KR20100131787A - Method anc device for processing a call in an ip multimedia subsystem network - Google Patents

Abstract

PURPOSE: A method and a device for processing a call of IMS network are provided to check subscriber information of sending terminal in an application server even in a network without SCIM(Service Capability Interaction Manager). CONSTITUTION: A terminal transmits a session setting message to a P-CSCF(Proxy-Call Session Control Function)(S300). A S-CSCF(Serving-Call Session Control Function) rests the session setting message(S320). The S-CSCF transmits the reset session setting message to an AS(Application Server)(S330). The terminal receives session progress response corresponding to the session setting message from the AS(S340). The AS transmits the session progress response to the terminal(S350).

Description

Method and apparatus for call processing of IMS network {METHOD ANC DEVICE FOR PROCESSING A CALL IN AN IP MULTIMEDIA SUBSYSTEM NETWORK}

The present invention relates to a method and apparatus for call processing in an IMS network.

Recently, there are not only circuit switching based communication networks such as CDMA (Code Division Multiple Access) networks, but also packet switching based communication networks, especially IP based communication. An IP Multimedia Subsystem (IMS) network is used.

Currently, 3GPP uses an IP-based network reference model to provide IMS services. Subscribers can use non-real-time services such as file transfer, email, and short message as well as real-time services such as voice and video through IMS network.

The IMS network includes a CSCF providing session control based on a packet service domain and an HSS storing location information of a subscriber. Application servers providing IMS services are managed through SCIM, and multiple application servers are managed through SCIM. In this case, the SCIM may acquire subscriber information accessing the application server in association with the HSS through the HSS. However, there is a problem that call processing cannot be performed in an application server without SCIM because the subscriber information of the subscriber station requesting service to the application server cannot be confirmed.

An object of the present invention is to propose a method and apparatus for call processing in an IMS network that can confirm subscriber information in an AS by resetting a session establishment message to include IRS information in a representative number field in a CSCF.

Another object of the present invention is to propose a method and apparatus for processing a call in an IMS network, which provides a session establishment message including subscriber information in addition to the IRS information in a session establishment message to a CSCF.

According to an aspect of the present invention, a call processing method of an IMS network for transmitting a session establishment message to an application server in CSCF, the method comprising: (a) receiving a session establishment message for requesting session establishment from an originating terminal; (b) resetting the session establishment message to include subscriber address information previously stored in the representative number field of the session establishment message; And (c) transmitting the reset session establishment message to an application server.

In the present invention, the subscriber address information may be information stored when a subscriber of the calling terminal registers a location in a Call Session Control Function (CSCF).

In addition, in the present invention, the resetting of the session establishment message may be performed in the S-CSCF included in the CSCF.

The present invention may further include receiving a response message corresponding to the reset session establishment message from the application server; And transmitting the response message to the calling terminal.

According to another aspect of the present invention, a call processing apparatus of an IMS network for transmitting a session establishment message to an application server, comprising: a P-CSCF for receiving a session establishment message for requesting session establishment from an originating terminal; And an S-CSCF for resetting the session establishment message to include subscriber address information previously stored in the representative number field of the session establishment message received from the P-CSCF, and transmitting the reset session establishment message to an application server. A call processing apparatus of an IMS network is provided.

The method and apparatus for processing a call in an IMS network according to the present invention has an advantage that an application server can check subscriber information of an originating terminal even in a network without a SCIM (Service Capability Interaction Manager) managing an application server.

In addition, the call processing method and apparatus of the IMS network according to the present invention has the advantage that the billing process can be freely performed even if the subscriber with the IRS information receives the IRS information from the application server.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all transformations, equivalents, and substitutes included in the spirit and scope of the present invention. In the following description of the present invention, if it is determined that the detailed description of the related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In order to facilitate a thorough understanding of the present invention, the same reference numerals are used for the same means regardless of the number of the drawings.

Prior to the detailed description of the drawings, it is intended to clarify that the division of the components in the present specification is only divided by the main function of each component. That is, two or more components to be described below may be combined into one component, or one component may be provided divided into two or more for each function. Each of the components to be described below may additionally perform some or all of the functions of other components in addition to the main functions of the components, and some of the main functions of each of the components are different. Of course, it may be carried out exclusively by. Therefore, the presence or absence of each component described through this specification should be interpreted functionally.

1 is a block diagram illustrating a communication system according to an embodiment of the present invention.

1, a communication system according to the present invention includes a terminal 100, an IP Multimedia Subsystem (hereinafter referred to as "IMS") network 200 and an Application Server (hereinafter referred to as "AS"). 300).

