Handle packet fragmentation and retransmissions for QoS data frames as well as MSDU aggregation (A-MSDU) and block ack sessions, for a given access class. More...

#include "qos-txop.h"

Inheritance diagram for ns3::QosTxop:

Collaboration diagram for ns3::QosTxop:

Public Member Functions
	QosTxop ()

virtual	~QosTxop ()

void	BaTxFailed (const WifiMacHeader &hdr)
	The packet we sent was successfully received by the receiver. More...

void	BaTxOk (const WifiMacHeader &hdr)
	The packet we sent was successfully received by the receiver. More...

void	CompleteConfig (void)
	Complete block ack configuration. More...

void	CompleteMpduTx (Ptr< WifiMacQueueItem > mpdu)
	Stores an MPDU (part of an A-MPDU) in block ack agreement (i.e. More...

Ptr< WifiMacQueueItem >	DequeuePeekedFrame (Ptr< const WifiMacQueueItem > peekedItem, WifiTxVector txVector, bool aggregate=true, uint32_t ampduSize=0, Time ppduDurationLimit=Time::Min())
	Dequeue the frame that has been previously peeked by calling PeekNextFrame. More...

void	EndTxNoAck (void)
	Event handler when a transmission that does not require an Ack has completed. More...

Ptr< WifiAckPolicySelector >	GetAckPolicySelector (void) const
	Return the ack policy selector. More...

Time	GetAddBaResponseTimeout (void) const
	Get the timeout for ADDBA response. More...

bool	GetAmpduExist (Mac48Address dest) const
	Return whether A-MPDU is used to transmit data to a peer station. More...

bool	GetBaAgreementEstablished (Mac48Address address, uint8_t tid) const

uint16_t	GetBaBufferSize (Mac48Address address, uint8_t tid) const

uint16_t	GetBaStartingSequence (Mac48Address address, uint8_t tid) const

uint8_t	GetBlockAckThreshold (void) const
	Return the current threshold for block ack mechanism. More...

Time	GetFailedAddBaTimeout (void) const
	Get the timeout for failed BA agreement. More...

Ptr< Packet >	GetFragmentPacket (WifiMacHeader *hdr)
	Get the next fragment from the packet with appropriate Wifi header for the fragment. More...

uint16_t	GetNextSequenceNumberFor (const WifiMacHeader *hdr)
	Return the next sequence number for the given header. More...

MacLowTransmissionParameters	GetTransmissionParameters (Ptr< const WifiMacQueueItem > frame) const
	Compute the MacLow transmission parameters for the given frame. More...

Time	GetTxopRemaining (void) const
	Return the remaining duration in the current TXOP. More...

TypeOfStation	GetTypeOfStation (void) const
	Return type of station. More...

void	GotAck (void)
	Event handler when an Ack is received. More...

void	GotAddBaResponse (const MgtAddBaResponseHeader *respHdr, Mac48Address recipient)
	Event handler when an ADDBA response is received. More...

void	GotBlockAck (const CtrlBAckResponseHeader *blockAck, Mac48Address recipient, double rxSnr, double dataSnr, WifiTxVector dataTxVector)
	Event handler when a BlockAck is received. More...

void	GotDelBaFrame (const MgtDelBaHeader *delBaHdr, Mac48Address recipient)
	Event handler when a DELBA frame is received. More...

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

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

Mac48Address	MapDestAddressForAggregation (const WifiMacHeader &hdr)
	This functions are used only to correctly set destination address in A-MSDU subframes. More...

Mac48Address	MapSrcAddressForAggregation (const WifiMacHeader &hdr)
	This functions are used only to correctly set source address in A-MSDU subframes. More...

void	MissedAck (void)
	Event handler when an Ack is missed. More...

void	MissedBlockAck (uint8_t nMpdus)
	Event handler when a BlockAck timeout has occurred. More...

bool	NeedBarRetransmission (void)
	Check if BlockAckRequest should be re-transmitted. More...

bool	NeedFragmentation (void) const
	Check if the current packet should be fragmented. More...

void	NotifyAccessGranted (void)
	Notify the Txop that access has been granted. More...

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

void	NotifyMissedCts (std::list< Ptr< WifiMacQueueItem >> mpduList)
	Event handler when a CTS timeout has occurred. More...

Ptr< const WifiMacQueueItem >	PeekNextFrame (uint8_t tid=8, Mac48Address recipient=Mac48Address::GetBroadcast())
	Peek the next frame to transmit to the given receiver and of the given TID from the block ack manager retransmit queue first and, if not found, from the EDCA queue. More...

uint16_t	PeekNextSequenceNumberFor (const WifiMacHeader *hdr)
	Return the next sequence number for the Traffic ID and destination, but do not pick it (i.e. More...

Ptr< const WifiMacQueueItem >	PrepareBlockAckRequest (Mac48Address recipient, uint8_t tid) const

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

void	RestartAccessIfNeeded (void)
	Restart access request if needed. More...

void	ScheduleBar (Ptr< const WifiMacQueueItem > bar, bool skipIfNoDataQueued=false)

void	SendDelbaFrame (Mac48Address addr, uint8_t tid, bool byOriginator)
	Sends DELBA frame to cancel a block ack agreement with STA addressed by addr for TID tid. More...

void	SetAccessCategory (AcIndex ac)
	Set the access category of this EDCAF. More...

void	SetAckPolicySelector (Ptr< WifiAckPolicySelector > ackSelector)
	Set the ack policy selector. More...

void	SetAddBaResponseTimeout (Time addBaResponseTimeout)
	Set the timeout to wait for ADDBA response. More...

void	SetAmpduExist (Mac48Address dest, bool enableAmpdu)
	Set indication whether A-MPDU is used to transmit data to a peer station. More...

void	SetBlockAckInactivityTimeout (uint16_t timeout)
	Set the BlockAck inactivity timeout. More...

void	SetBlockAckThreshold (uint8_t threshold)
	Set threshold for block ack mechanism. More...

void	SetFailedAddBaTimeout (Time failedAddBaTimeout)
	Set the timeout for failed BA agreement. More...

void	SetTypeOfStation (TypeOfStation type)
	Set type of station with the given type. More...

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

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

void	StartNextPacket (void)
	Start transmission for the next packet if allowed by the TxopLimit. More...

void	UpdateCurrentPacket (Ptr< WifiMacQueueItem > mpdu)
	Update the current packet this QosTxop is trying to transmit. More...

Public Member Functions inherited from ns3::Txop
	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 void	Cancel (void)
	Cancel the transmission. More...

bool	CanStartNextPolling (void) const
	Check if the next PCF transmission can fit in the remaining CFP duration. More...

