KR100654187B1 - Sip user agent apparatus and method for providing session mobility using thereof - Google Patents

Abstract

The present invention relates to a SIP user agent device and a method for providing session mobility using the same.

The SIP user agent device according to the present invention performs a SIP location registration for the SIP terminal with a SIP identifier of the mobile user when a mobile user subscribed to a SIP-based mobile multimedia service moves to a SIP terminal equipped with the SIP user agent device. do. The SIP user agent device requests session information of the mobile user from a SIP server and receives session information according to the request. The session renegotiation is performed when the mobile user moves to the SIP terminal while in a SIP-based mobile multimedia session according to the session state information of the mobile user received from a SIP server. When the session renegotiation is completed, the mobile user maintains the SIP-based mobile multimedia session with the other party to the SIP terminal.

In this way, the ubiquitous computing environment can provide the ability to perform continuous SIP-based mobile multimedia services according to the user's movement.

SIP user agent, session mobility, SIP, ubiquitous computing

Description

SIP user agent device and method for providing session mobility using same {SIP USER AGENT APPARATUS AND METHOD FOR PROVIDING SESSION MOBILITY USING THEREOF}

1 is a diagram illustrating session mobility of a SIP user agent device according to an embodiment of the present invention.

2 is a block diagram of a SIP user agent device according to an embodiment of the present invention.

3 is a flowchart illustrating an operation for providing session mobility of a SIP user agent according to an embodiment of the present invention.

The present invention relates to a session initiation protocol (SIP) user agent device and a method for providing session mobility using the same. In particular, a SIP user agent device and a SIP user agent device capable of providing a continuous SIP-based mobile multimedia service according to user movement in a ubiquitous computing environment It relates to a session mobility providing method used.

Conventional mobile communication networks support terminal mobility, which provides continuous service when the physical location of the user terminal moves. In the ubiquitous service environment, continuous service is provided according to the user's movement regardless of the user's physical location or the terminal. Provides session mobility support.

When a mobile user who subscribes to a SIP-based multimedia service moves to any other SIP terminal during a session, the SIP user agent before the move maintains information of the participating session. However, the SIP user agent of any SIP terminal to which the user is newly moved does not have participating session information of the mobile user. In addition, since the other party cannot know the changed session parameter according to the movement of the user to any SIP terminal, the other session cannot receive continuous service when the user moves to any other SIP terminal.

An object of the present invention is to provide a SIP user agent device for supporting session mobility to provide a continuous SIP-based mobile multimedia service according to user movement in a ubiquitous computing environment, and a method for providing session mobility using the same.

In order to solve this problem, the present invention provides a SIP user agent device for providing session mobility according to a user's movement in conjunction with a SIP server providing a Session Initiation Protocol (SIP) based mobile multimedia service.

According to an aspect of the present invention, a SIP user agent device includes a SIP user agent core module including a standard SIP protocol stack to handle encoding, decoding, and transmission and reception of SIP messages, and to perform call control of the SIP user agent; Manage the login status according to the movement of the user, wherein the management of the login status is managed through an identification card or identification tag including information on the SIP identifier generated in response to the movement of the user; A mobile user login state management module for controlling the activation and deactivation states of the module and transferring the SIP identifier of the logged-in mobile user to the SIP user agent core module; A SIP location registration module that performs SIP location registration with the SIP identifier of a mobile user when the SIP user agent core module is activated; And a session maintenance module configured to manage session state of the mobile user, request session information of the mobile user to the SIP server, and perform session renegotiation according to session state information received from the SIP server. The activation and deactivation states of the user agent core module are controlled according to the login state information of the user transmitted from the mobile user login state management module. At this time, the session maintenance module performs session renegotiation when the mobile user logs in and the current session state is stopped and the session state information of the mobile user received from the SIP server is in session.

And the session information includes a call-ID indicating a call identification number, a local tag indicating an identification tag of the mobile user, and a remote tag indicating an identification tag of a counterpart in session with the mobile user. ID (Dialog-ID); A local Uniform Resource Identifier (URI) indicating the SIP identifier of the mobile user; A remote URI indicating the SIP identifier of the other party to which the mobile user is session; And a dialog state indicating a session state with the counterpart in which the mobile user is in session.

