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.
void	SetBeta (double beta)
	Sets the beta value for the battery model.
void	SetCutoffVoltage (double voltage)
	Sets cutoff voltage of battery.
void	SetNumOfTerms (int num)
	Sets the number of terms of the infinite sum for estimating battery level.
void	SetOpenCircuitVoltage (double voltage)
	Sets open circuit voltage of battery.
void	SetSamplingInterval (Time interval)
virtual void	UpdateEnergySource (void)
Public Member Functions inherited from ns3::EnergySource
	EnergySource ()
virtual	~EnergySource ()
void	AppendDeviceEnergyModel (Ptr< DeviceEnergyModel > deviceEnergyModelPtr)
void	DisposeDeviceModels (void)
DeviceEnergyModelContainer	FindDeviceEnergyModels (TypeId tid)
DeviceEnergyModelContainer	FindDeviceEnergyModels (std::string name)
Ptr< Node >	GetNode (void) const
void	SetNode (Ptr< Node > node)
	Sets pointer to node containing this EnergySource.
void	StartDeviceModels (void)
Public Member Functions inherited from ns3::Object
	Object ()
virtual	~Object ()
void	AggregateObject (Ptr< Object > other)
void	Dispose (void)
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	Start (void)
Public Member Functions inherited from ns3::SimpleRefCount< Object, ObjectBase, ObjectDeleter >
	SimpleRefCount ()
	SimpleRefCount (const SimpleRefCount &o)
uint32_t	GetReferenceCount (void) const
SimpleRefCount &	operator= (const SimpleRefCount &o)
void	Ref (void) const
void	Unref (void) const
Public Member Functions inherited from ns3::ObjectBase
virtual	~ObjectBase ()
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)
	This method returns the TypeId associated to ns3::RvBatteryModel.

Private Member Functions
double	Discharge (double load, Time t)
	Discharges the battery.
virtual void	DoDispose (void)
	Defined in ns3::Object.
virtual void	DoStart (void)
	Defined in ns3::Object.
void	HandleEnergyDrainedEvent (void)
double	RvModelAFunction (Time t, Time sk, Time sk_1, double beta)
	RV model A function.

Private Attributes
double	m_alpha
TracedValue< double >	m_batteryLevel
double	m_beta
uint64_t	m_counter
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
std::vector< Time >	m_timeStamps

Additional Inherited Members
Protected Member Functions inherited from ns3::EnergySource
void	BreakDeviceEnergyModelRefCycle (void)
double	CalculateTotalCurrent (void)
void	NotifyEnergyDrained (void)

Detailed Description

Rakhmatov Vrudhula non-linear battery model.

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.

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

Constructor & Destructor Documentation

ns3::RvBatteryModel::RvBatteryModel ( )

Definition at line 87 of file rv-battery-model.cc.

References m_batteryLevel, m_lastSampleTime, m_lifetime, m_previousLoad, and ns3::Seconds().

Here is the call graph for this function:

ns3::RvBatteryModel::~RvBatteryModel ( )

virtual

Definition at line 95 of file rv-battery-model.cc.

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 299 of file rv-battery-model.cc.

References m_beta, m_lastSampleTime, m_load, m_previousLoad, m_timeStamps, NS_ASSERT, NS_LOG_FUNCTION, RvModelAFunction(), and ns3::Seconds().

Referenced by UpdateEnergySource().

Here is the call graph for this function:

Here is the caller graph for this function:

void ns3::RvBatteryModel::DoDispose ( void )

privatevirtual

Defined in ns3::Object.

Definition at line 285 of file rv-battery-model.cc.

References ns3::EnergySource::BreakDeviceEnergyModelRefCycle().

Here is the call graph for this function:

void ns3::RvBatteryModel::DoStart ( void )

privatevirtual

Defined in ns3::Object.

Definition at line 278 of file rv-battery-model.cc.

References NS_LOG_DEBUG, and UpdateEnergySource().

Here is the call graph for this function:

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

Returns: The alpha value used by the battery model.

Definition at line 227 of file rv-battery-model.cc.

References m_alpha.

Referenced by GetTypeId().

Here is the caller graph for this function:

double ns3::RvBatteryModel::GetBatteryLevel ( void )

Returns: Battery level [0, 1].

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

References m_batteryLevel, NS_LOG_FUNCTION, and UpdateEnergySource().

Referenced by GetEnergyFraction().

Here is the call graph for this function:

Here is the caller graph for this function:

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

Returns: The beta value used by the battery model.

Definition at line 241 of file rv-battery-model.cc.

References m_beta.

Referenced by GetTypeId().

