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Configuring WMM consists of adjusting parameters on queues for different
categories of wireless traffic. Traffic is sent to the following queues:
High throughput, non time sensitive bulk data e.g.
FTP
Traditional IP data, medium throughput and delay.
Time sensitive video data with minimum time
delay.
Time sensitive data such as VoIP and streaming
media with minimum time delay.
Queues automatically provide minimum transmission delays for video, voice,
multimedia and critical applications. The values can be adjusted further
manually:
Minimum Contention Window (milliseconds): This value is input
to the initial random backoff wait time algorithm for retry of a
data frame transmission. The backoff wait time will be generated
between 0 and this value. If the frame is not sent, the random
backoff value is doubled until the value reaches the number
defined by CWMax (below). The CWMin value must be lower
than the CWMax value.
Maximum Contention Window (milliseconds): This value is the
upper limit to random backoff value doubling (see above).
Arbitration Inter-Frame Space (milliseconds): Specifies additional
time between when a channel goes idle and the AP/client sends
data frames. (Traffic with a lower AIFSN value has a higher
priority)
Transmission Opportunity (milliseconds): The maximum interval
of time an AP can transmit. This makes channel access more
efficiently prioritized. (A greater value means higher priority)
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