switched network may be an IMS (IP Multimedia Subsystem) network. The packet switching network of the present invention includes a switching device 200, a call state control function (CSCF) server, a home subscriber server (HSS) 600, and an application server (AS) In particular, the CSCF server includes a Proxy Call State Control Function (P-CSCF) 300, an Interrogating Call State Control Function (I-CSCF) 400, and a Service Control Unit (S- State Control Function, 500). Here, the CSCF server is a server in which the proxy control device (P-CSCF 300), the connection control device (I-CSCF 400), and the service control device (S-CSCF 500) . Alternatively, the proxy control device (P-CSCF 300), the connection control device (I-CSCF 400), and the service control device (S-CSCF 500) may be implemented as separate devices. In addition to the destination network 20, the configuration of the circuit switching network is shown. This includes a media gateway (MGW) 800, a mobile switching center (MSC) and an additional service providing device 910.

The switching device 200 transmits a message received from the user device 100 to one of the plurality of proxy control devices 300. Here, the message may be a SIP (Session Initiation Protocol) message. For example, the switching device 200 may be an L4 (layer 4) switch. Switching device 200 has distribution rules that distribute a number of messages received from each of a plurality of user devices 100 such that the load on a plurality of proxy control devices 300 is distributed. According to this distribution rule, the switching device 200 forwards the message received from the specific user device 100 to the specific proxy control device 300. [

CSCF (Call State Control Function) server can perform basic functions for SIP based session control such as subscriber registration, authentication, additional service provisioning, routing, various call control, and address handling.

Proxy control device 300 is the first point at which user device 100 connects to the IMS. When the REGISTER message is transmitted from the user device 100, the proxy control device 300 may transmit the REGISTER message to the connection control device 400. [ The proxy control apparatus 300 stores the address of the service control apparatus 500 allocated to the user apparatus 100 in the registration request message process and if the session connection request message is received from the user apparatus 100, And can forward it to the stored service control apparatus 500 as an address.

The connection control apparatus 400 registers the location of the user device 100 in the home subscriber server 600 in the process of registering the user of the user device 100, that is, the subscriber. The connection control device 400 obtains the address list of the available service control device 500 from the home subscriber server 600 and refers to the address list to be assigned to the user device 100, (500). Alternatively, the connection control apparatus 400 may receive a message including the address of the service control apparatus 500 allocated to the user apparatus 100 from the home subscriber server 600, The control device 500 can be determined.

The service control apparatus 500 can register a subscriber to the home subscriber server 600 and obtain a profile from the home subscriber server 600 when the registration request message is received from the connection control apparatus 400. [ The service control apparatus 500 can confirm the type of the additional service to be provided to the user device 100 using the profile. The service control apparatus 500 connects the user apparatus 100 and the application server 700 so that the application server 700 can exchange messages between the user apparatus 100 and the application server 700 so that the application server 700 can provide additional services to the user apparatus 100. In addition, the service control apparatus 500 can acquire and manage authentication information, i.e., an authentication vector (AV), from the home subscriber server 600. The service control apparatus 500 also authenticates the user using an AV (authentication vector).

The home subscriber server 600 may store and manage the user's profile, authentication and location related data as a database for the user of the user device 100, and may provide information requested by the CSCF server. Also, the home subscriber server 600 can generate an authentication vector required for authentication.

The application server 700 is an apparatus for providing an additional service and can communicate with the service control apparatus 500 using SIP. Examples of additional services include caller ID, call waiting, call hold, push-to-talk, call transfer, call forwarding, call blocking, malicious caller ID, legitimate intercept, Conference call service, voice mail, text and voice conversion, location based service, SMS, MMS, presence information, and instant message.

The media gateway 800 provides a signaling transformation between the packet-switched network and the circuit-switched network. The signaling conversion means to convert the format of the message between the protocol of the message used in the packet-switched network and the protocol of the message used in the circuit-switched network. For example, it performs conversion between a Session Initiation Protocol (SIP) message and an Integrated Services Digital Network (ISDN) User Part (ISUP) message. For this, the media gateway 800 has a protocol conversion function for interworking between the packet switching network and the circuit switching network.