Here is the caller graph for this function:

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

Returns: Cutoff voltage of battery.

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

References m_cutoffVoltage.

Referenced by GetTypeId().

Here is the caller graph for this function:

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 121 of file rv-battery-model.cc.

References GetBatteryLevel().

Here is the call graph for this function:

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

virtual

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

Implements GetInitialEnergy.

Implements ns3::EnergySource.

Definition at line 100 of file rv-battery-model.cc.

References GetSupplyVoltage(), and m_alpha.

Here is the call graph for this function:

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

Returns: Lifetime of the battery.

Definition at line 255 of file rv-battery-model.cc.

References m_lifetime.

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

Here is the caller graph for this function:

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

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

Definition at line 268 of file rv-battery-model.cc.

References m_numOfTerms.

Referenced by GetTypeId().

Here is the caller graph for this function:

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

Returns: Open circuit voltage of battery.

Definition at line 199 of file rv-battery-model.cc.

References m_openCircuitVoltage.

Referenced by GetTypeId().

Here is the caller graph for this function:

double ns3::RvBatteryModel::GetRemainingEnergy ( void )

virtual

Returns: Remaining energy in energy source, in Joules

Implements GetRemainingEnergy.

Implements ns3::EnergySource.

Definition at line 113 of file rv-battery-model.cc.

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

Here is the call graph for this function:

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

Returns: The interval between each energy update.

Definition at line 185 of file rv-battery-model.cc.

References m_samplingInterval.

Referenced by GetTypeId().

Here is the caller graph for this function:

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

virtual

Returns: Supply voltage at the energy source.

Implements GetSupplyVoltage.

Implements ns3::EnergySource.

Definition at line 106 of file rv-battery-model.cc.

References m_cutoffVoltage, and m_openCircuitVoltage.

Referenced by GetInitialEnergy(), and GetRemainingEnergy().

Here is the caller graph for this function:

TypeId ns3::RvBatteryModel::GetTypeId ( void )

static

This method returns the TypeId associated to ns3::RvBatteryModel.

Attributes defined for this type:

RvBatteryModelPeriodicEnergyUpdateInterval: RV battery model sampling interval.
- Set with class: TimeValue
- Underlying type: Time
- 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 defined for this type:

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

Reimplemented from ns3::EnergySource.

Definition at line 36 of file rv-battery-model.cc.

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

Here is the call graph for this function:

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 291 of file rv-battery-model.cc.

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

Referenced by UpdateEnergySource().

Here is the call graph for this function:

Here is the caller graph for this function:

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 349 of file rv-battery-model.cc.

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

Referenced by Discharge().

Here is the call graph for this function:

Here is the caller graph for this function:

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

Sets the alpha value for the battery model.

Parameters

alpha Alpha.

Definition at line 219 of file rv-battery-model.cc.

References m_alpha, NS_ASSERT, and NS_LOG_FUNCTION.

Referenced by GetTypeId().

Here is the caller graph for this function:

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

Sets the beta value for the battery model.

Parameters

beta Beta.

Definition at line 233 of file rv-battery-model.cc.

References m_beta, NS_ASSERT, and NS_LOG_FUNCTION.

Referenced by GetTypeId().

Here is the caller graph for this function:

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

Sets cutoff voltage of battery.

Parameters

voltage Cutoff voltage.

Definition at line 205 of file rv-battery-model.cc.

References m_cutoffVoltage, m_openCircuitVoltage, NS_ASSERT, and NS_LOG_FUNCTION.

Referenced by GetTypeId().

Here is the caller graph for this function:

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 261 of file rv-battery-model.cc.

References m_numOfTerms, and NS_LOG_FUNCTION.

Referenced by GetTypeId().

Here is the caller graph for this function:

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

Sets open circuit voltage of battery.

Parameters

voltage Open circuit voltage.

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

References m_openCircuitVoltage, NS_ASSERT, and NS_LOG_FUNCTION.

Referenced by GetTypeId().

Here is the caller graph for this function:

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

Parameters

interval Energy update interval.

This function sets the interval between each energy update.

Definition at line 178 of file rv-battery-model.cc.

References m_samplingInterval, and NS_LOG_FUNCTION.

Referenced by GetTypeId().

Here is the caller graph for this function:

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 127 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::Now(), ns3::Simulator::Now(), NS_LOG_DEBUG, NS_LOG_FUNCTION, and ns3::Simulator::Schedule().

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

Here is the call graph for this function:

Here is the caller graph for this function:

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 248 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().

uint64_t ns3::RvBatteryModel::m_counter

private

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

EventId ns3::RvBatteryModel::m_currentSampleEvent

private