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

#include "txop.h"

Inheritance diagram for ns3::Txop:

Collaboration diagram for ns3::Txop:

Classes
struct	LinkEntity
	Structure holding information specific to a single link. More...

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

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

Public Member Functions
	Txop ()

	Txop (Ptr< WifiMacQueue > queue)
	Constructor.

	~Txop () override

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

virtual ChannelAccessStatus	GetAccessStatus (uint8_t linkId) const

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

virtual uint8_t	GetAifsn (uint8_t linkId) const
	Return the number of slots that make up an AIFS for the given link.

std::vector< uint8_t >	GetAifsns () const
	Return the number of slots that make up an AIFS for each link.

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

virtual uint32_t	GetMaxCw (uint8_t linkId) const
	Return the maximum contention window size for the given link.

std::vector< uint32_t >	GetMaxCws () const
	Return the maximum contention window size for each link.

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

virtual uint32_t	GetMinCw (uint8_t linkId) const
	Return the minimum contention window size for the given link.

std::vector< uint32_t >	GetMinCws () const
	Return the minimum contention window size for each link.

Time	GetTxopLimit () const
	Return the TXOP limit.

Time	GetTxopLimit (uint8_t linkId) const
	Return the TXOP limit for the given link.

std::vector< Time >	GetTxopLimits () const
	Return the TXOP limit for each link.

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

virtual bool	HasFramesToTransmit (uint8_t linkId)
	Check if the Txop has frames to transmit over the given link.

virtual bool	IsQosTxop () const
	Check for QoS TXOP.

virtual void	NotifyChannelAccessed (uint8_t linkId, Time txopDuration=Seconds(0))
	Called by the FrameExchangeManager to notify that channel access has been granted on the given link for the given amount of time.

virtual void	NotifyChannelReleased (uint8_t linkId)
	Called by the FrameExchangeManager to notify the completion of the transmissions.

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

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

virtual void	NotifySleep (uint8_t linkId)
	Notify that the given link switched to sleep mode.

virtual void	NotifyWakeUp (uint8_t linkId)
	When wake up operation occurs on a link, channel access on that link will be restarted.

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

virtual void	Queue (Ptr< WifiMpdu > mpdu)

void	ResetCw (uint8_t linkId)
	Update the value of the CW variable for the given link 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).

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

void	SetAifsn (uint8_t aifsn, uint8_t linkId)
	Set the number of slots that make up an AIFS for the given link.

void	SetAifsns (std::vector< uint8_t > aifsns)
	Set the number of slots that make up an AIFS for each link.

virtual void	SetDroppedMpduCallback (DroppedMpdu callback)

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

void	SetMaxCw (uint32_t maxCw, uint8_t linkId)
	Set the maximum contention window size for the given link.

void	SetMaxCws (std::vector< uint32_t > maxCws)
	Set the maximum contention window size for each link.

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

void	SetMinCw (uint32_t minCw, uint8_t linkId)
	Set the minimum contention window size for the given link.

void	SetMinCws (std::vector< uint32_t > minCws)
	Set the minimum contention window size for each link.

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

void	SetTxopLimit (Time txopLimit)
	Set the TXOP limit.

void	SetTxopLimit (Time txopLimit, uint8_t linkId)
	Set the TXOP limit for the given link.

void	SetTxopLimits (const std::vector< Time > &txopLimits)
	Set the TXOP limit for each link.

virtual void	SetWifiMac (const Ptr< WifiMac > mac)
	Set the wifi MAC this Txop is associated to.

void	StartBackoffNow (uint32_t nSlots, uint8_t linkId)

void	UpdateFailedCw (uint8_t linkId)
	Update the value of the CW variable for the given link to take into account a transmission failure.

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

	~Object () override
	Destructor.

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

void	Dispose ()
	Dispose of this Object.

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

TypeId	GetInstanceTypeId () const override
	Get the most derived TypeId for this Object.

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

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

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

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

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

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

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

	SimpleRefCount (const SimpleRefCount &o)
	Copy constructor.

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

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

void	Ref () const
	Increment the reference count.

void	Unref () const
	Decrement the reference count.

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

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

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

virtual TypeId	GetInstanceTypeId () const =0
	Get the most derived TypeId for this Object.

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

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

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

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

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

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

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

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

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

Protected Types
typedef TracedCallback< uint32_t, uint8_t >	BackoffValueTracedCallback
	TracedCallback for backoff trace value typedef.

typedef TracedCallback< uint32_t, uint8_t >	CwValueTracedCallback
	TracedCallback for CW trace value typedef.

Protected Member Functions
void	DoDispose () override
	Destructor implementation.

void	DoInitialize () override
	Initialize() implementation.

virtual void	GenerateBackoff (uint8_t linkId)
	Generate a new backoff for the given link now.

uint32_t	GetBackoffSlots (uint8_t linkId) const
	Return the current number of backoff slots on the given link.