When the user apparatus 100 is connected to the circuit switching network, the circuit switching system 900 interlocks with the connected user apparatus 100 with the home location register (HLR) (Home Location Register (not shown) or the home subscriber server 600 Performs authentication, and registers the location of the authenticated user device (100). When the user receives a service from the circuit switching network, the circuit switching center 900 downloads a profile from the home location register (not shown) or the home subscriber server 600 to perform a call connection procedure, 910 to perform additional service processing. It should be noted that the home location register and the home subscriber server 600 may be implemented as a single device or may be separately implemented by being combined with the home location register 600 in the home subscriber server 600. [ When implemented in one, the entities of the circuit switching network, in particular the circuit switching system 900, must also be able to access the home subscriber server 600. When the home location register and the home subscriber server 600 are separately implemented, the profile of the user stored in the home location register and the home subscriber server 600 must be synchronized.

The additional service providing device 910 collectively refers to the entities on the circuit switching network for providing each kind of additional service, and the additional service providing device 910 may be implemented by one or more devices. Such additional services may include services such as providing a calling number during an absence, rejecting a call reception, communicating notification, a coloring-back tone, and a voice message. The caller ID service provides the recipient with the telephone number of the caller who is not received when the caller attempts to connect the caller in a state in which the caller can not make a call. The Private Call Blocking service restricts the call connection of a particular caller. The call availability notification service is an additional service that, when the called party is in a call, notifies the caller that a call can be made with the called party when the called party becomes available to talk. The coloring backtone service is a service that provides a multimedia file as a ring back tone instead of a general tone ring back tone. The voice message service is a service for providing a caller with a voice message to a called party.

According to the embodiment of the present invention, the service control apparatus 500 receives and stores a profile including a list of supplementary services subscribed by the user apparatus 100 from the home subscriber server 600 in the registration procedure. Upon receiving a session connection request (INVITE) message from the user device 100, the service control apparatus 500 transmits a session connection request (INVITE) message to the application server 700 through the stored profile, (700). Accordingly, the application server 700 receiving the session connection request message provides the additional service to which the user apparatus 100 subscribes. A method of providing the additional service by the application server 700 will be described as an example of the coloring backtone service. It is assumed that the called user equipment to finally receive the session connection request message is subscribed to the coloring backtone service as an additional service. In this case, when the application server 700 receives the session connection request message, the application server 700 connects the session between the media device storing the coloring backtone and the calling user device, and notifies the media device of the coloring back- And the like.

However, the present invention assumes a situation where a failure occurs in the application server 700 of the destination network. In this case, the service control apparatus 500 transmits a session connection request message to the media gateway 800. Then, the media gateway 800 converts a session connection request (INVITE) message according to the SIP into an IAM (Initial Address Message) message according to the ISUP, and then transmits a call connection request message to the circuit switching center 900 do. Then, the circuit switching equipment 900 provides a call connection procedure, and can provide supplementary services to the user equipment 100 in cooperation with the supplementary service provision apparatus 910. [ As described above, according to the present invention, even when a network failure occurs, the call processing procedure can be normally performed, and the additional service can be normally provided, thereby increasing the reliability of the service.

2 is a block diagram illustrating an internal configuration of a user apparatus according to an embodiment of the present invention.

2, the user device 100 includes a communication unit 110, an input unit 120, a display unit 130, a storage unit 140, and a control unit 150.

The communication unit 110 performs a function of transmitting and receiving signals in a wireless communication system. Such a message may include a message according to an embodiment of the present invention. For this, the communication unit 110 may include a transmitter for up-converting and amplifying the frequency of a transmitted signal, a receiver for low-noise amplifying (LNA) the received signal, and down-converting the frequency. In particular, the communication unit 110 can perform communication according to a plurality of bands. For example, the communication unit 110 may include a transmitter and a receiver for performing communication via the circuit switching network according to the 3G band, and a transmitter and a receiver for performing communication via the packet-switching network according to the VoLTE band. The communication unit 110 may receive the message according to the 3G band or the VoLTE band, output the message to the controller 150, and transmit the signal output from the controller 150 in the 3G band or the VoLTE band.

