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公开(公告)号：JPH10303930A
公开(公告)日：1998-11-13
申请号：JP2837998
申请日：1998-02-10
Applicant: ADVANCED MICRO DEVICES INC
Inventor： FISHER MATTHEW J , KERN WILLIAM F
Abstract: PROBLEM TO BE SOLVED: To obtain the most possible WLAN(wireless local network) throughput to a current operation conduction by dynamically adjusting PTS/CTS threshold and division threshold. SOLUTION: A monitor/adjusting unit 112 receives a TX state and medium reservation state information from a data processing unit 102 and decides a value that dynamically adjusts RTS/CTS threshold and division threshold. It specifically monitors data transmission to each of (n+1) destination addresses in a WLAN and calculates DA (0...n) RTS threshold and DA(0...n) Frag threshold which represent the RTS/CTS threshold and the division threshold which are separately and dynamically adjusted to each destination address in the WLAN. Also, STA RTS threshold that represents an average RTS/CTS threshold level which is adjusted to an entire WLAN is given to a TX queuing unit 104 and a TX unit 108.
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公开(公告)号：DE69838360T2
公开(公告)日：2008-05-29
申请号：DE69838360
申请日：1998-01-21
Applicant: ADVANCED MICRO DEVICES INC
Inventor： FISHER MATTHEW J , KERN WILLIAM F
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.
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公开(公告)号：DE69838360D1
公开(公告)日：2007-10-18
申请号：DE69838360
申请日：1998-01-21
Applicant: ADVANCED MICRO DEVICES INC
Inventor： FISHER MATTHEW J , KERN WILLIAM F
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.
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