KR101128529B1 - Apparatus and Method for controlling of session mobility, Network controlling system - Google Patents

Abstract

A method for controlling session mobility in an IP multimedia subsystem, the method comprising: receiving a session movement request between terminals; And a call initiation request to a terminal to establish a new session based on the received session move request, and when a response is received from the terminal to establish a new session, transmits a call initiation re-request to a session establishment counterpart terminal, And performing session mobility control between terminals in association with each other. The method of controlling session mobility on a network, comprising changing to another terminal while a user is receiving a call and a multimedia service using one terminal, is performed. It is possible to continuously receive calls and multimedia services that are being used, thereby providing convenience.

Description

Apparatus and Method for controlling of session mobility, Network controlling system

The present invention relates to IP Multimedia Subsystem (IMS), and more particularly to a method for controlling session mobility in IP Multimedia Subsystem.

The present invention is derived from a study conducted as part of the IT growth engine technology development project of the Ministry of Knowledge Economy and the Ministry of Information and Communication Research. [Task Management Number: 2008-S-007-01, Title: Development of Network Knowledge-based Personalization Service Technology]

IP Multimedia Subsystem (IMS) of the 3rd Generation Partnership Project (3GPP) is a system developed so that communication providers can provide various multimedia services to users through SIP-based session control based on IP networks. This is being accepted as the standard of the basic control structure of the next generation wired and wireless converged network. IMS works with network transport layer for easy delivery of IP multimedia services, and makes it easy to develop various application services. Especially, third-party service companies, not telecommunication service providers, also use open access structures to connect with IMS. It enables to develop interlocked services.

In addition, the IMS service platform is designed for the purpose of controlling sessions between peers. IMS only deals with the signaling and control of the session and is not involved in the actual data transfer. As a call processing protocol between peers in IMS, Session Initiation Protocol (SIP), which is a standardization protocol in the Internet Engineering Task Force (IETF), is used.

In the IMS-based mobile communication network, while a user is receiving multimedia services including a call through a terminal, a technology regarding terminal mobility capable of continuously providing a service without interruption even when moving is provided. In detail, as the wireless access technology is diversified, technologies that can simultaneously use a plurality of mobile access methods in one terminal have been developed. In addition, when a user has a plurality of terminals, a research is being conducted on a technology for continuously receiving a service connection by switching to another terminal while using a multimedia service including a call from one terminal.

SUMMARY OF THE INVENTION The present invention is derived from the above technical background, and in the IMS-based mobile communication network, a session mobility control method for allowing a user to continuously receive the same service without changing the terminal while receiving a call and a multimedia service, and It is an object to provide a device.

This technical problem comprises the steps of receiving a session transfer request between terminals; And a call initiation request to a terminal to establish a new session based on the received session move request, and when a response is received from the terminal to establish a new session, transmits a call initiation re-request to a session establishment counterpart terminal, And performing session mobility control between terminals in association with each other.

In this case, the performing of the control may include acquiring multimedia session information of the terminal to newly set up a session in response to a call initiation request, and the call initiation request may include multimedia session information of the terminal to newly set up a session. It is done. The performing of the control may include obtaining multimedia session information corresponding to the multimedia session information of the terminal to be newly set up from the session establishment counterpart terminal in response to the call initiation re-request, and The multimedia session information is transmitted to the newly established session.

Also, the mobility control method may include: receiving a call initiation request from an originating terminal before receiving a session movement request; Adding and editing information for registering session movement control to the call initiation request; And forwarding the edited call initiation request to a called terminal.

On the other hand, the technical problem is a communication unit for performing communication with the network device; And when a session move request is received through the communication unit, based on the received session move request, transmit a call start request to a terminal to newly set up a session, and transmit a call start re-request to a session establishment counterpart terminal to control a call service. It is also achieved by the apparatus for controlling session mobility in a network, including a control unit for performing mobility control for a session formed between terminals in association with a function.

The control unit transmits a call release request to a terminal having a session previously set, and the control unit receives a call initiation request from an originating terminal, adds and edits information for registering session movement control to the received call initiation request. Then, the edited call initiation request is delivered to the called terminal.

