Determine which bursts of packets are errored corresponding to an underlying distribution, burst rate, and burst size. More...

#include "error-model.h"

Inheritance diagram for ns3::BurstErrorModel:

Collaboration diagram for ns3::BurstErrorModel:

Public Member Functions
	BurstErrorModel ()

	~BurstErrorModel () override

int64_t	AssignStreams (int64_t stream)
	Assign a fixed random variable stream number to the random variables used by this model.

double	GetBurstRate () const

void	SetBurstRate (double rate)

void	SetRandomBurstSize (Ptr< RandomVariableStream > burstSz)

void	SetRandomVariable (Ptr< RandomVariableStream > ranVar)

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

	~ErrorModel () override

void	Disable ()
	Disable the error model.

void	Enable ()
	Enable the error model.

bool	IsCorrupt (Ptr< Packet > pkt)
	Note: Depending on the error model, this function may or may not alter the contents of the packet upon returning true.

bool	IsEnabled () const

void	Reset ()
	Reset any state associated with the error model.

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::ErrorModel
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 Member Functions
bool	DoCorrupt (Ptr< Packet > p) override
	Corrupt a packet according to the specified model.

void	DoReset () override
	Re-initialize any state.

Private Attributes
double	m_burstRate
	the burst error event

Ptr< RandomVariableStream >	m_burstSize
	the number of packets being flagged as errored

Ptr< RandomVariableStream >	m_burstStart
	the error decision variable

uint32_t	m_counter
	keep track of the number of packets being errored until it reaches m_burstSize

uint32_t	m_currentBurstSz
	the current burst size

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

Determine which bursts of packets are errored corresponding to an underlying distribution, burst rate, and burst size.

This object is used to flag packets as being lost/errored or not. The two parameters that govern the behavior are the burst rate (or equivalently, the mean duration/spacing between between error events), and the burst size (or equivalently, the number of packets being flagged as errored at each error event).

Users can optionally provide RandomVariableStream objects; the default for the decision variable is to use a Uniform(0,1) distribution; the default for the burst size (number of packets) is to use a discrete Uniform[1,4] distribution.

For every packet, the model generates a random number based on the decision variable, and compares it with the burst error rate to determine if a burst error event should occur. If a new error event occurs, the model to will generate a new burst size to determine how many packets should be dropped in this particular burst error event in addition to the current packet.

When a second packet arrives, the model again determines if a new error event should occur based on a newly generated decision variable and the burst error rate. If a new error event is determined to occur, the model will restart with a new burst size. Otherwise, the model will resume the last error event and drop the packet provided that the total number of packets that has been dropped does not exceed the burst size.

IsCorrupt() will not modify the packet data buffer

Definition at line 287 of file error-model.h.

Constructor & Destructor Documentation

◆ BurstErrorModel()

ns3::BurstErrorModel::BurstErrorModel ( )

Definition at line 312 of file error-model.cc.

◆ ~BurstErrorModel()

ns3::BurstErrorModel::~BurstErrorModel ( )

override

Definition at line 318 of file error-model.cc.

References NS_LOG_FUNCTION.

Member Function Documentation

◆ AssignStreams()

int64_t ns3::BurstErrorModel::AssignStreams ( int64_t stream )

Assign a fixed random variable stream number to the random variables used by this model.

Return the number of streams (possibly zero) that have been assigned.

Parameters

stream first stream index to use

Returns: the number of stream indices assigned by this model

Definition at line 352 of file error-model.cc.

References m_burstSize, m_burstStart, NS_LOG_FUNCTION, and ns3::RandomVariableStream::SetStream().

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◆ DoCorrupt()

bool ns3::BurstErrorModel::DoCorrupt ( Ptr< Packet > p )

overrideprivatevirtual

Corrupt a packet according to the specified model.

Parameters

p	the packet to corrupt

Returns: true if the packet is corrupted

Implements ns3::ErrorModel.

Definition at line 361 of file error-model.cc.