The input unit 120 receives a user's key operation for controlling the user apparatus 100, generates an input signal, and transmits the input signal to the controller 150. The input unit 120 may include any one of a power key, a numeric key, and a direction key. In particular, when the display unit 130 is formed as a touch screen, the input unit 120 may include some or all of the functions of the input unit 120 on the touch screen.

The display unit 130 may be formed of a liquid crystal display (LCD), an organic light emitting diode (OLED), an active matrix organic light emitting diode (AMOLED) And visually provides menus, input data, function setting information, and various other information of the apparatus 100 to the user. The display unit 130 displays a boot screen, a standby screen, a menu screen, and other application screens of the user device 100. When the display unit 130 is a touch screen, the functions of the various keys of the input unit 120 can be performed through the touch screen. In the case where all the functions can be performed only by the touch screen, the input unit 120 may be omitted have.

The storage unit 140 stores programs and data necessary for the operation of the user apparatus 100, and can be divided into a program area and a data area. The program area may store a program for controlling the overall operation of the user device 100, an operating system (OS) for booting the user device 100, an application program, and the like. The data area is an area where user data generated according to use of the user device 100 is stored. In addition, the storage unit 140 may store various kinds of data generated according to the use of the user device 100 by the user. Each kind of data stored in the storage unit 140 can be deleted, changed or added according to a user's operation.

The control unit 150 may control the overall operation of the user device 100 and the signal flow between the internal blocks of the user device 100 and may perform a data processing function of processing the data. The controller 150 may be a central processing unit (CPU), an application processor (AP), or the like.

The control unit 150 generates an SIP (Session Initiation Protocol) message transmitted or received through the packet-switching network or an ISUP (Integrated Services Digital Network (ISDN) User Part) message transmitted and received through the circuit switching network and transmits the message through the communication unit 110 . In addition, the control unit 150 receives the SIP message or the ISUP message through the communication unit 110, and performs necessary operations according to the received message. Accordingly, according to the embodiment of the present invention, the control unit 150 can provide a 3G or VoLTE-based call service and an additional service for the call service to the user of the user device 100. [

3 is a block diagram illustrating an internal configuration of a service control apparatus according to an embodiment of the present invention.

3, a service control apparatus 500 according to an embodiment of the present invention includes an interface module 510, a storage module 520, and a control module 530.

The interface module 510 is for communication with the proxy control device 300, the connection control device 400, the home subscriber server 600, and the like. That is, the interface module 510 receives a message from the proxy control device 300, the connection control device 400 and the home subscriber server 600, and transmits the message to the proxy control device 300, the connection control device 400, The message can be transmitted to the server 600.

The storage module 520 is for storing data, and may store various kinds of data according to an embodiment of the present invention. In particular, the storage module 520 may store the authentication information (authentication vector, AV) and profile received from the home subscriber server 600 in the network registration procedure of the user device 100. The profile includes a list of additional services to which the user of the user device 100 subscribes. This profile is stored until the user device 100 releases the registration.

The control module 530 may control the overall operation of the service control apparatus 500 and the signal flow between the internal blocks of the service control apparatus 500 and may perform a data processing function for processing the data. The control module 530 may be a processor such as a central processing unit (CPU).

When the service control apparatus 500 is located in the destination network, the control module 530 can receive the session connection request message transmitted from the originating user apparatus located in the originating network through the interface module 510. Then, the control module 530 confirms the profile stored in the storage module 520 and confirms the additional service to which the called user equipment subscribes. Then, the control module 530 transmits a session connection request message to the application server 700 through the interface module 510. However, when a failure occurs in the application server 700, the control module 530 does not transmit a session connection request message to the application server 700. [ Instead, the control module 530 forwards the session connection request message to the media gateway 800 via the interface module 510. Then, the media gateway 800 converts a session connection request (INVITE) message according to the SIP into a call connection request (IAM) message according to the ISUP, and then transmits a call connection request message to the circuit switching center 900. Accordingly, the circuit switching system 900 provides a call connection procedure and, in conjunction with the additional service providing apparatus 910, will provide additional services to the user apparatus 100. [

