19#include "ns3/he-ppdu.h"
21#include "ns3/packet.h"
22#include "ns3/simulator.h"
78 [](
const auto& p1,
const auto& p2) { return p1.second < p2.second; });
103 auto band = currentRxPowerW.first;
104 auto it = rxPower.find(band);
105 if (it != rxPower.end())
107 currentRxPowerW.second += it->second;
121 os <<
"start=" <<
event.GetStartTime() <<
", end=" <<
event.GetEndTime()
122 <<
", power=" <<
event.GetRxPower() <<
"W"
123 <<
", PPDU=" <<
event.GetPpdu();
177 .SetGroupName(
"Wifi")
200 bool isStartHePortionRxing)
203 AppendEvent(event, freqRange, isStartHePortionRxing);
220 Add(fakePpdu, duration, rxPowerW, freqRange);
242 auto result =
m_niChanges.insert({band, niChanges});
266 std::vector<WifiSpectrumBandInfo> bandsToRemove{};
273 const auto frequencies = it->first.frequencies;
275 std::find_if(bands.cbegin(), bands.cend(), [frequencies](
const auto& item) {
276 return frequencies == item.frequencies;
277 }) != std::end(bands);
281 bandsToRemove.emplace_back(it->first);
284 for (
const auto& band : bandsToRemove)
288 for (
const auto& band : bands)
331 for (; i != niIt->second.end(); ++i)
333 const auto noiseInterference = i->second.GetPower();
335 if (noiseInterference <
energy)
340 return end > now ? end - now :
Time{0};
346 bool isStartHePortionRxing)
349 for (
const auto& [band, power] : event->GetRxPowerPerBand())
353 Watt_u previousPowerStart{0.0};
354 Watt_u previousPowerEnd{0.0};
356 previousPowerStart = previousPowerPosition->second.GetPower();
358 if (
const auto rxing = (
m_rxing.contains(freqRange) &&
m_rxing.at(freqRange)); !rxing)
362 niIt->second.erase(++(niIt->second.begin()), ++previousPowerPosition);
364 else if (isStartHePortionRxing)
374 for (
auto i = first; i != last; ++i)
376 i->second.AddPower(power);
386 for (
const auto& [band, power] : rxPower)
392 for (
auto i =
first; i != last; ++i)
394 i->second.AddPower(power);
397 event->UpdateRxPowerW(rxPower);
406 NS_LOG_FUNCTION(
this << signal << noiseInterference << channelWidth << +nss);
408 static const double BOLTZMANN = 1.3803e-23;
410 const auto Nt = BOLTZMANN * 290 *
MHzToHz(channelWidth);
413 Watt_u noise = noiseFloor + noiseInterference;
414 auto snr = signal / noise;
415 NS_LOG_DEBUG(
"bandwidth=" << channelWidth <<
"MHz, signal=" << signal <<
"W, noise="
416 << noiseFloor <<
"W, interference=" << noiseInterference
426 NS_LOG_DEBUG(
"SNR improvement thanks to diversity: " << 10 * std::log10(gain) <<
"dB");
440 auto noiseInterference = firstPower_it->second;
444 auto it = niIt->second.find(event->GetStartTime());
448 for (; it != niIt->second.end() && it->first < now; ++it)
451 (event != it->second.GetEvent()))
457 noiseInterference = it->second.GetPower() -
event->GetRxPower(band) - muMimoPower;
458 if (std::abs(noiseInterference) < std::numeric_limits<double>::epsilon())
461 noiseInterference =
Watt_u{0.0};
464 it = niIt->second.find(event->GetStartTime());
466 for (; it != niIt->second.end() && it->second.GetEvent() != event; ++it)
470 auto& ni = nis[band];
472 while (++it != niIt->second.end() && it->second.GetEvent() != event)
478 "CalculateNoiseInterferenceW returns negative value " << noiseInterference);
479 return noiseInterference;
488 auto it = niIt->second.begin();
491 for (; it != niIt->second.end() && it->first <
Simulator::Now(); ++it)
501 event->GetPpdu()->GetTxVector().GetHeMuUserInfoMap().cbegin()->first;
502 const auto otherStaId = it->second.GetEvent()
505 .GetHeMuUserInfoMap()
508 if (staId == otherStaId)
512 muMimoPower += it->second.GetEvent()->GetRxPower(band);
531 auto nbits =
static_cast<uint64_t
>(rate * duration.
