Rakhmatov Vrudhula non-linear battery model. More...

#include <rv-battery-model.h>

Inheritance diagram for ns3::RvBatteryModel:

Collaboration diagram for ns3::RvBatteryModel:

Public Member Functions
	RvBatteryModel ()

virtual	~RvBatteryModel ()

double	GetAlpha (void) const

double	GetBatteryLevel (void)

double	GetBeta (void) const

double	GetCutoffVoltage (void) const

virtual double	GetEnergyFraction (void)

virtual double	GetInitialEnergy (void) const

Time	GetLifetime (void) const

int	GetNumOfTerms (void) const

double	GetOpenCircuitVoltage (void) const

virtual double	GetRemainingEnergy (void)

Time	GetSamplingInterval (void) const

virtual double	GetSupplyVoltage (void) const

void	SetAlpha (double alpha)
	Sets the alpha value for the battery model. More...

void	SetBeta (double beta)
	Sets the beta value for the battery model. More...

void	SetCutoffVoltage (double voltage)
	Sets cutoff voltage of battery. More...

void	SetNumOfTerms (int num)
	Sets the number of terms of the infinite sum for estimating battery level. More...

void	SetOpenCircuitVoltage (double voltage)
	Sets open circuit voltage of battery. More...

void	SetSamplingInterval (Time interval)

virtual void	UpdateEnergySource (void)
	Implements UpdateEnergySource. More...

Public Member Functions inherited from ns3::EnergySource
	EnergySource ()

virtual	~EnergySource ()

void	AppendDeviceEnergyModel (Ptr< DeviceEnergyModel > deviceEnergyModelPtr)

void	DisposeDeviceModels (void)
	Calls Dispose () method of the device energy models. More...

DeviceEnergyModelContainer	FindDeviceEnergyModels (TypeId tid)

DeviceEnergyModelContainer	FindDeviceEnergyModels (std::string name)

Ptr< Node >	GetNode (void) const

void	InitializeDeviceModels (void)
	Calls Start () method of the device energy models. More...

void	SetNode (Ptr< Node > node)
	Sets pointer to node containing this EnergySource. More...

Public Member Functions inherited from ns3::Object
	Object ()

virtual	~Object ()

void	AggregateObject (Ptr< Object > other)

void	Dispose (void)
	Run the DoDispose methods of this object and all the objects aggregated to it. More...

AggregateIterator	GetAggregateIterator (void) const

virtual TypeId	GetInstanceTypeId (void) const

template<typename T >
Ptr< T >	GetObject (void) const

template<typename T >
Ptr< T >	GetObject (TypeId tid) const

void	Initialize (void)
	This method calls the virtual DoInitialize method on all the objects aggregated to this object. More...

Public Member Functions inherited from ns3::SimpleRefCount< Object, ObjectBase, ObjectDeleter >
	SimpleRefCount ()
	Constructor. More...

	SimpleRefCount (const SimpleRefCount &o)
	Copy constructor. More...

uint32_t	GetReferenceCount (void) const
	Get the reference count of the object. More...

SimpleRefCount &	operator= (const SimpleRefCount &o)
	Assignment. More...

void	Ref (void) const
	Increment the reference count. More...

void	Unref (void) const
	Decrement the reference count. More...

Public Member Functions inherited from ns3::ObjectBase
virtual	~ObjectBase ()
	Virtual destructor. More...

void	GetAttribute (std::string name, AttributeValue &value) const

bool	GetAttributeFailSafe (std::string name, AttributeValue &attribute) const

void	SetAttribute (std::string name, const AttributeValue &value)

bool	SetAttributeFailSafe (std::string name, const AttributeValue &value)

bool	TraceConnect (std::string name, std::string context, const CallbackBase &cb)

bool	TraceConnectWithoutContext (std::string name, const CallbackBase &cb)

bool	TraceDisconnect (std::string name, std::string context, const CallbackBase &cb)

bool	TraceDisconnectWithoutContext (std::string name, const CallbackBase &cb)

Static Public Member Functions
static TypeId	GetTypeId (void)

Static Public Member Functions inherited from ns3::EnergySource
static TypeId	GetTypeId (void)

Static Public Member Functions inherited from ns3::Object
static TypeId	GetTypeId (void)
	Register this type. More...