Time	GetBackoffStart (uint8_t linkId) const
	Return the time when the backoff procedure started on the given link.

uint32_t	GetCw (uint8_t linkId) const
	Get the current value of the CW variable for the given link.

LinkEntity &	GetLink (uint8_t linkId) const
	Get a reference to the link associated with the given ID.

uint8_t	GetNLinks () const
	Get the number of links.

virtual void	NotifyAccessRequested (uint8_t linkId)
	Notify that access request has been received for the given link.

void	RequestAccess (uint8_t linkId)
	Request access to the ChannelAccessManager associated with the given link.

virtual void	StartAccessIfNeeded (uint8_t linkId)
	Request access from Txop on the given link if needed.

void	UpdateBackoffSlotsNow (uint32_t nSlots, Time backoffUpdateBound, uint8_t linkId)
	Update backoff slots for the given link that nSlots has passed.

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

virtual void	DoDispose ()
	Destructor implementation.

virtual void	DoInitialize ()
	Initialize() implementation.

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

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

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

Protected Attributes
BackoffValueTracedCallback	m_backoffTrace
	backoff trace value

CwValueTracedCallback	m_cwTrace
	CW trace value.

DroppedMpdu	m_droppedMpduCallback
	the dropped MPDU callback

Ptr< WifiMac >	m_mac
	the wifi MAC

Ptr< WifiMacQueue >	m_queue
	the wifi MAC queue

Ptr< UniformRandomVariable >	m_rng
	the random stream

Ptr< MacTxMiddle >	m_txMiddle
	the MacTxMiddle

Private Member Functions
virtual std::unique_ptr< LinkEntity >	CreateLinkEntity () const
	Create a LinkEntity object.

Private Attributes
std::vector< std::unique_ptr< LinkEntity > >	m_links
	vector of LinkEntity objects

Friends
class	ChannelAccessManager
	< ChannelAccessManager associated class

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

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::ChannelAccessManager helper class to decide when to send a packet. 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/Txop"

Attributes

Aifsn: The AIFSN: the default value conforms to non-QOS (just for the first link, in case of 11be multi-link devices).
- Set with class: ns3::UintegerValue
- Underlying type: uint8_t 0:255
- Flags: writeread
Aifsns: The values of AIFSN for all the links
- Set with class: ns3::AttributeContainerValue<N3ns313UintegerValueE, St4listIN3ns33PtrINS0_13UintegerValueEEESaIS3_EE>
- Underlying type: ns3::Ptr<N3ns313UintegerValueE>
- Flags: writeread
MaxCw: The maximum value of the contention window (just for the first link, in case of 11be multi-link devices).
- Set with class: ns3::UintegerValue
- Underlying type: uint32_t 0:4294967295
- Flags: writeread
MaxCws: The maximum values of the contention window for all the links
- Set with class: ns3::AttributeContainerValue<N3ns313UintegerValueE, St4listIN3ns33PtrINS0_13UintegerValueEEESaIS3_EE>
- Underlying type: ns3::Ptr<N3ns313UintegerValueE>
- Flags: writeread
MinCw: The minimum value of the contention window (just for the first link, in case of 11be multi-link devices).
- Set with class: ns3::UintegerValue
- Underlying type: uint32_t 0:4294967295
- Flags: writeread
MinCws: The minimum values of the contention window for all the links
- Set with class: ns3::AttributeContainerValue<N3ns313UintegerValueE, St4listIN3ns33PtrINS0_13UintegerValueEEESaIS3_EE>
- Underlying type: ns3::Ptr<N3ns313UintegerValueE>
- Flags: writeread
Queue: The WifiMacQueue object
- Set with class: ns3::PointerValue
- Underlying type: ns3::Ptr< ns3::WifiMacQueue>
- Flags: read
TxopLimit: The TXOP limit: the default value conforms to non-QoS (just for the first link, in case of 11be multi-link devices).
- Set with class: ns3::TimeValue
- Underlying type: Time +9.22337e+18ns:+9.22337e+18ns
- Flags: writeread
TxopLimits: The values of TXOP limit for all the links
- Set with class: ns3::AttributeContainerValue<N3ns39TimeValueE, St4listIN3ns33PtrINS0_9TimeValueEEESaIS3_EE>
- Underlying type: ns3::Ptr<N3ns39TimeValueE>
- Flags: writeread

TraceSources

BackoffTrace: Trace source for backoff values
Callback signature: ns3::Txop::BackoffValueTracedCallback
CwTrace: Trace source for contention window values
Callback signature: ns3::Txop::CwValueTracedCallback

Size of this type is 128 bytes (on a 64-bit architecture).

Definition at line 70 of file txop.h.

Member Typedef Documentation

◆ BackoffValueTracedCallback

typedef TracedCallback<uint32_t , uint8_t > ns3::Txop::BackoffValueTracedCallback

protected

TracedCallback for backoff trace value typedef.

Definition at line 521 of file txop.h.

