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wifi: Aux PHY does not start a frame exchange if main PHY is in RX state

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Otherwise, the main PHY will switch to the link on which the aux PHY is operating
to take over the TXOP, thus dropping the PPDU being received.
This commit is contained in:
Stefano Avallone
2023-08-29 21:36:46 +02:00
committed by Stefano Avallone
parent 56511e5108
commit 468bb004b3
1 changed files with 24 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

28
src/wifi/model/eht/eht-frame-exchange-manager.cc
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@@ -198,11 +198,31 @@ EhtFrameExchangeManager::StartTransmission(Ptr<Txop> edca, uint16_t allowedWidth
return false;
}
if (!emlsrManager->GetAuxPhyTxCapable() &&
m_staMac->GetDevice()->GetPhy(emlsrManager->GetMainPhyId()) != m_phy)
if (auto mainPhy = m_staMac->GetDevice()->GetPhy(emlsrManager->GetMainPhyId());
mainPhy != m_phy)
{
NS_LOG_DEBUG("Aux PHY is not capable of transmitting a PPDU");
return false;
// an aux PHY is operating on this link
if (!emlsrManager->GetAuxPhyTxCapable())
{
NS_LOG_DEBUG("Aux PHY is not capable of transmitting a PPDU");
NotifyChannelReleased(edca);
return false;
}
if (mainPhy->IsStateRx())
{
NS_LOG_DEBUG(
"Main PHY is receiving a PPDU (may be, e.g., an ICF or a Beacon); do not "
"transmit to avoid dropping that PPDU due to the main PHY switching to this "
"link to take over the TXOP");
// Note that we do not prevent a (main or aux) PHY from starting a TXOP when
// an(other) aux PHY is receiving a PPDU. The reason is that if the aux PHY is
// receiving a Beacon frame, the aux PHY will not be affected by the start of
// a TXOP; if the aux PHY is receiving an ICF, the ICF will be dropped by
// ReceiveMpdu because another EMLSR link is being used.
NotifyChannelReleased(edca);
return false;
}
}
}