Changes between Version 17 and Version 18 of 802.11/MAC/Lower/Retransmissions


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Timestamp:
May 5, 2015, 3:14:40 PM (9 years ago)
Author:
chunter
Comment:

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  • 802.11/MAC/Lower/Retransmissions

    v17 v18  
    9898
    9999The above example extends [#ExampleS.3 Example S.3] to a third MPDU transmission. The main behavior to notice is that, while MPDU 2 began with a minimum contention window (for reasons explained in  [#ExampleS.3 Example S.3]), MPDU 3 begins with a maximum contention window. In general, the contention window does not reset with every new MPDU. In the event of a string of failures, it will only reset when the SSRC exactly equals the ''dot11ShortRetryLimit''.
     100
     101----
     102
     103= Long MPDUs (MPDU length > ''dot11RTSThreshold'') =
     104
     105== Example L.1 ==
     106
     107{{{
     108#!div style="overflow-x:scroll; border:1pt solid"
     109[[Image(ex_l_1.png)]]
     110}}}
     111
     112
     113The above example shows the ideal scenario the transmission of 2 MPDUs. Each MPDU transmission is initiated with an RTS control frame. A successful CTS response to that RTS transmission instructs the originator to attempt a transmission of the MPDU. A reception of a successful ACK in response to that MPDU transmission keeps all counts and contention window at station at their minimum values.