◆ CwValueTracedCallback

typedef TracedCallback<uint32_t , uint8_t > ns3::Txop::CwValueTracedCallback

protected

TracedCallback for CW trace value typedef.

Definition at line 523 of file txop.h.

◆ DroppedMpdu

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

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

Definition at line 93 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 98 of file txop.h.

Constructor & Destructor Documentation

◆ Txop() [1/2]

ns3::Txop::Txop ( )

Definition at line 135 of file txop.cc.

◆ Txop() [2/2]

ns3::Txop::Txop ( Ptr< WifiMacQueue > queue )

Constructor.

Parameters

queue the wifi MAC queue

Definition at line 140 of file txop.cc.

References m_rng, and NS_LOG_FUNCTION.

◆ ~Txop()

ns3::Txop::~Txop ( )

override

Definition at line 147 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 530 of file txop.cc.

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

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◆ CreateLinkEntity()

std::unique_ptr< Txop::LinkEntity > ns3::Txop::CreateLinkEntity ( ) const

privatevirtual

Create a LinkEntity object.

Returns: a unique pointer to the created LinkEntity object

Reimplemented in ns3::QosTxop.

Definition at line 164 of file txop.cc.

Referenced by SetWifiMac().

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◆ DoDispose()

void ns3::Txop::DoDispose ( )

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 153 of file txop.cc.

References m_links, m_mac, m_queue, m_rng, m_txMiddle, and NS_LOG_FUNCTION.

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

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◆ DoInitialize()

void ns3::Txop::DoInitialize ( )

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 548 of file txop.cc.

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

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◆ GenerateBackoff()

void ns3::Txop::GenerateBackoff ( uint8_t linkId )

protectedvirtual

Generate a new backoff for the given link now.

Parameters

linkId the ID of the given link

Definition at line 601 of file txop.cc.

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

Referenced by DoInitialize(), NotifyChannelReleased(), and Queue().

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◆ GetAccessStatus()

Txop::ChannelAccessStatus ns3::Txop::GetAccessStatus ( uint8_t linkId ) const

virtual

Parameters

linkId the ID of the given link

Returns: the current channel access status for the given link

Definition at line 559 of file txop.cc.

References ns3::Txop::LinkEntity::access, and GetLink().

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◆ GetAifsn() [1/2]

uint8_t ns3::Txop::GetAifsn ( ) const

Return the number of slots that make up an AIFS.

For 11be multi-link devices, return the number of slots that make up an AIFS on the first link.

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

Definition at line 446 of file txop.cc.

References GetAifsn().

Referenced by WifiTxopTest::DoRun(), GetAifsn(), GetAifsns(), and GetTypeId().

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◆ GetAifsn() [2/2]

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

virtual

Return the number of slots that make up an AIFS for the given link.

Parameters

linkId the ID of the given link

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

Reimplemented in ns3::QosTxop.

Definition at line 463 of file txop.cc.

References ns3::Txop::LinkEntity::aifsn, and GetLink().

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◆ GetAifsns()

std::vector< uint8_t > ns3::Txop::GetAifsns ( ) const

Return the number of slots that make up an AIFS for each link.

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

Definition at line 452 of file txop.cc.

References GetAifsn(), and m_links.

Referenced by GetTypeId().

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◆ GetBackoffSlots()

uint32_t ns3::Txop::GetBackoffSlots ( uint8_t linkId ) const

protected

Return the current number of backoff slots on the given link.

Parameters

linkId the ID of the given link

Returns: the current number of backoff slots

Definition at line 308 of file txop.cc.

References ns3::Txop::LinkEntity::backoffSlots, and GetLink().

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◆ GetBackoffStart()

Time ns3::Txop::GetBackoffStart ( uint8_t linkId ) const

protected

Return the time when the backoff procedure started on the given link.

Parameters

linkId the ID of the given link

Returns: the time when the backoff procedure started

Definition at line 314 of file txop.cc.

References ns3::Txop::LinkEntity::backoffStart, and GetLink().

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◆ GetCw()

uint32_t ns3::Txop::GetCw ( uint8_t linkId ) const

protected

Get the current value of the CW variable for the given link.

The initial value is minCw.

Parameters

linkId the ID of the given link

Returns: the current value of the CW variable for the given link

Definition at line 281 of file txop.cc.

References ns3::Txop::LinkEntity::cw, and GetLink().

Referenced by GenerateBackoff().

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◆ GetLink()

Txop::LinkEntity & ns3::Txop::GetLink ( uint8_t linkId ) const

protected

Get a reference to the link associated with the given ID.

Parameters

linkId the given link ID

Returns: a reference to the link associated with the given ID

Definition at line 170 of file txop.cc.

References m_links, and NS_ASSERT.

