[Ns-developers] Block ack Timeout

[Mirko Banchi]

Hi all, on these days i'm completing 802.11n block ack
implementation...i think that within a week i'll ready to publish the
repository on code.nsnam.org for first feedbacks. I've a question about
calculation of timeout value for block ack. Method
ns3::MacLow::StartDataTxTimers now has also lines like these:

...
else if (m_txParams.MustWaitBlockAck ())
    {
      Time timerDelay = txDuration + GetBlockAckTimeout ();
      NS_ASSERT (m_blockAckTimeoutEvent.IsExpired ());
      m_blockAckTimeoutEvent = Simulator::Schedule (timerDelay,
&MacLow::BlockAckTimeout, this);
    }
  else if (m_txParams.MustWaitCompressedBlockAck ())
    {
      Time timerDelay = txDuration + GetBlockAckTimeout ();
      NS_ASSERT (m_blockAckTimeoutEvent.IsExpired ());
      m_blockAckTimeoutEvent = Simulator::Schedule (timerDelay,
&MacLow::BlockAckTimeout, this);
    }
...

The two implemented variants are basic block ack with a 128 bytes bitmap
and compressed block ack with a 64 bits bitmap. How we should calculate
timeout value for the two variants? In the standard i haven't found that .

I've looked to method ns3::WifiMac::GetDefaultCtsAckTimeout. How should
be defined a similar method GetDefaultBlockAckTimeout?

Thanks,
Mirko

-- 
Mirko Banchi

e-mail:    mk.banchi at gmail.com
e-mail:    mk.banchi at virgilio.it
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