KR102049587B1 - 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 for processing an application server failure in a terminating network, a method therefor, and a computer readable recording medium on which the method is recorded. When the session connection request message is received, the session connection request message should be delivered to the application server AS in order to trigger to provide an additional service to the user device. At this time, if there is a failure in the application server (AS), the service control device (S-CSCF) transmits a session connection request message to the media gateway (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 delivers it to the circuit switched network. Accordingly, entities providing call processing and supplementary services in the circuit-switched network normally provide supplementary services and proceed with call processing. As described above, the present invention can normally provide a call processing procedure and an additional service even when a failure occurs in the application server of the destination network, thereby increasing the reliability of the service.

Description

Apparatus for handling Application Server failure in called network, method approximately and computer recordable medium storing the method

The present invention relates to a network failure processing technology, and more particularly, when a failure occurs in an entity for providing an additional service in an incoming network, an apparatus for providing an additional service and a call connection procedure normally, a method therefor, and the same A method relates to a computer readable recording medium having recorded thereon.

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

All multimedia services can be provided through the existing Internet connection, but this is limited to the best-effort service. However, the quality of the session can be guaranteed by performing resource allocation for the session through IMS. IMS also enables proper charging for sessions. It is possible to provide an appropriate charging method according to the type and quality of the service, the characteristics of the user, the policies of the network operator and the service provider, rather than the charge based on the flat fee or the packet volume. In addition, IMS can easily create new services through open interface protocols and provides an environment for creating new services by combining with existing services. The characteristics of IMS, which provide both network operators and service providers with control and billing capabilities for services, and provide users with the means to perform all their services while roaming, as well as on their home networks, This is why the defined IMS is becoming the basic control platform in the all IP based wired / wireless integration environment.

Registered Korean Patent No. 0955740, Aug 06, 2010 (Name: Handover method and apparatus in heterogeneous wireless communication network)

An object of the present invention is an apparatus for processing a failure to provide a supplementary service with a call connection procedure when a failure occurs in the application server (AS, Application Server) for providing an additional service in the incoming network, a method and This method provides a recorded computer readable recording medium.

According to an embodiment of the present invention, there is provided a service control apparatus for failure processing, including: an interface module for transmitting and receiving messages; And when receiving a session connection request message from a user device through the interface module, and confirms a failure of an application server, the media gateway converts the session connection request message into a call connection request message and transmits the message to the circuit switched network. And a control module for transmitting the session connection request message to the media gateway through the controller.

According to a preferred embodiment of the present invention, there is provided a method for processing a failure of a service control apparatus according to an embodiment of the present invention. And if the application server fails, transmitting a session connection request message to the media gateway so that a media gateway converts the session connection request message into a call connection request message and transmits the session connection request message to a circuit switched network.

According to the present invention, when the service control device (S-CSCF) of the called party receives a session connection request message from the calling user device, if there is a failure in the application server (AS), the circuit switch and the additional service providing device of the circuit switched network. Provide additional services and call connection procedures. As described above, the present invention can process the call processing procedure normally even when a failure occurs in the application server (AS) of the incoming network, thereby increasing the reliability of the service.

1 is a view for explaining the 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 device according to an exemplary 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 failure processing method according to an exemplary embodiment of the present invention.
5A through 5E are flowcharts illustrating a failure occurrence checking method according to an exemplary embodiment of the present invention.
6 is a flowchart illustrating a failure handling method of a service control apparatus according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. However, in describing in detail the operating principle of the preferred embodiment of the present invention, if it is determined that the detailed description of the related known functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

1 is a view for explaining the 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, Application Server, 700). In particular, the CSCF server includes a proxy control device (P-CSCF, Proxy Call State Control Function, 300), a connection control device (I-CSCF, Interrogating Call State Control Function, 400), and a service control device (S-CSCF, Serving Call). State Control Function, 500). Here, the CSCF server may be 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) are implemented as one device. Can be. 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 terminating network 20, a configuration of a circuit switching network is shown. This includes a media gateway (MGW, Media Gateway, 800), a circuit switch (MSC, Mobile Switching Center) and the value-added service providing apparatus 910.

