Telecommunications routing
First Claim
1. A method of controlling routing of packets in a communications network including an infrastructure of packet switching nodes interconnected by packet transport links, and a plurality of access nodes to which a routing path, defined by data held in packet switching nodes located along said routing path, may be directed in said infrastructure for a given network address, said method comprising:
- routing packets along a first routing path for a first network address, wherein the first routing path is directed to a first access node serving a mobile node using said first network address via a communications link, said packets being destined for said mobile node such that said packets are progressively forwarded from upstream neighbor nodes to downstream neighbor nodes;
performing a route redirection process to redirect at least part of said first routing path, said redirection being performed by passing a routing update message from a downstream neighbor to a first upstream neighbor, said first upstream neighbor altering its routing directionality in response to said routing update message and passing a further routing update message to a second upstream neighbor;
wherein said route redirection process comprises said first upstream neighbor placing a temporary blockage on the forwarding of packets destined for said mobile node during said route redirection process.
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Accused Products
Abstract
Routing of packets is controlled in a communications network including an infrastructure of packet switching nodes interconnected by packet transport links, and a plurality of access nodes to which a routing path, defined by data held in packet switching nodes located along the routing path, may be directed in the infrastructure for a given network address.
40 Citations
16 Claims
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1. A method of controlling routing of packets in a communications network including an infrastructure of packet switching nodes interconnected by packet transport links, and a plurality of access nodes to which a routing path, defined by data held in packet switching nodes located along said routing path, may be directed in said infrastructure for a given network address, said method comprising:
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routing packets along a first routing path for a first network address, wherein the first routing path is directed to a first access node serving a mobile node using said first network address via a communications link, said packets being destined for said mobile node such that said packets are progressively forwarded from upstream neighbor nodes to downstream neighbor nodes; performing a route redirection process to redirect at least part of said first routing path, said redirection being performed by passing a routing update message from a downstream neighbor to a first upstream neighbor, said first upstream neighbor altering its routing directionality in response to said routing update message and passing a further routing update message to a second upstream neighbor; wherein said route redirection process comprises said first upstream neighbor placing a temporary blockage on the forwarding of packets destined for said mobile node during said route redirection process. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. Routing apparatus arranged to control routing of packets in a communications network including an infrastructure of packet switching nodes interconnected by packet transport links, and a plurality of access nodes to which a routing path, defined by data held in packet switching nodes located along said routing path, may be directed in said infrastructure for a given network address, said apparatus comprising:
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means for routing packets along a first routing path for a first network address, wherein the first routing path is directed to a first access node serving a mobile node using said first network address via a communications link, said packets being destined for said mobile node such that said packets are progressively forwarded from upstream neighbor nodes to downstream neighbor nodes; means for performing a route redirection process to redirect at least part of said first routing path, said redirection being performed by passing a routing update message from a downstream neighbor to a first upstream neighbor, said first upstream neighbor altering its routing directionality in response to said routing update message and passing a further routing update message to a second upstream neighbor; wherein said route redirection comprises said first upstream neighbor placing a temporary blockage on the forwarding of packets destined for said mobile node during said route redirection process. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification