KR20070025271A - Method and apparatus for sending and receiving call unregistered user in a ip multimedia subsystem network - Google Patents

Abstract

A method and an apparatus for sending and receiving a call in an IP(Internet Protocol) based multimedia subsystem network when losing subscriber's information are provided to obtain a continuous service in a case of a hardware error of an S-CSCF(Serving-Call Session Control Function) system by allowing an UE(User Equipment) to supply a sending and receiving service without an UE's re-registering process even in case of a dual down of a database. A method for sending and receiving a call in an IP(Internet Protocol) based multimedia subsystem network when losing subscriber's information includes the steps of: receiving an SAR(Server Assignment Request)(405) including a server assignment type and a common user ID of a receiving terminal for requesting subscriber profile information to an S-CSCF(470); recognizing a registered state of the common user ID when the server assignment type is set as a non-registered user; and, in case of the registered state, checking whether private user IDs related to the common user ID are registered or not and transmitting an SAA(Server Assignment Answer) message including a P-CSCF(Proxy-CSCF) name list about the registered private user IDs, information binding addresses of the users, and user's information to the S-CSCF.

Description

METHOD AND APPARATUS FOR SENDING AND RECEIVING CALL UNREGISTERED USER IN A IP MULTIMEDIA SUBSYSTEM NETWORK}

1 illustrates the components and interfaces of an IM CN subsystem in an ALL IP core network architecture.

2 is a diagram illustrating a configuration of an S-CSCF performing a subscriber registration function.

3 is a diagram illustrating a registration procedure of a UE according to a preferred embodiment of the present invention.

4 is a diagram illustrating a call signal processing procedure of a subscriber having lost subscriber information according to an embodiment of the present invention.

5 is a diagram illustrating an incoming call processing procedure of a subscriber having lost subscriber information according to an exemplary embodiment of the present invention.

6 illustrates information elements of a SAR message for a registration / deregistration notification request of an S-CSCF in accordance with a preferred embodiment of the present invention.

FIG. 7 illustrates information elements of a SAA message for a registered / unregistered notification response of an S-CSCF according to a preferred embodiment of the present invention. FIG.

8 is a diagram illustrating a procedure for notifying registration required when calling for a subscriber having lost subscriber information according to an embodiment of the present invention.

9 is a diagram illustrating a procedure for notifying registration required when an incoming call is received for a subscriber whose subscriber information is lost according to an embodiment of the present invention.

10 is a flowchart illustrating an outgoing call processing procedure of an S-CSCF according to a preferred embodiment of the present invention.

11 is a flowchart illustrating an incoming call processing procedure of an S-CSCF according to a preferred embodiment of the present invention.

12 is a flowchart illustrating a procedure for notifying the UE that registration is required by the S-CSCF according to an embodiment of the present invention.

13 is a flowchart illustrating a processing procedure of a UE for a selection message according to a preferred embodiment of the present invention.

14 is a flowchart illustrating a procedure of an HSS receiving a SAR according to a preferred embodiment of the present invention.

The present invention provides a serving call session control function which is a function entity responsible for call session control of a next generation IP-based multimedia subsystem (IMS) network. The present invention relates to session control of a Call Session Control Function (hereinafter referred to as "S-CSCF"), and more particularly, to a method and an apparatus for enabling an outgoing call and an incoming call of subscriber information due to a failure of the S-CSCF.

Recently, with the rapid development of mobile communication and the Internet, it is required to realize various multimedia services of high quality for mobile subscribers. The development of the Internet multimedia service required a change from the existing circuit-based next generation core network (hereinafter referred to as 'CN') to the packet-based CN, and further, the IP-based ( Evolving to IP-based CN form. Currently, 3GPP (3Generation Partnership Project) standardizes all IP-based network reference models to provide IM (IP-based Multimedia) services.

The IM service refers to a service capable of simultaneously providing various types of packet-based services based on an IP transport protocol to a mobile subscriber at a lower level. Of course, you can use non-real-time services such as file transfer, e-mail, and short messages at the same time, or use new services such as videophones, instant messaging, emergency calls, etc. ), Local service, presence service, etc. are available.

1 is a diagram illustrating components and interfaces of an IMS network in an ALL IP core network structure.