The switching device 200 transmits a message received from the user device 100 to any one of the plurality of proxy control devices 300. Here, the message may be a Session Initiation Protocol (SIP) message. For example, the switching device 200 may be an L4 (layer 4, transport layer) switch. The switching device 200 has a distribution rule for distributing a number of messages received from each of the plurality of user devices 100 so that the load on the plurality of proxy control devices 300 is distributed. The switching device 200 transmits the message received from the specific user device 100 to the specific proxy control device 300 according to the distribution rule.

The CSCF server may perform basic functions for SIP-based session control such as subscriber registration, authentication, additional service provision, routing, various call control, address handling, and the like.

The proxy control device 300 is the first point at which the user device 100 accesses the IMS. When the registration request (REGISTER) message is transmitted from the user device 100, the proxy control device 300 may transmit it to the connection control device 400. When the proxy control apparatus 300 stores the address of the service control apparatus 500 assigned to the user apparatus 100 in the process of processing the registration request message, and receives a session connection request (INVITE) message from the user apparatus 100, This may be transmitted to the stored service control apparatus 500 as an address.

The connection control device 400 registers the location of the user device 100 in the home subscriber server 600 in the process of registering a user, that is, a subscriber, of the user device 100. In addition, the connection control device 400 obtains an address list of the service control device 500 available from the home subscriber server 600, and refers to the service control device to be assigned to the user device 100 to perform actual registration. 500 may be determined. Alternatively, the connection control device 400 receives a message including the address of the service control device 500 assigned to the user device 100 from the home subscriber server 600, and performs a service for actual registration according to this message. The control device 500 can be determined.

When the registration request message is received from the connection control device 400, the service control device 500 may register a subscriber with the home subscriber server 600 and obtain a profile from the home subscriber server 600. The service control device 500 may identify the type of additional service to be provided to the user device 100 using the profile. In addition, the service control device 500 connects the application server 700 to exchange messages between the user device 100 and the application server 700 so as to provide an additional service to the user device 100. In addition, the service control apparatus 500 may obtain and manage authentication information, that is, an authentication vector (AV) from the home subscriber server 600. In addition, the service control device 500 authenticates the user using AV (authentication vector).

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

The application server 700 is an equipment for providing an additional service and may communicate with the service control apparatus 500 using SIP. Examples of supplementary services include calling number related services (CLIP, CLIR, etc.), call waiting, call holding, push-to-talk, call forwarding, call forwarding, call closure service, malicious calling number, legal interception, service announcement, Services include conference call services, voice mail, text and voice conversion, location-based services, SMS, MMS, presence information, and instant messaging.

The media gateway 800 provides signaling conversion between the packet switched network and the circuit switched network. Signaling conversion means converting a format between a protocol of a message used in a packet switched network and a protocol of a message used in a circuit switched network. For example, conversion is performed between a Session Initiation Protocol (SIP) message and an Integrated Services Digital Network (ISDN) User Part (ISP) message. To this end, the media gateway 800 has a protocol conversion function for interworking a packet switched network and a circuit switched network.

When the user device 100 is connected to the circuit-switching network, the circuit exchanger 900 interworks with a home location register (HLR) or a home subscriber server 600 for the connected user device 100. Performs authentication and registers the authenticated user device 100 with the location. In addition, the circuit switch 900 performs a call connection procedure by downloading a profile from a home location register (not shown) or a home subscriber server 600 when a user is provided with a service in a circuit switched network. In step 910, additional service processing is performed. It should be noted that the home location register and the home subscriber server 600 may be implemented as a single device in which the home location register is merged with the home subscriber server 600 or may be separately implemented. If implemented as one, the entities of the circuit-switched network, in particular the circuit-switched 900, should also be able to access the home subscriber server 600. When the home location register and the home subscriber server 600 are implemented separately, the user's profile stored in the home location register and the home subscriber server 600 should be synchronized.

The supplementary service providing apparatus 910 collectively refers to entities on a circuit-switching network for providing various supplementary services, and the supplementary service providing apparatus 910 may be implemented as one or more apparatuses. Such additional services may include services such as a missed call number, individual call rejection, call notification, coloring-back tone, and voice message. The missed call number providing service provides the receiver with the telephone number of the unreceived caller when the caller attempts to connect the call while the called party cannot call. Private call rejection service restricts call connection of specific caller. When the called party is busy, the callable notification service is an additional service that informs the caller that the called party can be called when the called party becomes available. The coloring back tone service is a service that provides a multimedia file as a ring back tone instead of the ring tone of a general tone method. The voice message service is a service for providing a caller's voice message to the called party.