The session maintenance module may further include a session state management module configured to manage a session state in which the mobile user is engaged; A session information request module for requesting session information of the mobile user to join the SIP server after registering the SIP location; And a session renegotiation module for performing session renegotiation according to session state information received from the SIP server by the session information request.

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The present invention provides a method for providing session mobility according to a user's movement by interworking with a SIP server providing a SIP-based mobile multimedia service in a SIP user agent device mounted in a SIP (Session Initiation Protocol) terminal.

According to another aspect of the present invention, a method for providing session mobility using a SIP user agent includes: a) when the mobile user moves from a first SIP terminal to a second SIP terminal, If a login is detected, generating a SIP location registration message with the mobile device's SIP identifier; b) transmitting the generated SIP location registration message to the SIP server, and performing SIP location registration for the second SIP terminal with the SIP identifier of the mobile user to the SIP server; c) requesting the session information of the mobile user to the SIP server and receiving a SIP response message according to the session information request, wherein the SIP response message includes information of the session state in which the mobile user is participating; Performing session renegotiation when the mobile user moves to the second terminal while in a SIP-based mobile multimedia session according to session state information of the mobile user received from a SIP server; And d) when the session renegotiation is completed, maintaining the SIP-based mobile multimedia session with a counterpart to the second SIP terminal.

And when the mobile user moves from the first SIP terminal to the second SIP terminal in step a), the SIP user agent of the first SIP terminal logs out the mobile user from the first SIP terminal and performs a SIP user. Characterizing an agent device.

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In addition, in step c), when the SIP location registration for the second SIP terminal is completed in step b), the SIP server generates a subscription message of a SIP dialog event package to display session information in which the mobile user participates. Requesting; Ii) receiving a SIP response message according to the session information request of the mobile user from the SIP server; Iii) generating a SIP call request message based on a current session state after the mobile user moves and session state information of the mobile user received in step ii); Iii) performing session renegotiation by transmitting the generated SIP call request message to a SIP user agent of the counterpart SIP terminal; And iv) after performing the session renegotiation, receiving a SIP response message according to the SIP call request message from the SIP user agent of the counterpart SIP terminal, changing the session state of the SIP user agent of the second SIP terminal to session. It includes.

At this time, the subscription message of the SIP dialog event package in step (iii) is a message using the SIP identifier of the mobile user as a To header, and in step ii), the SIP response message participates as the SIP identifier of the mobile user. It is characterized in that the session information notification message including the session state information being in progress.

The session information notification message may be generated according to request information of a mobile user by the SIP server that processes a subscription message of the SIP dialog event package.

The SIP call request message may include the SIP identifier of the mobile user and the SIP identifier of the counterpart as a From header and a To header, respectively.

And in step iii), the SIP call request message comprises: a changed session parameter Session Description Protocol (SDP) according to the movement of the mobile user to the second SIP terminal; Call-ID indicating a call identification number; A local tag representing an identification tag of the mobile user; And a remote tag indicating an identification tag of the counterpart in session with the mobile user.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention. Like parts are designated by like reference numerals throughout the specification.

First, a SIP user agent device supporting session mobility according to user movement according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2.

1 is a block diagram illustrating an embodiment in which a SIP user agent device supporting session mobility according to a user movement according to an embodiment of the present invention is applied, and FIG. 2 is a configuration of a SIP user agent device according to an embodiment of the present invention. It is a block diagram.

As shown in FIG. 1, according to an embodiment of the present invention, even after the mobile user Bob, who is in a SIP-based mobile multimedia session with Alice, moves to any terminal 2 (110) via the internet network to terminal 1 (110). Allows you to maintain a continuous SIP-based mobile multimedia session with Alice.

Terminal 1 110 and terminal 2 120 are SIP terminals 100 that can be used by subscribers to a SIP-based mobile multimedia service network, and terminal 1 110 and terminal 2 120 have SIP user agent devices. It is mounted.

The SIP server 300 is a SIP-based call processing server that manages location registration information of mobile user Bob and controls Bob's SIP-based mobile multimedia service.

Next, as shown in Figure 2, the SIP user agent device 200 according to an embodiment of the present invention is a mobile user login state management module 210, SIP user agent core module 220, SIP location registration module 230 And session maintenance module 240. The session maintenance module 240 includes a session state management module 242, a session information request module 244, and a session renegotiation module 246.