A method for checking the failure of the application server 700 will be described below. According to one embodiment, the control module 530 may transmit a session connection request message to the application server 700 through the interface module 510. [ In response to the session connection request message, the control module 530 receives a failure occurrence notification message indicating the occurrence of a failure, or recognizes that a failure has occurred in the application server 700 when the control module 530 fails to receive any message for a predetermined time . According to another embodiment, the control module 530 may transmit a failure confirmation message periodically to the application server 700 through the interface module 510 to inquire about the failure. The control module 530 recognizes that a failure has occurred in the application server 700 by receiving a failure response message including an indicator indicating that a failure has occurred in response to the failure confirmation message through the interface module 510. [ According to another embodiment of the present invention, when a failure occurs, the application server 700 transmits a failure occurrence notification message to the service control apparatus 500 to notify the failure occurrence. Accordingly, the control module 530 recognizes that the application server 700 has a failure.

4 is a flowchart illustrating a fault handling method according to an embodiment of the present invention. In this embodiment, it is assumed that the first user equipment 101 of the originating network wants to connect a session to the second user equipment 102 of the called network. The first service control apparatus 501 is located in the originating network and the second service control apparatus 502 is located in the destination network.

Referring to FIG. 4, the first user equipment 101 transmits a session connection request message requesting a session connection with the second user equipment 102 in step S110. The session connection request message may be an INVITE message according to the SIP. The session connection request message includes the identification information of the first user device 101 that first transmitted the message and the identification information of the second user device 102 that will finally receive the message. The proxy control apparatus 300 transmits the session connection request message to the first service control apparatus 501 assigned to the first user equipment 100 in step S115.

Then, the first service control apparatus 501 transmits a session connection request message to the connection control apparatus 400 in step S120. Although not shown, the connection control apparatus 400 can check the location of the second user device 102 by inquiring of the home subscriber server 600. In step S125, the connection control apparatus 400 transmits a session connection request message to the second service control apparatus 502 of the destination network in which the second user equipment 102 is located.

The second service control apparatus 502 inquires the home subscriber server 600 when registering the second user apparatus 102 and receives the service profile of the user apparatus 100 from the home subscriber server 600. [ Accordingly, the second user device 102 can recognize the additional service to which the second user device 102 subscribes. Accordingly, when the second service controlling apparatus 502 receives the session connection request message from the first user equipment 101, the second service controlling apparatus 502 confirms the additional service subscribed by the second user apparatus 102 described as the called party in the session connection request message And transmits a session connection request message to the application server 700 providing the additional service.

However, it is assumed that a failure has occurred in the application server 700 in step S130. In this case, the second service control apparatus 502 can check the failure of the application server 700 in step S135. According to the embodiment of the present invention, the second service control apparatus 502 can confirm the failure of the application server 700 in various ways. A method for identifying the failure of the application server 700 will be described in detail below.

In step S140, the second service control apparatus 502 confirms the occurrence of the failure and transmits a session connection request message to the media gateway 800. [ The media gateway 800 converts the SIP message into an ISUP (Integrated Service Digital Network) message or converts the ISUP message into a SIP message. Accordingly, the media gateway 800 converts the INVITE message, which is a session connection request message, into a message of an initial address message (IAM). Then, the media gateway 800 forwards the call connection request message to the circuit switching center 900 in step S145. Upon receiving the call connection request (IAM) message, the circuit switch 900 confirms the supplementary service subscribed to by the second user equipment 102 and can provide the supplementary service in cooperation with the supplementary service provision apparatus 910 . At the same time, the circuit switch 900 transmits a call connection request message to the second user equipment 102 in step S150. After that, the second user equipment 102 receiving the call connection request message will perform the call connection procedure followed by other entities on the network in step S155.

As described above, according to the present invention, even when a network failure occurs, the call processing procedure can be normally performed, and the additional service can be normally provided, thereby increasing the reliability of the service.