According to an embodiment of the present invention, the service control device 500 receives and stores a profile from the home subscriber server 600 including a list of additional services subscribed to by the user device 100 in a registration procedure. When the service control device 500 receives the session connection request (INVITE) message from the user device 100, the service control device 500 sends the session connection request (INVITE) message to the application server 700 to perform an additional service through the stored profile. Forward to 700. Therefore, the application server 700 receiving the session connection request message provides the additional service subscribed to by the user device 100. A method of providing an additional service by the application server 700 will be described with reference to the coloring back tone service as follows. Assume that the called user device which will receive the last session connection request message is subscribed to the coloring back tone 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 back tone and the calling user device, and the media device substitutes the coloring back tone instead of the usual ring back tone. Control a series of procedures to send a

However, the present invention assumes a situation where a failure occurs in the application server 700 of the incoming network. In this case, the service control device 500 transmits the session connection request message to the media gateway 800. Then, the media gateway 800 converts the session connection request (INVITE) message according to the SIP into a call connection request (IAM) message according to the ISUP, and then transfers the call connection request message to the circuit switch 900. do. Then, the circuit switch 900 provides a call connection procedure and may provide an additional service to the user device 100 in cooperation with the additional service providing device 910. As described above, the present invention can normally proceed with a call processing procedure even when a network failure occurs, and can also provide an additional service normally, thereby increasing the reliability of the service.

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

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

The communication unit 110 performs a function of transmitting and receiving a signal by a wireless communication method. Such a message may include a message according to an embodiment of the present invention. To this end, the communication unit 110 may include a transmitter for up-converting and amplifying a frequency of a transmitted signal, a receiver for low noise amplifying (LNA) and a down-converting frequency of a received signal. In particular, the communication unit 110 may perform communication according to a plurality of bands. For example, the communication unit 110 may include a transmitter and a receiver for communicating through a circuit switched network according to a 3G band and a transmitter and a receiver for communicating through a packet switched network according to a VoLTE band. The communication unit 110 may receive a 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 to the 3G band or the VoLTE band.

The input unit 120 receives a key operation of a user for controlling the user device 100, generates an input signal, and transmits the generated 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 in the touch screen.

The display unit 130 may be formed of a liquid crystal display (LCD), organic light emitting diodes (OLEDs), active matrix organic light emitting diodes (AMOLEDs), and the like. A menu, input data, function setting information, and various other information of the device 100 are visually provided to the user. The display unit 130 outputs a boot screen, a standby screen, a menu screen, and other application screens of the user device 100. When the display unit 130 is formed of a touch screen, the functions of various keys of the input unit 120 may be performed through the touch screen, and when the entire function may be performed only by the touch screen, the input unit 120 may be omitted. have.

The storage 140 stores a program and data necessary for the operation of the user device 100, and may 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 in which user data generated according to the use of the user device 100 is stored. In addition, the storage 140 may store various types of data generated according to the user's use of the user device 100. Various data stored in the storage 140 may be deleted, changed, or added according to a user's manipulation.

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

The controller 150 generates a Session Initiation Protocol (SIP) message transmitted or received through the packet switched network or an Integrated Services Digital Network (ISDN) User Part (ISP) message transmitted and received through the circuit switched network, and transmits the same through the communication unit 110. Can be. In addition, the controller 150 receives the SIP message or the ISUP message through the communication unit 110, and performs the necessary operation according to the received message. Accordingly, according to the exemplary embodiment of the present invention, the controller 150 may provide a 3G or VoLTE type 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.

Referring to FIG. 3, the 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 the proxy control device 300, the connection control device 400, and the home subscriber. The message may be sent to the server 600.

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

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

When the service control device 500 is located in the called network, the control module 530 may receive a session connection request message transmitted by the calling user device located in the calling network through the interface module 510. Then, the control module 530 checks the profile stored in the storage module 520 to confirm the additional service subscribed to by the called user device. 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 transmits the session connection request message to the media gateway 800 through the interface module 510. Then, the media gateway 800 converts the Session Connection Request (INVITE) message according to the SIP into the Call Connection Request (IAM) message according to the ISUP, and then transfers the call connection request message to the circuit switch 900. Accordingly, the circuit switch 900 provides a call connection procedure and will provide the supplementary service to the user device 100 in association with the supplementary service providing apparatus 910.

