KR20190118849A - Apparatus and Method for controlling IFC trigger on the IMS network - Google Patents

Abstract

The present invention relates to an initial filter criteria (IFC) based trigger control device based on an IP multimedia subsystem (IMS). According to the present invention, the initial filter criteria based trigger control device in an IMS network comprises: an IFC trigger information collection unit for collecting state information and network information of a subscriber terminal; an IFC trigger control unit configured to determine whether to transmit an initial filter criteria to a serving-call session control server by determining whether the state information and network information of the subscriber terminal satisfy an IFC trigger control condition; and a storage unit for storing an IFC trigger control condition table recording at least one IFC trigger control condition corresponding to the initial filter criteria.

Description

Apparatus and Method for controlling IFC trigger on the IMS network}

The present invention relates to an IMS (IP Multimedia Subsystem) based communication system, and more particularly, to the initial filter criterion (IFC) to the Serving Call Session Control Server (S-CSCF). An apparatus and a method for controlling the same.

The biggest feature of ALL IP network that replaces all infrastructure of mobile communication network with IP is that it is the first 3GPP network to support IP multimedia service. This feature is specifically implemented by newly added nodes to support IP multimedia services, and these new nodes are collectively called the Internet Protocol Multimedia Subsystem (IMS).

IMS is a set of nodes newly introduced to provide IP multimedia services. The IMS service network includes a call session control server (CSCF), a home subscriber server (HSS) and an application server (AS: Aplication Server). The call session control server (CSCF) and home subscriber server (HSS) form an IMS core network, and the application server (AS) forms an IMS service network.

The call session control server (CSCF) performs multimedia call control based on Session Initiation Protocol (SIP). The call session control server (CSCF) has a proxy-call session control function (P-CSCF), an interrogating-call session control function (I-CSCF), and a serving-call session control function (S-CSCF).

 The home subscriber server (HSS) stores all data on user equipment (UE) and user data, and manages user profiles and information management and authorization for managing mobility of the user equipment (UE). And so on. The home subscriber server (HSS) largely provides home location register / authentication (HLR / AUC) functions and IP multimedia functions for IP multimedia services.

Application Server (AS) includes Instant Messaging (IM), Presence, Voice Call Continuity (VCC), Push-To-Talk (PTT), Voice over Internet Protocol (VoIP), Group List Management Server (GLMS), ICS A network element that delivers IP multimedia services to subscribers, including (IMS Centralized Services).

When the UE transmits a service request message (SIP message) to the P-CSCF for the IP multimedia service, the P-CSCF sends the service request message back to the I-CSCF, and the corresponding S in the I-CSCF. -CSCF will be selected. The S-CSCF then provides information related services to the application server (AS) as the endpoint.

That is, when providing a specific service in the IMS network, the S-CSCF delivers the SIP message generated in the user terminal (UE) to the specific application server (AS). In this case, the S-CSCF can deliver the SIP message to the application server only when a specific condition is satisfied, and this is called an IFC trigger, and the initial filter criterion (IFC) is defined for the profile containing the specific condition. It is called).

In the conventional IFC trigger control, (1) an initial filter criterion (IFC) is transferred from a home subscriber server (HSS) to an S-CSCF when a user terminal (REG) registers in an IMS network, and (2) an initial filter. When receiving the IFC, the S-CSCF controls the SIP message delivery to the application server (AS) according to the type and content of the SIP message. That is, conventionally, IFC trigger control was possible based only on information of the IMS network itself.

Therefore, conventionally, even when a plurality of initial filter criteria (IFC) corresponding to a plurality of services (IFC_1, IFC_2, IFC_3, etc.) exist for one user terminal (UE), the IFC trigger is considered in consideration of the characteristics of the service and the user state. It was hard to control. For example, if you want to provide a service that operates only when roaming overseas, or if you want to provide a service that operates only in Seoul, there was no way to simply control it.

Korean Patent No. 10-1585679, "Method of performing ITV in IMS-based system"

The present invention has been proposed to solve the above-described problems, by controlling the delivery of the initial filter criteria (IFC) based on various information stored in the HSS as well as IMS network information to control services according to various situations and specialized in the subscriber state Its purpose is to provide services in IMS networks.

In one embodiment, an IMS network trigger control apparatus based on an initial filter may include: an IFC trigger information collector configured to collect state information and network information of a subscriber station; An IFC trigger controller configured to determine whether to transmit an initial filter criterion to a serving-call session control server by determining whether state information and network information of the subscriber station satisfy an IFC trigger control condition; And a storage unit which stores an IFC trigger control condition table that records at least one IFC trigger control condition corresponding to the initial filter criteria.

