KR20150030504A - Method and apparatus for controlling video telephony of group - Google Patents

Abstract

A group video call control method of the present invention includes the steps of checking whether a target terminal is a support terminal or a non-support terminal of the group video call when a group invitation to a target terminal for group video call is received, And blocking the transmission of the group call request to the target terminal when the terminal is the non-serving terminal.

Description

TECHNICAL FIELD [0001] The present invention relates to a group video call control method,

The present invention relates to a group video call service, and more particularly, to a group video call service in which a support terminal for a group video call and a non-support terminal (VoLTE terminal) are distinguished from an intelligent network node in a multi- And more particularly, to a group video call control method and apparatus therefor.

As is well known, the ALL-IP network can provide interworking services with an Internet network using IP (Internet Protocol), and can provide solutions suitable for integrated multimedia services including voice, data, and real- ), The cost reduction effect can be obtained through the packet transmission.

As a core technology for providing a new service in the All-IP based communication environment, an IP Multimedia Subsystem (hereinafter referred to as " IP Multimedia Subsystem ") defined as a core technology for providing various services to subscribers based on the ALL- Quot; IMS "). Such an IMS can provide IP services over a packet network regardless of the access network format, and can provide services that require transmission of multimedia data such as one-to-one video calls as well as general call services.

In 3GPP Release 8, EPC (Evolved Packet Core), which is a network architecture, is described as one of mobile communication systems. EPC is a set of network nodes for 3GPP LTE (Long Term Evolution) to be.

This EPC evolves the core network of the existing 3GPP system architecture to support Evolved-UMTS Terrestrial Radio Access Network (E-UTRAN), which is an evolved RAN, It has an efficient network structure in which the network node is simplified. A wireless communication system including an EPC and an E-UTRAN may be referred to as an evolved packet system (EPS), and an LTE mobile communication system currently in service in Korea can be regarded as such.

Since the LTE mobile communication system can allocate a plurality of communication resources to form a plurality of video call routes, it is possible to provide a multi-party group video call service as well as a one-to-one video call service. Such a group video call service may be referred to as a conference video call service.

That is, the LTE (or VoLTE) mobile communication subscribers invite the C terminal (group video call request) by the A terminal acting as a guard during the video communication between the A terminal (calling terminal) and the B terminal (called terminal) In order to do so, the originating-telephony application server (O-TAS) receives a group video call service from a terminal (TAS) through a mobile communication network node to a terminating-telephony application server (T-TAS) And the called TAS side transmits a group call request (INVITE) to the target terminal through the mobile communication network node.

As is well known, a mixed communication environment in which an LTE mobile communication system (LTE network) is mixed with a legacy network such as a CDMA mobile communication system (2G network) and / or a WCDMA mobile communication system (3G network) In this hybrid communication environment, the LTE terminal is a dual mode communication terminal (UE) capable of accessing an LTE network and capable of accessing a legacy network such as a Wideband Code Division Multiple Access (WCDMA) . ≪ / RTI > However, it is a reality that the legacy terminal (2G terminal or 3G terminal) used in the legacy network can not access the LTE network.

Typically, when a subscriber who is in the middle of a video call wants to select and invite an arbitrary terminal as a target terminal in order to receive a group video call service desired by the user, whether the target terminal supports a group video call or a group video It is not clear whether the terminal is a non-callable terminal.

Accordingly, when the terminal A invites the terminal C for the group video call while the terminal A (calling terminal) and the terminal B (called terminal) are in video communication, according to a request from the originating TAS, (E.g., INVITE) to the C terminal via the C-terminal. If the C-terminal is a non-serving terminal (legacy terminal), the C-terminal is a non-serving terminal even though the called TAS has transmitted the INVITE to the C- The A and B terminals are not provided with the group video call service with the C terminal.

That is, according to the conventional method, there is a problem that unnecessary message traffic is caused in the incoming TAS although the group video call service is not provided when the terminal that is invited to the group video call is a legacy terminal, It is a factor that causes unnecessary waste of resources in the environment.

Korean Patent Publication No. 2010-0039118, published on April 15, 2010. Korean Patent Publication No. 2012-0064900, published on June 20, 2012.