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

Ptr< MacLow >	GetLow (void) const
	Return the MacLow associated with this Txop. 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...

void	GotCfEnd (void)
	Event handler when a CF-END frame is received. More...

virtual bool	IsAccessRequested (void) const

void	MissedCfPollResponse (bool expectedCfAck)
	Event handler when a response to a CF-POLL frame is missed. More...

virtual void	MissedCts (void)
	Event handler when a CTS timeout has occurred. 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	SendCfFrame (WifiMacType frameType, Mac48Address addr)
	Sends CF frame to STA with address addr. 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...

void	SetMacLow (const Ptr< MacLow > low)
	Set MacLow associated with this Txop. More...

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	SetTxDroppedCallback (TxDropped callback)

void	SetTxFailedCallback (TxFailed callback)

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

void	SetTxOkCallback (TxOk callback)

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

void	StartBackoffNow (uint32_t nSlots)

virtual void	StartNextFragment (void)
	Start transmission for the next fragment. 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<typename T >
Ptr< T >	GetObject (void) const
	Get a pointer to the requested aggregated 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 () const

template<>
Ptr< Object >	GetObject (TypeId tid) const

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::Txop
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...

Public Attributes
std::map< Mac48Address, bool >	m_aMpduEnabled
	list containing flags whether A-MPDU is enabled for a given destination address More...

Private Member Functions
void	AddBaResponseTimeout (Mac48Address recipient, uint8_t tid)
	Callback when ADDBA response is not received after timeout. More...

void	DoDispose (void)
	Destructor implementation. More...

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

uint32_t	GetFragmentOffset (void) const
	Calculate the offset for the current fragment. More...

uint32_t	GetFragmentSize (void) const
	Calculate the size of the current fragment. More...

uint32_t	GetNextFragmentSize (void) const
	Calculate the size of the next fragment. More...

uint32_t	GetNextTxopFragmentSize (uint32_t fragmentNumber) const
	Calculate the size of the next TXOP fragment. More...

uint32_t	GetNTxopFragment (void) const
	Calculate the number of TXOP fragments needed for the transmission of the current packet. More...

uint32_t	GetTxopFragmentOffset (uint32_t fragmentNumber) const
	Calculate the offset for the fragment. More...

uint32_t	GetTxopFragmentSize (void) const
	Calculate the size of the current TXOP fragment. More...

bool	IsLastFragment (void) const
	Check if the current fragment is the last fragment. More...

bool	IsQosOldPacket (Ptr< const WifiMacQueueItem > mpdu)
	Check if the given MPDU is to be considered old according to the current starting sequence number of the transmit window, provided that a block ack agreement has been established with the recipient for the given TID. More...

bool	IsTxopFragmentation (void) const
	Check if the current packet is fragmented because of an exceeded TXOP duration. More...

void	ResetBa (Mac48Address recipient, uint8_t tid)
	Reset BA agreement after BA negotiation failed. More...

void	SendAddBaRequest (Mac48Address recipient, uint8_t tid, uint16_t startSeq, uint16_t timeout, bool immediateBAck)
	Sends an ADDBA Request to establish a block ack agreement with STA addressed by recipient for TID tid. More...

bool	SetupBlockAckIfNeeded (void)
	If number of packets in the queue reaches m_blockAckThreshold value, an ADDBA Request frame is sent to destination in order to setup a block ack. More...

void	TerminateTxop (void)
	Update backoff and restart access if needed. More...

Private Attributes
AcIndex	m_ac
	the access category More...

Ptr< WifiAckPolicySelector >	m_ackPolicySelector
	the ack policy selector More...

Time	m_addBaResponseTimeout
	timeout for ADDBA response More...

Ptr< BlockAckManager >	m_baManager
	the block ack manager More...

uint16_t	m_blockAckInactivityTimeout
	the BlockAck inactivity timeout value (in TUs, i.e. More...

uint8_t	m_blockAckThreshold
	the block ack threshold (use BA mechanism if number of packets in queue reaches this value. More...

BlockAckType	m_blockAckType
	the BlockAck type More...

bool	m_currentIsFragmented
	flag whether current packet is fragmented More...

Time	m_currentPacketTimestamp
	the current packet timestamp More...

Time	m_failedAddBaTimeout
	timeout after failed BA agreement More...

bool	m_isAccessRequestedForRts
	flag whether access is requested to transmit a RTS frame More...

Ptr< QosBlockedDestinations >	m_qosBlockedDestinations
	the QoS blocked destinations More...

Time	m_startTxop
	the start TXOP time More...

TracedCallback< Time, Time >	m_txopTrace
	TXOP trace callback. More...

TypeOfStation	m_typeOfStation
	the type of station More...

bool	m_useExplicitBarAfterMissedBlockAck
	flag whether explicit BlockAckRequest should be sent upon missed BlockAck Response More...

Friends
class	::AmpduAggregationTest
	allow AmpduAggregationTest class access More...

class	::HeAggregationTest
	allow HeAggregationTest class access More...

class	::TwoLevelAggregationTest
	allow TwoLevelAggregationTest class access More...

class	AggregationCapableTransmissionListener
	allow AggregationCapableTransmissionListener class access More...

Additional Inherited Members
Public Types inherited from ns3::Txop
typedef Callback< void, Ptr< const Packet > >	TxDropped
	typedef for a callback to invoke when a packet is dropped. More...

typedef Callback< void, const WifiMacHeader & >	TxFailed
	typedef for a callback to invoke when a packet transmission was failed. More...

typedef Callback< void, const WifiMacHeader & >	TxOk
	typedef for a callback to invoke when a packet transmission was completed successfully. More...

Protected Member Functions inherited from ns3::Txop
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

bool	NeedDataRetransmission (Ptr< const Packet > packet, const WifiMacHeader &hdr)
	Check if Data should be re-transmitted if Ack was missed. More...

bool	NeedRtsRetransmission (Ptr< const Packet > packet, const WifiMacHeader &hdr)
	Check if RTS should be re-transmitted if CTS was missed. More...

void	NextFragment (void)
	Continue to the next fragment. More...

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

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	TxDroppedPacket (Ptr< const WifiMacQueueItem > item)
	Pass the packet included in the wifi MAC queue item to the packet dropped callback. More...

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

void	UpdateFailedCw (void)
	Update the value of the CW variable to take into account a transmission failure. 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 inherited from ns3::Txop
bool	m_accessRequested
	flag whether channel access is already requested 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...

WifiMacHeader	m_currentHdr
	the current header More...

Ptr< const Packet >	m_currentPacket
	the current packet More...

MacLowTransmissionParameters	m_currentParams
	current transmission parameters 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...

uint8_t	m_fragmentNumber
	the fragment number More...