Referring to FIG. 1, the IM service domain is a Call Session Control Function (hereinafter referred to as Call Session Control Function) that is responsible for registration and multimedia call processing functions using a Session Initiation Protocol (hereinafter referred to as “SIP”). CSCF ') (120, 140, 150) and the home location register (HLR) function of the legacy mobile network for mobility management and authentication of IP multimedia users. It is composed of a home subscriber server (Home Subscriber Server, hereinafter referred to as "HSS") 130 is integrated. Let's take a closer look at the signaling protocol and session procedures between CSCF and HSS, which are important factors for IM service, and related functional elements.

Since the CSCFs 120, 140, and 150 have different functions depending on the networks in which the subscribers are located, the Proxy-CSCF (P-CSCF) 120 and the Interrogating-CSCF (I-) are based on their positions and roles. CSCF) 140 and Serving CSCF (S-CSCF) 150 may be logically divided.

The P-CSCF 120 is the first point where a user equipment (hereinafter referred to as 'UE') is connected to the IM multimedia network 100 and is present in the same domain as the Gateway GPRS Support Node (GGSN). The P-CSCF 120 transfers the SIP registration request message received from the UE to the I-CSCF 140 with reference to the home domain of the UE, and the S-CSCF received the SIP message received from the UE through a registration procedure. The address is transmitted to the S-CSCF 150 using the address. In addition, the UE 110 functions to request or respond to a SIP message.

I-CSCF 140 is the first point of access to the home network of the UE (110) may exist several in one network domain. The I-CSCF 140 receives the address of the S-CSCF 150 that performs SIP registration of the UE 110 from the HSS 130 and then allocates or receives the S-CSCF 150 that is responsible for the actual registration. The SIP message received from the network is routed to the S-CSCF 150.

The S-CSCF 150 is responsible for a registration function in SIP for storing subscriber information of a user who receives an IMS service. The S-CSCF 150 registers the session control server of the UE 110 in the HSS 130 and then registers the subscriber information of the UE. (Profile data) is downloaded and stored, and information related to service resources is provided while managing session state of an actually registered UE (tone, announcement). Obtain the address of the I-CSCF of the home domain of the destination UE 110 through the dialed number of the UE or the SIP URL, and performs authentication with the authentication information received from the HSS 130 at the time of registration of the UE 110. It may also perform the function of P-CSCF.

The HSS 130 is a master database of subscribers, and is responsible for all information of subscribers for call session control. It includes all the features of the existing 3G HLR, and also contains signaling protocols related to information for IM subscribers for IM services. One or several such HSSs 130 may exist in one same network depending on the number of subscribers and the configuration capability of the network. HSS is a subscriber's master database with basic information related to subscribers, including subscriber identifiers, such as number and address information, subscriber security information, network access control information for authentication and authorization, subscriber location information, registration and inter-system. Level of mobile information and service profile information of the subscriber.

In FIG. 1, the UE 110 registers with the S-CSCF 150 via the P-CSCF 120 and the I-CSCF 140 through a registration message of SIP to receive an IMS service. S-CSCF 150 obtains subscriber information of the corresponding user through a Server Assignment Request (SAR) / Server Assignment Answer (SAA) Diameter message with the HSS 130. The information thus obtained is stored in the register of the S-CSCF 150 and used for creating a call session while maintaining for the period in which the user is registered.

As described above, when the UE 110 registers with the network in FIG. 1, the corresponding S-CSCF 150 stores subscriber information of the UE 110 provided from the HSS 130, and when the call is requested, the S-CSCF 150. The CSCF 150 connects an incoming call to the UE 110 using the subscriber information.

2 is a diagram illustrating a configuration of an S-CSCF performing a registration function of a subscriber.

Referring to FIG. 2, a structure in which a plurality of applications 200 performing service processing on a hardware platform of a server farm structure shares a load is illustrated. Applications obtain subscriber information from a plurality of Subscriber Data Managers (hereinafter, referred to as " SDMs ") 210 and 220 that perform a Register function. Such SDMs have redundant SDBs. SDB1p 213 is a primary node of SDM1 210 and SDB1b 226 located in SDM2 220 represents a backup node of SDM1 210. SDB1p 213 and SDB1b 226 store the same data so that S-CSCF can continue service even if one database fails. However, if the SDM1 210 and the SDM2 220 have a node failure at the same time and the subscriber information of the UE is lost, the service cannot be continued.

