IP Mobility Within a Communication System
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsPekka Nikander, Henrik Levkowetz
Life of this patent
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Abstract
A method of routing IP traffic to and from a mobile terminal able to connect to the Internet via two or more gateway nodes. The method comprises implementing a multi-addressing multi-homing protocol at each gateway node on behalf of the mobile terminal, and sharing protocol state information between gateway nodes to allow gateway nodes to update state information at the corresponding node when the mobile terminal changes gateway node.
Claims12
A method of routing IP traffic to and from a mobile terminal able to connect to the Internet via two or more gateway nodes, the method comprising:
- allocating to the mobile terminal a terminal identity;
- for each gateway node, allocating to the mobile terminal an IP address;
- providing, at each gateway node and at least one corresponding node, state information mapping the IP address of the gateway to said mobile terminal identity;
- performing address translations at the gateway node and the at least one corresponding node using the state information;
- and
- sharing state information between gateway nodes to allow gateway nodes to update state information at the at least one corresponding node when the mobile terminal changes gateway nodes.
A method of operating a gateway node for routing IP traffic between a corresponding node and a mobile terminal to which a mobile terminal identity is allocated, the method comprising:
- allocating to the mobile terminal an IP address of the gateway node;
- maintaining at the gateway node, state information mapping said IP address to said mobile terminal identity, and;
- performing address translations at the gateway node using the state information;
- and
- sharing state information with one or more other gateway nodes to allow gateway nodes to update state information at the corresponding node, when the mobile terminal changes gateway nodes.
A gateway node for routing IP traffic between a corresponding node and a mobile terminal to which a mobile terminal identity is allocated, the gateway node comprising:
- means for allocating to the mobile terminal an IP address of the gateway node;
- a memory for maintaining state information mapping said IP address to said mobile terminal identity;
- means for performing address translations using the state information;
- and
- communication means for sharing state information with one or more other gateway nodes to allow gateway nodes to update state information at the corresponding node when the mobile terminal changes to a new gateway node.
A method of routing IP traffic to and from a mobile terminal able to connect to the Internet via two or more gateway nodes, the method comprising:
- implementing a multi-addressing multi-homing protocol at each gateway node on behalf of the mobile terminal;
- and
- sharing protocol state information between the gateway nodes to enable the gateway nodes to update state information at a corresponding node when the mobile terminal changes gateway nodes.
Dependencies are inferred from the claim text.