Method and system for routing data to a mobile node in a foreign network

Patent metadata

Field	Value
Publication number	US-9432835-B2
Application number	US-201013516038-A
Country	US
Kind code	B2
Filing date	Dec 13, 2010
Priority date	Dec 15, 2009
Publication date	Aug 30, 2016
Grant date	Aug 30, 2016

Abstract

A method for delivering at least one data packet is disclosed originating from a corresponding node in a corresponding network to a mobile node having a home network and being connected to a foreign network different from said home network, the mobile node having a long term IP address belonging to said home network and a care-of-address being the address of an foreign network access router of said foreign network, said networks being connected to an IP network comprising at least one data storage, by respectively a home network access router, a corresponding network access router, and said foreign network access router, the method comprising: a. intercepting said at least one data packet and detecting the destination IP address thereof; b. consulting said at least one data storage, whereby said care-of-address of said mobile node is retrieved by using the destination IP address of said at least one packet; c. forwarding said at least one data packet directly to said care-of-address, and indicating said long term IP address to said foreign network access router.

First claim

The invention claimed is:

1. A method for delivering at least one data packet originating from a corresponding node in a corresponding network to a mobile node having a home network and being connected to a foreign network different from said home network, the mobile node having a long term IP address belonging to said home network and a care-of-address being the address of an foreign network access router of said foreign network, said home network, said corresponding network and said foreign network being coupled to each other by means of an IP network comprising at least one data storage in which storage said long term IP address of the mobile node is linked with the care-of-address of the mobile node, said networks being connected to said IP network by respectively a home network access router, a corresponding network access router, and said foreign network access router, the method comprising performing by said corresponding network access router:
a. intercepting said at least one data packet and detecting a destination IP address thereof;
b. consulting said at least one data storage of the IP network, wherein said care-of-address of said mobile node is retrieved by using the destination IP address of said at least one packet;
c. tunneling said at least one data packet directly to said care-of-address over the internet, and further indicating said long term IP address of said mobile node to said foreign network access router, such that said foreign network access router forwarding said at least one data packet to said mobile node based on link-layer connectivity.

2. A method according to claim 1 , performed on a per data packet basis.

3. A method according to claim 1 , further comprising receiving notifications of changes in said care-of-address of said mobile node, such that consulting said data storage is not performed on a per data packet basis.

4. A method according to claim 1 , wherein said data storage comprises a DNS server.

5. A method according to claim 1 , wherein said forwarding said at least one data packet by said corresponding network access router directly to said care-of-address is based on Layer 3 connectivity of the ISO reference model.

6. A method according to claim 5 , comprising tunneling said at least one data packet between said corresponding network access router and said foreign network access router.

7. A method according to claim 1 , wherein said long term IP address is a public address.

8. An access router for an IP network, comprising at least one processor; and a memory for storing instructions to be executed by the processor for:
delivering at least one data packet originating from a corresponding node in a corresponding network to a mobile node having a home network and being connected to a foreign network different from said home network, the mobile node having a long term IP address belonging to said home network and a care-of-address being the address of an foreign network access router of said foreign network, said home network, said corresponding network and said foreign network being coupled to each other by means of the IP network comprising at least one data storage in which storage said long term IP address of the mobile node is linked with the care-of-address of the mobile node, said networks being connected to said IP network by respectively a home network access router, a corresponding network access router, and said foreign network access router, said at least one processor further arranged for:
intercepting said at least one data packet and detecting a destination IP address thereof,
consulting said at least one data storage of the IP network, wherein said care-of-address of said mobile node is retrieved by using the destination IP address of said at least one packet, and
tunneling said at least one data packet directly to said care-of-address over the internet, and further indicating said long term IP address of said mobile node to said foreign network access router, such that said foreign network access router forwarding said at least one data packet to said mobile node based on link-layer connectivity.

Assignees

• Hublet Christian
• Alcatel Lucent

Inventors

• Hublet Christian

Classifications

• H04W8/082 Primary

  for traffic bypassing of mobility servers, e.g. location registers, home PLMNs or home agents · CPC title

• H04W40/24

  Connectivity information management, e.g. connectivity discovery or connectivity update · CPC title

• H04W8/02

  Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks · CPC title

• H04W8/28 Primary

  Number portability {; Network address portability} · CPC title