KR100453325B1 - Method for Presentation of IP Multimedia Session in Mobile Multimedia Network - Google Patents

Abstract

An object of the present invention is to provide a method for providing an IP multimedia session that can efficiently use scarce radio resources by recycling a PDP session in use, shorten the time for establishing a PDP session, and provide a high quality mobile multimedia service. A first step of comparing a session request transmission rate with a transmission rate that can be provided in a set PDP session; if the PDP session providing transmission rate is not less than the IP multimedia session request transmission rate, the current available transmission rate of PDP session information is IP. A second step of changing a transmission rate excluding the transmission rate required by the multimedia service and then performing session establishment using the transmission rate requested by the IP multimedia service; if the PDP session providing transmission rate is insufficient, Provides PDP session after changing the currently available transmission rate to zero A third step of performing session establishment at a possible transmission rate, a fourth step of analyzing a newly requested IP multimedia service characteristic and classifying it into a predetermined class and searching for a PDP session satisfying the class among currently active PDP sessions; Step 5, if a satisfactory PDP session is found, step 5 of performing IP multimedia service registration and multimedia service session setup using the selected PDP session information; and if a satisfactory PDP session is not found, after establishing a new PDP session, the new PDP is set. A sixth step of performing IP multimedia service registration and multimedia service session establishment using session information, and used for a mobile multimedia system.

Description

Method for providing IP multimedia session in mobile multimedia network {Method for Presentation of IP Multimedia Session in Mobile Multimedia Network}

The present invention provides a PDP session for managing packet data transmission information in order to efficiently use radio resources and system resources deficient in a general packet radio service (GPRS) used for providing packet data services in a 3rd generation partnership project (3GPP). Packet Data Protocol Context) is a method for common use in various services. More specifically, an active PDP session provided by GPRS is commonly used in one or more mobile multimedia sessions. It is to provide a method of efficiently using wired / wireless resources.

Mobile communication service is a service that allows subscribers to continuously transmit information without loss of information while moving anywhere, anytime. Currently, voice service is mainly used, but according to the development of technology and user's desire, audio, video, There is a need to provide a mobile multimedia service including data transmission and video. In order to provide such multimedia services, high-speed data transmission is required, and resources are efficiently used by occupying only resources when needed, rather than circuit-switch, which is currently used for providing voice services in mobile communication networks. Application of packet-switch is suitable.

3GPP and 3GPP2 (3rd Generation Partnership Project 2), the international standardization organizations of mobile communication, are preparing standard standards for providing mobile multimedia services using packet-switch. In 3GPP, 3GPP R5 (Release 5) creates a standard specification for providing mobile multimedia services by modifying the second generation GPRS technology and applying it to UMTS / GPRS, the third generation mobile communication system. In particular, 3GPP R5 proposes an IP-based network structure (All-IP) that uses data transmission between all the nodes constituting the mobile communication system in the Internet, thereby easily providing interworking between the mobile communication network and the Internet network. Presenting.

1 is an exemplary configuration diagram of a 3GPP IP based mobile communication system.

General Packet Radio Service (GPRS) is a terminal (UE) constituting a mobile communication system, a control station (UTRAN) performing a wireless connection with a mobile terminal and a network, and a session control for packet data transmission (setting, It is composed of Serving GPRS Support Node (SGSN) that performs maintenance and release), and Gateway GPRS Support Node (GGSN) that performs interworking function between GPRS network and external packet data network.

GPRS is a packet-switched data service that establishes a session between these configuration nodes using the Packet Data Protocol (PDP) and transmits packet data using the GPRS Tunneling Protocol (GTP) and the Packet Data Convergence Protocol (PDCP). .

The wired / wireless resources used in GPRS are commonly used in various services according to the characteristics of packet switching, and the wired / wireless utilization capability (service capability) granted to subscribers is registered and managed in HSS subscriber information when registering subscribers. The network operator registers the service capability granted to the subscriber in the HSS subscriber information, and determines whether to allow or not based on the information registered in the HSS subscriber information when the required wire / wireless resource allocation is requested during the session establishment process for providing the service.

The packet data transmission path used in GPRS is generated during the PDP session setup process and stored in the PDP session information table of each node. The packet data generated in the UE is stored in UTRAN, SGSN, and GGSN constituting GPRS. It is sent using information (routing information). To this end, GPRS uses the PDP Context Activation process to set packet data transmission information, PDP Context Modification process to change active session information, and PDP to delete packet data transmission paths after service termination. PDP session information (PDP context) is managed through the PDP context deactivation process.

