KR20110070389A - Method and apparatus for providing vcc services between heterogeneity communication network based on ims - Google Patents

Abstract

PURPOSE: A successive voice call service providing method and apparatus between heterogeneous communication networks on the basis of IMS(IP Multimedia Subsystem) are provided to simultaneously perform handover processing between Wibro network and WCDMA network for a VCC terminal and network switching processing through VCC service processing. CONSTITUTION: An MSC(Mobile Switching Center) advances re-arrangement and handover with a corresponding target BS(Base Station)(S20). The MSC induces a session changing procedure(S30). A VCC(Voice Call Continuity) application server advances session switching and updating, and the session cancellation of a Wibro(Wireless broadband) communication network(S40). The MSC transmits a network switching and handover complete response signal to a Wibro control station(S50). The MSC requests home location registration according to handover and location registration updating to the home location management node of a WCDMA(Wideband Code Division Multiple Access) communication network(S60).

Description

Method and apparatus for providing continuous voice call service between IMS-based heterogeneous communication networks {Method and apparatus for providing VCC services between heterogeneity communication network based on IMS}

The present invention relates to a communication network system supporting IMS-based VoIP, and more particularly, to a method and apparatus for providing a continuous voice call (VCC) service between different heterogeneous communication networks.

In recent years, mobile communication services have responded to the rapid development of mobile communication technology and Internet technologies and various demands of users, and thus, high speed packet data capable of transmitting large amounts of digital data as well as e-mail or still images to mobile communication terminals as well as existing voice call services. It is approaching the stage of providing the service. Accordingly, mobile communication systems are evolving from voice-based circuit switched (CS) domains to packet-based packet switched (PS) domains.

In addition, the core network (CN) for providing multimedia services through the Internet is being converted from a conventional circuit-based CN to a packet-based CN, and further evolving into an IP-based CN. A communication system that provides IP multimedia services to users through such an IP-based CN is called IMS (IP Multimedia Subsystem), and 3GPP / 3GPP2 conducts various studies to provide ALL IP services through such IMS. have.

Here, the circuit switched (CS) method is used for a typical voice service and a real time service, and means a method of forming a circuit-based fixed call path between one user and another user. In addition, IMS uses a packet-switched (PS) -based unfixed call path based on the Internet Protocol (IP), which improves transmission efficiency and ensures reliability, making it suitable for data services, messaging services, and file transfer services. That's the way. This IMS has the advantage of supporting not only simple one-to-one call but also a connection involving a large number of users.

In addition, Voice Call Continuity (VCC) service is a proposed technology for moving voice calls between circuit-switched networks and packet-switched networks (or IMS networks) through domain (telecommunications network) switching. It is provided to users who subscribe to the VCC service. In addition, a UE that supports both a circuit switched network voice call and an IMS session and enables network switching (domain change) without disconnecting the voice call between the circuit switched network and the IMS network is called a VCC terminal.

Furthermore, the voice call request transmitted from or to the VCC service user is transmitted to the terminal through the circuit network or the IMS network. In addition, the VCC service provides domain switching to enable voice calls that are being serviced through the circuit network domain through the IMS network domain or to service voice calls that are being serviced through the IMS network domain through the circuit network domain. . In order to provide such a VCC service, the IMS system is provided with an application server (AS: Application Server) for the VCC service, and the VCC AS anchors the voice call transmitted from the circuit network and anchors the voice call transmitted from the IMS network domain. And domain conversion service.

In the VCC service, when a terminal receiving a voice call through the IMS network moves to an area where the IMS service is not supported, the terminal requests the VCC AS to move the voice call to the circuit network. On the contrary, when the terminal receiving the voice call through the circuit network moves to the area where the circuit network service is not supported or the circuit network service is supported and the IMS network service is supported at the same time, the terminal requests the VCC to move the voice call to the IMS network. Ask the AS. As such, moving a voice call to another network, that is, another domain, is called domain switching in VCC.

