An implementation of LEDBAT. More...

#include "tcp-ledbat.h"

Inheritance diagram for ns3::TcpLedbat:

Collaboration diagram for ns3::TcpLedbat:

Classes
struct	OwdCircBuf
	Buffer structure to store delays. More...

Public Member Functions
	TcpLedbat ()
	Create an unbound tcp socket.

	TcpLedbat (const TcpLedbat &sock)
	Copy constructor.

	~TcpLedbat () override
	Destructor.

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

std::string	GetName () const override
	Get the name of the TCP flavour.

void	IncreaseWindow (Ptr< TcpSocketState > tcb, uint32_t segmentsAcked) override
	Adjust cwnd following LEDBAT algorithm.

void	PktsAcked (Ptr< TcpSocketState > tcb, uint32_t segmentsAcked, const Time &rtt) override
	Get information from the acked packet.

void	SetDoSs (SlowStartType doSS)
	Change the Slow Start Capability.

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.

virtual void	SetRateOps (Ptr< TcpRateOps > rateOps)
	Set rate operation required by the 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 final
	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
	Reduce Congestion.

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
typedef uint32_t(*	FilterFunction) (OwdCircBuf &)
	Filter function used by LEDBAT for current delay.

enum	SlowStartType { DO_NOT_SLOWSTART , DO_SLOWSTART }
	The slowstart types. More...

enum	State : uint32_t { LEDBAT_VALID_OWD = (1 << 1) , LEDBAT_CAN_SS = (1 << 3) }
	The state of LEDBAT. More...

Private Member Functions
void	AddDelay (OwdCircBuf &cb, uint32_t owd, uint32_t maxlen)
	Add new delay to the buffers.

uint32_t	BaseDelay ()
	Return the value of base delay.

uint32_t	CurrentDelay (FilterFunction filter)
	Return the value of current delay.

void	InitCircBuf (OwdCircBuf &buffer)
	Initialise a new buffer.

void	UpdateBaseDelay (uint32_t owd)
	Update the base delay buffer.

Static Private Member Functions
static uint32_t	MinCircBuf (OwdCircBuf &b)
	Return the minimum delay of the buffer.

Private Attributes
uint32_t	m_baseHistoLen
	Length of base delay history buffer.

OwdCircBuf	m_baseHistory
	Buffer to store the base delay.

SlowStartType	m_doSs
	Permissible Slow Start State.

uint32_t	m_flag
	LEDBAT Flag.

double	m_gain
	GAIN value from RFC.

uint64_t	m_lastRollover
	Timestamp of last added delay.

uint32_t	m_minCwnd
	Minimum cWnd value mentioned in RFC 6817.

OwdCircBuf	m_noiseFilter
	Buffer to store the current delay.

uint32_t	m_noiseFilterLen
	Length of current delay buffer.

int32_t	m_sndCwndCnt
	The congestion window addition parameter.

Time	m_target
	Target Queue 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

An implementation of LEDBAT.

Config Paths

ns3::TcpLedbat is accessible through the following paths with Config::Set and Config::Connect:

"/NodeList/[i]/$ns3::TcpL4Protocol/SocketList/[i]/CongestionOps/$ns3::TcpNewReno/$ns3::TcpLedbat"
"/NodeList/[i]/$ns3::TcpL4Protocol/SocketList/[i]/CongestionOps/$ns3::TcpLedbat"

Attributes

BaseHistoryLen: Number of Base delay samples
- Set with class: ns3::UintegerValue
- Underlying type: uint32_t 0:4294967295
- Initial value: 10
- Flags: constructwriteread
- Support level: SUPPORTED
Gain: Offset Gain
- Set with class: ns3::DoubleValue
- Underlying type: double -1.79769e+308:1.79769e+308
- Initial value: 1
- Flags: constructwriteread
- Support level: SUPPORTED
MinCwnd: Minimum cWnd for Ledbat
- Set with class: ns3::UintegerValue
- Underlying type: uint32_t 0:4294967295
- Initial value: 2
- Flags: constructwriteread
- Support level: SUPPORTED
NoiseFilterLen: Number of Current delay samples
- Set with class: ns3::UintegerValue
- Underlying type: uint32_t 0:4294967295
- Initial value: 4
- Flags: constructwriteread
- Support level: SUPPORTED
SSParam: Possibility of Slow Start
- Set with class: ns3::EnumValue<ns3::TcpLedbat::SlowStartType>
- Underlying type: yes|no
- Initial value: yes
- Flags: constructwrite
- Support level: SUPPORTED
TargetDelay: Targeted Queue Delay
- Set with class: ns3::TimeValue
- Underlying type: Time -9.22337e+18ns:+9.22337e+18ns
- Initial value: +1e+08ns
- Flags: constructwriteread
- Support level: SUPPORTED

