KR100451006B1 - Method for controlling Call Session for IP Multimedia Service - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a method of controlling a session for an internet protocol multimedia service.

2. The technical problem to be solved by the invention

The present invention gives priority to SPIs (Service Point of Interest) included in the applied filter so that important SPIs can be applied first, and also, by filtering individual SPIs and group SPIs, they are defined according to priority and filtered. By requesting the service control of the application server as soon as each filter condition is satisfied, the method and method for controlling a session for the Internet protocol multimedia service that can shorten the service control time by reducing the filtering execution time Its purpose is to provide a computer-readable recording medium that records the program.

3. Summary of the Solution of the Invention

The present invention provides a call control method applied to an internet protocol (IP) multimedia service system, comprising: receiving a SIP request (INVITE) message from a subscriber station and using a subscriber information of the received SIP request message in a database; A first step of retrieving filter information for the subscriber; A second step of examining a filter to be applied to the subscriber by using the retrieved filter information; And sequentially selecting filters according to priorities, and filtering sequentially according to priorities for SPIs included in the selected filters until filtering is performed on all of the filters to be examined in the second step. And performing a third step of transmitting the SIP request message to an application server as long as the filter condition is satisfied.

4. Important uses of the invention

The present invention is used for the control of the session for the Internet Protocol (IP) multimedia service in the mobile communication ALL IP network.

Description

Method for controlling call session for internet protocol multimedia service

The present invention relates to a method of controlling a session for a multimedia service. More specifically, priority is given to service points of interest (SPI) included in a filter to be applied. This allows important SPIs to be applied first, and also mixes individual SPIs and group SPIs, defines them in order of priority, and performs filtering to request service control from the application server as long as each filter condition is satisfied. The present invention relates to a method for controlling a session for an internet protocol multimedia service and to a computer-readable recording medium having recorded thereon a program for realizing the method.

The conventional filtering method prioritizes filter information only at the level of the filter (Initial Filter) so that the importance is determined only at the level of the filter (Initial Filter). And at the SPI level, it was common for all SPIs to be designed to apply filters, without the concept of priorities.

Therefore, the conventional filtering method has a problem that only a part of the filtering conditions is satisfied.

The present invention has been devised to solve the above problems, and gives priority to SPIs included in a filter to be applied so that important SPIs can be applied first, and also by mixing individual SPIs and group SPIs. By defining them in order of priority and performing rapid filtering, the computer records the method of controlling the session and the program for realizing the method for internet protocol multimedia service that requires the service control to the application server as soon as each filter condition is satisfied. The purpose is to provide a readable recording medium.

1 is a diagram illustrating an embodiment of a signal flow between a serving call session control server (S-CSCF) and an application server (AS) for service control according to the present invention;

2 is an exemplary structure diagram of filter information applied to the present invention.

3 is a flowchart illustrating a method of controlling a session for an internet protocol multimedia service according to the present invention.

* Explanation of symbols on the main parts of the drawing

10: user terminal 20: serving call session control server (S-CSCF)

30, 40: application server

The present invention for achieving the above object, in a call control method applied to an Internet Protocol (IP) multimedia service system, receiving a SIP request (INVITE) message from a subscriber station, the received SIP request message of the A first step of retrieving filter information for the subscriber from a database using subscriber information; A second step of examining a filter to be applied to the subscriber by using the retrieved filter information; And sequentially filtering the filters according to the priorities after sequentially selecting the filters according to the priorities until the filtering is performed on all the filters to be examined in the second step. Performing a third step of transmitting the SIP request message to an application server as long as the filter condition is satisfied.

Meanwhile, the present invention provides a SIP request message (SIP INVITE Message: Session Initiation Protocol INVITE Message) from a subscriber station to an Internet Protocol multimedia service system having a processor for controlling a session for an Internet Protocol (IP) multimedia service. A first function of receiving and retrieving filter information for the subscriber from a database using subscriber information of the received SIP request message; A second function of examining a filter to be applied to the subscriber by using the retrieved filter information; And sequentially selecting filters according to priorities, and filtering sequentially according to priorities for SPIs included in the selected filters until filtering is performed on all of the filters to be examined in the second function. A computer readable recording medium having recorded thereon a program for realizing a third function of transmitting the SIP request message to an application server as soon as the filter condition is satisfied is performed.

The present invention provides a Serving Call Session Control Function (S-CSCF) for controlling a call session of an Internet Protocol (IP) multimedia service subscriber in a mobile communication All-IP network (hereinafter referred to as S-CSCF). And in the service control process performed in the application server (Application Server), S-CSCF relates to the application of a filter, a condition for transmitting a SIP request message to request service control to the application server (AS).

