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

/*

 * Copyright (c) 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: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>

 */

#ifndef IDEAL_WIFI_MANAGER_H

#define IDEAL_WIFI_MANAGER_H

#include <stdint.h>

#include <vector>

#include "wifi-mode.h"

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

namespace ns3 {

/**

 * \brief Ideal rate control algorithm

 *

 * This class implements an 'ideal' rate control algorithm

 * similar to RBAR in spirit (see <i>A rate-adaptive MAC

 * protocol for multihop wireless networks</i> by G. Holland,

 * N. Vaidya, and P. Bahl.): every station keeps track of the

 * snr of every packet received and sends back this snr to the

 * original transmitter by an out-of-band mechanism. Each 

 * transmitter keeps track of the last snr sent back by a receiver

 * and uses it to pick a transmission mode based on a set

 * of snr thresholds built from a target ber and transmission 

 * mode-specific snr/ber curves.

 */

class IdealWifiManager : public WifiRemoteStationManager 

{

public:

  static TypeId GetTypeId (void);

  IdealWifiManager ();

  virtual ~IdealWifiManager ();

  virtual void SetupPhy (Ptr<WifiPhy> phy);

private:

  // overriden from base class

  virtual WifiRemoteStation *DoCreateStation (void) const;

  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 IsLowLatency (void) const;

  // return the min snr needed to successfully transmit

  // data with this mode at the specified ber.

  double GetSnrThreshold (WifiMode mode) const;

  void AddModeSnrThreshold (WifiMode mode, double ber);

  typedef std::vector<std::pair<double,WifiMode> > Thresholds;

  double m_ber;

  Thresholds m_thresholds;

  double m_minSnr;

  double m_maxSnr;

};

} // namespace ns3

#endif /* IDEAL_WIFI_MANAGER_H */