Method and system for data rate based vertical handoff

Details Method and system for data rate based vertical handoff Method and system for data rate based vertical handoff

2005-03-28

2009-06-23

Eng, George (Department: 2617)

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

C370S335000, C455S552100, C455S553100, C455S436000

Reexamination Certificate

active

07551586

ABSTRACT:
A method and system for using data rate as a basis to allow or deny handoff from an IS-856 (e.g., EV-DO) communication system to an IS-2000 (e.g., 1xRTT) communication system. A base station detects that a hybrid terminal has received a threshold low forward link IS-856 data rate for a threshold time period, and the base station will responsively evaluate the IS-2000 system to determine if the IS-2000 system has sufficient resources to provide at least as good a data rate as the IS-856 threshold data rate. If the base station thereby determines that the IS-2000 system is a good alternative, then the base station will allow a handoff to occur when the terminal seeks to handoff to IS-2000. On the other hand, if the base station thereby determines that the IS-2000 system is not a good alternative, then the base station will not allow the handoff to IS-2000.

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McNair et al., “Vertical Handoffs in Fourth-Generation Multinetwork Environments,”IEEE Wireless Communications, pp. 8-15 (2004).
Cheng Wei Lee et al., “A Framework of Handoffs in Wireless Overlay Networks Based on Mobile IPv6,” IEEE Journal on Selected Areas in Communications, vol. 23, No. 11, Nov. 2005.
A. Ezzouhairi et al., “A Fuzzy Decision Making Strategy for Vertical Handoffs,” CCECE/CCGEI, May 2008.

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