When a call is requested to a target terminal that wants a group video call during a video call between two terminals, it is checked whether the target terminal is a support terminal of a group video call or a non-supported terminal (legacy terminal) In this paper, we propose a new group video call control scheme that blocks group call requests from an intelligent network node to a target terminal.

The problems to be solved by the present invention are not limited to those mentioned above, and another problem to be solved not mentioned can be clearly understood by those skilled in the art from the following description .

According to one aspect of the present invention, there is provided a method for controlling a group video call, comprising the steps of: checking whether the target terminal is a support terminal or a non-support terminal of the group video call when receiving a group invitation for a target terminal, And blocking transmission of a group call request to the target terminal when the terminal is a non-serving terminal.

According to another aspect of the present invention, there is provided a communication system including a subscriber DB for storing terminal information for confirming whether a group video call is supported, a request receiver for receiving a group invitation for a target terminal to which the group video call is desired, A terminal management unit for checking whether the target terminal is a support terminal or a non-supported terminal of the group video call through the terminal information search of the subscriber DB when the terminal is received; And a call request blocking unit for blocking transmission of the call request.

The present invention prevents unnecessary message traffic from the intelligent network node by blocking the group call request sent from the intelligent network node to the corresponding terminal when the corresponding terminal requested for the group video call is a non-supported terminal (legacy terminal) of the group video call It is possible to effectively prevent unnecessary resource waste in the mobile communication environment from being caused.

FIG. 1 is a network configuration diagram of a heterogeneous mobile communication hybrid system to which a group video call control scheme according to the present invention can be applied,
FIG. 2 is a block diagram of a node device to which a group video call control scheme according to the present invention is applicable;
FIG. 3 is a block diagram of a group term call control apparatus according to the present invention;
FIG. 4 is a flowchart illustrating a control procedure at a network node when a group invitation for a group video call is generated according to the present invention. FIG.
FIG. 5 is a flowchart illustrating a main procedure for determining whether a group call request is transmitted when a target terminal received a group invitation according to the present invention is a non-serving terminal of a group video call.

First, the advantages and features of the present invention, and how to accomplish them, will be clarified with reference to the embodiments to be described in detail with reference to the accompanying drawings. While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. It is to be understood that the following terms are defined in consideration of the functions of the present invention, and may be changed according to intentions or customs of a user, an operator, and the like. Therefore, the definition should be based on the technical idea described throughout this specification.

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

FIG. 1 is a network configuration diagram of a heterogeneous mobile communication hybrid system to which a group video call control scheme according to the present invention can be applied, and includes a plurality of communication terminals (UE) 110/1 110/3, a first mobile communication network 120, a second mobile communication network 130, an IP multimedia subsystem 140, and the like. Here, the first mobile communication network 120 may be defined as a first network node, the second mobile communication network 130 may be defined as a second network node, and the intelligent network 140 may be defined as an intelligent network node.

Referring to FIG. 1, communication terminals UE-A and UE-B 110/1, 110/2, 110 and 110 are provided with mobile communication related services and the like by a base station (eNodeB) 121 in a first mobile communication network 120 Can receive a packet-based voice call service, a packet-based video call service, a group video call service, and a packet-based data communication service from the base station 121. For example, an LTE subscriber terminal, an HD voice, And a VoLTE subscriber terminal supporting the VoIP service. Between each of the communication terminals UE-A and UE-B is defined a cell or a radio unit (RU) including a mobile communication antenna installed in a building or the like, a mobile communication repeater, (Name) can be installed.

The communication terminals UE-A and UE-B can realize a group video call by inviting a target terminal (for example, the communication terminal UE-C) desiring group video communication during a video call. When a video call is connected, a message indicating whether the called terminal is a support terminal for a group video call or a non-supported terminal can be provided from the intelligent network 140 via the first mobile communication network 120, When the target terminal invited for the group video call is a group video call unsupported terminal (legacy terminal), the intelligent network 140 can be notified via the first mobile communication network 120.

In addition, the communication terminal (UE-C) 110/3, which is provided with the mobile communication related service by the second mobile communication network 130, may be a circuit or packet-based voice call service, And a circuit or packet-based data communication service, for example, a 3G subscriber terminal or the like. To this end, the second mobile communication network 130 may refer to a legacy network such as a 3G (WCDMA) mobile communication system.

