Session transfer method and method for supporting session continuity

• US 9,119,117 B2
• Filed: 08/11/2009
• Issued: 08/25/2015
• Est. Priority Date: 07/25/2007
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Song, Jae-Seung, Kim, Hyun-Sook
• Primary Examiner(s): Nguyen, Thuong
• Application Number:
  US12/539,415
• Publication Number:
  US 20100011112A1
• Time in Patent Office: 2,205 Days
• Field of Search: 709/227, 709/228, 455/436, 455/442, 455/411, 370/352, 370/331, 370/328
• US Class Current: 1/1
• CPC Class Codes: H04L 65/1016 IP multimedia subsystem [IMS]
• CPC Class Codes: H04L 65/1083 In-session procedures
• CPC Class Codes: H04L 65/1095 Inter-network session transfer or sharing
• CPC Class Codes: H04W 36/0011 for data sessions of end-to-end connection
• CPC Class Codes: H04W 36/0016 Hand-off preparation specially adapted for end-to-end data sessions
• CPC Class Codes: H04W 36/0027 for a plurality of data sessions of end-to-end connections, e.g. multi-call or multi-bearer end-to-end data connections
• CPC Class Codes: H04W 36/144 over a different radio air interface technology
• CPC Class Codes: H04W 36/18 for allowing seamless reselection, e.g. soft reselection
• CPC Class Codes: H04W 80/10 adapted for application session management, e.g. SIP [Session Initiation Protocol] connection management H04W76/00; arrangements for session management H04L67/14

Abstract

A device and method for transferring a session. The method includes receiving a session continuity operator policy while performing a session with a target terminal via an original network; storing the session continuity operator policy; determining whether to transfer a whole or part of the session to a server according to a parameter in at least the session continuity operator policy; and sending to the server a session invitation message for a session transfer to transfer of the whole of the session if the whole of the session is determined to be transferred. The session invitation message includes information on at least one data to be transferred among a voice data and a non-voice data on the session. The session transfer corresponds to a PS (Packet Switching) to PS transfer.

Claims

1. A method for transferring a session for a first terminal that cooperates with a network, the method performed by the first terminal and comprising:

receiving, by the first terminal, a session continuity operator policy while performing the session with a second terminal via an original network, wherein the session continuity operator policy includes a parameter indicating a preferred network for a transfer of an ongoing session, and session continuity level information including one of a first level indicating that the first terminal starts a session transfer to the preferred network and a second level indicating that starting of the session transfer is performed based on a decision of the first terminal;

storing the session continuity operator policy;

determining, by the first terminal, whether to transfer a whole or part of the session to a server according to a parameter in at least the session continuity operator policy; and

sending, by the first terminal, to the server a first session invite message for the session transfer to transfer the whole of the session if the whole of the session should be transferred or transfer the part of the session if the part of the session should be transferred, unless the session continuity level information of the session continuity operator policy is the second level and the first terminal decides not to start the session transfer,

wherein the first session invite message includes a Request Uniform Resource Identifier (R-URI) and information about at least one data to be transferred among voice data and non-voice data for the session,

wherein the session transfer corresponds to a Packet Switching (PS) to PS transfer, and

wherein a second session invite message is transmitted from the server to the second terminal within the preferred network to achieve session continuity.

2. The method of claim 1, wherein the first session invite message includes a Replace header.

3. The method of claim 1, wherein the session continuity operator policy includes a parameter indicating a type of session transfer.

4. The method of claim 1, wherein the session continuity operator policy includes a parameter indicating an unallowable domain or network.

5. The method of claim 1, wherein the first terminal starts the session transfer as soon as possible when the session continuity level information includes the first level.

6. The method of claim 1, wherein the session continuity operator policy is transmitted through an Open Mobile Alliance (OMA) Device Management (DM) interface.

7. The method of claim 1, wherein the session continuity operator policy includes restricted networks.

8. A method for supporting session continuity for a first terminal that cooperates with a network, the method performed by the network and comprising:

sending, by the network, a session continuity operator policy while the first terminal is performing a session through an original network with a second terminal, the session continuity operator policy including a parameter indicating whether to transfer a whole or part of the session as a session transfer, wherein the session continuity operator policy includes a parameter indicating a preferred network for a transfer of an ongoing session, and session continuity level information including one of a first level indicating that the first terminal starts a session transfer to the preferred network and a second level indicating that starting of the session transfer is performed based on a decision of the first terminal;

receiving, by the network, a first session invite message from the first terminal to transfer the whole of the session or transfer the part of the session, unless the session continuity level information of the operator policy is the second level and the first terminal decides not to start session transfer; and

sending, by the network, a second session invite message to the second terminal to transfer the session to the target network, in response to a receipt of the first session invite message,

wherein the first session invite message includes a Request Uniform Resource Identifier (R-URI) and includes information about at least one data to be transferred among voice data and non-voice data for the session,

wherein the session transfer corresponds to PS (Packet Switching) to PS transfer, and

wherein a second session invite message is transmitted from the server to the second terminal within the preferred network to achieve session continuity.

9. The method of claim 8, wherein the first session invite message includes a Replace header.

10. The method of claim 8, wherein the session continuity operator policy includes a parameter indicating a type of session transfer.

11. The method of claim 8, wherein the session continuity operator policy includes a parameter indicating an unallowable domain or network for the session transfer.

12. The method of claim 8, further comprising:

generating the session continuity operator policy based on collected information.

13. The method of claim 12, wherein the information is received from an external entity or collected by the server.

14. The method of claim 8, further comprising:

receiving the session continuity operator policy from an external entity.

15. The method of claim 8, wherein the first terminal starts the session transfer as soon as possible when the session continuity level information includes the first level.

16. The method of claim 8, wherein the session continuity operator policy is received through an Open Mobile Alliance (OMA) Device Management (DM) interface.

17. The method of claim 8, wherein the session continuity operator policy includes restricted networks.