The state information of the subscriber station may include at least one of roaming state information and location information of the subscriber station.

The network information may include at least one of IMS network registration status information of a subscriber station and information about a communication network accessed by the subscriber station.

The IFC trigger controller, upon receiving the SAR message from the serving-call session control server according to the IMS network registration of the subscriber station, determines whether the state information and network information of the subscriber station satisfies the IFC trigger control condition, and determines the result of the determination. Accordingly, the initial filter criteria may be included in a SAA message and transmitted to the serving-call session control server.

According to an aspect of the present invention, a system for providing a service according to a subscriber's state by controlling a trigger of an initial filter criterion in an IMS network includes: an application server providing a service corresponding to a message generated at a subscriber station to the subscriber station; A serving-call session control server which determines whether the message satisfies an initial filter criterion and delivers the message to the application server; And a home subscriber server that determines whether the state information and the network information of the subscriber station satisfies the IFC trigger control condition and delivers the initial filter criteria to the serving-call session control server.

The home subscriber server includes: an IFC trigger information collecting unit collecting state information and network information of a subscriber station; An IFC trigger controller for determining whether the initial filter criteria is transmitted to the serving-call session control server by determining whether the state information and the network information of the subscriber station satisfy an IFC trigger control condition; And a storage unit that stores an IFC trigger control condition table that records at least one IFC trigger control condition corresponding to an initial filter criterion (IFC).

The state information of the subscriber station may include at least one of roaming state information and location information of the subscriber station.

The network information may include at least one of IMS network registration status information of a subscriber station and information about a communication network accessed by the subscriber station.

The IFC trigger controller, upon receiving the SAR message from the serving-call session control server according to the IMS network registration of the subscriber station, determines whether the state information and network information of the subscriber station satisfies the IFC trigger control condition, and determines the result of the determination. Accordingly, the initial filter criteria may be included in a SAA message and transmitted to the serving-call session control server.

According to another aspect of the present invention, a method of providing a service according to a subscriber's state by controlling a trigger of an initial filter criterion in an IMS network includes: collecting, by an IFC trigger information, a home subscriber server collecting state information and network information of a subscriber station; And an IFC trigger control step of determining, by the home subscriber server, whether the initial filter criterion is transmitted to the serving-call session control server by determining whether the state information and the network information of the subscriber station satisfy the IFC trigger control condition.

The state information of the subscriber station may include at least one of roaming state information and location information of the subscriber station.

The network information may include at least one of IMS network registration status information of a subscriber station and information about a communication network accessed by the subscriber station.

The IFC trigger control step may include: receiving a SAR message from the serving-call session control server according to an IMS network registration of a subscriber station; Determining whether state information and network information of the subscriber station satisfy the IFC trigger control condition; And including the initial filter criterion in the SAA message and transmitting the initial filter criterion to the serving-call session control server according to the determination result.

In the method for providing a service according to a subscriber's state by controlling the trigger of an initial filter criterion in the IMS network, the serving-call session control server determines whether a message generated in a subscriber station satisfies an initial filter criterion and sends it to an application server. Delivering a message; may further include.

The method for providing a service according to a subscriber's state by controlling the trigger of an initial filter criterion in the IMS network may further include providing, by the application server, a service corresponding to the message to the subscriber station.

According to an embodiment, the service operates according to various states of the subscriber by controlling the trigger of the initial filter criteria (IFC) based on the information collected by the home subscriber server (HSS) operating as the master database of various networks in addition to the IMS network. Can be provided.

1 is a block diagram illustrating an IMS network in which a trigger control system of an initial filter criterion (IFC) is operated according to an embodiment.
FIG. 2 is a block diagram illustrating the function of the home subscriber server (HSS) of FIG.
3 is a flowchart illustrating a trigger control method of an initial filter criterion (IFC) in an IMS network according to an embodiment.
4 is a flowchart illustrating a trigger control step of an initial filter criterion (IFC) of FIG. 3 in detail.

Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. The embodiments of the present invention can be modified in various forms, and the scope of the present invention should not be construed as being limited to the following embodiments. This embodiment is provided to more completely explain the present invention to those skilled in the art. In addition, although specific terms are used in the drawings and the specification of the present invention, they are used only for the purpose of illustrating the present invention and are not used to limit the scope of the present invention as defined in the meaning or the claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible from this. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

In the present specification, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, “comprises” and / or “comprising” refers to the presence of one or more other components, steps, operations and / or elements in the components, steps, operations and / or elements mentioned. Or does not exclude the addition.