5A to 5E are flowcharts for explaining a failure occurrence confirmation method according to an embodiment of the present invention. In this embodiment, specific embodiments of the step S135 of FIG. 4 are described above.

Referring to FIG. 4 and FIG. 5A according to the first embodiment, it is assumed that a failure occurs in the application server 700 in step S130. At this time, the second service control apparatus 502 transmits the session connection request message received from the connection control apparatus 400 to the application server 700 in step S210 (S125).

In step S215, the application server 700 receiving the session connection request message transmits a failure occurrence notification message to the second service control apparatus 502 to notify the occurrence of the failure. Such a failure notification message may be a 503 Service Unavailable message or a 504 Server Timeout message according to SIP. Here, the 503 Service Unavailable message is transmitted when the request can not be normally processed. In addition, the 504 Server Timeout message is sent when the application server 700 can not process the request within the time limit. Accordingly, the second service control apparatus 502 can recognize the occurrence of the failure of the application server 700. [

Referring to FIG. 4 and FIG. 5B according to the second embodiment, it is assumed that a failure occurs in the application server 700 in step S130. After the failure occurs, the second service control apparatus 502 transmits the session connection request message received from the connection control apparatus 400 to the application server 700 in step S220 (S125).

It is assumed that a failure has occurred and the application server 700 can not transmit any message. Therefore, the second service control apparatus 502 may not receive any message from the application server 700 within a predetermined time T. [

Accordingly, if the second service control apparatus 502 does not receive any messages until the predetermined time T elapses after step S225, the second service control apparatus 502 counts the predetermined time T after transmitting the session connection request message, It is determined that a failure has occurred in the application server 700.

According to SIP, SIP messages exchange messages in a handshaking manner consisting of a request and a response. For example, when a session connection request (INVITE) message is received, a session connection acceptance (200 OK) message is transmitted in response to the message. In addition, the SIP messages transmit acknowledgment messages indicating that the SIP message is received separately from the response message for the request. That is, the entity receiving the INVITE message must transmit an acknowledgment (ACK) message confirming receipt of the message to the entity that transmitted the INVITE message. When the second service control apparatus 502 fails to receive an acknowledgment message from the application server 700 within a predetermined time, the second service control apparatus 502 may determine that a failure has occurred in the application server 700.

Referring to FIG. 4 and FIG. 5C according to the third exemplary embodiment, the second service control apparatus 502 periodically transmits a failure confirmation message for inquiring whether a failure has occurred to the application server 700, You can check if there is a fault. That is, after transmitting the failure confirmation message in step S230, the second service control apparatus 502 may transmit a failure confirmation message in step S240 according to the transmission period F of the failure confirmation message.

In step S230, the application server 700 having received the failure confirmation message can not transmit the failure response message in step S235 because the failure has not occurred. On the other hand, if a failure occurs in the application server 700 in step S130, the application server 700 includes an indicator indicating that a failure has occurred in the failure response message. Then, the application server 700 transmits a failure response message including the indicator to the second service control apparatus 502 in step S245. Accordingly, the second service control apparatus 502 can recognize the occurrence of the failure of the application server 700. [

Referring to FIG. 4 and FIG. 5D according to the fourth exemplary embodiment, the service control apparatus 500 periodically transmits a failure confirmation message to the application server 700, Depending on the answer, you can check whether there is a fault. That is, after transmitting the failure confirmation message in step S250, the second service control apparatus 502 may transmit a failure confirmation message in step S260 according to the transmission period F of the failure confirmation message.

In step S250, the application server 700 having received the failure confirmation message can not transmit the failure response message in step S255 because the failure has not occurred. On the other hand, it is assumed that a failure occurs in the application server 700 in step S130, and the application server 700 can not transmit any message due to the failure.

At this time, the second service control apparatus 502 transmits a failure confirmation message in step S260, waits again for one period (F), and then transmits a failure confirmation message again. However, if the second service control apparatus 502 does not receive any message before the next period F arrives after transmitting the failure confirmation message in step S260, the second service control apparatus 502 determines that a failure has occurred in the application server 700 do. That is, when the second service control apparatus 502 transmits a failure confirmation message in step S260 and fails to receive any message before step S265 after one period F, the second service control apparatus 502 determines that a failure has occurred in the application server 700 do.

