A Discrete-Event Network Simulator
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tcp-highspeed.h
Go to the documentation of this file.
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/*
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* Copyright (c) 2014 Natale Patriciello, <natale.patriciello@gmail.com>
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*
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* SPDX-License-Identifier: GPL-2.0-only
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*
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*/
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#ifndef TCPHIGHSPEED_H
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#define TCPHIGHSPEED_H
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#include "
tcp-congestion-ops.h
"
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namespace
ns3
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{
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class
TcpSocketState;
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/**
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* \ingroup congestionOps
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*
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* \brief An implementation of TCP HighSpeed
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*
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* TCP HighSpeed is designed for high-capacity channels or, in general, for
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* TCP connections with large congestion windows.
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* Conceptually, with respect to the standard TCP, HighSpeed makes the
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* cWnd grow faster during the probing phases and accelerates the
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* cWnd recovery from losses.
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* This behavior is executed only when the window grows beyond a
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* certain threshold, which allows TCP Highspeed to be friendly with standard
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* TCP in environments with heavy congestion, without introducing new dangers
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* of congestion collapse.
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* At the core of TCP HighSpeed there are two functions, a(w) and b(w), which respectively
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* specify the cWnd growth addendum and the cWnd reduction factor when
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* given an actual cWnd value w.
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*
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* More information: http://dl.acm.org/citation.cfm?id=2756518
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*/
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class
TcpHighSpeed
:
public
TcpNewReno
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{
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public
:
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/**
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* \brief Get the type ID.
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* \return the object TypeId
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*/
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static
TypeId
GetTypeId
();
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/**
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* Create an unbound tcp socket.
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*/
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TcpHighSpeed
();
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/**
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* \brief Copy constructor
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* \param sock the object to copy
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*/
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TcpHighSpeed
(
const
TcpHighSpeed
& sock);
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~TcpHighSpeed
()
override
;
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std::string
GetName
()
const override
;
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uint32_t
GetSsThresh
(
Ptr<const TcpSocketState>
tcb,
uint32_t
bytesInFlight)
override
;
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Ptr<TcpCongestionOps>
Fork
()
override
;
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/**
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* \brief Lookup table for the coefficient a (from RFC 3649)
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*
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* \param w Window value (in packets)
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*
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* \return the coefficient a
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*/
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static
uint32_t
TableLookupA
(
uint32_t
w);
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/**
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* \brief Lookup table for the coefficient b (from RFC 3649)
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*
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* \param w Window value (in packets)
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*
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* \return the coefficient b
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*/
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static
double
TableLookupB
(
uint32_t
w);
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protected
:
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void
CongestionAvoidance
(
Ptr<TcpSocketState>
tcb,
uint32_t
segmentsAcked)
override
;
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private
:
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uint32_t
m_ackCnt
;
//!< Number of received ACK, corrected with the coefficient a
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};
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}
// namespace ns3
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#endif
// TCPHIGHSPEED_H
ns3::Ptr
Smart pointer class similar to boost::intrusive_ptr.
Definition
mpi-test-fixtures.h:37
ns3::TcpHighSpeed
An implementation of TCP HighSpeed.
Definition
tcp-highspeed.h:39
ns3::TcpHighSpeed::~TcpHighSpeed
~TcpHighSpeed() override
Definition
tcp-highspeed.cc:44
ns3::TcpHighSpeed::TableLookupB
static double TableLookupB(uint32_t w)
Lookup table for the coefficient b (from RFC 3649)
Definition
tcp-highspeed.cc:444
ns3::TcpHighSpeed::TableLookupA
static uint32_t TableLookupA(uint32_t w)
Lookup table for the coefficient a (from RFC 3649)
Definition
tcp-highspeed.cc:145
ns3::TcpHighSpeed::GetSsThresh
uint32_t GetSsThresh(Ptr< const TcpSocketState > tcb, uint32_t bytesInFlight) override
Get slow start threshold following HighSpeed principles.
Definition
tcp-highspeed.cc:130
ns3::TcpHighSpeed::CongestionAvoidance
void CongestionAvoidance(Ptr< TcpSocketState > tcb, uint32_t segmentsAcked) override
Congestion avoidance of TcpHighSpeed.
Definition
tcp-highspeed.cc:88
ns3::TcpHighSpeed::GetName
std::string GetName() const override
Get the name of the congestion control algorithm.
Definition
tcp-highspeed.cc:116
ns3::TcpHighSpeed::GetTypeId
static TypeId GetTypeId()
Get the type ID.
Definition
tcp-highspeed.cc:21
ns3::TcpHighSpeed::TcpHighSpeed
TcpHighSpeed()
Create an unbound tcp socket.
Definition
tcp-highspeed.cc:30
ns3::TcpHighSpeed::Fork
Ptr< TcpCongestionOps > Fork() override
Copy the congestion control algorithm across sockets.
Definition
tcp-highspeed.cc:50
ns3::TcpHighSpeed::m_ackCnt
uint32_t m_ackCnt
Number of received ACK, corrected with the coefficient a.
Definition
tcp-highspeed.h:87
ns3::TcpNewReno
The NewReno implementation.
Definition
tcp-congestion-ops.h:201
ns3::TypeId
a unique identifier for an interface.
Definition
type-id.h:48
uint32_t
ns3
Every class exported by the ns3 library is enclosed in the ns3 namespace.
tcp-congestion-ops.h
src
internet
model
tcp-highspeed.h
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