Communication system and method therefor
First Claim
1. A communications system comprising:
- a mobile node capable of mobility relative to a first network having a plurality of correspondent nodes, a first interfacing node and a second interfacing node, the plurality of correspondent nodes being capable of sending data to the mobile node via the first interfacing node, the mobile node being capable of moving from a first location associated with the first interfacing node of the first network to a second location associated with the second interfacing node of the first network, whereinthe system uses multicast routing of data when the mobile node moves from the first location to the second location, the mobile node generates binding update information and delivers the binding update information to a multicast address, the binding update information comprises a forwarding address for the mobile node, the forwarding address having been provided to the mobile node by the second interfacing node and the system includes a multicast service unit which delivers the binding update information by multicast routing to correspondent nodes which have joined the multicast group indicated by the multicast address.
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Accused Products
Abstract
Known protocols for supporting mobility in relation to Internet Protocol (IP) networks are not able to efficiently support distribution of Binding Update messages to Correspondent Nodes (104) in a set of fixed IP networks (102). Consequently, the present invention makes use of a multi-cast service provided by the IPv6 protocol in order to deliver Binding Update messages to the Correspondent Nodes (104). The use of the multi-cast service to deliver Binding Update messages avoids a proliferation of such messages which would occur under know protocols requiring a mobile node (106,107) to send the Binding Update message to each Correspondent Node (104). Consequently, use of bandwith in the set of fixed IP networks (102) is more efficient.
13 Citations
10 Claims
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1. A communications system comprising:
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a mobile node capable of mobility relative to a first network having a plurality of correspondent nodes, a first interfacing node and a second interfacing node, the plurality of correspondent nodes being capable of sending data to the mobile node via the first interfacing node, the mobile node being capable of moving from a first location associated with the first interfacing node of the first network to a second location associated with the second interfacing node of the first network, wherein the system uses multicast routing of data when the mobile node moves from the first location to the second location, the mobile node generates binding update information and delivers the binding update information to a multicast address, the binding update information comprises a forwarding address for the mobile node, the forwarding address having been provided to the mobile node by the second interfacing node and the system includes a multicast service unit which delivers the binding update information by multicast routing to correspondent nodes which have joined the multicast group indicated by the multicast address. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of operating a communications system comprising a mobile node capable of mobility relative to a first network and having a plurality of correspondent nodes capable of sending data to the mobile node, comprising the steps of:
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moving the mobile node from a first location associated with a first interfacing node of the first network to a second location associated with a second interfacing node of the first network; receiving, at the mobile node in response to moving, a forwarding address from the second interfacing node, the forwarding address for the mobile node and multicast routing of data used in the system; and generating, by the mobile node, a binding update information; delivering, by the mobile node, to a multicast address the binding update information, the binding update information comprises the forwarding address for the mobile node, the forwarding address having been provided to the mobile node by the second interfacing node; and delivering, by a multicast service unit of the system, the binding update information by multicast routing to correspondent nodes which have joined the multicast group indicated by the multicast address.
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Specification