Ptr< MacLow >	m_low
	the MacLow 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...

TxDropped	m_txDroppedCallback
	the packet dropped callback More...

TxFailed	m_txFailedCallback
	the transmit failed callback More...

Ptr< MacTxMiddle >	m_txMiddle
	the MacTxMiddle More...

TxOk	m_txOkCallback
	the transmit OK callback More...

Time	m_txopLimit
	the TXOP limit time More...

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 QoS data frames as well as MSDU aggregation (A-MSDU) and block ack sessions, for a given access class.

This class implements the packet fragmentation and retransmission policy for QoS data 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.

This queue contains packets for a particular access class. Possibles access classes are:

AC_VO : voice, TID = 6,7
AC_VI : video, TID = 4,5
AC_BE : best-effort, TID = 0,3
AC_BK : background, TID = 1,2

This class also implements block ack sessions and MSDU aggregation (A-MSDU). If A-MSDU is enabled for that access class, it picks several packets from the queue instead of a single one and sends the aggregated packet to ns3::MacLow.

The fragmentation policy currently implemented uses a simple 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::QosTxop is accessible through the following paths with Config::Set and Config::Connect:

"/NodeList/[i]/DeviceList/[i]/$ns3::WifiNetDevice/Mac/$ns3::RegularWifiMac/Txop/$ns3::QosTxop"
"/NodeList/[i]/DeviceList/[i]/$ns3::WifiNetDevice/Mac/$ns3::RegularWifiMac/VO_Txop"
"/NodeList/[i]/DeviceList/[i]/$ns3::WifiNetDevice/Mac/$ns3::RegularWifiMac/VI_Txop"
"/NodeList/[i]/DeviceList/[i]/$ns3::WifiNetDevice/Mac/$ns3::RegularWifiMac/BE_Txop"
"/NodeList/[i]/DeviceList/[i]/$ns3::WifiNetDevice/Mac/$ns3::RegularWifiMac/BK_Txop"

Attributes

UseExplicitBarAfterMissedBlockAck: Specify whether explicit BlockAckRequest should be sent upon missed BlockAck Response.
- Set with class: BooleanValue
- Underlying type: bool
- Initial value: true
- Flags: construct write read
AddBaResponseTimeout: The timeout to wait for ADDBA response after the Ack to ADDBA request is received.
- Set with class: ns3::TimeValue
- Underlying type: Time –9223372036854775808.0ns:+9223372036854775807.0ns
- Initial value: +1000000.0ns
- Flags: construct write read
FailedAddBaTimeout: The timeout after a failed BA agreement. During this timeout, the originator resumes sending packets using normal MPDU. After that, BA agreement is reset and the originator will retry BA negotiation.
- Set with class: ns3::TimeValue
- Underlying type: Time –9223372036854775808.0ns:+9223372036854775807.0ns
- Initial value: +200000000.0ns
- Flags: construct write read
BlockAckManager: The BlockAckManager object.
- Set with class: ns3::PointerValue
- Underlying type: ns3::Ptr< ns3::BlockAckManager>
- Initial value: 0
- Flags: construct write read

Attributes defined in parent class ns3::Txop

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 –9223372036854775808.0ns:+9223372036854775807.0ns
- Initial value: +0.0ns
- Flags: construct write read
Queue: The WifiMacQueue object
- Set with class: ns3::PointerValue
- Underlying type: ns3::Ptr< ns3::WifiMacQueue>
- Flags: read

TraceSources

TxopTrace: Trace source for TXOP start and duration times
Callback signature: ns3::TracedValueCallback::Time

TraceSources defined in parent class ns3::Txop

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 440 bytes (on a 64-bit architecture).

Definition at line 92 of file qos-txop.h.

Constructor & Destructor Documentation

◆ QosTxop()

ns3::QosTxop::QosTxop ( )

Definition at line 94 of file qos-txop.cc.

References BaTxFailed(), BaTxOk(), ns3::QosBlockedDestinations::Block(), m_baManager, m_blockAckType, m_qosBlockedDestinations, ns3::Txop::m_queue, ns3::MakeCallback(), NS_LOG_FUNCTION, and ns3::QosBlockedDestinations::Unblock().

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◆ ~QosTxop()

ns3::QosTxop::~QosTxop ( )

virtual

Definition at line 112 of file qos-txop.cc.

References NS_LOG_FUNCTION.

Member Function Documentation

◆ AddBaResponseTimeout()

void ns3::QosTxop::AddBaResponseTimeout	(	Mac48Address	recipient,
		uint8_t	tid
	)

private

Callback when ADDBA response is not received after timeout.

Parameters

recipient	MAC address of recipient
tid	traffic ID

Definition at line 1708 of file qos-txop.cc.

References ns3::Txop::GenerateBackoff(), m_baManager, m_failedAddBaTimeout, NS_LOG_FUNCTION, ns3::OriginatorBlockAckAgreement::PENDING, ResetBa(), RestartAccessIfNeeded(), and ns3::Simulator::Schedule().

Referenced by GotAck().

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◆ BaTxFailed()

void ns3::QosTxop::BaTxFailed ( const WifiMacHeader & hdr )

The packet we sent was successfully received by the receiver.

Parameters

hdr	the header of the packet that we failed to sent.

Definition at line 1698 of file qos-txop.cc.

References ns3::Callback< R, T1, T2, T3, T4, T5, T6, T7, T8, T9 >::IsNull(), ns3::Txop::m_currentHdr, ns3::Txop::m_txFailedCallback, and NS_LOG_FUNCTION.

Referenced by QosTxop().

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◆ BaTxOk()

void ns3::QosTxop::BaTxOk ( const WifiMacHeader & hdr )

The packet we sent was successfully received by the receiver.

Parameters

hdr	the header of the packet that we successfully sent.

Definition at line 1688 of file qos-txop.cc.

References ns3::Callback< R, T1, T2, T3, T4, T5, T6, T7, T8, T9 >::IsNull(), ns3::Txop::m_currentHdr, ns3::Txop::m_txOkCallback, and NS_LOG_FUNCTION.

Referenced by QosTxop().

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◆ CompleteConfig()

void ns3::QosTxop::CompleteConfig ( void )

Complete block ack configuration.

Definition at line 1550 of file qos-txop.cc.

References m_ac, m_baManager, ns3::Txop::m_low, ns3::Txop::m_txMiddle, ns3::MakeCallback(), NS_LOG_FUNCTION, and SendDelbaFrame().