The first mobile communication network 120 may include an eNodeB 121, a Mobility Management Entity (MME) 122, and the like. A signaling node (SGW) 123, a packet processing node (PGW) 124, and a Policy & Charging Rule Function (PCRF) 125. Here, each node (e.g., eNodeB, MME,

SGW, PGW, PCRF, etc.) may be partially or selectively incorporated or replaced with other components depending on the network environment of the mobile communication network system.

First, the base station 121 exemplarily shows only one eNodeB for the sake of convenience of explanation and understanding. However, it is also possible that the communication service (for example, a voice call service, a video call service, (E. G., Various multimedia services including group video call service, supplementary information service, etc.) can be supervised by the mobility management node 122 and several tens eNodeBs can be controlled in one tracking area (TA) Group).

The base station 121 may be defined as a base station, a base station equipment, or a base station device as a device supporting next generation technologies and services such as LTE (or VoLTE), and may be defined as a radio bearer control, a radio resource management function such as radio admission control, connection mobility control, and dynamic resource allocation to a communication terminal can be provided. Here, the base station 121 may be defined as a digital unit (DU), for example.

In addition, the base station 121 may transmit and receive information such as IP header compression and encryption of user data streams, routing of user plane data to the SGW 123, scheduling and transmission of paging messages, Scheduling and transmission of data, measurement and measurement reporting for mobility and scheduling, and the like.

The mobility management node 122 may be a node that manages the mobility of a communication terminal (terminal device) through a signal control charge between the base station 121 and the signal processing node 123, , Idle subscriber management, paging, and subscriber authentication functions. That is, the mobility management node 122 may be configured to process control signals when there is a binding request from the terminal or another network node, for example, the signal processing node 123 or the packet processing node 124, And can receive the subscriber profile information, authentication, and location related data from the HLR (home location register) (not shown) to set up the EPS bearer or IP tunnel And mobility management can be provided. Here, the HLR can store and manage subscriber profile information, authentication, location-related data of the terminal, and the like.

The signal processing node 123 performs a session control process for processing payload traffic according to a predetermined session based on a communication policy in the network provided from the policy management node 125 (UE) interface with the base station 121 to support handoff in the LTE mobile communication system and the 3GPP network, and supports the handover of the packet processing node 124 An ESP bearer (Evolved Packet System bearer), and a PDU (Packet Data Unit) using tunneling.

In addition, the packet processing node 124 allocates the IP of the terminal device according to communication and accounting policies provided from the policy management node 125, and allocates the IP address of the user plane node < RTI ID = 0.0 > And provides tunneling and IP routing functions through an organic linkage with the intelligent network 140. The signal processing node 123 and the external The PDU may be delivered to the network, and the policy management node 125 may provide the signal processing node 123 with the policy priority information. Here, the policy management node 125 manages and performs communication policies and billing policies in the communication network through provision of dynamic QoS and billing rules according to the service data flow. And the like.

Next, the policy management node 125 provides dynamic QoS and billing rules according to a service data flow to process and execute communication policies and billing policies in the mobile communication system And so on.

Although not shown in the figure, the second mobile communication network 130 includes a plurality of nodes such as a NodeB, an RNC, a Mobile Switching Center (MSC), a Cellular Gateway Switch (CGS) A 3G mobile communication service is provided to a communication terminal (e.g., a 3G subscriber terminal) including a Serving General Packet Radio Service Support Node (SGSN), a Gateway General Packet Radio Service Support Node (GGSN) (Collectively referred to as a second network node) that can perform functions such as communication call to the communication network 120 and providing an IP-based service through organic interlocking with the intelligent network 140, .

On the other hand, the intelligent network 140 may mean an IMS (IP Multimedia Subsystem), which may be defined as an intelligent network node, for example, a call session control function (CSCF) 141, A Home Location Register (HLR) 142, an originating-telephony application server (O-TAS) 143, a media resource function (MRF) 144, TAS: Terminating - Telephony Application Server) 145 and the like.

