KR20080093725A - Terminal unit for providing ip multimedia service on the basis of session initiaion protocol, call session control function device, method of transmitting and receiving thereof - Google Patents

Abstract

A terminal device for providing an IP multimedia service on the basis of a session setup protocol, a call session control function device and a method for transmitting or receiving a service request by using the same are provided to discriminate provided services more in detail by using a property tag which expresses information on an application. A method for transmitting or receiving a service request comprises the following several steps. If a call sending side terminal executes a specific application at the user's request(S101), the call sending side terminal generates a property tag which expresses information on an executed application by referring to an application mapping table(S103). The call sending side terminal inserts the property tag into a contact header field and an accept-contact header field of an INVITE message(S105). The call sending terminal transmits the INVITE message to a CSCF(Call Session Control Function) unit(S107). The CSCF unit analyzes the property tag inserted in the received INVITE message(S109). The CSCF unit searches for an application server according to an analysis result of the property tag by referring to an application server mapping table(S111). The CSCF unit forwards the INVITE message to the searched application server(S113). The application server processes the forwarded INVITE message according to a corresponding service logic and transfers the INVITE message to the CSCF unit(S115). The CSCF unit transfers the INVITE message to a call receiving terminal(S117). The call receiving terminal extracts the property tag from the INVITE message(S119) and maps the property tag with a corresponding application(S121).

Description

Terminal device for providing IP multimedia service on the basis of session initiaion protocol, call session control function device, method of transmitting and receiving

1 is a schematic diagram of a network to which an embodiment of the present invention is applied.

2 is a block diagram showing the configuration of a terminal apparatus according to an embodiment of the present invention.

3 is a block diagram showing the configuration of an outgoing processor according to an embodiment of the present invention.

4 is a block diagram showing a configuration of an incoming call processing unit according to an embodiment of the present invention.

5 is a diagram illustrating an application mapping table according to an embodiment of the present invention.

6 is a block diagram showing the configuration of a call session control function according to an embodiment of the present invention.

7 is a flowchart illustrating a process of providing an IP multimedia service based on a session establishment protocol according to an embodiment of the present invention.

The present invention relates to a terminal device for providing an IP multimedia service based on a session establishment protocol, a call session control function device, and a service request transmission / reception method using the same.

IMS is a core network technology of the 'ALL-IP' concept that integrates wired and wireless environments, and is an infrastructure for providing IP (Internet Protocol) multimedia services. The basic service goal of IMS is to provide a combination of multimedia such as voice, audio, video and data based on IP protocol. To provide these IMS services, sessions are established through negotiation processes that exchange capabilities or preferences between end users. After the session is established, an actual bearer is formed between terminals of end users to exchange data. IMS uses the SIP protocol provided by the Internet Engineering Task Force (IETF) to establish these sessions.

When providing a service based on such an IMS network, a communication service identifier for distinguishing an IMS service is inserted into a SIP message. The communication service identifier is used as information for mapping with the corresponding application on the terminal side. In addition, the network end is used as information for selecting an application server that performs a process for providing a service to a terminal side.

However, considering that IMS provides multimedia in different media formats, even if one IMS service is expected to diversify the applications that execute it.

However, although a scheme for distinguishing IMS services is provided in the related art, there is no scheme for distinguishing an application executing the same.

Therefore, a technical problem to be achieved by the present invention is a terminal device for providing an IP multimedia service based on a session establishment protocol for providing one IMS service through one or more applications, a call session control function device, and a service request transmission / reception using the same. To provide a way.

In order to achieve the above problems, the terminal device according to the characteristics of the present invention,

A terminal device connected to an IP multimedia subsystem domain network to provide a session establishment protocol based service, comprising: a storage unit which stores an application mapping table including one or more application information for providing one IP multimedia service; An origination processing unit configured to transmit a service request including the characteristic tag by configuring a characteristic tag indicating application information of an IP multimedia service requested by a user with reference to the application mapping table; And an incoming processing unit for obtaining application information corresponding to the characteristic tag extracted from the received service request from the application mapping table and mapping the received service request to the obtained application.

Call session control function device according to a feature of the present invention,

A call session control function device that is located in an IP multimedia subsystem domain network to which a terminal device is connected and performs call control based on a session establishment protocol, comprising: a feature tag indicating application information of an IP multimedia service and an IP multimedia service A mapping information database that stores an application server mapping table that contains mapping information between application servers; And selecting the application server information mapped to the characteristic tag included in the service request received from the calling terminal device from the application server mapping table, and delivering the received service request to the selected application server. And a control unit for receiving the signal and transmitting it to the called terminal device.

