KR20100102363A - Method and system for service registration at ip multimedia subsystem - Google Patents

Abstract

PURPOSE: A method and a system for registering a service in an IP multimedia sub system are provided to actively register the third service through a registration proxy server without generating an initial filter reference for the third party services which are not saved in a user profile. CONSTITUTION: A terminal(170) generates a registration request message including the third party application server address list. The terminal transmits the registration request message by an S-CSCF(Serving Call Session Control Function)(130). The S-CSCF compares the registration request message with iFC(Initial Filter Criteria) of an HSS(Home Subscriber Server)(140). A registration proxy server extracts the third party application server address list by parsing of the registration request message of the S-CSCF. The registration proxy server transmits the registration request message to the third party application server(160).

Description

Service registration method and system in IP multimedia subsystem {METHOD AND SYSTEM FOR SERVICE REGISTRATION AT IP MULTIMEDIA SUBSYSTEM}

The present invention relates to a service registration method and system in the IP multimedia subsystem. More specifically, the present invention relates to a method and system for registering a third party service through a registration agent server that is not stored in a user profile by a user in an IP multimedia subsystem.

IP Multimedia Subsystem (IMS), an All IP network service structure defined by the 3rd Generation Partnership Project (3GPP), is a multimedia service registration and quality (QoS) based on Session Initiation Protocol (SIP) signaling. of Service) and billing management. The biggest advantage of the IMS is that the service can be created, controlled and changed regardless of the transport network type, such as wired, wireless, and high-speed Internet. In addition, based on IMS, multimedia services such as video and large data can be efficiently implemented.

These IMS services are provided by dedicated application servers, and each service is triggered by a S-CSCF (Serving Call Session Control Function) on the IMS. If a user wants to use a specific service, the SIP request of the user is forwarded to the S-CSCF, and the S-CSCF is configured to check the user profile information received from the home subscriber server (HSS) during the user registration process. Trigger a service based on Initial Filter Crteria (iFC). Here, an initial filter criterion is generated for each service registered by a user, and one initial filter criterion includes at least one trigger point, an address of an application server, a default handling method when an application server cannot be reached, and an application server after service triggering. Contains custom service data to send to.

Therefore, the S-CSCF forwards the SIP request to the application server when the received SIP request matches the trigger point included in the user's initial filter criteria. In addition, in the case of a service that requires a separate registration among the services included in the user profile, the S-CSCF may perform the third party service registration instead in the user's IMS registration process.

However, if the user does not use only the services included in one domain, the information of all the third party services registered by the user may not be stored in the user profile. In fact, in the next generation network system in which various network domains are combined and operated, it is inefficient to manage all service information used by the user by the user profile. Therefore, the HSS creates and manages only services belonging to the user's home domain based on the initial filter criteria. In this case, the S-CSCF cannot perform proxy registration for the third-party services not stored in the user profile.

For this reason, there is a need for a registration method for services for which a user wants to register but is not stored in a user profile, so that the S-CSCF cannot register a third party service.

The present invention has been made to solve the above problems, the registration agent server for performing registration for the third-party service not stored in the user profile, and the structure of the initial filter criteria for triggering the registration agent server The purpose is to present.

In order to solve the above problems, the third party service registration method in the IMS of the present invention generates a registration request message including a third party application server address list in which the terminal provides the third party service, and generates an S-CSCF. (Sing Call Session Control Function), the S-CSCF receives the registration request message and compares it with the initial filter criteria (iFC) received from the home subscriber server and compares the received registration request message to the registration agent server Transmitting, the registration agent server parses the registration request message received from the S-CSCF, extracts the third party application server address list, and extracts the registration request message from the third party application server address list. And registering the third party service by transmitting to the third party application server.

In addition, the IP multimedia subsystem (IMS) of the present invention for solving the above problems is to register the third-party service provided by the third-party application server located in a domain other than the home domain connected to the terminal The apparatus receives and parses a registration request message including a third party application server address list for providing the third party service, and extracts a third party application server address and the extracted third party application server address. And a registration request message transfer unit configured to receive a third party application server address and transmit the received registration request message to the third party application server to register a third party service.

