The "Mean–Deviation" RTT estimator, as discussed by Van Jacobson. More...

#include <rtt-estimator.h>

Inheritance diagram for ns3::RttMeanDeviation:

Collaboration diagram for ns3::RttMeanDeviation:

Public Member Functions
	RttMeanDeviation ()
	RttMeanDeviation (const RttMeanDeviation &)
Ptr< RttEstimator >	Copy () const
void	Gain (double g)
	Sets the estimator Gain.
virtual TypeId	GetInstanceTypeId (void) const
void	Measurement (Time measure)
	Add a new measurement to the estimator.
void	Reset ()
	Resets sthe estimator.
Time	RetransmitTimeout ()
	Returns the estimated RTO.
Public Member Functions inherited from ns3::RttEstimator
	RttEstimator ()
	RttEstimator (const RttEstimator &)
virtual	~RttEstimator ()
virtual Time	AckSeq (SequenceNumber32 ackSeq)
	Note that a particular ack sequence has been received.
virtual void	ClearSent ()
	Clear all history entries.
Time	GetCurrentEstimate (void) const
	gets the current RTT estimate.
Time	GetMinRto (void) const
	Get the Minimum RTO.
virtual void	IncreaseMultiplier ()
	Increase the estimation multiplier up to MaxMultiplier.
virtual void	ResetMultiplier ()
	Resets the estimation multiplier to 1.
virtual void	SentSeq (SequenceNumber32 seq, uint32_t size)
	Note that a particular sequence has been sent.
void	SetCurrentEstimate (Time estimate)
	Sets the current RTT estimate (forcefully).
void	SetMinRto (Time minRto)
	Sets the Minimum RTO.
Public Member Functions inherited from ns3::Object
	Object ()
virtual	~Object ()
void	AggregateObject (Ptr< Object > other)
void	Dispose (void)
AggregateIterator	GetAggregateIterator (void) const
template<typename T >
Ptr< T >	GetObject (void) const
template<typename T >
Ptr< T >	GetObject (TypeId tid) const
void	Initialize (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)

Private Attributes
double	m_gain
Time	m_variance

Additional Inherited Members
Protected Member Functions inherited from ns3::Object
	Object (const Object &o)
virtual void	DoDispose (void)
virtual void	DoInitialize (void)
virtual void	NotifyNewAggregate (void)
Protected Attributes inherited from ns3::RttEstimator
Time	m_currentEstimatedRtt
Time	m_minRto
uint16_t	m_multiplier
uint32_t	m_nSamples

Detailed Description

The "Mean–Deviation" RTT estimator, as discussed by Van Jacobson.

This class implements the "Mean–Deviation" RTT estimator, as discussed by Van Jacobson and Michael J. Karels, in "Congestion Avoidance and Control", SIGCOMM 88, Appendix A

Doxygen introspection did not find any typical Config paths.

Attributes

Gain: Gain used in estimating the RTT, must be 0 < Gain < 1
- Set with class: ns3::DoubleValue
- Underlying type: double -1.79769e+308:1.79769e+308
- Initial value: 0.1
- Flags: construct write read

Attributes defined in parent class ns3::RttEstimator

MaxMultiplier: Maximum RTO Multiplier
- Set with class: ns3::UintegerValue
- Underlying type: uint16_t 0:65535
- Initial value: 64
- Flags: construct write read
InitialEstimation: Initial RTT estimation
- Set with class: TimeValue
- Underlying type: Time
- Initial value: +1000000000.0ns
- Flags: construct write read
MinRTO: Minimum retransmit timeout value
- Set with class: TimeValue
- Underlying type: Time
- Initial value: +200000000.0ns
- Flags: construct write read

No TraceSources are defined for this type.

Definition at line 164 of file rtt-estimator.h.

Constructor & Destructor Documentation

ns3::RttMeanDeviation::RttMeanDeviation ( )

Definition at line 251 of file rtt-estimator.cc.

References NS_LOG_FUNCTION.

ns3::RttMeanDeviation::RttMeanDeviation ( const RttMeanDeviation & c )

Definition at line 257 of file rtt-estimator.cc.

References NS_LOG_FUNCTION.

Member Function Documentation

Ptr< RttEstimator > ns3::RttMeanDeviation::Copy ( void ) const

virtual

Implements ns3::RttEstimator.

Definition at line 307 of file rtt-estimator.cc.

References NS_LOG_FUNCTION.

void ns3::RttMeanDeviation::Gain ( double g )

Sets the estimator Gain.

Parameters

g	the gain, where 0 < g < 1.

Definition at line 320 of file rtt-estimator.cc.

References m_gain, NS_ASSERT_MSG, and NS_LOG_FUNCTION.

TypeId ns3::RttMeanDeviation::GetInstanceTypeId ( void ) const

virtual

Returns: the TypeId associated to the most-derived type of this instance.

This method is typically implemented by ns3::Object::GetInstanceTypeId but some classes which derive from ns3::ObjectBase directly have to implement it themselves.

Reimplemented from ns3::RttEstimator.

Definition at line 264 of file rtt-estimator.cc.

References GetTypeId().

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