Hereinafter, a PDP session establishment (activation) process, a PDP session deletion process, and an IP multimedia service session establishment process will be described with reference to the drawings.

2 is a diagram illustrating an embodiment of a PDP session establishment (activation) process.

In the figure, the UE (UE) 200 generates necessary information for GPRS PDP session establishment, stores the relevant information in the PDP session information (Context) table, and then sends it to the SGSN 202 using a signal control message provided by UMTS. The session establishment request message is transmitted (211).

The SGSN 202 compares the service capability granted to the subscriber (ie, subscriber information transmitted from the HSS through the mobility management process) with the service capability required from the terminal, and if possible, generates a PDP session information table and receives the received information from the terminal. After storing the information, the session establishment request message is transmitted to the GGSN 203 (212). At this time, the SGSN 202 generates a GTP Tunnel Identity (GTP Tunnel Identity) for data transmission with the GGSN 203 and includes it in the request message.

The GGSN 203 generates a PDP session information table and generates and stores the transmitted information and the tunnel identifier used for data transmission with the SGSN 202. The GGSN 203 generates a tunnel identifier from the GGSN 203 to the SGSN 202. The response message is transmitted (213). The information generated by generating the PDP session information table includes SGSN 202 tunnel information and negotiated Quality of Service (QoS) information.

The SGSN 202 generates a tunnel identifier for data transmission with the control station (UTRAN) 201 and uses the message including the generated identifier and the session information received from the terminal stored in the PDP session information table. UTRAN 201 requests wireless channel establishment (214).

The SGSN 202 notifies the terminal that the session setup is completed after the radio channel setup is completed for data transmission between the terminal (UE) 200, the control station (UTRAN) 201, and the SGSN 202 (215).

PDP session information for packet data transmission between the UE (UE) 200, the control station (UTRAN) 201, the SGSN 202, and the GGSN 203 (ie, the routing information and the data to be transmitted). QoS information) is stored in the PDP session information table of the terminal (UE) 200, the control station (UTRAN) 201, the SGSN 202, and the GGSN 203.

After the GPRS PDP session is established through the process shown in FIG. 2, the terminal 200 transmits packet data using application software. ) -SGSN 202-GGSN 203 is sent to the GGSN 203 using the routing information contained in the PDP session information table configured in the IP-based network (eg, the Internet) using the IP address in the GGSN 203. Network).

3 is a diagram illustrating an embodiment of deleting a GPRS PDP session, and illustrates a GPRS PDP session deleting process of releasing an occupied wired / wireless resource after completing a packet data service.

In the figure, the terminal (UE) 200 transmits a message requesting deletion of the PDP session to the SGSN 202 (311).

SGSN 202 retrieves session related information from PDP session information table and requests session deletion to GGSN 203 (312).

The GGSN 203 notifies the SGSN 202 that the session has been deleted (313), and deletes the PDP session information table stored in the GGSN 203.

The SGSN 202 notifies the terminal (UE) 200 that the deletion of the session is completed (314) and requests the radio station to release the radio resource to the control station (UTRAN) 201 (315).

After completion of the radio channel release, the terminal (UE) 200, the control station (UTRAN) 201, and the SGSN 202 delete the stored PDP session information table, respectively. Through this process, the PDP session is deleted.

4 is a diagram illustrating an embodiment of a process for registering an IP multimedia service in a state where a PDP session is established.

The terminal (UE) 200 requests its service registration to the home network 220 of the subscriber through the PDP session path established through the PDP session establishment process for the mobile multimedia service (411). At this time, the GGSN 205 requests the service registration to the P-CSCF 301 using the IP address of the P-CSCF (Proxy-Call Server Control Function) 301 being stored through the PDP session establishment. In this case, the transmitted information is included in the IP packet and transmitted to the P-CSCF 301 through IP routing.

The P-CSCF 301 requests service registration to the Interrogating-Call Server Control Function (I-CSCF) 302 in the subscriber's home network 220 using the address information included in the transmitted message (412).

