Handle packet fragmentation and retransmissions for data and management frames. More...

#include "txop.h"

Inheritance diagram for ns3::Txop:

Collaboration diagram for ns3::Txop:

Public Types
enum	ChannelAccessStatus { NOT_REQUESTED = 0 , REQUESTED , GRANTED }
	Enumeration for channel access status. More...

typedef Callback< void, WifiMacDropReason, Ptr< const WifiMacQueueItem > >	DroppedMpdu
	typedef for a callback to invoke when an MPDU is dropped. More...

Public Member Functions
	Txop ()

virtual	~Txop ()

int64_t	AssignStreams (int64_t stream)
	Assign a fixed random variable stream number to the random variables used by this model. More...

virtual AcIndex	GetAccessCategory (void) const
	Get the access category. More...

virtual ChannelAccessStatus	GetAccessStatus (void) const

uint8_t	GetAifsn (void) const
	Return the number of slots that make up an AIFS. More...

uint32_t	GetMaxCw (void) const
	Return the maximum contention window size. More...

uint32_t	GetMinCw (void) const
	Return the minimum contention window size. More...

Time	GetTxopLimit (void) const
	Return the TXOP limit. More...

Ptr< WifiMacQueue >	GetWifiMacQueue () const
	Return the packet queue associated with this Txop. More...

virtual bool	IsQosTxop () const
	Check for QoS TXOP. More...

virtual void	NotifyChannelAccessed (Time txopDuration=Seconds(0))
	Called by the FrameExchangeManager to notify that channel access has been granted for the given amount of time. More...

virtual void	NotifyChannelReleased (void)
	Called by the FrameExchangeManager to notify the completion of the transmissions. More...

virtual void	NotifyChannelSwitching (void)
	When a channel switching occurs, enqueued packets are removed. More...

virtual void	NotifyOff (void)
	When off operation occurs, the queue gets cleaned up. More...

virtual void	NotifyOn (void)
	When on operation occurs, channel access will be started. More...

virtual void	NotifySleep (void)
	When sleep operation occurs, if there is a pending packet transmission, it will be reinserted to the front of the queue. More...

virtual void	NotifyWakeUp (void)
	When wake up operation occurs, channel access will be restarted. More...

virtual void	Queue (Ptr< Packet > packet, const WifiMacHeader &hdr)

void	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). More...

void	SetAifsn (uint8_t aifsn)
	Set the number of slots that make up an AIFS. More...

void	SetChannelAccessManager (const Ptr< ChannelAccessManager > manager)
	Set ChannelAccessManager this Txop is associated to. More...

virtual void	SetDroppedMpduCallback (DroppedMpdu callback)

void	SetMaxCw (uint32_t maxCw)
	Set the maximum contention window size. More...

void	SetMinCw (uint32_t minCw)
	Set the minimum contention window size. More...

void	SetTxMiddle (const Ptr< MacTxMiddle > txMiddle)
	Set MacTxMiddle this Txop is associated to. More...

void	SetTxopLimit (Time txopLimit)
	Set the TXOP limit. More...

virtual void	SetWifiRemoteStationManager (const Ptr< WifiRemoteStationManager > remoteManager)
	Set WifiRemoteStationsManager this Txop is associated to. More...

void	StartBackoffNow (uint32_t nSlots)

void	UpdateFailedCw (void)
	Update the value of the CW variable to take into account a transmission failure. 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<>
Ptr< Object >	GetObject () const
	Specialization of () for objects of type ns3::Object. More...

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

template<>
Ptr< Object >	GetObject (TypeId tid) const
	Specialization of (TypeId tid) for objects of type ns3::Object. More...

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

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

virtual void	GenerateBackoff (void)
	Generate a new backoff now. More...

uint32_t	GetBackoffSlots (void) const
	Return the current number of backoff slots. More...

Time	GetBackoffStart (void) const
	Return the time when the backoff procedure started. More...

uint32_t	GetCw (void) const

virtual bool	HasFramesToTransmit (void)
	Check if the Txop has frames to transmit. More...

virtual void	NotifyAccessRequested (void)
	Notify that access request has been received. More...

virtual void	NotifyInternalCollision (void)
	Notify the Txop that internal collision has occurred. More...

void	RequestAccess (void)
	Request access to the ChannelAccessManager. More...

virtual void	StartAccessIfNeeded (void)
	Request access from Txop if needed. More...

void	UpdateBackoffSlotsNow (uint32_t nSlots, Time backoffUpdateBound)
	Update backoff slots that nSlots has passed. More...

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

Protected Attributes
ChannelAccessStatus	m_access
	channel access status More...

uint8_t	m_aifsn
	the AIFSN More...

uint32_t	m_backoff
	the current backoff More...

uint32_t	m_backoffSlots
	the number of backoff slots More...

Time	m_backoffStart
	the backoffStart variable is used to keep track of the time at which a backoff was started or the time at which the backoff counter was last updated. More...