In more detail, the terminal 100 may include a mobile communication terminal using a mobile communication network, a terminal using a wired communication network, and the like.

The IMS network 200 includes a domain name server (hereinafter referred to as "DNS") 250, a home subscriber server (hereinafter referred to as "HSS") 240 and a call session control function. A Call Session Control Function (hereinafter referred to as "CSCF") 150 is included.

Specifically, the IMS network 200 is a communication network based on a communication network standard proposed by the 3rd Generation Partnership Project (3GPP). The IMS network 200 provides an IP (Internet Protocol) based communication service and mainly uses a session initiation protocol. Signaling protocol ("SIP"). The IMS network 200 may be used as a secondary network of a mobile communication network or a wired communication network such as WCDMA.

DNS 250 stores address information, port information, and transmission information to which a register message is delivered. The DNS 250 provides the stored query information to the P-CSCF 210 according to the query request message received from the P-CSCF 210. In this case, the query information includes address information, port information, and transmission information to which the above-described address message is delivered.

The HSS 240 is a centralized database for managing subscriber information and is a kind of development in the home location register of mobile communication. HSS 240 supports IMS entities that perform session control with a user information database. The HSS 240 stores user related subscription information related to multimedia session control, that is, user location information, security information for authentication and permission of the user, and user profile information including a service subscribed to by the user. The HSS 240 provides the stored user profile information to the CSCF 150 when the authority setting information request is received from the CSCF 150.

The HSS 240 has a public ID which is an ID of an address concept used for call processing between subscribers. Public ID consists of SIP-URI and TEL-URI and is stored in IRS (Implicit REGISTER Set). If a public ID is registered as one of the IRSs, all other IDs in the IRS are registered at the same time.

The CSCF 150 performs basic functions for SIP-based session control such as subscriber registration, authentication, service triggering, routing, various call control, and address processing.

The CSCF 150 performs a function related to call processing in the IMS network 200. CSCF 150 has a different function depending on the network in which the subscriber is located, based on the location and function of the CSCF 150, P-CSCF (210), Interrogating-CSCF (I-CSCF) 220, S It is logically divided into a serving-CSCF (CSCF) 230.

The P-CSCF 210 is a SIP proxy server that becomes the first point for the terminal 100 to access the IMS network 200. The P-CSCF 210 may be in a home network or a visited network. The terminal 100 needs to acquire location information of the P-CSCF 210 to be connected, which may be obtained through a dynamic host configuration protocol (DHCP). The P-CSCF 210 is assigned to the terminal 100 at the time of registration in the IMS network 200 and does not change during the registration period. In addition, the P-CSCF 210 performs policy control, band management, and quality of service (QoS) control. P-CSCF 210 is included in the path of all signaling messages and checks all messages.

The P-CSCF 210 transfers the session establishment message INVITE received from the terminal 100 to the I-CSCF 220. To this end, the P-CSCF 210 sends and receives DNS queries to obtain address information of the I-CSCF 220 from the DNS 250.

The I-CSCF 220 is located at the boundary of the management domain when no border function exists. Therefore, the IP address is disclosed to the DNS 250 of the domain so that a server of another domain can find the I-CSCF and use it as an input node of the network. The I-CSCF 220 queries the HSS 240 for the location of the called terminal using the Cx or / and Dx interface and sends a SIP message (eg, a location registration message) to the S-CSCF 230 to which the called terminal is assigned. Etc.).

S-CSCF 230 performs session control as one SIP server as a central node of the signaling layer. When the SIP is registered, the location of the calling terminal 100 and the called terminal and the SIP address are bound. S-CSCF 230 is included in the path of all signaling messages and checks all messages. In addition, the S-CSCF 230 determines a server to provide a service, and routes a session establishment message (INVITE) to the AS (300).

When the S-CSCF 230 receives the session establishment message (INVETE) from the P-CSCF 220, the S-CSCF 230 inserts all of the IRS information received at the time of location registration from the HSS 240 through a specific header.

The AS 300 is a server providing a telephony service, and may include a SIP protocol application server, an open service access point providing server, an IMS switch server, and the like. The AS 300 transmits a session establishment message (INVITE) to the target of the session establishment message.

The AS 300 receives a message “183 SECESSION PROGRESS”, which is a response message corresponding to the session establishment message INVITE, from the called terminal and transmits the same to the CSCF 150.

FIG. 2A illustrates a session setup message when the sender sets up an INVITE session using TEL-URI information, and FIG. 2B illustrates SIP-URI information in the IRS when the sender sets up an INVITE session using TEL-URI information. FIG. 1 shows an example of an inserted session establishment message.