Next, a trigger control apparatus and method for initial filter criteria in the IMS network of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram illustrating an IMS network in which a trigger control system of an initial filter criterion (IFC) is operated according to an embodiment.

Referring to FIG. 1, the IMS network 20 may provide various services to a subscriber station 10 (UE) according to a subscriber's situation in an ALL IP based communication environment. The IMS network 20 includes a home subscriber server 100 (HSS), a call session control function (CSCF), and an application server 300 (AS).

The home subscriber server 100 (HSS) is a master database of subscribers and stores basic data on subscribers. Such information includes subscriber identifier (ie number and address information), subscriber security information (ie network access control information for authentication and authorization verification), subscriber location information (ie registration and inter-system level mobility information). ) And service profile information of the subscriber. In addition, the home subscriber server 100 (HSS) operates not only as an IMS network but also as a master database of various networks, and stores access information of various communication networks (3G, LTE, 5G, etc.) as well as the IMS network of the subscriber station 10. have.

Based on the above information, the home subscriber server (100, HSS), based on the various states of the subscriber station 10 as well as the information of the IMS network itself (Serving-Call Session Control Function; S) Control the delivery of Initial Filter Criteria (FCC) to the CSCF. More details will be described with reference to FIG. 2.

The call session control server (CSCF) performs incoming call gateway, call control, serving profile management and address processing functions. Specifically, the call session control server (CSCF) has a proxy-call session control function (P-CSCF), an interrogating-call session control function (I-CSCF), and a serving-call session control function (S-CSCF). The IMS network 20 uses a Session Initiation Protocol (SIP) as a signaling protocol. For example, signaling between the subscriber station 10 and the CSCF, P-CSCF, I-CSCF, and S-CSCF interworking is such a session initiation. Based on protocol (SIP).

P-CSCF acts as a proxy and user agent. The P-CSCF is the first point of point at which the subscriber station 10 accesses the IMS core network. The P-CSCF transfers a Session Initiation Protocol (SIP) registration request message received from the subscriber station 10 to the I-CSCF with reference to the home domain of the subscriber station 10.

I-CSCF is the first point of access point to the subscriber station 10 to the home network, there may be several in one network domain. The I-CSCF receives the address of the S-CSCF that performs SIP registration of the subscriber station 10 from the home subscriber server 100 (HSS), and then allocates the S-CSCF to be in charge of actual registration. In addition, I-CSCF routes SIP messages received from other networks to S-CSCF.

The S-CSCF, hereinafter serving-call session control server 200 (S-CSCF), is registered in the home subscriber server 100 (HSS) so as to correspond to the subscriber station 10, and the information of the subscriber station 10 is a home subscriber. The session control-oriented SIP server transmits to the server 100 (HSS) and stores and maintains subscriber information downloaded from the home subscriber server (100, HSS). In addition, the serving-call session control server 200 (S-CSCF) may provide the subscriber terminal 10 with information related to the service resource.

In addition, the serving-call session control server 200 (S-CSCF) transmits an initial filter criterion (IFC) from the home subscriber server 100 (HSS) together with the subscriber profile when the subscriber terminal 10 registers with the IMS network 20. I can receive it. The serving-call session control server 200 (S-CSCF) transfers the SIP message to the application server 300 (AS) only when a specific condition is met for the SIP message generated at the subscriber station 10. The profile containing the specific condition is an initial filter criterion (IFC).

The application server 300 (AS) includes IM (Instant Messaging), Presence (Voice), Voice Call Continuity (VCC), Push-To-Talk (PTT), Voice over Internet Protocol (VoIP), and Group List Management Server (GLMS). ), A network element for delivering an IP multimedia service including an ICS (IMS Centralized Services) to the subscriber station 10. That is, when the application server 300 (AS) receives the SIP message generated in the subscriber station 10 from the serving-call session control server 200 (S-CSCF), the service corresponding to the SIP message is transmitted to the subscriber station 10. to provide.

FIG. 2 is a block diagram illustrating the function of the home subscriber server (HSS) of FIG. Referring to FIG. 2, the home subscriber server 100 (HSS) may include an IFC trigger information collector 110, an IFC trigger controller 130, and a storage 150.