Attributes defined in parent class ns3::TcpNewReno

BetaEcn: Beta for multiplicative decrease for ABE
- Set with class: ns3::DoubleValue
- Underlying type: double 0:1
- Initial value: 0.7
- Flags: constructwriteread
- Support level: SUPPORTED
BetaLoss: Beta for multiplicative decrease
- Set with class: ns3::DoubleValue
- Underlying type: double 0:1
- Initial value: 0.5
- Flags: constructwriteread
- Support level: SUPPORTED

No TraceSources are defined for this type
Group: Internet
Size of this type is 192 bytes (on a 64-bit architecture).

Definition at line 28 of file tcp-ledbat.h.

Member Typedef Documentation

◆ FilterFunction

typedef uint32_t(* ns3::TcpLedbat::FilterFunction) (OwdCircBuf &)

private

Filter function used by LEDBAT for current delay.

Definition at line 134 of file tcp-ledbat.h.

Member Enumeration Documentation

◆ SlowStartType

enum ns3::TcpLedbat::SlowStartType

private

The slowstart types.

Enumerator
DO_NOT_SLOWSTART	Do not Slow Start.
DO_SLOWSTART	Do NewReno Slow Start.

Definition at line 34 of file tcp-ledbat.h.

◆ State

enum ns3::TcpLedbat::State : uint32_t

private

The state of LEDBAT.

If LEDBAT is not in VALID_OWD state, it falls to default congestion ops.

Enumerator
LEDBAT_VALID_OWD	If valid timestamps are present.
LEDBAT_CAN_SS	If LEDBAT allows Slow Start.

Definition at line 44 of file tcp-ledbat.h.

Constructor & Destructor Documentation

◆ TcpLedbat() [1/2]

ns3::TcpLedbat::TcpLedbat ( )

Create an unbound tcp socket.

Definition at line 79 of file tcp-ledbat.cc.

References ns3::TcpNewReno::TcpNewReno(), DO_SLOWSTART, InitCircBuf(), LEDBAT_CAN_SS, m_baseHistoLen, m_baseHistory, m_doSs, m_flag, m_gain, m_lastRollover, m_minCwnd, m_noiseFilter, m_noiseFilterLen, m_sndCwndCnt, m_target, ns3::MilliSeconds(), and NS_LOG_FUNCTION.

Referenced by TcpLedbat().

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◆ TcpLedbat() [2/2]

ns3::TcpLedbat::TcpLedbat ( const TcpLedbat & sock )

Copy constructor.

Parameters

sock	the object to copy

Definition at line 104 of file tcp-ledbat.cc.

References TcpLedbat(), ns3::TcpNewReno::TcpNewReno(), m_baseHistoLen, m_baseHistory, m_doSs, m_flag, m_gain, m_lastRollover, m_minCwnd, m_noiseFilter, m_noiseFilterLen, m_sndCwndCnt, m_target, and NS_LOG_FUNCTION.

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◆ ~TcpLedbat()

ns3::TcpLedbat::~TcpLedbat ( )

override

Destructor.

Definition at line 121 of file tcp-ledbat.cc.

References NS_LOG_FUNCTION.

Member Function Documentation

◆ AddDelay()

void ns3::TcpLedbat::AddDelay	(	OwdCircBuf &	cb,
		uint32_t	owd,
		uint32_t	maxlen )

private

Add new delay to the buffers.

Parameters

cb	The buffer
owd	The new delay
maxlen	The maximum permitted length

Definition at line 231 of file tcp-ledbat.cc.

References ns3::TcpLedbat::OwdCircBuf::buffer, ns3::TcpLedbat::OwdCircBuf::min, NS_LOG_FUNCTION, and NS_LOG_LOGIC.

Referenced by PktsAcked(), and UpdateBaseDelay().

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◆ BaseDelay()

uint32_t ns3::TcpLedbat::BaseDelay ( )

private

Return the value of base delay.

Returns: The base delay

Definition at line 160 of file tcp-ledbat.cc.

References m_baseHistory, MinCircBuf(), and NS_LOG_FUNCTION.

Referenced by CongestionAvoidance().

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◆ CongestionAvoidance()

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

overrideprotectedvirtual

Reduce Congestion.

Parameters

tcb	internal congestion state
segmentsAcked	count of segments ACKed

Reimplemented from ns3::TcpNewReno.

Definition at line 186 of file tcp-ledbat.cc.