GetSeconds());
541 uint16_t staId)
const
547 const auto mode = txVector.
GetMode(staId);
548 const auto rate = mode.
GetDataRate(txVector, staId);
549 auto nbits =
static_cast<uint64_t
>(rate * duration.
GetSeconds());
550 nbits /= txVector.
GetNss(staId);
568 std::pair<Time, Time> window)
const
570 NS_LOG_FUNCTION(
this << channelWidth << band << staId << window.first << window.second);
572 const auto& niIt = nis->find(band)->second;
573 auto j = niIt.cbegin();
574 auto previous = j->first;
576 const auto payloadMode =
event->GetPpdu()->GetTxVector().GetMode(staId);
577 auto phyPayloadStart = j->first;
579 event->GetPpdu()->GetType() !=
583 event->GetPpdu()->GetTxVector());
589 const auto windowStart = phyPayloadStart + window.first;
590 const auto windowEnd = phyPayloadStart + window.second;
593 auto power =
event->GetRxPower(band);
594 while (++j != niIt.cend())
596 Time current = j->first;
597 NS_LOG_DEBUG(
"previous= " << previous <<
", current=" << current);
602 event->GetPpdu()->GetTxVector().GetNss(staId));
604 if (previous >= windowStart)
607 Min(windowEnd, current) - previous,
608 event->GetPpdu()->GetTxVector(),
610 NS_LOG_DEBUG(
"Both previous and current point to the windowed payload: mode="
611 << payloadMode <<
", psr=" << psr);
614 else if (current >= windowStart)
617 Min(windowEnd, current) - windowStart,
618 event->GetPpdu()->GetTxVector(),
621 "previous is before windowed payload and current is in the windowed payload: mode="
622 << payloadMode <<
", psr=" << psr);
624 noiseInterference = j->second.GetPower() - power;
627 muMimoPower += j->second.GetEvent()->GetRxPower(band);
628 NS_LOG_DEBUG(
"PPDU belongs to same MU-MIMO transmission: muMimoPowerW=" << muMimoPower);
630 noiseInterference -= muMimoPower;
632 if (previous > windowEnd)
635 <<
" after time window end=" << windowEnd);
639 const auto per = 1.0 - psr;
652 auto niIt = nis->find(band)->second;
653 auto j = niIt.begin();
656 Time stopLastSection;
657 for (
const auto& section : phyHeaderSections)
659 stopLastSection =
Max(stopLastSection, section.second.first.second);
662 auto previous = j->first;
665 const auto power =
event->GetRxPower(band);
666 while (++j != niIt.end())
668 auto current = j->first;
669 NS_LOG_DEBUG(
"previous= " << previous <<
", current=" << current);
671 const auto snr =
CalculateSnr(power, noiseInterference, channelWidth, 1);
672 for (
const auto& section : phyHeaderSections)
674 const auto start = section.second.first.first;
675 const auto stop = section.second.first.second;
677 if (previous <= stop || current >= start)
679 const auto duration =
Min(stop, current) -
Max(start, previous);
680 if (duration.IsStrictlyPositive())
684 section.second.second,
685 event->GetPpdu()->GetTxVector(),
688 << section.first <<
" [" << start <<
", " << stop <<
"] for "
689 << duration.As(
Time::NS) <<
": mode=" << section.second.second
694 noiseInterference = j->second.GetPower() - power;
696 if (previous > stopLastSection)
698 NS_LOG_DEBUG(
"Stop: new previous=" << previous <<
" after stop of last section="
714 auto niIt = nis->find(band)->second;
719 for (
const auto& section :
720 phyEntity->GetPhyHeaderSections(event->GetPpdu()->GetTxVector(), niIt.begin()->first))
722 if (section.first == header)
724 sections[header] = section.second;
729 if (!sections.empty())
741 std::pair<Time, Time> relativeMpduStartStop)
const
743 NS_LOG_FUNCTION(
this << channelWidth << band << staId << relativeMpduStartStop.first
744 << relativeMpduStartStop.second);
750 event->GetPpdu()->GetTxVector().GetNss(staId));
769 return CalculateSnr(event->GetRxPower(band), noiseInterference, channelWidth, nss);
781 const auto snr =