References ns3::RandomVariableStream::GetInteger(), ns3::RandomVariableStream::GetValue(), ns3::ErrorModel::IsEnabled(), m_burstRate, m_burstSize, m_burstStart, m_counter, m_currentBurstSz, NS_LOG_DEBUG, NS_LOG_FUNCTION, and NS_LOG_WARN.

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◆ DoReset()

void ns3::BurstErrorModel::DoReset ( )

overrideprivatevirtual

Re-initialize any state.

Implements ns3::ErrorModel.

Definition at line 404 of file error-model.cc.

References m_counter, m_currentBurstSz, and NS_LOG_FUNCTION.

◆ GetBurstRate()

double ns3::BurstErrorModel::GetBurstRate ( ) const

Returns: the error rate being applied by the model

Definition at line 324 of file error-model.cc.

References m_burstRate, and NS_LOG_FUNCTION.

◆ GetTypeId()

TypeId ns3::BurstErrorModel::GetTypeId ( )

static

Get the type ID.

Returns: the object TypeId

Definition at line 287 of file error-model.cc.

References m_burstRate, m_burstSize, m_burstStart, ns3::MakeDoubleAccessor(), ns3::MakeDoubleChecker(), ns3::MakePointerAccessor(), ns3::MakePointerChecker(), and ns3::TypeId::SetParent().

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◆ SetBurstRate()

void ns3::BurstErrorModel::SetBurstRate ( double rate )

Parameters

rate	the error rate to be used by the model

Definition at line 331 of file error-model.cc.

References m_burstRate, and NS_LOG_FUNCTION.

◆ SetRandomBurstSize()

void ns3::BurstErrorModel::SetRandomBurstSize ( Ptr< RandomVariableStream > burstSz )

Parameters

burstSz A random variable distribution to generate random burst size

Definition at line 345 of file error-model.cc.

References m_burstSize, and NS_LOG_FUNCTION.

◆ SetRandomVariable()

void ns3::BurstErrorModel::SetRandomVariable ( Ptr< RandomVariableStream > ranVar )

Parameters

ranVar A random variable distribution to generate random variates

Definition at line 338 of file error-model.cc.

References m_burstStart, and NS_LOG_FUNCTION.

Member Data Documentation

◆ m_burstRate

double ns3::BurstErrorModel::m_burstRate

private

the burst error event

Definition at line 332 of file error-model.h.

Referenced by DoCorrupt(), GetBurstRate(), GetTypeId(), and SetBurstRate().

◆ m_burstSize

Ptr<RandomVariableStream> ns3::BurstErrorModel::m_burstSize

private

the number of packets being flagged as errored

Definition at line 334 of file error-model.h.

Referenced by AssignStreams(), DoCorrupt(), GetTypeId(), and SetRandomBurstSize().

◆ m_burstStart

Ptr<RandomVariableStream> ns3::BurstErrorModel::m_burstStart

private

the error decision variable

Definition at line 333 of file error-model.h.

Referenced by AssignStreams(), DoCorrupt(), GetTypeId(), and SetRandomVariable().

◆ m_counter

uint32_t ns3::BurstErrorModel::m_counter

private

keep track of the number of packets being errored until it reaches m_burstSize

Definition at line 340 of file error-model.h.

Referenced by DoCorrupt(), and DoReset().

◆ m_currentBurstSz

uint32_t ns3::BurstErrorModel::m_currentBurstSz

private

the current burst size

Definition at line 341 of file error-model.h.

Referenced by DoCorrupt(), and DoReset().

The documentation for this class was generated from the following files:

src/network/utils/error-model.h
src/network/utils/error-model.cc

Public Member Functions

Static Public Member Functions

Private Member Functions

Private Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ BurstErrorModel()

◆ ~BurstErrorModel()

Member Function Documentation

◆ AssignStreams()

◆ DoCorrupt()

◆ DoReset()

◆ GetBurstRate()

◆ GetTypeId()

◆ SetBurstRate()

◆ SetRandomBurstSize()

◆ SetRandomVariable()

Member Data Documentation

◆ m_burstRate

◆ m_burstSize

◆ m_burstStart

◆ m_counter

◆ m_currentBurstSz