edca-txop-n.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 EDCA_TXOP_N_H
#define EDCA_TXOP_N_H

#include "ns3/object.h"
#include "ns3/mac48-address.h"
#include "ns3/packet.h"
#include "ns3/traced-value.h"
#include "wifi-mode.h"
#include "wifi-mac-header.h"
#include "wifi-remote-station-manager.h"
#include "qos-utils.h"
#include "dcf.h"
#include "ctrl-headers.h"
#include "block-ack-manager.h"
#include <map>
#include <list>

class AmpduAggregationTest;

namespace ns3 {

class DcfState;
class DcfManager;
class MacLow;
class MacTxMiddle;
class WifiMac;
class WifiMacParameters;
class WifiMacQueue;
class RandomStream;
class QosBlockedDestinations;
class MsduAggregator;
class MpduAggregator;
class MgtAddBaResponseHeader;
class BlockAckManager;
class MgtDelBaHeader;

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


class EdcaTxopN : public Dcf
{
public:
  // Allow test cases to access private members
  friend class ::AmpduAggregationTest;

  typedef Callback <void, const WifiMacHeader&> TxOk;
  typedef Callback <void, const WifiMacHeader&> TxFailed;
  
  std::map<Mac48Address, bool> m_aMpduEnabled;

  static TypeId GetTypeId (void);
  EdcaTxopN ();
  virtual ~EdcaTxopN ();
  void DoDispose ();

  void SetLow (Ptr<MacLow> low);
  void SetTxMiddle (MacTxMiddle *txMiddle);
  void SetManager (DcfManager *manager);
  void SetTxOkCallback (TxOk callback);
  void SetTxFailedCallback (TxFailed callback);
  void SetWifiRemoteStationManager (Ptr<WifiRemoteStationManager> remoteManager);
  void SetTypeOfStation (enum TypeOfStation type);
  enum TypeOfStation GetTypeOfStation (void) const;
  Ptr<WifiMacQueue > GetEdcaQueue () const;

  virtual void SetMinCw (uint32_t minCw);
  virtual void SetMaxCw (uint32_t maxCw);
  virtual void SetAifsn (uint32_t aifsn);
  virtual void SetTxopLimit (Time txopLimit);
  virtual uint32_t GetMinCw (void) const;
  virtual uint32_t GetMaxCw (void) const;
  virtual uint32_t GetAifsn (void) const;
  virtual Time GetTxopLimit (void) const;

  Ptr<MacLow> Low (void);

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

  bool GetBaAgreementExists (Mac48Address address, uint8_t tid) const;
  uint32_t GetNOutstandingPacketsInBa (Mac48Address address, uint8_t tid);
  uint32_t GetNRetryNeededPackets (Mac48Address recipient, uint8_t tid) const;
  void CompleteAmpduTransfer (Mac48Address recipient, uint8_t tid);

  /* dcf notifications forwarded here */
  bool NeedsAccess (void) const;
  void NotifyAccessGranted (void);
  void NotifyInternalCollision (void);
  void NotifyCollision (void);
  void NotifyChannelSwitching (void);
  void NotifySleep (void);
  void NotifyWakeUp (void);

  /* Event handlers */
  void GotCts (double snr, WifiMode txMode);
  void MissedCts (void);
  void GotAck (double snr, WifiMode txMode);
  void GotBlockAck (const CtrlBAckResponseHeader *blockAck, Mac48Address recipient, double rxSnr, WifiMode txMode, double dataSnr);
  void MissedBlockAck (uint32_t nMpdus);
  void GotAddBaResponse (const MgtAddBaResponseHeader *respHdr, Mac48Address recipient);
  void GotDelBaFrame (const MgtDelBaHeader *delBaHdr, Mac48Address recipient);
  void MissedAck (void);
  void StartNextFragment (void);
  void StartNext (void);
  void Cancel (void);
  void EndTxNoAck (void);
  void RestartAccessIfNeeded (void);
  void StartAccessIfNeeded (void);
  bool NeedRtsRetransmission (Ptr<const Packet> packet, const WifiMacHeader &hdr);
  bool NeedDataRetransmission (Ptr<const Packet> packet, const WifiMacHeader &hdr);
  bool NeedBarRetransmission (void);
  bool NeedFragmentation (void) const;
  uint32_t GetNextFragmentSize (void);
  uint32_t GetFragmentSize (void);
  uint32_t GetFragmentOffset (void);
  bool IsLastFragment (void) const;
  void NextFragment (void);
  Ptr<Packet> GetFragmentPacket (WifiMacHeader *hdr);

