An implementation of the H-TCP variant of TCP. More...

#include "tcp-htcp.h"

Inheritance diagram for ns3::TcpHtcp:

Collaboration diagram for ns3::TcpHtcp:

Public Member Functions
	TcpHtcp (void)
	Create an unbound tcp socket. More...

	TcpHtcp (const TcpHtcp &sock)
	Copy constructor. More...

virtual	~TcpHtcp (void)

virtual Ptr< TcpCongestionOps >	Fork ()
	Copy the congestion control algorithm across socket. More...

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

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

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

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

	TcpNewReno (const TcpNewReno &sock)
	Copy constructor. More...

	~TcpNewReno ()

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

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

	TcpCongestionOps (const TcpCongestionOps &other)
	Copy constructor. More...

virtual	~TcpCongestionOps ()

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

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

virtual	~Object ()
	Destructor. More...

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

void	Dispose (void)
	Dispose of this Object. More...

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

virtual TypeId	GetInstanceTypeId (void) const
	Get the most derived TypeId for this Object. More...

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

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

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

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

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

	SimpleRefCount (const SimpleRefCount &o)
	Copy constructor. More...

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

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

void	Ref (void) const
	Increment the reference count. More...

void	Unref (void) const
	Decrement the reference count. More...

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Protected Member Functions
virtual void	CongestionAvoidance (Ptr< TcpSocketState > tcb, uint32_t segmentsAcked)
	NewReno congestion avoidance. More...

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

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

virtual void	DoDispose (void)
	Destructor implementation. More...

virtual void	DoInitialize (void)
	Initialize() implementation. More...

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

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

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

Private Member Functions
void	UpdateAlpha (void)
	Updates the additive increase parameter for H-TCP. More...

void	UpdateBeta (void)
	Updates the multiplicative decrease factor beta for H-TCP. More...

Private Attributes
double	m_alpha
	AIMD additive increase parameter. More...

double	m_beta
	AIMD multiplicative decrease factor. More...

uint32_t	m_dataSent
	Current amount of data sent since last congestion. More...

double	m_defaultBackoff
	default value when throughput ratio less than default More...

Time	m_delta
	Time in second that has elapsed since the. More...

Time	m_deltaL
	Threshold for switching between standard and new increase function. More...

Time	m_lastCon
	Time of the last congestion for the flow. More...

uint32_t	m_lastThroughput
	Throughput in last congestion period. More...

Time	m_maxRtt
	Maximum RTT in each congestion period. More...

Time	m_minRtt
	Minimum RTT in each congestion period. More...

uint32_t	m_throughput
	Current throughput since last congestion. More...

double	m_throughputRatio
	ratio of two consequence throughput More...

Additional Inherited Members
Related Functions inherited from ns3::ObjectBase
static TypeId	GetObjectIid (void)
	Ensure the TypeId for ObjectBase gets fully configured to anchor the inheritance tree properly. More...

Detailed Description

An implementation of the H-TCP variant of TCP.

Introspection did not find any typical Config paths.

This class contains the H-TCP implementation of TCP, according to Internet-Draft draft-leith-tcp-htcp-03 and its related paper, "H-TCP: TCP for high-speed and long-distance networks" H-TCP is a congestion control protocol suitable for high bandwidth-delay product networks. It is fair to similar flows present in the network and also friendly with conventional TCP. It also makes use of free bandwidth when it is available.

Attributes

DefaultBackoff: The default AIMD backoff factor
- Set with class: ns3::DoubleValue
- Underlying type: double 0:1
- Initial value: 0.5
- Flags: construct write read
ThroughputRatio: Threshold value for updating beta
- Set with class: ns3::DoubleValue
- Underlying type: double -1.79769e+308:1.79769e+308
- Initial value: 0.2
- Flags: construct write read
DeltaL: Delta_L parameter in increase function
- Set with class: ns3::TimeValue
- Underlying type: Time –9223372036854775808.0ns:+9223372036854775807.0ns
- Initial value: +1000000000.0ns
- Flags: construct write read

No TraceSources are defined for this type.
Size of this type is 120 bytes (on a 64-bit architecture).

Definition at line 49 of file tcp-htcp.h.

Constructor & Destructor Documentation

ns3::TcpHtcp::TcpHtcp ( void )

Create an unbound tcp socket.

Definition at line 76 of file tcp-htcp.cc.

References NS_LOG_FUNCTION.

ns3::TcpHtcp::TcpHtcp ( const TcpHtcp & sock )

Copy constructor.

Parameters

sock	the object to copy

Definition at line 91 of file tcp-htcp.cc.

References NS_LOG_FUNCTION.

ns3::TcpHtcp::~TcpHtcp ( void )

virtual

Definition at line 109 of file tcp-htcp.cc.

References NS_LOG_FUNCTION.

Member Function Documentation

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

protectedvirtual

NewReno congestion avoidance.

During congestion avoidance, cwnd is incremented by roughly 1 full-sized segment per round-trip time (RTT).

Parameters

tcb	internal congestion state
segmentsAcked	count of segments acked

Reimplemented from ns3::TcpNewReno.

Definition at line 120 of file tcp-htcp.cc.

References m_alpha, ns3::TcpSocketState::m_cWnd, ns3::TcpSocketState::m_segmentSize, ns3::TcpSocketState::m_ssThresh, max, NS_LOG_FUNCTION, and NS_LOG_INFO.

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

virtual

Copy the congestion control algorithm across socket.

Returns: a pointer of the copied object

Reimplemented from ns3::TcpNewReno.

Definition at line 114 of file tcp-htcp.cc.

References NS_LOG_FUNCTION.

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

virtual

Get the name of the congestion control algorithm.

Returns: A string identifying the name

Reimplemented from ns3::TcpNewReno.

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

uint32_t ns3::TcpHtcp::GetSsThresh	(	Ptr< const TcpSocketState >	tcb,
		uint32_t	bytesInFlight
	)

virtual

Get the slow start threshold after a loss event.

Is guaranteed that the congestion control state (TcpAckState_t) is changed BEFORE the invocation of this method. The implementator should return the slow start threshold (and not change it directly) because, in the future, the TCP implementation may require to instantly recover from a loss event (e.g. when there is a network with an high reordering factor).

Parameters

tcb	internal congestion state
bytesInFlight	total bytes in flight

Returns: Slow start threshold

Reimplemented from ns3::TcpNewReno.

Definition at line 178 of file tcp-htcp.cc.

References m_beta, m_dataSent, m_lastCon, m_lastThroughput, m_maxRtt, m_minRtt, m_throughput, max, ns3::Time::Max(), ns3::Time::Min(), ns3::Simulator::Now(), NS_LOG_DEBUG, NS_LOG_FUNCTION, UpdateAlpha(), and UpdateBeta().

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TypeId ns3::TcpHtcp::GetTypeId ( void )

static

Get the type ID.

Returns: the object TypeId

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

References m_defaultBackoff, m_deltaL, m_throughputRatio, ns3::MakeDoubleAccessor(), ns3::MakeTimeAccessor(), ns3::MakeTimeChecker(), ns3::Seconds(), and ns3::TypeId::SetParent().

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

virtual

Timing information on received ACK.

The function is called every time an ACK is received (only one time also for cumulative ACKs) and contains timing information. It is optional (congestion controls can not implement it) and the default implementation does nothing.

Parameters