Service request transmission method according to an aspect of the present invention,

A method for transmitting an IP multimedia service request based on a session establishment protocol, the method comprising: checking application information executed according to a service request of a user, wherein the application information includes one or more application information corresponding to the service; Generating a property tag indicating application information of a requested service based on the checked application information; And transmitting a service request including the generated characteristic tag.

Service request receiving method according to an aspect of the present invention,

A method for receiving an IP multimedia service request based on a session establishment protocol, the method comprising: receiving a service request including a property tag indicating application information of a service requested by a user; Identifying application information mapped with the property tag in previously stored application information, wherein the application information includes one or more application information corresponding to one service; And providing the service requested by the user by executing the checked application.

DETAILED DESCRIPTION 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. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless specifically stated otherwise. In addition, the terms “… unit”, “… unit”, “module”, “block”, etc. described in the specification mean a unit that processes at least one function or operation, which is hardware or software or a combination of hardware and software. It can be implemented as.

Now, a terminal device for providing an IP multimedia service based on a session establishment protocol according to an embodiment of the present invention, a call session control function device, and a service request transmission / reception method using the same will be described in detail with reference to the accompanying drawings.

1 is a schematic diagram of a network to which an embodiment of the present invention is applied.

According to FIG. 1, the configuration of an ALL IP network to which an embodiment of the present invention is applied is implemented based on a SIP protocol, and includes a terminal device 100, an access network 200, an IMS core network 300, and a plurality of application servers 400. Include.

The terminal device 100 is connected to the IMS core network 300 through the access network 200 to provide a SIP-based IMS service. In this case, the terminal device 100 is equipped with one or more applications executed to provide one IMS service. The mounted application exchanges service data with an application server 400 providing a corresponding service through a bearer protocol.

The terminal device 100 performs a transmission / reception process of a service request including a feature tag indicating application information of an IMS service requested by a user.

The access network 200 is a network that is directly connected to the terminal device 100 and may be a wired internet network, a CDMA network, a WCDMA network, a WiBro network, or the like.

The IMS core network 300 performs call control and session management using the SIP / SDP protocol provided by the Internet Engineering Task Force (IETF). The IMS core network 300 is in charge of the home subscriber server 310 (hereinafter referred to as HSS) 310 which stores user related information and user service profile information in the IMS network and service control, and provides streaming service resources to the user. Call Session Control Function Device (hereinafter referred to as CSCF) 320 for providing information.

Here, the CSCF 320 transmits and receives a SIP message with the terminal device 100 through the access network 200. The IMS service call is forwarded to the application server 400 through the SIP message so that the SIP-based IMS service can be provided. In this case, the selection of the application server 400 to be forwarded uses the feature tag of the service request received from the originating terminal device 100.

In addition, the HSS 310 receives and stores all application information provided by the terminal device using a characteristic tag when registering the SIP of the terminal device. The stored information may be used later for processing according to the detailed classification of the service, including charging processing of the terminal device.

The application server 400 is an application layer server for providing a SIP-based mass multimedia service using IMS. This provides a service to the terminal device 100 through a bearer protocol after session setup for providing the service requested by the terminal device 100. Here, the application server 400 includes a specific service providing server, a media resource function (MRF), a media gateway function (MGF), and the like.

Next, a configuration of providing a service using a property tag indicating application information of an IMS service requested by a user will be described.

2 is a block diagram showing the configuration of a terminal apparatus according to an embodiment of the present invention.

According to FIG. 2, the terminal device 100 includes one or more IMS service applications 120 for one IMS service and a SIP processing unit 140 that is a layer for processing a SIP protocol.

Here, the SIP processing unit 140 includes a storage unit 142, an outgoing processing unit 144, an incoming processing unit 146, and a control unit 148.

The storage unit 142 stores an application mapping table configured with mapping information for identifying one or more applications corresponding to one IP multimedia service.

The originating processor 144 is a configuration corresponding to a user agent client (hereinafter referred to as UAC) for initiating a SIP request. The originating processor 144 generates a feature tag indicating application information of the IP multimedia service requested by the user with reference to the application mapping table. The generated characteristic tag is included in the service request and transmitted.

At this time, the format of the feature tag has four tree structures. It consists of a part indicating a tree tag (g: Global tree, a u: URI tree), a part indicating an organization, a part indicating a service identifier, and a part indicating an application identifier executed to provide a corresponding service. For example, it can be represented as + g.3gpp.Service Identifier.Application Identifier.

The incoming processing unit 146 performs a function of a user agent server (hereinafter referred to as UAS) that receives a SIP request and returns a response thereto. The incoming processing unit 146 extracts the property tag included in the received service request and checks the corresponding application information from the application mapping table. In addition, the checked application is executed to process the received service request.

The control unit 148 handles encoding / decoding and transmission / reception of SIP messages, including a standard SIP protocol stack conforming to IETF RFC3261. Then, the SIP protocol function required by each of the components 144 and 146 which executes and executes the originating processor 144 and the called processor 146 is executed.