Static Public Member Functions inherited from ns3::SimpleRefCount< Object, ObjectBase, ObjectDeleter >
static void	Cleanup (void)
	Noop. More...

Static Public Member Functions inherited from ns3::ObjectBase
static TypeId	GetTypeId (void)
	Get the type ID. More...

Private Member Functions
double	Discharge (double load, Time t)
	Discharges the battery. More...

virtual void	DoDispose (void)
	Defined in ns3::Object. More...

virtual void	DoInitialize (void)
	Defined in ns3::Object. More...

void	HandleEnergyDrainedEvent (void)
	Handles the remaining energy going to zero event. More...

double	RvModelAFunction (Time t, Time sk, Time sk_1, double beta)
	RV model A function. More...

Private Attributes
double	m_alpha

TracedValue< double >	m_batteryLevel
	Battery level is defined as: output of Discharge function / alpha value. More...

double	m_beta

EventId	m_currentSampleEvent

double	m_cutoffVoltage

Time	m_lastSampleTime

TracedValue< Time >	m_lifetime

std::vector< double >	m_load

int	m_numOfTerms

double	m_openCircuitVoltage

double	m_previousLoad

Time	m_samplingInterval
	(1 / sampling interval) = sampling frequency More...

std::vector< Time >	m_timeStamps

Additional Inherited Members
Protected Member Functions inherited from ns3::EnergySource
void	BreakDeviceEnergyModelRefCycle (void)
	This function is called to break reference cycle between EnergySource and DeviceEnergyModel. More...

double	CalculateTotalCurrent (void)

void	NotifyEnergyDrained (void)
	This function notifies all DeviceEnergyModel of energy depletion event. More...

Protected Member Functions inherited from ns3::Object
	Object (const Object &o)

virtual void	NotifyNewAggregate (void)
	This method is invoked whenever two sets of objects are aggregated together. More...

Protected Member Functions inherited from ns3::ObjectBase
void	ConstructSelf (const AttributeConstructionList &attributes)

virtual void	NotifyConstructionCompleted (void)
	This method is invoked once all member attributes have been initialized. More...

Detailed Description

Rakhmatov Vrudhula non-linear battery model.

Doxygen introspection did not find any typical Config paths.

This (energy source) model implements an analytical non-linear battery model. It is capable of capturing load capacity and recovery effects of batteries. Batteries are characterized by 2 parameters, alpha and beta, which can both be obtained from the discharge curve of the batteries.

The model is developed by Daler Rakhmatov & Sarma Vrudhula in: "Battery Lifetime Prediction for Energy-Aware Computing" and "An Analytical High-Level Battery Model for Use in Energy Management of Portable Electronic Systems".

The real-time algorithm is developed by Matthias Handy & Dirk Timmermann in: "Simulation of Mobile Wireless Networks with Accurate Modeling of non-linear battery effects". The real-time algorithm is modified by the authors of this code for improved accuracy and reduced computation (sampling) overhead.

Attributes

RvBatteryModelPeriodicEnergyUpdateInterval: RV battery model sampling interval.
- Set with class: ns3::TimeValue
- Underlying type: Time -9223372036854775808.0ns:+9223372036854775807.0ns
- Initial value: +1000000000.0ns
- Flags: construct write read
RvBatteryModelOpenCircuitVoltage: RV battery model open circuit voltage.
- Set with class: ns3::DoubleValue
- Underlying type: double -1.79769e+308:1.79769e+308
- Initial value: 4.1
- Flags: construct write read
RvBatteryModelCutoffVoltage: RV battery model cutoff voltage.
- Set with class: ns3::DoubleValue
- Underlying type: double -1.79769e+308:1.79769e+308
- Initial value: 3
- Flags: construct write read
RvBatteryModelAlphaValue: RV battery model alpha value.
- Set with class: ns3::DoubleValue
- Underlying type: double -1.79769e+308:1.79769e+308
- Initial value: 35220
- Flags: construct write read
RvBatteryModelBetaValue: RV battery model beta value.
- Set with class: ns3::DoubleValue
- Underlying type: double -1.79769e+308:1.79769e+308
- Initial value: 0.637
- Flags: construct write read
RvBatteryModelNumOfTerms: The number of terms of the infinite sum for estimating battery level.
- Set with class: ns3::IntegerValue
- Underlying type: int32_t -2147483648:2147483647
- Initial value: 10
- Flags: construct write read