In the meantime, a method of identifying a failure of the application server 700 will be described below. According to an 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 notification message indicating a failure or if no message is received for a preset time, recognizes that the application server 700 has failed. . According to another embodiment, the control module 530 may transmit a failure confirmation message to the application server 700 periodically to query whether the failure is via the interface module 510. When the control module 530 receives a failure status response message including an indicator indicating that a failure has occurred in response to the failure confirmation message through the interface module 510, the control module 530 recognizes that the failure occurs in the application server 700. According to another embodiment, when a failure occurs, the application server 700 transmits a failure occurrence notification message indicating the failure to the service control device 500. Accordingly, the control module 530 recognizes that the application server 700 has a failure.

4 is a flowchart illustrating a failure processing method according to an exemplary embodiment of the present invention. In this embodiment, it is assumed that the first user device 101 of the calling network wants to connect a session to the second user device 102 of the called network. The first service control device 501 is located in the calling network, and the second service control device 502 is located in the called network.

Referring to FIG. 4, in operation S110, the first user device 101 transmits a session connection request message for requesting a session connection with the second user device 102. The session connection request message may be an INVITE message according to SIP. The session connection request message includes identification information of the first user device 101 that originally sent the message and 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 allocated to the first user apparatus 100 in step S115.

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

When registering the second user device 102, the second service control device 502 queries the home subscriber server 600 to receive the service profile of the user device 100 from the home subscriber server 600. Accordingly, the additional service subscribed to by the second user device 102 can be known. Therefore, when the second service control device 502 receives the session connection request message from the first user device 101, the second service control device 502 confirms the additional service subscribed to by the second user device 102 described as the called party in the session connection request message. Then, the session connection request message should be delivered to the application server 700 providing the additional service.

However, it is assumed that a failure occurs in the application server 700 in step S130. In this case, the second service control device 502 may check the failure of the application server 700 in step S135. According to an embodiment of the present invention, the second service control device 502 may identify the failure of the application server 700 in various ways. How to identify the failure of such an application server 700 will be described in more detail below.

In operation S140, the second service control device 502 confirming the occurrence of the failure transmits the session connection request message to the media gateway 800. The media gateway 800 converts the SIP message into an Integrated Services Digital Network (ISDN) User Part (ISP) message, or converts the ISUP message into a SIP message. Accordingly, the media gateway 800 converts an INVITE message, which is a session connection request message, into an initial address message (IAM) message. Then, the media gateway 800 delivers the call connection request message to the circuit switch 900 in step S145. When the circuit switch 900 receives the call connection request (IAM) message, the circuit switch 900 may check the additional service subscribed to by the second user device 102, and provide the additional service in cooperation with the additional service providing device 910. . In addition, the circuit switch 900 transmits a call connection request message to the second user device 102 in step S150. Thereafter, the second user device 102 that has received the call connection request message will perform a subsequent call connection procedure with 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 additional services can be provided normally, thereby increasing the reliability of the service.

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

4 and 5A according to the first embodiment, it is assumed that a failure occurs in the application server 700 in step S130. In this case, the second service control device 502 transmits the session connection request message received from the connection control device 400 to the application server 700 in step S210.

In operation S215, the application server 700 receiving the session connection request message transmits a failure occurrence notification message to the second service control device 502 indicating the failure. According to the SIP, the failure occurrence notification message may be a 503 Service Unavailable message or a 504 Server Timeout message. Here, the 503 Service Unavailable message is transmitted when a request cannot be processed normally. In addition, a 504 Server Timeout message is sent if the application server 700 cannot process the request within the time limit. Accordingly, the second service control device 502 may recognize the occurrence of the failure of the application server 700.

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

It is assumed that a failure occurs and the application server 700 cannot transmit any message. Therefore, the second service control device 502 may not receive any message from the application server 700 within the preset time T.

Therefore, after transmitting the session connection request message, the second service control device 502 counts the preset time T, and if the second service control device 502 does not receive any message until step S225 after the preset time T has elapsed, It is determined that a failure occurs in the application server 700.

According to SIP, SIP messages exchange messages in a handshaking manner consisting of request and response. For example, when a session connection request (INVITE) message is received, a session connection acceptance (200 OK) message is transmitted in response thereto. In addition, the SIP messages transmit acknowledgment messages indicating that the message has been received separately from the response message to the request. That is, the entity that receives the session connection request (INVITE) message should transmit an acknowledgment (ACK) message confirming that the message has been received to the entity that sent the session connection request (INVITE) message. In consideration of this, when the second service control device 502 does not receive an acknowledgment (ACK) message from the application server 700 within a preset time, it may determine that the application server 700 has failed.

