Seamless handoff in mobile IP
First Claim
1. A method of handing off a mobile node from an old sub-network router to a new sub-network router in an Internet Protocol based wireless access network, comprising:
- using information from a lower layer of the OSI (Open Systems Interconnection) model to notify the mobile node that a connection with the old sub-network router will be discarded within a predetermined amount of time;
obtaining a new care-of address for the mobile node from the new sub-network router;
sending a request message from the mobile node to a base node via the new sub-network router requesting a new binding;
creating a new care-of address binding in the base node;
issuing a reply message from the base node to the mobile node via the new sub-network router indicating that the new care-of address binding has been created; and
synchronizing a transfer of old care-of address data packets from the base node to the mobile node.
1 Assignment
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Accused Products
Abstract
In a system and method for handing off a mobile node in a seamless manner in a wireless access network, procedures are implemented for allowing the mobile node to synchronize the handoff with a base node (e.g., a home agent) and a correspondent node. In this way, a seamless handoff may be achieved, since few or no data packets sent between the base node or the correspondent node and the mobile node are lost. The procedures are supported by both Mobile IPv4 and Mobile IPv6 as well as Hierarchical Mobile IPv4 and Hierarchical Mobile IPv6.
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Citations
46 Claims
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1. A method of handing off a mobile node from an old sub-network router to a new sub-network router in an Internet Protocol based wireless access network, comprising:
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using information from a lower layer of the OSI (Open Systems Interconnection) model to notify the mobile node that a connection with the old sub-network router will be discarded within a predetermined amount of time;
obtaining a new care-of address for the mobile node from the new sub-network router;
sending a request message from the mobile node to a base node via the new sub-network router requesting a new binding;
creating a new care-of address binding in the base node;
issuing a reply message from the base node to the mobile node via the new sub-network router indicating that the new care-of address binding has been created; and
synchronizing a transfer of old care-of address data packets from the base node to the mobile node. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. An Internet Protocol based wireless access network, comprising:
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a mobile node adapted to obtain a new care-of address from a new sub-network router and to issue a request message via the new sub-network router requesting a new binding upon being notified from a lower layer of the OSI (Open Systems Interconnection) model that a connection with an old sub-network router will be discarded within a predetermined amount of time; and
a base node adapted to create the new care-of address binding upon receiving the request message from the mobile node and to issue a reply message to the mobile node via the new sub-network router indicating that the new care-of address binding has been created;
wherein the mobile node and the base node are further adapted to transfer old care-of address data packets from the base node to the mobile node in a synchronized manner. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
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36. A method of handing off a mobile node from an old sub-network router to a new sub-network router in an Internet Protocol based wireless access network, comprising:
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using information from a lower layer of the OSI (Open Systems Interconnection) model to notify the mobile node that a connection with the old sub-network router will be discarded within a predetermined amount of time;
obtaining a new care-of address for the mobile node from the new sub-network router;
sending a request message from the mobile node to a base node via the new sub-network router requesting a new binding, the base node being predetermined one of a home agent, a gateway foreign agent, and a mobility anchor point;
creating a new care-of address binding in the base node;
issuing a reply message from the base node to the mobile node via the new sub-network router indicating that the new care-of address binding has been created; and
synchronizing a transfer of old care-of address data packets from the base node to the mobile node.
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Specification