Multiplex communications – Duplex – Communication over free space
Reexamination Certificate
2008-12-18
2011-11-22
Cho, Hongb (Department: 2467)
Multiplex communications
Duplex
Communication over free space
C370S329000
Reexamination Certificate
active
08064371
ABSTRACT:
In a radio communication system that simultaneously uses plural radio channels, a radio communication apparatus can quickly secure plural radio channels simultaneously used for radio communication while preventing collision with a radio signal transmitted by another radio communication apparatus so away from the radio communication apparatus that the radio communication apparatus cannot detect radio waves.A radio communication apparatus STA1according to the present invention includes a receiving unit10which receives, when a first signal is transmitted via each of the plural radio channels, the first signal though at least one or more radio channels among the plural radio channels, and performs carrier sense for each of the plural radio channels used for the transmission of the first signal, a selecting unit40which selects a radio channel used for radio communication out of radio channels set in a standby state, and a transmitting unit20which transmits a response signal for the first signal via the selected radio channel.
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11.14 20/40 MHz BSS Operation, 11.14.1 Terminology and Rules for Operation in 20/40 MHz BSS, IEEE P802.11n/D5.0, May 2008.
International Search Report dated May 20, 2009 corresponding to U.S. Appl. No. 12/438,845, filed Feb. 25, 2009.
Adachi Tomoko
Hirano Tatsuma
Matsuo Ryoko
Nabetani Toshihisa
Takagi Masahiro
Cho Hongb
Kabushiki Kaisha Toshiba
Turocy & Watson LLP
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