In addition, the technical problem is a call service control device for performing a call service control between a plurality of terminals; A session movement determining apparatus for determining whether or not a preset session mobility is present; And a session mobility control device that controls session mobility in association with the call service control device when a session movement request is received from the session movement determining device. Also achieved by a network control system comprising a.

According to the present invention, while a user is receiving a call and a multimedia service using one terminal, the user can continuously receive a call and a multimedia service that is in progress by switching to another terminal, thereby providing convenience.

The foregoing and further aspects of the present invention will become more apparent through the preferred embodiments described with reference to the accompanying drawings. Hereinafter, the present invention will be described in detail so that those skilled in the art can easily understand and reproduce the present invention through these embodiments.

1 is an exemplary diagram of a network control system according to an embodiment of the present invention.

As shown, the network control system 10 according to the present invention includes a session movement determining apparatus 100, a session mobility controlling apparatus 200, a call service controlling apparatus 300, and a subscriber information DB 400.

The session movement determining apparatus 100 is a network device. In the present embodiment, the session movement determining apparatus 100 may determine whether the movement of a session already established for call and multimedia services is necessary based on the context information received from the terminal or by monitoring the communication state. In addition, in one embodiment, the session movement determining apparatus 100 may be implemented as a triggering server. In this case, when it is determined that the session movement is necessary, the session movement determining apparatus 100 transmits a triggering signal including session information and terminal information to the session mobility control apparatus 200. However, the present invention is not limited thereto and may be implemented in obvious modifications.

The session mobility control apparatus 200 controls session mobility in association with a call service control apparatus 300 to be described later according to a session movement request received from the session movement determining apparatus 100. In the present embodiment, the session mobility control device 200 transmits a call initiation request to the terminal to establish a new session according to the session movement request. When a response to the call initiation request is received from the terminal for newly establishing a session, the call initiation re-request is transmitted to the session establishment counterpart terminal. Thereafter, when the session mobility control apparatus 200 receives a response to the call initiation re-request from the counterpart terminal, the session mobility control apparatus 200 transmits a call release request to the terminal where the session was previously set.

The call service control device 300 may be implemented with CSCF. CSCF handles subscriber registration, authentication, billing, service-specific triggering and routing to the application server, caller location inquiry, compression and decompression of SIP message, and performs user session setup, adjustment, and management. And it is linked with the subscriber information DB (400) that stores subscriber profile information, authentication and location related data. The subscriber information DB 400 may be a home subscriber server (HSS). CSCF is an infrastructure system that performs basic functions for SIP-based multimedia session control. In more detail, the call service control device 300 is a proxy call session control function P-CSCF (Proxy-CSCF) and serving call session control function in detail. Serving-CSCF (S-CSCF), interrogating call session control function I-CSCF (Interrogating-CSCF).

Here, the outgoing call controller 310 may be implemented with P-CSCF and S-CSCF to which the calling terminal is connected, and the called call controller may be implemented as P-CSCF and S-CSCF to which the called terminal is connected. For convenience of description, each of the outgoing call control unit 310 and the incoming call control unit 320 is divided, but may be technically the same configuration, it may be a concept that is divided into functional differences according to the connection between the called terminal and the calling terminal. .

Referring to FIG. 1, an example of session mobility between terminals is described. User A carries at least one or more originating terminals 20a and 20b. User A may attempt to connect to the caller terminal 30a of another user B by using the calling terminal 20a. At this time, the call service control apparatus 300 to which the calling terminal 20a is connected performs the calling call controller 310 function. In addition, the call service control device 300 to which the terminating terminal 30a is connected serves as the terminating call control unit 320.

The session mobility controller 200 may move a session from the originating terminal 20a to another originating terminal 20b when the originating terminal is changed when the session movement request from the session movement determining apparatus 100 is received. . That is, in this case, the session mobility control apparatus 200 moves the session so that a session is established between the calling terminal 20a and the called terminal 30a so that a session is established between the other calling terminal 20b and the called terminal 30a. Perform the process.