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◆ CompleteMpduTx()

void ns3::QosTxop::CompleteMpduTx ( Ptr< WifiMacQueueItem > mpdu )

Stores an MPDU (part of an A-MPDU) in block ack agreement (i.e.

the sender is waiting for a BlockAck containing the sequence number of this MPDU).

Parameters

mpdu	received MPDU.

Definition at line 1519 of file qos-txop.cc.

References GetBaAgreementEstablished(), m_baManager, and NS_ASSERT.

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◆ DequeuePeekedFrame()

Ptr< WifiMacQueueItem > ns3::QosTxop::DequeuePeekedFrame	(	Ptr< const WifiMacQueueItem >	peekedItem,
		WifiTxVector	txVector,
		bool	aggregate = `true`,
		uint32_t	ampduSize = `0`,
		Time	ppduDurationLimit = `Time::Min ()`
	)

Dequeue the frame that has been previously peeked by calling PeekNextFrame.

If the peeked frame is a QoS Data frame, it is actually dequeued if it meets the constraint on the maximum A-MPDU size (by assuming that the frame has to be aggregated to an existing A-MPDU of the given size) and its transmission time does not exceed the given PPDU duration limit (if distinct from Time::Min ()). If the peeked frame is a unicast QoS Data frame stored in the EDCA queue, attempt to perform A-MSDU aggregation (while meeting the constraints mentioned above) if aggregate is true and assign a sequence number to the dequeued frame.

Parameters

peekedItem	the peeked frame.
txVector	the TX vector used to transmit the peeked frame
aggregate	whether to attempt A-MSDU aggregation
ampduSize	the size of the existing A-MPDU in bytes, if any
ppduDurationLimit	the limit on the PPDU duration

Returns: the dequeued frame.

Definition at line 318 of file qos-txop.cc.

References GetBaAgreementEstablished(), GetBaBufferSize(), GetBaStartingSequence(), ns3::Mac48Address::IsBroadcast(), ns3::IsInWindow(), m_baManager, ns3::Txop::m_low, m_qosBlockedDestinations, ns3::Txop::m_queue, ns3::Txop::m_txMiddle, NS_ASSERT, NS_LOG_DEBUG, NS_LOG_FUNCTION, and ns3::QosUtilsIsOldPacket().

Referenced by NotifyAccessGranted(), StartNextPacket(), and ns3::MacLow::StartTransmission().

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◆ DoDispose()

void ns3::QosTxop::DoDispose ( void )

privatevirtual

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::Txop.

Definition at line 118 of file qos-txop.cc.

References ns3::Txop::DoDispose(), m_ackPolicySelector, m_baManager, m_qosBlockedDestinations, and NS_LOG_FUNCTION.

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◆ DoInitialize()

void ns3::QosTxop::DoInitialize ( void )

privatevirtual

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::Txop.

Definition at line 1679 of file qos-txop.cc.

References ns3::Txop::GenerateBackoff(), ns3::Txop::GetCw(), ns3::Txop::m_cwTrace, NS_LOG_FUNCTION, and ns3::Txop::ResetCw().

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◆ EndTxNoAck()

void ns3::QosTxop::EndTxNoAck ( void )

virtual

Event handler when a transmission that does not require an Ack has completed.

Reimplemented from ns3::Txop.

Definition at line 1173 of file qos-txop.cc.

References ns3::Txop::m_currentPacket, NS_LOG_DEBUG, NS_LOG_FUNCTION, ns3::Txop::ResetCw(), and TerminateTxop().

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◆ GetAckPolicySelector()

Ptr< WifiAckPolicySelector > ns3::QosTxop::GetAckPolicySelector ( void ) const

Return the ack policy selector.

Returns: the ack policy selector.

Definition at line 188 of file qos-txop.cc.

References m_ackPolicySelector.

Referenced by ns3::MacLow::StartTransmission().

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◆ GetAddBaResponseTimeout()

Time ns3::QosTxop::GetAddBaResponseTimeout ( void ) const

Get the timeout for ADDBA response.

Returns: the timeout to wait for ADDBA response

Definition at line 1744 of file qos-txop.cc.

References m_addBaResponseTimeout.

Referenced by GetTypeId().

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◆ GetAmpduExist()

bool ns3::QosTxop::GetAmpduExist ( Mac48Address dest ) const

Return whether A-MPDU is used to transmit data to a peer station.

Parameters

dest	address of peer station

Returns: true if A-MPDU is used by the peer station

Definition at line 1501 of file qos-txop.cc.

References m_aMpduEnabled, and NS_LOG_FUNCTION.

Referenced by MissedAck(), MissedBlockAck(), and NeedFragmentation().

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◆ GetBaAgreementEstablished()

bool ns3::QosTxop::GetBaAgreementEstablished	(	Mac48Address	address,
		uint8_t	tid
	)		const

Parameters

address	recipient address of the peer station
tid	traffic ID.

Returns: true if a block ack agreement is established, false otherwise.

Checks if a block ack agreement is established with station addressed by recipient for TID tid.

Definition at line 128 of file qos-txop.cc.

References first::address, ns3::OriginatorBlockAckAgreement::ESTABLISHED, and m_baManager.

Referenced by CompleteMpduTx(), DequeuePeekedFrame(), GotAck(), IsQosOldPacket(), MissedAck(), NeedFragmentation(), NotifyAccessGranted(), NotifyMissedCts(), PeekNextFrame(), and ns3::ConstantWifiAckPolicySelector::UpdateTxParams().

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◆ GetBaBufferSize()

uint16_t ns3::QosTxop::GetBaBufferSize	(	Mac48Address	address,
		uint8_t	tid
	)		const

Parameters

address	recipient address of the peer station
tid	traffic ID.

Returns: the negotiated buffer size during ADDBA handshake.

Returns the negotiated buffer size during ADDBA handshake with station addressed by recipient for TID tid.

Definition at line 134 of file qos-txop.cc.

References first::address, and m_baManager.

Referenced by DequeuePeekedFrame(), GetTransmissionParameters(), PeekNextFrame(), and ns3::ConstantWifiAckPolicySelector::UpdateTxParams().

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◆ GetBaStartingSequence()

uint16_t ns3::QosTxop::GetBaStartingSequence	(	Mac48Address	address,
		uint8_t	tid
	)		const

Parameters

address	recipient address of the peer station
tid	traffic ID.

Returns: the starting sequence number of the originator transmit window.

Returns the current starting sequence number of the transmit window on the originator (WinStartO) of the block ack agreement established with the given recipient for the given TID.

Definition at line 140 of file qos-txop.cc.

References first::address, and m_baManager.

Referenced by DequeuePeekedFrame(), IsQosOldPacket(), PeekNextFrame(), and ns3::ConstantWifiAckPolicySelector::UpdateTxParams().

