C
HAPTER
30
| WMM Commands
– 231 –
BSS - Wireless client
ac_number - Access categories (ACs) – voice, video, best effort,
and background. These categories correspond to traffic priority
levels and are mapped to IEEE 802.1D priority tags as shown in
Table 4 on page 94. (Range: 0-3)
LogCwMin - Minimum log value of the contention window. This is the
initial upper limit of the random backoff wait time before wireless
medium access can be attempted. The initial wait time is a random
value between zero and the LogCwMin value. Specify the LogCwMin
value. Note that the LogCwMin value must be equal or less than the
LogCwMax value. (Range: 1-15 microseconds)
LogCwMax - Maximum log value of the contention window. This is
the maximum upper limit of the random backoff wait time before
wireless medium access can be attempted. The contention window
is doubled after each detected collision up to the LogCwMax value.
Note that the CWMax value must be greater or equal to the
LogCwMin value. (Range: 1-15 microseconds)
AIFS - Arbitrary InterFrame Space specifies the minimum amount of
wait time before the next data transmission attempt. (Range: 1-
15 microseconds)
TXOPLimit - Transmission Opportunity Limit specifies the maximum
time an AC transmit queue has access to the wireless medium.
When an AC queue is granted a transmit opportunity, it can transmit
data for a time up to the TxOpLimit. This data bursting greatly
improves the efficiency for high data-rate traffic. (Range: 0-65535
microseconds)
admission_control - The admission control mode for the access
category. When enabled, clients are blocked from using the access
category. (Options: 0 to disable, 1 to enable)
DEFAULT
Table 29: BSS Parameters
Table 28: AP Parameters
WMM Parame-
ters
AC0 (Best Ef-
fort)
AC1 (Back-
ground)
AC2 (Video) AC3 (Voice)
LogCwMin 4 4 3 2
LogCwMax 10 10 4 3
AIFS3722
TXOP Limit 0 0 94 47
Admission
Control
Disabled Disabled Disabled Disabled
WMM Parame-
ters
AC0 (Best Ef-
fort)
AC1 (Back-
ground)
AC2 (Video) AC3 (Voice)
LogCwMin4432
LogCwMax 6 10 4 3
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