The IFC trigger information collection unit 110 may collect IFC trigger information such as state information and network information of the subscriber station 10 at predetermined periods. Here, the state information of the subscriber station 10 includes information on at least one of roaming state information (ex, overseas, domestic) and location information (ex, nationwide, Seoul, Seoul, Gyeonggi-do, etc.) of the current subscriber station 10. can do. The network information includes IMS network registration status information of the subscriber station 10 (ex, SAR message generated during IMS registration) and information about an access network (Access RAT Type) accessed by the subscriber station (ex, 3G, LTE, 5G, etc.). ) May include at least one piece of information.

When the subscriber station 10 registers with the IMS network, the IFC trigger control unit 130 receives the IMS network registration related message (eg, SAR message) of the subscriber station 10 from the serving-call session control server 200 (S-CSCF). ). When the subscriber station 10 performing IMS registration according to 3GPP transmits a SIP REGISTER message to the P-CSCF, the P-CSCF, I-CSCF, S-CSCF, and HSS perform various authentication procedures. . Subsequently, the serving-call session control server 200 (S-CSCF) proceeds with a Server Assignment Request procedure to the home subscriber server 100 (HSS) to register the subscriber station 10. At this time, the serving-call session control server (200, S-CSCF) sends a SAR message to the home subscriber server (100, HSS), the home subscriber server (100, HSS) sends a SAA message to the serving-call session control server (200, S-CSCF) Respond.

At this time, the IFC trigger control unit 130 may determine whether IFC trigger information such as state information and network information of the subscriber station 10 collected by the IFC trigger information collection unit 110 satisfies an IFC trigger control condition. Here, the IFC trigger control condition is a condition for transmitting the initial filter criterion (IFC) from the home subscriber server 100 (HSS) to the serving-call session control server 200 (S-CSCF). A plurality can be set for the IFC).

When the IFC trigger control condition is satisfied, the IFC trigger control unit 130 includes an initial filter criterion (IFC) in an IMS network registration related response message (ex, SAA message) to serve-call session control server 200 (S-). CSCF).

The storage unit 150 stores an IFC trigger control condition table that records at least one IFC trigger control condition corresponding to the initial filter criterion (IFC), and stores the IFC trigger control condition table at the request of the IFC trigger control unit 130. The trigger may be transmitted to the controller 130. In this case, the IFC trigger control condition may be set by the administrator and may be updated at regular intervals.

An initial filter criterion (IFC) determines a service to be provided to a user among user information stored in a network, and may be generated for each type of service provided. That is, when a plurality of services are provided for one subscriber station 10, there may be a plurality of initial filter criteria IFC_1, IFC_2,..., IFC_N corresponding to each service. Table 1 below shows an example of an IFC trigger control condition table corresponding to each of the plurality of initial filter criteria IFC_1, IFC_2,..., IFC_N for one subscriber station 10.

TABLE 1

Referring to Table 1, for example, the first initial filter criterion IFC_1 includes two IFC trigger control conditions (roaming-overseas, access network-3G). If the IFC trigger information collected by the IFC trigger information collection unit 110 corresponds to an overseas roaming state and the accessed communication network corresponds to 3G, that is, the IFC trigger information is the first initial filter criterion (IFC_1). When it is determined that the IFC trigger control conditions of S1 are satisfied, the first initial filter criterion IFC_1 may be transmitted to the serving-call session control server 200 (S-CSCF).

3 is a flowchart illustrating a trigger control method of an initial filter criterion (IFC) in an IMS network according to an embodiment, and FIG. 4 is a flowchart illustrating a trigger control step of an initial filter criterion (IFC) in FIG. 3 in detail. .

Referring to FIG. 3, the home subscriber server 100 (HSS) collects IFC trigger information such as state information and network information of the subscriber station 10 at predetermined intervals (S10). Here, the state information of the subscriber station 10 includes information on at least one of roaming state information (ex, overseas, domestic) and location information (ex, nationwide, Seoul, Seoul, Gyeonggi-do, etc.) of the current subscriber station 10. can do. The network information includes IMS network registration status information of the subscriber station 10 (ex, SAR message generated during IMS registration) and information about an access network (Access RAT Type) accessed by the subscriber station (ex, 3G, LTE, 5G, etc.). ) May include at least one piece of information.

Next, the home subscriber server 100 (HSS) determines whether the state information and the network information of the subscriber station 10 satisfy the IFC trigger control condition, and initially filters the serving-call session control server 200 (S-CSCF). An IFC trigger control for determining whether to forward the reference IFC is performed (S20).

