keep track of the state needed for a single DCF function.Multiple instances of a DcfState can be registered in a single DcfManager to implement 802.11e-style relative QoS. DcfState::SetAifsn and DcfState::SetCwBounds allow the user to control the relative QoS differentiation. More...

#include <dcf-manager.h>

Inheritance diagram for ns3::DcfState:

Collaboration diagram for ns3::DcfState:

Public Member Functions
	DcfState ()
virtual	~DcfState ()
uint32_t	GetAifsn (void) const
uint32_t	GetCw (void) const
uint32_t	GetCwMax (void) const
uint32_t	GetCwMin (void) const
bool	IsAccessRequested (void) const
void	ResetCw (void)
void	SetAifsn (uint32_t aifsn)
void	SetCwMax (uint32_t maxCw)
void	SetCwMin (uint32_t minCw)
void	StartBackoffNow (uint32_t nSlots)
void	UpdateFailedCw (void)

Private Member Functions
virtual void	DoNotifyAccessGranted (void)=0
virtual void	DoNotifyChannelSwitching ()=0
virtual void	DoNotifyCollision (void)=0
virtual void	DoNotifyInternalCollision (void)=0
uint32_t	GetBackoffSlots (void) const
Time	GetBackoffStart (void) const
void	NotifyAccessGranted (void)
void	NotifyAccessRequested (void)
void	NotifyChannelSwitching (void)
void	NotifyCollision (void)
void	NotifyInternalCollision (void)
void	UpdateBackoffSlotsNow (uint32_t nSlots, Time backoffUpdateBound)

Private Attributes
bool	m_accessRequested
uint32_t	m_aifsn
uint32_t	m_backoffSlots
Time	m_backoffStart
uint32_t	m_cw
uint32_t	m_cwMax
uint32_t	m_cwMin

Friends
class	DcfManager

Detailed Description

keep track of the state needed for a single DCF function.

Multiple instances of a DcfState can be registered in a single DcfManager to implement 802.11e-style relative QoS. DcfState::SetAifsn and DcfState::SetCwBounds allow the user to control the relative QoS differentiation.

Definition at line 46 of file dcf-manager.h.

Constructor & Destructor Documentation

ns3::DcfState::DcfState ( )

Definition at line 42 of file dcf-manager.cc.

ns3::DcfState::~DcfState ( )

virtual

Definition at line 52 of file dcf-manager.cc.

Member Function Documentation

virtual void ns3::DcfState::DoNotifyAccessGranted ( void )

privatepure virtual

Called by DcfManager to notify a DcfState subclass that access to the medium is granted and can start immediately.

Referenced by NotifyAccessGranted().

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virtual void ns3::DcfState::DoNotifyChannelSwitching ( )

privatepure virtual

Called by DcfManager to notify a DcfState subclass that a channel switching occured.

The subclass is expected to flush the queue of packets.

Referenced by NotifyChannelSwitching().

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virtual void ns3::DcfState::DoNotifyCollision ( void )

privatepure virtual

Called by DcfManager to notify a DcfState subclass that a normal collision occured, that is, that the medium was busy when access was requested.

The subclass is expected to start a new backoff by calling DcfState::StartBackoffNow and DcfManager::RequestAccess is access is still needed.

Referenced by NotifyCollision().

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virtual void ns3::DcfState::DoNotifyInternalCollision ( void )

privatepure virtual

Called by DcfManager to notify a DcfState subclass that an 'internal' collision occured, that is, that the backoff timer of a higher priority DcfState expired at the same time and that access was granted to this higher priority DcfState.

The subclass is expected to start a new backoff by calling DcfState::StartBackoffNow and DcfManager::RequestAccess is access is still needed.

Referenced by NotifyInternalCollision().

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uint32_t ns3::DcfState::GetAifsn ( void ) const

Definition at line 74 of file dcf-manager.cc.

References m_aifsn.

Referenced by ns3::DcaTxop::GetAifsn(), ns3::EdcaTxopN::GetAifsn(), and ns3::DcfManager::GetBackoffStartFor().

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uint32_t ns3::DcfState::GetBackoffSlots ( void ) const

private

Definition at line 123 of file dcf-manager.cc.

References m_backoffSlots.

Referenced by ns3::DcfManager::DoGrantAccess(), ns3::DcfManager::GetBackoffEndFor(), ns3::DcfManager::NotifySwitchingStartNow(), ns3::DcfManager::RequestAccess(), and ns3::DcfManager::UpdateBackoff().

