KR20080049403A - Method and system for establishing session in internet protocol multimedia service - Google Patents

Abstract

A method and a system for establishing an SIP session in an IP multimedia service are provided to enable a calling terminal to transfer an SIP session generation request message to a CSCF for an IP multimedia service to perform processes related to the SIP session generation request message in plural application servers, thereby managing service sessions efficiently. An IP(Internet Protocol) multimedia service system comprises plural application servers(210,220,230), a P-CSCF(Proxy Call Session Control Function)(140), and an S-CSCF(Serving Call Session Control Function)(150). The plural application servers perform a service logic for providing an IP multimedia service. The P-CSCF receives an SIP(Session Initiation Protocol) session generation request message from terminals(110,120,130). The S-CSCF receives an SIP session generation request message from the P-CSCF, extracts media property information included into the SIP session generation request message to transfer the SIP session generation request message to the plural application servers on the basis of iFC(initial Filter Criteria) in preset priority.

Description

Method and system for establishing SIP session in IP multimedia service {METHOD AND SYSTEM FOR ESTABLISHING SESSION IN INTERNET PROTOCOL MULTIMEDIA SERVICE}

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view for explaining a session establishment method for IP multimedia service when a plurality of conventional application server processes are required.

2 is a diagram illustrating a system for establishing a SIP session for an IP multimedia service according to an embodiment of the present invention.

3 is a diagram illustrating a SIP session establishment method for an IP multimedia service according to an embodiment of the present invention.

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

110: first terminal 120: second terminal

130: third terminal 140: P-CSCF

150: S-CSCF 210: first application server

220: second application server

The present invention relates to a method and a system for establishing a session initiation protocol (hereinafter referred to as "SIP") in an IP multimedia service, and more particularly, to a plurality of application servers (AS). The present invention relates to a method and system for forming an effective SIP session in an IP multimedia service requiring processing.

The present invention relates to a method for establishing a SIP session in an IP Multimedia Subsystem (IMS) service (hereinafter referred to as "IP Multimedia Service"). In particular, the present invention relates to an efficient SIP session establishment method in the case where defined media in a SIP message cannot be processed by one application server, that is, when a plurality of application server processes are required.

In response to the rapid development of mobile communication and Internet technology and various demands of subscribers, the recent mobile communication service provides a high-speed packet data service capable of transmitting a large amount of video files as well as an e-mail or image file to a mobile terminal as well as a conventional voice call service. Can provide. Accordingly, the mobile communication system is evolving from voice based CS (Circuit Switched) domain to packet based PS (Packet Switched) domain, and further evolved into IP based core network. The communication system that provides IP multimedia service to subscribers through the IP-based core network is called IP multimedia service, and the 3GPP (Third Generation Partnership Project) is conducting various studies to provide ALL IP service through IP multimedia service.

IP multimedia services consist of a collection of signaling and bearers associated with network elements and must have access to voice, video, message data and web-based technologies for wireless subscribers. In addition, since IP multimedia services provide various types of packet data services based on IP transport protocols, users of IP multimedia services exchange contents of multimedia types such as pictures, video clips, and sound clips through session-based messages. can do.

An important functional element of the so-called IP multimedia subsystem for providing IP multimedia services is the call session control function (CSCF) that performs registration and multimedia call processing using SIP and the home location of the existing mobile communication network. Home Subscriber Server (HSS) which integrates and manages mobility management and authentication of IP multimedia service user to Home Location Register (HLR).

In addition, the SIP protocol is used to provide independence of the existing Internet network and connectivity and access network in the IP multimedia service. SIP is used as a signaling protocol for creating, modifying or terminating an IP multimedia service session, and its role is to exchange information for controlling a message session between subscribers who want to exchange messages. Since SIP messages transmitted over SIP operate regardless of User Datagram Protocol (UDP) and Transmission Control Protocol (TCP), they are independent of the underlying transport protocol and use the Session Description Protocol (SDP) to negotiate session information. Used as the message body.

FIG. 1 is a diagram for describing a method for establishing a session for an IP multimedia service when a plurality of conventional application server processes are required.

The originating terminal 110 establishes a session with the first application server 210 and the second application server 220 to receive one IP multimedia service through the first application server 210 and the second application server 220. do. For example, when the originating terminal 110 requests the video chat service, the first application server 210 performing service logic for the video data for the video chat and the text data for the video chat. Sessions are formed in the second application server 220 that performs the service logic, respectively, and may receive a video chat service with the called terminal 120.

Referring to FIG. 1, the originating terminal 110 first calls a Call Session Control Function (CSCF) in order to establish a session with a plurality of application servers 210 and 220. Each session creation request message (INVITE message) is sent to 145).