Referenced by GetAccessStatus(), GetAifsn(), GetBackoffSlots(), GetBackoffStart(), GetCw(), ns3::QosTxop::GetLink(), GetMaxCw(), GetMinCw(), GetTxopLimit(), NotifyAccessRequested(), NotifyChannelAccessed(), TxopTest< TxopType >::NotifyChannelAccessed(), NotifyChannelReleased(), RequestAccess(), ResetCw(), SetAifsn(), SetMaxCw(), SetMinCw(), SetTxopLimit(), StartAccessIfNeeded(), StartBackoffNow(), UpdateBackoffSlotsNow(), and UpdateFailedCw().

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◆ GetMaxCw() [1/2]

uint32_t ns3::Txop::GetMaxCw ( ) const

Return the maximum contention window size.

For 11be multi-link devices, return the maximum contention window size on the first link.

Returns: the maximum contention window size.

Definition at line 423 of file txop.cc.

References GetMaxCw().

Referenced by GetMaxCw(), GetMaxCws(), GetTypeId(), and UpdateFailedCw().

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◆ GetMaxCw() [2/2]

uint32_t ns3::Txop::GetMaxCw ( uint8_t linkId ) const

virtual

Return the maximum contention window size for the given link.

Parameters

linkId the ID of the given link

Returns: the maximum contention window size.

Reimplemented in ns3::QosTxop.

Definition at line 440 of file txop.cc.

References ns3::Txop::LinkEntity::cwMax, and GetLink().

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◆ GetMaxCws()

std::vector< uint32_t > ns3::Txop::GetMaxCws ( ) const

Return the maximum contention window size for each link.

Returns: the maximum contention window size values.

Definition at line 429 of file txop.cc.

References GetMaxCw(), and m_links.

Referenced by GetTypeId().

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◆ GetMinCw() [1/2]

uint32_t ns3::Txop::GetMinCw ( ) const

Return the minimum contention window size.

For 11be multi-link devices, return the minimum contention window size on the first link.

Returns: the minimum contention window size.

Definition at line 400 of file txop.cc.

References GetMinCw().

Referenced by WifiTxopTest::DoRun(), GetMinCw(), GetMinCws(), GetTypeId(), ResetCw(), and UpdateFailedCw().

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◆ GetMinCw() [2/2]

uint32_t ns3::Txop::GetMinCw ( uint8_t linkId ) const

virtual

Return the minimum contention window size for the given link.

Parameters

linkId the ID of the given link

Returns: the minimum contention window size.

Reimplemented in ns3::QosTxop.

Definition at line 417 of file txop.cc.

References ns3::Txop::LinkEntity::cwMin, and GetLink().

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◆ GetMinCws()

std::vector< uint32_t > ns3::Txop::GetMinCws ( ) const

Return the minimum contention window size for each link.

Returns: the minimum contention window size values.

Definition at line 406 of file txop.cc.

References GetMinCw(), and m_links.

Referenced by GetTypeId().

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◆ GetNLinks()

uint8_t ns3::Txop::GetNLinks ( ) const

protected

Get the number of links.

Returns: the number of links

Definition at line 178 of file txop.cc.

References m_links.

Referenced by ns3::QosTxop::GotAddBaResponse(), and ns3::QosTxop::NotifyOriginatorAgreementNoReply().

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◆ GetTxopLimit() [1/2]

Time ns3::Txop::GetTxopLimit ( ) const

Return the TXOP limit.

Returns: the TXOP limit.

Definition at line 469 of file txop.cc.

References GetTxopLimit().

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◆ GetTxopLimit() [2/2]

Time ns3::Txop::GetTxopLimit ( uint8_t linkId ) const

Return the TXOP limit for the given link.

Parameters

linkId the ID of the given link

Returns: the TXOP limit.

Definition at line 486 of file txop.cc.

References GetLink(), and ns3::Txop::LinkEntity::txopLimit.

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◆ GetTxopLimits()

std::vector< Time > ns3::Txop::GetTxopLimits ( ) const

Return the TXOP limit for each link.

Returns: the TXOP limit for each link.

Definition at line 475 of file txop.cc.

References GetTxopLimit(), and m_links.

Referenced by GetTypeId().

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◆ GetTypeId()

TypeId ns3::Txop::GetTypeId ( )

static

Get the type ID.

Returns: the object TypeId

Definition at line 51 of file txop.cc.

References ns3::TypeId::ATTR_GET, ns3::TypeId::ATTR_SET, GetAifsn(), GetAifsns(), GetMaxCw(), GetMaxCws(), GetMinCw(), GetMinCws(), GetTxopLimit(), GetTxopLimits(), GetWifiMacQueue(), m_backoffTrace, m_cwTrace, ns3::MakePointerAccessor(), ns3::MakeTimeAccessor(), ns3::MakeTimeChecker(), ns3::MakeTraceSourceAccessor(), ns3::MakeUintegerAccessor(), ns3::MilliSeconds(), SetAifsn(), SetAifsns(), SetMaxCw(), SetMaxCws(), SetMinCw(), SetMinCws(), ns3::TypeId::SetParent(), SetTxopLimit(), and SetTxopLimits().

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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 216 of file txop.cc.