Referring to FIG. 4 and FIG. 5C according to the third embodiment, the second service control device 502 periodically transmits a failure check message to the application server 700 to query whether a failure occurs, and according to the response. You can check whether there is an obstacle. That is, the second service control device 502 may transmit a failure check message in step S240 according to the transmission period (F) of the failure check message after transmitting the failure check message in step S230.

Since the application server 700 that has received the failure check message in step S230 does not cause a failure, when transmitting a failure response message in step S235, the application server 700 may include an indicator indicating that it is operating normally. 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 the failure occurred in the failure status response message. In operation S245, the application server 700 transmits a failure status response message including the indicator to the second service control device 502. Accordingly, the second service control device 502 may recognize the occurrence of the failure of the application server 700.

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

Since the application server 700 receives the failure check message in step S250, since the failure does not occur, the application server 700 may include an indicator indicating that it is operating normally when transmitting the failure check response message in step S255. On the other hand, it is assumed that a failure occurs in the application server 700 in step S130, the application server 700 can not transmit any message due to the failure.

In this case, the second service control device 502 transmits a failure check message after waiting for one period (F) again after transmitting the failure check message in step S260. However, if the second service control device 502 does not receive any message before the next cycle (F) after transmitting the failure confirmation message in step S260, it is determined that the failure in the application server 700 do. That is, if the second service control device 502 transmits a failure confirmation message in step S260 and does not receive any message before step S265, which is one cycle F thereafter, the second service control device 502 determines that a failure occurs in the application server 700. do.

4E and 5E according to the fifth embodiment, it is assumed that a failure occurs in the application server 700 in step S130. In this case, the application server 700 transmits to the second service control device 502 a failure occurrence notification message indicating a failure in operation S270. Accordingly, when the second service control device 502 receives a failure occurrence notification message indicating a failure occurrence generated by the application server 700, the second service control device 502 may recognize the failure of the application server 700.

6 is a flowchart illustrating a failure handling method of a service control apparatus according to an embodiment of the present invention. This embodiment is described with respect to the failure handling method of the second service control device 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 operation S310. The session connection request message includes identification information of the first user device 101 as the originator and identification information of the second user device 102 as the called party.

The control module 530 checks whether the second user device 102 to receive the session connection request message is subscribed to the additional service in step S320. The control module 530 may receive a profile from the home subscriber server 600 through the interface module 510 while the second user device 102 registers with the called network. This profile includes a list of supplementary services subscribed to by the user of the second user device 102. This profile is stored in the storage module 520 until the second user device 102 unregisters it. Therefore, upon receiving the session connection request message, the control module 530 may check whether the second user device 102 is subscribed to the additional service through a pre-stored profile.

As a result of checking in step S320, when the second user device 102 is not subscribed to the additional service, the control module 530 transmits a session connection request message to the proxy control device 300 of the called network in step S330. Here, the proxy control device 300 is located in the called network and assigned to the second user device 102 in the registration procedure. Accordingly, the proxy control device 300 may transmit a session connection request message to the second user device 102.

As a result of checking in step S320, when the second user device 102 subscribes to the additional service, the control module 530 proceeds to step S340. In operation S340, the control module 530 determines whether a failure occurs in the application server 700 that provides the additional service. The method of determining the occurrence of a failure is as described above with reference to FIGS. 5A to 5E.

As a result of the determination in step S340, when a failure occurs in the application server 700, the control module 530 proceeds to step S350. In operation S350, the control module 530 transmits a session connection request message to the media gateway 800. The media gateway 800 will convert the Session Connection Request (INVITE) message according to the SIP into the Call Connection Request (IAM) message according to the ISUP, and forward the converted call connection request message to the circuit switch 900. Accordingly, the circuit switch 900 may interwork with the supplementary service providing apparatus 910 or provide the supplementary service by the circuit switch 900 alone. In addition, the circuit switch 900 forwards the received call connection request (IAM) to the second user device 102, so that the call connection procedure can proceed normally.

