[Ns-bugs] [Bug 737] New: Backoff procedure is not envoked after ACK or CTS timeout

[code@nsnam.ece.gatech.edu]

http://www.nsnam.org/bugzilla/show_bug.cgi?id=737

           Summary: Backoff procedure is not envoked after ACK or CTS
                    timeout
           Product: ns-3
           Version: ns-3-dev
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P5
         Component: wifi
        AssignedTo: ns-bugs at isi.edu
        ReportedBy: andreev at iitp.ru
   Estimated Hours: 0.0


In accordance with 9.2.8 of 802.11-2007 (Ack procedure) "If a
PHY-RXSTART.indication does not occur during the ACKTimeout interval, the
STA concludes that the transmission of the MPDU has failed, and this STA shall
invoke its backoff procedure upon expiration of the ACKTimeout interval." The
same situation is with CTS timeout.

Current implementation starts a backoff procedure inside DCA-TXOP, but only
DcfManager knows about CTS and ACK timeouts.

So, the method like "StartBackoffProcedure" shall be added to DcaTxop and
EdcaTxop, but in this case backoff procedure will be initiated from both
DcaTxop and DcfManager. What about making DcfManager the only place to start
backoff procedure for all queues?


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