References m_queue, and NS_LOG_FUNCTION.

Referenced by AmpduAggregationTest::DoRun(), TwoLevelAggregationTest::DoRun(), HeAggregationTest::DoRunSubTest(), ns3::ApWifiMac::GetTxopQueue(), GetTypeId(), ns3::FrameExchangeManager::ReceivedNormalAck(), ns3::HtFrameExchangeManager::SendAddBaRequest(), ns3::HtFrameExchangeManager::SendDelbaFrame(), and OfdmaAckSequenceTest::Transmit().

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◆ HasFramesToTransmit()

bool ns3::Txop::HasFramesToTransmit ( uint8_t linkId )

virtual

Check if the Txop has frames to transmit over the given link.

Parameters

linkId the ID of the given link.

Returns: true if the Txop has frames to transmit.

Reimplemented in ns3::QosTxop.

Definition at line 492 of file txop.cc.

References m_queue, and NS_LOG_FUNCTION.

Referenced by ns3::WifiMac::HasFramesToTransmit(), NotifyChannelReleased(), and StartAccessIfNeeded().

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◆ IsQosTxop()

bool ns3::Txop::IsQosTxop ( ) const

virtual

Check for QoS TXOP.

Returns: true if QoS TXOP.

Reimplemented in ns3::QosTxop.

Definition at line 640 of file txop.cc.

◆ NotifyAccessRequested()

void ns3::Txop::NotifyAccessRequested ( uint8_t linkId )

protectedvirtual

Notify that access request has been received for the given link.

Parameters

linkId the ID of the given link

Definition at line 565 of file txop.cc.

References ns3::Txop::LinkEntity::access, GetLink(), NS_LOG_FUNCTION, and REQUESTED.

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◆ NotifyChannelAccessed()

void ns3::Txop::NotifyChannelAccessed	(	uint8_t	linkId,
		Time	txopDuration = `Seconds(0)`
	)

virtual

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

Parameters

linkId	the ID of the given link
txopDuration	the duration of the TXOP gained (zero for DCF)

Reimplemented in ns3::QosTxop.

Definition at line 572 of file txop.cc.

References ns3::Txop::LinkEntity::access, GetLink(), GRANTED, and NS_LOG_FUNCTION.

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

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◆ NotifyChannelReleased()

void ns3::Txop::NotifyChannelReleased ( uint8_t linkId )

virtual

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

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

Parameters

linkId the ID of the link the FrameExchangeManager is operating on

Reimplemented in ns3::QosTxop.

Definition at line 579 of file txop.cc.

References ns3::Txop::LinkEntity::access, GenerateBackoff(), GetLink(), HasFramesToTransmit(), NOT_REQUESTED, NS_LOG_FUNCTION, RequestAccess(), and ns3::Simulator::ScheduleNow().

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

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◆ NotifyOff()

void ns3::Txop::NotifyOff ( )

virtual

When off operation occurs, the queue gets cleaned up.

Definition at line 616 of file txop.cc.

References m_queue, and NS_LOG_FUNCTION.

◆ NotifyOn()

void ns3::Txop::NotifyOn ( )

virtual

When on operation occurs, channel access will be started.

Definition at line 630 of file txop.cc.

References m_links, NS_LOG_FUNCTION, and StartAccessIfNeeded().

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◆ NotifySleep()

void ns3::Txop::NotifySleep ( uint8_t linkId )

virtual

Notify that the given link switched to sleep mode.

Parameters

linkId the ID of the given link

Definition at line 610 of file txop.cc.

References NS_LOG_FUNCTION.

◆ NotifyWakeUp()

void ns3::Txop::NotifyWakeUp ( uint8_t linkId )

virtual

When wake up operation occurs on a link, channel access on that link will be restarted.

Parameters

linkId the ID of the link

Definition at line 623 of file txop.cc.

References NS_LOG_FUNCTION, and StartAccessIfNeeded().

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◆ Queue() [1/2]

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 501 of file txop.cc.

References NS_LOG_FUNCTION.

Referenced by ns3::AdhocWifiMac::Enqueue(), ns3::StaWifiMac::Enqueue(), ns3::MeshWifiInterfaceMac::ForwardDown(), ns3::ApWifiMac::ForwardDown(), ns3::HtFrameExchangeManager::SendAddBaResponse(), ns3::StaWifiMac::SendAssociationRequest(), ns3::ApWifiMac::SendAssocResp(), ns3::MeshWifiInterfaceMac::SendBeacon(), ns3::MeshWifiInterfaceMac::SendManagementFrame(), ns3::ApWifiMac::SendOneBeacon(), ns3::StaWifiMac::SendProbeRequest(), ns3::ApWifiMac::SendProbeResp(), and ns3::StaWifiMac::SetPowerSaveMode().

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◆ Queue() [2/2]

void ns3::Txop::Queue ( Ptr< WifiMpdu > mpdu )

virtual

Parameters

mpdu	the given MPDU

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

Definition at line 511 of file txop.cc.

