/* -*-  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_MAC_STATIONS_H

#define IDEAL_MAC_STATIONS_H

#include <stdint.h>

#include <vector>

#include "mac-stations.h"

#include "wifi-mode.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 IdealMacStations : public MacStations {

public:

  IdealMacStations (WifiMode defaultTxMode);

  virtual ~IdealMacStations ();

  WifiMode GetMode (double snr) 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);

private:

  virtual class MacStation *CreateStation (void);

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

  Thresholds m_thresholds;

  double m_minSnr;

  double m_maxSnr;

};

class IdealMacStation : public MacStation 

{

public:

  IdealMacStation (IdealMacStations *stations);

  virtual ~IdealMacStation ();

  virtual void ReportRxOk (double rxSnr, WifiMode txMode);

  virtual void ReportRtsFailed (void);

  virtual void ReportDataFailed (void);

  virtual void ReportRtsOk (double ctsSnr, WifiMode ctsMode, double rtsSnr);

  virtual void ReportDataOk (double ackSnr, WifiMode ackMode, double dataSnr);

private:

  virtual IdealMacStations *GetStations (void) const;

  IdealMacStations *m_stations;

  double m_lastSnr;

};

} // namespace ns3

#endif /* MAC_STA_H */