The I-CSCF 302 requests the service registration approval review to the HSS 304 that manages the subscriber information (413) and is notified of the results from the HSS 304 (414). At this time, the HSS 304 notifies the I-CSCF 302 including the Serving Call Server Control Function (S-CSCF) 303 information, which is in charge of service control of the subscriber who has requested the service registration.

I-CSCF 302 requests service registration to S-CSCF 303 using the S-CSCF 303 address sent from HSS 304 (415), and S-CSCF 303 requests HSS 304 ), Performs a subscriber authentication function through the exchange of information with the terminal (UE) (200).

After the authentication is completed, the S-CSCF 303 notifies its information to the HSS 304 (416), and receives and stores subscriber information that requested service registration from the HSS 304 (417). Here, subscriber information that requests service registration from the HSS 304 is shown in FIG.

The stored information is used by the S-CSCF 303 for service control of the subscriber during IP multimedia session establishment.

The S-CSCF 303 notifies the terminal that the subscriber service registration is completed via the P-CSCF 301 (418 to 420), and the terminal (UE) 200 activates the registered IP multimedia service information. Store in session information table.

After completing the mobile multimedia service registration through FIG. 4, the UE 200 negotiates media information and codec information used between end-to-end through an IP multimedia session establishment process. Thereafter, the mobile multimedia service is performed using the mobile multimedia application program provided by the terminal 200.

The terminal 200 may request the service release by requesting service registration by setting "expire_time" included in the service registration request message of FIG. 4 to "0".

CSCF (P-CSCF and S-CSCF) receives "expire_time = 0" information and deletes the corresponding IP multimedia service registration information.

In order to provide an IP multimedia service in a mobile communication environment, the proposed method sets a radio channel assignment and packet routing information for packet data transmission through a GPRS PDP session establishment (activation) process, and registers an IP multimedia service through an IP multimedia service registration process. After registering the IP multimedia service requested by the user, the mobile device provides a mobile IP multimedia service after negotiating media information for end-to-end. Therefore, such a method requires one GPRS PDP session establishment to provide one IP multimedia service, and five PDP session establishments are required to provide five multimedia services.

Therefore, there is a problem that can not use the wired / wireless resources efficiently.

The present invention has been proposed to solve the above problems, and provides a mobile multimedia service by recycling a PDP session that is already activated and used according to the service characteristics required by the subscriber, and effectively reduces radio resources that are insufficient in a mobile communication network. A computer readable record recording a method for providing an IP multimedia session in a mobile multimedia network capable of shortening the time required for establishing a PDP session and providing a high quality mobile multimedia service, and a program for realizing the method. The purpose is to provide a medium.

1 is an exemplary configuration diagram of a 3GPP IP based mobile communication system.

2 is a diagram illustrating an embodiment of a PDP session establishment (activation) process.

3 is a diagram illustrating an embodiment of a GPRS PDP session deletion process;

4 is a diagram illustrating an embodiment of an IP multimedia service registration process in a state where a PDP session is established.

5 is a diagram illustrating an embodiment of a subscriber data information structure stored in an HSS for a mobile multimedia service according to the present invention.

6 is a flowchart illustrating a process of examining whether a PDP session is established according to the present invention.

7 is a flowchart illustrating a process of negotiating an IP multimedia service session by reusing activated PDP session information according to the present invention.

8 is a diagram illustrating an embodiment of using three IP multimedia sessions in one PDP session according to the present invention.

* Explanation of symbols for the main parts of the drawings

200: terminal (UE) 201: control station (UTRAN)

202: Serving GPRS Node (SGSN) 203: Gateway GPRS Node (GGSN)

205: SGSN + GGSN 210: Visited Network

220: Home Network (301): P-CSCF (Proxy-CSCF)

302: Interrogating-CSCF

303: Serving-CSCF (S-CSCF) 304: Home Subscriber Server (HSS)