First, the call session control node 141 performs call processing and performs basic functions such as Session Initiation Protocol (SIP) based multimedia session control. The call session control node 141 includes a subscriber registration , Authentication, billing, service-specific triggering and routing, caller location inquiry, and decompression and release of SIP messages, and can be divided into Proxy_CSCF, Interogating-CSCF, and Serving-CSCF depending on the role.

Also, the call session control node 141 may receive a call from any of the two communication terminals (e.g., UE-A and UE-B) To the originating application service node 143 when an invitation message (e.g., a REFER message) to the group video call to the first mobile communication network 120 (or the target terminal) is received via the first mobile communication network 120, When a confirmation notification message (for example, a NOTIFY message) of a call request is received from the originating application service node 143, it is transmitted to the first mobile communication network 120

To the communication terminal UE-A requesting the group invitation to the arbitrary communication terminal UE-C via the communication terminal UE-C.

Furthermore, the call session control node 141 transmits a call request message (for example, an INVITE message) for a group call with the communication terminal UE-C from the originating application service node 143 to the called application service node 145), and when a group call incapable message (for example, a NOT ACCEPTABLE message) representing any of the non-serving terminals (legacy terminals) of the group video call is received from the destination terminal requested to receive the group video call from the incoming application service node 145 (Not ACCEPTABLE NOTIFY message) is received from the originating application service node 143 in response to this, it is transmitted to the originating application service node 143 via the first mobile communication network 120 And transmitting the same to the communication terminal UE-A.

The subscriber information node 142 refers to a node including a database storing subscriber information for a first mobile communication network (e.g., LTE network) and / or a second mobile communication network (e.g., 3G network) Subscriber profile information, authentication, location-related data of the terminal, and the like. Herein, the subscriber information node 142 may be defined (collectively) as an HSS (Home Subscriber Server) capable of providing the same or similar functions.

Next, the originating application service node 143 provides a function of performing an additional service operation such as caller display, call / incoming prohibition, call forwarding, group video call, and changing a message field for call processing and call processing And can handle interworking with various nodes, operation, administration, and maintenance to perform billing and CSCF, MRF, HLR and additional services. And may include a subscriber DB for storing registration status information including subscriber's additional service status and terminal information. Here, the source application service node 143 may function as a destination application service node (destination TAS) according to the location status of the communication terminal requesting the group video call.

In addition, the originating application service node 143 receives the invitation message (e.g., REFER message) for the group video call from the call session control node 141 according to the present invention, (E.g., transmitting an INVITE message) to the multimedia resource node 144 to prepare for call (i.e., real-time transcoding of multimedia data for a group call), and in response thereto, a request confirmation message is received from the multimedia resource node 144 When it is received, transmits a group call disable message generated from the called application service node 145 to the call session control node 141, and when the group call disable message is received via the call session control node 141, (E.g., a NOT ACCEPTABLE NOTIFY message) to the communication terminal UE-A via the call session control node 141 and the first mobile communication network 120 It can provide capability.

The multimedia resource node 144 may function as a multimedia server that provides a multimedia service control, management, and codec conversion function provided to a subscriber. For this purpose, a call announcement broadcast (voice / video) And can provide functions such as group video call (media conference), conversion between text and voice / speech recognition, and real-time transcoding of multimedia data. To this end, the multimedia resource node 144 may include a media resource function controller and a media resource function processor, although not shown in the drawings.

In addition, the multimedia resource node 144 generates a request confirmation message corresponding to a group call preparation request (for example, an INVITE message is received) from the originating application service node 143 according to the present invention, 143) to the user.

On the other hand, the destination application service node 145 may equally provide the functions provided by the originating application service node 143, for example, as an incoming TAS, And may include configurations as shown. Here, the called application service node 145 may function as a calling application service node in a location status of the communication terminal requesting the group video call.

FIG. 2 is a block diagram of a node device to which a group video call control technique according to the present invention is applicable, and includes a call processing block 202, a subscriber DB 204, a billing block 206, an interworking interface block 208, Block 210, and the like.

2, the call processing block 202 provides a function of performing additional service operations such as caller indication, call / incoming call prohibition, call forwarding, group video call, and changing a message field for call processing and call processing For this, the call processing block 202 may include a group video call control apparatus having a configuration as shown in FIG.

