Session transfer method and method for supporting session continuity

• US 8,949,435 B2
• Filed: 06/16/2008
• Issued: 02/03/2015
• 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:
  US12/517,877
• Publication Number:
  US 20100325286A1
• Time in Patent Office: 2,423 Days
• Field of Search: 709/227, 709/228, 455/436, 455/442, 455/411, 370/352, 370/331, 370/328
• US Class Current: 709/227
• 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 36/14 Reselecting a network or an air interface
• 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 method for supporting session continuity for a terminal in a server including generating a session continuity operator policy, under a state that a first terminal is performing a session with a second terminal through a first network, and the generated session continuity operator policy supports multimedia sessions for both voice data and non-voice data and includes operator policy parameters indicating whether only voice data, only non-voice data, or both voice and non-voice data is to be transferred to a second network; sending the generated session continuity operator policy to the first terminal; receiving a session invite message from the first terminal via a target network in response to the first terminal having received the generated session continuity operator policy; and sending a session re-invite message to the second terminal so as to achieve session continuity via said second network after receiving the session invite message from the first terminal.

Claims

1. A method for supporting session continuity for a terminal in a server, the method comprising:

sending, by a server, a session continuity operator policy to a first terminal which is engaged in an ongoing session with a second terminal, wherein the session continuity operator policy includes a parameter indicating a preferred network for a transfer of the 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 server, a first session invite message from the first terminal via a target network within the preferred network, 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; and

sending, by the server, a second session invite message to the second terminal to achieve session continuity to the target network after receiving the first session invite message from the first terminal.

2. The method of claim 1, wherein the session continuity operator policy includes at least one parameter indicating a kind of the session transfer.

3. The method of claim 1, wherein the session continuity operator policy includes at least one parameter indicating whether both voice data and non-voice data are required to be transferred or a specific one thereof is required to be transferred.

4. The method of claim 1, wherein the session continuity operator policy includes at least one parameter indicating an unallowable domain or network for the transfer of the session.

5. The method of claim 1, wherein the session continuity operator policy includes at least one parameter indicating whether the session continuity operator policy is temporary or it is required to be continuously maintained in the first terminal, and a parameter indicating an expire time for the session continuity operator policy.

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

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

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

9. A method for transferring a session, the method comprising:

considering, by a first terminal, a session continuity operator policy, 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 a preferred network and a second level indicating that starting of the session transfer is performed based on a decision of the first terminal;

sending, by the first terminal to a server, a first session invite message via a target network within the preferred network, 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; and

sending a second session invite message to the second terminal to achieve session continuity to the target network after receiving the first session invite message from the first terminal.

10. The method of claim 9, wherein the session continuity operator policy includes at least one parameter indicating a kind of the transfer of the session.

11. The method of claim 9, wherein the session continuity operator policy includes at least one parameter indicating whether both voice data and non-voice data are required to be transferred or a specific one thereof is required to be transferred.

12. The method of claim 9, wherein the session continuity operator policy includes at least one parameter indicating an unallowable domain or network for the transfer of the session.

13. The method of claim 9, wherein the session continuity operator policy includes at least one parameter indicating whether the session continuity operator policy is required to be continuously stored, and a parameter indicating an expiration time for the session continuity operator policy.

14. The method of claim 9, wherein the first terminal starts the session transfer as soon as possible when the session continuity level information includes the first level.

15. The method of claim 9, wherein the session continuity operator policy is received through an Open Mobile Alliance (OMA) Device Management (DM) interface.

16. The method of claim 9, wherein the session continuity operator policy includes restricted networks.