In addition, when the called terminal is changed, the session can be moved from the called terminal 30a to another called terminal 30b. In this case, the session mobility control apparatus 200 performs session movement processing so that a session is established between the calling terminal 20a and another called terminal 30b that the session has been established between the calling terminal 20a and the called terminal 30a. To perform.

2 is a block diagram of an apparatus for controlling session mobility according to an embodiment of the present invention. As shown, the session mobility control apparatus according to an embodiment includes a communication unit 210 and the control unit 220. In the present embodiment, the session mobility control device 200 may be implemented as an application server in the IMS network. However, the present invention is not limited thereto.

The communication unit 210 communicates with a network device. When the session movement request is received through the communication unit 210, the controller 220 performs mobility control on a session formed between terminals based on the received session movement request. In the present embodiment, the controller 220 may transmit a message to the terminals possessed by the user in association with the call service control apparatus 300 and receive the response.

In detail, the controller 220 includes a call initiation request unit 222, a call initiation re-request unit 224, a call release request unit 226, and an editing unit 228. When the session initiation request is received through the communication unit 210, the call initiation requester 222 transmits a call initiation request to a terminal to establish a new session based on the received session movement request information. The call initiation re-request unit 224 transmits the call initiation re-request to the session establishment counterpart terminal according to the session movement request received through the communication unit 210. The call release request unit 226 transmits a call release request to a terminal that has previously established a session with the counterpart terminal. The editing unit 228 receives a call initiation request from the originating terminal, and edits by adding information for registering session movement control to the received call initiation request. Then, the edited call initiation request is delivered to the called terminal.

Hereinafter, a method of controlling session mobility according to an embodiment of the present invention will be described in detail with reference to FIGS. 3 to 6.

3 and 4 are flowcharts of a method for controlling session mobility when an originating terminal is changed according to an embodiment of the present invention.

First, the originating terminal 20a possessed by the calling user first transmits a call initiation request to the originating call controller 310 in order to make a call connection with the called terminal 30a (S301). Then, the call signal control unit transmits a call initiation request to the session mobility control apparatus 200 in order to control session movement between terminals later (S302). The session mobility control apparatus 200 modifies and edits the call initiation request so that the session mobility control device can be included in a signaling path that is performed later. Accordingly, afterwards, the outgoing call controller 310 may deliver all signaling messages related to the corresponding session to the session mobility controller 200. The session mobility control apparatus 200 transmits the edited call initiation request to the outgoing call controller 310 (S303).

Thereafter, the outgoing call controller 310 grasps information of the called terminal 30a included in the call initiation request. The originating call control unit 310 transmits a call initiation request to the terminating terminal 30a through the call service control device to which the terminating terminal 30a belongs, that is, the terminating call control unit 320 (S304), and receives the response. (S305). The outgoing call controller 310 transmits the signal from the called terminal 30a to the calling terminal 20a through a process of transmitting to the mobility control device (S308) since the response from the called terminal 30a is a signaling message made in a preset session (S309).

The originating terminal 20a creates an acknowledgment message for the received response message, which is transmitted to the called terminal via the outgoing call controller 310, the session mobility controller 200, and the incoming call controller 320. It is transmitted (S310, S312, S314, S315). Accordingly, a call session is connected between the calling terminal 20a and the called terminal 30a, and the call is available (S320).

4 is a method of mobility control after session establishment. After the session is established, the session movement determining apparatus 100 needs to change a session previously established with the originating terminal 20a to be connected with another originating terminal 20b, and then moves to the session mobility control apparatus 200. The session move request is transmitted (S325). Then, the session mobility control apparatus 200 transmits a call initiation request to the originating terminal 20b which needs to establish a new session through the originating call controller 310 which processes the session connection to the originating terminal 20b (S330). The response is received (S333).

At this time, the response from the new originating terminal 20b includes session information on the originating terminal 20b itself. The session information may be at least one of an IP address, supportable codec, media type, and port information.