Referring to FIG. 4, when the subscriber station 10 registers the IMS network, the home subscriber server 100 (HSS) registers the IMS network of the subscriber station 10 from the serving-call session control server 200 (S-CSCF). Information (ex, SAR message) is received (S21).

When the subscriber station 10 performing IMS registration according to 3GPP transmits a SIP REGISTER message to the P-CSCF, the P-CSCF, I-CSCF, S-CSCF, and HSS perform various authentication procedures. . Subsequently, the serving-call session control server 200 (S-CSCF) proceeds with a Server Assignment Request procedure to the home subscriber server 100 (HSS) to register the subscriber station 10. At this time, the serving-call session control server (200, S-CSCF) sends a SAR message to the home subscriber server (100, HSS), the home subscriber server (100, HSS) sends a SAA message to the serving-call session control server (200, S-CSCF) Respond.

Next, the home subscriber server 100 (HSS) determines whether the IFC trigger information of the subscriber station 10 collected in step S10 satisfies the IFC trigger control condition (S23). Here, the IFC trigger control condition is a condition for transmitting the initial filter criterion (IFC) from the home subscriber server 100 (HSS) to the serving-call session control server 200 (S-CSCF). A plurality can be set for the IFC). At least one IFC trigger control condition corresponding to the initial filter criterion (IFC) is recorded in the IFC trigger control condition table, and the IFC trigger control condition recorded in the IFC trigger control condition table may be set by an administrator, Can be updated.

If the IFC trigger control condition is not satisfied (S23, No), the home subscriber server 100 (HSS) enters a state of receiving IMS network registration information (ex, SAR message) again. If the IFC trigger control condition is satisfied (S23, Yes), the home subscriber server 100 (HSS) proceeds to the next step.

Next, the home subscriber server 100 (HSS) includes an initial filter criterion (IFC) in an IMS network registration related response message (ex, SAA message) and delivers it to the serving-call session control server 200 (S-CSCF). (S25).

An initial filter criterion (IFC) may be generated for each service type, and when a plurality of services are provided for one subscriber station 10, the plurality of initial filter criteria IFC_1, IFC_2,..., IFC_N ) May be present.

Therefore, the home subscriber server 100 (HSS) determines the IFC trigger control conditions that match the current state and the network information of the current subscriber station 10, and as a result of the plurality of initial filter criteria IFC_1, IFC_2, ..., IFC_N ) May extract an initial filter criterion (IFC_X) satisfying all IFC trigger control conditions, and deliver the extracted initial filter criterion (IFC_X) to the serving-call session control server 200 (S-CSCF).

For example, referring to <Table 1>, when the current state of the subscriber station 10 is in an overseas roaming state and accesses 3G, the home subscriber server 100 (HSS) sets the first initial filter criterion (IFC_1). Delivers to serving-call session control server 200 (S-CSCF). Therefore, the home subscriber server (100, HSS) is to pass the initial filter criterion (IFC) to the serving-call session control server (200, S-CSCF) only when roaming overseas to control to provide a service that operates only when roaming overseas As another example, the subscriber may be based on the collected subscriber information or network information, such as controlling the transmission of the initial filter criteria (IFC) so that the service is provided only when located in a specific Access RAT Type (3G, LTE, 5G). Various service operations according to states can be controlled.

Next, the serving-call session control server 200 (S-CSCF) determines the initial filter criteria 10 in which the message generated in the subscriber station 10 is stored by the serving-call session control server 200 (S-CSCF). It determines whether it satisfies and delivers the message to the application server (300, AS) (S30).

For example, the serving-call session control server 200 (S-CSCF) receives only the second initial filter criterion (IFC_2) of Table 1 from the home subscriber server 100 (HSS) and is stored in the subscriber station (S-CSCF). When receiving the SIP message from 10), it is possible to determine whether the SIP message satisfies the second initial filter criterion (IFC_2) to trigger the SIP message to the application server (300, AS).

Next, the application server 300 (AS) provides a service corresponding to the SIP message transmitted from the serving-call session control server 200 (S-CSCF) to the subscriber station 10 (S40).

While this specification contains many features, such features should not be construed as limiting the scope of the invention or the claims. Also, the features described in the individual embodiments herein can be implemented in combination in a single embodiment. Conversely, various features described in a single embodiment herein can be implemented individually in various embodiments or in combination as appropriate.

Although the operations are described in a particular order in the drawings, they should not be understood as being performed in a particular order as shown, or in a sequence of successive orders, or all described actions being performed to obtain a desired result. . Multitasking and parallel processing may be advantageous in certain circumstances. In addition, it should be understood that the division of various system components in the above-described embodiments does not require such division in all embodiments. The program components and systems described above may generally be packaged in a single software product or multiple software products.