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Time ns3::DcfState::GetBackoffStart ( void ) const

private

Definition at line 128 of file dcf-manager.cc.

References m_backoffStart.

Referenced by ns3::DcfManager::GetBackoffStartFor().

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uint32_t ns3::DcfState::GetCw ( void ) const

Returns: the current value of the CW variable. The initial value is minCW.

Definition at line 118 of file dcf-manager.cc.

References m_cw.

Referenced by ns3::EdcaTxopN::CompleteTx(), ns3::DcaTxop::DoStart(), ns3::EdcaTxopN::DoStart(), ns3::EdcaTxopN::GotAck(), ns3::DcaTxop::GotAck(), ns3::EdcaTxopN::GotBlockAck(), ns3::EdcaTxopN::MissedAck(), ns3::DcaTxop::MissedAck(), ns3::EdcaTxopN::MissedBlockAck(), ns3::EdcaTxopN::MissedCts(), ns3::DcaTxop::MissedCts(), ns3::EdcaTxopN::NotifyAccessGranted(), ns3::DcaTxop::NotifyAccessGranted(), ns3::EdcaTxopN::NotifyCollision(), and ns3::DcaTxop::NotifyCollision().

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uint32_t ns3::DcfState::GetCwMax ( void ) const

Definition at line 84 of file dcf-manager.cc.

References m_cwMax.

Referenced by ns3::DcaTxop::GetMaxCw(), and ns3::EdcaTxopN::GetMaxCw().

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uint32_t ns3::DcfState::GetCwMin ( void ) const

Definition at line 79 of file dcf-manager.cc.

References m_cwMin.

Referenced by ns3::DcaTxop::GetMinCw(), and ns3::EdcaTxopN::GetMinCw().

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bool ns3::DcfState::IsAccessRequested ( void ) const

Returns: true if access has been requested for this DcfState and has not been granted already, false otherwise.

Definition at line 133 of file dcf-manager.cc.

References m_accessRequested.

Referenced by ns3::DcfManager::DoGrantAccess(), ns3::DcfManager::DoRestartAccessTimeoutIfNeeded(), ns3::DcfManager::RequestAccess(), ns3::EdcaTxopN::RestartAccessIfNeeded(), ns3::DcaTxop::RestartAccessIfNeeded(), ns3::EdcaTxopN::StartAccessIfNeeded(), and ns3::DcaTxop::StartAccessIfNeeded().

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void ns3::DcfState::NotifyAccessGranted ( void )

private

Definition at line 143 of file dcf-manager.cc.

References DoNotifyAccessGranted(), m_accessRequested, and NS_ASSERT.

Referenced by ns3::DcfManager::DoGrantAccess().

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void ns3::DcfState::NotifyAccessRequested ( void )

private

Definition at line 138 of file dcf-manager.cc.

References m_accessRequested.

Referenced by ns3::DcfManager::RequestAccess().

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void ns3::DcfState::NotifyChannelSwitching ( void )

private

Definition at line 160 of file dcf-manager.cc.

References DoNotifyChannelSwitching().

Referenced by ns3::DcfManager::NotifySwitchingStartNow().

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void ns3::DcfState::NotifyCollision ( void )

private

Definition at line 150 of file dcf-manager.cc.

References DoNotifyCollision().

Referenced by ns3::DcfManager::RequestAccess().

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void ns3::DcfState::NotifyInternalCollision ( void )

private

Definition at line 155 of file dcf-manager.cc.

References DoNotifyInternalCollision().

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void ns3::DcfState::ResetCw ( void )

Update the value of the CW variable to take into account a transmission success or a transmission abort (stop transmission of a packet after the maximum number of retransmissions has been reached). By default, this resets the CW variable to minCW.

Definition at line 90 of file dcf-manager.cc.

References m_cw, and m_cwMin.

Referenced by ns3::EdcaTxopN::CompleteTx(), ns3::DcaTxop::DoStart(), ns3::EdcaTxopN::DoStart(), ns3::EdcaTxopN::GotAck(), ns3::DcaTxop::GotAck(), ns3::EdcaTxopN::GotBlockAck(), ns3::EdcaTxopN::MissedAck(), ns3::DcaTxop::MissedAck(), ns3::EdcaTxopN::MissedCts(), ns3::DcaTxop::MissedCts(), ns3::EdcaTxopN::NotifyAccessGranted(), ns3::DcaTxop::NotifyAccessGranted(), ns3::DcfManager::NotifySwitchingStartNow(), SetCwMax(), and SetCwMin().