TracedCallback< uint32_t >	m_backoffTrace
	backoff trace value More...

Ptr< ChannelAccessManager >	m_channelAccessManager
	the channel access manager More...

uint32_t	m_cw
	the current contention window More...

uint32_t	m_cwMax
	the maximum contention window More...

uint32_t	m_cwMin
	the minimum contention window More...

TracedValue< uint32_t >	m_cwTrace
	CW trace value. More...

DroppedMpdu	m_droppedMpduCallback
	the dropped MPDU callback More...

Ptr< WifiMacQueue >	m_queue
	the wifi MAC queue More...

Ptr< UniformRandomVariable >	m_rng
	the random stream More...

Ptr< WifiRemoteStationManager >	m_stationManager
	the wifi remote station manager More...

Ptr< MacTxMiddle >	m_txMiddle
	the MacTxMiddle More...

Time	m_txopLimit
	the TXOP limit time More...

Friends
class	ChannelAccessManager
	< ChannelAccessManager associated class More...

class	MacLowTransmissionListener
	allow MacLowTransmissionListener class access 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

Handle packet fragmentation and retransmissions for data and management frames.

This class implements the packet fragmentation and retransmission policy for data and management frames. It uses the ns3::MacLow and ns3::ChannelAccessManager helper classes to respectively send packets and decide when to send them. Packets are stored in a ns3::WifiMacQueue until they can be sent.

The policy currently implemented uses a simple fragmentation threshold: any packet bigger than this threshold is fragmented in fragments whose size is smaller than the threshold.

The retransmission policy is also very simple: every packet is retransmitted until it is either successfully transmitted or it has been retransmitted up until the SSRC or SLRC thresholds.

The RTS/CTS policy is similar to the fragmentation policy: when a packet is bigger than a threshold, the RTS/CTS protocol is used.

Config Paths

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

"/NodeList/[i]/DeviceList/[i]/$ns3::WifiNetDevice/Mac/$ns3::RegularWifiMac/Txop"

Attributes

MinCw: The minimum value of the contention window.
- Set with class: ns3::UintegerValue
- Underlying type: uint32_t 0:4294967295
- Initial value: 15
- Flags: construct write read
MaxCw: The maximum value of the contention window.
- Set with class: ns3::UintegerValue
- Underlying type: uint32_t 0:4294967295
- Initial value: 1023
- Flags: construct write read
Aifsn: The AIFSN: the default value conforms to non-QOS.
- Set with class: ns3::UintegerValue
- Underlying type: uint8_t 0:255
- Initial value: 2
- Flags: construct write read
TxopLimit: The TXOP limit: the default value conforms to non-QoS.
- Set with class: ns3::TimeValue
- Underlying type: Time -9.22337e+18ns:+9.22337e+18ns
- Initial value: +0ns
- Flags: construct write read
Queue: The WifiMacQueue object
- Set with class: ns3::PointerValue
- Underlying type: ns3::Ptr< ns3::WifiMacQueue>
- Flags: read

TraceSources

BackoffTrace: Trace source for backoff values
Callback signature: ns3::TracedCallback::Uint32Callback
CwTrace: Trace source for contention window values
Callback signature: ns3::TracedValueCallback::Uint32

Size of this type is 184 bytes (on a 64-bit architecture).

Definition at line 65 of file txop.h.

Member Typedef Documentation

◆ DroppedMpdu

typedef Callback<void, WifiMacDropReason, Ptr<const WifiMacQueueItem> > ns3::Txop::DroppedMpdu

typedef for a callback to invoke when an MPDU is dropped.

Definition at line 83 of file txop.h.

Member Enumeration Documentation

◆ ChannelAccessStatus

enum ns3::Txop::ChannelAccessStatus

Enumeration for channel access status.

Enumerator
NOT_REQUESTED
REQUESTED
GRANTED

Definition at line 88 of file txop.h.

Constructor & Destructor Documentation

◆ Txop()

ns3::Txop::Txop ( )

Definition at line 86 of file txop.cc.

References m_queue, m_rng, and NS_LOG_FUNCTION.

◆ ~Txop()

ns3::Txop::~Txop ( )

virtual

Definition at line 101 of file txop.cc.

References NS_LOG_FUNCTION.

Member Function Documentation

◆ AssignStreams()

int64_t ns3::Txop::AssignStreams ( int64_t stream )

Assign a fixed random variable stream number to the random variables used by this model.

Return the number of streams (possibly zero) that have been assigned.

Parameters

stream first stream index to use.

Returns: the number of stream indices assigned by this model.

Definition at line 303 of file txop.cc.

References m_rng, NS_LOG_FUNCTION, and ns3::RandomVariableStream::SetStream().

Referenced by ns3::MeshHelper::AssignStreams(), ns3::WaveHelper::AssignStreams(), ns3::WifiHelper::AssignStreams(), and AssignWifiRandomStreams().

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◆ DoDispose()

void ns3::Txop::DoDispose ( void )

overrideprotectedvirtual

Destructor implementation.