Thereafter, the session mobility control apparatus 200 receives the call initiation request message including the multimedia session information received from the new originating terminal 20b via the originating call control unit 310 and the terminating call control unit 320. Transfer to 30a (S335). In addition, the terminating terminal 30a transmits a response to the originating call control unit 310 through the terminating call control unit 320, and the originating call control unit 310 transmits the response from the terminating terminal 30a to the session mobility controller 200. Transfer to) (S345). In this case, the response from the called terminal 30a includes session information of the called terminal 30a corresponding to the session information of the calling terminal 20b in which a new session is established.

In addition, the session mobility controller 200 transmits a confirmation message for the response message to the called terminal (S350). In addition, a confirmation message is also transmitted to the calling terminal 20b in which a new session is established. At this time, the acknowledgment message includes multimedia session information obtained from the called terminal 30a. Accordingly, the call session is connected between the new calling terminal 20b and the called terminal 30a, and the call is available (S360). Thereafter, the session mobility control apparatus 200 transmits a call release request to the originating terminal 20a, which was previously connected to the session, through the originating call control unit 310 (S370) and receives the response (S375).

5 and 6 are flowcharts of a method for controlling session mobility when a terminating terminal is changed according to an embodiment of the present invention.

First, the calling terminal 20a possessed by the calling user transmits a call initiation request to the calling call controller 310 for call connection to the called terminal 30b. Then, the outgoing call controller 310 transmits the call initiation request to the incoming call controller 320 (S400).

After that, the incoming call control unit 320 later transmits a call initiation request to the session mobility controller 200 to control session movement between calling terminals (S403). Then, the session mobility control apparatus 200 modifies the call initiation request so that it can be included in a signaling path which is performed later, and transmits it to the incoming call controller 320. At this time, by modifying the information of the call initiation request in the session mobility control device 200, the incoming call control unit 320 will then send all signaling messages related to the session to the session mobility control device 200. In addition, the incoming call controller 320 transmits the modified call initiation request obtained from the session mobility controller 200 to the called terminal 30a (S405).

Thereafter, the called terminal 30a transmits a response to the call initiation request to the calling terminal 20a via the called call controller 320, the session mobility controller 200, and the call signal controller 220 (S407). ). Then, the originating terminal 20a receiving the response message generates and sends a confirmation message. At this time, the confirmation message is transmitted to the called terminal 30a through the outgoing call controller 310, the called call controller 320, the session mobility controller 200, and the called call controller 320 again (S410). By this signaling procedure, a call session is connected between the calling terminal 20a and the called terminal 30a, and a call state is established (S420).

6 is a method of mobility control after session establishment. After the session is established between the calling terminal 20a and the called terminal 30a, the session movement determining apparatus 100 needs to change the session previously established with the called terminal 30a to be connected to another called terminal 30b. If there is, transmits the session movement request to the session mobility control device 200 (S430).

Then, the session mobility controller 200 transmits a call initiation request to the called terminal 30b that needs to establish a new session through the called call controller 320 that processes a session connection to the called terminal 30b that needs to establish a new session. (S435), the response is received (S437).

At this time, the response message from the new destination terminal 30b includes session information on the destination terminal 30b itself. The session information may be at least one of an IP address, supportable codec, media type, and port information.

Thereafter, the session mobility control device 200 receives a call initiation re-request message including the multimedia session information received from the new destination terminal 30b via the incoming call control unit 320 and the outgoing call control unit 310. Transfer to 20a (S440). In addition, the originating terminal 20a transmits a response to the originating call control unit 310 through the incoming call control unit 320, and the originating call control unit 310 transmits the response from the originating terminal 20a to the session mobility control device 200. In step S443). At this time, the response from the calling terminal 20a includes session information of the calling terminal 20a corresponding to the session information of the called terminal 30b in which a new session is established.

In addition, the session mobility controller 200 transmits a confirmation message for the response message to the calling terminal 20a (S445). In addition, a confirmation message is also transmitted to the called terminal 30b in which a new session is established (S450). In this case, the acknowledgment message includes multimedia session information obtained from the calling terminal 20a. Accordingly, a call session is connected between the calling terminal 20a and the new called terminal 30b, and the call is in a state of being available for call (S460). Thereafter, the session mobility control apparatus 200 transmits a call release request to the terminating terminal 30a which has been previously connected to the session through the terminating call control unit 320 (S470), and receives the response (S475).