3 is a block diagram of a group video call control apparatus according to the present invention and may include a request receiving unit 302, a terminal management unit 304, a call request blocking unit 306 and a terminal status reporting unit 308 And may selectively include an opposite terminal management unit 310. [

3, the request receiver 302 receives a group invitation to a target terminal (e.g., UE-C) to which a group video call is desired, i.e., receives a group invitation from the O-TAS 143 to the communication terminal UE- And delivering a call request message (e.g., an INVITE message) for a call to the terminal management unit 304 when the call request message is received.

Next, the terminal management unit 304 extracts the target terminal information included in the body of the call request message transmitted from the request reception unit 302, and then, through the terminal information search of the subscriber DB 204 of FIG. 2, (For example, UE-C) stored in the subscriber DB 204 shown in FIG. 2, whether or not the terminal is a support terminal for a video call or a non-supported terminal (e.g., an LTE terminal) or a non-supported terminal (e.g., a legacy terminal) through confirmation of the terminal information inserted in the feature tag And transmitting the result of the check to the call request blocking unit 306 and the terminal status report unit 308, for example.

To this end, the subscriber DB 204 of FIG. 2 stores registration state information including subscriber's supplementary service status and terminal information (i.e., terminal information for confirming whether the group video call is supported). That is, in order to realize the present invention, the application service node (incoming TAS or originating TAS) registers terminal information (support terminal information or unsupported terminal information) for each subscriber supporting the group video call in the subscriber DB and manages .

When it is notified that the target terminal that has requested the group video call from the terminal management unit 304 is a non-supported terminal, the call request blocking unit 306 blocks the group call request to the target terminal, that is, To block the transmission of the group call request to the communication terminal UE-C via the communication terminal UE-C.

Next, the terminal status report unit 308 notifies the terminal management unit 304 of a guidance message indicating that the target terminal, which has been invited to the group video call, is a non-supported terminal when the target terminal requested to perform the group video call is notified that the terminal is a non- The call origination application service node 143, the call session control node 141, and the first mobile communication network 120 via the communication path through which the group video call is requested, And transmitting the group video call to the invited communication terminal UE-A side.

Lastly, when the video call is connected between two communication terminals (calling terminal and called terminal) (when a video call is connected between two terminals before an arbitrary terminal is invited to a group video call) The calling terminal may provide a function of checking whether the called terminal is a supporting terminal or a non-supported terminal of the group video call through the search of the calling terminal, and providing the checking result to the calling terminal. When there is an originating application service node (origination TAS) responsible for a service and a terminating application service node (terminating TAS) responsible for a service for the terminating terminal, the destination application service node . Here, the check as to whether or not the terminal is a non-supported terminal can be performed by confirming the terminal information inserted in the feature tag of the contact header for the called terminal stored in the subscriber DB.

2, the billing block 206 may provide a function of performing a related billing process when communication terminals are provided with an additional service or the like performed in the intelligent network 140, and the interlocking interface block 208 The OAM (Operation Administration Maintenance) block 210 may perform operations such as operation of the TAS in the intelligent network 140, Administration, Maintenance, and so on.

Meanwhile, in the embodiment of the present invention, when the target terminal that is invited to the group video call is a non-serving terminal (legacy terminal) of the group video call, blocking of the group call request transmitted to the target terminal is performed by the called application service node However, the present invention is not necessarily limited to this. By applying the configuration member and functions for blocking transmission of a group call request to a target terminal (non-serving terminal) to the call session control node (CSCF) side, It goes without saying that the call session control node may be designed to block the transmission of the group call request to the target terminal (the non-serving terminal).

Next, a series of processes for controlling the group video call in the network node according to the present invention will be described in detail in the hybrid mobile communication system having the above-described configuration.

4 is a flowchart illustrating a control procedure at a network node when a group invitation for a group video call is generated according to the present invention.

4, when a video call (group call or conference call) is connected between two communication terminals, for example, a calling terminal UE-A and a called terminal UE-B, It is checked whether the called terminal UE-B is a supporting terminal (for example, an LTE terminal) or a non-serving terminal (for example, a legacy terminal) of the group video call in the called application service node. To the terminal UE-A. Here, the check of the non-supporting terminal with respect to the called terminal can be performed by checking the terminal information inserted in the feature tag of the contact header for the called terminal stored in the subscriber DB .