CalculateSnr(event->GetRxPower(band), noiseInterference, channelWidth, 1);
791InterferenceHelper::NiChanges::iterator
794 return niIt->second.upper_bound(moment);
797InterferenceHelper::NiChanges::iterator
804InterferenceHelper::NiChanges::iterator
807 return niIt->second.insert(
GetNextPosition(moment, niIt), {moment, change});
831 m_firstPowers.find(niIt->first)->second = it->second.GetPower();
841 [&freqRange](
const auto& freqs) {
842 return ((freqs.second > MHzToHz(freqRange.minFrequency)) &&
843 (freqs.first < MHzToHz(freqRange.maxFrequency)));
853 (currentEvent->GetPpdu()->GetUid() == otherEvent->GetPpdu()->GetUid()))
855 const auto currentTxVector = currentEvent->GetPpdu()->GetTxVector();
856 const auto otherTxVector = otherEvent->GetPpdu()->GetTxVector();
857 NS_ASSERT(currentTxVector.GetHeMuUserInfoMap().size() == 1);
858 NS_ASSERT(otherTxVector.GetHeMuUserInfoMap().size() == 1);
859 const auto currentUserInfo = currentTxVector.GetHeMuUserInfoMap().cbegin();
860 const auto otherUserInfo = otherTxVector.GetHeMuUserInfoMap().cbegin();
861 return (currentUserInfo->second.ru == otherUserInfo->second.ru);
handles interference calculations
Watt_u GetRxPower() const
Return the total received power.
Time m_startTime
start time
Event(Ptr< const WifiPpdu > ppdu, Time duration, RxPowerWattPerChannelBand &&rxPower)
Create an Event with the given parameters.
Ptr< const WifiPpdu > GetPpdu() const
Return the PPDU.
Ptr< const WifiPpdu > m_ppdu
PPDU.
void UpdateRxPowerW(const RxPowerWattPerChannelBand &rxPower)
Update the received power (W) for all bands, i.e.
Time GetEndTime() const
Return the end time of the signal.
Time GetDuration() const
Return the duration of the signal.
const RxPowerWattPerChannelBand & GetRxPowerPerBand() const
Return the received power (W) for all bands.
RxPowerWattPerChannelBand m_rxPowerW
received power in watts per band
Time GetStartTime() const
Return the start time of the signal.
void UpdatePpdu(Ptr< const WifiPpdu > ppdu)
Update the PPDU that initially generated the event.
TxPsdFlag
The transmit power spectral density flag, namely used to correctly build PSDs for pre-HE and HE porti...
@ PSD_HE_PORTION
HE portion of an HE PPDU.
Noise and Interference (thus Ni) event.
Ptr< Event > m_event
event
void AddPower(Watt_u power)
Add a given amount of power.
NiChange(Watt_u power, Ptr< Event > event)
Create a NiChange at the given time and the amount of NI change.
Watt_u GetPower() const
Return the power.
Ptr< Event > GetEvent() const
Return the event causes the corresponding NI change.
handles interference calculations
double CalculatePhyHeaderPer(Ptr< const Event > event, NiChangesPerBand *nis, MHz_u channelWidth, const WifiSpectrumBandInfo &band, WifiPpduField header) const
Calculate the error rate of the PHY header.
void SetNoiseFigure(double value)
Set the noise figure.
Ptr< Event > Add(Ptr< const WifiPpdu > ppdu, Time duration, RxPowerWattPerChannelBand &rxPower, const FrequencyRange &freqRange, bool isStartHePortionRxing=false)
Add the PPDU-related signal to interference helper.
double m_noiseFigure
noise figure (linear)
std::map< FrequencyRange, bool > m_rxing
flag whether it is in receiving state for a given FrequencyRange
Ptr< ErrorRateModel > GetErrorRateModel() const
Return the error rate model.
NiChanges::iterator AddNiChangeEvent(Time moment, NiChange change, NiChangesPerBand::iterator niIt)
Add NiChange to the list at the appropriate position and return the iterator of the new event.
std::map< WifiSpectrumBandInfo, NiChanges > NiChangesPerBand
Map of NiChanges per band.
void NotifyRxStart(const FrequencyRange &freqRange)
Notify that RX has started.