As shown in FIG. 2B, the session establishment message INVITE is changed by converting the representative number information, for example, a value included in the P-Asserted-Identity into a value included in the P-Associated-URI.

That is, P-Asserted-Identity of the session establishment message INVITE shown in FIG. 2A: tel + 821029172115, and a value included in P-Asserted-Identity of the session establishment message INVITE shown in FIG. 2B. [email protected]; user = phone>, <sip: [email protected]> ". At this time, the messages of "TEL: 821029172115" and "SIP: 821029172115 @ KTF.COM, user = phone" are the same ID. However, "SIP: [email protected]" of "SIP: 821029172115 @ KTF.COM, user = phone" is another ID. That is, the ID may be changed depending on the existence of "user = phone". As above, the S-CSCF resets the session establishment message (INVITE) to include not only the TEL information but also other ID information.

For example, when a terminal establishes a session with TEL-URI, all the values included in the IRS are transmitted. When the session establishment message (INVITE) is transmitted to the AS, the TEL-URI is changed to the SIP-URI. At this time, the session establishment message (INVITE) is reset including other SIP-URIs in the IRS. Therefore, when the terminal establishes a session with the SIP-URI, it may be included with another ID (ie, TEL-URI or SIP-URI) in the IRS.

When the IRS information is included in the session establishment message (INVITE) as described above, the AS shares the subscriber information included in the HSS through the conventional SCIM and acquires the information of the originating terminal. Subscriber information can be obtained. And since the IRS information of the subscriber can be obtained from the AS, there is an advantage in that the billing process can be freely performed by any subscriber included in the IRS.

3 is a flowchart illustrating a call processing method for location registration in an originating terminal.

Referring to FIG. 3, the P-CSCF 210 receives a location registration message (REGISTER) from the calling terminal 100 (S210).

The P-CSCF 210 obtains the address of the I-CSCF 220 by querying DNS (not shown), and transmits a location registration message (REGISTER) received from the calling terminal 100 to the I-CSCF 220. (S220).

When the I-CSCF 220 receives the location registration message (REGISTER) from the P-CSCF 210, the I-CSCF 220 transmits a UAR requesting the address of the S-CSCF 230 from the HSS 240 and receives the requested address ( UAA) (S230). Here, the UAA may include information such as a feasibility study result or a performance list of the subscriber station. Subsequently, the I-CSCF 220 transmits a location registration message (REGISTER) to the corresponding S-CSCF 230 (S240).

Upon receiving the location registration message from the I-CSCF 220, the S-CSCF 230 transmits a server assignment request message to the HSS 240 and receives a corresponding server assignment response message. In this case, the S-CSCF 230 receives subscriber profile information stored in the HSS 240 to generate and store an initial filter condition (iFC), which is an initial filtering condition. In addition, the S-CSCF 230 requests the IRS information of the calling terminal 100 from the HSS 240 and receives and stores corresponding IRS information.

In the above description, the IRS information may include a unique URI and a public URI of the calling terminal.

4 is a flowchart illustrating a call processing method for providing subscriber information to an application server when establishing a session according to an embodiment of the present invention.

Referring to FIG. 4, in a call processing method of providing subscriber information to an application server during session establishment, the terminal transmits a session establishment message to the CSCF (S300), a step of resetting the session establishment message (S320), and a reset session. The method may include transmitting a setup message to the AS (S330), receiving a session progress response corresponding to the session setup message from the AS (S340), and transmitting a session progress response to the terminal (S350).

In the following description, call setup between the calling terminal and the called terminal will be described as an example. However, the called party may be an application server other than the called terminal.

In detail, in operation S300 of transmitting a session establishment message to the CSCF, the terminal transmits a session establishment message INVITE to the P-CSCF 210 of the CSCF. In this case, the session establishment message INVITE includes the representative number information of the called party, for example, TEL-URI information in P-Asserted-Identity.

The P-CSCF 210 transmits a session establishment message (INVITE) to the S-CSCF 230 of the address stored at the time of location registration (S310).

Subsequently, in step S320 of resetting the session establishment message, the S-CSCF 230 resets the session establishment message INVITE using the stored IRS information received from the HSS 240 at the S-CSCF 230 when registering the location of the terminal 100. . In other words, the S-CSCF 230 resets the session establishment message INVETE by changing the representative number information of the session establishment message INVETE to include all IRS information of the calling terminal.