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◆ GetBlockAckThreshold()

uint8_t ns3::QosTxop::GetBlockAckThreshold ( void ) const

Return the current threshold for block ack mechanism.

Returns: the current threshold for block ack mechanism.

Definition at line 1574 of file qos-txop.cc.

References m_blockAckThreshold, and NS_LOG_FUNCTION.

Referenced by NotifyAccessGranted(), and SetupBlockAckIfNeeded().

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◆ GetFailedAddBaTimeout()

Time ns3::QosTxop::GetFailedAddBaTimeout ( void ) const

Get the timeout for failed BA agreement.

Returns: the timeout for failed BA agreement

Definition at line 1757 of file qos-txop.cc.

References m_failedAddBaTimeout.

Referenced by GetTypeId().

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◆ GetFragmentOffset()

uint32_t ns3::QosTxop::GetFragmentOffset ( void ) const

privatevirtual

Calculate the offset for the current fragment.

Returns: the offset for the current fragment in bytes.

Reimplemented from ns3::Txop.

Definition at line 1345 of file qos-txop.cc.

References ns3::WifiMacHeader::GetAddr1(), ns3::WifiRemoteStationManager::GetFragmentOffset(), GetTxopFragmentOffset(), IsTxopFragmentation(), ns3::Txop::m_currentHdr, ns3::Txop::m_currentPacket, ns3::Txop::m_fragmentNumber, and ns3::Txop::m_stationManager.

Referenced by GetFragmentPacket().

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◆ GetFragmentPacket()

Ptr< Packet > ns3::QosTxop::GetFragmentPacket ( WifiMacHeader * hdr )

virtual

Get the next fragment from the packet with appropriate Wifi header for the fragment.

Parameters

hdr	Wi-Fi header.

Returns: the fragment with the current fragment number.

Reimplemented from ns3::Txop.

Definition at line 1377 of file qos-txop.cc.

References ns3::Packet::CreateFragment(), GetFragmentOffset(), GetFragmentSize(), IsLastFragment(), ns3::Txop::m_currentHdr, ns3::Txop::m_currentPacket, ns3::Txop::m_fragmentNumber, NS_LOG_FUNCTION, ns3::WifiMacHeader::SetFragmentNumber(), ns3::WifiMacHeader::SetMoreFragments(), and ns3::WifiMacHeader::SetNoMoreFragments().

Referenced by NotifyAccessGranted().

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◆ GetFragmentSize()

uint32_t ns3::QosTxop::GetFragmentSize ( void ) const

privatevirtual

Calculate the size of the current fragment.

Returns: the size of the current fragment in bytes.

Reimplemented from ns3::Txop.

Definition at line 1315 of file qos-txop.cc.

References ns3::WifiMacHeader::GetAddr1(), ns3::WifiRemoteStationManager::GetFragmentSize(), GetNextTxopFragmentSize(), IsTxopFragmentation(), ns3::Txop::m_currentHdr, ns3::Txop::m_currentPacket, ns3::Txop::m_fragmentNumber, and ns3::Txop::m_stationManager.

Referenced by GetFragmentPacket().

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◆ GetNextFragmentSize()

uint32_t ns3::QosTxop::GetNextFragmentSize ( void ) const

privatevirtual

Calculate the size of the next fragment.

Returns: the size of the next fragment in bytes.

Reimplemented from ns3::Txop.

Definition at line 1330 of file qos-txop.cc.

References ns3::WifiMacHeader::GetAddr1(), ns3::WifiRemoteStationManager::GetFragmentSize(), GetNextTxopFragmentSize(), IsTxopFragmentation(), ns3::Txop::m_currentHdr, ns3::Txop::m_currentPacket, ns3::Txop::m_fragmentNumber, and ns3::Txop::m_stationManager.

Referenced by NotifyAccessGranted().

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◆ GetNextSequenceNumberFor()

uint16_t ns3::QosTxop::GetNextSequenceNumberFor ( const WifiMacHeader * hdr )

Return the next sequence number for the given header.

Parameters

hdr	Wi-Fi header.

Returns: the next sequence number.

Definition at line 215 of file qos-txop.cc.

References ns3::Txop::m_txMiddle.

◆ GetNextTxopFragmentSize()

uint32_t ns3::QosTxop::GetNextTxopFragmentSize ( uint32_t fragmentNumber ) const

private

Calculate the size of the next TXOP fragment.

Parameters

fragmentNumber number of the next fragment

Returns: the next TXOP fragment size in bytes

Definition at line 1296 of file qos-txop.cc.

References GetNTxopFragment(), ns3::Packet::GetSize(), GetTxopFragmentSize(), ns3::Txop::m_currentPacket, NS_LOG_DEBUG, and NS_LOG_FUNCTION.

Referenced by GetFragmentSize(), and GetNextFragmentSize().

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◆ GetNTxopFragment()

uint32_t ns3::QosTxop::GetNTxopFragment ( void ) const

private

Calculate the number of TXOP fragments needed for the transmission of the current packet.

Returns: the number of TXOP fragments needed for the transmission of the current packet

Definition at line 1257 of file qos-txop.cc.

References ns3::Packet::GetSize(), GetTxopFragmentSize(), ns3::Txop::m_currentPacket, and NS_LOG_DEBUG.

Referenced by GetNextTxopFragmentSize(), and IsLastFragment().

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◆ GetTransmissionParameters()

MacLowTransmissionParameters ns3::QosTxop::GetTransmissionParameters ( Ptr< const WifiMacQueueItem > frame ) const

Compute the MacLow transmission parameters for the given frame.

Allowed frames are those handled by a QosTxop (QoS data frames, BlockAckReq frames, ADDBA Request/Response, DELBA Request).

Parameters

frame the given frame

Returns: the MacLow transmission parameters.

Definition at line 419 of file qos-txop.cc.

References ns3::BASIC_BLOCK_ACK, ns3::COMPRESSED_BLOCK_ACK, ns3::MacLowTransmissionParameters::DisableAck(), ns3::MacLowTransmissionParameters::DisableNextData(), ns3::MacLowTransmissionParameters::DisableRts(), ns3::MacLowTransmissionParameters::EnableAck(), ns3::MacLowTransmissionParameters::EnableBlockAck(), ns3::MacLowTransmissionParameters::EnableRts(), ns3::EXTENDED_COMPRESSED_BLOCK_ACK, GetBaBufferSize(), ns3::CtrlBAckRequestHeader::GetTidInfo(), ns3::Mac48Address::IsBroadcast(), m_blockAckType, ns3::Txop::m_low, ns3::Txop::m_stationManager, ns3::MULTI_TID_BLOCK_ACK, ns3::WifiRemoteStationManager::NeedRts(), NS_FATAL_ERROR, and NS_LOG_FUNCTION.

