Radio communication apparatus and method

Details Radio communication apparatus and method Radio communication apparatus and method

2008-03-12

2011-11-22

Nguyen, Tuan H (Department: 2618)

Telecommunications

Transmitter and receiver at separate stations

Frequency or phase modulation

C455S450000, C455S452100, C455S452200, C370S437000, C370S450000

Reexamination Certificate

active

08064833

ABSTRACT:
A radio communication apparatus which uses a first radio communication system that makes a radio communication by sharing frequencies with a second radio communication system, the apparatus includes a detection unit configured to detect an available frequency channel which fails to be used by the second radio communication system in a frequency band used by the first radio communication system, and a transmission unit configured to transmit, using the available frequency channel, a frame which includes a signal sequence which is used to identify whether or not the frame is transmitted by a radio communication terminal belonging to the first radio communication system by detecting the available frequency channel, the signal sequence being predetermined for the first radio communication system.

REFERENCES:
patent: 2005/0220230 (2005-10-01), Fukuda
patent: 2007/0287464 (2007-12-01), Hamamoto et al.
patent: 2000-188583 (2000-07-01), None
patent: 2005-252219 (2005-09-01), None
patent: 2005295085 (2005-10-01), None
patent: 2006-49715 (2006-02-01), None
patent: 2007053546 (2007-03-01), None
Joseph Mitola, III, “Cognitive Radio for Flexible Mobile Multimedia Communications”, IEEE, Jun. 1999, 8 pps.
Official Action dated Sep. 15, 2009 for corresponding Japanese patent application No. 2007-131847 (with English translation).

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