qos-txop.h

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/*
 * 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 "block-ack-manager.h"
#include "qos-utils.h"
#include "txop.h"
 
#include "ns3/traced-value.h"
 
namespace ns3
{
 
class QosBlockedDestinations;
class MgtAddBaResponseHeader;
class MgtDelBaHeader;
class AggregationCapableTransmissionListener;
class WifiTxVector;
class QosFrameExchangeManager;
class WifiTxParameters;
 
class QosTxop : public Txop
{
  public:
    static TypeId GetTypeId();
 
    QosTxop(AcIndex ac = AC_UNDEF);
 
    ~QosTxop() override;
 
    bool IsQosTxop() const override;
    bool HasFramesToTransmit(uint8_t linkId) override;
    void NotifyChannelAccessed(uint8_t linkId, Time txopDuration) override;
    void NotifyChannelReleased(uint8_t linkId) override;
    void SetDroppedMpduCallback(DroppedMpdu callback) override;
 
    AcIndex GetAccessCategory() const;
 
    bool UseExplicitBarAfterMissedBlockAck() const;
 
    Ptr<BlockAckManager> GetBaManager();
    bool GetBaAgreementEstablished(Mac48Address address, uint8_t tid) const;
    uint16_t GetBaBufferSize(Mac48Address address, uint8_t tid) const;
    uint16_t GetBaStartingSequence(Mac48Address address, uint8_t tid) const;
    BlockAckReqType GetBlockAckReqType(Mac48Address recipient, uint8_t tid) const;
    BlockAckType GetBlockAckType(Mac48Address recipient, uint8_t tid) const;
    Ptr<const WifiMpdu> PrepareBlockAckRequest(Mac48Address recipient, uint8_t tid) const;
    void ScheduleBar(Ptr<const WifiMpdu> bar, bool skipIfNoDataQueued = false);
 
    /* Event handlers */
    void GotAddBaResponse(const MgtAddBaResponseHeader* respHdr, Mac48Address recipient);
    void GotDelBaFrame(const MgtDelBaHeader* delBaHdr, Mac48Address recipient);
    void AddBaResponseTimeout(Mac48Address recipient, uint8_t tid);
    void ResetBa(Mac48Address recipient, uint8_t tid);
 
    void SetBlockAckThreshold(uint8_t threshold);
    uint8_t GetBlockAckThreshold() const;
 
    void SetBlockAckInactivityTimeout(uint16_t timeout);
    uint16_t GetBlockAckInactivityTimeout() const;
    void CompleteMpduTx(Ptr<WifiMpdu> mpdu);
    void SetAddBaResponseTimeout(Time addBaResponseTimeout);
    Time GetAddBaResponseTimeout() const;
    void SetFailedAddBaTimeout(Time failedAddBaTimeout);
    Time GetFailedAddBaTimeout() const;
 
    uint16_t GetNextSequenceNumberFor(const WifiMacHeader* hdr);
    uint16_t PeekNextSequenceNumberFor(const WifiMacHeader* hdr);
    Ptr<WifiMpdu> PeekNextMpdu(uint8_t linkId,
                               uint8_t tid = 8,
                               Mac48Address recipient = Mac48Address::GetBroadcast(),
                               Ptr<WifiMpdu> item = nullptr);
    Ptr<WifiMpdu> GetNextMpdu(uint8_t linkId,
                              Ptr<WifiMpdu> peekedItem,
                              WifiTxParameters& txParams,
                              Time availableTime,
                              bool initialFrame);
 
    void AssignSequenceNumber(Ptr<WifiMpdu> mpdu) const;
 
    uint8_t GetQosQueueSize(uint8_t tid, Mac48Address receiver) const;
 
    virtual bool IsTxopStarted(uint8_t linkId) const;
    virtual Time GetRemainingTxop(uint8_t linkId) const;
 
    void SetMuCwMin(uint16_t cwMin, uint8_t linkId);
    void SetMuCwMax(uint16_t cwMax, uint8_t linkId);
    void SetMuAifsn(uint8_t aifsn, uint8_t linkId);
    void SetMuEdcaTimer(Time timer, uint8_t linkId);
    void StartMuEdcaTimerNow(uint8_t linkId);
    bool MuEdcaTimerRunning(uint8_t linkId) const;
    bool EdcaDisabled(uint8_t linkId) const;
    uint32_t GetMinCw(uint8_t linkId) const override;
    uint32_t GetMaxCw(uint8_t linkId) const override;
    uint8_t GetAifsn(uint8_t linkId) const override;
 
  protected:
    struct QosLinkEntity : public Txop::LinkEntity
    {
        ~QosLinkEntity() override = default;
 
        Time startTxop{0};            
        Time txopDuration{0};         
        uint32_t muCwMin{0};          
        uint32_t muCwMax{0};          
        uint8_t muAifsn{0};           
        Time muEdcaTimer{0};          
        Time muEdcaTimerStartTime{0}; 
    };
 
    void DoDispose() override;
 
    QosLinkEntity& GetLink(uint8_t linkId) const;
 
  private:
    friend class AggregationCapableTransmissionListener;
 
    std::unique_ptr<LinkEntity> CreateLinkEntity() const override;
 
    bool IsQosOldPacket(Ptr<const WifiMpdu> mpdu);
 
    AcIndex m_ac;                                         
    Ptr<QosBlockedDestinations> m_qosBlockedDestinations; 
    Ptr<BlockAckManager> m_baManager;                     
    uint8_t m_blockAckThreshold; 
    uint16_t m_blockAckInactivityTimeout; 
    Time m_addBaResponseTimeout;          
    Time m_failedAddBaTimeout;            
    bool m_useExplicitBarAfterMissedBlockAck; 
 
    typedef TracedCallback<Time /* start time */, Time /* duration */, uint8_t /* link ID*/>
        TxopTracedCallback;
 
    TxopTracedCallback m_txopTrace; 
};
 
} // namespace ns3
 
#endif /* QOS_TXOP_H */