The conventional IMS network operating as described above does not consider a method for processing outgoing and incoming calls for an abnormal state of the S-CSCF. Therefore, when the contents of the register are lost due to a system failure of the S-CSCF, there is a problem in that the UE cannot receive outgoing or incoming service until re-registration is performed.

Accordingly, an object of the present invention, which was devised to solve the problems of the prior art operating as described above, normally provides outgoing and incoming calls to the UE when the subscriber information of the UE is lost due to a system failure of the S-CSCF. It is to provide a method and apparatus.

Another object of the present invention is to provide a method and apparatus for transmitting a name and user address of a P-CSCF in a message for subscriber registration.

Another object of the present invention is to provide a method and apparatus for transmitting address information capable of storing a list of names and user addresses of a P-CSCF in a response message for subscriber registration.

In order to achieve the above object, an embodiment of the present invention provides a serving call session control function (S-CSCF) in a method for enabling subscriber information outgoing origination and incoming call in an IP-based multimedia subsystem. Receiving a server assignment request (SAR) message including a server assignment type and a public user ID of the called terminal to request subscriber profile information of the called terminal from the terminal; and if the server assignment type is set to an unregistered user, Checking a registration state of the public user ID, and if the check result is registered, searching for registration of dedicated user IDs associated with the public user ID, and proxies for the registered dedicated user IDs as a result of the search. Binding the call session control function (P-CSCF) name list with the address of the user It characterized in that, including the information, and user information to the server assignment answer (SAA) message comprising the step of transmitting to the S-CSCF.

According to another embodiment of the present invention, in a method for enabling a subscriber information call reception in an IP-based multimedia subsystem, when registration of a terminal is required, the S-CSCF assigned to the terminal is a home subscriber server (HSS). Transmitting a proxy name including a proxy name, which is a name of a P-CSCF connected to the user terminal, and a user connection address, to a SAR message requesting subscriber profile information of the terminal, and the HSS transmits the proxy name to the terminal. Storing the public and dedicated user IDs of the user ID, transmitting the SAA message including the user address information and the user information to the S-CSCF, and storing the subscriber profile information by the S-CSCF. It is characterized by.

In still another aspect of the present invention, there is provided an apparatus for enabling outgoing and incoming subscriber information in an IP-based multimedia subsystem.

If the registration of the terminal is required, the proxy name that is the name of the P-CSCF connected to the user terminal in the SAR message that the S-CSCF assigned for the terminal requests the subscriber profile information of the terminal to a home subscriber server (HSS). And a serving call session control function (S-CSCF) for transmitting the user address, including a server assignment type and a public user ID of the called terminal to request subscriber profile information of the called terminal from the S-CSCF. If a server allocation request (SAR) message is received and the server assignment type is set to a non-registered user, the registration status of the public user ID is checked. If the verification result is registered, the dedicated associated with the public user ID is checked. Search for the registration of the user IDs; and the proxy call session control unit (P-CSCF) name for the searched dedicated user IDs. It consists of the HSS to transmit the information binding the user address of the terminal and the user information to the S-CSCF including the server assignment response (SAA) message, wherein the S-CSCF is the user information included in the SAA message It is characterized by storing.

Hereinafter, the operating principle of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, if it is determined that a detailed description of a known function or configuration may unnecessarily flow the gist of the present invention, the detailed description thereof will be omitted. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout the specification.

The present invention provides a proxy-name AVP capable of storing a name of a P-CSCF included in a path header of a REGISTER SIP message to normally perform an incoming call when a failure occurs in an S-CSCF register. Is included conditionally in a Server Assignment Request (hereinafter referred to as "SAR") / Server Assignment Answer (hereinafter referred to as "SAA") message. Also, conditionally adds all user-address AVPs to SAR / SAA message that can store UE's contact information included in the contact header of the registered SIP message in order to perform call origination normally. do. The operation of the present invention consists of an IMS registration procedure of a UE and an incoming call processing procedure for the UE.

3 is a diagram illustrating a UE registration procedure according to a preferred embodiment of the present invention.

In step 301, the UE 350 transmits a registration message to the P-CSCF 360 to register with the IMS. In step 303, the P-CSCF 360 transmits the registration message to the I-CSCF 370. In step 306, the I-CSCF 370 transmits a User Authorization Request (hereinafter referred to as "UAR") message to the HSS 380. The UAR message includes information such as a feasibility study result or a performance list of the UE 350. The HSS 380 checks the UAR message received from the I-CSCF 370 and then the S-CSCF 390 suitable for the capability of the UE 350 to the I-CSCF 370 in step 309. A User Authorization Answer (hereinafter referred to as "UAA") message is sent.