NiChanges::iterator GetNextPosition(Time moment, NiChangesPerBand::iterator niIt) const
Returns an iterator to the first NiChange that is later than moment.
uint8_t m_numRxAntennas
the number of RX antennas in the corresponding receiver
bool IsBandInFrequencyRange(const WifiSpectrumBandInfo &band, const FrequencyRange &freqRange) const
Check whether a given band belongs to a given frequency range.
void DoDispose() override
Destructor implementation.
std::multimap< Time, NiChange > NiChanges
typedef for a multimap of NiChange
Time GetEnergyDuration(Watt_u energy, const WifiSpectrumBandInfo &band)
NiChangesPerBand m_niChanges
NI Changes for each band.
void UpdateBands(const std::vector< WifiSpectrumBandInfo > &bands, const FrequencyRange &freqRange)
Update the frequency bands that belongs to a given frequency range when the spectrum model is changed...
void SetErrorRateModel(const Ptr< ErrorRateModel > rate)
Set the error rate model for this interference helper.
bool HasBands() const
Check whether bands are already tracked by this interference helper.
void AddForeignSignal(Time duration, RxPowerWattPerChannelBand &rxPower, const FrequencyRange &freqRange)
Add a non-Wifi signal to interference helper.
double CalculatePayloadChunkSuccessRate(double snir, Time duration, const WifiTxVector &txVector, uint16_t staId=SU_STA_ID) const
Calculate the success rate of the payload chunk given the SINR, duration, and TXVECTOR.
Ptr< ErrorRateModel > m_errorRateModel
error rate model
SnrPer CalculatePhyHeaderSnrPer(Ptr< Event > event, MHz_u channelWidth, const WifiSpectrumBandInfo &band, WifiPpduField header) const
Calculate the SNIR at the start of the PHY header and accumulate all SNIR changes in the SNIR vector.
FirstPowerPerBand m_firstPowers
first power of each band
bool IsSameMuMimoTransmission(Ptr< const Event > currentEvent, Ptr< const Event > otherEvent) const
Return whether another event is a MU-MIMO event that belongs to the same transmission and to the same...
double CalculateChunkSuccessRate(double snir, Time duration, WifiMode mode, const WifiTxVector &txVector, WifiPpduField field) const
Calculate the success rate of the chunk given the SINR, duration, and TXVECTOR.
bool HasBand(const WifiSpectrumBandInfo &band) const
Check whether a given band is tracked by this interference helper.
void AddBand(const WifiSpectrumBandInfo &band)
Add a frequency band.
Watt_u CalculateMuMimoPowerW(Ptr< const Event > event, const WifiSpectrumBandInfo &band) const
Calculate power of all other events preceding a given event that belong to the same MU-MIMO transmiss...
void AppendEvent(Ptr< Event > event, const FrequencyRange &freqRange, bool isStartHePortionRxing)
Append the given Event.
static TypeId GetTypeId()
Get the type ID.
void UpdateEvent(Ptr< Event > event, const RxPowerWattPerChannelBand &rxPower)
Update event to scale its received power (W) per band.
void RemoveBand(const WifiSpectrumBandInfo &band)
Remove a frequency band.
void NotifyRxEnd(Time endTime, const FrequencyRange &freqRange)
Notify that RX has ended.
Watt_u CalculateNoiseInterferenceW(Ptr< Event > event, NiChangesPerBand &nis, const WifiSpectrumBandInfo &band) const
Calculate noise and interference power.
void SetNumberOfReceiveAntennas(uint8_t rx)
Set the number of RX antennas in the receiver corresponding to this interference helper.
SnrPer CalculatePayloadSnrPer(Ptr< Event > event, MHz_u channelWidth, const WifiSpectrumBandInfo &band, uint16_t staId, std::pair< Time, Time > relativeMpduStartStop) const
Calculate the SNIR at the start of the payload and accumulate all SNIR changes in the SNIR vector for...
