multi-user-scheduler.h

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/*
 * Copyright (c) 2020 Universita' degli Studi di Napoli Federico II
 *
 * 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: Stefano Avallone <stavallo@unina.it>
 */
 
#ifndef MULTI_USER_SCHEDULER_H
#define MULTI_USER_SCHEDULER_H
 
#include "he-ru.h"
 
#include "ns3/ap-wifi-mac.h"
#include "ns3/ctrl-headers.h"
#include "ns3/object.h"
#include "ns3/wifi-remote-station-manager.h"
#include "ns3/wifi-tx-parameters.h"
 
#include <unordered_map>
 
namespace ns3
{
 
class HeFrameExchangeManager;
 
typedef std::unordered_map<uint16_t /* staId */, Ptr<WifiPsdu> /* PSDU */> WifiPsduMap;
 
class MultiUserScheduler : public Object
{
  public:
    static TypeId GetTypeId();
    MultiUserScheduler();
    ~MultiUserScheduler() override;
 
    enum TxFormat
    {
        NO_TX = 0,
        SU_TX,
        DL_MU_TX,
        UL_MU_TX
    };
 
    struct DlMuInfo
    {
        WifiPsduMap psduMap;       
        WifiTxParameters txParams; 
    };
 
    struct UlMuInfo
    {
        CtrlTriggerHeader trigger; 
        WifiMacHeader macHdr;      
        WifiTxParameters txParams; 
    };
 
    TxFormat NotifyAccessGranted(Ptr<QosTxop> edca,
                                 Time availableTime,
                                 bool initialFrame,
                                 uint16_t allowedWidth);
 
    DlMuInfo& GetDlMuInfo();
 
    UlMuInfo& GetUlMuInfo();
 
  protected:
    Ptr<WifiRemoteStationManager> GetWifiRemoteStationManager() const;
 
    Ptr<WifiMpdu> GetTriggerFrame(const CtrlTriggerHeader& trigger) const;
 
    TxFormat GetLastTxFormat() const;
 
    uint32_t GetMaxSizeOfQosNullAmpdu(const CtrlTriggerHeader& trigger) const;
 
    void DoDispose() override;
    void NotifyNewAggregate() override;
    void DoInitialize() override;
 
    Ptr<ApWifiMac> m_apMac;              
    Ptr<HeFrameExchangeManager> m_heFem; 
    Ptr<QosTxop> m_edca;                 
    Time m_availableTime;                
    bool m_initialFrame;                 
    uint16_t m_allowedWidth;             
 
  private:
    void SetWifiMac(Ptr<ApWifiMac> mac);
 
    void AccessReqTimeout();
 
    virtual TxFormat SelectTxFormat() = 0;
 
    virtual DlMuInfo ComputeDlMuInfo() = 0;
 
    virtual UlMuInfo ComputeUlMuInfo() = 0;
 
    void CheckTriggerFrame();
 
    TxFormat m_lastTxFormat{NO_TX}; 
    DlMuInfo m_dlInfo;              
    UlMuInfo m_ulInfo;              
    EventId m_accessReqTimer;       
    Time m_accessReqInterval;       
    AcIndex m_accessReqAc;          
    bool m_restartTimerUponAccess;  
};
 
} // namespace ns3
 
#endif /* MULTI_USER_SCHEDULER_H */