phy-entity.h

Go to the documentation of this file.

/*
 * Copyright (c) 2020 Orange Labs
 *
 * 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: Rediet <getachew.redieteab@orange.com>
 *          Sébastien Deronne <sebastien.deronne@gmail.com> (for logic ported from wifi-phy and
 * spectrum-wifi-phy) Mathieu Lacage <mathieu.lacage@sophia.inria.fr> (for logic ported from
 * wifi-phy)
 */
 
#ifndef PHY_ENTITY_H
#define PHY_ENTITY_H
 
#include "wifi-mpdu-type.h"
#include "wifi-phy-band.h"
#include "wifi-ppdu.h"
#include "wifi-tx-vector.h"
 
#include "ns3/event-id.h"
#include "ns3/nstime.h"
#include "ns3/simple-ref-count.h"
#include "ns3/wifi-spectrum-value-helper.h"
 
#include <list>
#include <map>
#include <optional>
#include <tuple>
#include <utility>
 
namespace ns3
{
 
struct SignalNoiseDbm
{
    double signal; 
    double noise;  
};
 
struct MpduInfo
{
    MpduType type;          
    uint32_t mpduRefNumber; 
};
 
struct RxSignalInfo
{
    double snr;  
    double rssi; 
};
 
typedef std::map<WifiSpectrumBand, double> RxPowerWattPerChannelBand;
 
class WifiPsdu;
class WifiPhy;
class InterferenceHelper;
class Event;
class WifiPhyStateHelper;
class WifiPsdu;
class WifiPpdu;
 
class PhyEntity : public SimpleRefCount<PhyEntity>
{
  public:
    enum PhyRxFailureAction
    {
        DROP = 0, 
        ABORT,    
        IGNORE    
    };
 
    struct PhyFieldRxStatus
    {
        bool isSuccess{true};                   
        WifiPhyRxfailureReason reason{UNKNOWN}; 
        PhyRxFailureAction actionIfFailure{
            DROP}; 
 
        PhyFieldRxStatus(bool s)
            : isSuccess(s)
        {
        }
 
        PhyFieldRxStatus(bool s, WifiPhyRxfailureReason r, PhyRxFailureAction a)
            : isSuccess(s),
              reason(r),
              actionIfFailure(a)
        {
        }
    };
 
    struct SnrPer
    {
        double snr{0.0}; 
        double per{1.0}; 
 
        SnrPer()
        {
        }
 
        SnrPer(double s, double p)
            : snr(s),
              per(p)
        {
        }
    };
 
    virtual ~PhyEntity();
 
    void SetOwner(Ptr<WifiPhy> wifiPhy);
 
    virtual bool IsModeSupported(WifiMode mode) const;
    virtual uint8_t GetNumModes() const;
 
    virtual WifiMode GetMcs(uint8_t index) const;
    virtual bool IsMcsSupported(uint8_t index) const;
    virtual bool HandlesMcsModes() const;
 
    virtual WifiMode GetSigMode(WifiPpduField field, const WifiTxVector& txVector) const;
 
    std::list<WifiMode>::const_iterator begin() const;
    std::list<WifiMode>::const_iterator end() const;
 
    WifiPpduField GetNextField(WifiPpduField currentField, WifiPreamble preamble) const;
 
    virtual Time GetDuration(WifiPpduField field, const WifiTxVector& txVector) const;
    Time CalculatePhyPreambleAndHeaderDuration(const WifiTxVector& txVector) const;
 
    virtual Time GetPayloadDuration(uint32_t size,
                                    const WifiTxVector& txVector,
                                    WifiPhyBand band,
                                    MpduType mpdutype,
                                    bool incFlag,
                                    uint32_t& totalAmpduSize,
                                    double& totalAmpduNumSymbols,
                                    uint16_t staId) const = 0;
 
    virtual WifiConstPsduMap GetWifiConstPsduMap(Ptr<const WifiPsdu> psdu,
                                                 const WifiTxVector& txVector) const;
 
    virtual uint32_t GetMaxPsduSize() const = 0;
 
    typedef std::pair<std::pair<Time /* start */, Time /* stop */>, WifiMode> PhyHeaderChunkInfo;
    typedef std::map<WifiPpduField, PhyHeaderChunkInfo> PhyHeaderSections;
    PhyHeaderSections GetPhyHeaderSections(const WifiTxVector& txVector, Time ppduStart) const;
 
    virtual Ptr<WifiPpdu> BuildPpdu(const WifiConstPsduMap& psdus,
                                    const WifiTxVector& txVector,
                                    Time ppduDuration);
 