This method is called by Dispose() or by the Object's destructor, whichever comes first.

Subclasses are expected to implement their real destruction code in an overridden version of this method and chain up to their parent's implementation once they are done. i.e, for simplicity, the destructor of every subclass should be empty and its content should be moved to the associated DoDispose() method.

It is safe to call GetObject() from within this method.

Reimplemented from ns3::Object.

Definition at line 107 of file txop.cc.

References m_channelAccessManager, m_queue, m_rng, m_stationManager, m_txMiddle, and NS_LOG_FUNCTION.

Referenced by ns3::QosTxop::DoDispose().

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◆ DoInitialize()

void ns3::Txop::DoInitialize ( void )

overrideprotectedvirtual

Initialize() implementation.

This method is called only once by Initialize(). If the user calls Initialize() multiple times, DoInitialize() is called only the first time.

Subclasses are expected to override this method and chain up to their parent's implementation once they are done. It is safe to call GetObject() and AggregateObject() from within this method.

Reimplemented from ns3::Object.

Definition at line 321 of file txop.cc.

References GenerateBackoff(), NS_LOG_FUNCTION, and ResetCw().

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◆ GenerateBackoff()

void ns3::Txop::GenerateBackoff ( void )

protectedvirtual

Generate a new backoff now.

Definition at line 370 of file txop.cc.

References GetCw(), ns3::UniformRandomVariable::GetInteger(), m_backoff, m_backoffTrace, m_rng, NS_LOG_FUNCTION, and StartBackoffNow().

Referenced by ns3::QosTxop::AddBaResponseTimeout(), ns3::QosTxop::DoInitialize(), DoInitialize(), NotifyChannelReleased(), NotifyInternalCollision(), ns3::QosTxop::NotifyInternalCollision(), and Queue().

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◆ GetAccessCategory()

AcIndex ns3::Txop::GetAccessCategory ( void ) const

virtual

Get the access category.

Returns: the access category.

Reimplemented in ns3::QosTxop.

Definition at line 427 of file txop.cc.

References ns3::AC_BE_NQOS.

◆ GetAccessStatus()

Txop::ChannelAccessStatus ns3::Txop::GetAccessStatus ( void ) const

virtual

Returns: the current channel access status.

Definition at line 329 of file txop.cc.

References m_access.

Referenced by ns3::ChannelAccessManager::DoGrantDcfAccess(), ns3::ChannelAccessManager::NeedBackoffUponAccess(), and ns3::ChannelAccessManager::RequestAccess().

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◆ GetAifsn()

uint8_t ns3::Txop::GetAifsn ( void ) const

Return the number of slots that make up an AIFS.

Returns: the number of slots that make up an AIFS.

Definition at line 268 of file txop.cc.

References m_aifsn.

Referenced by OfdmaAckSequenceTest::DoRun(), ns3::ChannelAccessManager::GetBackoffStartFor(), ns3::ApWifiMac::GetEdcaParameterSet(), GetTypeId(), ns3::ChannelAccessManager::NeedBackoffUponAccess(), and ns3::ChannelAccessManager::RequestAccess().

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◆ GetBackoffSlots()

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

protected

Return the current number of backoff slots.

Returns: the current number of backoff slots

Definition at line 204 of file txop.cc.

References m_backoffSlots.

Referenced by ns3::ChannelAccessManager::DoGrantDcfAccess(), ns3::ChannelAccessManager::GetBackoffEndFor(), and ns3::ChannelAccessManager::NeedBackoffUponAccess().

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◆ GetBackoffStart()

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

protected

Return the time when the backoff procedure started.

Returns: the time when the backoff procedure started

Definition at line 210 of file txop.cc.

References m_backoffStart.

Referenced by ns3::ChannelAccessManager::GetBackoffStartFor(), and ns3::ChannelAccessManager::RequestAccess().

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◆ GetCw()

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

protected

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

Definition at line 181 of file txop.cc.

References m_cw.

Referenced by GenerateBackoff().

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◆ GetMaxCw()

uint32_t ns3::Txop::GetMaxCw ( void ) const

Return the maximum contention window size.

Returns: the maximum contention window size.

Definition at line 262 of file txop.cc.

References m_cwMax.

Referenced by ns3::ApWifiMac::GetEdcaParameterSet(), and GetTypeId().

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◆ GetMinCw()

uint32_t ns3::Txop::GetMinCw ( void ) const

Return the minimum contention window size.

Returns: the minimum contention window size.

Definition at line 256 of file txop.cc.

References m_cwMin.

Referenced by ns3::ApWifiMac::GetEdcaParameterSet(), and GetTypeId().

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◆ GetTxopLimit()

Time ns3::Txop::GetTxopLimit ( void ) const

Return the TXOP limit.

Returns: the TXOP limit.

Definition at line 274 of file txop.cc.

References m_txopLimit.

