System information

 Wi-Fi Multimedia
Working Principles of Basic Functions
WMM Operating
 If the random backoff time ends and no collision is detected, AP starts to transmit
this packet
 WMM enabled devices create four queues for different categories, data packets
will be assigned to different queues according to its access category and priority.
 Each queue follows the described
mechanism and is configured with
different AIFS cwMin cwMax
different AIFS
,
cwMin
,
cwMax
parameters.
 Queues with higher priority are
configured with lower
S/ / (l
AIF
S/
cwMin
/
cwMax
(l
ower waiting
time) to make sure the packet has
higher chances to be transmitted.
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