Referring to FIG. 4 and FIG. 5E according to the fifth embodiment, it is assumed that a failure has occurred in the application server 700 in step S130. In this case, the application server 700 transmits a failure occurrence notification message to the second service control apparatus 502 to notify the occurrence of the failure in step S270. Accordingly, when the second service control apparatus 502 receives the failure occurrence notification message indicating the occurrence of the failure generated by the application server 700 itself, the second service control apparatus 502 can recognize the failure of the application server 700.

FIG. 6 is a flowchart illustrating a fault handling method of a service control apparatus according to an embodiment of the present invention. This embodiment describes a failure handling method of the second service control apparatus 502 located in the destination network of FIG.

Referring to FIG. 6, the control module 530 may receive a session connection request (INVITE) message from the connection control device 400 through the interface module 510 in step S310. The session connection request message includes the identification information of the first user device 101 that is the sender and the identification information of the second user device 102 that is the receiver.

In step S320, the control module 530 determines whether the second user equipment 102 to receive the session connection request message subscribes to the supplementary service. The control module 530 may receive the profile from the home subscriber server 600 through the interface module 510 in the process of registering the second user device 102 in the called network. This profile includes a list of additional services to which the user of the second user device 102 subscribes. This profile is stored in the storage module 520 until the second user device 102 releases its registration. Accordingly, when the control module 530 receives the session connection request message, the control module 530 can confirm whether the second user device 102 is subscribed to the supplementary service through the pre-stored profile.

If it is determined in step S320 that the second user device 102 is not subscribed to the supplementary service, the control module 530 delivers a session connection request message to the proxy control device 300 of the destination network in step S330. Here, the proxy control device 300 is located in the destination network and is assigned to the second user device 102 in the registration procedure. Accordingly, the proxy control device 300 can transmit a session connection request message to the second user device 102. [

If it is determined in step S320 that the second user device 102 is subscribed to the supplementary service, the control module 530 proceeds to step S340. In step S340, the control module 530 determines whether a failure has occurred in the application server 700 providing the additional service. The method of determining the occurrence of a fault is as described in FIGS. 5A to 5E.

If it is determined in step S340 that a failure has occurred in the application server 700, the control module 530 proceeds to step S350. In step S350, the control module 530 transmits a session connection request message to the media gateway 800. [ The media gateway 800 converts a session connection request (INVITE) message according to the SIP into a call connection request (IAM) message according to the ISUP, and transfers the converted call connection request message to the circuit switching center 900. Accordingly, the circuit switching equipment 900 can interlock with the additional service providing apparatus 910 or can provide additional services exclusively to the circuit switching equipment 900. In addition, the circuit switch 900 transmits the received call connection request (IAM) to the second user equipment 102, so that the call connection procedure can proceed normally.

If it is determined in step S340 that the failure has not occurred in the application server 700, the control module 530 proceeds to step S360. In step S360, the control module 530 transmits the session connection request message received from the connection control apparatus 400 to the application server 700. [ Accordingly, the application server 700 can provide additional services to the second user device 102. [

The fault handling method according to an embodiment of the present invention as described above may be provided in the form of a computer readable medium suitable for storing computer program instructions and data. At this time, a computer-readable medium suitable for storing computer program instructions and data includes, for example, a magnetic medium such as a hard disk, a floppy disk and a magnetic tape, a compact disk read only memory (CD-ROM) Optical media such as a DVD (Digital Video Disk), a magneto-optical medium such as a floppy disk, and a ROM (Read Only Memory), a RAM , Random Access Memory), flash memory, EPROM (Erasable Programmable ROM), and EEPROM (Electrically Erasable Programmable ROM). The processor and memory may be supplemented by, or incorporated in, special purpose logic circuits. Examples of program instructions may include machine language code such as those generated by a compiler, as well as high-level language code that may be executed by a computer using an interpreter or the like. Such a hardware device may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

While the specification contains a number of specific implementation details, it should be understood that they are not to be construed as limitations on the scope of any invention or claim, but rather on the description of features that may be specific to a particular embodiment of a particular invention Should be understood. Certain features described herein in the context of separate embodiments may be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may also be implemented in multiple embodiments, either individually or in any suitable subcombination. Further, although the features may operate in a particular combination and may be initially described as so claimed, one or more features from the claimed combination may in some cases be excluded from the combination, Or a variant of a subcombination.