Referenced by TwoLevelAggregationTest::DoRun(), ns3::QosFrameExchangeManager::GetCtsToSelfDurationId(), ns3::ApWifiMac::GetEdcaParameterSet(), ns3::QosFrameExchangeManager::GetFrameDurationId(), ns3::HtFrameExchangeManager::GetPsduDurationId(), ns3::QosFrameExchangeManager::GetRtsDurationId(), GetTypeId(), ns3::WifiDefaultAckManager::IsResponseNeeded(), ns3::QosFrameExchangeManager::SendCfEndIfNeeded(), ns3::QosFrameExchangeManager::StartTransmission(), ns3::QosFrameExchangeManager::TransmissionFailed(), ns3::HtFrameExchangeManager::TransmissionSucceeded(), and ns3::QosFrameExchangeManager::TransmissionSucceeded().

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◆ GetTypeId()

TypeId ns3::Txop::GetTypeId ( void )

static

Get the type ID.

Returns: the object TypeId

Definition at line 44 of file txop.cc.

References GetAifsn(), GetMaxCw(), GetMinCw(), GetTxopLimit(), GetWifiMacQueue(), m_backoffTrace, m_cwTrace, ns3::MakePointerAccessor(), ns3::MakeTimeAccessor(), ns3::MakeTimeChecker(), ns3::MakeTraceSourceAccessor(), ns3::MakeUintegerAccessor(), ns3::MilliSeconds(), SetAifsn(), SetMaxCw(), SetMinCw(), ns3::TypeId::SetParent(), and SetTxopLimit().

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◆ GetWifiMacQueue()

Ptr< WifiMacQueue > ns3::Txop::GetWifiMacQueue ( ) const

Return the packet queue associated with this Txop.

Returns: the associated WifiMacQueue

Definition at line 150 of file txop.cc.

References m_queue, and NS_LOG_FUNCTION.

Referenced by AmpduAggregationTest::DoRun(), TwoLevelAggregationTest::DoRun(), HeAggregationTest::DoRunSubTest(), GetTypeId(), ns3::WifiHelper::Install(), ns3::WifiDefaultAckManager::IsResponseNeeded(), ns3::HtFrameExchangeManager::NeedSetupBlockAck(), ns3::FrameExchangeManager::ReceivedNormalAck(), ns3::FrameExchangeManager::RetransmitMpduAfterMissedAck(), ns3::WaveFrameExchangeManager::StartTransmission(), and ns3::FrameExchangeManager::StartTransmission().

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◆ HasFramesToTransmit()

bool ns3::Txop::HasFramesToTransmit ( void )

protectedvirtual

Check if the Txop has frames to transmit.

Returns: true if the Txop has frames to transmit.

Reimplemented in ns3::QosTxop.

Definition at line 280 of file txop.cc.

References m_queue, and NS_LOG_FUNCTION.

Referenced by ns3::ChannelAccessManager::NeedBackoffUponAccess(), NotifyChannelReleased(), and StartAccessIfNeeded().

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◆ IsQosTxop()

bool ns3::Txop::IsQosTxop ( void ) const

virtual

Check for QoS TXOP.

Returns: true if QoS TXOP.

Reimplemented in ns3::QosTxop.

Definition at line 421 of file txop.cc.

Referenced by ns3::ChannelAccessManager::NeedBackoffUponAccess(), ns3::ChannelAccessManager::RequestAccess(), and ns3::QosFrameExchangeManager::StartTransmission().

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◆ NotifyAccessRequested()

void ns3::Txop::NotifyAccessRequested ( void )

protectedvirtual

Notify that access request has been received.

Definition at line 335 of file txop.cc.

References m_access, NS_LOG_FUNCTION, and REQUESTED.

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

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◆ NotifyChannelAccessed()

void ns3::Txop::NotifyChannelAccessed ( Time txopDuration = Seconds (0) )

virtual

Called by the FrameExchangeManager to notify that channel access has been granted for the given amount of time.

Parameters

txopDuration the duration of the TXOP gained (zero for DCF)

Reimplemented in ns3::QosTxop.

Definition at line 342 of file txop.cc.

References GRANTED, m_access, and NS_LOG_FUNCTION.

Referenced by ns3::QosTxop::NotifyChannelAccessed(), ns3::WaveFrameExchangeManager::StartTransmission(), ns3::FrameExchangeManager::StartTransmission(), and FrameExchangeManagerStub::StartTransmission().

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◆ NotifyChannelReleased()

void ns3::Txop::NotifyChannelReleased ( void )

virtual

Called by the FrameExchangeManager to notify the completion of the transmissions.

This method generates a new backoff and restarts access if needed.

Reimplemented in ns3::QosTxop.

Definition at line 349 of file txop.cc.

References GenerateBackoff(), HasFramesToTransmit(), m_access, NOT_REQUESTED, NS_LOG_FUNCTION, RequestAccess(), and ns3::Simulator::ScheduleNow().