The CSCF 145 performs a call request with the SIP session creation request message for each of the intermediate first and second application servers 210 and 220. For example, when the calling terminal 110 requests a video chat service, a SIP session creation request message for processing video data for video chat and a SIP session creation request message for processing text data for video chat are requested. Each delivers to the CSCF 145. The CSCF 145 performs a call request to the first application server 210 and the second application server 220, which are intermediate nodes, performs service logic for each service in the corresponding application server, and then performs a corresponding IP multimedia. The SIP session creation request message for the service may be delivered to the called terminal 120.

When a plurality of application server processes are required to provide a conventional application service, a plurality of sessions are formed for one IP multimedia service, which makes it difficult to manage service related sessions. For example, there are different times when multiple sessions are created, and multiple sessions must be mapped to a single service.

In addition, when a plurality of sessions are formed for one IP multimedia service, there is a problem in that a load of data transmission is increased in a wireless terminal.

Accordingly, the present invention has been made to solve the above-described problem, an object of the present invention is to send one SIP session creation request message (INVITE message) at the calling terminal for one IP multimedia service call session control function ( The present invention provides a method and system for forming a SIP session in an IP multimedia service capable of efficiently managing service-related sessions by delivering to a CSCF.

In addition, another object of the present invention is to transmit one SIP session creation request message from the calling terminal to the call session control function (CSCF) for one IP multimedia service to process a plurality of application server data at the wireless end The present invention provides a method and system for establishing a SIP session in an IP multimedia service that can reduce the load of transmission.

Other objects of the present invention will be readily understood through the following description.

According to an aspect of the present invention for achieving the above object, an IP multimedia service system that requires processing of a plurality of application servers (AS) in order to receive one IP multimedia service (IP Multimedia Service) is Proxy call session control for receiving a session establishment request message (Session Initiation Protocol: hereinafter referred to as " SIP ") from a plurality of application servers that perform service logic for providing IP multimedia services, and a terminal Receives the SIP session creation request message from a Proxy Call Session Control Function (P-CSCF) and the proxy call session control function, and extracts media feature information included in the SIP session creation request message. The plurality of responses according to an initial filter criteria (iFC) in a predetermined priority order. It may include a Serving Call Session Control Function (S-CSCF) for delivering the SIP session creation request message to the server for the service.

According to another aspect of the present invention, a SIP session establishment method in a serving call session control function for an IP multimedia service that requires processing of a plurality of application servers in order to receive a single IP multimedia service includes (a) an originating terminal. Receiving a SIP session creation request message through a proxy call session control function (P-CSCF) from the server; (b) determining whether the media characteristic information extracted from the SIP session creation request message satisfies the initial filtering criteria (iFC) (C) if the media characteristic information of the SIP session creation request message satisfies an initial filtering criterion (iFC), the SIP session creation request message is sent to a corresponding application server to perform a corresponding service logic. (D) performing the service logic corresponding to the media characteristic information from the application server and then performing the SIP request message. (B) repeating steps (b) to (d) until all service logic corresponding to the media characteristic information is performed and delivering the received SIP session creation request message to a called terminal; It may include.

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 modifications, equivalents, and substitutes included in the spirit and scope of the present invention. In describing the drawings, similar reference numerals are used for similar elements.

Terms including ordinal numbers such as first and second may be used to describe various components, but the components are not limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component. The term and / or includes a combination of a plurality of related items or any item of a plurality of related items.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

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.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, and the same or corresponding components will be denoted by the same reference numerals regardless of the reference numerals and redundant description thereof will be omitted. 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.

2 is a diagram illustrating a system for establishing a SIP session for an IP multimedia service according to an embodiment of the present invention.

FIG. 2 is a network diagram showing a configuration of an IP multimedia subsystem in which sessions are formed using a plurality of application servers according to the present invention. Call session control function (CSCF) 140, 150, terminals 110, 120, 130 in communication with call session control function (CSCF) 140, 150, and a plurality of intermediate nodes It is divided into application servers 200, 210, and 220.

The call session control function (CSCF) is a proxy call session control function (hereinafter referred to as "P-CSCF") 140 according to its position and role, the serving call session control function (Serving) Call Session Control Function (hereinafter referred to as "S-CSCF") 150 and an information transfer call session control function (Interrogating Call Session Control Function: referred to as "I-CSCF" hereinafter) (not shown) . The functions of the call session control functions (CSCFs) are as follows.

The P-CSCF 140 is the first point of access of the terminal to the IP multimedia service network and exists in the same domain as the Gateway GPRS Serving Node (GGSN). The main role is to act as a proxy and a user agent (request) or request (response) the SIP message with the terminal. The home domain of the SIP message received from the terminal is transferred to the S-CSCF or I-CSCF.

The S-CSCF 150 performs a session state management and control service of an actually registered terminal and provides information related to service resources to the terminal. It receives subscriber information by interworking with Home Subscriber Server (HSS) and provides services such as application server interworking function through initial filtering criteria (iFC).