The mobile user login state management module 210 detects any mobile user through the identification card or the identification table to check the login state of the mobile user. The mobile user login state management module 210 activates the SIP user agent core module 220 when the user logs in and deactivates the user when the user logs out. The SIP identifier of the logged-in mobile user is transferred to the SIP user agent core module 220. To pass.

SIP user agent core module 220 includes a standard SIP protocol stack in accordance with IETF RFC3261 to provide the functionality of a SIP user agent to handle the encoding, decoding and transmission and reception of SIP messages and to perform call control. The SIP user agent core module 220 executes the SIP location registration module 230, the session state management module 242, the session information request module 244, and the session renegotiation module 246. Handles the SIP protocol functions required by the session state management module 242, the session information request module 244, and the session renegotiation module 246.

SIP location registration module 230 is executed upon activation of SIP user agent core module 220. In addition, the SIP location registration module 230 performs a SIP location registration with the SIP identifier of the mobile user so that the mobile user can receive a continuous SIP-based mobile multimedia service in any SIP terminal 120 moved.

The session state management module 242 manages the state of sessions in which a SIP user agent is participating. Upon activation of the SIP user agent core module 220, the state of the session is in a suspended state, and the state of the session is maintained during the session while the session is established and receives the SIP-based mobile multimedia service.

The session information request module 244 is a subscription message of the SIP dialog event package, which is the session information of the mobile user, to obtain the session information that the mobile user participates after the registration of the SIP location of the mobile user through the SIP location registration module 230 is completed. Create and transmit to the SIP server 300. The session information of the mobile user subscribed by the session information request module 244 is SIP dialog information defined in the IETF RFC3261 and includes a dialog ID, a local Uniform Resource Identifier (URI), a remote URI, and a dialog state.

The dialog ID includes a Call-ID, a local tag, and a remote tag.

Call-ID represents a call identification number, a local tag represents an identification tag of a mobile user, and a remote tag represents an identification tag of a counterpart in session with the mobile user. The local URI represents the SIP identifier of the mobile user, and the remote URI represents the SIP identifier of the counterpart to which the mobile user is in session. In addition, the dialog state indicates a session state with a counterpart to which the mobile user is in session.

The session renegotiation module 246 is a SIP user of the mobile terminal when the state of the session state management module 242 is in a stopped state and the session state information of the mobile user who subscribes after the execution of the session information request module 244 is in session. Session renegotiation for consistent service by matching the session state of the SIP user agent of the agent and the mobile terminal before the mobile and the transfer of the session parameter SDP (Session Description Protocol) changed to the new terminal. Perform.

The session renegotiation of the session renegotiation module 246 includes the session parameter SDP of the SIP user agent of the moved SIP terminal 120 and calls the dialog ID included in the session information of the mobile user received from the SIP server 300. Generate a SIP call request message using the local tag and the remote tag, and send it to the alice. Upon receiving the SIP call request message, the alice recognizes it as a SIP Re-Invite message by the IETF SIP standard and performs a session renegotiation. If session renegotiation is successful, the mobile user can maintain a continuous SIP-based mobile multimedia session at any other SIP terminal 120 that has moved during the session.

Next, an operation of the SIP user agent device according to an embodiment of the present invention will be described in detail with reference to FIG. 3.

3 is a flowchart illustrating an operation for supporting session mobility of the SIP user agent device 200 according to an embodiment of the present invention. Here, assume that a SIP-based mobile multimedia session between Bob and Alice is successfully established.

If a SIP-based mobile multimedia session between Bob and Alice is successfully established, Bob's SIP user agent 400 and Alice's SIP user agent 700 remain in session each while receiving a SIP-based mobile multimedia service ( S300-S302). The SIP server 600 performs Bob's service control in the SIP-based mobile multimedia service network and manages Bob's session information in session with Alice (S304).

When Bob moves to any other SIP terminal 120 (S310), Bob's SIP user agent 400 in session detects Bob's logout (S312) and disables the SIP user agent core module 220. Next, return to the initial state (S314). In addition, the SIP user agent 500 of any SIP terminal 120 moved by Bob detects the login of Bob in the initial state (S306) (S316). The SIP user agent 500 that detects Bob's login activates the SIP user agent core module 220.