The method of the present invention as described above may be implemented as a program and stored in a recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.) in a computer-readable form. Since this process can be easily implemented by those skilled in the art will not be described in more detail.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited by the drawings.

10: subscriber station 20: IMS network
100: home subscriber server (HSS) 110: IFC trigger information collection unit
130: IFC trigger control unit 150: storage unit
200: serving-call session control server (S-CSCF) 300: application server (AS)

Claims (15)

In the trigger control device of the initial filter criteria in the IMS network,
An IFC trigger information collecting unit collecting state information and network information of the subscriber station;
An IFC trigger controller configured to determine whether to transmit an initial filter criterion to a serving-call session control server by determining whether the state information and network information of the subscriber station satisfy an IFC trigger control condition; And
A storage unit for storing an IFC trigger control condition table recording at least one IFC trigger control condition corresponding to an initial filter criterion;
Trigger control device of the initial filter criteria in the IMS network comprising a. The method of claim 1,
Status information of the subscriber station,
Trigger control device for the initial filter criteria in the IMS network, characterized in that it comprises at least one of roaming state information and location information of the subscriber station. The method of claim 1,
The network information,
And an IMS network registration state information of a subscriber station and information on at least one of information on a communication network accessed by the subscriber station. The method according to any one of claims 1 to 3,
The IFC trigger control unit,
Upon receiving the SAR message from the serving-call session control server according to the IMS network registration of the subscriber station, it is determined whether the state information and the network information of the subscriber station satisfy the IFC trigger control condition. Trigger control device for the initial filter criteria in the IMS network, characterized in that included in the SAA message and delivered to the serving-call session control server. In the system for providing a service according to the status of the subscriber by controlling the trigger of the initial filter criteria in the IMS network,
An application server providing a service corresponding to a message generated in the subscriber terminal to the subscriber terminal;
A serving-call session control server which determines whether the message satisfies an initial filter criterion and delivers the message to the application server; And
And a home subscriber server for determining whether the state information and the network information of the subscriber station satisfies an IFC trigger control condition and forwarding the initial filter criteria to the serving-call session control server. The method of claim 5,
The home subscriber server,
An IFC trigger information collecting unit collecting state information and network information of the subscriber station;
An IFC trigger control unit for determining whether the initial filter criterion is transmitted to the serving-call session control server by determining whether the state information and the network information of the subscriber station satisfy an IFC trigger control condition; And
And a storage unit for storing an IFC trigger control condition table recording at least one IFC trigger control condition corresponding to an initial filter criterion (IFC). The method of claim 6,
Status information of the subscriber station,
And at least one of roaming state information and location information of the subscriber station. The method of claim 6,
The network information,
And at least one of IMS network registration status information of the subscriber station and information on a communication network accessed by the subscriber station. The method according to any one of claims 6 to 8,
The IFC trigger control unit,
Upon receiving the SAR message from the serving-call session control server according to the IMS network registration of the subscriber station, it is determined whether the state information and the network information of the subscriber station satisfy the IFC trigger control condition, and the initial filter criteria is determined according to the determination result. Included in the SAA message and delivered to the serving-call session control server. In the method of providing a service according to the state of the subscriber by controlling the trigger of the initial filter criteria in the IMS network,
An IFC trigger information collection step of collecting, by the home subscriber server, state information and network information of the subscriber station; And
And determining, by the home subscriber server, whether or not the initial filter criteria are delivered to the serving-call session control server by determining whether the state information and the network information of the subscriber station satisfy the IFC trigger control condition. The method of claim 10,
Status information of the subscriber station,
And at least one of roaming state information and location information of the subscriber station. The method of claim 10,
The network information,
And at least one of IMS network registration status information of the subscriber station and information on a communication network accessed by the subscriber station. The method according to any one of claims 10 to 12,
The IFC trigger control step,
Receiving a SAR message from the serving-call session control server according to an IMS network registration of a subscriber station;
Determining whether state information and network information of the subscriber station satisfy the IFC trigger control condition; And
And including the initial filter criteria in the SAA message according to the determination result and transmitting the initial filter criterion to the serving-call session control server. The method of claim 13,
Determining, by the serving-call session control server, whether a message generated at a subscriber station satisfies an initial filter criterion and delivering the message to an application server;
How to include more. The method of claim 14,
Providing, by the application server, a service corresponding to the message to the subscriber station;
How to include more.

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