TraceSources

RvBatteryModelBatteryLevel: RV battery model battery level.
RvBatteryModelBatteryLifetime: RV battery model battery lifetime.

Definition at line 50 of file rv-battery-model.h.

Constructor & Destructor Documentation

ns3::RvBatteryModel::RvBatteryModel ( )

Definition at line 88 of file rv-battery-model.cc.

References m_batteryLevel, m_lastSampleTime, m_lifetime, m_previousLoad, and NS_LOG_FUNCTION.

ns3::RvBatteryModel::~RvBatteryModel ( )

virtual

Definition at line 97 of file rv-battery-model.cc.

References NS_LOG_FUNCTION.

Member Function Documentation

double ns3::RvBatteryModel::Discharge	(	double	load,
		Time	t
	)

private

Discharges the battery.

Parameters

load	Load value (total current form devices, in mA).
t	Time stamp of the load value.

Returns: Calculated alpha value.

Discharge function calculates a value which is then compared to the alpha value to determine if the battery is dead. It will also update the battery level.

Note that the load value passed to Discharge has to be in mA.

Definition at line 314 of file rv-battery-model.cc.

References m_beta, m_lastSampleTime, m_load, m_previousLoad, m_timeStamps, NS_ASSERT, NS_LOG_FUNCTION, and RvModelAFunction().

Referenced by UpdateEnergySource().

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void ns3::RvBatteryModel::DoDispose ( void )

privatevirtual

Defined in ns3::Object.

Reimplemented from ns3::EnergySource.

Definition at line 299 of file rv-battery-model.cc.

References ns3::EnergySource::BreakDeviceEnergyModelRefCycle(), and NS_LOG_FUNCTION.

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void ns3::RvBatteryModel::DoInitialize ( void )

privatevirtual

Defined in ns3::Object.

Reimplemented from ns3::Object.

Definition at line 291 of file rv-battery-model.cc.

References NS_LOG_DEBUG, NS_LOG_FUNCTION, and UpdateEnergySource().

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double ns3::RvBatteryModel::GetAlpha ( void ) const

Returns: The alpha value used by the battery model.

Definition at line 236 of file rv-battery-model.cc.

References m_alpha, and NS_LOG_FUNCTION.

Referenced by GetTypeId().

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double ns3::RvBatteryModel::GetBatteryLevel ( void )

Returns: Battery level [0, 1].

Definition at line 258 of file rv-battery-model.cc.

References m_batteryLevel, NS_LOG_FUNCTION, and UpdateEnergySource().

Referenced by GetEnergyFraction().

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double ns3::RvBatteryModel::GetBeta ( void ) const

Returns: The beta value used by the battery model.

Definition at line 251 of file rv-battery-model.cc.

References m_beta, and NS_LOG_FUNCTION.

Referenced by GetTypeId().

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double ns3::RvBatteryModel::GetCutoffVoltage ( void ) const

Returns: Cutoff voltage of battery.

Definition at line 221 of file rv-battery-model.cc.

References m_cutoffVoltage, and NS_LOG_FUNCTION.

Referenced by GetTypeId().

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double ns3::RvBatteryModel::GetEnergyFraction ( void )

virtual

Returns: Energy fraction.

Implements GetEnergyFraction. For the RV battery model, energy fraction is equivalent to battery level.

Implements ns3::EnergySource.

Definition at line 126 of file rv-battery-model.cc.

References GetBatteryLevel(), and NS_LOG_FUNCTION.

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double ns3::RvBatteryModel::GetInitialEnergy ( void ) const

virtual

Returns: Initial energy stored (theoretical capacity) in the battery.