Referenced by ns3::QosTxop::NotifyChannelReleased(), ns3::QosFrameExchangeManager::SendCfEndIfNeeded(), ns3::WaveFrameExchangeManager::StartTransmission(), ns3::FrameExchangeManager::StartTransmission(), ns3::FrameExchangeManager::TransmissionFailed(), and ns3::FrameExchangeManager::TransmissionSucceeded().

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◆ NotifyChannelSwitching()

void ns3::Txop::NotifyChannelSwitching ( void )

virtual

When a channel switching occurs, enqueued packets are removed.

Definition at line 387 of file txop.cc.

References m_queue, and NS_LOG_FUNCTION.

Referenced by ns3::OcbWifiMac::CancleTx().

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◆ NotifyInternalCollision()

void ns3::Txop::NotifyInternalCollision ( void )

protectedvirtual

Notify the Txop that internal collision has occurred.

Reimplemented in ns3::QosTxop.

Definition at line 379 of file txop.cc.

References GenerateBackoff(), NS_LOG_FUNCTION, and StartAccessIfNeeded().

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◆ NotifyOff()

void ns3::Txop::NotifyOff ( void )

virtual

When off operation occurs, the queue gets cleaned up.

Definition at line 400 of file txop.cc.

References m_queue, and NS_LOG_FUNCTION.

◆ NotifyOn()

void ns3::Txop::NotifyOn ( void )

virtual

When on operation occurs, channel access will be started.

Definition at line 414 of file txop.cc.

References NS_LOG_FUNCTION, and StartAccessIfNeeded().

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◆ NotifySleep()

void ns3::Txop::NotifySleep ( void )

virtual

When sleep operation occurs, if there is a pending packet transmission, it will be reinserted to the front of the queue.

Definition at line 394 of file txop.cc.

References NS_LOG_FUNCTION.

◆ NotifyWakeUp()

void ns3::Txop::NotifyWakeUp ( void )

virtual

When wake up operation occurs, channel access will be restarted.

Definition at line 407 of file txop.cc.

References NS_LOG_FUNCTION, and StartAccessIfNeeded().

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◆ Queue()

void ns3::Txop::Queue	(	Ptr< Packet >	packet,
		const WifiMacHeader &	hdr
	)

virtual

Parameters

packet	packet to send.
hdr	header of packet to send.

Store the packet in the internal queue until it can be sent safely.

Definition at line 288 of file txop.cc.

References GenerateBackoff(), m_channelAccessManager, m_queue, NS_LOG_FUNCTION, ns3::Packet::RemovePacketTag(), and StartAccessIfNeeded().

Referenced by ns3::OcbWifiMac::Enqueue(), ns3::AdhocWifiMac::Enqueue(), ns3::StaWifiMac::Enqueue(), ns3::ApWifiMac::ForwardDown(), ns3::StaWifiMac::SendAssociationRequest(), ns3::ApWifiMac::SendAssocResp(), ns3::MeshWifiInterfaceMac::SendBeacon(), ns3::ApWifiMac::SendOneBeacon(), ns3::StaWifiMac::SendProbeRequest(), ns3::ApWifiMac::SendProbeResp(), and ns3::OcbWifiMac::SendVsc().

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◆ RequestAccess()

void ns3::Txop::RequestAccess ( void )

protected

Request access to the ChannelAccessManager.

Definition at line 361 of file txop.cc.

References m_access, m_channelAccessManager, and NOT_REQUESTED.

Referenced by NotifyChannelReleased().

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◆ ResetCw()

void ns3::Txop::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 187 of file txop.cc.

References m_cw, m_cwMin, m_cwTrace, and NS_LOG_FUNCTION.

Referenced by ns3::HtFrameExchangeManager::BlockAckTimeout(), ns3::FrameExchangeManager::CtsTimeout(), ns3::HtFrameExchangeManager::CtsTimeout(), ns3::QosTxop::DoInitialize(), DoInitialize(), ns3::FrameExchangeManager::NormalAckTimeout(), ns3::QosTxop::NotifyInternalCollision(), ns3::FrameExchangeManager::ReceivedNormalAck(), ns3::HtFrameExchangeManager::ReceiveMpdu(), SetMaxCw(), and SetMinCw().

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◆ SetAifsn()

void ns3::Txop::SetAifsn ( uint8_t aifsn )

Set the number of slots that make up an AIFS.

Parameters

aifsn the number of slots that make up an AIFS.

Definition at line 241 of file txop.cc.

References m_aifsn, and NS_LOG_FUNCTION.

Referenced by ns3::ApWifiMac::ApWifiMac(), ns3::WifiMac::ConfigureDcf(), ns3::OcbWifiMac::ConfigureEdca(), ns3::MeshWifiInterfaceMac::ConfigureStandard(), GetTypeId(), and ns3::StaWifiMac::SetEdcaParameters().

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◆ SetChannelAccessManager()

void ns3::Txop::SetChannelAccessManager ( const Ptr< ChannelAccessManager > manager )

Set ChannelAccessManager this Txop is associated to.

