qos-txop.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 QOS_TXOP_H
#define QOS_TXOP_H

#include "ns3/traced-value.h"
#include "block-ack-manager.h"
#include "txop.h"
#include "qos-utils.h"

class AmpduAggregationTest;

namespace ns3 {

class QosBlockedDestinations;
class MsduAggregator;
class MpduAggregator;
class MgtAddBaResponseHeader;
class MgtDelBaHeader;
class AggregationCapableTransmissionListener;

enum TypeOfStation
{
  STA,
  AP,
  ADHOC_STA,
  MESH,
  HT_STA,
  HT_AP,
  HT_ADHOC_STA,
  OCB
};

class QosTxop : public Txop
{
public:
  friend class ::AmpduAggregationTest;

  std::map<Mac48Address, bool> m_aMpduEnabled; 

  static TypeId GetTypeId (void);

  QosTxop ();
  virtual ~QosTxop ();

  bool IsQosTxop () const;

  void SetWifiRemoteStationManager (const Ptr<WifiRemoteStationManager> remoteManager);
  void SetTypeOfStation (TypeOfStation type);
  TypeOfStation GetTypeOfStation (void) const;

  Ptr<MsduAggregator> GetMsduAggregator (void) const;
  Ptr<MpduAggregator> GetMpduAggregator (void) const;

  bool GetBaAgreementExists (Mac48Address address, uint8_t tid) const;
  void CompleteAmpduTransfer (Mac48Address recipient, uint8_t tid);

  /* dcf notifications forwarded here */
  void NotifyAccessGranted (void);
  void NotifyInternalCollision (void);
  void NotifyCollision (void);

  /* Event handlers */
  void MissedCts (void);
  void GotAck (void);
  void GotBlockAck (const CtrlBAckResponseHeader *blockAck, Mac48Address recipient, double rxSnr, WifiMode txMode, double dataSnr);
  void MissedBlockAck (uint8_t nMpdus);
  void GotAddBaResponse (const MgtAddBaResponseHeader *respHdr, Mac48Address recipient);
  void GotDelBaFrame (const MgtDelBaHeader *delBaHdr, Mac48Address recipient);
  void MissedAck (void);

  void StartNextPacket (void);
  void EndTxNoAck (void);
  void RestartAccessIfNeeded (void);
  void StartAccessIfNeeded (void);

  bool NeedBarRetransmission (void);

  bool NeedFragmentation (void) const;

  Ptr<Packet> GetFragmentPacket (WifiMacHeader *hdr);

  void SetAccessCategory (AcIndex ac);

  void SetMsduAggregator (const Ptr<MsduAggregator> aggr);
  void SetMpduAggregator (const Ptr<MpduAggregator> aggr);

  void PushFront (Ptr<const Packet> packet, const WifiMacHeader &hdr);

  void CompleteConfig (void);

  void SetBlockAckThreshold (uint8_t threshold);
  uint8_t GetBlockAckThreshold (void) const;

  void SetBlockAckInactivityTimeout (uint16_t timeout);
  void SendDelbaFrame (Mac48Address addr, uint8_t tid, bool byOriginator);
  void CompleteMpduTx (Ptr<const Packet> packet, WifiMacHeader hdr, Time tstamp);
  bool GetAmpduExist (Mac48Address dest) const;
  void SetAmpduExist (Mac48Address dest, bool enableAmpdu);

  uint16_t GetNextSequenceNumberFor (WifiMacHeader *hdr);
  uint16_t PeekNextSequenceNumberFor (WifiMacHeader *hdr);
  void RemoveRetransmitPacket (uint8_t tid, Mac48Address recipient, uint16_t seqnumber);
  Ptr<const Packet> PeekNextRetransmitPacket (WifiMacHeader &header, uint8_t tid, Time *timestamp);
  void BaTxOk (const WifiMacHeader &hdr);
  void BaTxFailed (const WifiMacHeader &hdr);

  Mac48Address MapSrcAddressForAggregation (const WifiMacHeader &hdr);
  Mac48Address MapDestAddressForAggregation (const WifiMacHeader &hdr);


private:
  friend class AggregationCapableTransmissionListener;

  bool SetupBlockAckIfNeeded ();
  void SendAddBaRequest (Mac48Address recipient, uint8_t tid, uint16_t startSeq,
                         uint16_t timeout, bool immediateBAck);
  void SendBlockAckRequest (const Bar &bar);
  void CompleteTx (void);
  void VerifyBlockAck (void);
  Time GetTxopRemaining (void) const;
  bool HasTxop (void) const;

  uint32_t GetNextFragmentSize (void) const;
  uint32_t GetFragmentSize (void) const;
  uint32_t GetFragmentOffset (void) const;
  bool IsLastFragment (void) const;

  bool IsTxopFragmentation () const;
  uint32_t GetTxopFragmentSize () const;
  uint32_t GetNTxopFragment () const;
  uint32_t GetNextTxopFragmentSize (uint32_t fragmentNumber) const;
  uint32_t GetTxopFragmentOffset (uint32_t fragmentNumber) const;

  void DoDispose (void);
  void DoInitialize (void);

  AcIndex m_ac;                                     
  Ptr<MsduAggregator> m_msduAggregator;             
  Ptr<MpduAggregator> m_mpduAggregator;             
  TypeOfStation m_typeOfStation;                    
  Ptr<QosBlockedDestinations> m_qosBlockedDestinations; 
  Ptr<BlockAckManager> m_baManager;                     
  uint8_t m_blockAckThreshold;                      
  BlockAckType m_blockAckType;                      
  Time m_currentPacketTimestamp;                    
  uint16_t m_blockAckInactivityTimeout;             
  Bar m_currentBar;                                 
  Time m_startTxop;                                 
  bool m_isAccessRequestedForRts;                   
  bool m_currentIsFragmented;                       

  TracedValue<uint32_t> m_backoffTrace;   
  TracedValue<uint32_t> m_cwTrace;        
  TracedCallback<Time, Time> m_txopTrace; 
};

} //namespace ns3

#endif /* QOS_TXOP_H */