    Time GetDurationUpToField(WifiPpduField field, const WifiTxVector& txVector) const;
    Time GetRemainingDurationAfterField(Ptr<const WifiPpdu> ppdu, WifiPpduField field) const;
 
    virtual Ptr<const WifiPsdu> GetAddressedPsduInPpdu(Ptr<const WifiPpdu> ppdu) const;
 
    virtual void StartReceivePreamble(Ptr<const WifiPpdu> ppdu,
                                      RxPowerWattPerChannelBand& rxPowersW,
                                      Time rxDuration);
    void StartReceiveField(WifiPpduField field, Ptr<Event> event);
    void EndReceiveField(WifiPpduField field, Ptr<Event> event);
 
    void EndReceivePayload(Ptr<Event> event);
 
    void ResetReceive(Ptr<Event> event);
 
    virtual void CancelAllEvents();
    bool NoEndPreambleDetectionEvents() const;
    void CancelRunningEndPreambleDetectionEvents(bool clear = false);
 
    virtual uint16_t GetStaId(const Ptr<const WifiPpdu> ppdu) const;
 
    virtual void SwitchMaybeToCcaBusy(const Ptr<const WifiPpdu> ppdu);
    virtual void NotifyCcaBusy(const Ptr<const WifiPpdu> ppdu,
                               Time duration,
                               WifiChannelListType channelType);
    virtual void StartTx(Ptr<const WifiPpdu> ppdu, const WifiTxVector& txVector);
 
    void Transmit(Time txDuration,
                  Ptr<const WifiPpdu> ppdu,
                  const WifiTxVector& txVector,
                  std::string type);
 
    virtual Time CalculateTxDuration(WifiConstPsduMap psduMap,
                                     const WifiTxVector& txVector,
                                     WifiPhyBand band) const;
    virtual double GetCcaThreshold(const Ptr<const WifiPpdu> ppdu,
                                   WifiChannelListType channelType) const;
 
  protected:
    typedef std::map<WifiPreamble, std::vector<WifiPpduField>> PpduFormats;
 
    typedef std::pair<WifiCodeRate, uint16_t> CodeRateConstellationSizePair;
 
    typedef std::map<std::string, CodeRateConstellationSizePair> ModulationLookupTable;
 
    virtual const PpduFormats& GetPpduFormats() const = 0;
 
    virtual bool DoStartReceiveField(WifiPpduField field, Ptr<Event> event);
    virtual PhyFieldRxStatus DoEndReceiveField(WifiPpduField field, Ptr<Event> event);
 
    virtual Ptr<Event> DoGetEvent(Ptr<const WifiPpdu> ppdu, RxPowerWattPerChannelBand& rxPowersW);
    virtual PhyFieldRxStatus DoEndReceivePreamble(Ptr<Event> event);
    void StartPreambleDetectionPeriod(Ptr<Event> event);
    void EndPreambleDetectionPeriod(Ptr<Event> event);
 
    void StartReceivePayload(Ptr<Event> event);
 
    virtual Time DoStartReceivePayload(Ptr<Event> event);
 
    virtual void DoResetReceive(Ptr<Event> event);
 
    virtual void DoAbortCurrentReception(WifiPhyRxfailureReason reason);
 
    virtual bool IsConfigSupported(Ptr<const WifiPpdu> ppdu) const;
 
    void DropPreambleEvent(Ptr<const WifiPpdu> ppdu, WifiPhyRxfailureReason reason, Time endRx);
 
    void ErasePreambleEvent(Ptr<const WifiPpdu> ppdu, Time rxDuration);
 
    std::pair<bool, SignalNoiseDbm> GetReceptionStatus(Ptr<const WifiPsdu> psdu,
                                                       Ptr<Event> event,
                                                       uint16_t staId,
                                                       Time relativeMpduStart,
                                                       Time mpduDuration);
    void EndOfMpdu(Ptr<Event> event,
                   Ptr<const WifiPsdu> psdu,
                   size_t mpduIndex,
                   Time relativeStart,
                   Time mpduDuration);
 