  void SetAccessCategory (enum AcIndex ac);

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

  void SetMsduAggregator (Ptr<MsduAggregator> aggr);
  void SetMpduAggregator (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);
  /*
   * Peek in retransmit queue and get the next packet without removing it from the queue
   */
  Ptr<const Packet> PeekNextRetransmitPacket (WifiMacHeader &header, Mac48Address recipient, uint8_t tid, Time *timestamp);
  void BaTxOk (const WifiMacHeader &hdr);
  void BaTxFailed (const WifiMacHeader &hdr);

  int64_t AssignStreams (int64_t stream);


private:
  void DoInitialize ();
  Mac48Address MapSrcAddressForAggregation (const WifiMacHeader &hdr);
  Mac48Address MapDestAddressForAggregation (const WifiMacHeader &hdr);
  EdcaTxopN &operator = (const EdcaTxopN &);
  EdcaTxopN (const EdcaTxopN &);

  bool SetupBlockAckIfNeeded ();
  void SendAddBaRequest (Mac48Address recipient, uint8_t tid, uint16_t startSeq,
                         uint16_t timeout, bool immediateBAck);
  void SendBlockAckRequest (const struct Bar &bar);
  void CompleteTx (void);
  void VerifyBlockAck (void);
  uint8_t GetCurrentTid () const;
  /*
   * Return the remaining duration in the current TXOP.
   *
   * \return the remaining duration in the current TXOP
   */
  Time GetTxopRemaining (void);
  /*
   * Check if the station has TXOP granted for the next MPDU.
   *
   * \return true if the station has TXOP granted for the next MPDU,
   *         false otherwise
   */
  bool HasTxop (void);

  AcIndex m_ac;
  class Dcf;
  class TransmissionListener;
  class AggregationCapableTransmissionListener;
  friend class Dcf;
  friend class TransmissionListener;
  Dcf *m_dcf;
  DcfManager *m_manager;
  Ptr<WifiMacQueue> m_queue;
  TxOk m_txOkCallback;
  TxFailed m_txFailedCallback;
  Ptr<MacLow> m_low;
  MacTxMiddle *m_txMiddle;
  TransmissionListener *m_transmissionListener;
  AggregationCapableTransmissionListener *m_blockAckListener;
  RandomStream *m_rng;
  Ptr<WifiRemoteStationManager> m_stationManager;
  uint8_t m_fragmentNumber;

  /* current packet could be a simple MSDU or, if an aggregator for this queue is
     present, could be an A-MSDU.
   */
  Ptr<const Packet> m_currentPacket;

  WifiMacHeader m_currentHdr;
  Ptr<MsduAggregator> m_msduAggregator;
  Ptr<MpduAggregator> m_mpduAggregator;
  TypeOfStation m_typeOfStation;
  QosBlockedDestinations *m_qosBlockedDestinations;
  BlockAckManager *m_baManager;
  /*
   * Represents the minimum number of packets for use of block ack.
   */
  uint8_t m_blockAckThreshold;
  enum BlockAckType m_blockAckType;
  Time m_currentPacketTimestamp;
  uint16_t m_blockAckInactivityTimeout;
  struct Bar m_currentBar;
  Time m_startTxop;
  bool m_isAccessRequestedForRts;
  TracedValue<uint32_t> m_backoffTrace;
  TracedValue<uint32_t> m_cwTrace;
};

} //namespace ns3

#endif /* EDCA_TXOP_N_H */