References BaseDelay(), ns3::TcpNewReno::CongestionAvoidance(), CurrentDelay(), LEDBAT_VALID_OWD, m_flag, m_gain, m_minCwnd, m_sndCwndCnt, m_target, MinCircBuf(), and NS_LOG_FUNCTION.

Referenced by IncreaseWindow().

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◆ CurrentDelay()

uint32_t ns3::TcpLedbat::CurrentDelay ( FilterFunction filter )

private

Return the value of current delay.

Parameters

filter The filter function

Returns: The current delay

Definition at line 153 of file tcp-ledbat.cc.

References m_noiseFilter, and NS_LOG_FUNCTION.

Referenced by CongestionAvoidance().

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◆ Fork()

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

overridevirtual

Copy the congestion control algorithm across sockets.

Returns: a pointer of the copied object

Implements ns3::TcpCongestionOps.

Definition at line 127 of file tcp-ledbat.cc.

References ns3::CopyObject().

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◆ GetName()

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

overridevirtual

Get the name of the TCP flavour.

Returns: The name of the TCP

Implements ns3::TcpCongestionOps.

Definition at line 133 of file tcp-ledbat.cc.

◆ GetTypeId()

TypeId ns3::TcpLedbat::GetTypeId ( )

static

Get the type ID.

Returns: the object TypeId

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

References ns3::TcpNewReno::TcpNewReno(), DO_NOT_SLOWSTART, DO_SLOWSTART, m_baseHistoLen, m_gain, m_minCwnd, m_noiseFilterLen, m_target, ns3::MakeDoubleAccessor(), ns3::MakeDoubleChecker(), ns3::MakeEnumAccessor(), ns3::MakeEnumChecker(), ns3::MakeTimeAccessor(), ns3::MakeTimeChecker(), ns3::MakeUintegerAccessor(), ns3::MakeUintegerChecker(), ns3::MilliSeconds(), SetDoSs(), and ns3::TypeId::SetParent().

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◆ IncreaseWindow()

void ns3::TcpLedbat::IncreaseWindow	(	Ptr< TcpSocketState >	tcb,
		uint32_t	segmentsAcked )

overridevirtual

Adjust cwnd following LEDBAT algorithm.

Parameters

tcb	internal congestion state
segmentsAcked	count of segments ACKed

Reimplemented from ns3::TcpCongestionOps.

Definition at line 167 of file tcp-ledbat.cc.

References CongestionAvoidance(), DO_SLOWSTART, LEDBAT_CAN_SS, m_doSs, m_flag, NS_LOG_FUNCTION, and ns3::TcpNewReno::SlowStart().

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◆ InitCircBuf()

void ns3::TcpLedbat::InitCircBuf ( OwdCircBuf & buffer )

private

Initialise a new buffer.

Parameters

buffer The buffer to be initialised

Definition at line 97 of file tcp-ledbat.cc.

References ns3::TcpLedbat::OwdCircBuf::buffer, ns3::TcpLedbat::OwdCircBuf::min, and NS_LOG_FUNCTION.

Referenced by TcpLedbat().

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◆ MinCircBuf()

uint32_t ns3::TcpLedbat::MinCircBuf ( OwdCircBuf & b )

staticprivate

Return the minimum delay of the buffer.

Parameters

b	The buffer

Returns: The minimum delay

Definition at line 139 of file tcp-ledbat.cc.

References ns3::TcpLedbat::OwdCircBuf::buffer, ns3::TcpLedbat::OwdCircBuf::min, and NS_LOG_FUNCTION_NOARGS.

Referenced by BaseDelay(), and CongestionAvoidance().

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◆ PktsAcked()

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

overridevirtual

Get information from the acked packet.

Parameters

tcb	internal congestion state
segmentsAcked	count of segments ACKed
rtt	The estimated rtt

Reimplemented from ns3::TcpCongestionOps.

Definition at line 293 of file tcp-ledbat.cc.

References AddDelay(), ns3::Time::IsPositive(), LEDBAT_VALID_OWD, m_flag, m_noiseFilter, m_noiseFilterLen, NS_LOG_FUNCTION, and UpdateBaseDelay().

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◆ SetDoSs()

void ns3::TcpLedbat::SetDoSs ( SlowStartType doSS )

Change the Slow Start Capability.

Parameters

doSS	Slow Start Option

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

References LEDBAT_CAN_SS, m_doSs, m_flag, and NS_LOG_FUNCTION.

Referenced by GetTypeId().

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◆ UpdateBaseDelay()

void ns3::TcpLedbat::UpdateBaseDelay ( uint32_t owd )

private

Update the base delay buffer.

Parameters

owd The delay

Definition at line 263 of file tcp-ledbat.cc.