    void ScheduleEndOfMpdus(Ptr<Event> event);
 
    virtual void RxPayloadSucceeded(Ptr<const WifiPsdu> psdu,
                                    RxSignalInfo rxSignalInfo,
                                    const WifiTxVector& txVector,
                                    uint16_t staId,
                                    const std::vector<bool>& statusPerMpdu);
    virtual void RxPayloadFailed(Ptr<const WifiPsdu> psdu,
                                 double snr,
                                 const WifiTxVector& txVector);
 
    virtual void DoEndReceivePayload(Ptr<const WifiPpdu> ppdu);
 
    virtual std::pair<uint16_t, WifiSpectrumBand> GetChannelWidthAndBand(
        const WifiTxVector& txVector,
        uint16_t staId) const;
 
    void AbortCurrentReception(WifiPhyRxfailureReason reason);
 
    double GetRandomValue() const;
    SnrPer GetPhyHeaderSnrPer(WifiPpduField field, Ptr<Event> event) const;
    double GetRxPowerWForPpdu(Ptr<Event> event) const;
    Ptr<const Event> GetCurrentEvent() const;
    const std::map<std::pair<uint64_t, WifiPreamble>, Ptr<Event>>& GetCurrentPreambleEvents() const;
    void AddPreambleEvent(Ptr<Event> event);
 
    Ptr<Event> CreateInterferenceEvent(Ptr<const WifiPpdu> ppdu,
                                       const WifiTxVector& txVector,
                                       Time duration,
                                       RxPowerWattPerChannelBand& rxPower,
                                       bool isStartOfdmaRxing = false);
    void UpdateInterferenceEvent(Ptr<Event> event, const RxPowerWattPerChannelBand& rxPower);
    void NotifyInterferenceRxEndAndClear(bool reset);
 
    virtual uint64_t ObtainNextUid(const WifiTxVector& txVector);
 
    virtual Ptr<SpectrumValue> GetTxPowerSpectralDensity(double txPowerW,
                                                         Ptr<const WifiPpdu> ppdu,
                                                         const WifiTxVector& txVector) const = 0;
 
    uint16_t GetCenterFrequencyForChannelWidth(const WifiTxVector& txVector) const;
 
    void NotifyPayloadBegin(const WifiTxVector& txVector, const Time& payloadDuration);
 
    WifiSpectrumBand GetPrimaryBand(uint16_t bandWidth) const;
    WifiSpectrumBand GetSecondaryBand(uint16_t bandWidth) const;
 
    virtual uint16_t GetMeasurementChannelWidth(const Ptr<const WifiPpdu> ppdu) const = 0;
 
    virtual uint16_t GetRxChannelWidth(const WifiTxVector& txVector) const;
 
    Time GetDelayUntilCcaEnd(double thresholdDbm, WifiSpectrumBand band);
 
    uint16_t GetGuardBandwidth(uint16_t currentChannelWidth) const;
    std::tuple<double, double, double> GetTxMaskRejectionParams() const;
 
    using CcaIndication =
        std::optional<std::pair<Time, WifiChannelListType>>; 
 
    virtual CcaIndication GetCcaIndication(const Ptr<const WifiPpdu> ppdu);
 
    Ptr<WifiPhy> m_wifiPhy;          
    Ptr<WifiPhyStateHelper> m_state; 
 
    std::list<WifiMode> m_modeList; 
 
    std::vector<EventId> m_endPreambleDetectionEvents; 
    std::vector<EventId> m_endOfMpduEvents; 
 
    std::vector<EventId>
        m_endRxPayloadEvents; 
 
    typedef std::pair<uint64_t /* UID */, uint16_t /* STA-ID */> UidStaIdPair;
 
    std::map<UidStaIdPair, std::vector<bool>>
        m_statusPerMpduMap; 
    std::map<UidStaIdPair, SignalNoiseDbm>
        m_signalNoiseMap; 
 
    static uint64_t m_globalPpduUid; 
};                                   // class PhyEntity
 
std::ostream& operator<<(std::ostream& os, const PhyEntity::PhyRxFailureAction& action);
std::ostream& operator<<(std::ostream& os, const PhyEntity::PhyFieldRxStatus& status);
 
} // namespace ns3
 
#endif /* PHY_ENTITY_H */