wifimac::lowerMAC::timing::Backoff Class Reference

IEEE 802.11 DCF style backoff, including post-backoff after transmissions. More...

#include <lowerMAC/timing/Backoff.hpp>

Inheritance diagram for wifimac::lowerMAC::timing::Backoff:

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Collaboration diagram for wifimac::lowerMAC::timing::Backoff:

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List of all members.

Public Member Functions
	Backoff (BackoffObserver *backoffObserver, const wns::pyconfig::View &config)
wns::simulator::Time	finishedAt () const
int	getCurrentCW () const
void	onChannelBusy ()
	Indicates a channel state transition idle->busy.
void	onChannelIdle ()
	Indicates a channel state transition busy->idle.
void	onRxEnd ()
void	onRxError ()
void	onRxStart (wns::simulator::Time expRxTime)
void	registerEOBObserver (BackoffObserver *observer)
	notifying observers every time the backoff has finished, wether or not a transmission is waiting
bool	transmissionRequest (int transmissionCounter)
	Transmission request by the scheduler.
	~Backoff ()
Protected Attributes
int	counter
Private Member Functions
void	channelBusyDelay ()
void	onTimeout ()
	implementation of CanTimeout interface
void	startNewBackoffCountdown (wns::simulator::Time ifsDuration)
void	waitForTimer (const wns::simulator::Time &waitDuration)
Private Attributes
const wns::simulator::Time	aifsDuration
wns::simulator::Time	aifsStart
bool	backoffFinished
BackoffObserver *	backoffObserver
bool	channelIsBusy
int	cw
const int	cwMax
const int	cwMin
bool	duringAIFS
const wns::simulator::Time	eifsDuration
std::vector< BackoffObserver * >	eobObserver
wns::logger::Logger	logger
bool	rxError
const wns::simulator::Time	slotDuration
bool	transmissionWaiting
wns::distribution::Uniform	uniform

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Detailed Description

Essentially, the backoff in IEEE is very simple: Assure that between every channel busy->idle transition and the node's transmission a backoff is counted to zero.

Definition at line 61 of file Backoff.hpp.

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Constructor & Destructor Documentation

Backoff::Backoff	(	BackoffObserver *	backoffObserver,
		const wns::pyconfig::View &	config
	)

Definition at line 36 of file Backoff.cpp.

Backoff::~Backoff

(

)

Definition at line 62 of file Backoff.cpp.

---

Member Function Documentation

void Backoff::channelBusyDelay

(

)

[private]

Definition at line 239 of file Backoff.cpp.

wns::simulator::Time Backoff::finishedAt

(

)

const

time the backoff will be finished at (when called during AIFS the maximum waiting time will be used) wns::simulator::Time() if backoff hasn't started, current time when finished and idle

Definition at line 66 of file Backoff.cpp.

int wifimac::lowerMAC::timing::Backoff::getCurrentCW

(

)

const [inline]

Definition at line 93 of file Backoff.hpp.

void Backoff::onChannelBusy

(

)

[virtual]

Implements wifimac::convergence::IChannelState.

Definition at line 230 of file Backoff.cpp.

void Backoff::onChannelIdle

(

)

[virtual]

Implements wifimac::convergence::IChannelState.

Definition at line 212 of file Backoff.cpp.

void Backoff::onRxEnd

(

)

[virtual]

Implements wifimac::convergence::IRxStartEnd.

Definition at line 257 of file Backoff.cpp.

void Backoff::onRxError

(

)

[virtual]

Implements wifimac::convergence::IRxStartEnd.

Definition at line 263 of file Backoff.cpp.

void Backoff::onRxStart

(

wns::simulator::Time

expRxTime

)

[virtual]

Implements wifimac::convergence::IRxStartEnd.

Definition at line 251 of file Backoff.cpp.

void Backoff::onTimeout

(

)

[private, virtual]

Implements wns::events::CanTimeout.

Definition at line 112 of file Backoff.cpp.

void Backoff::registerEOBObserver

(

BackoffObserver *

observer

)

Definition at line 275 of file Backoff.cpp.

void Backoff::startNewBackoffCountdown

(

wns::simulator::Time

ifsDuration

)

[private]

Definition at line 99 of file Backoff.cpp.

bool Backoff::transmissionRequest

(

int

transmissionCounter

)

Definition at line 179 of file Backoff.cpp.

void wifimac::lowerMAC::timing::Backoff::waitForTimer

(

const wns::simulator::Time &

waitDuration

)

[private]

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Member Data Documentation

const wns::simulator::Time wifimac::lowerMAC::timing::Backoff::aifsDuration [private]

Definition at line 121 of file Backoff.hpp.

wns::simulator::Time wifimac::lowerMAC::timing::Backoff::aifsStart [private]

Definition at line 134 of file Backoff.hpp.

bool wifimac::lowerMAC::timing::Backoff::backoffFinished [private]

Definition at line 124 of file Backoff.hpp.

BackoffObserver* wifimac::lowerMAC::timing::Backoff::backoffObserver [private]

Definition at line 117 of file Backoff.hpp.

bool wifimac::lowerMAC::timing::Backoff::channelIsBusy [private]

Definition at line 135 of file Backoff.hpp.

int wifimac::lowerMAC::timing::Backoff::counter [protected]

Definition at line 140 of file Backoff.hpp.

int wifimac::lowerMAC::timing::Backoff::cw [private]

Definition at line 131 of file Backoff.hpp.

const int wifimac::lowerMAC::timing::Backoff::cwMax [private]

Definition at line 130 of file Backoff.hpp.

const int wifimac::lowerMAC::timing::Backoff::cwMin [private]

Definition at line 129 of file Backoff.hpp.

bool wifimac::lowerMAC::timing::Backoff::duringAIFS [private]

Definition at line 126 of file Backoff.hpp.

const wns::simulator::Time wifimac::lowerMAC::timing::Backoff::eifsDuration [private]

Definition at line 122 of file Backoff.hpp.

std::vector<BackoffObserver*> wifimac::lowerMAC::timing::Backoff::eobObserver [private]

Definition at line 118 of file Backoff.hpp.

wns::logger::Logger wifimac::lowerMAC::timing::Backoff::logger [private]

Definition at line 133 of file Backoff.hpp.

bool wifimac::lowerMAC::timing::Backoff::rxError [private]

Definition at line 127 of file Backoff.hpp.

const wns::simulator::Time wifimac::lowerMAC::timing::Backoff::slotDuration [private]

Definition at line 120 of file Backoff.hpp.

bool wifimac::lowerMAC::timing::Backoff::transmissionWaiting [private]

Definition at line 125 of file Backoff.hpp.

wns::distribution::Uniform wifimac::lowerMAC::timing::Backoff::uniform [private]

Definition at line 132 of file Backoff.hpp.

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

• modules/dll/wimemac/src/lowerMAC/timing/Backoff.hpp
• modules/dll/wimemac/src/lowerMAC/timing/Backoff.cpp
• modules/dll/wimemac/src/lowerMAC/timing/Backoff.cpp