/* -*-  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 RRAA_WIFI_MANAGER_H

#define RRAA_WIFI_MANAGER_H

#include "ns3/nstime.h"

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

namespace ns3 {

struct ThresholdsItem {

  uint32_t datarate;

  double pori;

  double pmtl;

  uint32_t ewnd;

};

typedef std::vector<ThresholdsItem> Thresholds;

/**

 * \brief Robust Rate Adaptation Algorithm

 *

 * This is an implementation of RRAA as described in

 * "Robust rate adaptation for 802.11 wireless networks"

 * by "Starsky H. Y. Wong", "Hao Yang", "Songwu Lu", and,

 * "Vaduvur Bharghavan" published in Mobicom 06.

 */

class RraaWifiManager : public WifiRemoteStationManager 

{

public:

  static TypeId GetTypeId (void);

  RraaWifiManager ();

  virtual ~RraaWifiManager ();

  bool OnlyBasic (void);

  Time GetTimeout (void) const;

  ThresholdsItem GetThresholds (WifiMode mode) const;

private:

  virtual class WifiRemoteStation *CreateStation (void);  

  bool m_basic;

  Time m_timeout;

  uint32_t m_ewndfor54;

  uint32_t m_ewndfor48;

  uint32_t m_ewndfor36;

  uint32_t m_ewndfor24;

  uint32_t m_ewndfor18;

  uint32_t m_ewndfor12;

  uint32_t m_ewndfor9;

  uint32_t m_ewndfor6;

  double m_porifor48;

  double m_porifor36;

  double m_porifor24;

  double m_porifor18;

  double m_porifor12;

  double m_porifor9;

  double m_porifor6;

  double m_pmtlfor54;

  double m_pmtlfor48;

  double m_pmtlfor36;

  double m_pmtlfor24;

  double m_pmtlfor18;

  double m_pmtlfor12;

  double m_pmtlfor9;

};

class RraaWifiRemoteStation : public WifiRemoteStation

{

public:

  RraaWifiRemoteStation (Ptr<RraaWifiManager> stations);

  virtual ~RraaWifiRemoteStation ();

  virtual bool NeedRts (Ptr<const Packet> packet);

private:

  virtual Ptr<WifiRemoteStationManager> GetManager (void) const;

  virtual WifiMode DoGetDataMode (uint32_t size);

  virtual WifiMode DoGetRtsMode (void);

  uint32_t GetMaxRate (void);

  uint32_t GetMinRate (void);

  ThresholdsItem GetThresholds (uint32_t rate);

  void CheckTimeout (void);

  void RunBasicAlgorithm (void);

  void ARts (void);

  void ResetCountersBasic (void);

  uint32_t m_counter;

  uint32_t m_failed;

  uint32_t m_rtsWnd;

  uint32_t m_rtsCounter;

  Time m_lastReset;

  bool m_rtsOn;

  bool m_lastFrameFail;

  bool m_initialized;

  uint32_t m_rate;

  Ptr<RraaWifiManager> m_stations;

};

} // namespace ns3

#endif /* RRAA_WIFI_MANAGER_H */