In step 311, the I-CSCF 370 transmits a registration message for the UE 350 to the S-CSCF 390. Then, the S-CSCF 390 performs the authentication (Authentication) for the UE (350). In step 313 after successful authentication, the S-CSCF 390 transmits a SAR message requesting subscriber profile information of the UE to the HSS 380. The SAR message includes a name of the P-CSCF 360 to which the UE is connected, that is, a proxy name AVP and a user-address AVP. The HSS 380 binds and stores the proxy name and the user address in the received SAR message and stores the public and dedicated user IDs of the UE 350. The HSS 380 receiving the SAR message transmits an SAA message to the S-CSCF 390 in step 315. The SAA message includes profile data of the UE. The S-CSCF 390 receiving the SAA stores the subscriber information and transmits a 200 (OK) response message to the I-CSCF 370 in step 317. The I-CSCF 370 receiving the response message transmits a 200 (OK) response message to the P-CSCF 360 in step 319, and the P-CSCF 360 receives the response message in step 321. The 200 (OK) response message is transmitted to the UE 350 to complete the registration procedure of the UE 350.

4 is a diagram illustrating an outgoing call processing procedure of a subscriber having lost subscriber information according to an embodiment of the present invention.

The UE 450 transmits an INVITE request message, which is a message for initiating a call, to the P-CSCF 460 in step 401, and the P-CSCF 460 sends the received invitation request message in step 403. Send to the CSCF 470. The S-CSCF 470 checks the invitation message for the lost UE 450, searches its register (Registrar), and if found normally, transmits the invitation request message to the I-CSCF (not shown). However, if the registrar recognizes that there is no profile of the UE 450, it transmits a SAR message to the HSS 480 in step 605.

The HSS 480 checks the information element of the received SAR message, and when the Server-Assignment-Type AVP is set to “UNREGISTERED_USER”, the public stored in the HSS 480 is stored. Checking the registration state of the public user identity and connecting to the user bound to the P-CSCF name set in the SAR during the registration procedure of the dedicated user IDs associated with the public user ID in the "registration" state. The user data AVP is included in the list with the addresses and the SAA, and the user data AVP is configured to be the same as the user-data-request-type AVP set to the "REGISTERED_PROFILE." In step SSA message is sent to the S-CSCF 470. At this time, the HSS 480 sets the "DIAMETER-REGISTERED-SERVICE (2006)" to the Result-Code AVP value.

The S-CSCF 470 receives the SAA and transmits an invitation request message to an I-CSCF (not shown) in step 409, and follows an outgoing signal processing procedure for the registered subscriber UE 450.

5 is a diagram illustrating an incoming call processing procedure of a subscriber having lost subscriber information according to an embodiment of the present invention.

In step 501, the invitation request message from the originating UE is transmitted to the S-CSCF # 1 550. After checking the invitation request message, the S-CSCF # 1 550 transmits a 100 (Trying) message to the calling UE in step 503. The S-CSCF # 1 550 transmits the invitation request message to the I-CSCF 560 in step 507. In operation 509, the I-CSCF 560 that has confirmed the invitation request message transmits a 100 (Trying) message to the S-CSCF # 1 550. In addition, the I-CSCF 560 transmits a user location information query message to find the S-CSCF # 2 580 of the called UE to the HSS 570 in step 511, and the HSS 570 sends the called UE. Respond information about S-CSCF # 2 580 registered for. In step 513, the I-CSCF 560 transmits an invitation message for the called UE to the S-CSCF # 2 580. The S-CSCF # 2 580 that has received the invitation message transmits a 100 (Trying) message to the I-CSCF 560 in step 515.

The S-CSCF # 2 580 searches its register to find profile information of the called UE. If it is found normally, the called UE is connected and connected. If not, it is determined that the subscriber information of the called UE is lost or unregistered. In step 517, the HSS (Unterminated subscriber) is terminated by the termination service procedure of an unregistered subscriber. SAR message is sent to 570). The SAR includes a public user ID of the called UE obtained from the invitation request message of step 513.