Referenced by NotifyAccessGranted(), and StartNextPacket().

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◆ GetTxopFragmentOffset()

uint32_t ns3::QosTxop::GetTxopFragmentOffset ( uint32_t fragmentNumber ) const

private

Calculate the offset for the fragment.

Parameters

fragmentNumber number of the fragment

Returns: the TXOP fragment offset in bytes

Definition at line 1270 of file qos-txop.cc.

References ns3::Packet::GetSize(), GetTxopFragmentSize(), ns3::Txop::m_currentPacket, NS_ASSERT, and NS_LOG_DEBUG.

Referenced by GetFragmentOffset().

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◆ GetTxopFragmentSize()

uint32_t ns3::QosTxop::GetTxopFragmentSize ( void ) const

private

Calculate the size of the current TXOP fragment.

Returns: the size of the current TXOP fragment in bytes

Definition at line 1224 of file qos-txop.cc.

References ns3::Txop::GetLow(), ns3::Packet::GetSize(), ns3::Txop::GetTxopLimit(), ns3::Time::IsZero(), ns3::Txop::m_currentHdr, ns3::Txop::m_currentPacket, ns3::Txop::m_currentParams, and NS_ASSERT.

Referenced by GetNextTxopFragmentSize(), GetNTxopFragment(), GetTxopFragmentOffset(), and IsTxopFragmentation().

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◆ GetTxopRemaining()

Time ns3::QosTxop::GetTxopRemaining ( void ) const

virtual

Return the remaining duration in the current TXOP.

Returns: the remaining duration in the current TXOP.

Reimplemented from ns3::Txop.

Definition at line 1160 of file qos-txop.cc.

References ns3::Txop::GetTxopLimit(), ns3::Time::IsStrictlyNegative(), m_startTxop, ns3::Simulator::Now(), NS_LOG_FUNCTION, and ns3::Seconds().

Referenced by NotifyAccessGranted(), StartNextPacket(), and ns3::ConstantWifiAckPolicySelector::UpdateTxParams().

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◆ GetTypeId()

TypeId ns3::QosTxop::GetTypeId ( void )

static

Get the type ID.

Returns: the object TypeId

Definition at line 54 of file qos-txop.cc.

References GetAddBaResponseTimeout(), GetFailedAddBaTimeout(), m_baManager, m_txopTrace, m_useExplicitBarAfterMissedBlockAck, ns3::MakeBooleanAccessor(), ns3::MakeBooleanChecker(), ns3::MakePointerAccessor(), ns3::MakeTimeAccessor(), ns3::MakeTimeChecker(), ns3::MakeTraceSourceAccessor(), ns3::MilliSeconds(), SetAddBaResponseTimeout(), SetFailedAddBaTimeout(), and ns3::TypeId::SetParent().

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◆ GetTypeOfStation()

TypeOfStation ns3::QosTxop::GetTypeOfStation ( void ) const

Return type of station.

Returns: type of station.

Definition at line 201 of file qos-txop.cc.

References m_typeOfStation.

Referenced by MapDestAddressForAggregation(), and MapSrcAddressForAggregation().

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◆ GotAck()

void ns3::QosTxop::GotAck ( void )

virtual

Event handler when an Ack is received.

Reimplemented from ns3::Txop.

Definition at line 758 of file qos-txop.cc.

References AddBaResponseTimeout(), ns3::WifiActionHeader::BLOCK_ACK, ns3::WifiActionHeader::BLOCK_ACK_ADDBA_REQUEST, ns3::WifiActionHeader::BLOCK_ACK_DELBA, ns3::WifiActionHeader::ActionValue::blockAck, ns3::Packet::Copy(), ns3::WifiActionHeader::GetAction(), ns3::WifiMacHeader::GetAddr1(), GetBaAgreementEstablished(), ns3::WifiActionHeader::GetCategory(), ns3::WifiMacHeader::GetQosTid(), ns3::Packet::GetSize(), ns3::MgtAddBaRequestHeader::GetTid(), ns3::MgtDelBaHeader::GetTid(), ns3::MacLowTransmissionParameters::HasNextPacket(), ns3::WifiMacHeader::IsAction(), ns3::MgtDelBaHeader::IsByOriginator(), ns3::Callback< R, T1, T2, T3, T4, T5, T6, T7, T8, T9 >::IsNull(), ns3::WifiMacHeader::IsQosAmsdu(), ns3::WifiMacHeader::IsQosData(), m_addBaResponseTimeout, m_baManager, ns3::Txop::m_currentHdr, m_currentIsFragmented, ns3::Txop::m_currentPacket, m_currentPacketTimestamp, ns3::Txop::m_currentParams, ns3::Txop::m_low, ns3::Txop::m_txOkCallback, NS_LOG_DEBUG, NS_LOG_FUNCTION, ns3::Packet::PeekHeader(), ns3::Packet::RemoveHeader(), ns3::Txop::ResetCw(), and ns3::Simulator::Schedule().

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◆ GotAddBaResponse()

void ns3::QosTxop::GotAddBaResponse	(	const MgtAddBaResponseHeader *	respHdr,
		Mac48Address	recipient
	)

Event handler when an ADDBA response is received.

Parameters

respHdr	ADDBA response header.
recipient	address of the recipient.

Definition at line 1446 of file qos-txop.cc.

References ns3::WifiMacHeader::GetAddr1(), ns3::WifiMacHeader::GetQosTid(), ns3::MgtAddBaResponseHeader::GetStatusCode(), ns3::MgtAddBaResponseHeader::GetTid(), ns3::WifiMacHeader::IsQosData(), ns3::StatusCode::IsSuccess(), m_baManager, ns3::Txop::m_currentHdr, ns3::Txop::m_currentPacket, m_currentPacketTimestamp, NS_LOG_DEBUG, NS_LOG_FUNCTION, and RestartAccessIfNeeded().

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◆ GotBlockAck()

void ns3::QosTxop::GotBlockAck	(	const CtrlBAckResponseHeader *	blockAck,
		Mac48Address	recipient,
		double	rxSnr,
		double	dataSnr,
		WifiTxVector	dataTxVector
	)

virtual

Event handler when a BlockAck is received.

Parameters

blockAck	BlockAck header.
recipient	address of the recipient.
rxSnr	SNR of the BlockAck itself in linear scale.
dataSnr	reported data SNR from the peer in linear scale.
dataTxVector	TXVECTOR used to send the Data.

Reimplemented from ns3::Txop.

Definition at line 1488 of file qos-txop.cc.

