[Ns-developers] EDCA and WifiRemoteStation

[Mathieu Lacage]

On Sun, 2009-05-24 at 20:09 +0200, Mirko Banchi wrote:
> Mathieu Lacage ha scritto:
> > On Wed, 2009-05-20 at 17:39 +0200, Ramon Bauza wrote:
> >> Hello,
> >>
> >> I would like to tell you something I have observed regarding the EDCA
> >> mechanism and the WifiRemoteStation. I have realized that different packets
> >> addressed to the same peer station contending for the medium at the same
> >> time but enqueued in different AC queues share the same WifiRemoteStation.
> >> This means that these packets share also the same m_slrc and m_ssrc
> >> variables. Therefore, when an ACK is not received for a transmitted packet,
> >> the common m_slrc variable would be incremented causing a reduction of the
> >> transmission opportunities for the rest of the packets (destinated for the
> >> same station but enqued in different AC queues).  Am I right about my
> >> observation? If am not wrong, m_slrc and m_ssrc variables should be
> > 
> > I think that you are right.
> > 
> >> considered per packet and not per peer station.
> > 
> > Well, they are both per packet and per peer station. I don't have any
> > bright idea on how to fix this problem for now.
> > 
> > regards,
> > Mathieu
> > 
> > 
> 
> I agree. Maybe we could add a parameter to
> WifiRemoteStation::ReportDataFailed in order to specify the access class
> which the m_currentPacket belongs.

that sounds like a good idea. Will it work with HCCA ?

Mathieu