US 6,983,167 B2
Wireless communication system and wireless station
Tomoko Adachi, Urayasu (Japan); Kuniaki Ito, Kawasaki (Japan); Hideo Kasami, Kawasaki (Japan); and Kiyoshi Toshimitsu, Yokohama (Japan)
Assigned to Kabushiki Kaisha Toshiba, Tokyo (Japan)
Filed on Aug. 06, 2002, as Appl. No. 10/212,242.
Claims priority of application No. 2001-239198 (JP), filed on Aug. 07, 2001.
Prior Publication US 2003/0036404 A1, Feb. 20, 2003
Int. Cl. H04Q 7/20 (2006.01)
U.S. Cl. 455—522 21 Claims
OG exemplary drawing
 
5. A wireless communication system which exchanges data between an access point and plural stations by CSMA (Carrier Sense Multiple Access), wherein at least one of said stations comprises:
a received power measurement unit which measures received power when data transmitted from said access point is received;
a received data type detection unit which detects the type of the received data;
a beam gain estimation unit which determines the presence/absence of directional beam control in said access point, on the basis of the received power measured by said received power measurement unit, and the received data type detected by said received data type detection unit;
a transmitter power control unit which controls transmitting power for transmitting data to said access point, in accordance with the result of the determination by said beam gain estimation unit; and
a carrier sense control unit which controls the carrier sense level of said station in accordance with the result of the determination by said beam gain estimation unit.