In addition, the third party service registration system of the present invention generates and transmits a registration request message including a third party application server address list for providing the third party service, and receives a registration request message transmitted from the terminal. The third party application server address list is extracted by parsing the registration request message received from the S-CSCF and the S-CSCF which transmits the received registration request message, comparing the initial filter criteria received from the home subscriber server. And a registration agent server that registers a third party service by transmitting the registration request message to the extracted third party application server.

According to the present invention, for third party services not stored in the user profile, the user can actively register the third party service using the registration agent server without generating initial filter criteria. In this process, the user may register a plurality of services through a conventional IMS registration procedure, rather than separately registering each service.

The third party service described in the present invention means a service provided by a domain other than the IMS domain to which the terminal is connected.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Note that, in the drawings, the same components are denoted by the same reference symbols as possible. Further, the detailed description of well-known functions and constructions that may obscure the gist of the present invention will be omitted.

1 is a diagram illustrating a structure of an IMS network that can be applied to an embodiment of the present invention. As shown in FIG. 1, the IMS network structure includes a P-CSCF 110, an I-CSCF 120, an S-CSCF 130, an HSS 140, a home domain AS 150, a third party AS ( 160, the terminal 170 may be included.

Call Session Control Functions (CSCFs) 110, 120, and 130 of the IMS network are functions that handle matters related to call and session processing, and function as a gateway for incoming calls (Incoming Call Gateway). Call Control Function, Address Handling, and SPD (Serving Profile Database) functions. Functioning as a gateway for incoming calls means acting as an entry point and performing routing for incoming calls. In addition, the call control function is responsible for call setup and termination, and status / event management, interaction with multimedia resource functions (MRF) for multiparty services, call event reporting for billing, and reception and processing of application level registration. In addition, the SPD communicates with the HSS 140 of the home domain to manage user profile information, and performs a function similar to the VLR (Visitor Locator Register) of the existing network that informs the home domain of the user's initial access.

The CSCF may be classified into a P-CSCF (Proxy-CSCF) 110, an I-CSCF (Interrogating-CSCF) 120, and an S-CSCF (Serving-CSCF) 130.

The P-CSCF 110 is an IMS access point of a user (User Equipment, UE). P-CSCF acts as a proxy or user agent as defined in IETF RFC2543. In other words, the P-CSCF 110 forwards the SIP registration request transmitted from the terminal 170 to the home domain I-CSCF 120 of the terminal 170 and transmits the address of the S-CSCF 130 in the registration procedure. Save it. When the P-CSCF 110 detects the SIP message transmitted from the terminal 170 to the S-CSCF 130, the P-CSCF 110 transmits the same to the S-CSCF 130.

I-CSCF 120 is the access point of the corresponding IMS domain. In other words, I-CSCF 120 acts as a point of contact for all incoming calls for delivery to users in the network. Due to this role, the I-CSCF 120 serves as a firewall and may have a hidden function to prevent the configuration, topology, and capacity of the operator's network from being exposed to the outside. In addition, the I-CSCF 120 may query the HSS 140 to determine the S-CSCF 130 for each terminal, and allocate the S-CSCF 130 to the terminal 170 in the registration process. Generally there is more than one I-CSCF 120 in one domain.

The S-CSCF 130 receives not only all session state management functions of the IMS but also the user profile in conjunction with the HSS 140 and performs a function for call processing. According to an embodiment of the present invention, the S-CSCF 130 is a subsystem for controlling a session of the terminal 170. The user registers a user in the HSS 140, downloads user information, and stores a user profile. Manage.

When the S-CSCF 130 of the present invention receives the registration request message (REGISTER) from the terminal 170, the S-CSCF 130 triggers the registration agent server 410. To this end, the initial filter criteria stored in the user profile are designed to transmit the registration request message to the registration proxy server. The registration agent server 410 triggered by the S-CSCF 130 substitutes the third party service registration of the terminal 170 for the third party application server.

The home subscriber server (HSS) 140 manages all user information for the corresponding IMS network. In this case, the HSS 140 stores the S-CSCF 120 address and the user profile assigned to all users, and transfers the user profile to the S-CSCF 120 during the user registration process.