I-CSCF (not shown) performs a firewall function when transferring SIP messages between different domains as a first point of access to a network to which a terminal subscribes. Then, the SIP message received from the other network is transferred to the S-CSCF.

The application servers 200, 210, and 220 are servers for providing IP multimedia services. The number and configuration of the application servers 200, 210, and 220 may vary depending on the type of IP multimedia service. For example, the application server 200, 210, or 220 may be an application server for image data processing or an application server for text data processing for providing a video chat service to the terminals 110, 120, and 130.

The first terminal 110, the second terminal 120, and the third terminal 130 are communication terminals capable of using IP multimedia data communication, and for example, various types of mobile phones, personal digital assistants (PDAs), computers, and the like. It may be a digital electronic device.

Referring to the network configuration for the IP multimedia service of FIG. 2, a method of establishing a SIP session for a video chat service will be described briefly. In the first terminal 110, address information of a receiving terminal and media characteristic information for a video chat are described. The SIP session creation request message including the message is transmitted to the P-CSCF 140. The P-CSCF 140 forwards the corresponding SIP session creation request message to the S-CSCF 150 in charge of actual session processing, and provides the video chat service according to the initial filtering criteria (iFC) in order of priority. It transmits the image characteristic information for the first application server 210 to be processed.

 The first application server 210 performs service logic for video characteristic information for video chat on the received SIP session creation request message, and prepares the corresponding SIP session creation request message according to the receiving terminal address included in the message. A SIP session creation request message for each of the second terminal 120 and the third terminal 130 may be generated and delivered to the S-CSCF 150.

The S-CSCF 150 performs evaluation on the remaining initial filtering criteria (iFC) after the previously processed priority for the corresponding message received, and the text characteristic information for the video chat service in the initial filtering criteria (iFC). If there is, the service logic for delivering the message to the corresponding second application server 220, processing the text characteristic information for the video chat service in charge of the second application server 220 is performed, S- It is delivered to the P-CSCF 140 through the CSCF 150, the P-CSCF 140 delivers a SIP session creation request message to the second terminal 120 and the third terminal 130, the second terminal ( 120 and the third terminal 130 accepts a session creation for the message, one session (dialog of the session generated between the first terminal 110, the second terminal 120 and the third terminal) Is the same) is used to provide the corresponding video chat service.

3 is a view for explaining a SIP session establishment method for an IP multimedia service according to an embodiment of the present invention.

Referring to FIG. 3, a SIP session establishment method for providing an IP multimedia service will be described. In step S310, address information of the second terminal 120 and the third terminal 130, which are the receiving terminal from the first terminal 110, and The SIP session creation request message including the media characteristic information is transmitted to the P-CSCF 140.

In step S320, the P-CSCF 140 transmits the corresponding SIP session creation request message to the S-CSCF 150 in charge of actual session processing.

In step S330, the S-CSCF 150 extracts the media characteristic information included in the SIP session creation request message according to the initial filtering criteria (iFC) in order of priority with respect to the corresponding SIP session creation request message to obtain the corresponding media characteristic information. Send to the first application server 210 to be processed. It is apparent that the S-CSCF 150 may transmit a SIP session creation request message to another CSCF or another application server according to an initial filtering criteria (iFC) evaluation result.

The S-CSCF 150 may analyze media characteristic information included in a corresponding SIP session creation request message according to an initial filtering criterion (iFC), and may include address information of an application server for providing a corresponding IP multimedia service. .

In operation S340, the first application server 210 performs service logic necessary for the received SIP session creation request message. In addition, the first application server 210 requests the SIP session creation request for each of the second terminal 120 and the third terminal 130 according to the reception terminal address included in the SIP session creation request message. The message is delivered to the S-CSCF 150 by separating (creating) the message.

In step S350, the S-CSCF 150 performs the remaining initial filtering criteria after the prior processing priority for the SIP session creation request message for each of the received second terminal 120 and the third terminal 130 (iFC). Evaluation is performed to determine whether the corresponding SIP session creation request message meets the initial filtering criteria (iFC).

In operation S360, as a result of the determination, the S-CSCF 150 transmits the second terminal 120 and the second application server 220 to the second application server 220 when the second application server 220 has a portion suitable for the initial filtration criterion (iFC). 3 The terminal 130 transmits a SIP session creation request message for each.

In operation S370, the second application server 220 performs service logic necessary for the SIP session creation request message for each of the second terminal 120 and the third terminal 130. Here, if necessary, the second application server 220 may modify the SIP session creation request message for each of the second terminal 120 and the third terminal 130 and transmit the modified message to the S-CSCF 150.

In step S380, the S-CSCF 150 performs the remaining initial filtering criteria after the prior processing priority for the SIP session creation request message for each of the received second terminal 120 and the third terminal 130 (iFC). ), It is determined whether the SIP session creation request message for each of the second terminal 120 and the third terminal 130 is suitable for the initial filtering criteria (iFC).

