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diff --git a/emu-radio/ns3-patch/wifi/model/sta-wifi-mac.h b/emu-radio/ns3-patch/wifi/model/sta-wifi-mac.h
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+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2006, 2009 INRIA
+ * Copyright (c) 2009 MIRKO BANCHI
+ *
+ * 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
+ *
+ * Authors: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
+ *          Mirko Banchi <mk.banchi@gmail.com>
+ */
+#ifndef STA_WIFI_MAC_H
+#define STA_WIFI_MAC_H
+
+#include "regular-wifi-mac.h"
+#include "ns3/event-id.h"
+#include "ns3/packet.h"
+#include "ns3/traced-callback.h"
+#include "supported-rates.h"
+#include "amsdu-subframe-header.h"
+
+//added+++++++++
+#include "ap-info-collection.h"
+
+#define WITH_HYSTERESIS_HANDOVER_TRIGGER 1
+
+namespace ns3  {
+
+class MgtAddBaRequestHeader;
+
+/**
+ * \ingroup wifi
+ *
+ * The Wifi MAC high model for a non-AP STA in a BSS.
+ */
+class StaWifiMac : public RegularWifiMac
+{
+public:
+  static TypeId GetTypeId (void);
+
+  StaWifiMac ();
+  virtual ~StaWifiMac ();
+
+  /**
+   * \param packet the packet to send.
+   * \param to the address to which the packet should be sent.
+   *
+   * The packet should be enqueued in a tx queue, and should be
+   * dequeued as soon as the channel access function determines that
+   * access is granted to this MAC.
+   */
+  virtual void Enqueue (Ptr<const Packet> packet, Mac48Address to);
+
+  /**
+   * \param missed the number of beacons which must be missed
+   * before a new association sequence is started.
+   */
+  void SetMaxMissedBeacons (uint32_t missed);
+  /**
+   * \param timeout
+   *
+   * If no probe response is received within the specified
+   * timeout, the station sends a new probe request.
+   */
+  void SetProbeRequestTimeout (Time timeout);
+  /**
+   * \param timeout
+   *
+   * If no association response is received within the specified
+   * timeout, the station sends a new association request.
+   */
+  void SetAssocRequestTimeout (Time timeout);
+
+  /**
+   * Start an active association sequence immediately.
+   */
+  void StartActiveAssociation (void);
+
+
+private:
+  /**
+   * The current MAC state of the STA.
+   */
+  enum MacState
+  {
+    ASSOCIATED,
+    WAIT_PROBE_RESP,
+    WAIT_ASSOC_RESP,
+    BEACON_MISSED,
+    REFUSED
+  };
+
+  /**
+   * Enable or disable active probing.
+   *
+   * \param enable enable or disable active probing
+   */
+  void SetActiveProbing (bool enable);
+  /**
+   * Return whether active probing is enabled.
+   *
+   * \return true if active probing is enabled, false otherwise
+   */
+  bool GetActiveProbing (void) const;
+
+  virtual void Receive (Ptr<Packet> packet, const WifiMacHeader *hdr);
+
+  /**
+   * Forward a probe request packet to the DCF. The standard is not clear on the correct
+   * queue for management frames if QoS is supported. We always use the DCF.
+   */
+  void SendProbeRequest (void);
+  /**
+   * Forward an association request packet to the DCF. The standard is not clear on the correct
+   * queue for management frames if QoS is supported. We always use the DCF.
+   */
+  void SendAssociationRequest (void);
+  /**
+   * Try to ensure that we are associated with an AP by taking an appropriate action
+   * depending on the current association status.
+   */
+  void TryToEnsureAssociated (void);
+  /**
+   * This method is called after the association timeout occurred. We switch the state to
+   * WAIT_ASSOC_RESP and re-send an association request.
+   */
+  void AssocRequestTimeout (void);
+  /**
+   * This method is called after the probe request timeout occurred. We switch the state to
+   * WAIT_PROBE_RESP and re-send a probe request.
+   */
+  void ProbeRequestTimeout (void);
+  /**
+   * Return whether we are associated with an AP.
+   *
+   * \return true if we are associated with an AP, false otherwise
+   */
+  bool IsAssociated (void) const;
+  /**
+   * Return whether we are waiting for an association response from an AP.
+   *
+   * \return true if we are waiting for an association response from an AP, false otherwise
+   */
+  bool IsWaitAssocResp (void) const;
+  /**
+   * This method is called after we have not received a beacon from the AP
+   */
+  void MissedBeacons (void);
+  /**
+   * Restarts the beacon timer.
+   *
+   * \param delay the delay before the watchdog fires
+   */
+  void RestartBeaconWatchdog (Time delay);
+  /**
+   * Return an instance of SupportedRates that contains all rates that we support
+   * including HT rates.
+   *
+   * \return SupportedRates all rates that we support
+   */
+  SupportedRates GetSupportedRates (void) const;
+  /**
+   * Set the current MAC state.
+   *
+   * \param value the new state
+   */
+  void SetState (enum MacState value);
+  /**
+   * Return the HT capability of the current AP.
+   *
+   * \return the HT capability that we support
+   */
+  HtCapabilities GetHtCapabilities (void) const;
+  /**
+   * Return the VHT capability of the current AP.
+   *
+   * \return the VHT capability that we support
+   */
+  VhtCapabilities GetVhtCapabilities (void) const;
+
+  enum MacState m_state;
+  Time m_probeRequestTimeout;
+  Time m_assocRequestTimeout;
+  EventId m_probeRequestEvent;
+  EventId m_assocRequestEvent;
+  EventId m_beaconWatchdog;
+  Time m_beaconWatchdogEnd;
+  uint32_t m_maxMissedBeacons;
+  bool m_activeProbing;
+
+  TracedCallback<Mac48Address> m_assocLogger;
+  TracedCallback<Mac48Address> m_deAssocLogger;
+  
+  //********for selecting AP********
+  bool m_isSelectingAP;
+  double m_currentRssi;
+  int m_packetCounts;
+  Time m_delayFromProbResp;
+
+  ApInfoCollection m_apInfos;
+  int m_probeRequestCount;
+
+  bool m_isEverAssoicated;
+  void sendBurstOfProbeRequest();
+  EventId m_probeRequestBurstEvent;
+  EventId m_initialEvent;
+  
+  void loadSupportedRatesOfAp(SupportedRates rates, Mac48Address bssid);
+  
+  void cleanUpPacketsAndAgreementsWithOldAp();
+  
+  void sendDissassociationRequest();
+  //******************************
+
+#ifdef WITH_HYSTERESIS_HANDOVER_TRIGGER
+  //for triggering wifi handover
+  RssiMeasureInfo m_currentApRrssiMeasures;
+  RssiMeasureInfoCollection m_candidadteApRssiMeasures;
+
+  EventId m_sendAssocReqEvent;
+
+#endif
+  
+};
+
+} //namespace ns3
+
+#endif /* STA_WIFI_MAC_H */