Currently, mobile communication systems are developing into heterogeneous communication systems integrating and operating heterogeneous networks such as circuit switched networks and packet switched networks (or IMS networks). In addition, the VCC service is classified into two functions. The first is domain selection of a called terminal, and the second is domain switching as described above.

As such, voice call processing between different heterogeneous communication networks supports both the network selection and the network switching between the circuit switched network and the packet switched network in the VCC. Recipient network selection and domain selection are functions for selecting an incoming call domain based on user preference, operator policy, terminal registration, and the like among the circuit network and packet network. In addition, network switching and domain switching mean that the user of the terminal supporting both the circuit switched network such as CDMA and WCDMA and the packet switched network such as IMS moves to the IMS in order to maintain a seamless voice call when moving between the circuit switched network and the packet switched network. It is a technology that converts a voice call between a circuit switched network and a packet switched network in a VCC system, which is an application server of a network.

However, since most VCC services perform all handover processing procedures between heterogeneous networks, network switching processing is performed at the VCC server according to a request from the terminal, so that the processing processes between the relevant nodes of the communication network system are duplicated. As a result, the load in the system is increased, and the entire VCC processing takes a lot of time.

In addition, the time point at which the handover process and the network switching process are performed does not coincide, and thus, the difference between the two networks has to be occupied by the time difference, which causes an overload while the user terminal accesses both communication networks. There is. This may cause a problem of occupying unnecessary radio resources and increasing battery consumption of the terminal.

Furthermore, since the VCC service from the Wibro communication network to the WCDMA communication network is not implemented in the currently developed or developing standard, there is a problem that it is difficult to clearly implement the service.

Accordingly, the present invention has been made to solve the above problems, and provides a method and apparatus for improving the overall VCC processing speed by simplifying the handover process between heterogeneous communication networks and network switching processing through the VCC service. The purpose is.

Another object of the present invention is to provide an improved method and apparatus for rapidly processing a VCC service for a terminal handing over from a Wibro network to a WCDMA network in an integrated network environment in which a Wibro network and a WCDMA network overlap.

Other objects and advantages of the invention will be described below and will be appreciated by the embodiments of the invention. Further, objects and advantages of the present invention can be realized by the means and the combination shown in the appended claims.

In order to achieve the above object, the continuous voice call service providing method between the IMS-based heterogeneous communication network according to the present invention, continuously provides a voice call service between the Wibro communication network and the WCDMA communication network supporting IMS-based VoIP A method comprising: (a) receiving a handover request from a user terminal at a Wibro network control station via a source base station; (b) determining, at the Wibro communication network control station, a handover from the packet network to the circuit network and requesting a network switch to a switching station of a target WCDMA communication network; (c) the WCDMA telecommunication switching center performing relocation and handover processing with a target base station of a handover target; (d) instructing the WCDMA communication network to instruct a VCC server to start voice call session switching, inducing a session switching and updating process to a WCDMA communication network and a session release processing of a Wibro network; (e) transmitting a response to a network switching process from the WCDMA network switching station to the Wibro network control station; And (f) the Wibro communication network control station transmitting a response to the handover process to the user terminal via the source base station.

According to another aspect of the present invention, a WCDMA network switching center device for continuously providing a voice call service between a Wibro communication network and a WCDMA communication network supporting IMS-based VoIP, interworking with the Wibro network switching center, WCDMA of the user terminal of the Wibro network A network switch request receiving module for receiving a network switch request according to voice call handover to a communication network; A handover processing module configured to perform relocation and handover processing for the WCDMA target base station and the user terminal to be handed over when receiving a network switching request from the Wibro communication network to the WCDMA communication network; And interworking with an IMS-based VCC server, instructing the VCC server to start voice call session switching at the same time as the handover processing from the handover processing module to the user terminal, and converting a session from a Wibro communication network to a WCDMA communication network. A continuous voice call service providing apparatus is provided between an IMS-based heterogeneous communication network, including a VCC interworking module for inducing update processing and session release processing of a Wibro communication network.