References GenerateBackoff(), ns3::WifiMac::GetChannelAccessManager(), ns3::WifiMac::GetMacQueueScheduler(), m_mac, m_queue, ns3::ChannelAccessManager::NeedBackoffUponAccess(), NS_LOG_FUNCTION, and StartAccessIfNeeded().

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◆ RequestAccess()

void ns3::Txop::RequestAccess ( uint8_t linkId )

protected

Request access to the ChannelAccessManager associated with the given link.

Parameters

linkId the ID of the given link

Definition at line 591 of file txop.cc.

References ns3::WifiMac::GetChannelAccessManager(), GetLink(), m_mac, NOT_REQUESTED, NS_LOG_FUNCTION, and ns3::ChannelAccessManager::RequestAccess().

Referenced by NotifyChannelReleased().

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◆ ResetCw()

void ns3::Txop::ResetCw ( uint8_t linkId )

Update the value of the CW variable for the given link 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.

Parameters

linkId the ID of the given link

Definition at line 287 of file txop.cc.

References GetLink(), GetMinCw(), m_cwTrace, and NS_LOG_FUNCTION.

Referenced by ns3::HtFrameExchangeManager::BlockAckTimeout(), ns3::HeFrameExchangeManager::CtsAfterMuRtsTimeout(), ns3::FrameExchangeManager::DoCtsTimeout(), DoInitialize(), ns3::FrameExchangeManager::NormalAckTimeout(), ns3::FrameExchangeManager::ReceivedNormalAck(), ns3::HtFrameExchangeManager::ReceiveMpdu(), SetMaxCw(), and SetMinCw().

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◆ SetAifsn() [1/2]

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

Set the number of slots that make up an AIFS.

For 11be multi-link devices, set the number of slots that make up an AIFS on the first link.

Parameters

aifsn the number of slots that make up an AIFS.

Definition at line 349 of file txop.cc.

References SetAifsn().

Referenced by ns3::MeshWifiInterfaceMac::ConfigureContentionWindow(), GetTypeId(), SetAifsn(), and SetAifsns().

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◆ SetAifsn() [2/2]

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

Set the number of slots that make up an AIFS for the given link.

Parameters

aifsn	the number of slots that make up an AIFS.
linkId	the ID of the given link

Definition at line 365 of file txop.cc.

References ns3::Txop::LinkEntity::aifsn, GetLink(), and NS_LOG_FUNCTION.

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◆ SetAifsns()

void ns3::Txop::SetAifsns ( std::vector< uint8_t > aifsns )

Set the number of slots that make up an AIFS for each link.

Note that the size of aifsns must match the number of links.

Parameters

aifsns the number of slots that make up an AIFS for each link.

Definition at line 355 of file txop.cc.

References m_links, NS_ABORT_IF, and SetAifsn().

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

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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 205 of file txop.cc.

References ns3::Callback< R, UArgs >::Bind(), m_droppedMpduCallback, m_queue, NS_LOG_FUNCTION, ns3::WIFI_MAC_DROP_EXPIRED_LIFETIME, and ns3::WIFI_MAC_DROP_FAILED_ENQUEUE.

Referenced by ns3::QosTxop::SetDroppedMpduCallback(), and ns3::WifiMac::SetQosSupported().

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◆ SetMaxCw() [1/2]

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

Set the maximum contention window size.

For 11be multi-link devices, set the maximum contention window size on the first link.

Parameters

maxCw the maximum contention window size.

Definition at line 252 of file txop.cc.

References SetMaxCw().

Referenced by ns3::MeshWifiInterfaceMac::ConfigureContentionWindow(), GetTypeId(), SetMaxCw(), and SetMaxCws().

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◆ SetMaxCw() [2/2]

void ns3::Txop::SetMaxCw	(	uint32_t	maxCw,
		uint8_t	linkId
	)

Set the maximum contention window size for the given link.

Parameters

maxCw	the maximum contention window size.
linkId	the ID of the given link

Definition at line 268 of file txop.cc.

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

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◆ SetMaxCws()

void ns3::Txop::SetMaxCws ( std::vector< uint32_t > maxCws )

Set the maximum contention window size for each link.

Note that the size of maxCws must match the number of links.

Parameters

maxCws the maximum contention window size values.

Definition at line 258 of file txop.cc.

References m_links, NS_ABORT_IF, and SetMaxCw().

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

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◆ SetMinCw() [1/2]

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

Set the minimum contention window size.

For 11be multi-link devices, set the minimum contention window size on the first link.

Parameters

minCw the minimum contention window size.

Definition at line 223 of file txop.cc.

References SetMinCw().

Referenced by ns3::MeshWifiInterfaceMac::ConfigureContentionWindow(), GetTypeId(), SetMinCw(), and SetMinCws().

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◆ SetMinCw() [2/2]

void ns3::Txop::SetMinCw	(	uint32_t	minCw,
		uint8_t	linkId
	)

Set the minimum contention window size for the given link.

