/* -*-  Mode: C++; c-file-style: "gnu"; indent-tabs-mode:nil; -*- */

/*

 * Copyright (c) 2005,2006 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: Federico Maguolo <maguolof@dei.unipd.it>

 */

#ifndef AARFCD_WIFI_MANAGER_H

#define AARFCD_WIFI_MANAGER_H

#include "wifi-remote-station-manager.h"

namespace ns3 {

class AarfcdWifiRemoteStation;

/**

 * \brief an implementation of the AARF-CD algorithm

 *

 * This algorithm was first described in "Efficient Collision Detection for Auto Rate Fallback Algorithm".

 * The implementation available here was done by Federico Maguolo for a very early development

 * version of ns-3. Federico died before merging this work in ns-3 itself so his code was ported

 * to ns-3 later without his supervision.

 */

class AarfcdWifiManager : public WifiRemoteStationManager 

{

public:

  static TypeId GetTypeId (void);

  AarfcdWifiManager ();

  virtual ~AarfcdWifiManager ();

private:

  // overriden from base class

  virtual void DoReportRxOk (WifiRemoteStation *station, 

                             double rxSnr, WifiMode txMode);

  virtual void DoReportRtsFailed (WifiRemoteStation *station);

  virtual void DoReportDataFailed (WifiRemoteStation *station);

  virtual void DoReportRtsOk (WifiRemoteStation *station,

                              double ctsSnr, WifiMode ctsMode, double rtsSnr);

  virtual void DoReportDataOk (WifiRemoteStation *station,

                               double ackSnr, WifiMode ackMode, double dataSnr);

  virtual void DoReportFinalRtsFailed (WifiRemoteStation *station);

  virtual void DoReportFinalDataFailed (WifiRemoteStation *station);

  virtual WifiMode DoGetDataMode (WifiRemoteStation *station, uint32_t size);

  virtual WifiMode DoGetRtsMode (WifiRemoteStation *station);

  virtual bool DoNeedRts (WifiRemoteStation *station, 

                          Ptr<const Packet> packet, bool normally);

  virtual bool IsLowLatency (void) const;

  void CheckRts (AarfcdWifiRemoteStation *station);

  void IncreaseRtsWnd (AarfcdWifiRemoteStation *station);

  void ResetRtsWnd (AarfcdWifiRemoteStation *station);

  void TurnOffRts (AarfcdWifiRemoteStation *station);

  void TurnOnRts (AarfcdWifiRemoteStation *station);

  // aarf fields below

  uint32_t m_minTimerThreshold;

  uint32_t m_minSuccessThreshold;

  double m_successK;

  uint32_t m_maxSuccessThreshold;

  double m_timerK;

  // aarf-cd fields below

  uint32_t m_minRtsWnd;

  uint32_t m_maxRtsWnd;

  bool m_rtsFailsAsDataFails;

  bool m_turnOffRtsAfterRateDecrease;

  bool m_turnOnRtsAfterRateIncrease;

};

} // namespace ns3

#endif /* AARFCD_WIFI_MANAGER_H */