In accordance with an aspect of the present invention, there is provided a method for providing an IP multimedia session in a mobile multimedia network, wherein the mobile multimedia terminal that receives an IP multimedia service from a user is configured to establish a terminal and a control station through a PDP session. After setting the routing information (session information) table for packet data transmission in (UTRAN), Serving GPRS Support Node (SGSN) and Gateway GPRS Support Node (GGSN), register the requested IP multimedia service, and in the IP multimedia session The first step of comparing the required transmission rate with the transmission rate that can be provided in the set PDP session, and as a result of the comparison of the first step, the transmission rate provided by the PDP session is not insufficient compared to the transmission rate required in the IP multimedia session. If not, the currently available data rate of PDP session information is set to the data rate required by the IP multimedia service. After changing to one transmission rate, the second step of performing session establishment using the transmission rate requested by the IP multimedia service, and as a result of the comparison of the first step, if the transmission rate provided by the PDP session is insufficient, the PDP session After changing the currently available transmission rate of information to zero, the third step of performing session establishment at the transmission rate that can be provided in the PDP session, and after performing the session establishment, the terminal requesting a new IP multimedia service After analyzing the required service characteristics and classifying them into a predetermined class, a fourth step of searching for a PDP session that satisfies the required level in the IP multimedia service among the currently active PDP sessions; A fifth step of registering an IP multimedia service using the selected PDP session information and performing a multimedia service session establishment process when a PDP session is found A sixth step of establishing a new PDP session and registering an IP multimedia service using the set new PDP session information and performing a multimedia service session establishment process if a new PDP session is not found. Characterized in that it comprises a step.

Meanwhile, the present invention relates to a mobile multimedia system having a high-capacity processor for providing an IP multimedia session, wherein a mobile multimedia terminal that has received an IP multimedia service from a user through a PDP (Packet Data Protocol) session. After setting the routing information (session information) table for packet data transmission to the Serving GPRS Support Node (SGSN) and the Gateway GPRS Support Node (GGSN), register the requested IP multimedia service and transmit the required IP multimedia session. A first function of comparing the speed with a transmission rate that can be provided in the PDP session; As a result of the comparison of the first function, if the transmission rate provided by the PDP session is not insufficient compared with the transmission rate required in the IP multimedia session, the transmission rate required by the IP multimedia service is the currently available transmission rate of the PDP session information. A second function of changing a transmission rate except for performing session establishment using a transmission rate requested by an IP multimedia service; As a result of the comparison of the first function, if the transmission rate provided by the PDP session is insufficient, change the currently available transmission rate of the PDP session information to zero, and then set the session at the transmission rate that can be provided by the PDP session. A third function to perform; After the session setup, the terminal requesting the new IP multimedia service analyzes the required service characteristics and classifies it into a predetermined class, and then, among the currently active PDP sessions, a PDP session satisfying the class required by the IP multimedia service. A fourth function of searching for; A fifth function of registering an IP multimedia service using the selected PDP session information and performing a multimedia service session establishment process when the PDP session is found to be satisfied as a result of the search of the fourth function; And a sixth function that registers an IP multimedia service using the set new PDP session information and performs a multimedia service session establishment process after establishing a new PDP session if a PDP session is not found as a result of the search of the fourth function. A computer readable recording medium having recorded thereon a program for realizing the present invention is provided.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

5 is a diagram illustrating an embodiment of a subscriber data information structure stored in an HSS for a mobile multimedia service according to the present invention.

This information is the subscriber information stored in the HSS when the subscriber applies for the mobile multimedia service subscription to the mobile service provider, so that the multimedia service information 510 can be applied for as many as the required multimedia services. Stored.

In the drawing, "500" is subscriber information provided with a mobile multimedia service, and a subscriber identification number (IMSI (International Mobile Subscriber Identity) (501) used for providing a packet data service to a subscriber, and a mobile multimedia service subscriber identification number (502). And index information 503 for the multimedia service information registered by the subscriber.

In addition, "510" is mobile multimedia service information registered to a subscriber, subscriber index information 511 connecting a subscriber identification number and service information provided to the subscriber, and the subscriber transmits data with a subscriber connected to an external Internet network. Public subscriber identification number (512), whether to register the current IP multimedia service (513), Serving-CSCF information (514) to control the subscriber's mobile multimedia service, the transmission rate (515) assigned for the service, Consists of granted service capability 516.

The subscriber information 500 provided with the mobile multimedia service and the mobile multimedia service information 510 registered to the subscriber are transmitted and stored from the HSS to the S-CSCF during the mobile multimedia service registration process.

6 is a flowchart illustrating a process of examining whether a PDP session is established according to the present invention, and illustrates a process of a terminal classifying a service grade and examining whether a new PDP session is established by a user who is requested to provide a service.

