Changes between Version 1 and Version 2 of 802.11/MAC/Lower/DTIM


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Timestamp:
Jan 13, 2017, 1:24:29 PM (7 years ago)
Author:
chunter
Comment:

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  • 802.11/MAC/Lower/DTIM

    v1 v2  
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    33= 802.11 Reference Design: DTIM Multicast Buffering =
     4
     5Many 802.11 client stations use a power savings mode in order to sleep when they are not actively transmitting or receiving. Part of the responsibility of an 802.11 AP is to defer multicast transmissions until a specified time when all client stations will wake from their power savings doze period in order to receive the traffic. The 802.11 standard specifies the time for multicast transmissions to be immediately following a beacon transmission that contains a Delivery Traffic Indication Message (DTIM).
     6
     7[[Image(DTIM_timeline.png,width=1000)]]
     8
     9The above diagram illustrates how the Mango 802.11 Reference Design schedules its transmissions to abide by the 802.11 standard when DTIM multicast buffering is enabled. After a DTIM beacon, all unicast traffic is suspended while the AP is able to dequeue all buffered multicast packets in a burst.