When the Server-Assignment-Type AVP input to the received SAR is set to "UNREGISTERED_USER", the HSS 570 registers a state of a public user ID stored in the HSS 570. In the "registered" state, the private user IDs associated with the public user ID are bound to the P-CSCF name set in the SAR during the registration process. The user profile (User-Data) AVP is configured with the subscriber profile of the registered state and included in the SAA, and the SAA message is transmitted to the S-CSCF # 2 580 in step 519. At this time, "DIAMETER-REGISTERED-SERVICE (2006)" is set in the Result-Code AVP value.

The S-CSCF # 2 580 receiving the SAA message connects with the called UE according to the incoming call processing procedure for the registered subscriber.

FIG. 6 is a diagram illustrating information elements of a SAR message for a registration / non-registration notification request of S-CSCF in a general IMS network.

As shown in FIG. 6, the SAR message includes a public user ID, an S-CSCF name, a P-CSCF name, a user connection address, a dedicated user ID, a server assignment type, user data request type information, user information in use, and routing information. Include.

The public user ID information includes a public user ID or a list of public user IDs, and the S-CSCF name information is a name of an S-CSCF as a server name. For user connection address, add User_Address AVP so that user connection address can be delivered.

Proxy-Name AVP of the P-CSCF name and User_Address AVP of the user connection address are SARs by registration (when there is no profile of a UE corresponding to P-Asserted_Identity in the register of the originating S-CSCF during the processing of an initial SIP message). And, if there is no profile of the UE corresponding to the Request-URI in the register of the incoming S-CSCF.

The dedicated user ID information informs the user name. The server assignment type information is S-CSCF update type information in the HSS. For example, the server assignment type information includes information such as whether a non-registered user is set. The user data request type information is a part of a user profile requested by the S-CSCF to the HSS. The user data information in use includes user profile information in use in the S-CSCF, and the routing information indicates the destination host information and stores the name of the HSS.

FIG. 7 is a diagram illustrating information elements of a SAA message for a registration / non-registration notification response of an S-CSCF according to a preferred embodiment of the present invention.

As shown in FIG. 7, the SAA message includes a dedicated user ID, user routing information, a registration result, a user profile, and billing information. The unique user ID is a user name. The user routing information is address information. The Server-Assignment-Type AVP value entered in the SAR message is stored in the HSS of the public ID set in the "UNREGISTERED_USER" and the Public-Identity AVP. If the registered status is "registered", the Address-Information AVP includes a list in which the P-CSCF and the user connection address are bound.

The registration result is the result code AVP and the experiment result AVP, and the result code is used for fault discovery of the Diameter base protocol. The user profile represents user information, and the charging information is an address of charging functions including usage information of all other elements, and the user information AVP is transmitted to the S-CSCF.

8 is a diagram illustrating a procedure for notifying registration required when calling for a subscriber whose subscriber information is lost according to an exemplary embodiment of the present invention.

The originating UE 850 sends an ACK message to the P-CSCF 860 in step 801, and the P-CSCF 860 receives an S-CSCF 870 in step 603. ), The S-CSCF 870 receives the ACK message. The S-CSCF 870 transmits an ACK message to the called party S-CSCF (S-CSCF 950 of FIG. 9) in step 805, and registration of subscriber information for the originating UE 850 is performed in step 807. By sending an OPTIONS message to the P-CSCF 860 containing the information that it is needed, the P-CSCF 860 sends a selection message to the originating UE 850.

In step 811, the originating UE 850 receiving the selection message transmits a 200 OK, which is a response message to the selection message, to the P-CSCF 860. In step 813, the P-CSCF 860 transmits S-. Send 200 ok to the CSCF 870.

In step 815, the originating UE 850 performs a registration process by transmitting a registration request message to the P-CSCF 860 after receiving 200 ok. In order to inform the performance of the registration procedure, "Control" is defined in a protocol of a reason header used in a selection message as shown in Table 1 below. (See Chapter 2 of RFC 3326)

An example of using a selection message indicating that registration is required is shown in Table 2 below.

9 is a diagram illustrating a procedure for notifying that registration is required when a subscriber receives lost subscriber information according to an exemplary embodiment of the present invention.

The S-CSCF 950 that receives the ACK message from the originating S-CSCF 870 in step 901 transmits the ACK message to the P-CSCF 960 in step 903, and the P-CSCF 960 in step 905. Send an ACK message to the destination UE (970).