The terminal analyzes the service characteristics (QoS information) requested from the user (601), classifies them as one of the QoS service class (Conversational class, Streaming class, Interactive class, Background) defined in UMTS (602), and all currently active PDPs. Among the sessions, it is checked whether there is a PDP session that satisfies the required service class and the transmission rate that can be provided for the new service is greater than zero (603, 604).

If a satisfactory PDP session is found, the IP multimedia service registration is started using this PDP session (605). If a satisfactory PDP session cannot be found and another PDP session exists, it is activated and then allocated (607) and activated. In step 603, the correspondence between the PDP session service class and the requested service type is checked.

If a PDP session that satisfies the required service level cannot be found from all activated PDP sessions, IP multimedia service registration is started after establishing a new PDP session (608). At this time, the success of the PDP session establishment is determined according to the GPRS service capability granted to the subscriber.

In FIG. 6, the terminal periodically downloads and stores information classified into a QoS class (Conversational class, Streaming class, Interactive class, Background) provided by UMTS for a service from the network. The required service may be classified into a QoS service class defined in UMTS without performing the service characteristic analysis process performed in the service characteristic analysis process 601.

GPRS stores the routing information and the negotiated QoS information in the PDP session information of the terminal, SGSN, and GGSN after completing the PDP session setup as shown in FIG. 2, so that the terminal can retrieve the service level from the QoS information included in the stored PDP session information. have.

7 is a flowchart illustrating a process of performing IP multimedia service session negotiation by reusing activated PDP session information according to the present invention.

After registering the IP multimedia service using the PDP session activated through FIG. 6, the terminal receives the multimedia service session establishment (negotiation) request and then retrieves the corresponding PDP session information (701), and uses the current stored in the corresponding PDP session information. A possible transmission rate (BW) is compared with the transmission rate (BW) required for the multimedia service (702, 703).

If the transmission speed that can be provided in the activated PDP session information is larger than the transmission speed required by the multimedia service, change the currently available transmission speed of the PDP session information to the transmission speed except the transmission speed required by the IP multimedia service. 704, a service session establishment (negotiation) is started using the requested service transmission rate (705).

If the available transmission rate in the activated PDP service information is smaller than the requested transmission rate, the user is requested to approve whether to start the service session establishment (Negotiation) with the currently available transmission rate (CurrPDP_bw) (706).

If the user approves to negotiate the service at the currently available baud rate, it assigns zeros to the baud rate information available in the PDP session (707) and then establishes a service session using the baud rate available in the PDP session (negotiation). (708).

If the user refuses to negotiate service at the currently available transmission rate, the terminal deletes the already registered IP multimedia service registration (709). In this case, the user may cancel the registration of other IP multimedia services registered in the activated PDP session to receive the high quality IP multimedia service and register and use a new service.

In the service registration cancellation, the service registration cancellation request may be requested by setting "expire_time" included in the service registration request message 411 to zero in FIG. 4.

After canceling the service registration, the transmission rate allocated to this service is additionally stored in the available transmission rate information of the corresponding PDP session information table to provide an opportunity to occupy and use it in other IP multimedia services.

8 is a diagram illustrating an embodiment of using three IP multimedia sessions in one PDP session according to the present invention.

In the drawing, the GPRS system 800 includes a terminal 801, an SGSN 802, and a GGSN 803, and may be connected to external ISPs 806, 807, and 808 to receive a service.

In FIG. 8, the PDP session X established through the process of FIG. 2 provides a UMTS service class, "Interactive class". In addition, by using the configured PDP session X information, three services through the service negotiation after registering three services (that is, web browsing, database retrieval, server access) requiring the "Interactive class" service level through the process of FIGS. The IP multimedia service session with ISPs 806 to 808 is established.

In this state, the user simultaneously executes "web browsing", "database retrieval", and "server access" with external ISPs through the application of the mobile multimedia terminal 801 using the currently active PDP session (X) information. It is possible.

In the present invention, when using multiple IP multimedia sessions using one PDP session setup, if an error occurs in the radio resources occupied by the change of wireless environment among multimedia services, the transmission rate is zero through GPRS session control function. Is changed to). At this time, the multimedia service is stopped, and if the transmission speed of the PDP session is changed to zero or more through the reactivation process of the PDP session, the multimedia service can continue. At this time, if the transmission speed of the PDP session does not change to zero or more for a specific time, the terminal cancels the registration of the multimedia session in service.

