wifi: EHT FEM can send EML Operating Mode Notification frames

src/wifi/model/eht/eht-frame-exchange-manager.cc

@@ -23,6 +23,7 @@
 
 #include "ns3/abort.h"
 #include "ns3/log.h"
+#include "ns3/wifi-mac-queue.h"
 
 #undef NS_LOG_APPEND_CONTEXT
 #define NS_LOG_APPEND_CONTEXT std::clog << "[link=" << +m_linkId << "][mac=" << m_self << "] "
@@ -121,6 +122,38 @@ EhtFrameExchangeManager::ForwardPsduDown(Ptr<const WifiPsdu> psdu, WifiTxVector&
     HeFrameExchangeManager::ForwardPsduDown(psdu, txVector);
 }
 
+void
+EhtFrameExchangeManager::SendEmlOperatingModeNotification(
+    const Mac48Address& dest,
+    const MgtEmlOperatingModeNotification& frame)
+{
+    NS_LOG_FUNCTION(this << dest << frame);
+
+    WifiMacHeader hdr;
+    hdr.SetType(WIFI_MAC_MGT_ACTION);
+    hdr.SetAddr1(dest);
+    hdr.SetAddr2(m_self);
+    hdr.SetAddr3(m_bssid);
+    hdr.SetDsNotTo();
+    hdr.SetDsNotFrom();
+
+    // get the sequence number for the TWT Setup management frame
+    const auto sequence = m_txMiddle->GetNextSequenceNumberFor(&hdr);
+    hdr.SetSequenceNumber(sequence);
+
+    WifiActionHeader actionHdr;
+    WifiActionHeader::ActionValue action;
+    action.protectedEhtAction = WifiActionHeader::PROTECTED_EHT_EML_OPERATING_MODE_NOTIFICATION;
+    actionHdr.SetAction(WifiActionHeader::PROTECTED_EHT, action);
+
+    auto packet = Create<Packet>();
+    packet->AddHeader(frame);
+    packet->AddHeader(actionHdr);
+
+    // Use AC_VO to send management frame addressed to a QoS STA (Sec. 10.2.3.2 of 802.11-2020)
+    m_mac->GetQosTxop(AC_VO)->Queue(Create<WifiMpdu>(packet, hdr));
+}
+
 std::optional<double>
 EhtFrameExchangeManager::GetMostRecentRssi(const Mac48Address& address) const
 {

src/wifi/model/eht/eht-frame-exchange-manager.h

@@ -21,6 +21,7 @@
 #define EHT_FRAME_EXCHANGE_MANAGER_H
 
 #include "ns3/he-frame-exchange-manager.h"
+#include "ns3/mgt-headers.h"
 
 namespace ns3
 {
@@ -45,6 +46,15 @@ class EhtFrameExchangeManager : public HeFrameExchangeManager
     void SetLinkId(uint8_t linkId) override;
     Ptr<WifiMpdu> CreateAliasIfNeeded(Ptr<WifiMpdu> mpdu) const override;
 
+    /**
+     * Send an EML Operating Mode Notification frame to the given station.
+     *
+     * \param dest the MAC address of the receiver
+     * \param frame the EML Operating Mode Notification frame to send
+     */
+    void SendEmlOperatingModeNotification(const Mac48Address& dest,
+                                          const MgtEmlOperatingModeNotification& frame);
+
     /**
      * Get the RSSI (in dBm) of the most recent packet received from the station having
      * the given address. If there is no such information for the given station and the