In operation 907, the S-CSCF 950 transmits a selection message to the P-CSCF 960 including information indicating that registration of subscriber information with respect to the destination UE 970 is required. The P-CSCF 960 transmits the selection message received in step 909 to the destination UE 970.

The called UE 770 transmits a 200 ok message, which is a response message to the received selection message, to the P-CSCF 960 in step 911, and the 200-OK message is also transmitted to the P-CSCF 960 in step 913. It transmits to the S-CSCF (950). The called UE 770 checks the registration request information included in the received selection message, and transmits a registration message to the P-CSCF 960 in step 715 to perform the registration procedure of the called UE 970. As in FIG. 8, the selection message includes the contents of Tables 1 and 2.

10 is a flowchart illustrating an outgoing call processing procedure of an S-CSCF according to a preferred embodiment of the present invention.

10 illustrates the operation of an S-CSCF for an outgoing call of a lost subscriber.

In step 1005, the invitation request message is received from the P-CSCF, and in step 1010, the originating UE that transmits the invitation request message is checked. Proceed to send an invitation request message to the incoming I-CSCF, and the calling UE is connected to connect.

If it does not exist, the method proceeds to step 1015 and transmits to the HSS an element in which the server assignment type is set as an unregistered user in the SAR message information, and includes the proxy name and address information to which the user address is bound from the HSS. The UE receives the SAA message to register the UE. Thereafter, in step 1020, the invitation request message is transmitted to the incoming I-CSCF, and the registered UE performs the call signaling procedure requested by the registered UE.

11 is a flowchart illustrating an incoming call processing procedure of an S-CSCF according to a preferred embodiment of the present invention.

11 shows the operation of the S-CSCF for the incoming call of the lost subscriber.

In step 1105, the invitation request message is received from the I-CSCF, and a 100 (Trying) message is transmitted to the I-CSCF. In step 1110, the S-CSCF checks the destination UE to receive the invitation request message. If the S-CSCF finds a profile for the destination UE in its register, the S-CSCF proceeds to step 1130 and transmits the invitation request message to the destination P-CSCF. do.

However, if not found, it is determined that the subscriber information of the called UE is lost or not registered, and the flow proceeds to step 1115 and the HSS is transmitted to the HSS including an element in which the server assignment type is set as an unregistered user in the SAR message information. Receive SAA messages from If the SAA message received in step 1020 includes the proxy name and the address information AVP to which the user address is bound, the UE is registered and transmits an invitation request message to the called P-CSCF, and the called UE is registered. Perform signal processing procedures.

However, if the address information does not exist, it is determined that the subscriber information of the called UE is lost or not registered, and the process proceeds to step 1325 and is processed by an incoming service procedure of an unregistered subscriber, such as retransmitting a SAR message. do.

12 is a flowchart illustrating a procedure for notifying the UE that registration is required by the S-CSCF according to an embodiment of the present invention.

In step 1205, if the ACK message for 200 ok of the invitation message is received, in step 1210, if the subscriber information for the originating or terminating UE is lost, and terminates if it is not the lost subscriber, and if the lost subscriber, Alternatively, a selection message indicating that subscriber registration of the called UE is required is transmitted to the calling or called UE.

13 is a flowchart illustrating a processing procedure of a UE for a selection message according to a preferred embodiment of the present invention.

In step 1305, the selection message transmitted from the P-CSCF is processed, and in step 1310, if the selection message includes information indicating that registration is required, the registration-necessary notification information is not included in the selection message, and then terminated. If the registration required notification information is included in the selection message, the process proceeds to step 1315 to perform the registration procedure.

14 is a flowchart illustrating a procedure of an HSS receiving a SAR according to an embodiment of the present invention.

In step 1405, if the HSS that received the SAR from the S-CSCF has not set the server assignment type (Sever-Assignment-Type) of the SAR message to the unregistered user (UNREGISTERED_USER) in step 1410, the HSS proceeds to step 1415, respectively. Process according to the setting of the server allocation type of SSA, and send the SAA to the S-CSCF.

However, if the server assignment type is set to a non-registered user, the flow proceeds to step 1420 to check the registration status of the public user ID included in the SAR. If it is not the registered state, in step 1425, the HSS extracts the profile of the non-registered user for the public user ID, and in step 1630 SA- message including the extracted unregistered user profile S- Send to CSCF.