References ns3::Callback< R, T1, T2, T3, T4, T5, T6, T7, T8, T9 >::IsNull(), m_baManager, ns3::Txop::m_currentHdr, ns3::Txop::m_currentPacket, ns3::Txop::m_txOkCallback, NS_LOG_DEBUG, NS_LOG_FUNCTION, and ns3::Txop::ResetCw().

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◆ GotDelBaFrame()

void ns3::QosTxop::GotDelBaFrame	(	const MgtDelBaHeader *	delBaHdr,
		Mac48Address	recipient
	)

Event handler when a DELBA frame is received.

Parameters

delBaHdr	DELBA header.
recipient	address of the recipient.

Definition at line 1480 of file qos-txop.cc.

References ns3::MgtDelBaHeader::GetTid(), m_baManager, NS_LOG_DEBUG, and NS_LOG_FUNCTION.

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◆ HasFramesToTransmit()

bool ns3::QosTxop::HasFramesToTransmit ( void )

virtual

Check if the Txop has frames to transmit.

Returns: true if the Txop has frames to transmit.

Reimplemented from ns3::Txop.

Definition at line 207 of file qos-txop.cc.

References m_baManager, ns3::Txop::m_currentPacket, ns3::Txop::m_queue, and NS_LOG_FUNCTION.

◆ IsLastFragment()

bool ns3::QosTxop::IsLastFragment ( void ) const

privatevirtual

Check if the current fragment is the last fragment.

Returns: true if the current fragment is the last fragment, false otherwise.

Reimplemented from ns3::Txop.

Definition at line 1361 of file qos-txop.cc.

References ns3::WifiMacHeader::GetAddr1(), GetNTxopFragment(), ns3::WifiRemoteStationManager::IsLastFragment(), IsTxopFragmentation(), ns3::Txop::m_currentHdr, ns3::Txop::m_currentPacket, ns3::Txop::m_fragmentNumber, and ns3::Txop::m_stationManager.

Referenced by GetFragmentPacket(), and NotifyAccessGranted().

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◆ IsQosOldPacket()

bool ns3::QosTxop::IsQosOldPacket ( Ptr< const WifiMacQueueItem > mpdu )

private

Check if the given MPDU is to be considered old according to the current starting sequence number of the transmit window, provided that a block ack agreement has been established with the recipient for the given TID.

Parameters

mpdu	the given MPDU

Returns: true if the MPDU is to be considered old, false otherwise

Definition at line 227 of file qos-txop.cc.

References GetBaAgreementEstablished(), GetBaStartingSequence(), NS_LOG_FUNCTION, and ns3::QosUtilsIsOldPacket().

Referenced by PeekNextFrame().

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◆ IsQosTxop()

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

virtual

Check for QoS TXOP.

Returns: true if QoS TXOP.

Reimplemented from ns3::Txop.

Definition at line 1763 of file qos-txop.cc.

◆ IsTxopFragmentation()

bool ns3::QosTxop::IsTxopFragmentation ( void ) const

private

Check if the current packet is fragmented because of an exceeded TXOP duration.

Returns: true if the current packet is fragmented because of an exceeded TXOP duration, false otherwise

Definition at line 1209 of file qos-txop.cc.

References ns3::WifiMacHeader::GetAddr1(), ns3::WifiRemoteStationManager::GetFragmentSize(), GetTxopFragmentSize(), ns3::Txop::GetTxopLimit(), ns3::Txop::m_currentHdr, ns3::Txop::m_currentPacket, ns3::Txop::m_stationManager, and ns3::WifiRemoteStationManager::NeedFragmentation().

Referenced by GetFragmentOffset(), GetFragmentSize(), GetNextFragmentSize(), and IsLastFragment().

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◆ MapDestAddressForAggregation()

Mac48Address ns3::QosTxop::MapDestAddressForAggregation ( const WifiMacHeader & hdr )

This functions are used only to correctly set destination address in A-MSDU subframes.

If aggregating STA is a non-AP STA (in an infrastructure network): DA = Address3 If aggregating STA is an AP DA = Address1

Parameters

hdr	Wi-Fi header

Returns: Mac48Address

Definition at line 1421 of file qos-txop.cc.

References ns3::ADHOC_STA, ns3::AP, ns3::WifiMacHeader::GetAddr1(), ns3::WifiMacHeader::GetAddr3(), GetTypeOfStation(), and NS_LOG_FUNCTION.

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◆ MapSrcAddressForAggregation()

Mac48Address ns3::QosTxop::MapSrcAddressForAggregation ( const WifiMacHeader & hdr )

This functions are used only to correctly set source address in A-MSDU subframes.

If aggregating STA is a non-AP STA (in an infrastructure network): SA = Address2 If aggregating STA is an AP SA = Address3

Parameters

hdr	Wi-Fi header

Returns: Mac48Address

Definition at line 1405 of file qos-txop.cc.

References ns3::ADHOC_STA, ns3::WifiMacHeader::GetAddr2(), ns3::WifiMacHeader::GetAddr3(), GetTypeOfStation(), NS_LOG_FUNCTION, and ns3::STA.

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◆ MissedAck()

void ns3::QosTxop::MissedAck ( void )

virtual

Event handler when an Ack is missed.

Reimplemented from ns3::Txop.

Definition at line 818 of file qos-txop.cc.

References ns3::WifiActionHeader::BLOCK_ACK, ns3::Txop::GenerateBackoff(), ns3::WifiMacHeader::GetAddr1(), GetAmpduExist(), GetBaAgreementEstablished(), ns3::WifiActionHeader::GetCategory(), ns3::Txop::GetCw(), ns3::WifiMacHeader::GetQosTid(), ns3::Packet::GetSize(), ns3::GetTid(), ns3::WifiMacHeader::IsAction(), ns3::Callback< R, T1, T2, T3, T4, T5, T6, T7, T8, T9 >::IsNull(), ns3::WifiMacHeader::IsQosData(), m_baManager, ns3::Txop::m_currentHdr, ns3::Txop::m_currentPacket, m_currentPacketTimestamp, ns3::Txop::m_cwTrace, m_failedAddBaTimeout, ns3::Txop::m_stationManager, ns3::Txop::m_txFailedCallback, ns3::Txop::NeedDataRetransmission(), NS_LOG_DEBUG, NS_LOG_FUNCTION, ns3::Packet::PeekHeader(), ns3::OriginatorBlockAckAgreement::PENDING, ns3::WifiRemoteStationManager::ReportDataFailed(), ns3::WifiRemoteStationManager::ReportFinalDataFailed(), ResetBa(), ns3::Txop::ResetCw(), RestartAccessIfNeeded(), ns3::Simulator::Schedule(), ns3::WifiMacHeader::SetRetry(), and ns3::Txop::UpdateFailedCw().