First, in order to apply the present invention, filter schema information for applying a filter is defined (see FIG. 2), priorities are applied to filters to be applied, and also to SPIs (Service Point of Interest) included in the filter. Priorities should also be defined.

One Initial Filter can have SPIs defined as individual SPIs and Groups, and between individual SPIs and Group SPIs included in one Filter is defined as an OR set, so only one of them can filter If satisfied, it forwards the SIP request message to the application server. Meanwhile, the group SPI includes a plurality of SPIs, and their priority information has the same value, and the filter condition is satisfied only when all the SPIs in the filter are satisfied. Therefore, the S-CSCF can apply the filter more flexibly by defining the priority information, the individual SPIs, and the group SPIs as appropriate filter conditions.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating an embodiment of a signal flow between a serving call session control server (S-CSCF) and an application server (AS) for service control according to the present invention.

The filter information and the application server (AS) information are already downloaded from the home subscriber server (HSS) by the S-CSCF during the user registration process, and then the S-CSCF filtering algorithm is applied. That is, in order for the filtering method according to the present invention to be applied, first, the S-CSCF must download the service profile information and the application server information about the subscriber from the home subscriber server (HSS) when the subscriber (user) registers the service. The S-CSCF classifies the received service profile information and stores the filter information in the database.When the SIP session is started and the SIP request message arrives, the S-CSCF finds the corresponding subscriber identifier in the SIP request message and keyes the found subscriber identifier. Search the database to retrieve the filter information.

As shown in the figure, a Session Initiation Protocol (SIP) session (hereinafter referred to as SIP) session, the user terminal 10 sends a SIP INVITE message (SIP INVITE Message) to the S-CSCF (20) By 101. In this example, two filters are applied. In other words, there are two filters, a first filter and a second filter, and the first filter has a higher priority than the second filter.

The S-CSCF 20 receives the SIP request message from the user terminal 10, evaluates the SPI, checks whether it meets the filter condition X of the first filter, and if it satisfies the filter condition X, S- The CSCF 20 forwards the SIP request message to the first application server AS1 30 that is the application server AS (102).

Then, the first application server (AS1) 30 performs the service control, and reflects the service control execution result in the SIP request message received from the S-CSCF (20) and transmits to the S-CSCF (20) (103). .

Meanwhile, the S-CSCF 20 examines whether the SIP request message received from the first application server AS1 30 satisfies Filter Criteria Y for the second filter. Forward the SIP request message to the user terminal or another S-CSCF according to the root header information (104), and if the filter condition (Filter Criteria) Y is met, the SIP request message is sent to the corresponding second application server (AS2) 40. Forward (105).

Then, the second application server (AS2) 40 performs the service control, and transmits the SIP request message reflecting the result of the service control to the S-CSCF (20).

If no filter exists, the SIP request message is forwarded to the user terminal or another S-CSCF according to the root header information (104).

2 is a diagram illustrating a structure of filter information applied to the present invention, and illustrates a schema structure of filter information for S-CSCF to perform filtering.

"201" is a subscriber's unique identity (Private Identity) has only one identifier (ID) per subscriber, "202" is a service profile (Service Profile) can have a maximum of 20 subscribers, the service profile This includes subscriber public identifiers, service usage rights information, filter information, and the like.

"203" represents a filter instance for applying a filter by the S-CSCF in the service profile, and may have up to 10. Here, priorities are determined for the filters to be applied.

"204" is a Trigger Point instance and may have up to one for each filter.

"205" is an SPI instance, which may have up to 25 one trigger point 204.

The SPI 205 contains the most important information for the S-CSCF to perform filtering. Priority (Priority) represents the priority of the SPI, Group Flag (Group Flag) is grouped into a group of a plurality of SPI when the filter is applied when all the SPI corresponding to the Group (Group) to apply the filter. Next SPI indicates a next SPI in a group in which the group flag is the same. That is, a group flag and a next SPI provide a method of distinguishing SPIs belonging to the same group.

On the other hand, the method (METHOD), header (HEADER), session case (SESSION CASE), SESSION DESC will be briefly described as follows.

There are six methods in the SIP request message (METHOD): INVITE, ACK, BYE, CANCEL, REGISTER, OPTION, and more. Here, INVITE is the most basic method for initiating a call between a client and a server so that a user joins a session, REGISTER transmits location information to a SIP server, and BYE sends a call to a call. Terminating the connection between the participants, the OPTION contains information about the caller's capabilities, the ACK confirms the message exchange, and the CANCEL terminates the request that was not sent.

The header includes information about the Via, the sender's address, the recipient's address, and the like, and the session case includes the call termination, call origination, etc. Information, and session information includes content information.

3 is a flowchart illustrating a method of controlling a session for an internet protocol multimedia service according to the present invention.