According to an embodiment of the present invention, the user profile stored in the HSS 140 includes initial filter criteria for the S-CSCF 130 to trigger a registration agent server. Accordingly, when receiving the registration request message (REGISTER) from the terminal 170, the S-CSCF 130 transmits the received registration request message to the registration agent server according to the initial filter criteria.

The home domain application server (“Home Domain Application Server”) 150 is a component that provides an actual service to a user. The home domain is an IMS domain to which the terminal 170 is connected. Each service is triggered by iFC matching in the S-CSCF 130, and if necessary, the S-CSCF 130 may perform third party service registration upon IMS registration of the service user. In addition, in the case of the home domain AS 150, the HSS 140 may be used as a storage location of necessary service data.

The third party AS (3rd party application server, hereinafter referred to as 'third party application server') 160 is an application server existing in another domain other than the home domain 150. The third party application server 160 may provide various services to the user like the home domain application server 150, but the service information is not stored in the user profile of the home domain. In the present invention, a service provided by the third party application server 160 will be referred to as a third party service.

The terminal 170 accesses the IMS network through the P-CSCF 110. The terminal 170 performs a registration process to use the IMS network, and is assigned an S-CSCF 130 in the registration process.

In addition, the terminal 170 according to an embodiment of the present invention generates a registration request message (REGISTER) including the name (or address) of the third-party application server in the IMS registration process to register the third-party service IMS Can be sent over the network.

2 is a flowchart illustrating a user registration process for using an IMS network.

The terminal 170 transmits a registration request message (REGISTER) to the P-CSCF 110 in step S201 to register with the IMS network. Then, the P-CSCF 110 identifies and forwards the received registration request message in step S202 to the I-CSCF 120 of the corresponding domain. In step S203, the I-CSCF 120 selects the S-CSCF 130 to manage the terminal 170 through information exchange with the HSS 140. Thereafter, the I-CSCF 120 transmits a registration request message to the S-CSCF 130 in step S204.

Then, the S-CSCF 130 receives data for authenticating the terminal 170 from the HSS 150 in step S205, and transmits a 401 response including authentication information to the I-CSCF 120 in step S206. Then, the I-CSCF 120 transmits the received 401 response to the P-CSCF 110 in step S207, and the P-CSCF 110 transmits the 401 response to the terminal 170 in step S208.

The terminal 170 transmits a registration request message (REGISTER) including a result generated through the authentication information included in the 401 response and the information it has to the P-CSCF 110 in step S209. Then, the P-CSCF 110 forwards the registration request message to the I-CSCF 120 in step S210, and the I-CSCF 120 finally delivers it to the S-CSCF 130 in step S211.

The S-CSCF 130 checks the authentication of the terminal 170 using the authentication information included in the registration request message, and receives the user profile from the HSS 140 in step S212. The S-CSCF 130 transmits the 200 response to the terminal 170 in steps S213 to S215 to end the registration process.

Meanwhile, the S-CSCF 130 compares the address of the application server included in the registration request message of the terminal 170 with the service corresponding to the initial filter criteria included in the user profile received from the HSS 140. Here, the user profile received by the S-CSCF 130 from the HSS 140 includes an initial filter criterion for a service subscribed to by the user. The structure of the initial filter criterion will be described with reference to FIG. 3.

If the address of the application server included in the registration request message and the service corresponding to the initial filter criteria match (or match), the S-CSCF 130 transmits the registration request message to the home domain application server 150 in step S221. To pass). In step S220, the home domain application server 150 transmits a 200 response message to the S-CSCF 130 to complete a service registration procedure with the home domain application server 150.

FIG. 3 is a diagram illustrating a Unified Modeling Language (UML) representation for Initial Filter Criteria included in a user profile. The initial filter criteria are user information that provides a criterion for transmitting the SIP message received from the terminal to the application server (AS) by the S-CSCF (130).

As shown in FIG. 3, the initial filter criterion 310 has a priority, which determines the order of execution of the initial filter criterion 310.

In addition, each initial filter criterion 310 may have zero or more trigger point items 320, and one trigger point item 320 may include a plurality of service point trigger items 340. The trigger point item 320 is an element for determining whether a registration request message (REGISTER) transmitted from the terminal 170 is a SIP request that can be transmitted to each application server (AS). The service point trigger item 340 may have a value such as Request-URI, SIP Method, SIP Header, Session Case, Session Description, and the like. If there is no trigger point item 320, the SIP request is sent to the application server unconditionally.