According to the present invention, by implementing the handover process of the inter-network communication (Wibro-WCDMA) and VCC service processing for the VCC terminal at the same time, to simplify the signal processing between each node of the communication system and overall VCC processing speed can also be greatly improved.

In addition, since handover processing between heterogeneous communication networks and network switching processing according to the VCC service are performed at the same time, the user terminal occupies only one communication network at any one time, thereby reducing the load of the terminal and reducing battery consumption during handover and VCC services. Provides the effect of minimizing

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as having a conventional or dictionary meaning, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

1 is a diagram illustrating a configuration of a Wibro-WCDMA integrated network in which a continuous voice call service providing method is implemented between IMS-based heterogeneous communication networks according to an embodiment of the present invention.

Referring to FIG. 1, the Wibro-WCDMA integrated network has a WCDMA base station 150 connected to a WCDMA switching center 100 to form a WCDMA communication network coverage, and a Wibro base station 250 is connected to a Wibro control station 200. WiB communication network coverage is formed, and the WCDMA switching center 100 and the Wibro control station 200 are configured to be connected to the VCC application server 300 of the IMS network to provide a VCC service. In addition, the WCDMA switching center 100 and the Wibro control station 200 interoperate with each other to perform network switching processing according to the VCC service as well as heterogeneous network handover processing.

In addition, the user terminal 400 performs wireless communication with each other within the coverage of the WCDMA base station 150 or the Wibro base station 250 of the Wibro-WCDMA integrated network. That is, when the user terminal 400 is located within the coverage of the Wibro base station 250, the user terminal 400 wirelessly connects to the Wibro communication network and performs communication. When the user terminal 400 is located within the coverage of the WCDMA base station 150, the user terminal 400 wirelessly connects to the WCDMA communication network. Will be performed. In addition, the coverage of the Wibro communication network is generally included in the coverage of the WCDMA communication network. In addition, since data communication or data communication based VoIP communication is advantageous to use a data network based Wibro communication network, it is preferable to induce connection to the Wibro communication network in an area where the Wibro communication network and the WCDMA communication network overlap.

The WCDMA mobile switching center (MSC) 100 performs a circuit switching process of a WCDMA network, performs a handover process with another communication network and a network switching process through a VCC server in association with a Wibro communication network. To this end, the WCDMA switching center 100 is interlocked with the control station 200 of the Wibro communication network.

The WCDMA Radio Network Controller (RNC) 150 performs direct wireless communication with the user terminal 402 within a coverage range in a WCDMA manner. In addition, the WCDMA base station 150 may be classified into a base station controller (wireless network controller) and a base station. The user terminal 400 is wirelessly connected to the base station, and is connected to the switching center 100 through a base station controller.

The Wibro Access Control Router (ACR) 200 performs packet exchange processing and IP routing processing of the Wibro network, and performs handover processing with other communication networks and network switching processing through a VCC server in connection with a WCDMA communication network. To perform. To this end, the Wibro control station 200 interlocks with the switching center 100 of the WCDMA communication network.

The Wibro Radio Access Station (RAS) 250 performs direct wireless communication with the user terminal 401 within a coverage range in a Wibro manner. In addition, the Wibro base station 250 is connected to the Wibro control station 150 to connect the user terminal to the Wibro communication network.

The VCC application server 300 is an application server that serves to continuously provide VoIP communication, that is, IP-based voice call communication, to a server device included in the IMS network.

As such, in the IMS network, a service continuity technology is included, which is called IMS Service Continuity, and provides a continuity of data so that a service that a user is using between different networks and devices is not interrupted while moving. As the network has evolved from circuit-switched network to packet-switched network, discussions have been made on technical standards for continuously providing voice call services provided in existing networks in packet networks. Recently, IPTV, Mobile TV, Triple_Play services as well as voice services have been discussed. With the advent of the market, the market demand for providing continuity of real-time data and multimedia services has arisen. In order to enable this, in 3GPP, standardization for transferring sessions between different devices in the same network as well as for transferring sessions between different devices in the same network is progressing as a task called IMS Service Continuity.