References AddDelay(), ns3::Time::GetSeconds(), m_baseHistoLen, m_baseHistory, m_lastRollover, ns3::Simulator::Now(), and NS_LOG_FUNCTION.

Referenced by PktsAcked().

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Member Data Documentation

◆ m_baseHistoLen

uint32_t ns3::TcpLedbat::m_baseHistoLen

private

Length of base delay history buffer.

Definition at line 178 of file tcp-ledbat.h.

Referenced by TcpLedbat(), TcpLedbat(), GetTypeId(), and UpdateBaseDelay().

◆ m_baseHistory

OwdCircBuf ns3::TcpLedbat::m_baseHistory

private

Buffer to store the base delay.

Definition at line 182 of file tcp-ledbat.h.

Referenced by TcpLedbat(), TcpLedbat(), BaseDelay(), and UpdateBaseDelay().

◆ m_doSs

SlowStartType ns3::TcpLedbat::m_doSs

private

Permissible Slow Start State.

Definition at line 177 of file tcp-ledbat.h.

Referenced by TcpLedbat(), TcpLedbat(), IncreaseWindow(), and SetDoSs().

◆ m_flag

uint32_t ns3::TcpLedbat::m_flag

private

LEDBAT Flag.

Definition at line 184 of file tcp-ledbat.h.

Referenced by TcpLedbat(), TcpLedbat(), CongestionAvoidance(), IncreaseWindow(), PktsAcked(), and SetDoSs().

◆ m_gain

double ns3::TcpLedbat::m_gain

private

GAIN value from RFC.

Definition at line 176 of file tcp-ledbat.h.

Referenced by TcpLedbat(), TcpLedbat(), CongestionAvoidance(), and GetTypeId().

◆ m_lastRollover

uint64_t ns3::TcpLedbat::m_lastRollover

private

Timestamp of last added delay.

Definition at line 180 of file tcp-ledbat.h.

Referenced by TcpLedbat(), TcpLedbat(), and UpdateBaseDelay().

◆ m_minCwnd

uint32_t ns3::TcpLedbat::m_minCwnd

private

Minimum cWnd value mentioned in RFC 6817.

Definition at line 185 of file tcp-ledbat.h.

Referenced by TcpLedbat(), TcpLedbat(), CongestionAvoidance(), and GetTypeId().

◆ m_noiseFilter

OwdCircBuf ns3::TcpLedbat::m_noiseFilter

private

Buffer to store the current delay.

Definition at line 183 of file tcp-ledbat.h.

Referenced by TcpLedbat(), TcpLedbat(), CurrentDelay(), and PktsAcked().

◆ m_noiseFilterLen

uint32_t ns3::TcpLedbat::m_noiseFilterLen

private

Length of current delay buffer.

Definition at line 179 of file tcp-ledbat.h.

Referenced by TcpLedbat(), TcpLedbat(), GetTypeId(), and PktsAcked().

◆ m_sndCwndCnt

int32_t ns3::TcpLedbat::m_sndCwndCnt

private

The congestion window addition parameter.

Definition at line 181 of file tcp-ledbat.h.

Referenced by TcpLedbat(), TcpLedbat(), and CongestionAvoidance().

◆ m_target

Time ns3::TcpLedbat::m_target

private

Target Queue Delay.

Definition at line 175 of file tcp-ledbat.h.

Referenced by TcpLedbat(), TcpLedbat(), CongestionAvoidance(), and GetTypeId().

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

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

Classes

Public Member Functions

Static Public Member Functions

Protected Member Functions

Private Types

Private Member Functions

Static Private Member Functions

Private Attributes

Additional Inherited Members

Detailed Description

Config Paths

Attributes

Attributes defined in parent class ns3::TcpNewReno

Member Typedef Documentation

◆ FilterFunction

Member Enumeration Documentation

◆ SlowStartType

◆ State

Constructor & Destructor Documentation

◆ TcpLedbat() [1/2]

◆ TcpLedbat() [2/2]

◆ ~TcpLedbat()

Member Function Documentation

◆ AddDelay()

◆ BaseDelay()

◆ CongestionAvoidance()

◆ CurrentDelay()

◆ Fork()

◆ GetName()

◆ GetTypeId()

◆ IncreaseWindow()

◆ InitCircBuf()

◆ MinCircBuf()

◆ PktsAcked()

◆ SetDoSs()

◆ UpdateBaseDelay()

Member Data Documentation

◆ m_baseHistoLen

◆ m_baseHistory

◆ m_doSs

◆ m_flag

◆ m_gain

◆ m_lastRollover

◆ m_minCwnd

◆ m_noiseFilter

◆ m_noiseFilterLen

◆ m_sndCwndCnt

◆ m_target