Electrical computers and digital processing systems: multicomput – Computer-to-computer data routing
Reexamination Certificate
2009-10-02
2011-11-22
Harrell, Robert B (Department: 2442)
Electrical computers and digital processing systems: multicomput
Computer-to-computer data routing
Reexamination Certificate
active
08065432
ABSTRACT:
A method and system for preventing packet loss during handoff of a mobile host between access networks. In accordance with an aspect of the invention, a home agent on a network maintains a FIFO (First In-First Out) buffer for every mobile host that it serves. When a packet destined for a particular mobile host is received at the home agent, it is assigned an incremental sequence number, encapsulated as an IP packet, and forwarded to the mobile host with the sequence number as an identifier. The packet and sequence number are thereafter stored in the buffer for a period of time after the packet was forwarded to the mobile host. After hand-off to the arriving network is completed, the mobile host sends the sequence number of the last-received IP packet to the home agent and the new care-of IP address. Using this sequence number, the home agent then determines whether any incoming packets had been routed to the previous care-of IP address. These are retrieved from the buffer, and resent to the new care-of IP address.
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patent: 6510144 (2003-01-01), Dommety et al.
patent: 6985463 (2006-01-01), Wright et al.
patent: 7600040 (2009-10-01), Henry et al.
Krishnamurthi et al. “Buffer Management for Smooth HandOvers in Mobile IPv6”, Mobile IP Working Group, Internet Draft, Jul. 13, 2010, pp. 1-21.
“Behavior of a Mobilty Agent in Mobile IP in order to Manage the Flow” by Ishibashi, et al., Mobile IP Working Group, Internet Draft, http://216.239.51.100/search?q=cache:qRJDor5o5WwC:www/ietf.org/internet-d-rafts/draft, Date: Oct. 2001.
Henry Paul Shala
Luo Hui
AT&T Intellectual Property II L.P.
Harrell Robert B
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