TCP-LP (Low Priority) congestion control algorithm. More...

#include "tcp-lp.h"

Inheritance diagram for ns3::TcpLp:

Collaboration diagram for ns3::TcpLp:

Public Member Functions
	TcpLp ()
	Creates an unbound tcp socket.

	TcpLp (const TcpLp &sock)
	Copy constructor.

	~TcpLp () override

Ptr< TcpCongestionOps >	Fork () override
	Copy the congestion control algorithm across sockets.

std::string	GetName () const override
	Get the name of the congestion control algorithm.

void	PktsAcked (Ptr< TcpSocketState > tcb, uint32_t segmentsAcked, const Time &rtt) override
	Timing information on received ACK.

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

	TcpNewReno (const TcpNewReno &sock)
	Copy constructor.

	~TcpNewReno () override

Ptr< TcpCongestionOps >	Fork () override
	Copy the congestion control algorithm across sockets.

std::string	GetName () const override
	Get the name of the congestion control algorithm.

uint32_t	GetSsThresh (Ptr< const TcpSocketState > tcb, uint32_t bytesInFlight) override
	Get the slow start threshold after a loss event.

void	IncreaseWindow (Ptr< TcpSocketState > tcb, uint32_t segmentsAcked) override
	Try to increase the cWnd following the NewReno specification.

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

	TcpCongestionOps (const TcpCongestionOps &other)
	Copy constructor.

	~TcpCongestionOps () override

virtual void	CongControl (Ptr< TcpSocketState > tcb, const TcpRateOps::TcpRateConnection &rc, const TcpRateOps::TcpRateSample &rs)
	Called when packets are delivered to update cwnd and pacing rate.

virtual void	CongestionStateSet (Ptr< TcpSocketState > tcb, const TcpSocketState::TcpCongState_t newState)
	Trigger events/calculations specific to a congestion state.

virtual void	CwndEvent (Ptr< TcpSocketState > tcb, const TcpSocketState::TcpCAEvent_t event)
	Trigger events/calculations on occurrence of congestion window event.

virtual bool	HasCongControl () const
	Returns true when Congestion Control Algorithm implements CongControl.

virtual void	Init (Ptr< TcpSocketState > tcb)
	Set configuration required by congestion control algorithm.

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::TcpNewReno
static TypeId	GetTypeId ()
	Get the type ID.

Static Public Member Functions inherited from ns3::TcpCongestionOps
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.

Protected Member Functions
void	CongestionAvoidance (Ptr< TcpSocketState > tcb, uint32_t segmentsAcked) override
	Invokes Congestion Avoidance of TcpNewReno if TcpLp is not within inference.

Protected Member Functions inherited from ns3::TcpNewReno
virtual uint32_t	SlowStart (Ptr< TcpSocketState > tcb, uint32_t segmentsAcked)
	Tcp NewReno slow start algorithm.

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.

Private Types
enum	State { LP_VALID_OWD = (1 << 1) , LP_WITHIN_THR = (1 << 3) , LP_WITHIN_INF = (1 << 4) }
	Describes the state of TcpLp. More...

Private Member Functions
uint32_t	OwdCalculator (Ptr< TcpSocketState > tcb)
	Calculates One-Way Delay using Sender and Receiver timestamps.

void	RttSample (Ptr< TcpSocketState > tcb)
	Estimates minimum and maximum One-Way Delays and calculates the smoothed One-Way Delay.

Private Attributes
uint32_t	m_flag
	TcpLp state flag.

Time	m_inference
	Current inference period.

Time	m_lastDrop
	Last time when cwnd was reduced.

uint32_t	m_owdMax
	Maximum One-Way Delay.

uint32_t	m_owdMaxRsv
	Reserved Maximum One-Way Delay.

uint32_t	m_owdMin
	Minimum One-Way Delay.

uint32_t	m_sOwd
	Smoothed One-Way Delay.

Additional Inherited Members
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

TCP-LP (Low Priority) congestion control algorithm.

Definition at line 29 of file tcp-lp.h.

Member Enumeration Documentation

◆ State

enum ns3::TcpLp::State

private

Describes the state of TcpLp.

Enumerator
LP_VALID_OWD	Calculated One-Way Delay is valid.
LP_WITHIN_THR	TcpLp is within Threshold.
LP_WITHIN_INF	TcpLp is within Inference.

Definition at line 84 of file tcp-lp.h.

Constructor & Destructor Documentation

◆ TcpLp() [1/2]

ns3::TcpLp::TcpLp ( )

Creates an unbound tcp socket.

Definition at line 33 of file tcp-lp.cc.

References NS_LOG_FUNCTION.

◆ TcpLp() [2/2]

ns3::TcpLp::TcpLp ( const TcpLp & sock )

Copy constructor.

Parameters

sock	the object to copy

Definition at line 46 of file tcp-lp.cc.

References NS_LOG_FUNCTION.

◆ ~TcpLp()

ns3::TcpLp::~TcpLp ( )

override

Definition at line 59 of file tcp-lp.cc.

References NS_LOG_FUNCTION.

Member Function Documentation

◆ CongestionAvoidance()

void ns3::TcpLp::CongestionAvoidance	(	Ptr< TcpSocketState >	tcb,
		uint32_t	segmentsAcked )

overrideprotectedvirtual

Invokes Congestion Avoidance of TcpNewReno if TcpLp is not within inference.