In addition, as multiple IP multimedia sessions are used by using one PDP session setting, a user may delete a PDP session after canceling registration of all IP multimedia services currently used in the corresponding PDP session to delete an active PDP session. have. The terminal may find an IP multimedia session managed by the PDP session using the IP multimedia service information stored in the PDP session information table.

In addition, since the packet data is transmitted using the PDP session information in the IP multimedia service in the GPRS network, GPRS handover caused by the movement of the IP multimedia terminal in a state where several IP multimedia service sessions are set for one PDP session. Since the PDP session is reestablished through the handover process provided by GPRS, the related IP multimedia session is not affected.

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 not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the art without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

As described above, in the present invention, a PDP session managing packet transmission information (for example, routing information and QoS) is commonly used in one or more IP multimedia service sessions for packet data transmission in an IP-based GPRS mobile communication environment. It is effective to use scarce wired / wireless resources.

In addition, the present invention has the effect of using a variety of IP multimedia services using one PDP session information according to the service characteristics required by the terminal. That is, by using one PDP session, one or more services requiring the same UMTS service class can be used to recycle radio resources that are insufficient in the mobile communication network, reduce the time required for establishing a PDP session, and provide high quality mobile multimedia services. There is an effect that can be provided.

Claims (10)

A method for providing an IP multimedia session in a mobile multimedia network, A mobile multimedia terminal requesting an IP multimedia service from a user transmits packet data to a terminal, a control station (UTRAN), a serving GPRS support node (SGSN), and a gateway GPRS support node (GGSN) through a packet data protocol (PDP) session establishment. A first step of setting a routing information (session information) table, registering a requested IP multimedia service, and comparing a required transmission rate in an IP multimedia session with a transmission rate that can be provided in a set PDP session; As a result of the comparison in the first step, if the transmission rate provided by the PDP session is not insufficient compared to the transmission rate required in the IP multimedia session, the transmission rate required by the IP multimedia service is the currently available transmission rate of the PDP session information. A second step of changing a transmission rate except for performing session establishment using a transmission rate requested by the IP multimedia service; As a result of the comparison in the first step, if the transmission rate provided by the PDP session is insufficient, the current transmission rate of the PDP session information is changed to zero, and then the session is set to the transmission rate that can be provided by the PDP session. Performing a third step; After the session setup, the terminal requesting the new IP multimedia service analyzes the required service characteristics and classifies it into a predetermined class, and then, among the currently active PDP sessions, a PDP session satisfying the class required by the IP multimedia service. Searching for a fourth step; A fifth step of registering an IP multimedia service using the selected PDP session information and performing a multimedia service session establishment process when the PDP session is found to be satisfied as a result of the search of the fourth step; And If the PDP session is not found as a result of the search in step 4, after establishing a new PDP session, the step 6 registers an IP multimedia service using the set new PDP session information and performs a multimedia service session establishment process. IP multimedia session providing method comprising a. The method of claim 1, The fifth step, IP multimedia service that stores the Serving-CSCF (Serving-Call Server Control Function) assignment and the Serving-CSCF information in the Home Subscriber Server (HSS), which controls and authenticates the subscriber, the multimedia service using the selected PDP session information. A seventh step of performing a registration and multimedia service session establishment process; And If the data transmission rate required for the multimedia service is smaller than the currently available data transmission rate of the PDP session selected in the fourth step while performing the multimedia service session setup in the seventh step, the currently available transmission of the PDP session information. Eighth step of changing the speed to a transmission speed excluding the transmission speed required by the IP multimedia service, establishing a session using the transmission speed requested by the IP multimedia service, and then performing the IP multimedia service. IP multimedia session providing method comprising a. The method of claim 1, The sixth step, A ninth step of establishing a new PDP session through a general packet radio service (GPRS) session establishment process satisfying the required grade; The IP multimedia service registration process and the multimedia service session establishment process for performing authentication of subscribers, Serving-CSCF allocation for controlling a multimedia service, and storing Serving-CSCF information in an HSS using the set new PDP session information are performed. Step 10; And While performing the multimedia service session setup in the tenth step, if the data transfer rate required by the multimedia service is smaller than the currently available data transfer rate of the set new PDP session, the currently