diff --git a/src/wifi/CMakeLists.txt b/src/wifi/CMakeLists.txt
index b7e1ed87f..edd3689b5 100644
--- a/src/wifi/CMakeLists.txt
+++ b/src/wifi/CMakeLists.txt
@@ -12,6 +12,7 @@ set(source_files
     helper/wifi-mac-helper.cc
     helper/wifi-radio-energy-model-helper.cc
     helper/yans-wifi-helper.cc
+    model/addba-extension.cc
     model/adhoc-wifi-mac.cc
     model/ampdu-subframe-header.cc
     model/ampdu-tag.cc
@@ -164,6 +165,7 @@ set(header_files
     helper/wifi-mac-helper.h
     helper/wifi-radio-energy-model-helper.h
     helper/yans-wifi-helper.h
+    model/addba-extension.h
     model/adhoc-wifi-mac.h
     model/ampdu-subframe-header.h
     model/ampdu-tag.h
diff --git a/src/wifi/model/addba-extension.cc b/src/wifi/model/addba-extension.cc
new file mode 100644
index 000000000..5e505d8f2
--- /dev/null
+++ b/src/wifi/model/addba-extension.cc
@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) 2023 Universita' degli Studi di Napoli Federico II
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation;
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * Author: Stefano Avallone <stavallo@unina.it>
+ */
+
+#include "addba-extension.h"
+
+namespace ns3
+{
+
+void
+AddbaExtension::Print(std::ostream& os) const
+{
+    os << "extBufferSize=" << +m_extParamSet.extBufferSize;
+}
+
+WifiInformationElementId
+AddbaExtension::ElementId() const
+{
+    return IE_ADDBA_EXTENSION;
+}
+
+uint16_t
+AddbaExtension::GetInformationFieldSize() const
+{
+    return 1U; // ADDBA Extended Parameter Set field
+}
+
+void
+AddbaExtension::SerializeInformationField(Buffer::Iterator start) const
+{
+    uint8_t extParamSet = m_extParamSet.noFragment | (m_extParamSet.heFragmentOp << 1) |
+                          (m_extParamSet.extBufferSize << 5);
+    start.WriteU8(extParamSet);
+}
+
+uint16_t
+AddbaExtension::DeserializeInformationField(Buffer::Iterator start, uint16_t length)
+{
+    auto extParamSet = start.ReadU8();
+    m_extParamSet.noFragment = extParamSet & 0x01;
+    m_extParamSet.heFragmentOp = (extParamSet >> 1) & 0x03;
+    m_extParamSet.extBufferSize = (extParamSet >> 5) & 0x07;
+    return 1;
+}
+
+} // namespace ns3
diff --git a/src/wifi/model/addba-extension.h b/src/wifi/model/addba-extension.h
new file mode 100644
index 000000000..6975def7c
--- /dev/null
+++ b/src/wifi/model/addba-extension.h
@@ -0,0 +1,63 @@
+/*
+ * Copyright (c) 2023 Universita' degli Studi di Napoli Federico II
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation;
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * Author: Stefano Avallone <stavallo@unina.it>
+ */
+
+#ifndef ADDBA_EXTENSION_H
+#define ADDBA_EXTENSION_H
+
+#include "wifi-information-element.h"
+
+namespace ns3
+{
+
+/**
+ * \ingroup wifi
+ *
+ * The IEEE 802.11 ADDBA Extension Element (Sec. 9.4.2.139 of 802.11-2020)
+ */
+class AddbaExtension : public WifiInformationElement
+{
+  public:
+    AddbaExtension() = default;
+
+    /**
+     * ADDBA Extended Parameter Set
+     */
+    struct ExtParamSet
+    {
+        uint8_t noFragment : 1;    //!< reserved when transmitted by HE STA to HE STA
+        uint8_t heFragmentOp : 2;  //!< indicates level of HE dynamic fragmentation (unsupported)
+        uint8_t : 2;               //!< reserved
+        uint8_t extBufferSize : 3; //!< extended buffer size
+    };
+
+    // Implementations of pure virtual methods of WifiInformationElement
+    WifiInformationElementId ElementId() const override;
+    void Print(std::ostream& os) const override;
+
+    ExtParamSet m_extParamSet{}; //!< ADDBA Extended Parameter Set field
+
+  private:
+    uint16_t GetInformationFieldSize() const override;
+    void SerializeInformationField(Buffer::Iterator start) const override;
+    uint16_t DeserializeInformationField(Buffer::Iterator start, uint16_t length) override;
+};
+
+} // namespace ns3
+
+#endif /* ADDBA_EXTENSION_H */