Likewise, although the operations are depicted in the drawings in a particular order, it should be understood that such operations must be performed in that particular order or sequential order shown to achieve the desired result, or that all illustrated operations should be performed. In certain cases, multitasking and parallel processing may be advantageous. Also, the separation of the various system components of the above-described embodiments should not be understood as requiring such separation in all embodiments, and the described program components and systems will generally be integrated together into a single software product or packaged into multiple software products It should be understood.

It should be noted that the embodiments of the present invention disclosed in the present specification and drawings are only illustrative of specific examples for the purpose of understanding and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

The present invention relates to an apparatus for processing an application server failure in a destination network in a communication system, a method therefor and a computer readable recording medium on which the method is recorded. According to the present invention, a service control apparatus (S-CSCF) Upon receiving the session connection request message from the user device, the session connection request message must be transmitted to the application server (AS) in order to trigger the user device to provide additional services. At this time, if there is a failure in the application server (AS), the service control apparatus (S-CSCF) transmits a session connection request message to the MGW. The media gateway (MGW) converts the session connection request (INVITE) message according to the SIP into a call connection request (IAM) message according to the ISUP, and transfers the message to the circuit switching network. Accordingly, entities providing call processing and supplementary services in the circuit switching network normally provide supplementary services and proceed with call processing procedures. In this way, even when a failure occurs in the application server AS of the destination network, the present invention can provide the call processing procedure and the additional service normally, thereby enhancing the reliability of the service. This is not only a possibility of commercialization or sales, but also a possibility of being industrially applicable since it is practically possible to carry out clearly.

100: user equipment (UE) 110: communication unit
120: input unit 130: display unit
140: storage unit 150: control unit
200: Switching device (L4 switch) 300: Proxy control device (P-CSCF)
400: Connection Control Device (I-CSCF) 500: Service Control Device (S-CSCF)
510: Interface module 520: Storage module
530: Control module 600: Home Subscriber Server (HSS)
700: Application server (AS) 800: Media gateway (MGW)
900: Circuit switching equipment (MSC) 910: Additional service providing device

Claims (7)

An interface module for sending and receiving messages; And
When receiving a session connection request message from the user equipment through the interface module, confirming the failure of the application server, the media gateway converts the session connection request message into a call connection request message and transmits the call connection request message to the circuit switching network, And a control module for transmitting the session connection request message to the media gateway through the service gateway. The method according to claim 1,
The session connection request message is an INVITE message according to a SIP (Session Initiation Protocol), and the call connection request message is an IAM (Initial Address Message) message according to an ISUP (Integrated Services Digital Network (ISDN) User Part) Service control device for fault handling. The method according to claim 1,
The control module
Transmits the session connection request message to the application server through the interface module, receives a failure occurrence notification message indicating a failure occurrence in response to the transmitted session connection request message, or receives a message for a predetermined time And if it fails, the failure of the application server is confirmed. The method according to claim 1,
The control module
And transmits a failure confirmation message to the application server periodically to inquire whether the failure has occurred via the interface module and receives a failure response message including an indicator indicating that a failure has occurred in response to the failure confirmation message, And if a message is not received before the next cycle arrives, a failure of the application server is confirmed. The method according to claim 1,
The control module
And a failure of the application server is acknowledged upon receipt of a failure occurrence notification message indicating occurrence of a failure generated by the application server itself. Upon receipt of the session connection request message, confirming whether the application server has a failure; And
And transmitting the session connection request message to the media gateway so that the media gateway converts the session connection request message into a call connection request message and transfers the session connection request message to the circuit switching network when the application server fails. A method for fault handling of a control device. A computer-readable recording medium on which a method for processing a fault according to claim 6 is recorded.

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