When the S-CSCF 20 receives the SIP request message from the user terminal 10 (300), the filter information applied to the corresponding user (subscriber) is retrieved from the database using the subscriber information of the received SIP request message ( 302, the number of filters to be applied is examined (304).

If the filter count is "0" (306), the filter application is terminated and the SIP request message is forwarded according to the route information, and if the filter filter is not "0", the filter having the highest priority among the filters to be applied is selected (308). ). This means that the filtering is performed sequentially according to the priority until the filter count becomes "0", that is, the filtering is performed on all the filters to be applied.

Processes below "310" sequentially check the filter conditions according to the priority of all SPIs included in the selected specific filter. If the filter conditions are met in the process, the SIP request message is sent to the application server immediately. After receiving the SIP request message reflecting the result of the service control execution from the application server, filtering is performed in the same manner (ie, 310 or less) for the filter having the priority after the specific filter selected above. Indicates.

Hereinafter, the "310" process will be described in detail.

If the filter with the highest priority is selected, the SPI defined in the selected filter is found and if the SPI count is "0" (310), it returns to "306", and if the SPI count is not "0", the highest priority SPI to be applied. In operation 312, it is determined whether the selected SPI is a Grouped SPI or an individual SPI.

As a result of determination, if the selected SPI is an individual SPI, filtering is performed (320). If the filter condition is satisfied (322), the SIP request message is forwarded to the application server (AS) (324) and the application server performing service control. Receives a SIP request message from 326 and returns to " 306 ", and returns to " 310 " if the filter condition is not satisfied (322).

As a result of the determination, if the selected SPI is a group SPI, filtering is performed on each SPI corresponding to the group (316), and if the entire filter condition is not satisfied (318), the process returns to "310". That is, it is determined that an OR condition is applied between individual SPIs and group SPIs belonging to one filter, and if only one is satisfied, the filter condition is determined. Among them, the group SPI is applied as an AND set to the group SPI. Filtering is performed for each SPI in the server, so that all SPIs satisfy the filter condition before sending the SIP request message to the application server. Therefore, the filter can be flexibly applied by prioritizing the filter from the important using the priority information of the SPI.

If the overall filter condition is satisfied (318), the SIP request message is forwarded to the application server (AS) (324). After the S-CSCF receives 326 the SIP request message that performs the service control in the application server AS, it returns to "306" to determine whether a filter to be applied remains.

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.

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

As described above, the present invention defines the filters to be applied by the S-CSCF, prioritizes these defined filters, and also assigns the SPI included in the filters. By defining and prioritizing this SPI, important filter information is applied first, and then the important SPI is applied from the first applied filter, and the SIP request message is transmitted to the application server as soon as the filter condition is satisfied. Because the service control is performed, that is, the filter information important to the subscriber (user) is selected first, the filter execution time can be shortened and ultimately, the service control time for the SIP request message can be shortened. It works.

Claims (4)

In a session control method applied to an Internet Protocol (IP) multimedia service system, Receiving a Session Initiation Protocol INVITE Message (SIP INVITE Message) (hereinafter referred to as SIP Request Message) from the subscriber terminal, and using the subscriber information of the received SIP request message, A first step of retrieving filter information; A second step of examining a filter to be applied to the subscriber by using the retrieved filter information; And Until the filtering is performed on all the filters to be investigated in the second step, the filters are sequentially selected according to the priority, and then Service Point of Interest (SPI) included in the selected filter (hereinafter, referred to as a filter). A third step of sequentially filtering the SPIs according to the priority and transmitting the SIP request message to an application server as long as the filter condition is satisfied. A session control method for an internet protocol multimedia service comprising a. The method of claim 1, The SPI of the third stage, A method of controlling a session for an internet protocol multimedia service, characterized by including an individual SPI and a group SPI. The method according to claim 1 or 2, The filtering process for the SPI of the third step, According to the individuality of the SPI, if the SPI is a group SPI, filtering each SPI in the group SPI and all the SPIs must satisfy the filter condition to transmit the corresponding SIP request message to the application server. How to control the session. In the Internet protocol multimedia service system having a processor for controlling a session for an Internet Protocol (IP) multimedia service, A first function of receiving a SIP INVITE message (SIP INVITE Message) from a subscriber station and retrieving filter information for the subscriber from a database using subscriber information of the received SIP request message; A second function of examining a filter to be applied to the subscriber by using the retrieved filter information; And Until filtering is performed on all the filters targeted for application in the second function, the filters are sequentially selected according to their priorities, and then SPIs included in the selected filter are included in the SPIs. A third function of performing filtering in order of priority to transmit the SIP request message to an application server as soon as the filter condition is satisfied A computer-readable recording medium having recorded thereon a program for realizing this.