Atheros AP222A, Руководство пользователя

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COMPANY CONFIDENTIAL 40
2.5.2.5 WMM related
WMM commands are provided to manage the WMM link settings. In order to specify the proper parameters,
each command must specify the access category (AC) and mode (either STA or AP).
Table 9 Access Categories and Modes
Value Symbol Description
Access Categories
0 AC_BE Best Effort
1 AC_BK Background
2 AC_VI Video
3 AC_VO Voice
Mode Parameter
0 AP AP Mode – update AP WMM table
1 STA Station Mode – update Station WMM tables
The parameters accessible for WMM operations are specified in the WMM (including WMM Power Save)
Specification
. These parameters control how the time slots or “TXOPs” are metered out for each traffic stream.
The parameters accessible in the Atheros Fusion driver are as follows:
Table 10 WMM Parameter Definitions
Parameter Units Description
ACM 1|0 Admission Control Mandatory. This flag indicates that Admission Control
is required for the specified AC. A value of 1 indicates that Admission
control is required, 0 indicates not required.
AIFSN slots This is the number of time slots inside the Arbitration Interframe space to be
used. The minimum value is 2.
logCWmin
CW
min
!
2
log min
-1
Minimum backoff timer limit. This is specified in “log” units, where the
actual value of CWmin is expressed as shown
logCWmax
CW
max
!
2
log min
-1
Maximum backoff timer limit. This is specified in “log” units, where the
actual value of CWmax is expressed as shown
TXOPlimit 32 us Maximum duration for a TXOP as negotiated with the station. A value of 0
for this parameter indicates that a single MSDU or MMPDU in addition to a
possible RTS/CTS or CTS to itself may be transmitted at any PHY rate for
each TXOP.
NoACK
Policy 1|0 A value of 1 indicates that there is no acknowledgement expected for the
frame, where a value of 0 indicates that an ACK frame is expected.
acm
#iwpriv ath N acm AC Mode value
The ACM value for each access category is set using the acm command. The AC and Mode values must
be set for this command. The value is the ACM value (see Table 9 Access Categories and Modes
) for the specific access category. This command has a corresponding get command that returns the current
setting for the indicated AC and mode.
#iwpriv ath0 acm 0 1 1
#iwpriv ath0 get_acm 0 1
ath0 get_acm:1