[Ns-developers] EDCA and WifiRemoteStation

[Mirko Banchi]

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.

Mirko

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Mirko Banchi

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