The SIP user agent 500 of the SIP terminal 120 moved by Bob is physically contacted by Bob's SIP identifier (bob @ office) and the moved SIP terminal 120 so that Bob can receive continuous SIP-based mobile multimedia services. A SIP location registration message (SIP REGISTER) is generated with a To header and a Contact header respectively, and the SIP location registration is performed with the SIP identifier of the mobile user. In addition, the SIP user agent 500 transmits the generated SIP location registration message to the SIP server 600 (S318), and then the SIP message received by the SIP identifier bob @ office is moved to the SIP terminal Bob has moved. 120).

After the SIP location registration, the SIP user agent 500 of Bob's SIP terminal 120 moves Bob's session information using Bob's SIP identifier (bob @ office) as a To header in order to receive Bob's session information. A subscription message (SIP SUBSCRIBE) of the SIP dialog event package is generated and transmitted to the SIP server 600 (S320). At this time, the session state of the SIP user agent 500 is in a stopped state.

When the SIP server 600 receives the subscription message of the SIP dialog event package, the SIP server 600 generates a participating session information notification message (SIP NOTIFY) using the SIP identifier bob @ office and responds to Bob's SIP user agent 500. (S322).

The SIP server 600 which processes the subscription message of the SIP dialog event package generates a session information notification message according to IETF RFC3265. At this time, the session information notification message for the subscription message of the first SIP dialog event package includes all the session information and thereafter generates a session information notification message including the changed information whenever the session information is changed.

When the SIP user agent 500 receives Bob's session information notification message, if the current session state is in a suspended state and the session state of Bob's session information received from the SIP server 600 is in session, the SIP user agent 500 receives a session information notification message from the SIP server 600. A SIP call request message (SIP INVITE) is generated to Alice corresponding to the received remote URI of Bob's session information and transmitted to Alice's user agent 700 (S324).

The SIP call request message includes a session parameter SDP of the SIP terminal 120 after moving, and a call request message including a dialog ID included in the session information received from the SIP server 600 as a call-ID, a local tag, and a remote tag. to be. When the SIP user agent 700 of Alice in session with Bob receives the SIP call request message, it recognizes it as a SIP Re-Invite message and performs session renegotiation (S326). Alice's SIP user agent 700 transmits a call response message (SIP 200 OK) for the SIP call request message transmitted from Bob's SIP user agent 500 to Bob's SIP user agent 500 (S328). .

When Bob's SIP user agent 500 receives the call response message for the SIP call request message, it enters a state in session with Alice (S330-S332). Thus, Bob can continue the session with Alice to SIP terminal 120 after the move.

As described above, the SIP user agent performs continuous SIP on any SIP terminal to which the mobile user moves during the session through the login state management and SIP location registration, session state management and session information request, and session renegotiation procedure of the mobile user. It is possible to provide session mobility capable of maintaining a base mobile multimedia session.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

As described above, according to the present invention, when a user subscribed to a SIP-based mobile multimedia service in a ubiquitous computing environment moves to any other SIP terminal, the mobile terminal can continuously receive the SIP-based mobile multimedia service by providing session mobility to the mobile user. It has the effect of making it possible.

Claims (17)