Parameters

minCw	the minimum contention window size.
linkId	the ID of the given link

Definition at line 239 of file txop.cc.

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

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◆ SetMinCws()

void ns3::Txop::SetMinCws ( std::vector< uint32_t > minCws )

Set the minimum contention window size for each link.

Note that the size of minCws must match the number of links.

Parameters

minCws the minimum contention window size values.

Definition at line 229 of file txop.cc.

References m_links, NS_ABORT_IF, and SetMinCw().

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

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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 184 of file txop.cc.

References m_txMiddle, and NS_LOG_FUNCTION.

Referenced by ns3::ApWifiMac::ApWifiMac(), ns3::MeshWifiInterfaceMac::ConfigureContentionWindow(), and ns3::WifiMac::SetQosSupported().

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◆ SetTxopLimit() [1/2]

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

Set the TXOP limit.

Parameters

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

Definition at line 372 of file txop.cc.

References SetTxopLimit().

Referenced by GetTypeId(), SetTxopLimit(), and SetTxopLimits().

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◆ SetTxopLimit() [2/2]

void ns3::Txop::SetTxopLimit	(	Time	txopLimit,
		uint8_t	linkId
	)

Set the TXOP limit for the given link.

Parameters

txopLimit	the TXOP limit. Value zero corresponds to default Txop.
linkId	the ID of the given link

Definition at line 391 of file txop.cc.

References GetLink(), ns3::Time::GetMicroSeconds(), NS_ASSERT_MSG, NS_LOG_FUNCTION, and ns3::Txop::LinkEntity::txopLimit.

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◆ SetTxopLimits()

void ns3::Txop::SetTxopLimits ( const std::vector< Time > & txopLimits )

Set the TXOP limit for each link.

Note that the size of txopLimits must match the number of links.

Parameters

txopLimits the TXOP limit for each link.

Definition at line 378 of file txop.cc.

References m_links, NS_ABORT_MSG_IF, and SetTxopLimit().

Referenced by EmlsrDlTxopTest::DoSetup(), and GetTypeId().

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◆ SetWifiMac()

void ns3::Txop::SetWifiMac ( const Ptr< WifiMac > mac )

virtual

Set the wifi MAC this Txop is associated to.

Parameters

mac	associated wifi MAC

Definition at line 191 of file txop.cc.

References CreateLinkEntity(), ns3::WifiMac::GetNLinks(), m_links, m_mac, and NS_LOG_FUNCTION.

Referenced by ns3::MeshWifiInterfaceMac::ConfigureContentionWindow(), ns3::WifiMac::ConfigureStandard(), and ns3::ApWifiMac::ConfigureStandard().

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◆ StartAccessIfNeeded()

void ns3::Txop::StartAccessIfNeeded ( uint8_t linkId )

protectedvirtual

Request access from Txop on the given link if needed.

Parameters

linkId the ID of the given link

Definition at line 538 of file txop.cc.

References ns3::WifiMac::GetChannelAccessManager(), GetLink(), HasFramesToTransmit(), m_mac, NOT_REQUESTED, NS_LOG_FUNCTION, and ns3::ChannelAccessManager::RequestAccess().

Referenced by ns3::QosTxop::GotAddBaResponse(), NotifyOn(), ns3::QosTxop::NotifyOriginatorAgreementNoReply(), NotifyWakeUp(), and Queue().

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◆ StartBackoffNow()

void ns3::Txop::StartBackoffNow	(	uint32_t	nSlots,
		uint8_t	linkId
	)

Parameters

nSlots	the number of slots of the backoff.
linkId	the ID of the given link

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

Definition at line 331 of file txop.cc.

References GetLink(), 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,
		uint8_t	linkId
	)

protected

Update backoff slots for the given link that nSlots has passed.

Parameters

nSlots	the number of slots to decrement
backoffUpdateBound	the time at which backoff should start
linkId	the ID of the given link

Definition at line 320 of file txop.cc.

References GetLink(), NS_LOG_DEBUG, and NS_LOG_FUNCTION.

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◆ UpdateFailedCw()

void ns3::Txop::UpdateFailedCw ( uint8_t linkId )

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

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

Parameters

linkId the ID of the given link

Definition at line 296 of file txop.cc.

References GetLink(), GetMaxCw(), GetMinCw(), m_cwTrace, and NS_LOG_FUNCTION.

Referenced by ns3::HtFrameExchangeManager::BlockAckTimeout(), ns3::HeFrameExchangeManager::CtsAfterMuRtsTimeout(), ns3::FrameExchangeManager::DoCtsTimeout(), and ns3::FrameExchangeManager::NormalAckTimeout().

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Friends And Related Function Documentation

◆ ChannelAccessManager

friend class ChannelAccessManager

friend

< ChannelAccessManager associated class

Definition at line 413 of file txop.h.

Member Data Documentation

◆ m_backoffTrace

BackoffValueTracedCallback ns3::Txop::m_backoffTrace

protected

backoff trace value

Definition at line 525 of file txop.h.