Among the technologies of the IMS network, technologies related to service continuity can be broadly classified into network switching and device switching. Network switching technology is a technology for delivering a session so that there is no disconnection between different networks in the same terminal device. Representative standard technology of the network switching technology is the Voice Call Continuity (VCC) technology that supports the continuity of voice call service when the terminal is moved between the existing circuit switched network and the packet switched network. In addition, technical standards such as CS fallback of 3GPP and Media Independent Handover (MIH) of IEEE are established. The VCC specification of 3GPP was completed at the end of 2006, but due to the limitation of session delivery for voice call only, IMS Service Continuity standardization was supported to improve this by supporting data and multimedia session delivery.

In addition, the device switching technology is a technology for transferring sessions between different terminal devices in the same network. Service-to-device continuity is currently being standardized in 3GPP Rel-9. When the device switching technology standard is established, users can transfer sessions between mobile phones and PCs or between mobile phones and IPTVs, so that users can receive voice and continuous data services. In addition, sessions will be delivered between mobile phones and on-vehicle devices, allowing users to experience more advanced services by providing seamless multimedia services regardless of location and device.

IMS-based services as described above are provided not only through packet switched network but also through circuit switched network. Especially, when using circuit switched network, it is provided through IMS Centralization Services (ICS) solution defined in 3GPP TS23.292. It is standardized in TS23.237. The delivery of the session for the IMS Service Continuity is initiated by the user terminal and controlled through the SCC AS (Secure Centralization and Continuity Application Server). SCC AS is connected to the IMS network and performs a function of delivering a multimedia session to an application server that plays an important role in supporting service continuity between different wireless networks and processes a plurality of media flows. The information transferred between the SCC AC and the user terminal includes a session transfer indicator, a session transfer number, a media flow to be transmitted, an IMS communication service identifier, and session information to be updated. A wireless access network capable of delivering a session is defined by an operation policy based on the OMA device manager and decides whether to deliver a media flow for the access network having a priority.

As such, the VCC application server 300 is included in the IMS-based SCC AS, and supports network switching and continuous service for voice calls. In addition, the VCC application server 300 is connected to the WCDMA switching center 100 and the Wibro control station 200 to interwork with the WCDMA communication network and the Wibro communication network. Through this, network switching and session switching processing are performed according to a request from the switching center 100 or the control station 200. At this time, the service request and processing are performed according to the above-described standard in IMS Service Continuity.

The user terminal 400 is a VCC terminal device supporting a VCC service, and may include a mobile communication terminal, a mobile phone, a smart phone, a PDA phone, and the like that support a voice call. In addition, the user terminal 400 may be handed over from the Wibro communication network to the WCDMA communication network or from the WCDMA communication network to the Wibro communication network, and even during such handover, the user terminal 400 may receive a continuous voice call service through the VCC server.

2 is a diagram illustrating a configuration of an apparatus for providing a continuous voice call service between heterogeneous communication networks based on IMS according to an embodiment of the present invention.

Referring to the drawings, the continuous voice call service providing apparatus 100 according to the present invention is a WCDMA network switching center apparatus for continuously providing a voice call service between the Wibro communication network and the WCDMA communication network supporting IMS-based VoIP, In addition to the WCDMA network switching center configuration, the network switching request receiving module 110, the handover processing module 120, the VCC interworking module 130, and the like are included.

The network switching request receiving module 110 performs a role of receiving a request for handover processing and VCC network switching processing between communication networks in connection with a Wibro communication network and transmitting a response. The network switching request receiving module 110 includes a Wibro control station interworking unit 112, a request receiving unit 114, a response transmitting unit 116, and the like. The Wibro control station interworking unit 112 is configured to send and receive signals in association with a Wibro communication network, and in particular, is connected to the control station 200 of the Wibro communication network.