Implements GetInitialEnergy.

Implements ns3::EnergySource.

Definition at line 103 of file rv-battery-model.cc.

References GetSupplyVoltage(), m_alpha, and NS_LOG_FUNCTION.

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Time ns3::RvBatteryModel::GetLifetime ( void ) const

Returns: Lifetime of the battery.

Definition at line 266 of file rv-battery-model.cc.

References m_lifetime, and NS_LOG_FUNCTION.

Referenced by BatteryLifetimeTest::ConstantLoadTest(), and BatteryLifetimeTest::VariableLoadTest().

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int ns3::RvBatteryModel::GetNumOfTerms ( void ) const

Returns: The number of terms of the infinite sum for estimating battery level.

Definition at line 280 of file rv-battery-model.cc.

References m_numOfTerms, and NS_LOG_FUNCTION.

Referenced by GetTypeId().

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double ns3::RvBatteryModel::GetOpenCircuitVoltage ( void ) const

Returns: Open circuit voltage of battery.

Definition at line 206 of file rv-battery-model.cc.

References m_openCircuitVoltage, and NS_LOG_FUNCTION.

Referenced by GetTypeId().

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double ns3::RvBatteryModel::GetRemainingEnergy ( void )

virtual

Returns: Remaining energy in energy source, in Joules

Implements GetRemainingEnergy.

Implements ns3::EnergySource.

Definition at line 118 of file rv-battery-model.cc.

References GetSupplyVoltage(), m_alpha, m_batteryLevel, NS_LOG_FUNCTION, and UpdateEnergySource().

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Time ns3::RvBatteryModel::GetSamplingInterval ( void ) const

Returns: The interval between each energy update.

Definition at line 191 of file rv-battery-model.cc.

References m_samplingInterval, and NS_LOG_FUNCTION.

Referenced by GetTypeId().

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double ns3::RvBatteryModel::GetSupplyVoltage ( void ) const

virtual

Returns: Supply voltage at the energy source.

Implements GetSupplyVoltage.

Implements ns3::EnergySource.

Definition at line 110 of file rv-battery-model.cc.

References m_cutoffVoltage, m_openCircuitVoltage, and NS_LOG_FUNCTION.

Referenced by GetInitialEnergy(), and GetRemainingEnergy().

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TypeId ns3::RvBatteryModel::GetTypeId ( void )

static

Definition at line 37 of file rv-battery-model.cc.

References GetAlpha(), GetBeta(), GetCutoffVoltage(), GetNumOfTerms(), GetOpenCircuitVoltage(), GetSamplingInterval(), m_batteryLevel, m_lifetime, ns3::MakeTimeChecker(), ns3::MakeTraceSourceAccessor(), SetAlpha(), SetBeta(), SetCutoffVoltage(), SetNumOfTerms(), SetOpenCircuitVoltage(), ns3::TypeId::SetParent(), and SetSamplingInterval().

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void ns3::RvBatteryModel::HandleEnergyDrainedEvent ( void )

private

Handles the remaining energy going to zero event.

This function notifies all the energy models aggregated to the node about the energy being depleted. Each energy model is then responsible for its own handler.

Definition at line 306 of file rv-battery-model.cc.

References ns3::EnergySource::NotifyEnergyDrained(), NS_LOG_DEBUG, and NS_LOG_FUNCTION.

Referenced by UpdateEnergySource().

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double ns3::RvBatteryModel::RvModelAFunction	(	Time	t,
		Time	sk,
		Time	sk_1,
		double	beta
	)

private

RV model A function.

Parameters

t	Current time.
sk	Time stamp in array position k
sk_1	Time stamp in array position k-1
beta	Beta value used by the battery model.

Returns: Result of A function.

This function computes alpha value using the recorded load profile.

Definition at line 364 of file rv-battery-model.cc.

References ns3::Time::GetSeconds(), m_numOfTerms, and NS_LOG_FUNCTION.

Referenced by Discharge().

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void ns3::RvBatteryModel::SetAlpha ( double alpha )

Sets the alpha value for the battery model.

Parameters

alpha Alpha.

