Access router based mobile ipv6 fast handover method

• US 20070109997A1
• Filed: 05/06/2004
• Published: 05/17/2007
• Est. Priority Date: 11/26/2003
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Kim, Hyoung-Jun, Shin, Myung-Ki, Park, Jung-Soo, Park, Ki-Shik, Hong, Yong-Geun
• Granted Patent: US 8,000,297 B2
• Time in Patent Office: Days
• US Class Current: 370/331
• CPC Class Codes: H04L 67/04 specially adapted for terminals or networks with limited capabilities; specially adapted for terminal portability
• CPC Class Codes: H04L 69/16 Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
• CPC Class Codes: H04W 36/0055 Transmission or use of information for re-establishing the radio link
• CPC Class Codes: H04W 36/16 Performing reselection for specific purposes
• CPC Class Codes: H04W 64/006 with additional information processing, e.g. for direction or speed determination
• CPC Class Codes: H04W 8/26 Network addressing or numbering for mobility support

Abstract

Provided is a mobile IPv6 fast handovers method, which includes the steps of: a) if a mobile node is moved in a layer 2, receiving a modified RS message from a mobile node in the access router, b) detecting movement of the mobile node in a layer 3 in the access router, c) if the mobile node makes a movement in the layer 3, generating CoA of the mobile node in the access router; d) performing Duplicate Address Detection in the access router to inspect uniqueness of the generated CoA; and e) transmitting a modified RA message to the mobile node in the access router. The Fast Handovers method of the present research performs fast movement detection by using layer 2 information simply and efficiently for fast handover in the mobile IPv6 and generates CoA in the access router instead of the mobile node without operations of many additional messages.

Claims

1. A method for performing mobile IPv6 fast handover based on an access router (AR), comprising the steps of:

a) if a mobile node is moved in a layer 2, receiving a modified RS message from a mobile node (MN) in the access router;

b) detecting movement of the mobile node in a layer 3 in the access router based on the modified RS message transmitted from the mobile node in the access router;

c) if the mobile node moves in the layer 3, generating a new Care of Address (CoA) of the mobile node in the access router;

d) performing Duplicate Address Detection (DAD) in the access router to inspect uniqueness of the generated CoA; and

e) transmitting a modified Router Advertisement (RA) message, which corresponds to the modified RS message transmitted from the mobile node, to the mobile node in the access router.

2. The method as recited in claim 1, wherein the step a) includes the steps of:

a1) receiving a reassociation request message from the mobile node in the access point; and

a2) transmitting a reassociation reply message corresponding to the reassociation request message to the mobile node in the access point.

3. The method as recited in claim 1, further comprising:

a3) receiving the modified RA message transmitted from the access router, using the CoA specified in the modified RA message, which is transmitted from the access router, as a network interface address of the mobile node without DAD, and performing binding update in the mobile node.

4. The method as recited in claim 1, wherein, in the step a), the access router receives the RS message from the mobile node as soon as the layer 2 handover is completed in the mobile node.

5. The method as recited in claim 4, wherein, the step b), the movement of the mobile node in the layer 3 is detected by comparing a neighbor cache value of the access router and a layer 2 identifier of the mobile node included in the modified RS message, which is transmitted from the mobile node.

6. The method as recited in claim 5, wherein the modified RS message includes a flag which signifies the generation of CoA (CoA Generate).

7. The method as recited in claim 6, wherein the modified RA message includes a flag which signifies the generation of CoA (CoA Generate).

8. The method as recited in claim 7, wherein the modified RA message includes a CoA which is generated in the step c).

9. The method as recited in claim 8, wherein the modified RA message includes a flag which signifies that the CoA is included in a prefix.