The request receiving unit 114 serves to receive a handover process and a network switching request for a user terminal moving from a Wibro communication network to a WCDMA communication network. The request receiving unit 114 receives a handover process and a network switching request from the Wibro control station 200 interworked through the Wibro control station interworking unit 112.

The response transmitting unit 116 transmits a response to handover processing and network switching processing for the user terminal moved from the Wibro communication network to the WCDMA communication network. The response transmitting unit 116 transmits a response to the request to the Wibro control station 200 interworked through the Wibro control station interworking unit 112.

The handover processing module 120 performs handover processing for the user terminal moved from the Wibro communication network to the WCDMA communication network. The handover processing module 120 includes a base station manager 122, a handover processor 124, a location registration processor 126, and the like.

The base station manager 122 manages the WCDMA base stations 150 connected to the switching center 100.

The handover processing unit 124 performs handover processing for a user terminal moved from a Wibro communication network to a WCDMA communication network, requests relocation and handover to a target base station to be handed over (Relocation / HO Request), relocation and Receive a response to the handover process.

When the location registration processing unit 126 receives the relocation and handover completion signal from the target base station, the location registration processing unit 126 performs location registration and location registration update processing for the location handed over to the home location management node of the WCDMA communication network.

The VCC interworking module 130 performs a network switching process or a session switching process in conjunction with an IMS-based VCC server to provide a VCC service (continuous voice call service) to a user terminal moving from a Wibro communication network to a WCDMA communication network. It performs the role of controlling to perform. The VCC interworking module 130 includes a VCC server interworking unit 132, a handover trigger processing unit 134, and a session switch instructing unit 136.

The VCC server interworking unit 132 performs a role of transmitting a control signal and an indication message in association with a VCC application server included in an IMS-based SCC AS. The VCC server interworking unit 132 supports standards and protocols that can be recognized by the IMS-based VCC server to transmit signals and messages.

The handover trigger processing unit 134 checks whether the handover processing from the Wibro communication network to the WCDMA communication network is performed by the handover processing module 120 to trigger a trigger when a handover occurs.

When the trigger is triggered by the handover trigger processing unit 134, the session switch instructor 136 transmits a session switch start instruction message for a voice call to the VCC server through the VCC server interworking unit 132. To perform. The session switching initiation message for the voice call may cause the VCC server to perform voice call session switching and updating processing from a Wibro communication network to a WCDMA communication network for the handovered user terminal and to perform a session release processing of the Wibro communication network. Signal message. In addition, the session switch start indication message uses a message according to ITU-T (International Telecommunication Union Telecommunication Standardization Sector) and 3GPP standards, for example, a session for transmitting an ISUP IAM (STN-SR) message to a VCC server. Can be used as a switch start indication message. Here, STN-SR means Session Transfer Number for SRVCC, and SRVCC means Single Radio VCC.

As a result, the user terminal moved from the Wibro communication network to the WCDMA communication network simultaneously performs handover and network switching (session switching) according to the VCC service. That is, at the same time as the handover process, the session switching start instruction message is transmitted to the IMS-based VCC application server to induce the VCC server to perform the session switching process and the update process and the process of releasing the existing session of the Wibro communication network. Thus, network switching is performed at the same time as handover.

Therefore, the entire procedure of handover and network switching processing is simplified, and the total time of handover and network switching processing for communication network movement is reduced, so that the VCC service can be processed quickly.

3 is a flowchart illustrating a processing procedure performed in an apparatus for providing continuous voice call service between heterogeneous communication networks based on IMS according to an embodiment of the present invention.

