a linear model of the Wifi transmit current More...

#include "wifi-tx-current-model.h"

Inheritance diagram for ns3::LinearWifiTxCurrentModel:

Collaboration diagram for ns3::LinearWifiTxCurrentModel:

Public Member Functions
	LinearWifiTxCurrentModel ()

	~LinearWifiTxCurrentModel () override

ampere_u	CalcTxCurrent (dBm_u txPower) const override

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

	~WifiTxCurrentModel () override

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

	~Object () override
	Destructor.

void	AggregateObject (Ptr< Object > other)
	Aggregate two Objects together.

void	Dispose ()
	Dispose of this Object.

AggregateIterator	GetAggregateIterator () const
	Get an iterator to the Objects aggregated to this one.

TypeId	GetInstanceTypeId () const override
	Get the most derived TypeId for this Object.

template<typename T >
Ptr< T >	GetObject () const
	Get a pointer to the requested aggregated Object.

template<>
Ptr< Object >	GetObject () const
	Specialization of () for objects of type ns3::Object.

template<typename T >
Ptr< T >	GetObject (TypeId tid) const
	Get a pointer to the requested aggregated Object by TypeId.

template<>
Ptr< Object >	GetObject (TypeId tid) const
	Specialization of (TypeId tid) for objects of type ns3::Object.

void	Initialize ()
	Invoke DoInitialize on all Objects aggregated to this one.

bool	IsInitialized () const
	Check if the object has been initialized.

void	UnidirectionalAggregateObject (Ptr< Object > other)
	Aggregate an Object to another Object.

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

	SimpleRefCount (const SimpleRefCount &o)
	Copy constructor.

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

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

void	Ref () const
	Increment the reference count.

void	Unref () const
	Decrement the reference count.

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

void	GetAttribute (std::string name, AttributeValue &value, bool permissive=false) const
	Get the value of an attribute, raising fatal errors if unsuccessful.

bool	GetAttributeFailSafe (std::string name, AttributeValue &value) const
	Get the value of an attribute without raising errors.

void	SetAttribute (std::string name, const AttributeValue &value)
	Set a single attribute, raising fatal errors if unsuccessful.

bool	SetAttributeFailSafe (std::string name, const AttributeValue &value)
	Set a single attribute without raising errors.

bool	TraceConnect (std::string name, std::string context, const CallbackBase &cb)
	Connect a TraceSource to a Callback with a context.

bool	TraceConnectWithoutContext (std::string name, const CallbackBase &cb)
	Connect a TraceSource to a Callback without a context.

bool	TraceDisconnect (std::string name, std::string context, const CallbackBase &cb)
	Disconnect from a TraceSource a Callback previously connected with a context.

bool	TraceDisconnectWithoutContext (std::string name, const CallbackBase &cb)
	Disconnect from a TraceSource a Callback previously connected without a context.

Static Public Member Functions
static TypeId	GetTypeId ()
	Get the type ID.

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

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

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

Private Attributes
double	m_eta
	ETA.

ampere_u	m_idleCurrent
	idle current

volt_u	m_voltage
	voltage

Additional Inherited Members
Protected Member Functions inherited from ns3::Object
	Object (const Object &o)
	Copy an Object.

virtual void	DoDispose ()
	Destructor implementation.

virtual void	DoInitialize ()
	Initialize() implementation.

virtual void	NotifyNewAggregate ()
	Notify all Objects aggregated to this one of a new Object being aggregated.

Protected Member Functions inherited from ns3::ObjectBase
void	ConstructSelf (const AttributeConstructionList &attributes)
	Complete construction of ObjectBase; invoked by derived classes.

virtual void	NotifyConstructionCompleted ()
	Notifier called once the ObjectBase is fully constructed.

Related Symbols inherited from ns3::ObjectBase
static TypeId	GetObjectIid ()
	Ensure the TypeId for ObjectBase gets fully configured to anchor the inheritance tree properly.

Detailed Description

a linear model of the Wifi transmit current

This model assumes that the transmit current is a linear function of the nominal transmit power used to send the frame. In particular, the power absorbed during the transmission of a frame $W_{tx}$ is given by the power absorbed by the power amplifier $W_{pa}$ plus the power absorbed by the RF subsystem. The latter is assumed to be the same as the power absorbed in the IDLE state $W_{idle}$ .

The efficiency $\eta$ of the power amplifier is given by $\eta = \frac{P_{tx}}{W_{pa}}$ , where $P_{tx}$ is the output power, i.e., the nominal transmit power. Hence, $W_{pa} = \frac{P_{tx}}{\eta}$

It turns out that $W_{tx} = \frac{P_{tx}}{\eta} + W_{idle}$ . By dividing both sides by the supply voltage : $I_{tx} = \frac{P_{tx}}{V \cdot \eta} + I_{idle}$ , where $I_{tx}$ and $I_{idle}$ are, respectively, the transmit current and the idle current.

For more information, refer to: Francesco Ivan Di Piazza, Stefano Mangione, and Ilenia Tinnirello. "On the Effects of Transmit Power Control on the Energy Consumption of WiFi Network Cards", Proceedings of ICST QShine 2009, pp. 463–475

If the TX current corresponding to a given nominal transmit power is known, the efficiency of the power amplifier is given by the above formula: $\eta = \frac{P_{tx}}{(I_{tx}-I_{idle})\cdot V}$