KR20080091894A - A method and a system for managing internet protocol multimedia subsystem session in a user equipment - Google Patents

A method and a system for managing internet protocol multimedia subsystem session in a user equipment Download PDF

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Publication number
KR20080091894A
KR20080091894A KR1020070034906A KR20070034906A KR20080091894A KR 20080091894 A KR20080091894 A KR 20080091894A KR 1020070034906 A KR1020070034906 A KR 1020070034906A KR 20070034906 A KR20070034906 A KR 20070034906A KR 20080091894 A KR20080091894 A KR 20080091894A
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KR
South Korea
Prior art keywords
mobile communication
communication terminal
ims session
ims
call
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Application number
KR1020070034906A
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Korean (ko)
Inventor
최종무
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삼성전자주식회사
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Priority to KR1020070034906A priority Critical patent/KR20080091894A/en
Publication of KR20080091894A publication Critical patent/KR20080091894A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/1016—IP multimedia subsystem [IMS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/30—Connection release
    • H04W76/32—Release of transport tunnels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/08—Upper layer protocols
    • H04W80/10—Upper layer protocols adapted for application session management, e.g. SIP [Session Initiation Protocol]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

A method and a system for managing An Internet protocol multimedia subsystem session in a mobile communication terminal are provided to prevent an application from being suddenly terminated when stopping the CS(Circuit Switched) call before the finish of an IMS(IP Multimedia Subsystem) session. A process for establishing an IMS session is performed at the state that the CS call between two mobile communication terminals is connected(S210). When the connection of the CS call is disconnected during the IMS service(S220), a message for requesting the end of the IMS session from the terminal connected with the network between two terminals is transmitted to a server(S230). The mobile communication terminal with the network connection state closes the IMS session(S240). The connection of the CS call is disconnected by the abnormal network disconnection by one of the two mobile terminals. The message is the BYE message with the field for showing the CS call connection state in order to disconnect the IMS session at the network stage by the server.

Description

A method and a system for managing Internet protocol multimedia subsystem session in a user equipment}

1 is a block diagram showing a schematic configuration of an IMS session management system in a mobile communication terminal according to an embodiment of the present invention.

2 is a flowchart illustrating a method of managing a session of an IMS service in a mobile communication terminal according to an embodiment of the present invention.

3 is a flowchart illustrating an IMS session establishment process according to an embodiment of the present invention.

4 is a flowchart illustrating a method of managing a session of an IMS service in a mobile communication terminal according to another embodiment of the present invention.

5 is a flowchart illustrating a method of managing a session of an IMS service in a mobile communication terminal according to another embodiment of the present invention.

The present invention relates to an Internet protocol Multimedia Subsystem (IMS) service, and in particular, when a CS (Circuit Switched) call is interrupted before an IMS session is terminated in a CSI-based IMS service, an IMS session is immediately performed. The present invention relates to an IMS session management method and system in a mobile communication terminal capable of terminating a service.

In general, CSI refers to a technology that combines an IMS service with a voice telephone using an existing circuit switched (CS) network.

The CSI-based IMS service has a structure in which an IMS session is established through packet switched (PS) while a CS call is connected between two mobile communication terminals (UE: User Equipment or MS: Mobile Staion). . That is, the user makes a call while the CS call is connected and selectively establishes an IMS session during the call, thereby enabling IMS services such as video sharing or image sharing between mobile communication terminals.

The CSI based IMS service may be serviced only when a CS call is connected. Therefore, when the CS call is disconnected from the CSI-based IMS service, the mobile communication terminal sends a message to terminate the IMS session, such as a BYE message, to the other party and terminates the IMS session by receiving a response thereto. Is performed.

However, in the conventional CSI-based IMS service, among the CSI-based IMS services between two mobile communication terminals, an abnormal situation (for example, communication loss due to entering a shadow area or power shutdown due to battery consumption) of one mobile communication terminal is performed. Accordingly, when the CS call is terminated, even if the mobile communication terminal transmits a BYE message to terminate the IMS session, the response (for example, 200 OK) is not received.

In addition, the Session Initiation Protocol (SIP) standard of the Internet Engineering Task Force (IETF) used to manage sessions in IMS does not consider heterogeneous network-like combinations such as CSI services. Made.

Therefore, the mobile communication terminal that does not receive the response repeatedly sends the BYE message until the timer for a predetermined time expires, causing unnecessary radio resources and delaying the termination of the IMS session. In addition, there is a problem that the termination of the corresponding application at the UI (User Interface) level is delayed, causing inconvenience to the user.

SUMMARY OF THE INVENTION An object of the present invention for solving the above problems is to provide a method and system for managing an IMS session in a mobile communication terminal that can immediately close an IMS session without retransmission of a BYE message when a CS call is interrupted before the end of the IMS session. It is.