The S-CSCF adds the stored IRS information to the contents of the P-Asserted-Identity in the SIP message of the session establishment message (INVITE) received from the P-CSCF. In this case, the content of the P-Asserted-Identity may include data including a predetermined IP address or subscriber information in addition to the IRS information. Since this is the same as described with reference to FIG. 2, duplicate descriptions will be omitted.

Next, in step S330 of transmitting the reset session establishment message to the AS, the session establishment message reset by the S-CSCF 230 transmits the reset session establishment message to the AS 300 through an iFC trigger.

Next, the AS 300 transmits to the called party address using the called party's phone number or IP information included in the session establishment message INVITE (S340). In this case, the called party may be a communication terminal or an AS.

Receiving a session progress response from the AS (S350) and transmitting a session progress response to the terminal (S360) receives a "183 SESSION PROCESS" message corresponding to the session setup message reset in the AS 300 from the called party, This is transmitted to the S-CSCF 230 of the calling terminal.

Specifically, the called terminal receiving the session establishment message transmits the message “183 SESSION PROCESS”, which is a session establishment progress message, to the AS 300 in response to the session establishment message.

The AS 300 transmits the received “183 SESSION PROCESS” message to the calling terminal through the S-CSCF 230, the I-CSCF 220, and the P-CSCF 210 of the calling party. Here, the S-CSCF 230 receiving the "183 SESSION PROCESS" message uses the P-Assoiciaed-URI in the header of the message transmitted to the terminal 100 and may include IRS information of the called terminal.

Next, the terminal that receives the message "183 SESSION PROCESS" transmits a PRACK message to the receiving side to confirm the message "183 SESSION PROCESS". At this time, resource reservation is started between the subscriber network of the terminal and the IMS network. In addition, the receiving side transmits a 200 OK for accepting the request to the calling terminal in response to the PRACK message.

Next, the calling party terminal 100 updates to the called party, and the called party sends a 200 OK message and a 180 ringing message to the calling party terminal 100.

Subsequently, the receiving side receiving the 180 ringing message transmits a PRACK message to the calling terminal 100 to confirm the 180 ringing message, and the receiving side transmits 200 OK to the calling terminal 100 to respond to the PRACK. Do it.

The called party may use a separate IMS network. In this case, messages transmitted to the called party may be sent to the called terminal or AS through the CSCF of the IMS network.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It will be understood that the invention may be varied and varied without departing from the scope of the invention.

1 is a block diagram illustrating a communication system according to an embodiment of the present invention.

2A is a diagram illustrating a session establishment message when a caller establishes an INVITE session with TEL-URI information.

2B is a diagram illustrating an example of a session establishment message in which SIP-URI information is inserted in an IRS when a caller establishes an INVITE session using TEL-URI information.

3 is a flowchart illustrating a call processing method for location registration in an originating terminal.

4 is a flowchart illustrating a call processing method for providing subscriber information to an application server when establishing a session according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

100: terminal

200: IMS network

210: P-CSCF (Proxy CSCF)

220: I-CSCF

230: S-CSCF (Service CSCF)

240: home subscriber server (HSS)

250: DNS

300: AS (application server)

Claims (8)

In the call processing method of the IMS network transmitting a session establishment message to the application server in CSCF, (a) receiving a session establishment message requesting session establishment from an originating terminal; (b) resetting the session establishment message to include subscriber address information previously stored in the representative number field of the session establishment message; And (c) transmitting the reset session establishment message to an application server. The method of claim 1, And the subscriber address information is information stored when a location is registered in a call session control function (CSCF) by the calling terminal. The method of claim 2, Step (b) is The resetting of the session establishment message is performed in the Serving-CSCF (S-CSCF) included in the CSCF. The method of claim 1, After step (c), Receiving a response message corresponding to the reset session establishment message from the application server; And And transmitting the response message to the calling terminal. The method of claim 4, wherein Receiving the response message and resetting the response message to include the subscriber side additional information of the called party in the representative number field of the response message. A call processing apparatus of an IMS network for transmitting a session establishment message to an application server, A P-CSCF receiving a session establishment message requesting session establishment from an originating terminal; And An IMS including an S-CSCF for resetting the session establishment message to include subscriber address information previously stored in the representative number field of the session establishment message received from the P-CSCF, and transmitting the reset session establishment message to an application server; Network call processing device. The method of claim 6, And the subscriber address information is information stored in the S-CSCF when a location is registered in the calling terminal. The method of claim 6, A call of an IMS network including an HSS storing subscriber information and a C-CSCF receiving the subscriber information from the HSS and transmitting the register message to the S-CSCF when a register message for location registration is received from the calling terminal. Processing unit.

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