The initial filter criteria 310 also includes information on the application server item (Application Server) 330. The application server item 330 is the address of the application server 330 to which the SIP request is to be sent when the SIP request condition satisfies the trigger point item 320. The application server item 330 not only includes the name and address of a server providing a service corresponding to the corresponding initial filter criterion 310, but also handles when the application server specified by the application server item 330 cannot be reached. The method also includes. In addition, the application server item 330 may also include an include register request item 360 for allowing a third party service registration to include a registration request message (REGISTER) and a service information item 350 to be delivered to the AS. Include.

4 is a flowchart illustrating a process of performing a third party service registration using the registration agent server 410.

In the present invention, a registration agent server 410 for registering a third party service to the third party application server 160 and an initial filter criterion for triggering the registration agent server 410 are presented. The initial filter criterion is configured to transmit the registration request message to the registration agent server 410 when the S-CSCF 130 receives the registration request message from the terminal, and is included in the user profile.

First, the terminal 170 registers a third party service with the third party application server 160 using the registration agent server 410, and includes a registration request including a third party application server address list subscribed to by the terminal 170. Create a message. In this case, the registration request message may include addresses of zero or more third party application servers 160, and the addresses of the third party application servers 160 may be displayed in the form of a Uniform Resource Identifier (URI). Can be.

In operation S401, the terminal 1670 transmits the generated registration request message to the P-CSCF 110. Since the subsequent steps S402 to S415 are performed in the same manner as described in FIG. 2, detailed descriptions thereof will be omitted.

When the S-CSCF 130 detects the service registration request for the home domain application server 150 from the registration request message transmitted from the terminal 170, the S-CSCF 130 transmits the registration request message to the home domain application server 150 in step S421. do. When the service registration procedure is performed in the home domain, the S-CSCF 130 receives the 200 response message in step S422 to complete the home domain service registration procedure.

Meanwhile, the S-CSCF 130 that has completed service registration for the home domain application server compares (matches) the initial filter criteria stored in the user profile with the registration request message (REGISTER). In this case, according to an embodiment of the present invention, the initial filter criterion is set to deliver the message to the registration agent server 410 when the message transmitted from the terminal is a registration request message (REGISTER) in which the authentication procedure is completed.

To this end, the service point trigger 340 of the initial filter criteria may be expressed as shown in Table 1 below.

TABLE 1

Method = "REGISTER"
Authentication = "Integrity-protected = yes"

At the same time, the application server 330 of the initial filter criterion is designated as a URI of the registration agent server 410 and includes an Include Register Request item.

Accordingly, the S-CSCF 130 transmits the received registration request message (REGISTER) to the registration agent server 410 according to the initial filter criteria in step S431.

Then, after receiving the registration request message, the registration agent server 410 transmits a 200 response message to the S-CSCF 130. The registration agent server 410 parses the third party application server address list included in the registration request message. If one or more third party application server addresses are found, the registration agent server 410 transmits a registration request message to the corresponding addresses in step S433. When the registration agent server 410 receives the 200 response message from the third party application server 160, the registration process is completed.

5 is a block diagram showing the internal structure of the registration agent server 410 according to an embodiment of the present invention. The registration agent server 410 of the present invention may include an external entity interface unit 510 and a controller 520. The controller 520 may include a third party application server address extractor 520A and a registration request message transfer unit. 520B may be further provided.

The external entity interface unit 510 interconnects the registration agent server 410 with external entities such as the S-CSCF 130 or the third party application server 160. The external entity interface unit 510 may connect the registration agent server 410 and the external entity through wired or wireless communication. According to an embodiment of the present invention, the external entity interface unit 510 receives a registration request message (REGISTER) transmitted from the S-CSCF 130 and transmits it to the control unit 520 or controls the control unit 520. The registration request message REGISTER may be transmitted to the third party application server 160.

The controller 520 controls the overall operation of the registration agent server 410. In more detail, the controller 520 controls the registration agent server 410 to perform a function as a SIP UA (User Agent) capable of processing a registration request message (REGISTER) in the IMS network. In particular, the controller 520 may further include a third party application server address extractor 520A and a registration request message transmitter 520B.