Another object of the present invention is to provide a method and a system for managing an IMS session in a mobile communication terminal which can prevent unnecessary charges by immediately terminating an IMS session at a network side when a CS call is interrupted before the end of the IMS session. .

In order to achieve the above object, the method for managing an IMS session in a mobile communication terminal according to an embodiment of the present invention includes an Internet protocol multimedia subsystem (IMS) service based on CSI (Combining CS and IMS) between two mobile communication terminals. The method comprising the steps of: establishing an IMS session in a state where a CS (Circuit Switched) call is connected between the two mobile communication terminals; When the CS call is disconnected from the IMS service, transmitting a message to the server requesting the termination of the IMS session by a terminal connected to a network among the two mobile communication terminals; And closing the IMS session by the mobile communication terminal in the connected state with the network.

In order to achieve the above object, an IMS session management system in a mobile communication terminal according to an embodiment of the present invention includes: a base station for connection of a CS call; An IMS server for connecting an IMS session; It may be configured to include two mobile communication terminals for connecting the IMS session to each other via the IMS server in the state that the CS call is connected to each other through the base station. Here, if the CS call is disconnected before the IMS session is terminated, at least one of the two mobile communication terminals may generate a BYE message including a field indicating a connection state of the CS call for immediate termination of the IMS session and transmit the same to the IMS server. have.

The present invention focuses on the fact that the IMS session does not need to exist after the disconnection of the CS call anymore, so that the BYE message is sent to terminate the IMS session when the CS call is disconnected.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the same elements in the figures are represented by the same numerals wherever possible. In addition, detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

1 is a block diagram showing a schematic configuration of an IMS session management system in a mobile communication terminal according to an embodiment of the present invention.

As shown in FIG. 1, an IMS session management system 100 in a mobile communication terminal according to an embodiment of the present invention includes a first mobile communication terminal (UE1) 110 and a second mobile communication terminal. (UE2: User Equipment 2) 120, the server 130, the base station 140 may be configured. The server 130 may be an IMS server or an IMS proxy server.

The first mobile communication terminal 110 establishes an IMS session with the second mobile communication terminal 120 while the second mobile communication terminal 120 and the CS call (voice call) are connected through the base station 140. The server 130 may transmit an INVITE message.

The server 130 receiving the INVITE message transmits an INVITE message to the second mobile communication terminal 120. Upon receiving the INVITE message, the second mobile communication terminal 120 transmits a response (for example, 200 OK) to the server 130.

The server 130 transmits a response to the INVITE message sent from the second mobile communication terminal 120 to the first mobile communication terminal 110.

The first mobile communication terminal 110 receiving the response transmits an acknowledgment (ACK) signal to the second mobile communication terminal 120 through the server 130.

When the second mobile communication terminal 120 receives the ACK signal, an IMS session may be established between the first mobile communication terminal 110 and the second mobile communication terminal 120 to provide an IMS service.

When the CS call between the two mobile communication terminals 110 and 120 is released while the IMS session is established, the network connection between the first mobile communication terminal 110 and the second mobile communication terminal 120 is not released. The mobile communication terminal transmits a BYE message to the server 130 to release the network connection.

For example, when the power of the first mobile communication terminal 110 is turned off or the communication is disconnected and the network connection is released from the first mobile communication terminal 110, and thus the connection of the CS call is released, the CS call is disconnected. The second mobile communication terminal 120 generates and transmits a BYE message to the server 130 to terminate the IMS session.

The BYE message for terminating the IMS session includes a field indicating a connection state of a CS call (hereinafter referred to as a CScon (CS connection status field) field). The CS con field is a field added by the present invention, which enables the server 130 to immediately terminate the IMS session at the network end, knowing that the CS call is already lost.

The server 130 receiving the BYE message may recognize that the CS call is already disconnected by referring to the CS con field included in the BYE message, and may immediately terminate the IMS session in the network without transmitting the BYE message. At this time, the server 130 responds to the BYE message to the mobile communication terminal that has transmitted the BYE message on behalf of the terminal that has already been disconnected from the network in order to help the IMS session of the mobile communication terminal which has transmitted the BYE message. 200 OK) may be generated and transmitted.

The mobile communication terminal that transmits the BYE message may close the IMS session immediately after transmitting the BYE message only once without waiting for a response thereto. Alternatively, the server 130 may close the IMS session after receiving a response to the BYE message.

2 is a flowchart illustrating a method of managing a session of an IMS service in a mobile communication terminal according to an embodiment of the present invention. In this case, the second mobile communication terminal 120 is disconnected from the network in the IMS session connection state between the first mobile communication terminal 110 and the second mobile communication terminal 120, for example, when the CS call is disconnected. Let's explain.

