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wifi: Check if an EMLSR client can respond to a BSRP TF (ICF)

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This commit is contained in:
Stefano Avallone
2024-06-02 15:58:11 +02:00
committed by Stefano Avallone
parent 3c868fce40
commit 0bc0931d64
3 changed files with 48 additions and 14 deletions
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52
src/wifi/model/eht/eht-frame-exchange-manager.cc
View File

@@ -796,6 +796,30 @@ EhtFrameExchangeManager::ReceivedQosNullAfterBsrpTf(Mac48Address sender)
HeFrameExchangeManager::ReceivedQosNullAfterBsrpTf(sender);
}
bool
EhtFrameExchangeManager::EmlsrClientCannotRespondToIcf() const
{
NS_ASSERT(m_staMac);
if (m_staMac->IsEmlsrLink(m_linkId))
{
auto mainPhy = m_staMac->GetDevice()->GetPhy(m_staMac->GetEmlsrManager()->GetMainPhyId());
// while an ICF is being received on this link, an aux PHY that is not TX capable may get
// a TXOP on another link, release the channel and request the main PHY to switch channel.
// It may be decided to have the main PHY start a TXOP on the other link a PIFS after the
// channel switch (e.g., MAC header information is not used and AllowUlTxopInRx is true).
// Thus, when the ICF is received on this link, it is not dropped but, when the CTS must
// be transmitted, the main PHY has already started transmitting on the other link. In
// such a case, do not respond to the ICF.
if (mainPhy->IsStateSwitching() || m_mac->GetLinkForPhy(mainPhy) != m_linkId)
{
NS_LOG_DEBUG("Main PHY is switching or operating on another link, abort ICF response");
return true;
}
}
return false;
}
void
EhtFrameExchangeManager::SendCtsAfterMuRts(const WifiMacHeader& muRtsHdr,
const CtrlTriggerHeader& trigger,
@@ -803,24 +827,26 @@ EhtFrameExchangeManager::SendCtsAfterMuRts(const WifiMacHeader& muRtsHdr,
{
NS_LOG_FUNCTION(this << muRtsHdr << trigger << muRtsSnr);
NS_ASSERT(m_staMac);
if (auto emlsrManager = m_staMac->GetEmlsrManager())
if (EmlsrClientCannotRespondToIcf())
{
auto mainPhy = m_staMac->GetDevice()->GetPhy(emlsrManager->GetMainPhyId());
// an aux PHY that is not TX capable may get a TXOP, release the channel and request
// the main PHY to switch channel. Shortly afterwards, the AP MLD may send an ICF, thus
// when the main PHY is scheduled to send the CTS, the main PHY may be switching channel
// or may be operating on another link
if (mainPhy->IsStateSwitching() || m_mac->GetLinkForPhy(mainPhy) != m_linkId)
{
NS_LOG_DEBUG("Main PHY is switching or operating on another link, abort sending CTS");
return;
}
return;
}
HeFrameExchangeManager::SendCtsAfterMuRts(muRtsHdr, trigger, muRtsSnr);
}
void
EhtFrameExchangeManager::SendQosNullFramesInTbPpdu(const CtrlTriggerHeader& trigger,
const WifiMacHeader& hdr)
{
NS_LOG_FUNCTION(this << trigger << hdr);
if (trigger.IsBsrp() && EmlsrClientCannotRespondToIcf())
{
return;
}
HeFrameExchangeManager::SendQosNullFramesInTbPpdu(trigger, hdr);
}
void
EhtFrameExchangeManager::CtsAfterMuRtsTimeout(Ptr<WifiMpdu> muRts, const WifiTxVector& txVector)
{

7
src/wifi/model/eht/eht-frame-exchange-manager.h
View File

@@ -200,6 +200,13 @@ class EhtFrameExchangeManager : public HeFrameExchangeManager
void SendCtsAfterRts(const WifiMacHeader& rtsHdr, WifiMode rtsTxMode, double rtsSnr) override;
void PsduRxError(Ptr<const WifiPsdu> psdu) override;
void ReceivedQosNullAfterBsrpTf(Mac48Address sender) override;
void SendQosNullFramesInTbPpdu(const CtrlTriggerHeader& trigger,
const WifiMacHeader& hdr) override;
/**
* \return whether this is an EMLSR client that cannot respond to an ICF received a SIFS before
*/
bool EmlsrClientCannotRespondToIcf() const;
private:
/**

3
src/wifi/model/he/he-frame-exchange-manager.h
View File

@@ -340,7 +340,8 @@ class HeFrameExchangeManager : public VhtFrameExchangeManager
* \param trigger the Basic or BSRP Trigger Frame content
* \param hdr the MAC header of the Basic or BSRP Trigger Frame
*/
void SendQosNullFramesInTbPpdu(const CtrlTriggerHeader& trigger, const WifiMacHeader& hdr);
virtual void SendQosNullFramesInTbPpdu(const CtrlTriggerHeader& trigger,
const WifiMacHeader& hdr);
/**
* Perform the actions required when receiving QoS Null frame(s) from the given sender after