The operation of the continuous voice call service providing apparatus of the present invention will be described with reference to FIG. As shown in the figure, the apparatus of the present invention located in an exchange node of a WCDMA communication network is interworked with a Wibro control station to receive a network switching request from the Wibro control station. In this case, the procedure is performed for a user terminal requiring a handover and network switching according to a VCC service by moving from a Wibro communication network to a WCDMA communication network (S10).

When the network switching request is received, the switching center first searches for a target base station to be handed over to which the corresponding user terminal is located, and performs a relocation and handover process with the target base station (S20).

As such, when the handover is spelled, the exchange is triggered to trigger the handover to induce the session switching procedure. In this case, triggering is activated only for handover from the Wibro communication network to the WCDMA communication network (S30).

When the handover trigger is triggered, the exchange performs a procedure for generating and transmitting a voice call session switch start indication message to an interworking IMS-based VCC application server. At this time, the session switching initiation message for the voice call transmitted to the VCC server performs the voice call session switching processing from the Wibro base station and the control station before the network switching or handover of the user terminal to the WCDMA base station and the switching center after the network switching or handover. It is a message to start. As the voice call session switching start instruction message is transmitted, the session switching and updating process from the Wibro communication network to the WCDMA communication network and the session release processing of the Wibro communication network are performed in the VCC application server (S40).

Next, the switching center receives the handover completion message from the target base station, and recognizes that the handover and network switching are completed, and transmits the network switching and handover completion response signal to the Wibro communication network, that is, to the Wibro control station. (S50)

At the same time, the home location management node of the WCDMA communication network requests the home location registration and location registration update processing according to the handover to be processed. At this time, the home location management node may correspond to HSS or HLR.

Through this, handover processing from Wibro communication network to WCDMA communication network and network switching processing are performed at the same time, so that VCC processing can be performed at high speed.

4 is a flowchart illustrating a procedure of a method for providing a continuous voice call service between heterogeneous communication networks based on an IMS according to an embodiment of the present invention.

First, the embodiment of FIG. 4 is a procedure performed when a VCC user terminal in Wibro network coverage moves to WCDMA network coverage in an integrated network in which a Wibro network and a WCDMA network overlap.

Accordingly, the user terminal is located in the base station coverage of the Wibro communication network and moves to the base station coverage area of the WCDMA communication network. Accordingly, the user terminal determines to handover from the Wibro communication network to the WCDMA communication network, and proceeds with the procedure of transmitting a handover request signal to the Wibro base station. In this case, the neighbor list capable of handover is transmitted together with the handover request signal.

When the Wibro base station receives the handover request signal from the user terminal, the Wibro base station transmits the handover request signal to the Wibro control station according to the handover procedure. At this time, the handover request signal includes information such as BSID, CINR Mean, Naver List, etc. (2)

The Wibro control station receives the handover request, confirms that the requested handover is a handover from the Wibro communication network to the WCDMA communication network, and transmits a handover and network switching request to the switching station of the interworking WCDMA communication network. The network switching from the Wibro communication network to the WCDMA network is similar to the network switching request from the packet switched network to the circuit switched network.

When the WCDMA switching station to be handed over receives a handover and network switching request from the Wibro control station, the WCDMA base station that manages the target base station to be handed over is retrieved and the relocation and handover request signal is transmitted to the target base station. (4)

The WCDMA destination base station receiving the relocation and handover request signal proceeds to transmit a response signal for the relocation and handover request to the WCDMA switching center.

After receiving the response signal from the target base station, the WCDMA switching center performs a procedure of generating and transmitting a session switch start indication message for the voice call of the user terminal to the VCC server included in the interworking IMS-based SCC AS. In this case, the message transmitted to the VCC server is to use the message according to the ITU-T and 3GPP standards, from the Wibro base station and the control station before the handover or network switching of the user terminal to the WCDMA base station and switching station after the handover or network switching Create and send a message to switch the session for voice calls. Here, as shown in the figure, an example of transmitting a session switch number (STN-SR) for a single radio VCC included in the standard message is shown. Such a standard message may use an ISUP IAM message, and may transmit a message to a VCC server in a format such as ISUP IAM (STN-SR).