As shown in FIG. 2, in step S210, the first mobile communication terminal 110 establishes an IMS session in a state in which a CS call is connected to the second mobile communication terminal 120. The IMS session establishment process is shown in FIG. 3.

3 is a flowchart illustrating a process of establishing an IMS session according to an embodiment of the present invention.

Referring to FIG. 3, in step S310, the first mobile communication terminal 110 transmits an INVITE message to the server 130, and in step S320, the server 130 receiving the INVITE message receives destination information (eg, IP). The INVITE message to the second mobile communication terminal 120.

In operation S330, the second mobile communication terminal 120 transmits a response to the INVITE message to the server 130. In operation S340, the server 130 receives the response to receive the response. 110).

In operation S350, the first mobile communication terminal 110 transmits an acknowledgment (eg, an ACK signal) to the server 130. In operation S360, the server 130 transmits the positive response to the second mobile communication terminal 120. ) To establish an IMS session.

After the establishment of the IMS session is completed, in step S220, the first mobile communication terminal 110 monitors (or determines) whether the CS call is disconnected during the IMS service, that is, before the established IMS session is terminated.

If due to disconnection of the CS call before the end of the IMS session (due to the network disconnection of the second mobile communication terminal 120), the first mobile communication terminal 110 generates a BYE message in step S230. The server 130 transmits. As described above, the BYE message further includes a CS con field (a field indicating the connection state of the CS call) for immediate termination of the IMS session according to the disconnection of the CS call.

In operation S240, the first mobile communication terminal 110 closes the IMS session. In operation S250, the server 130 receiving the BYE message refers to the CS con field included in the received BYE message. Recognize that the connection is lost, and terminate the IMS session at the network end.

4 is a flowchart illustrating a method of managing a session of an IMS service in a mobile communication terminal according to another embodiment of the present invention. In this case, for example, the first mobile communication terminal 110 and the second mobile communication terminal 120 in the IMS session connection state, the first mobile communication terminal 120 is disconnected from the CS call is disconnected, for example, Let's explain.

As shown in FIG. 4, in step S410, the first mobile communication terminal 110 establishes an IMS session in a state in which a CS call is connected to the second mobile communication terminal 120. The IMS session establishment process is the same as the steps S310 to S360 of FIG. 3.

After the establishment of the IMS session is completed, in step S420, the second mobile communication terminal 120 monitors (or determines) whether the CS call is disconnected during the IMS service, that is, before the established IMS session is terminated.

If it is recognized that the CS call is disconnected during the IMS service (as the network connection of the first mobile communication terminal 110 is released), the second mobile communication terminal 120 indicates the connection state of the CS call in step S430. A BYE message having a field added is generated and transmitted to the server 130.

The server 130 receiving the BYE message recognizes that the CS call is disconnected by referring to a field indicating the connection state of the CS call included in the BYE message, and in step S440, the second mobile communication terminal 120 performs CS. A response (eg 200OK) is generated and transmitted to the BYE message so that the session can be closed.

In step S450, the second mobile communication terminal 120 receiving the response closes the IMS session, and in step S460, the server 130 terminates the IMS session in the network.

5 is a flowchart illustrating a method of managing a session of an IMS service in a mobile communication terminal according to another embodiment of the present invention. Here, the operation of the server 130 will be described.

As shown in FIG. 5, in step S510, the server 130 establishes an IMS session in a state where a CS call is connected between the first mobile communication terminal 110 and the second mobile communication terminal 120. The IMS session establishment process is the same as the steps S310 to S360 of FIG. 3.

When the BYE message is received from the first mobile communication terminal 110 or the second mobile communication terminal 120 in step S520, the server 130 determines the connection state of the CS call in step S530. In this case, as described above, the server 130 may determine the connection state of the CS call by referring to a field indicating the connection state of the CS call included in the BYE message.

As a result of the determination, when it is determined that the CS call is disconnected, the server 130 generates a response to the BYE message and transmits the generated response to the mobile communication terminal that transmits the BYE message.

On the other hand, if the CS call is normally connected as a result of the determination, in step S550 the server 130 delivers the BYE message to the counterpart mobile communication terminal. In operation S560, the server 130 receives a response to the BYE message generated by the first mobile communication terminal 110 or the second mobile communication terminal 120 that receives the BYE message, and transmits the response to the counterpart mobile communication terminal. Pass the response.

When the transmission or transmission of the response is completed, in step S570, the server 130 terminates the IMS session at the network end.

