Mobile internet protocol system and route optimization method therefor
First Claim
1. A route optimization method in a mobile Internet Protocol system using a mobile Internet Protocol, the method comprising:
- sending a registration request message containing a care-of address to a home agent through a foreign agent when a mobile host is assigned to the care-of address corresponding to a changed point of access to the Internet, the home agent being a part of a home network for the mobile host to access the Internet, the foreign agent being a part of a foreign network for the mobile host to access the Internet, the home agent being distinguishable from the foreign agent;
storing the care-of address in an internal domain name server database by the home agent, the care-of address being stored to correspond to domain name of the mobile host;
when a query by domain name about the mobile host is received from a correspondent node, sending the care-of address corresponding to the domain name of the mobile host together with caching prevention information to the correspondent node from the home agent, the caching prevention information being set to prevent the correspondent node from caching the care-of address of the mobile host, the caching prevention information being set to prevent any domain name server from caching the care-of address of the mobile host; and
communicating with the mobile host by the correspondent node using the care-of address corresponding to the domain name of the mobile host.
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Accused Products
Abstract
There is provided a route optimization method in a mobile Internet Protocol (IP) system using a mobile Internet Protocol. When a mobile host (MH) moves over the Internet and is assigned to a care-of-address (CoA) corresponding to a changed point of attachment to the Internet, it sends a registration request message containing the care-of address to a home agent (HA) via a foreign agent (FA). The home agent stores the care-of address in relation to a domain name of the mobile host in an internal domain name server database. Upon receipt of a query about the mobile host by domain name from a correspondent node (CN), the home agent sends the care-of address corresponding to the domain name of the mobile host together with caching prevention information to the correspondent node. The caching prevention information is set to prevent the correspondent node or another domain name server from caching the care-of address of the mobile host. The correspondent node communicates with the mobile host using the care-of address.
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Citations
19 Claims
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1. A route optimization method in a mobile Internet Protocol system using a mobile Internet Protocol, the method comprising:
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sending a registration request message containing a care-of address to a home agent through a foreign agent when a mobile host is assigned to the care-of address corresponding to a changed point of access to the Internet, the home agent being a part of a home network for the mobile host to access the Internet, the foreign agent being a part of a foreign network for the mobile host to access the Internet, the home agent being distinguishable from the foreign agent; storing the care-of address in an internal domain name server database by the home agent, the care-of address being stored to correspond to domain name of the mobile host; when a query by domain name about the mobile host is received from a correspondent node, sending the care-of address corresponding to the domain name of the mobile host together with caching prevention information to the correspondent node from the home agent, the caching prevention information being set to prevent the correspondent node from caching the care-of address of the mobile host, the caching prevention information being set to prevent any domain name server from caching the care-of address of the mobile host; and communicating with the mobile host by the correspondent node using the care-of address corresponding to the domain name of the mobile host. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A communication optimization method for communicating through the Internet, the method comprising:
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providing a domain name to a mobile host; storing in a database a care-of address to correspond to the domain name of the mobile host, said storing being performed by a home agent when the care-of address of the mobile host is received, the care-of address corresponding to a new point of attachment when the mobile host attaches to the Internet from the new point of attachment; sending the care-of address corresponding to the domain name of the mobile host together with caching prevention information to a correspondent node by the home agent in response to a query about the mobile host by domain name from the correspondent node, the caching prevention information being set to prevent the correspondent node from caching the care-of address of the mobile host, the caching prevention information being set to prevent any domain name server from caching the care-of address of the mobile host; and communicating with the mobile host by the correspondent node using the care-of address corresponding to the domain name of the mobile host. - View Dependent Claims (9, 10, 11)
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12. A mobile Internet Protocol system, comprising:
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an Internet; a mobile host having a domain name and establishing a link with the Internet; a home agent in a home network, said mobile host attaching to the Internet through said home agent when said mobile host is in the home network; and a foreign agent in a foreign network, said mobile host attaching to the Internet through said foreign agent when said mobile host is moved from the home network to the foreign network; said home agent storing in a domain name server database a care-of address of said mobile host to correspond to the domain name when said mobile host is attached to the Internet through said foreign agent, said home agent storing the care-of address in response to a registration request message sent to said home agent when said mobile host is moved to the foreign network, the registration request message containing the care-of address; said home agent sending to a correspondent node the care-of address and caching prevention information in response to a query from the correspondent node about said mobile host, the query being by domain name, the caching prevention information being set to prevent the correspondent node from caching the care-of address of the mobile host, the caching prevention information being set to prevent any domain name server from caching the care-of address of said mobile host. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification