--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/devices/wifi/mac-tx-middle.cc	Tue Oct 09 12:23:14 2007 +0200
@@ -0,0 +1,59 @@
+/* -*-  Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2005 INRIA
+ *
+ * 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: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
+ */
+
+#include <cassert>
+
+#include "mac-tx-middle.h"
+#include "wifi-mac-header.h"
+
+namespace ns3 {
+
+MacTxMiddle::MacTxMiddle ()
+{
+  m_sequence = 0;
+  for (uint8_t i = 0; i < 16; i++) 
+    {
+      m_qosSequences[i] = 0;
+    }
+}
+
+uint16_t 
+MacTxMiddle::GetNextSequenceNumberfor (const WifiMacHeader *hdr)
+{
+  uint16_t retval;
+  if (hdr->IsQosData () &&
+      !hdr->GetAddr1 ().IsBroadcast ()) 
+    {
+      uint8_t tid = hdr->GetQosTid ();
+      assert (tid < 16);
+      retval = m_qosSequences[tid];
+      m_qosSequences[tid]++;
+      m_qosSequences[tid] %= 4096;
+    } 
+  else 
+    {
+      retval = m_sequence;
+      m_sequence++;
+      m_sequence %= 4096;
+    }
+  return retval;
+}
+
+}; // namespace ns3

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/devices/wifi/mac-tx-middle.h	Tue Oct 09 12:23:14 2007 +0200
@@ -0,0 +1,43 @@
+/* -*-  Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2005 INRIA
+ *
+ * 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: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
+ */
+
+#ifndef MAC_TX_MIDDLE_H
+#define MAC_TX_MIDDLE_H
+
+#include <stdint.h>
+
+namespace ns3 {
+
+class WifiMacHeader;
+
+class MacTxMiddle {
+public:
+  MacTxMiddle ();
+
+  uint16_t GetNextSequenceNumberfor (const WifiMacHeader *hdr);
+
+private:
+  uint16_t m_qosSequences[16];
+  uint16_t m_sequence;
+};
+
+} // namespace ns3
+
+#endif /* MAC_TX_MIDDLE_H */

--- a/src/devices/wifi/wscript	Tue Oct 09 12:20:43 2007 +0200
+++ b/src/devices/wifi/wscript	Tue Oct 09 12:23:14 2007 +0200
@@ -18,7 +18,8 @@
         'mac-parameters.cc',
         'mac-low.cc',
         'dcf.cc',
-        'wifi-mac-queue.cc'
+        'wifi-mac-queue.cc',
+        'mac-tx-middle.cc',
         ]
     headers = bld.create_obj('ns3header')
     headers.source = [