Multiplex communications – Communication over free space – Combining or distributing information via time channels
Patent
1997-04-17
1999-03-30
Patel, Ajit
Multiplex communications
Communication over free space
Combining or distributing information via time channels
371 32, H04J 316
Patent
active
058897720
ABSTRACT:
A station in the WLAN monitors each transmitted frame to determine whether the frame transmission was protected by an existing outstanding airtime reservation. If a frame is transmitted without an airtime reservation and no response frame is received, the station assumes that the transmission failed due to contention, and monitors the number of contention attempts made to transmit each frame, and the number of failures to receive an acknowledgement. Based on this information, the station dynamically adjusts an RTS/CTS threshold used to determine whether or not an RTS/CTS exchange mechanism should be enabled. If a frame is transmitted during a time interval protected by an outstanding airtime reservation and no response frame is received, the station assumes that the transmission failed due to a bit error, and monitors the number of bit error rate (BER) attempts made to transmit each frame, and the number of BER failures to receive an acknowledgement. Based on this information, the station dynamically adjusts a fragmentation threshold used to determine whether or not a data frame fragmentation mechanism should be enabled.
REFERENCES:
patent: 5231634 (1993-07-01), Giles et al.
patent: 5440545 (1995-08-01), Buchholz et al.
patent: 5555266 (1996-09-01), Buchholz et al.
patent: 5560021 (1996-09-01), Vook et al.
patent: 5654968 (1997-08-01), Smiroldo
Fischer Matthew J.
Kern William F.
Advanced Micro Devices , Inc.
Lee Chi ho Andrew
Patel Ajit
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