Multiplex communications – Channel assignment techniques – Carrier sense multiple access
Reexamination Certificate
2004-02-13
2009-06-09
Mattis, Jason E (Department: 2416)
Multiplex communications
Channel assignment techniques
Carrier sense multiple access
C370S328000, C455S296000
Reexamination Certificate
active
07545827
ABSTRACT:
Disclosed are systems and methods which provide a busy tone or signal for use in communication collision avoidance in a wireless network, such as a WLAN, a cellular network, or other point-to-multipoint wireless network. An intelligent busy tone generator, upon the proper conditions, transmits a busy tone or signal to one or more wireless device which may otherwise be hidden from particular communications. According to embodiments the busy tone mimics a carrier sequence of an actual transmission to facilitate the wireless devices recognizing the channel as busy. Because the original uplink packet may be interfered by transmission of a busy tone carrier-sense sequence, embodiments are provided with interference cancellation capability. Interference cancellation circuitry of embodiments may operate in a plurality of modes, including a training mode (including an online training mode, an offline training mode, and a hybrid or combined mode) and an operating mode.
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International Search Report issued for PCT/CN2005/000186, dated May 26, 2005.
Chen Kent
Lau Vincent
Liew Soung C.
Tao Meixia
Wang Yan
Fulbright & Jaworski L.L.P.
Hong Kong Applied Science and Technology Research Institute Co.
Mattis Jason E
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