Method and apparatus for effecting a handoff between two IP...

Details Method and apparatus for effecting a handoff between two IP... Method and apparatus for effecting a handoff between two IP...

2005-02-01

2005-02-01

Nguyen, Hanh (Department: 2662)

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

C370S389000, C370S352000, C370S228000, C455S436000

Reexamination Certificate

active

06850503

ABSTRACT:
A method900of and wireless communications unit800for effecting a handoff from a first Internet Protocol (IP) connection221to a second IP connection331for a time critical communication is disclosed. The method includes communicating905between a first wireless station219and a second station331using the first IP connection and a first IP address223for the first wireless station; setting up907the second IP connection with a second IP address for the first wireless station, the first IP connection being a primary connection and the second IP connection being a secondary connection, both existing concurrently; determining915that the second IP connection should be the primary connection; and changing917the second IP connection to the primary connection by informing the second station that the second IP address is the primary address using stream control transmission protocol (SCTP) messages, wherein the time critical communication is immediately switched over to the second IP connection.

REFERENCES:
patent: 5974036 (1999-10-01), Acharya et al.
patent: 6243581 (2001-06-01), Jawanda
patent: 6434134 (2002-08-01), La Porta et al.
patent: 6628632 (2003-09-01), Dolan
patent: 20030120716 (2003-06-01), McClellan et al.

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