Parameters

manager ChannelAccessManager to associate.

Definition at line 118 of file txop.cc.

References m_channelAccessManager, and NS_LOG_FUNCTION.

Referenced by ns3::ApWifiMac::ApWifiMac(), ns3::RegularWifiMac::RegularWifiMac(), and ns3::RegularWifiMac::SetupEdcaQueue().

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◆ SetDroppedMpduCallback()

void ns3::Txop::SetDroppedMpduCallback ( DroppedMpdu callback )

virtual

Parameters

callback the callback to invoke when an MPDU is dropped

Reimplemented in ns3::QosTxop.

Definition at line 139 of file txop.cc.

References ns3::Callback< R, T1, T2, T3, T4, T5, T6, T7, T8, T9 >::Bind(), m_droppedMpduCallback, m_queue, NS_LOG_FUNCTION, ns3::WIFI_MAC_DROP_EXPIRED_LIFETIME, and ns3::WIFI_MAC_DROP_FAILED_ENQUEUE.

Referenced by ns3::RegularWifiMac::RegularWifiMac(), and ns3::QosTxop::SetDroppedMpduCallback().

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◆ SetMaxCw()

void ns3::Txop::SetMaxCw ( uint32_t maxCw )

Set the maximum contention window size.

Parameters

maxCw the maximum contention window size.

Definition at line 169 of file txop.cc.

References m_cwMax, NS_LOG_FUNCTION, and ResetCw().

Referenced by ns3::ApWifiMac::ApWifiMac(), ns3::WifiMac::ConfigureDcf(), ns3::OcbWifiMac::ConfigureEdca(), ns3::MeshWifiInterfaceMac::ConfigureStandard(), GetTypeId(), and ns3::StaWifiMac::SetEdcaParameters().

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◆ SetMinCw()

void ns3::Txop::SetMinCw ( uint32_t minCw )

Set the minimum contention window size.

Parameters

minCw the minimum contention window size.

Definition at line 157 of file txop.cc.

References m_cwMin, NS_LOG_FUNCTION, and ResetCw().

Referenced by ns3::ApWifiMac::ApWifiMac(), ns3::WifiMac::ConfigureDcf(), ns3::OcbWifiMac::ConfigureEdca(), ns3::MeshWifiInterfaceMac::ConfigureStandard(), GetTypeId(), and ns3::StaWifiMac::SetEdcaParameters().

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◆ SetTxMiddle()

void ns3::Txop::SetTxMiddle ( const Ptr< MacTxMiddle > txMiddle )

Set MacTxMiddle this Txop is associated to.

Parameters

txMiddle MacTxMiddle to associate.

Definition at line 125 of file txop.cc.

References m_txMiddle, and NS_LOG_FUNCTION.

Referenced by ns3::ApWifiMac::ApWifiMac(), ns3::RegularWifiMac::RegularWifiMac(), and ns3::RegularWifiMac::SetupEdcaQueue().

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◆ SetTxopLimit()

void ns3::Txop::SetTxopLimit ( Time txopLimit )

Set the TXOP limit.

Parameters

txopLimit the TXOP limit. Value zero corresponds to default Txop.

Definition at line 248 of file txop.cc.

References ns3::Time::GetMicroSeconds(), m_txopLimit, NS_ASSERT_MSG, and NS_LOG_FUNCTION.

Referenced by ns3::WifiMac::ConfigureDcf(), OfdmaAckSequenceTest::DoRun(), GetTypeId(), Experiment::Run(), and ns3::StaWifiMac::SetEdcaParameters().

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◆ SetWifiRemoteStationManager()

void ns3::Txop::SetWifiRemoteStationManager ( const Ptr< WifiRemoteStationManager > remoteManager )

virtual

Set WifiRemoteStationsManager this Txop is associated to.

Parameters

remoteManager WifiRemoteStationManager to associate.

Reimplemented in ns3::QosTxop.

Definition at line 132 of file txop.cc.

References m_stationManager, and NS_LOG_FUNCTION.

Referenced by ns3::QosTxop::SetWifiRemoteStationManager(), ns3::ApWifiMac::SetWifiRemoteStationManager(), and ns3::RegularWifiMac::SetWifiRemoteStationManager().

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◆ StartAccessIfNeeded()

void ns3::Txop::StartAccessIfNeeded ( void )

protectedvirtual

Request access from Txop if needed.

Definition at line 311 of file txop.cc.

References HasFramesToTransmit(), m_access, m_channelAccessManager, NOT_REQUESTED, and NS_LOG_FUNCTION.

Referenced by NotifyInternalCollision(), NotifyOn(), NotifyWakeUp(), and Queue().

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◆ StartBackoffNow()

void ns3::Txop::StartBackoffNow ( uint32_t nSlots )

Parameters

nSlots the number of slots of the backoff.

Start a backoff by initializing the backoff counter to the number of slots specified.

Definition at line 225 of file txop.cc.