Definition at line 228 of file rv-battery-model.cc.

References m_alpha, NS_ASSERT, and NS_LOG_FUNCTION.

Referenced by GetTypeId().

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void ns3::RvBatteryModel::SetBeta ( double beta )

Sets the beta value for the battery model.

Parameters

beta Beta.

Definition at line 243 of file rv-battery-model.cc.

References m_beta, NS_ASSERT, and NS_LOG_FUNCTION.

Referenced by GetTypeId().

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void ns3::RvBatteryModel::SetCutoffVoltage ( double voltage )

Sets cutoff voltage of battery.

Parameters

voltage Cutoff voltage.

Definition at line 213 of file rv-battery-model.cc.

References m_cutoffVoltage, m_openCircuitVoltage, NS_ASSERT, and NS_LOG_FUNCTION.

Referenced by GetTypeId().

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void ns3::RvBatteryModel::SetNumOfTerms ( int num )

Sets the number of terms of the infinite sum for estimating battery level.

Parameters

num	Number of terms.

Definition at line 273 of file rv-battery-model.cc.

References m_numOfTerms, and NS_LOG_FUNCTION.

Referenced by GetTypeId().

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void ns3::RvBatteryModel::SetOpenCircuitVoltage ( double voltage )

Sets open circuit voltage of battery.

Parameters

voltage Open circuit voltage.

Definition at line 198 of file rv-battery-model.cc.

References m_openCircuitVoltage, NS_ASSERT, and NS_LOG_FUNCTION.

Referenced by GetTypeId().

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void ns3::RvBatteryModel::SetSamplingInterval ( Time interval )

Parameters

interval Energy update interval.

This function sets the interval between each energy update.

Definition at line 184 of file rv-battery-model.cc.

References m_samplingInterval, and NS_LOG_FUNCTION.

Referenced by GetTypeId().

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void ns3::RvBatteryModel::UpdateEnergySource ( void )

virtual

Implements UpdateEnergySource.

This function samples the total load (total current) from all devices to discharge the battery.

Implements ns3::EnergySource.

Definition at line 133 of file rv-battery-model.cc.

References ns3::EnergySource::CalculateTotalCurrent(), ns3::EventId::Cancel(), Discharge(), HandleEnergyDrainedEvent(), ns3::Simulator::IsFinished(), m_alpha, m_batteryLevel, m_currentSampleEvent, m_lastSampleTime, m_lifetime, m_previousLoad, m_samplingInterval, ns3::Simulator::Now(), NS_LOG_DEBUG, NS_LOG_FUNCTION, and ns3::Simulator::Schedule().

Referenced by DoInitialize(), GetBatteryLevel(), and GetRemainingEnergy().

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Member Data Documentation

double ns3::RvBatteryModel::m_alpha

private

Definition at line 221 of file rv-battery-model.h.

Referenced by GetAlpha(), GetInitialEnergy(), GetRemainingEnergy(), SetAlpha(), and UpdateEnergySource().

TracedValue<double> ns3::RvBatteryModel::m_batteryLevel

private

Battery level is defined as: output of Discharge function / alpha value.

The output of Discharge function is an estimated charge consumption of the battery.

The alpha value is the amount of charges stored in the battery, or battery capacity (in Coulomb).

When the battery is fully charged (no charge is consumed from the battery) the battery level is 1. When the battery is fully discharged, the battery level is 0.

NOTE Note that the definition in Timmermann's paper is the inverse of this definition. In the paper, battery level = 1 when the battery is drained.

Definition at line 247 of file rv-battery-model.h.

Referenced by GetBatteryLevel(), GetRemainingEnergy(), GetTypeId(), RvBatteryModel(), and UpdateEnergySource().

double ns3::RvBatteryModel::m_beta

private

Definition at line 222 of file rv-battery-model.h.

Referenced by Discharge(), GetBeta(), and SetBeta().

EventId ns3::RvBatteryModel::m_currentSampleEvent

private

Definition at line 253 of file rv-battery-model.h.

Referenced by UpdateEnergySource().

double ns3::RvBatteryModel::m_cutoffVoltage