In operation S390, as a result of the determination, the S-CSCF 150 evaluates an initial filtering criterion (iFC) for a SIP session creation request message for each of the second terminal 120 and the third terminal 130, which are corresponding messages. When all are completed, the SIP session creation request message for each of the second terminal 120 and the third terminal 130, which are corresponding messages, is transmitted to the P-CSCF 140.

In step S400, the P-CSCF 140 receives the SIP session creation request message for each of the received second terminal 120 and the third terminal 130, the second terminal 120 and the third terminal 130 as the final destination. To pass).

When the second terminal 120 and the third terminal 130 accept the session generation with respect to the received SIP session creation request message, one session (the first terminal 110, the second terminal 120, and the third terminal) is received. The dialogs of the generated sessions are the same), and the IP multimedia service is provided using the same.

As described above, the method of the present invention 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.

As described above, according to the method for establishing a SIP session in the IP multimedia service according to the present invention, a plurality of SIP session creation request messages are transmitted from a calling terminal to a call session control function unit (CSCF) for one IP multimedia service. Application server can be processed to effectively manage service-related sessions.

In addition, the present invention can transmit a single SIP session creation request message from the calling terminal to the call session control function (CSCF) for a single IP multimedia service to process a plurality of application servers, the load of data transmission in the wireless end Has the effect of reducing

Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art to which the present invention pertains without departing from the spirit and scope of the present invention as set forth in the claims below. It will be understood that modifications and changes can be made.

Claims (6)

In an IP multimedia service system requiring processing of a plurality of application servers (AS) in order to receive one IP multimedia service, A plurality of application servers that perform service logic for providing the IP multimedia service; A Proxy Call Session Control Function (P-CSCF) for receiving a Session Initiation Protocol (SIP) session creation request message from the terminal; And Receive the SIP session creation request message (INVITE message) from the proxy call session control function (P-CSCF), extract the media characteristic information included in the SIP session creation request message in order of preset priority (priority) IP multimedia service including a Serving Call Session Control Function (S-CSCF) that delivers the SIP generation request message to the plurality of application servers according to an initial filter criterion (iFC). system. The method of claim 1, The SIP session creation request message (INVITE message), IP multimedia service system comprising the address information of the called terminal for the SIP session establishment. The method of claim 2, The application server extracts the address information of the called terminal and, if there are a plurality of called terminals, generates the SIP generation request message corresponding to the number of called terminals. Serving Call Session Control Function (S-CSCF) for an IP multimedia service that requires processing of a plurality of application servers (AS) in order to receive one IP multimedia service. In the Session Initiation Protocol (hereinafter referred to as "SIP") session establishment method, (a) receiving a SIP session creation request message from a calling terminal through a proxy call session control function (P-CSCF); (b) determining whether the media characteristic information extracted from the SIP session creation request message satisfies an initial filter criterion (iFC); (c) if the media characteristic information of the SIP session creation request message satisfies the initial filtering criteria (iFC), forwarding the SIP session creation request message to a corresponding application server to perform corresponding service logic; ; (d) receiving the SIP session creation request message after performing service logic corresponding to the media characteristic information from the application server; And (e) repeating steps (b) to (d) until all service logic corresponding to the media characteristic information is performed and delivering the received SIP session creation request message to a called terminal; How to establish SIP session in multimedia service. The method of claim 4, wherein Step (d) is Performing service logic corresponding to the corresponding SIP session creation request message by the application server; Extracting, by the application server, destination terminal address information included in the SIP session creation request message and generating the SIP session creation request message to correspond to the number of destination terminals when there are a plurality of destination terminals; And And receiving the SIP session creation request message corresponding to the number of the called terminals to the serving call session control function unit (S-CSCF). Serving Call Session Control Function (S-CSCF) for an IP multimedia service that requires processing of a plurality of application servers (AS) in order to receive one IP multimedia service. A recording medium readable by an electronic device on which a program comprising typed instructions for executing a Session Initiation Protocol (SIP) session establishment method is provided. (a) receiving an SIP session creation request message (INVITE message) from a calling terminal through a proxy call session control function (P-CSCF); determining whether the media characteristic information extracted from the SIP session creation request message conforms to an initial filter criterion (iFC); (c) if the media characteristic information of the SIP session creation request message satisfies the initial filtering criteria (iFC), forwarding the SIP session creation request message to a corresponding application server to perform corresponding service logic; ; (d) receiving the SIP session creation request message after performing service logic corresponding to the media characteristic information from the application server; And (e) repeating steps (b) to (d) until all service logic corresponding to the media characteristic information is performed and delivering the received SIP session creation request message to a called terminal; Recording medium that records a program for executing SIP session establishment method in multimedia service.

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