The third party application server address extractor 520A receives the registration request message REGISTER transmitted from the S-CSCF 130 through the external entity interface 510. The third party application server address extractor 520A parses the registration request message, extracts a third party application server address, and transfers it to the registration request message transfer unit 520B.

The registration request message transmitter 520B receives the addresses of third party application servers transmitted from the third party application server address extractor 520A. In addition, the registration request message transmitting unit 520B transmits a registration request message (REGISTER) received from the S-CSCF 130 to each of the received third party application servers 160, thereby transmitting a third party of the terminal 170. It performs on behalf of the third party service registration for the application server 160.

According to the present invention, the registration agent server 410 performs the third party service registration for the third party application server 160 of the terminal 170 on behalf of. Accordingly, in the IMS system, a user may register a third party service that is not stored in the user profile through the registration agent server 410.

Embodiments of the present invention disclosed in the specification and drawings are only specific examples to easily explain the technical contents of the present invention and aid the understanding of the present invention, and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention can be carried out in addition to the embodiments disclosed herein.

1 is a diagram showing the structure of an IMS network that can be applied to an embodiment of the present invention.

2 is a flowchart illustrating a registration process of a user for using an IMS network.

FIG. 3 illustrates a Unified Modeling Language (UML) representation for Initial Filter Criteria included in a user profile. FIG.

4 is a flowchart illustrating a process of performing a third party service registration using the registration agent server 410.

5 is a block diagram showing the internal structure of the registration agent server 410 according to an embodiment of the present invention.

Claims (10)

A third party service registration method in an IMS that registers a third party service provided by a third party application server located in a domain other than the home domain to which a terminal is connected in an IP multimedia subsystem (IMS). Generating, by the terminal, a registration request message including a list of third party application server addresses that provide the third party service, and transmitting the registration request message to a serving call session control function (S-CSCF); Receiving, by the S-CSCF, the registration request message and comparing it with an initial filter criterion (iFC) received from a home subscriber server, and transmitting the received registration request message to a registration agent server; And The registration agent server parses the registration request message received from the S-CSCF to extract the third party application server address list, and extracts the registration request message from the third party application server address list. Registering the third party service by transmitting to the application server. The method of claim 1, And the third party application server address is expressed in the form of a URI. The method of claim 1, The service point trigger item based on the initial filter is set to be triggered when the registration request message is received. The application server item of the initial filter criterion is configured to transmit the received registration request message to the registration agent server. The method of claim 3, Wherein the registration agent server is specified in the form of a URI. In the third-party service registration device in the IMS that registers the third-party service provided by the third-party application server located in a domain other than the home domain that the terminal connected to the IP multimedia subsystem (IMS), A third party application server address extracting unit for receiving and parsing a registration request message including a third party application server address list providing the third party service, and extracting a third party application server address; And And a registration request message transfer unit configured to receive the extracted third party application server address and transmit the received registration request message to the third party application server to register a third party service. Registration proxy server that performs the registration of services. The method of claim 5, And the third-party application server address is displayed in the form of a URI. In the third-party service registration system provided by a third-party application server located in a domain other than the home domain connected to the terminal in the IP multimedia subsystem (IMS), A terminal for generating and transmitting a registration request message including a third party application server address list for providing the third party service; An S-CSCF which receives a registration request message transmitted from the terminal, compares it with an initial filter criterion received from a home subscriber server, and transmits the received registration request message; And A registration agent for parsing a registration request message received from the S-CSCF, extracting the third party application server address list, and transmitting the registration request message to the extracted third party application server to register a third party service And a third party service registration system in the IMS. The method of claim 7, wherein And the third party application server address is expressed in the form of a URI. The method of claim 7, wherein The service point trigger item based on the initial filter is set to be triggered when the registration request message is received. The application server item of the initial filter criteria is configured to transmit the received registration request message to the registration agent server, the third party service registration system in the IMS. 10. The method of claim 9, The third party service registration system in the IMS, characterized in that the registration agent server set in the application server of the initial filter criteria is specified by a URI.

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