References m_backoffSlots, m_backoffStart, ns3::Simulator::Now(), NS_LOG_DEBUG, and NS_LOG_FUNCTION.

Referenced by GenerateBackoff().

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◆ UpdateBackoffSlotsNow()

void ns3::Txop::UpdateBackoffSlotsNow	(	uint32_t	nSlots,
		Time	backoffUpdateBound
	)

protected

Update backoff slots that nSlots has passed.

Parameters

nSlots	the number of slots to decrement
backoffUpdateBound	the time at which backoff should start

Definition at line 216 of file txop.cc.

References m_backoffSlots, m_backoffStart, NS_LOG_DEBUG, and NS_LOG_FUNCTION.

Referenced by ns3::ChannelAccessManager::NeedBackoffUponAccess(), and ns3::ChannelAccessManager::RequestAccess().

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◆ UpdateFailedCw()

void ns3::Txop::UpdateFailedCw ( void )

Update the value of the CW variable to take into account a transmission failure.

By default, this triggers a doubling of CW (capped by maxCW).

Definition at line 195 of file txop.cc.

References m_cw, m_cwMax, m_cwTrace, min, and NS_LOG_FUNCTION.

Referenced by ns3::HtFrameExchangeManager::BlockAckTimeout(), ns3::FrameExchangeManager::CtsTimeout(), ns3::HtFrameExchangeManager::CtsTimeout(), ns3::FrameExchangeManager::NormalAckTimeout(), and ns3::QosTxop::NotifyInternalCollision().

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Friends And Related Function Documentation

◆ ChannelAccessManager

friend class ChannelAccessManager

friend

< ChannelAccessManager associated class

Definition at line 273 of file txop.h.

◆ MacLowTransmissionListener

friend class MacLowTransmissionListener

friend

allow MacLowTransmissionListener class access

Definition at line 69 of file txop.h.

Member Data Documentation

◆ m_access

ChannelAccessStatus ns3::Txop::m_access

protected

channel access status

Definition at line 342 of file txop.h.

Referenced by ns3::QosTxop::AddBaResponseTimeout(), GetAccessStatus(), ns3::QosTxop::GotAddBaResponse(), NotifyAccessRequested(), NotifyChannelAccessed(), NotifyChannelReleased(), ns3::QosTxop::NotifyInternalCollision(), ns3::QosTxop::PushFront(), RequestAccess(), and StartAccessIfNeeded().

◆ m_aifsn

uint8_t ns3::Txop::m_aifsn

protected

the AIFSN

Definition at line 351 of file txop.h.

Referenced by GetAifsn(), and SetAifsn().

◆ m_backoff

uint32_t ns3::Txop::m_backoff

protected

the current backoff

Definition at line 341 of file txop.h.

Referenced by GenerateBackoff().

◆ m_backoffSlots

uint32_t ns3::Txop::m_backoffSlots

protected

the number of backoff slots

Definition at line 343 of file txop.h.

Referenced by GetBackoffSlots(), StartBackoffNow(), and UpdateBackoffSlotsNow().

◆ m_backoffStart

Time ns3::Txop::m_backoffStart

protected

the backoffStart variable is used to keep track of the time at which a backoff was started or the time at which the backoff counter was last updated.

Definition at line 349 of file txop.h.

Referenced by GetBackoffStart(), StartBackoffNow(), and UpdateBackoffSlotsNow().

◆ m_backoffTrace

TracedCallback<uint32_t> ns3::Txop::m_backoffTrace

protected

backoff trace value

Definition at line 354 of file txop.h.

Referenced by GenerateBackoff(), and GetTypeId().

◆ m_channelAccessManager

Ptr<ChannelAccessManager> ns3::Txop::m_channelAccessManager

protected

the channel access manager

Definition at line 331 of file txop.h.

Referenced by ns3::QosTxop::AddBaResponseTimeout(), DoDispose(), ns3::QosTxop::GotAddBaResponse(), ns3::QosTxop::NotifyInternalCollision(), ns3::QosTxop::PushFront(), Queue(), RequestAccess(), SetChannelAccessManager(), and StartAccessIfNeeded().

◆ m_cw

uint32_t ns3::Txop::m_cw

protected

the current contention window

Definition at line 340 of file txop.h.

Referenced by GetCw(), ResetCw(), and UpdateFailedCw().

◆ m_cwMax

uint32_t ns3::Txop::m_cwMax

protected

the maximum contention window

Definition at line 339 of file txop.h.

Referenced by GetMaxCw(), SetMaxCw(), and UpdateFailedCw().

◆ m_cwMin

uint32_t ns3::Txop::m_cwMin

protected

the minimum contention window

Definition at line 338 of file txop.h.

Referenced by GetMinCw(), ResetCw(), and SetMinCw().

◆ m_cwTrace

TracedValue<uint32_t> ns3::Txop::m_cwTrace

protected

CW trace value.

Definition at line 355 of file txop.h.

Referenced by GetTypeId(), ResetCw(), and UpdateFailedCw().

