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)
472 while (++it != niIt->second.end() && it->second.GetEvent() != event)
477 nis.insert({band, ni});
479 "CalculateNoiseInterferenceW returns negative value " << noiseInterference);
480 return noiseInterference;
489 auto it = niIt->second.begin();
492 for (; it != niIt->second.end() && it->first <
Simulator::Now(); ++it)
502 event->GetPpdu()->GetTxVector().GetHeMuUserInfoMap().cbegin()->first;
503 const auto otherStaId = it->second.GetEvent()
506 .GetHeMuUserInfoMap()
509 if (staId == otherStaId)
513 muMimoPower += it->second.GetEvent()->GetRxPower(band);
532 auto nbits =
static_cast<uint64_t
>(rate * duration.
GetSeconds());
542 uint16_t staId)
const
548 const auto mode = txVector.
GetMode(staId);
549 const auto rate = mode.
GetDataRate(txVector, staId);
550 auto nbits =
static_cast<uint64_t
>(rate * duration.
GetSeconds());
551 nbits /= txVector.
GetNss(staId);
569 std::pair<Time, Time> window)
const
571 NS_LOG_FUNCTION(
this << channelWidth << band << staId << window.first << window.second);
573 const auto& niIt = nis->find(band)->second;
574 auto j = niIt.cbegin();
575 auto previous = j->first;
577 const auto payloadMode =
event->GetPpdu()->GetTxVector().GetMode(staId);
578 auto phyPayloadStart = j->first;
580 event->GetPpdu()->GetType() !=
584 event->GetPpdu()->GetTxVector());
590 const auto windowStart = phyPayloadStart + window.first;
591 const auto windowEnd = phyPayloadStart + window.second;
594 auto power =
event->GetRxPower(band);
595 while (++j != niIt.cend())
597 Time current = j->first;
598 NS_LOG_DEBUG(
"previous= " << previous <<
", current=" << current);
603 event->GetPpdu()->GetTxVector().GetNss(staId));
605 if (previous >= windowStart)
608 Min(windowEnd, current) - previous,
609 event->GetPpdu()->GetTxVector(),
611 NS_LOG_DEBUG(
"Both previous and current point to the windowed payload: mode="
612 << payloadMode <<
", psr=" << psr);
615 else if (current >= windowStart)
618 Min(windowEnd, current) - windowStart,
619 event->GetPpdu()->GetTxVector(),
622 "previous is before windowed payload and current is in the windowed payload: mode="
623 << payloadMode <<
", psr=" << psr);
625 noiseInterference = j->second.GetPower() - power;
628 muMimoPower += j->second.GetEvent()->GetRxPower(band);
629 NS_LOG_DEBUG(
"PPDU belongs to same MU-MIMO transmission: muMimoPowerW=" << muMimoPower);
631 noiseInterference -= muMimoPower;
633 if (previous > windowEnd)
636 <<
" after time window end=" << windowEnd);
640 const auto per = 1.0 - psr;
653 auto niIt = nis->find(band)->second;
654 auto j = niIt.begin();
657 Time stopLastSection;
658 for (
const auto& section : phyHeaderSections)
660 stopLastSection =
Max(stopLastSection, section.second.first.second);
663 auto previous = j->first;
666 const auto power =
event->GetRxPower(band);
667 while (++j != niIt.end())
669 auto current = j->first;
670 NS_LOG_DEBUG(
"previous= " << previous <<
", current=" << current);
672 const auto snr =
CalculateSnr(power, noiseInterference, channelWidth, 1);
673 for (
const auto& section : phyHeaderSections)
675 const auto start = section.second.first.first;
676 const auto stop = section.second.first.second;
678 if (previous <= stop || current >= start)
680 const auto duration =
Min(stop, current) -
Max(start, previous);
681 if (duration.IsStrictlyPositive())
685 section.second.second,
686 event->GetPpdu()->GetTxVector(),
689 << section.first <<
" [" << start <<
", " << stop <<
"] for "
690 << duration.As(
Time::NS) <<
": mode=" << section.second.second
695 noiseInterference = j->second.GetPower() - power;
697 if (previous > stopLastSection)
699 NS_LOG_DEBUG(
"Stop: new previous=" << previous <<
" after stop of last section="
715 auto niIt = nis->find(band)->second;
720 for (
const auto& section :
721 phyEntity->GetPhyHeaderSections(event->GetPpdu()->GetTxVector(), niIt.begin()->first))
723 if (section.first == header)
725 sections[header] = section.second;
730 if (!sections.empty())
742 std::pair<Time, Time> relativeMpduStartStop)
const
744 NS_LOG_FUNCTION(
this << channelWidth << band << staId << relativeMpduStartStop.first
745 << relativeMpduStartStop.second);
751 event->GetPpdu()->GetTxVector().GetNss(staId));
770 return CalculateSnr(event->GetRxPower(band), noiseInterference, channelWidth, nss);
782 const auto snr =
CalculateSnr(event->GetRxPower(band), noiseInterference, channelWidth, 1);
792InterferenceHelper::NiChanges::iterator
795 return niIt->second.upper_bound(moment);
798InterferenceHelper::NiChanges::iterator
805InterferenceHelper::NiChanges::iterator
808 return niIt->second.insert(
GetNextPosition(moment, niIt), {moment, change});
832 m_firstPowers.find(niIt->first)->second = it->second.GetPower();
842 [&freqRange](
const auto& freqs) {
843 return ((freqs.second > MHzToHz(freqRange.minFrequency)) &&
844 (freqs.first < MHzToHz(freqRange.maxFrequency)));
854 (currentEvent->GetPpdu()->GetUid() == otherEvent->GetPpdu()->GetUid()))
856 const auto currentTxVector = currentEvent->GetPpdu()->GetTxVector();
857 const auto otherTxVector = otherEvent->GetPpdu()->GetTxVector();
858 NS_ASSERT(currentTxVector.GetHeMuUserInfoMap().size() == 1);
859 NS_ASSERT(otherTxVector.GetHeMuUserInfoMap().size() == 1);
860 const auto currentUserInfo = currentTxVector.GetHeMuUserInfoMap().cbegin();
861 const auto otherUserInfo = otherTxVector.GetHeMuUserInfoMap().cbegin();
862 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