However, if the public user ID is registered, proceed to step 1435 to search for registration of dedicated user IDs associated with the public user ID, and in step 1440, proxy names of P-CSCFs registered for the dedicated user IDs. In step 1445, the list is found and transmitted to S-CSCF including the public user ID, the total user profile information for the dedicated user ID, and the proxy name list.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by those equivalent to the scope of the claims.

In the present invention operating as described in detail above, the effects obtained by the representative ones of the disclosed inventions will be briefly described as follows.

According to the present invention, even when a dual down of the database occurs in the S-CSCF configured as primary / backup, since the UE can provide outgoing and incoming services without performing the re-registration procedure, the S-CSCF Continuous service can be provided even in the case of hardware failure of the system.

Claims (11)

A method for enabling subscriber originating outgoing and incoming calls in an IP-based multimedia subsystem, Receiving a server assignment request (SAR) message including a server assignment type and a public user ID of the called terminal to request subscriber profile information of the called terminal from a serving call session control function (S-CSCF); If the server assignment type is set to a non-registered user, checking a registration state of the public user ID; If it is registered as a result of the check, it is searched for registration of dedicated user IDs associated with the public user ID, and the proxy call session control function (P-CSCF) name list for the registered dedicated user IDs of the search result and the And binding the user's address and the user's information to a server assignment response (SAA) message and transmitting the same to the S-CSCF. The method of claim 1, further comprising: if the server assignment type is not set as a non-registered user, processing according to each server assignment type, and transmitting a SAA message to the S-CSCF. The method. The method of claim 1, wherein if the public user ID is not registered, And extracting profile information of the non-registered user with respect to the public user ID and transmitting a SAA message including the extracted non-registered user's profile to the S-CSCF. What is claimed is: 1. A method for enabling subscriber information inbound call in an IP based multimedia subsystem, If the registration of the terminal is required, the proxy name that is the name of the P-CSCF connected to the user terminal in the SAR message that the S-CSCF assigned for the terminal requests the subscriber profile information of the terminal to a home subscriber server (HSS). And, including the process of transmitting the user connection address, Storing, by the HSS, the public name and the dedicated user ID of the terminal, and transmitting a SAA message including the user address information and the user information to the S-CSCF; And the S-CSCF stores the subscriber profile information. The method as claimed in claim 4, further comprising the step of storing the subscriber profile information and processing an outgoing call by transmitting an invitation message to the incoming I-CSCF. The method of claim 4, further comprising: storing the subscriber profile information, and checking whether address information exists in the SAA, and if present, transmitting an invitation message to the incoming P-CSCF to process the incoming call. The method characterized in that. An apparatus for enabling subscriber originating outgoing and incoming calls in an IP-based multimedia subsystem, If the registration of the terminal is required, the proxy name that is the name of the P-CSCF connected to the user terminal in the SAR message that the S-CSCF assigned for the terminal requests the subscriber profile information of the terminal to a home subscriber server (HSS). And a Serving Call Session Control Function (S-CSCF) for transmitting the user address, Receiving a server assignment request (SAR) message including a server assignment type and a public user ID of the called terminal to request subscriber profile information of the called terminal from the S-CSCF, If the server assignment type is set to a non-registered user, check the registration status of the public user ID, If it is registered as a result of the check, it is searched for registration of dedicated user IDs associated with the public user ID, and the proxy call session control function (P-CSCF) name and the user address of the terminal for the searched dedicated user IDs. It consists of the HSS to send the S-CSCF including the bound information and user information in the server assignment response (SAA) message, Wherein the S-CSCF stores the user information included in the SAA message. The method of claim 7, wherein the HSS is, And if the server assignment type is not set to an unregistered user, processing according to each server assignment type, and transmitting a SAA message to the S-CSCF. The method of claim 7, wherein the HSS is, If the public user ID is not registered, And extracting profile information of the non-registered user with respect to the public user ID and transmitting a SAA message including the extracted non-registered user's profile to the S-CSCF. The method of claim 7, wherein the S-CSCF, And storing the subscriber profile information and processing an outgoing call by transmitting an invite message to the incoming I-CSCF. The method of claim 7, wherein the S-CSCF, And after storing the subscriber profile information, if the address information exists in the SAA and if present, the apparatus further comprises transmitting an invitation message to the called P-CSCF to process the incoming call. .

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