lte-rlc-um.h

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/*
 * Copyright (c) 2011 Centre Tecnologic de Telecomunicacions de Catalunya (CTTC)
 *
 * 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: Manuel Requena <manuel.requena@cttc.es>
 */
 
#ifndef LTE_RLC_UM_H
#define LTE_RLC_UM_H
 
#include "lte-rlc-sequence-number.h"
#include "lte-rlc.h"
 
#include <ns3/event-id.h>
 
#include <map>
 
namespace ns3
{
 
class LteRlcUm : public LteRlc
{
  public:
    LteRlcUm();
    ~LteRlcUm() override;
    static TypeId GetTypeId();
    void DoDispose() override;
 
    void DoTransmitPdcpPdu(Ptr<Packet> p) override;
 
    void DoNotifyTxOpportunity(LteMacSapUser::TxOpportunityParameters txOpParams) override;
    void DoNotifyHarqDeliveryFailure() override;
    void DoReceivePdu(LteMacSapUser::ReceivePduParameters rxPduParams) override;
 
  private:
    void ExpireReorderingTimer();
    void ExpireRbsTimer();
 
    bool IsInsideReorderingWindow(SequenceNumber10 seqNumber);
 
    void ReassembleOutsideWindow();
    void ReassembleSnInterval(SequenceNumber10 lowSeqNumber, SequenceNumber10 highSeqNumber);
 
    void ReassembleAndDeliver(Ptr<Packet> packet);
 
    void DoReportBufferStatus();
 
  private:
    uint32_t m_maxTxBufferSize; 
    uint32_t m_txBufferSize;    
 
    struct TxPdu
    {
        TxPdu(const Ptr<Packet>& pdu, const Time& time)
            : m_pdu(pdu),
              m_waitingSince(time)
        {
        }
 
        TxPdu() = delete;
 
        Ptr<Packet> m_pdu;   
        Time m_waitingSince; 
    };
 
    std::vector<TxPdu> m_txBuffer;              
    std::map<uint16_t, Ptr<Packet>> m_rxBuffer; 
    std::vector<Ptr<Packet>> m_reasBuffer;      
 
    std::list<Ptr<Packet>> m_sdusBuffer; 
 
    SequenceNumber10 m_sequenceNumber; 
 
    SequenceNumber10 m_vrUr; 
    SequenceNumber10 m_vrUx; 
    SequenceNumber10 m_vrUh; 
 
    uint16_t m_windowSize; 
 
    Time m_reorderingTimerValue;        
    EventId m_reorderingTimer;          
    EventId m_rbsTimer;                 
    bool m_enablePdcpDiscarding{false}; 
    uint32_t m_discardTimerMs{0};       
 
    enum ReassemblingState_t
    {
        NONE = 0,
        WAITING_S0_FULL = 1,
        WAITING_SI_SF = 2
    };
 
    ReassemblingState_t m_reassemblingState; 
    Ptr<Packet> m_keepS0;                    
 
    SequenceNumber10 m_expectedSeqNumber;
};
 
} // namespace ns3
 
#endif // LTE_RLC_UM_H