Method and apparatus for use in a communications network
First Claim
1. A method for use in a Proxy Mobile IP network in which a Mobile Node accesses the Proxy Mobile IP network via a plurality of Mobile Access Gateways, the Mobile Access Gateways arranged to handle mobility signalling on behalf of the Mobile Node, the method comprising:
- at a Local Mobility Anchor function, registering a first Care-of-Address associated with the Mobile Node;
receiving a request to register a second Care-of-Address associated with the Mobile Node;
registering the second Care-of-Address associated with the Mobile Node;
sending a request message to one of the plurality of Mobile Access Gateways acting on behalf of the Mobile Node and associated with the first Care-of-Address, the request message instructing the Mobile Access Gateway associated with the first Care-of-Address to check whether the Mobile Node is reachable through the first Care-of-Address;
receiving a response message from the Mobile Access Gateway associated with the first Care-of-Address, the response message being triggered by the request message, wherein the response message includes information informing the Local Mobility Anchor function that the Mobile Node can not be reached using the first Care-of-Address; and
clearing a cache and stopping caching copies of incoming packets directed to the first Care-of-Address.
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Accused Products
Abstract
A method and apparatus for use in a communications network in which a Mobile Node accesses the communications network via a proxy node. The proxy node is arranged to handle mobility signalling on behalf of the Mobile Node. At a mobility anchor function, such as a Local Mobility Anchor, a first Care-of-Address associated with the Mobile Node is registered. When the mobility anchor function receives a registration request to register a second Care-of-Address associated with the Mobile Node, it sends a request message to the proxy node acting on behalf of the Mobile Node. The request message instructs the proxy node to check whether the Mobile Node is reachable using the first Care-of-Address.
10 Citations
9 Claims
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1. A method for use in a Proxy Mobile IP network in which a Mobile Node accesses the Proxy Mobile IP network via a plurality of Mobile Access Gateways, the Mobile Access Gateways arranged to handle mobility signalling on behalf of the Mobile Node, the method comprising:
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at a Local Mobility Anchor function, registering a first Care-of-Address associated with the Mobile Node; receiving a request to register a second Care-of-Address associated with the Mobile Node; registering the second Care-of-Address associated with the Mobile Node; sending a request message to one of the plurality of Mobile Access Gateways acting on behalf of the Mobile Node and associated with the first Care-of-Address, the request message instructing the Mobile Access Gateway associated with the first Care-of-Address to check whether the Mobile Node is reachable through the first Care-of-Address; receiving a response message from the Mobile Access Gateway associated with the first Care-of-Address, the response message being triggered by the request message, wherein the response message includes information informing the Local Mobility Anchor function that the Mobile Node can not be reached using the first Care-of-Address; and clearing a cache and stopping caching copies of incoming packets directed to the first Care-of-Address. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for use in a Proxy Mobile IP network in which a Mobile Node accesses the Proxy Mobile IP network via a plurality of Mobile Access Gateways, the Mobile Access Gateways arranged to handle mobility signalling on behalf of the Mobile Node, the method comprising:
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at a Local Mobility Anchor function, registering a first Care-of-Address associated with the Mobile Node; receiving a request to register a second Care-of-Address associated with the Mobile Node; registering the second Care-of-Address associated with the Mobile Node; sending a request message to one of the plurality of Mobile Access Gateways acting on behalf of the Mobile Node and associated with the first Care-of-Address, the request message instructing the Mobile Access Gateway associated with the first Care-of-Address to check whether the Mobile Node is reachable through the first Care-of-Address; after receiving the registration request to register the second Care-of-Address associated with the Mobile Node, at the Local Mobility Anchor function, caching copies of all incoming packets directed to the first Care-of-Address; at the Local Mobility Anchor function, receiving a message from the Mobile Access Gateway associated with the first Care-of-Address indicating that the Mobile Node is reachable using the first Care-of-Address; and clearing a cache and stopping caching copies of incoming packets directed to the first Care-of-Address.
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9. A Local Mobility Anchor node for use in a Proxy Mobile IP network in which a Mobile Node accesses the Proxy Mobile IP network via a plurality of Mobile Access Gateways, the Local Mobility Anchor node comprising:
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means for registering a first Care-of-Address associated with a Mobile Node; a receiver for receiving a registration request to register a second Care-of-Address associated with the Mobile Node; means for registering the second Care-of-Address; a transmitter for transmitting a request message to one of the plurality of Mobile Access Gateways acting on behalf of the Mobile Node and associated with the first Care-of-Address, the request message instructing the Mobile Access Gateway associated with the first Care-of-Address to determine whether the Mobile Node is reachable through the first Care-of-Address; means for receiving a response message from the Mobile Access Gateway associated with the first Care-of-Address, the response message being triggered by the request message; means for de-registering the first Care-of-Address at the Local Mobility Anchor function; means for caching copies of all incoming packets directed to the first Care-of-Address in a cache; and means for, in the event that the Mobile Node is unreachable using the first Care-of-Address, sending the cached packets to the second Care-of-Address and clearing the cache.
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Specification