3 is a diagram illustrating an application mapping table according to an embodiment of the present invention.

According to FIG. 3, the application mapping table P100 may include a service identifier P101, an application identifier P103, an application P105, and an application server P107. In this case, the application mapping table P100 of FIG. 3 is an example of a video-voice service.

Here, the service identifier P101 represents one IP multimedia service, that is, a video-voice service.

The application identifier P103 represents one or more applications for executing a service corresponding to the service identifier P101. In other words, it represents the applications running the video-voice service.

The application P105 indicates application information corresponding to the application identifier P103.

In this case, when the application identifier P105 is not defined, the mapped application information P105 is a default application. The default application is a basic application that provides the service.

The application server P107 represents application server information for providing a corresponding service through the execution of the application P105.

4 is a block diagram showing the configuration of an outgoing processor according to an embodiment of the present invention. That is, the originating processor of the SIP processor of FIG. 2 is configured.

According to FIG. 4, the originating processor 144 includes a feature tag generating module 144a, a message generating module 144b, and a sending module 144c.

The characteristic tag generation module 144a searches the application mapping table P100 and extracts a service identifier and an application identifier corresponding to an application executed according to a service request of the user. Then, the property tag is generated based on the extracted identifiers.

The message generating module 144b generates a message for the service request and inserts the characteristic tag generated by the characteristic tag generating module 144a in a specific header field of the message. Here, the specific header field is a field into which service information requested by the sender is inserted, and a Contact header field and an Accept-Contact header field of the SIP message may be used.

The transmitting module 144c transmits a message for service request generated by the message generating module 144b.

5 is a block diagram showing the configuration of an incoming call processing unit according to an embodiment of the present invention. That is, it is a structure of an incoming processing unit of the SIP processing unit of FIG.

According to FIG. 5, the incoming processing unit 146 includes a receiving module 146a and a mapping module 146b.

The receiving module 146a receives the service request message and extracts the property tag inserted in the specific header field of the message.

The mapping module 146b searches the application mapping table P100 of FIG. 3 to confirm the extracted feature tag and the mapped application information. The service request message is then mapped to the checked application. That is, the checked application is executed to perform service processing according to the received service request message.

6 is a block diagram showing the configuration of a call session control function according to an embodiment of the present invention.

Here, the call session control function device or CSCF (320 of FIG. 1) forwards the service request received to the selected application server (400 of FIG. 1) through a feature tag of the service request received from the calling terminal 100. .

According to FIG. 6, the call session control function device 320 includes a first interface unit 322, a second interface unit 324, a mapping information database 326, and a controller 328.

The first interface unit 322 is connected to the access network 200 and performs data transmission / reception with the terminal device (100 of FIG. 1).

The second interface unit 324 is connected to one or more application servers 400 of FIG. 1 to exchange data with the application server 400.

The mapping information database 326 stores an application server mapping table that contains mapping information between the property tag and the application server. In this case, the application server mapping table is configured similarly to the application mapping table of FIG. 3, but further includes an application server identifier and an IP address of the corresponding server.

The controller 328 selects application server information corresponding to the feature tag of the service request received from the originating terminal device through the first interface unit 322 from the application server mapping table. The received service request is transmitted to the selected application server 400 through the second interface unit 324. The service request processed according to the service logic is received through the second interface unit 324 and transmitted to the called terminal device through the first interface unit 322.

Here, the controller 328 includes a message analysis module 328a and a mapping module 328b in more detail.

The message analysis module 328a extracts the feature tag from the specific header field of the service request message received from the originating terminal device.

The mapping module 328b searches the mapping information database 326 and selects application server information mapped to the service identifier and the application identifier of the extracted feature tag.

In this case, when the application identifier of the characteristic tag is not included, the default application server information of the corresponding service determined through the service identifier is selected.

Based on the above configuration, a process of providing a SIP-based IP multimedia service in an IMS network will be described.

7 is a flowchart illustrating a process of providing an IP multimedia service based on a session establishment protocol according to an embodiment of the present invention. In particular, Figure 7 shows the SIP session establishment process for the service.

According to FIG. 7, when a specific application is executed in response to a user's request (S101), the calling terminal generates a characteristic tag indicating the executed application information by referring to the application mapping table (S103).

The calling terminal apparatus inserts the generated characteristic tag into the Contact header field and the Accept-Contact header field of the INVITE message (S105).

The calling terminal apparatus transmits an INVITE message in which the characteristic tag is inserted to the CSCF (S107).

The CSCF 107 analyzes the characteristic tag inserted in the INVITE message received in step S107 (S109). The application server is searched and selected according to the analysis result of the characteristic tag by referring to the application server mapping table (S111).