NiChanges::iterator GetPreviousPosition(Time moment, NiChangesPerBand::iterator niIt) const
Returns an iterator to the last NiChange that is before than moment.
double CalculateSnr(Ptr< Event > event, MHz_u channelWidth, uint8_t nss, const WifiSpectrumBandInfo &band) const
Calculate the SNIR for the event (starting from now until the event end).
double CalculatePayloadPer(Ptr< const Event > event, MHz_u channelWidth, NiChangesPerBand *nis, const WifiSpectrumBandInfo &band, uint16_t staId, std::pair< Time, Time > window) const
Calculate the error rate of the given PHY payload only in the provided time window (thus enabling per...
double CalculatePhyHeaderSectionPsr(Ptr< const Event > event, NiChangesPerBand *nis, MHz_u channelWidth, const WifiSpectrumBandInfo &band, PhyHeaderSections phyHeaderSections) const
Calculate the success rate of the PHY header sections for the provided event.
~InterferenceHelper() override
A base class which provides memory management and object aggregation.
Smart pointer class similar to boost::intrusive_ptr.
Control the scheduling of simulation events.
static Time Now()
Return the current simulation virtual time.
Simulation virtual time values and global simulation resolution.
double GetSeconds() const
Get an approximation of the time stored in this instance in the indicated unit.
bool IsZero() const
Exactly equivalent to t == 0.
a unique identifier for an interface.
TypeId SetParent(TypeId tid)
Set the parent TypeId.
represent a single transmission mode
uint64_t GetDataRate(MHz_u channelWidth, Time guardInterval, uint8_t nss) const
static const std::shared_ptr< const PhyEntity > GetStaticPhyEntity(WifiModulationClass modulation)
Get the implemented PHY entity corresponding to the modulation class.
static Time CalculatePhyPreambleAndHeaderDuration(const WifiTxVector &txVector)
Class that keeps track of all information about the current PHY operating channel.
This class mimics the TXVECTOR which is to be passed to the PHY in order to define the parameters whi...
WifiMode GetMode(uint16_t staId=SU_STA_ID) const
If this TX vector is associated with an SU PPDU, return the selected payload transmission mode.
uint8_t GetNss(uint16_t staId=SU_STA_ID) const
If this TX vector is associated with an SU PPDU, return the number of spatial streams.
MHz_u GetChannelWidth() const
#define NS_ASSERT(condition)
At runtime, in debugging builds, if this condition is not true, the program prints the source file,...
#define NS_ASSERT_MSG(condition, message)
At runtime, in debugging builds, if this condition is not true, the program prints the message to out...
#define NS_ABORT_IF(cond)
Abnormal program termination if a condition is true.
#define NS_LOG_COMPONENT_DEFINE(name)
Define a Log component with a specific name.
#define NS_LOG_DEBUG(msg)
Use NS_LOG to output a message of level LOG_DEBUG.
#define NS_LOG_FUNCTION(parameters)
If log level LOG_FUNCTION is enabled, this macro will output all input parameters separated by ",...
#define NS_OBJECT_ENSURE_REGISTERED(type)
Register an Object subclass with the TypeId system.
Ptr< T > Create(Ts &&... args)
Create class instances by constructors with varying numbers of arguments and return them by Ptr.
Time Now()
create an ns3::Time instance which contains the current simulation time.
WifiPpduField
The type of PPDU field (grouped for convenience)
@ WIFI_PPDU_FIELD_DATA
data field
Every class exported by the ns3 library is enclosed in the ns3 namespace.
std::map< WifiSpectrumBandInfo, Watt_u > RxPowerWattPerChannelBand
A map of the received power for each band.
dB_u RatioToDb(double ratio)
Convert from ratio to dB.
std::ostream & operator<<(std::ostream &os, const Angles &a)
std::map< WifiPpduField, PhyHeaderChunkInfo > PhyHeaderSections
A map of PhyHeaderChunkInfo elements per PPDU field.
double MHz_u
MHz weak type.
Ptr< T1 > DynamicCast(const Ptr< T2 > &p)
Cast a Ptr.
Hz_u MHzToHz(MHz_u val)
Convert from MHz to Hz.
double Watt_u
Watt weak type.
Struct defining a frequency range between minFrequency and maxFrequency.
A struct for both SNR and PER.
WifiSpectrumBandInfo structure containing info about a spectrum band.
std::vector< WifiSpectrumBandFrequencies > frequencies
the start and stop frequencies for each segment of the band