On the other hand, the above-described session mobility control method can be created by a computer program. The program may also be embodied by being stored in a computer readable media and being read and executed by a computer. The storage medium includes a magnetic recording medium, an optical recording medium and the like.

So far I looked at the preferred embodiments of the present invention. Those skilled in the art will appreciate that the present invention can be implemented in a modified form without departing from the essential features of the present invention. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is shown in the claims, and all differences within the scope equivalent thereto should be construed as being included in the present invention.

1 is an exemplary diagram of a network control system according to an embodiment of the present invention;

2 is a block diagram of an apparatus for controlling session mobility according to an embodiment of the present invention;

3 and 4 are flowcharts of a method for controlling session mobility when a calling terminal is changed according to an embodiment of the present invention;

5 and 6 are flowcharts of a method for controlling session mobility when a called terminal is changed according to an embodiment of the present invention.

Claims (10)

In the session mobility control method based on the Internet Protocol Multimedia Subsystem (IMS), The session mobility control device receives a call initiation request from a calling terminal through a call service control device; The apparatus for controlling session mobility adds and edits information for registering session movement control to the call initiation request; The session mobility control device forwards the edited call initiation request to a called terminal through a call service control device; The session mobility control apparatus may include receiving a session movement request between terminals from a session movement determination apparatus that determines whether or not a preset session mobility exists; And The session mobility control device transmits a call initiation request to the terminal to newly establish a session based on the received session movement request and sets a session when a response is received from the terminal to establish a new session through the call service control apparatus. Transmitting a call initiation re-request through the call service control device to the counterpart terminal, and performing session mobility control between terminals in association with a call service control function; Session mobility control method on a network comprising a. The method of claim 1, The performing of the control may include obtaining multimedia session information of a terminal to be newly set up in response to the call initiation request. The call initiation re-request includes the multimedia session information of the terminal to establish a new session session mobility control method on the network. The method of claim 2, wherein performing the control comprises: In response to the call initiation re-request, the multimedia session information corresponding to the multimedia session information of the terminal to be newly set up is acquired from the session establishment counterpart terminal, and the multimedia session information of the obtained counterpart terminal is transferred to the newly established session. Session mobility control method on a network, characterized in that for transmitting. The method of claim 1, wherein performing the control comprises: After the call initiation re-request is transmitted, transmitting a call release request to a terminal to which a session has been previously set. delete The method of claim 1, And wherein said session move request is a triggering signal. A communication unit for communicating with a network device; And Receives a call initiation request from the originating terminal through the call service control device, adds and edits information for session movement control registration to the received call initiation request, and edits the edited call initiation request through the call service control device. When a session movement request is received from the session movement determining apparatus for determining whether or not the mobility of the preset session is transmitted through the communication unit, the call service control apparatus is transmitted to the terminal to establish a new session based on the received session movement request. A control unit for transmitting a call initiation request and transmitting a call initiation re-request to the session establishment counterpart terminal through a call service control device to perform mobility control on a session established between terminals in association with a call service control function. Session mobility control device on a network, characterized in that. The method of claim 7, wherein The controller transmits a call release request to a terminal having a session previously set. delete In the network control system based on the Internet Protocol Multimedia Subsystem (IMS), A call service control device for performing call service control between a plurality of terminals; A session movement determining apparatus for determining whether or not a preset session mobility is present; And Receives a call initiation request from the originating terminal through the call service control device, adds and edits information for session movement control registration to the received call initiation request, and edits the edited call initiation request through the call service control device. When the session movement request is received from the session movement determining apparatus, based on the received session movement request, a call initiation request is transmitted to the terminal to establish a new session through the call service control apparatus, and to the session establishment counterpart terminal. A session mobility control device for transmitting a call initiation re-request through a call service control device to perform mobility control on a session established between terminals in association with a call service control function; Network control system comprising a.

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