Method for providing seamless mobility to a mobile node in an optimized fashion

• US 20050164729A1
• Filed: 01/28/2004
• Published: 07/28/2005
• Est. Priority Date: 01/28/2004
• Status: Abandoned Application

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Narayanan, Vidya, Lewis, Adam C., Jung, Cynthia M.
• Application Number:
  US10/767,127
• Publication Number:
  US 20050164729A1
• Time in Patent Office: Days
• US Class Current: 455/522
• CPC Class Codes: H04W 8/14 between corresponding nodes
• CPC Class Codes: H04W 8/26 Network addressing or numbering for mobility support
• CPC Class Codes: H04W 80/04 Network layer protocols, e.g. mobile IP [Internet Protocol]

Abstract

A method for providing seamless mobility to a first device (102) in a system (100) comprising at least the first device, a second device (104/106) and a routing infrastructure (108) is disclosed herein. The routing infrastructure comprises a plurality of routers used to communicate information between the first device and the second device. In operation, the first device receives an anycast address and injects an updated route to the anycast address into the routing infrastructure each time the first device roams to a different subnet. The first device sends a binding update to the second device informing the second device of the anycast address, after which, the first device receives information from the second device via the anycast address regardless of a location of the first device in the system.

Claims

1. In a system comprising at least a first device, a second device and a routing infrastructure comprising a plurality of routers used to communicate information between the first device and the second device, a method comprising the steps of:

at the first device;

receiving an anycast address;

injecting an updated route to the anycast address into the routing infrastructure each time the first device roams to a different subnet;

sending a binding update to the second device informing the second device of the anycast address; and

receiving information from the second device via the anycast address regardless of a location of the first device in the system.

2. The method of claim 1 wherein the anycast address is topologically independent.

3. The method of claim 1 wherein the anycast address remains constant while the first device is powered on.

4. The method of claim 1 wherein the second device is a home agent for the first device.

5. The method of claim 1 wherein the second device is a correspondent device in the system.

6. The method of claim 1 wherein the step of receiving an anycast address is performed when the first device is powered on.

7. The method of claim 1 wherein the step of receiving an anycast address is performed when the first device roams to a first foreign subnet.

8. The method of claim 1 wherein the anycast address is an anycast care-of-address.

9. The method of claim 1 wherein the anycast address is an anycast home address.

10. The method of claim 1 wherein the location of the first device is transparent to the second device.

11. The method of claim 1 further comprising the steps of:

attaching to a mobile router; and

receiving information from the second device via an address assigned to the mobile router.

12. The method of claim 11 further comprising the steps of:

de-attaching from the mobile router;

attaching to a new subnet;

injecting an updated route to the anycast address into the routing infrastructure; and

receiving information from the second device via the anycast address.