Next, a communication terminal (calling terminal) UE-A serving as a clerk during a video call connection between the two communication terminals UE-A and UE-B is connected to an arbitrary communication terminal (for example, (E.g., a REFER message) to invite the communication terminal UE-C to the group video call. The communication terminal UE-C may invite the UE-C to the target terminal for the group video call. The invite message is transmitted to the originating application service node 143 through a communication path via the first mobile communication network 120 and the call session control node 141 (steps 401 and 402).

In response, the originating application service node 143 generates an acknowledgment message (e.g., a 200 OK message) corresponding to the received invitation message and transmits the acknowledgment message to the call application control node 141 via the first mobile communication network 120 To the communication terminal UE-A via the communication path (steps 403 and 404).

Again, the originating application service node 143 transmits the group call preparation to the target terminal, that is, the real-time transcoding of the multimedia data for the group call, in order to confirm the group call to the target terminal based on the received invitation message, The multimedia resource node 144 generates a request acknowledgment message corresponding to the received request message and transmits the request acknowledgment message to the originating application service node 143 in response to the request (e.g., transmission of the INVITE message) to the node 144 (step 406) (Step 407).

Then, the originating application service node 143 generates a confirmation notification message (for example, a NOTIFY message) of the call request in response to the receipt of the request confirmation message, and transmits the notification message to the call session control node 141 and the first mobile communication network 120 To the communication terminal UE-A via the communication path via the communication path (step 408), and receives a response ACK (e.g., 200 OK message) from the communication terminal (step 409).

The originating application service node 143 generates a call request message (for example, an INVITE message) for group call with the communication terminal UE-C and transmits the call application message To the service node 145 (step 410).

As a result, in the receiving application service node 145, a process of checking whether the target terminal is a supporting terminal (for example, an LTE terminal) or a non-serving terminal (for example, a legacy terminal) 5 will be described in detail.

FIG. 5 is a flowchart illustrating a main procedure for determining whether a group call request is transmitted when a target terminal received a group invitation according to the present invention is a non-serving terminal of a group video call.

5, the request receiver 302 receives a group invitation to a desired communication terminal UE-C, that is, receives a group call with the communication terminal UE-C from an originating application service node 143 (For example, an INVITE message) to the terminal management unit 304 (step 502).

Next, the terminal management unit 304 extracts the target terminal information included in the body of the received call request message (step 504), searches the subscriber DB 204 for terminal information (step 506) It is checked whether the terminal UE-C is a supporting terminal (e.g., LTE terminal) or a non-serving terminal (e.g., a legacy terminal) of a group video call (step 508). Here, the check of the non-supported terminal with respect to the communication terminal UE-C is performed by checking whether or not the non-supported terminal is inserted in the feature tag of the contact header for the communication terminal UE- And can be performed through confirmation of terminal information.

If it is determined in step 508 that the corresponding communication terminal UE-C is a support terminal for the group video call, the called application service node 145 transmits a group call request to the corresponding communication terminal 510), so that the defined group video call scenario will be executed.

If it is determined in step 508 that the corresponding communication terminal UE-C is a non-supported terminal of the group video call, the call request blocking unit 306 requests a group call to the corresponding communication terminal UE- (Step 512), that is, blocking the group call request from being transmitted to the communication terminal UE-C via the second mobile communication network 130.

Then, the terminal status reporting unit 308 generates a guidance message indicating that the communication terminal UE-C invited to the group video call is a non-supported terminal and transmits the group video call to the terminal requesting the group video call, To the communication terminal UE-A which has invited the group video call through the communication path via the originating application service node 143, the call session control node 141 and the first mobile communication network 120 ).

4, the called application service node 145 transmits a guidance message (group call disabled message: NOT ACCEPTABLE) indicating that the communication terminal UE-C is a non-serving terminal to the call session control node 141 via the call session control node 141 To the originating application service node 143 (steps 411 and 412).

Thereafter, the source application service node 143 generates an ACK message and transmits it to the multimedia resource node 144 (step 413). The destination application service node 143 transmits the ACK message to the destination application service node 145 (Steps 414 and 415).