When the VCC server receives the session switching start instruction message for the voice call from the WCDMA switching center, the VCC server switches the session for the voice call of the user terminal handed over from the Wibro communication network to the WCDMA network and performs an update process according to the instruction message. (7)

In addition, the VCC server performs a procedure of releasing the IMS connection session established in the Wibro communication network before handover. Through this, a session is formed only in the WCDMA communication network after the handover, so that the dual session cannot be maintained.

As described above, the VCC server performs the procedure, and the WCDMA switching center transmits the response to the network switching request to the interworking Wibro control station.

After receiving the network switch processing response from the WCDMA switching station, the Wibro control station proceeds to transmit a handover response signal to the Wibro base station. In this case, the BSID and the HOID (handover identifier) are included in the response signal and transmitted.

The Wibro base station receives the handover response signal and transmits the handover response signal to the user terminal requesting the handover.

Upon receiving the handover response signal, the user terminal confirms that the handover process is being performed, and proceeds to the process of switching the mode to the WCDMA network.

The user terminal proceeds to confirm the handover with the WCDMA base station to which the handover process is performed after mode switching.

After the handover confirmation procedure with the user terminal, the WCDMA base station transmits a message indicating that the handover and relocation procedure is completed to the WCDMA switching center.

After receiving the handover complete message, the WCDMA switching center transmits a response signal indicating that the handover and network switching is completed to the interworking Wibro control station.

When the WCDMA switching center completes the handover process, the WCDMA home location management node performs a procedure for requesting the WCDMA home location management node to process the home location registration and location registration update according to the handover. This completes the overall handover and network switching process for (16).

Through such a procedure, the voice call session switching processing is performed simultaneously with the handover process for the user terminal moving from the Wibro communication network to the WCDMA communication network, thereby enabling faster VCC processing.

Although the present invention has been described above by means of limited embodiments and drawings, the present invention is not limited thereto and will be described below by the person skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of the claims.

The following drawings, which are attached to this specification, illustrate exemplary embodiments of the present invention, and together with the detailed description of the present invention serve to further understand the technical spirit of the present invention, the present invention includes matters described in such drawings. It should not be construed as limited to.

1 is a diagram illustrating a configuration of a Wibro-WCDMA integrated network in which a continuous voice call service providing method is implemented between IMS-based heterogeneous communication networks according to an embodiment of the present invention.

2 is a diagram illustrating a configuration of an apparatus for providing a continuous voice call service between heterogeneous communication networks based on IMS according to an embodiment of the present invention.

3 is a flowchart illustrating a processing procedure performed in an apparatus for providing continuous voice call service between heterogeneous communication networks based on IMS according to an embodiment of the present invention.

4 is a flowchart illustrating a procedure of a method for providing a continuous voice call service between heterogeneous communication networks based on an IMS according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

100: switching center 150: WCDMA base station

200: control station 250: Wibro base station

300: VCC server 400: user terminal

Claims (14)