In the above, specific preferred embodiments of the present invention have been illustrated and described. However, the present invention is not limited to the above-described embodiment, and various modifications can be made by those skilled in the art without departing from the gist of the present invention attached to the claims. will be.

As described above, the method and system for managing an IMS session in a mobile communication terminal according to the present invention, in a CSI-based IMS service, can immediately close an IMS session when a CS call is disconnected before the IMS session is terminated. This prevents the termination of the application and improves user convenience.

In addition, the present invention adds a field indicating the connection status of the CS call to the BYE message, thereby preventing the delay of terminating the IMS session at the network side. Accordingly, there is an effect of eliminating unnecessary radio resource waste and unnecessary cost caused by the termination delay.

Claims (15)

In the Internet Protocol Multimedia Subsystem (IMS) service based on CSI (Combining CS and IMS) between two mobile communication terminals, Establishing an IMS session while a CS (Circuit Switched) call is connected between the two mobile communication terminals; When the CS call is disconnected from the IMS service, transmitting a message to the server requesting the termination of the IMS session by a terminal connected to a network among the two mobile communication terminals; And closing the IMS session by the mobile communication terminal in a connection state with the network. The method of claim 1, wherein said establishing step Transmitting, by one mobile communication terminal (first mobile communication terminal), an INVITE message to another mobile communication terminal (second mobile communication terminal) through a server; Transmitting, by the second mobile communication terminal, a response to the INVITE message to the first mobile communication terminal through the server; And establishing, by the first mobile communication terminal, an IMS session by sending an affirmative response to the second mobile communication terminal through the server. The method of claim 1, wherein the connection of the CS call is IMS session management method in the mobile communication terminal, characterized in that released due to the abnormal disconnection of one of the two mobile communication terminals. The method of claim 1, wherein said message is Method for managing an IMS session in a mobile communication terminal, characterized in that the BYE message including a field indicating the connection state of the CS call for the termination of the IMS session at the network side by the server. The method of claim 4, wherein The server further comprises the step of immediately ending the IMS session in the network with reference to the field indicating the connection state of the CS call of the BYE message. The method of claim 4, wherein And the server further comprises generating a response to the BYE message and transmitting the response to the mobile communication terminal so that the mobile communication terminal in the connection state with the network can immediately close the IMS session. How to manage IMS session in terminal. In the mobile terminal running the CSI based IMS service, Monitoring whether the CS call is disconnected before the IMS session is terminated; Generating a BYE message including a field indicating a connection state of the CS call for terminating the IMS session if the CS call is disconnected before the end of the IMS session; Transmitting the generated BYE message to a server for terminating an IMS session at a network end; A method for managing an IMS session in a mobile communication terminal, comprising the step of closing the IMS session. 8. The method of claim 7, wherein closing the IMS session is IMS session management method in a mobile communication terminal, characterized in that is performed immediately after the transmission of the BYE message. 8. The method of claim 7, wherein closing the IMS session is Receiving, by the server receiving the BYE message, a response to the BYE message, and transmitting the response to the mobile communication terminal; And closing the IMS session when the mobile communication terminal receives the generated response. The method of claim 7, wherein The server receiving the BYE message further comprises the step of terminating the IMS session in the network by referring to the field indicating the connection state of the CS call included in the message IMS session management method in a mobile communication terminal . A base station for connection of a CS call; An IMS server for connecting an IMS session; Comprising two mobile communication terminals for connecting the IMS session to each other through the IMS server in the state that the CS call is connected to each other through the base station, If the CS call is disconnected prior to the end of the IMS session, at least one of the two mobile communication terminals generates a BYE message including a field indicating the connection state of the CS call for immediate termination of the IMS session, and transmits it to the IMS server. IMS session management system in a mobile communication terminal. 12. The mobile communication terminal of claim 11, wherein the mobile communication terminal that has transmitted the BYE message includes: IMS session management system in a mobile communication terminal, characterized in that immediately after the message transmission closes the IMS session. 12. The system of claim 11, wherein the IMS server is When the BYE message is received, the IMS session management system of the mobile communication terminal, characterized in that immediately terminate the IMS session in the network by referring to the field indicating the connection state of the CS call included in the message. 12. The system of claim 11, wherein the IMS server is When the BYE message is received, a response to the BYE message is generated by referring to a field indicating a connection state of a CS call included in the message and transmitted to the mobile communication terminal that has transmitted the BYE message. IMS Session Management System. 15. The mobile communication terminal of claim 14, wherein the mobile communication terminal that transmits the BYE message includes: The IMS session management system of the mobile communication terminal, characterized in that for closing the IMS session when the response is received.
KR1020070034906A 2007-04-10 2007-04-10 A method and a system for managing internet protocol multimedia subsystem session in a user equipment KR20080091894A (en)

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