As a result of the determination in step S340, when a failure does not occur in the application server 700, the control module 530 proceeds to step S360. In operation S360, the control module 530 may transfer the session connection request message received from the connection control device 400 to the application server 700. Accordingly, the application server 700 may provide an additional service to the second user device 102.

The failure processing method according to the 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. In this case, a computer-readable medium suitable for storing computer program instructions and data may include, for example, a magnetic medium such as a hard disk, a floppy disk, and a magnetic tape, and a compact disk read only memory (CD-ROM). , Optical media such as Digital Video Disk (DVD), magneto-optical media such as Floppy Disk, and ROM (Read Only Memory), RAM And a semiconductor memory such as a random access memory, a flash memory, an erasable programmable ROM (EPROM), and an electrically erasable programmable ROM (EEPROM). The processor and memory can be supplemented by or integrated with special purpose logic circuitry. Examples of program instructions may include high-level language code that can be executed by a computer using an interpreter as well as machine code such as produced by a compiler. Such hardware devices may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

Although the specification includes numerous specific implementation details, these should not be construed as limiting to any invention or the scope of the claims, but rather as a description of features that may be specific to a particular embodiment of a particular invention. It must be understood. Certain features that are described in this specification in the context of separate embodiments may be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments individually or in any suitable subcombination. Furthermore, while the features may operate in a particular combination and may be initially depicted as so claimed, one or more features from the claimed combination may in some cases be excluded from the combination, the claimed combination being a subcombination Or a combination of subcombinations.

Likewise, although the operations are depicted in the drawings in a specific order, it should not be understood that such operations must be performed in the specific order or sequential order shown in order to obtain desirable results or that all illustrated operations must be performed. In certain cases, multitasking and parallel processing may be advantageous. Moreover, 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 that it can.

On the other hand, the embodiments of the present invention disclosed in the specification and drawings are merely presented specific examples for clarity and are not intended to limit the scope of the present invention. It is apparent to those skilled in the art that other modifications based on the technical idea of the present invention can be carried out in addition to the embodiments disclosed herein.

The present invention relates to an apparatus for processing an application server failure of a terminating 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 should be delivered to the application server (AS) in order to trigger to provide the additional service to the user device. At this time, if there is a failure in the application server (AS), the service control device (S-CSCF) transmits a session connection request message to the media gateway (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 delivers it to the circuit switched network. Accordingly, entities providing call processing and supplementary services in the circuit-switched network normally provide supplementary services and proceed with call processing. As described above, the present invention can normally provide a call processing procedure and an additional service even when a failure occurs in the application server (AS) of the incoming network, thereby increasing the reliability of the service. This has industrial applicability because it is not only sufficient marketable or business possibility, but also practically evident.

100: user device (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 switched (MSC) 910: additional service providing device

Claims (7)

An interface module for transmitting and receiving messages; And
When the session connection request message is received from the user device through the interface module, if a failure of the application server is confirmed, a media gateway connects the session connection request message to the call gateway to provide at least one of a call connection procedure and an additional service. And a control module for transmitting the session connection request message to the media gateway to convert the request message to the circuit switching network. The method of claim 1,
The session connection request message is an INVITE message according to a session initiation protocol (SIP), and the call connection request message is an IAM (Initial Address Message) message according to an Integrated Services Digital Network (ISDN) User Part (ISP). Service control unit for fault handling. The method of claim 1,
The control module
The session connection request message is transmitted to the application server through the interface module, and in response to the transmitted session connection request message, a failure notification message indicating a failure occurrence is received or no message is received for a preset time. If not, the service control device for failure processing, characterized in that for identifying the failure of the application server. The method of claim 1,
The control module
Periodically transmits a failure confirmation message to the application server for querying failure through the interface module, and receives a failure response message including an indicator indicating that a failure has occurred in response to the transmitted failure confirmation message; And if no message is received before the next cycle arrives, identifying the failure of the application server. The method of claim 1,
The control module
And a failure occurrence notification message indicating a failure occurrence of the failure generated by the application server, and identifying the failure of the application server. When the service control device receives the session connection request message, checking whether the application server has a failure; And
In order to normally provide at least one of a call connection procedure and an additional service if the application server has a failure, the service control apparatus converts the session connection request message into a call connection request message through a media gateway and transmits the session connection request message to a circuit switched network. Sending a connection request message to the media gateway;
Method for failure processing of the service control device comprising a. A computer-readable recording medium having recorded thereon a method for handling faults according to claim 6.

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