Referenced by GenerateBackoff(), and GetTypeId().

◆ m_cwTrace

CwValueTracedCallback ns3::Txop::m_cwTrace

protected

CW trace value.

Definition at line 526 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 514 of file txop.h.

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

◆ m_links

std::vector<std::unique_ptr<LinkEntity> > ns3::Txop::m_links

private

vector of LinkEntity objects

Definition at line 536 of file txop.h.

Referenced by DoDispose(), DoInitialize(), GetAifsns(), GetLink(), GetMaxCws(), GetMinCws(), GetNLinks(), GetTxopLimits(), NotifyOn(), SetAifsns(), SetMaxCws(), SetMinCws(), SetTxopLimits(), and SetWifiMac().

◆ m_mac

Ptr<WifiMac> ns3::Txop::m_mac

protected

the wifi MAC

Definition at line 517 of file txop.h.

Referenced by ns3::QosTxop::QosTxop(), ns3::QosTxop::CompleteMpduTx(), DoDispose(), ns3::QosTxop::GetNextMpdu(), ns3::QosTxop::IsQosOldPacket(), ns3::QosTxop::PeekNextMpdu(), ns3::QosTxop::PrepareBlockAckRequest(), Queue(), RequestAccess(), SetWifiMac(), StartAccessIfNeeded(), and ns3::QosTxop::StartMuEdcaTimerNow().

◆ m_queue

Ptr<WifiMacQueue> ns3::Txop::m_queue

protected

the wifi MAC queue

Definition at line 515 of file txop.h.

Referenced by ns3::QosTxop::QosTxop(), ns3::QosTxop::AssignSequenceNumber(), ns3::QosTxop::CompleteMpduTx(), DoDispose(), ns3::QosTxop::GetQosQueueSize(), GetWifiMacQueue(), ns3::QosTxop::GotAddBaResponse(), HasFramesToTransmit(), ns3::QosTxop::HasFramesToTransmit(), NotifyOff(), ns3::QosTxop::PeekNextMpdu(), Queue(), and SetDroppedMpduCallback().

◆ m_rng

Ptr<UniformRandomVariable> ns3::Txop::m_rng

protected

the random stream

Definition at line 518 of file txop.h.

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

◆ m_txMiddle

Ptr<MacTxMiddle> ns3::Txop::m_txMiddle

protected

the MacTxMiddle

Definition at line 516 of file txop.h.

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

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

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

Classes

Public Types

Public Member Functions

Static Public Member Functions

Protected Types

Protected Member Functions

Protected Attributes

Private Member Functions

Private Attributes

Friends

Additional Inherited Members

Detailed Description

Config Paths

Attributes

TraceSources

Member Typedef Documentation

◆ BackoffValueTracedCallback

◆ CwValueTracedCallback

◆ DroppedMpdu

Member Enumeration Documentation

◆ ChannelAccessStatus

Constructor & Destructor Documentation

◆ Txop() [1/2]

◆ Txop() [2/2]

◆ ~Txop()

Member Function Documentation

◆ AssignStreams()

◆ CreateLinkEntity()

◆ DoDispose()

◆ DoInitialize()

◆ GenerateBackoff()

◆ GetAccessStatus()

◆ GetAifsn() [1/2]

◆ GetAifsn() [2/2]

◆ GetAifsns()

◆ GetBackoffSlots()

◆ GetBackoffStart()

◆ GetCw()

◆ GetLink()

◆ GetMaxCw() [1/2]

◆ GetMaxCw() [2/2]

◆ GetMaxCws()

◆ GetMinCw() [1/2]

◆ GetMinCw() [2/2]

◆ GetMinCws()

◆ GetNLinks()

◆ GetTxopLimit() [1/2]

◆ GetTxopLimit() [2/2]

◆ GetTxopLimits()

◆ GetTypeId()

◆ GetWifiMacQueue()

◆ HasFramesToTransmit()

◆ IsQosTxop()

◆ NotifyAccessRequested()

◆ NotifyChannelAccessed()

◆ NotifyChannelReleased()

◆ NotifyOff()

◆ NotifyOn()

◆ NotifySleep()

◆ NotifyWakeUp()

◆ Queue() [1/2]

◆ Queue() [2/2]

◆ RequestAccess()

◆ ResetCw()

◆ SetAifsn() [1/2]

◆ SetAifsn() [2/2]

◆ SetAifsns()

◆ SetDroppedMpduCallback()

◆ SetMaxCw() [1/2]

◆ SetMaxCw() [2/2]

◆ SetMaxCws()

◆ SetMinCw() [1/2]

◆ SetMinCw() [2/2]

◆ SetMinCws()

◆ SetTxMiddle()

◆ SetTxopLimit() [1/2]

◆ SetTxopLimit() [2/2]

◆ SetTxopLimits()

◆ SetWifiMac()

◆ StartAccessIfNeeded()