The CSCF 107 forwards the INVITE message received in step S107 to the application server selected in step S111 (S113).

The application server performs the processing of the forwarded INVITE message according to the service logic (S113) and transfers it back to the CSCF (S115).

The CSCF forwards the INVITE message received from the application server to the called terminal (S117).

The called terminal device extracts the characteristic tag of the INVITE message received in step S117 (S119) and maps it to the corresponding application (S121).

Then, the service requested by the calling terminal is provided between the calling terminal, the called terminal, and the application server through the mapped application.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

As described above, according to the exemplary embodiment of the present invention, the service may be provided through one or more applications by requesting the service including the property tag indicating the information of the application executed for the service.

In addition, the service provided by the terminal device may be further classified through the property tag indicating the application information.

Claims (16)

A terminal device connected to an IP multimedia subsystem domain network to provide a session establishment protocol based service, A storage unit which stores an application mapping table including at least one application information for providing one IP multimedia service; An origination processing unit configured to transmit a service request including the characteristic tag by configuring a characteristic tag indicating application information of an IP multimedia service requested by a user with reference to the application mapping table; And An incoming processing unit for obtaining the application information corresponding to the characteristic tag extracted from the received service request from the application mapping table and mapping the received service request to the obtained application Terminal device comprising a. The method of claim 1, The application mapping table, A service identifier representing one or more IP multimedia services, An application identifier representing one or more applications for executing a corresponding service corresponding to each of the service identifiers, and Terminal device including the application information mapped to the service identifier and the application identifier. The method of claim 2, The application mapping table, The terminal device to which the default application information that is basically provided for providing the service is mapped to the service identifier to which the application identifier is not mapped. The method according to claim 2 or 3, The outgoing processing unit, A feature tag generation module configured to extract a service identifier and an application identifier corresponding to the IP multimedia service requested by the user from the application mapping table and configure the feature tag based on the feature identifier; A message generating module for inserting the characteristic tag into a specific header field of the message for the service request; And A transmission module for transmitting a message for the service request with the characteristic tag inserted Terminal device comprising a. The method of claim 4, wherein The incoming processing unit, A receiving module for extracting the property tag inserted into a specific header field of the message from the received service request message; And A mapping module that obtains application information mapped to a service identifier and an application identifier of the property tag from the application mapping table and maps the received service request to the obtained application information. Terminal device comprising a. A call session control function apparatus for performing call control based on a session establishment protocol located in an IP multimedia subsystem domain network to which a terminal device is connected, A mapping information database for storing an application server mapping table containing mapping information between a property tag indicating application information of an IP multimedia service and an application server providing the IP multimedia service; And Select the application server information mapped to the property tag included in the service request received from the originating terminal device from the application server mapping table, and transfer the received service request to the selected application server to perform the service request. Control unit for receiving and transmitting it to the called terminal device Call session control function device comprising a. The method of claim 6, The application server mapping table, A service identifier representing one or more IP multimedia services, An application identifier representing one or more applications for executing a corresponding service corresponding to each of the service identifiers, and Call session control function device including application server information mapped to the service identifier and the application identifier. The method of claim 7, wherein The application server mapping table, Call session control function device is mapped to the default application server information of the service to the property tag that does not include the application identifier. The method according to claim 7 or 8, The control unit, A message analysis module that extracts the feature tag from a specific header field of a service request message received from the originating terminal device; And A mapping module that searches the application server mapping table and selects application server information mapped to a service identifier and an application identifier of the extracted characteristic tag Call session control function device comprising a. A method for transmitting an IP multimedia service request based on a session establishment protocol, Identifying application information executed according to a service request of a user, wherein the application information includes one or more application information corresponding to the service; Generating a property tag indicating application information of a requested service based on the checked application information; And Transmitting a service request including the generated characteristic tag Service request transmission method comprising a. The method of claim 10, The checking step, And a service identifier indicating a corresponding service of the executed application information and an application identifier of the executed application. The method of claim 11, The generating step, And configuring the property tag based on the identified service identifier and application identifier. The method according to any one of claims 11 to 13, The transmitting step, Inserting the property tag into a specific header field of the message for the service request; And And transmitting a message for the service request in which the property tag is inserted. A method for receiving an IP multimedia service request based on a session establishment protocol, Receiving a service request including a property tag indicating application information of a service requested by a user; Identifying application information mapped with the property tag in previously stored application information, wherein the application information includes one or more application information corresponding to one service; And Providing the service requested by the user by executing the checked application; Service request receiving method comprising a. The method of claim 14, The checking step, And checking the application information mapped to the service identifier of the service requested by the user constituting the feature tag and the application identifier corresponding to the service identifier. The method of claim 15, The providing step, If the property tag does not include an application identifier, the service request receiving method for executing a default application of the service corresponding to the service identifier.

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