Finally, the originating application service node 143 generates a group call disabling acknowledgment message (e.g., a NOT ACCEPTABLE NOTIFY message) to communicate with the call session control node 141 via the communication path via the first mobile communication network 120 (Step 416), and receives a response message (e.g., a 200 OK message) from the communication terminal UE-A (step 417) to the terminal UE-A do.

Meanwhile, in the exemplary embodiment of the present invention, a group video call service is provided by providing an originating application service node and a destination application service node, respectively. However, the present invention is not limited thereto, It is needless to say that it is also possible to design a node as a single integrated server (integrated application service node) to provide a group video call service.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims. It is easy to see that this is possible. That is, the embodiments disclosed in the present invention are not intended to limit the scope of the present invention but to limit the scope of the present invention.

Therefore, the scope of protection of the present invention should be construed in accordance with the following claims, and all technical ideas within the scope of equivalents should be interpreted as being included in the scope of the present invention.

According to the embodiment of the present invention, when the corresponding terminal requested for the group video call is a non-supported terminal (legacy terminal) of the group video call, the intelligent network node blocks the group call request transmitted to the corresponding terminal. Accordingly, the present invention can prevent unnecessary message traffic from being generated at the intelligent network node side, and can provide a group video call control model that effectively prevents unnecessary resource waste in the mobile communication environment from being caused.

The present invention including this technical configuration can be applied to a VoLTE (or LTE) mobile communication network, thereby realizing the enhancement of the reliability of group calls in VoLTE or LTE services and the prevention of resource waste.

302: request reception unit 304:
306: call request blocking unit 308: terminal status reporting unit
310:

Claims (11)

Checking whether the target terminal is a supporting terminal or a non-serving terminal of the group video call when receiving a group invitation for a target terminal for group video call;
Blocking the transmission of the group call request to the target terminal when the terminal is the non-serving terminal
The group video call control method comprising: The method according to claim 1,
The method comprises:
Checking whether the called terminal is a supporting terminal or a non-supported terminal of the group video call when a video call call to the calling terminal and the called terminal is connected before the checking process;
Generating a message indicating that the called terminal is a support terminal or a non-supported terminal and providing the generated message to the calling terminal
The group video call control method further comprising: The method according to claim 1,
The method comprises:
And notifying the calling terminal that the target terminal is a non-serving terminal when the terminal is the non-serving terminal
The group video call control method further comprising: The method according to claim 1,
The checking of the unsupported terminal comprises:
Is performed by checking the terminal information embedded in the feature tag of the contact header for the target terminal
Group video call control method. The method according to claim 1,
Wherein the blocking of the group call request comprises:
Performed through an intelligent network node
Group video call control method. 6. The method of claim 5,
Wherein the blocking of the group call request comprises:
(TAS) or call session control node (CSCF) in the intelligent network node
Group video call control method. A subscriber DB for storing terminal information for confirming whether the group video call is supported,
A request receiving unit for receiving a group invitation for a target terminal to which the group video call is desired;
A terminal management unit for checking whether the target terminal is a support terminal or a non-support terminal of the group video call through searching terminal information of the subscriber DB when the group invitation is received;
A call request blocking unit for blocking transmission of a group call request to the target terminal when the terminal is the non-
The group video call control device comprising: 8. The method of claim 7,
And a terminal status reporting unit for generating a guidance message indicating that the target terminal is a non-serving terminal and transmitting the group video call to the requesting terminal when the terminal is the non-
The group video call control apparatus further comprising: 8. The method of claim 7,
The terminal management unit,
It is checked whether the terminal is the support terminal or the non-support terminal by checking the terminal information inserted in the feature tag of the contact header for the target terminal stored in the subscriber DB
Group video call control device. 8. The method of claim 7,
The apparatus comprises:
A check is made as to whether or not the called terminal is a supporting terminal or a non-supported terminal of the group video call when a calling video call is connected to the calling terminal and the called terminal before the group invitation is generated and the check result is provided to the calling terminal Lt; RTI ID =
The group video call control apparatus further comprising: 11. The method of claim 10,
Wherein the counterpart terminal-
The called terminal checks whether the called terminal is a support terminal or a non-supported terminal by checking the terminal information inserted in the feature tag of the contact header for the called terminal
Group video call control device.

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