A method for continuously providing a voice call service between a Wibro network and a WCDMA network supporting IMS-based VoIP, (a) receiving a handover request from a user terminal via a source base station at a Wibro network control station; (b) determining, at the Wibro communication network control station, a handover from the packet network to the circuit network and requesting a network switch to a switching station of a target WCDMA communication network; (c) the WCDMA telecommunication switching center performing relocation and handover processing with a target base station of a handover target; (d) instructing the WCDMA communication network to instruct a VCC server to start voice call session switching, inducing a session switching and updating process to a WCDMA communication network and a session release processing of a Wibro network; (e) transmitting a response to a network switching process from the WCDMA network switching station to the Wibro network control station; And (f) the Wibro communication network control station transmitting a response to the handover process to the user terminal via the source base station; continuous voice call service providing method between IMS-based heterogeneous communication network. The method of claim 1, After the step (f), (g) the user terminal switching a mode to the WCDMA communication network according to a handover processing response and recognizing handover processing with the target base station to which the user has handed over; (h) the target base station transmitting a relocation and handover complete signal for the user terminal to an exchange station of the WCDMA communication network; (i) the switching station of the WCDMA communication network transmitting and confirming a network switching completion signal with the Wibro communication network control station; And (j) the switching center of the WCDMA communication network further comprises performing a home location registration process according to a home location management node and handover; and a continuous voice call service providing method between IMS-based heterogeneous communication networks. The method according to claim 1 or 2, In step (d), The voice call session switching start instruction to the VCC server is an IMS-based heterogeneous communication network, characterized in that for transmitting the message that means to switch the session from the base station and the control station before the network switching of the user terminal to the base station and the switching center after the network switching. Method of providing continuous voice call service between. The method according to claim 1 or 2, The VCC server of step (d), A method of providing continuous voice call service between heterogeneous communication networks based on IMS, characterized in that it is included in an IMS-based Service Centralization and Continuity (SCC) application server. The method according to claim 1 or 2, In step (d), The voice call session switch start instruction, A method for providing continuous voice call service between IMS-based heterogeneous communication networks using messages according to ITU-T (International Telecommunication Standardization Sector) and 3GPP standards. The method of claim 5, The voice call session switch start instruction, A method for providing a continuous voice call service between heterogeneous communication networks based on IMS, characterized by using an ISUP IAM (STN-SR) message. -Session Transfer Number for SRVCC (STN-SR), Single Radio VCC (SRVCC) The method according to claim 1 or 2, The Wibro network control station and the source base station, ACR (Access Control Router) and RAS (Radio Access Station) characterized in that the continuous voice call service providing method between the IMS-based heterogeneous communication network. The method according to claim 1 or 2, The WCDMA communication network switching center and the target base station, MSC and RNC (or Node B) is a continuous voice call service providing method between the IMS-based heterogeneous communication network. WCDMA network switching center device for continuously providing voice call service between Wibro network and WCDMA network supporting IMS-based VoIP, A network switching request receiving module for receiving a network switching request according to a voice call handover of a Wibro network user terminal to a WCDMA communication network in association with a Wibro network switching center; A handover processing module configured to perform relocation and handover processing for the WCDMA target base station and the user terminal to be handed over when receiving a network switching request from the Wibro communication network to the WCDMA communication network; And Interworking with an IMS-based VCC server, the handover processing module instructs the VCC server to start voice call session switching at the same time as the handover processing for the user terminal, thereby converting and updating a session from a Wibro communication network to a WCDMA communication network. And a VCC interworking module for inducing processing to perform session release processing of a Wibro communication network. The method of claim 9, The network switch request receiving module, Apparatus for providing continuous voice call service between heterogeneous communication networks based on IMS, comprising: transmitting a response to a network switching process to the Wibro network control station. The method of claim 9, The handover processing module, Apparatus for providing a continuous voice call service between an IMS-based heterogeneous communication network characterized in that after the handover process, a home location management node of a WCDMA communication network and a home location registration process according to handover are performed. The method of claim 9, The VCC interworking module, Apparatus for providing continuous voice call service between heterogeneous communication networks based on IMS, characterized in that it interworks with a VCC server included in an IMS-based Service Centralization and Continuity (SCC) application server. The method of claim 9, The VCC interworking module, Continuous voice call service between IMS-based heterogeneous networks, instructing the VCC server to initiate voice call session switching using a message according to ITU-T (International Telecommunication Standardization Division) and 3GPP standards Provision device. The method of claim 13, The VCC interworking module, Apparatus for providing continuous voice call service between heterogeneous communication networks based on IMS, characterized by instructing the VCC server to initiate voice call session switching using an ISUP IAM (STN-SR) message. -Session Transfer Number for SRVCC (STN-SR), Single Radio VCC (SRVCC)

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