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wifi: Do not start MSD timer on a link if no PHY is operating on it

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This commit is contained in:
Stefano Avallone
2024-06-22 17:27:49 +02:00
parent 5243ae5edb
commit dd216804e2
1 changed files with 10 additions and 5 deletions
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15
src/wifi/model/eht/emlsr-manager.cc
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@@ -713,16 +713,21 @@ EmlsrManager::StartMediumSyncDelayTimer(uint8_t linkId)
return;
}
auto phy = m_staMac->GetWifiPhy(linkId);
if (!phy)
{
NS_LOG_DEBUG("No PHY operating on link " << +linkId);
// MSD timer will be started when a PHY will be operating on this link
return;
}
const auto [it, inserted] = m_mediumSyncDelayStatus.try_emplace(linkId);
// reset the max number of TXOP attempts
it->second.msdNTxopsLeft = m_msdMaxNTxops;
// there are cases in which no PHY is operating on a link; e.g., the main PHY starts
// switching to a link on which an aux PHY gained a TXOP and sent an RTS, but the CTS
// is not received and the UL TXOP ends before the main PHY channel switch is
// completed. The MSD timer is started on the link left "uncovered" by the main PHY
if (auto phy = m_staMac->GetWifiPhy(linkId); phy && !it->second.timer.IsPending())
if (!it->second.timer.IsPending())
{
NS_LOG_DEBUG("Setting CCA ED threshold on link "
<< +linkId << " to " << +m_msdOfdmEdThreshold << " PHY " << phy);