 A SIP user agent device for providing session mobility according to a user's movement by interworking with a SIP server that provides a SIP (Session Initiation Protocol) based mobile multimedia service, A SIP user agent core module including a standard SIP protocol stack to handle encoding, decoding and transmission / reception of SIP messages and to perform call control of the SIP user agent; Manage the login status according to the movement of the user, wherein the management of the login status is managed through an identification card or identification tag including information on the SIP identifier generated in response to the movement of the user; A mobile user login state management module for controlling the activation and deactivation states of the module and transferring the SIP identifier of the logged-in mobile user to the SIP user agent core module; A SIP location registration module that performs SIP location registration with the SIP identifier of a mobile user when the SIP user agent core module is activated; And A session maintenance module for managing session state of the mobile user, requesting session information of the mobile user to the SIP server, and performing session renegotiation according to session state information received from the SIP server Including; The activation and deactivation state of the SIP user agent core module is controlled according to the login state information of the user transmitted from the mobile user login state management module. delete The method of claim 1, The session maintenance module, A session state management module configured to manage a session state in which the mobile user is engaged; A session information request module for requesting session information of the mobile user to join the SIP server after registering the SIP location; And Session renegotiation module for performing session renegotiation according to session state information received from the SIP server by the session information request SIP user agent device comprising a. The method of claim 3, wherein And the session state management module manages the state of the session as a suspended state or a session state. The method of claim 3, wherein The session renegotiation module performs session renegotiation when the session state of the session state management module is in a stopped state and the session state information of the mobile user received from the SIP server by the session information request module is in session. SIP user agent device. The method of claim 3, wherein In the session information, Dialog-ID including a Call-ID indicating a call identification number, a local tag indicating the identification tag of the mobile user, and a remote tag indicating the identification tag of the other party who is in session with the mobile user. ; A local Uniform Resource Identifier (URI) indicating the SIP identifier of the mobile user; A remote URI indicating the SIP identifier of the other party to which the mobile user is session; And Dialog state indicating a session state with a counterpart to which the mobile user is in session SIP user agent device comprising a. A method for providing session mobility according to a user's movement in a SIP user agent device mounted on a SIP (Session Initiation Protocol) terminal in association with a SIP server providing a SIP-based mobile multimedia service, a) when the mobile user moves from the first SIP terminal to the second SIP terminal, if a login of the mobile user to the second SIP terminal is detected, generating a SIP location registration message with the SIP identifier of the mobile user; ; b) transmitting the generated SIP location registration message to the SIP server, and performing SIP location registration for the second SIP terminal with the SIP identifier of the mobile user to the SIP server; c) requesting the session information of the mobile user to the SIP server and receiving a SIP response message according to the session information request, wherein the SIP response message includes information of the session state in which the mobile user is participating; Performing session renegotiation when the mobile user moves to the second terminal while in a SIP-based mobile multimedia session according to session state information of the mobile user received from a SIP server; And d) when the session renegotiation is completed, maintaining the SIP-based mobile multimedia session with a counterpart to the second SIP terminal; Session mobility providing method using a SIP user agent comprising a. delete The method of claim 7, wherein And the SIP location registration message includes a SIP identifier of the mobile user and a physical contact point of a SIP terminal to which the mobile user moves, in a To header and a Contact header, respectively. The method of claim 7, wherein When the mobile user moves from the first SIP terminal to the second SIP terminal in step b), the SIP user agent of the first SIP terminal, And logging out the mobile user at the first SIP terminal and initializing a SIP user agent device. The method of claim 7, wherein Step c) is  Iii) when the SIP location registration for the second SIP terminal is completed in step b), generating a subscription message of a SIP dialog event package and requesting session information that the mobile user is participating to the SIP server; Ii) receiving a SIP response message according to the session information request of the mobile user from the SIP server; Iii) generating a SIP call request message based on a current session state after the mobile user moves and session state information of the mobile user received in step ii); Iii) performing session renegotiation by transmitting the generated SIP call request message to a SIP user agent of the counterpart SIP terminal; And Iv) after performing the session renegotiation, receiving a SIP response message according to the SIP call request message from the SIP user agent of the counterpart SIP terminal, changing the session state of the SIP user agent of the second SIP terminal to session; Session mobility providing method using a SIP user agent comprising a. The method of claim 11, In step iii), the subscription message of the SIP dialog event package is a message using a SIP identifier of the mobile user as a To header. The method of claim 11, And in step ii), the SIP response message is a session information notification message including session state information participating in the SIP identifier of the mobile user. The method of claim 13, The session information notification message is generated by the SIP server that processes the subscription message of the SIP dialog event package according to the request information of the mobile user. The method of claim 11, The SIP call request message in step iii), wherein the SIP identifier of the mobile user and the other party's SIP identifier are set as a From header and a To header, respectively. The method of claim 11, SIP call request message in step iii), A changed session parameter Session Description Protocol (SDP) as the mobile user moves to the second SIP terminal; Call-ID indicating a call identification number; A local tag representing an identification tag of the mobile user; And A remote tag indicating an identification tag of the other party in session with the mobile user Session mobility providing method using a SIP user agent comprising a. The method of claim 11, In the step iii), the session renegotiation is performed when the session state is stopped after the mobile user moves and the session state information of the mobile user received from the SIP server is in session. Session mobility providing method using.

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