◆ m_droppedMpduCallback

DroppedMpdu ns3::Txop::m_droppedMpduCallback

protected

the dropped MPDU callback

Definition at line 332 of file txop.h.

Referenced by ns3::QosTxop::NotifyInternalCollision(), SetDroppedMpduCallback(), and ns3::QosTxop::SetDroppedMpduCallback().

◆ m_queue

Ptr<WifiMacQueue> ns3::Txop::m_queue

protected

the wifi MAC queue

Definition at line 333 of file txop.h.

Referenced by ns3::QosTxop::QosTxop(), Txop(), DoDispose(), ns3::QosTxop::GetNextMpdu(), GetWifiMacQueue(), ns3::QosTxop::GotAddBaResponse(), HasFramesToTransmit(), ns3::QosTxop::HasFramesToTransmit(), NotifyChannelSwitching(), ns3::QosTxop::NotifyInternalCollision(), NotifyOff(), ns3::QosTxop::PeekNextMpdu(), ns3::QosTxop::PushFront(), Queue(), SetDroppedMpduCallback(), and ns3::QosTxop::SetQosQueueSize().

◆ m_rng

Ptr<UniformRandomVariable> ns3::Txop::m_rng

protected

the random stream

Definition at line 336 of file txop.h.

Referenced by Txop(), AssignStreams(), DoDispose(), and GenerateBackoff().

◆ m_stationManager

Ptr<WifiRemoteStationManager> ns3::Txop::m_stationManager

protected

the wifi remote station manager

Definition at line 335 of file txop.h.

Referenced by DoDispose(), ns3::QosTxop::GetNextMpdu(), ns3::QosTxop::NotifyInternalCollision(), ns3::QosTxop::PrepareBlockAckRequest(), SetWifiRemoteStationManager(), and ns3::QosTxop::SetWifiRemoteStationManager().

◆ m_txMiddle

Ptr<MacTxMiddle> ns3::Txop::m_txMiddle

protected

the MacTxMiddle

Definition at line 334 of file txop.h.

Referenced by ns3::QosTxop::AssignSequenceNumber(), DoDispose(), ns3::QosTxop::GetNextSequenceNumberFor(), ns3::QosTxop::GotAddBaResponse(), ns3::QosTxop::PeekNextMpdu(), ns3::QosTxop::PeekNextSequenceNumberFor(), and SetTxMiddle().

◆ m_txopLimit

Time ns3::Txop::m_txopLimit

protected

the TXOP limit time

Definition at line 352 of file txop.h.

Referenced by GetTxopLimit(), and SetTxopLimit().

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

src/wifi/model/txop.h
src/wifi/model/txop.cc

Public Types

Public Member Functions

Static Public Member Functions

Protected Member Functions

Protected Attributes

Friends

Additional Inherited Members

Detailed Description

Config Paths

Attributes

TraceSources

Member Typedef Documentation

◆ DroppedMpdu

Member Enumeration Documentation

◆ ChannelAccessStatus

Constructor & Destructor Documentation

◆ Txop()

◆ ~Txop()

Member Function Documentation

◆ AssignStreams()

◆ DoDispose()

◆ DoInitialize()

◆ GenerateBackoff()

◆ GetAccessCategory()

◆ GetAccessStatus()

◆ GetAifsn()

◆ GetBackoffSlots()

◆ GetBackoffStart()

◆ GetCw()

◆ GetMaxCw()

◆ GetMinCw()

◆ GetTxopLimit()

◆ GetTypeId()

◆ GetWifiMacQueue()

◆ HasFramesToTransmit()

◆ IsQosTxop()

◆ NotifyAccessRequested()

◆ NotifyChannelAccessed()

◆ NotifyChannelReleased()

◆ NotifyChannelSwitching()

◆ NotifyInternalCollision()

◆ NotifyOff()

◆ NotifyOn()

◆ NotifySleep()

◆ NotifyWakeUp()

◆ Queue()

◆ RequestAccess()

◆ ResetCw()

◆ SetAifsn()

◆ SetChannelAccessManager()

◆ SetDroppedMpduCallback()

◆ SetMaxCw()

◆ SetMinCw()

◆ SetTxMiddle()

◆ SetTxopLimit()

◆ SetWifiRemoteStationManager()

◆ StartAccessIfNeeded()

◆ StartBackoffNow()

◆ UpdateBackoffSlotsNow()

◆ UpdateFailedCw()

Friends And Related Function Documentation

◆ ChannelAccessManager

◆ MacLowTransmissionListener

Member Data Documentation

◆ m_access

◆ m_aifsn

◆ m_backoff

◆ m_backoffSlots

◆ m_backoffStart

◆ m_backoffTrace

◆ m_channelAccessManager

◆ m_cw

◆ m_cwMax

◆ m_cwMin

◆ m_cwTrace

◆ m_droppedMpduCallback

◆ m_queue

◆ m_rng

◆ m_stationManager

◆ m_txMiddle