Method for supporting session mobility

• US 20060126648A1
• Filed: 11/09/2005
• Published: 06/15/2006
• Est. Priority Date: 12/14/2004
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Kim, Kyung-Sook, Park, Hyun-Seo, Kang, Sook-Yang, Bahg, Young-Jick, Rhee, Je-Hun, Shin, Gyung-Chul
• Granted Patent: US 7,570,756 B2
• Time in Patent Office: Days
• US Class Current: 370/401
• CPC Class Codes: H04L 65/1101 Session protocols
• CPC Class Codes: H04L 65/1104 Session initiation protocol [SIP]
• CPC Class Codes: H04L 67/14 Session management for real-time applications in data packet communications networks H04L65/1066
• CPC Class Codes: H04L 67/146 Markers for unambiguous identification of a particular session, e.g. session cookie or URL-encoding

Abstract

A method for supporting session mobility, more particularly, a method for supporting session mobility that can move various sessions between two or more devices by using session initiation protocol (SIP). Various sessions can be simultaneously moved by utilizing a SIP PUBLISH message. Accordingly, a user can utilize various services as they are regardless of changing of service receiving device while the user utilizes various services. Also, the session mobility can be effectively supported whether the target of the session movement is known or not.

Claims

1. A method for supporting session mobility from a first device having respective sessions connected with at least one service device to a second device, comprising:

a) determining whether an address of the second device is defined by the first device when the session movement begins from the first device; and

b) at a), transferring session information including data for supporting session mobility from the first device to the second device when the address of the second device is defined clearly by the first device, and transferring the session information data from the first device to the session management server when the address of the second device is not defined clearly.

2. The method for supporting session mobility of claim 1, wherein the session data is transferred by utilizing a SIP PUBLISH message.

3. The method for supporting session mobility of claim 1, further comprising:

at b), when the session data is transferred to the second device,

c) generating an SIP session establishment message from the second device by using the received session data, and transferring the SIP session establishment message from the second device to a predetermined service device; and

d) establishing new sessions between the service device and the second device by utilizing the received SIP session establishment message.

4. The method for supporting session mobility of claim 3, further comprising:

after d), e) terminating the previously established sessions between the service device and the first device by utilizing the received SIP session establishment message.

5. The method for supporting session mobility of claim 4, further comprising:

after e), f) publishing a result of a session movement from the first device to the second device through a SIP PUBLISH message.

6. The method for supporting session mobility of claim 1, further comprising:

at b), when the session data is transferred to the session management server,

c) storing the session data and the user identification of the received SIP PUBLISH message at the session management server;

d) transferring a SIP SUBSCRIBE message including the user identification from the second device to the session management server;

e) transferring the session data having the same user identification as the user identification included in the SIP SUBSCRIBE message from the session management server to the second device through a SIP NOTIFY message;

f) generating a SIP session establishment message from the second device and transferring the SIP session establishment message to the predetermined service device by utilizing the received SIP NOTIFY message; and

g) establishing new sessions between the service device and the second device by utilizing the received SIP session establishment message.

7. The method for supporting session mobility of claim 6, further comprising

after g), h) terminating the previously established sessions between the service device and the first device by utilizing the received SIP session establishment message.

8. The method for supporting session mobility of claim 7, further comprising:

after h), i) publishing a result of the session movement from the first device to the session management server through a SIP PUBLISH message.

9. The method for supporting session mobility of claim 8, further comprising:

after i), j) notifying a result of the session movement from the session management server to the second device through the SIP NOTIFY message.

10. The method for supporting session mobility of claim 1, wherein the session data includes data needed to establish new session, such as addresses of two peers of the session, a session ID of the session, a cookie, and other session specific information.

11. The method for supporting session mobility of claim 2, wherein the session data is generated for each session, and the SIP PUBLISH message includes at least one session data.