Parameters

tcb	internal congestion state
segmentsAcked	count of segments acked

Reimplemented from ns3::TcpNewReno.

Definition at line 71 of file tcp-lp.cc.

References ns3::TcpNewReno::CongestionAvoidance(), LP_WITHIN_INF, m_flag, and NS_LOG_FUNCTION.

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◆ Fork()

Ptr< TcpCongestionOps > ns3::TcpLp::Fork ( )

overridevirtual

Copy the congestion control algorithm across sockets.

Returns: a pointer of the copied object

Implements ns3::TcpCongestionOps.

Definition at line 65 of file tcp-lp.cc.

References ns3::Object::CopyObject.

◆ GetName()

std::string ns3::TcpLp::GetName ( ) const

overridevirtual

Get the name of the congestion control algorithm.

Returns: A string identifying the name

Implements ns3::TcpCongestionOps.

Definition at line 220 of file tcp-lp.cc.

◆ GetTypeId()

TypeId ns3::TcpLp::GetTypeId ( )

static

Get the type ID.

Returns: the object TypeId

Definition at line 24 of file tcp-lp.cc.

References ns3::TypeId::SetParent().

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◆ OwdCalculator()

uint32_t ns3::TcpLp::OwdCalculator ( Ptr< TcpSocketState > tcb )

private

Calculates One-Way Delay using Sender and Receiver timestamps.

Parameters

tcb	internal congestion state

Returns: One-Way Delay

Definition at line 82 of file tcp-lp.cc.

References LP_VALID_OWD, m_flag, and NS_LOG_FUNCTION.

Referenced by RttSample().

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◆ PktsAcked()

void ns3::TcpLp::PktsAcked	(	Ptr< TcpSocketState >	tcb,
		uint32_t	segmentsAcked,
		const Time &	rtt )

overridevirtual

Timing information on received ACK.

The function is called every time an ACK is received. It determines the state of TcpLp and adjusts the congestion window accordingly.

Parameters

tcb	internal congestion state
segmentsAcked	count of segments acked
rtt	last rtt

Reimplemented from ns3::TcpCongestionOps.

Definition at line 156 of file tcp-lp.cc.

References ns3::Time::GetMilliSeconds(), ns3::Time::IsZero(), LP_WITHIN_INF, LP_WITHIN_THR, m_flag, m_inference, m_lastDrop, m_owdMax, m_owdMaxRsv, m_owdMin, m_sOwd, ns3::MilliSeconds(), ns3::Simulator::Now(), NS_LOG_FUNCTION, and RttSample().

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◆ RttSample()

void ns3::TcpLp::RttSample ( Ptr< TcpSocketState > tcb )

private

Estimates minimum and maximum One-Way Delays and calculates the smoothed One-Way Delay.

Parameters

tcb	internal congestion state

Definition at line 106 of file tcp-lp.cc.

References LP_VALID_OWD, m_flag, m_owdMax, m_owdMaxRsv, m_owdMin, m_sOwd, NS_LOG_FUNCTION, and OwdCalculator().

Referenced by PktsAcked().

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Member Data Documentation

◆ m_flag

uint32_t ns3::TcpLp::m_flag

private

TcpLp state flag.

Definition at line 91 of file tcp-lp.h.

Referenced by CongestionAvoidance(), OwdCalculator(), PktsAcked(), and RttSample().

◆ m_inference

Time ns3::TcpLp::m_inference

private

Current inference period.

Definition at line 97 of file tcp-lp.h.

Referenced by PktsAcked().

◆ m_lastDrop

Time ns3::TcpLp::m_lastDrop

private

Last time when cwnd was reduced.

Definition at line 96 of file tcp-lp.h.

Referenced by PktsAcked().

◆ m_owdMax

uint32_t ns3::TcpLp::m_owdMax

private

Maximum One-Way Delay.

Definition at line 94 of file tcp-lp.h.

Referenced by PktsAcked(), and RttSample().

◆ m_owdMaxRsv

uint32_t ns3::TcpLp::m_owdMaxRsv

private

Reserved Maximum One-Way Delay.

Definition at line 95 of file tcp-lp.h.

Referenced by PktsAcked(), and RttSample().

◆ m_owdMin

uint32_t ns3::TcpLp::m_owdMin

private

Minimum One-Way Delay.

Definition at line 93 of file tcp-lp.h.

Referenced by PktsAcked(), and RttSample().

◆ m_sOwd

uint32_t ns3::TcpLp::m_sOwd

private

Smoothed One-Way Delay.

Definition at line 92 of file tcp-lp.h.

Referenced by PktsAcked(), and RttSample().

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

src/internet/model/tcp-lp.h
src/internet/model/tcp-lp.cc

Public Member Functions

Static Public Member Functions

Protected Member Functions

Private Types

Private Member Functions

Private Attributes

Additional Inherited Members

Detailed Description

Member Enumeration Documentation

◆ State

Constructor & Destructor Documentation

◆ TcpLp() [1/2]

◆ TcpLp() [2/2]

◆ ~TcpLp()

Member Function Documentation

◆ CongestionAvoidance()

◆ Fork()

◆ GetName()

◆ GetTypeId()

◆ OwdCalculator()

◆ PktsAcked()

◆ RttSample()

Member Data Documentation

◆ m_flag

◆ m_inference

◆ m_lastDrop

◆ m_owdMax

◆ m_owdMaxRsv

◆ m_owdMin

◆ m_sOwd