available transfer rate of the PDP session information is set to IP multimedia. Step 11 after changing the transmission rate except for the transmission rate required by the service, establishing a session using the transmission rate requested by the IP multimedia service, and performing an IP multimedia service IP multimedia session providing method comprising a. The method of claim 1, The mobile multimedia network, Mobile IP multimedia terminal, base station and control station (UTRAN), Serving GPRS Support Node (SGSN) that performs General Packet Radio Service (GPRS) authentication and control functions, and GGSN (GGSN) that provides interworking with GPRS network and external packet data network. Gateway GPRS Support Node, P-CSCF (Proxy-CSCF), I-CSCF (Interrogating-CSCF), S-CSCF (Serving-CSCF) and HSS (Home Subscriber) that manages subscriber information. Server-based IP multimedia session providing method characterized in that the IP-based 3GPP mobile multimedia network. The method of claim 1, The predetermined grade of the fourth step is, Universal Mobile Telecommunications Systems (UMTS) Quality of Service (QoS) class of "Conversational class", "Streaming class", "Interactive class", "Background", characterized in that the method for providing an IP multimedia session. The method of claim 1, The terminal receiving the IP multimedia service of the fourth step, Periodically download and store UMTS QoS classification table information including mobile multimedia services provided by mobile operators from the network, and find UMTS QoS level corresponding to the service in the stored classification table without analyzing required service characteristics. And providing the IP multimedia service session establishment process. The method of claim 1, The service session establishment process, If the data transmission rate required by the multimedia service is larger than the transmission rate currently available in the PDP session, the service session setup (negotiation) is performed at the transmission rate available in the PDP session. A twelfth step of requesting approval; If the user approves in the twelfth step, the terminal changes the currently available transmission rate to zero in the PDP session information and then performs a service session establishment using the available transmission rate in the corresponding PDP session establishment. step; And If the user does not approve in step 12, the terminal cancels the registration of the registered IP multimedia service and then establishes a new PDP session to provide the IP multimedia service. IP multimedia session providing method comprising a. The method according to any one of claims 1 to 7, The IP multimedia session providing process, When one or more IP multimedia service sessions are set in one activated PDP session, if an error occurs in the wireless environment and the activated PDP session is canceled, the terminal waits for reactivation of the PDP session for a predetermined time, If the corresponding PDP session is not reactivated, cancels registration of all related multimedia services using IP multimedia service information stored in the PDP session information table and then deletes the PDP session. The method of claim 8, The IP multimedia session providing process, When one or more IP multimedia service sessions are established in one active PDP session, if the handover occurs due to the movement of the IP multimedia terminal, the PDP session is reset through the GPRS handover process, but the related IP multimedia sessions are not affected. IP multimedia session providing method, characterized in that the service continues. In a mobile multimedia system having a large processor for providing an IP multimedia session, A mobile multimedia terminal requesting IP multimedia service from a user for packet data transmission to a terminal, a control station (UTRAN), a Serving GPRS Support Node (SGSN), and a Gateway GPRS Support Node (GGSN) through a Packet Data Protocol (PDP) session. A first function of setting a routing information (session information) table and registering a requested IP multimedia service and comparing a transmission rate required in the IP multimedia session with a transmission rate that can be provided in the PDP session; As a result of the comparison of the first function, if the transmission rate provided by the PDP session is not insufficient compared with the transmission rate required in the IP multimedia session, the transmission rate required by the IP multimedia service is the currently available transmission rate of the PDP session information. A second function of changing a transmission rate except for performing session establishment using a transmission rate requested by an IP multimedia service; As a result of the comparison of the first function, if the transmission rate provided by the PDP session is insufficient, change the currently available transmission rate of the PDP session information to zero, and then set the session at the transmission rate that can be provided by the PDP session. A third function to perform; After the session setup, the terminal requesting the new IP multimedia service analyzes the required service characteristics and classifies it into a predetermined class, and then, among the currently active PDP sessions, a PDP session satisfying the class required by the IP multimedia service. A fourth function of searching for; A fifth function of registering an IP multimedia service using the selected PDP session information and performing a multimedia service session establishment process when the PDP session is found to be satisfied as a result of the search of the fourth function; And A sixth function of establishing a new PDP session and registering an IP multimedia service using the set new PDP session information and performing a multimedia service session establishment process if a PDP session is not found as a result of the search of the fourth function; A computer-readable recording medium having recorded thereon a program for realizing this.