Referenced by AmpduAggregationTest::DoRun().

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◆ MissedBlockAck()

void ns3::QosTxop::MissedBlockAck ( uint8_t nMpdus )

virtual

Event handler when a BlockAck timeout has occurred.

Parameters

nMpdus the number of MPDUs sent in the A-MPDU transmission that results in a BlockAck timeout.

Reimplemented from ns3::Txop.

Definition at line 876 of file qos-txop.cc.

References ns3::WifiActionHeader::BLOCK_ACK, ns3::OriginatorBlockAckAgreement::ESTABLISHED, ns3::Txop::GenerateBackoff(), ns3::WifiMacHeader::GetAddr1(), GetAmpduExist(), ns3::WifiActionHeader::GetCategory(), ns3::Txop::GetCw(), ns3::Packet::GetSize(), ns3::GetTid(), ns3::WifiMacHeader::IsAction(), ns3::WifiMacHeader::IsBlockAckReq(), ns3::Callback< R, T1, T2, T3, T4, T5, T6, T7, T8, T9 >::IsNull(), m_baManager, ns3::Txop::m_currentHdr, ns3::Txop::m_currentPacket, ns3::Txop::m_cwTrace, m_failedAddBaTimeout, ns3::Txop::m_stationManager, ns3::Txop::m_txFailedCallback, m_useExplicitBarAfterMissedBlockAck, NeedBarRetransmission(), ns3::Txop::NeedDataRetransmission(), NS_LOG_DEBUG, NS_LOG_FUNCTION, ns3::Packet::PeekHeader(), ns3::OriginatorBlockAckAgreement::PENDING, PrepareBlockAckRequest(), ns3::WifiRemoteStationManager::ReportAmpduTxStatus(), ns3::WifiRemoteStationManager::ReportDataFailed(), ns3::WifiRemoteStationManager::ReportFinalDataFailed(), ResetBa(), ns3::Txop::ResetCw(), RestartAccessIfNeeded(), ns3::Simulator::Schedule(), ScheduleBar(), ns3::WifiMacHeader::SetRetry(), and ns3::Txop::UpdateFailedCw().

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◆ NeedBarRetransmission()

bool ns3::QosTxop::NeedBarRetransmission ( void )

Check if BlockAckRequest should be re-transmitted.

Returns: true if BAR should be re-transmitted, false otherwise.

Definition at line 1052 of file qos-txop.cc.

References ns3::WifiMacHeader::GetAddr1(), ns3::WifiMacHeader::GetQosTid(), ns3::CtrlBAckRequestHeader::GetTidInfo(), ns3::CtrlBAckResponseHeader::GetTidInfo(), ns3::WifiMacHeader::IsBlockAck(), ns3::WifiMacHeader::IsBlockAckReq(), ns3::WifiMacHeader::IsQosData(), m_baManager, ns3::Txop::m_currentHdr, ns3::Txop::m_currentPacket, and ns3::Packet::PeekHeader().

Referenced by MissedBlockAck().

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◆ NeedFragmentation()

bool ns3::QosTxop::NeedFragmentation ( void ) const

virtual

Check if the current packet should be fragmented.

Returns: true if the current packet should be fragmented, false otherwise

Reimplemented from ns3::Txop.

Definition at line 1183 of file qos-txop.cc.

References ns3::WifiMacHeader::GetAddr1(), GetAmpduExist(), GetBaAgreementEstablished(), ns3::WifiRemoteStationManager::GetHeSupported(), ns3::WifiRemoteStationManager::GetHtSupported(), ns3::Txop::GetLow(), ns3::Packet::GetSize(), ns3::GetTid(), ns3::Txop::GetTxopLimit(), ns3::WifiRemoteStationManager::GetVhtSupported(), ns3::WifiMacHeader::IsData(), ns3::WifiMacHeader::IsQosData(), ns3::Time::IsStrictlyPositive(), ns3::Txop::m_currentHdr, ns3::Txop::m_currentPacket, ns3::Txop::m_currentParams, ns3::Txop::m_stationManager, ns3::WifiRemoteStationManager::NeedFragmentation(), NS_LOG_FUNCTION, and ns3::WIFI_MOD_CLASS_HT.

Referenced by NotifyAccessGranted().

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◆ NotifyAccessGranted()

void ns3::QosTxop::NotifyAccessGranted ( void )

virtual

Notify the Txop that access has been granted.

Reimplemented from ns3::Txop.

Definition at line 502 of file qos-txop.cc.

References ns3::BASIC_BLOCK_ACK, ns3::Copy(), DequeuePeekedFrame(), ns3::MacLowTransmissionParameters::DisableNextData(), ns3::MacLowTransmissionParameters::DisableRts(), ns3::MacLowTransmissionParameters::EnableNextData(), ns3::WifiMacHeader::GetAddr1(), GetBaAgreementEstablished(), GetBlockAckThreshold(), GetFragmentPacket(), GetNextFragmentSize(), ns3::WifiRemoteStationManager::GetQosSupported(), ns3::WifiMacHeader::GetQosTid(), ns3::Packet::GetSize(), GetTransmissionParameters(), ns3::Txop::GetTxopLimit(), GetTxopRemaining(), ns3::Mac48Address::IsBroadcast(), ns3::WifiMacHeader::IsData(), ns3::Mac48Address::IsGroup(), IsLastFragment(), ns3::WifiMacHeader::IsQosAmsdu(), ns3::WifiMacHeader::IsQosData(), ns3::Time::IsStrictlyPositive(), ns3::Txop::m_accessRequested, m_baManager, m_blockAckType, ns3::Txop::m_currentHdr, m_currentIsFragmented, ns3::Txop::m_currentPacket, m_currentPacketTimestamp, ns3::Txop::m_currentParams, ns3::Txop::m_fragmentNumber, m_isAccessRequestedForRts, ns3::Txop::m_low, ns3::Txop::m_queue, m_startTxop, ns3::Txop::m_stationManager, ns3::Time::Min(), NeedFragmentation(), ns3::Simulator::Now(), NS_ASSERT, NS_LOG_DEBUG, NS_LOG_FUNCTION, PeekNextFrame(), ns3::OriginatorBlockAckAgreement::RESET, SetupBlockAckIfNeeded(), and ns3::WifiRemoteStationManager::UpdateFragmentationThreshold().

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◆ NotifyInternalCollision()

void ns3::QosTxop::NotifyInternalCollision ( void )

virtual

Notify the Txop that internal collision has occurred.

Reimplemented from ns3::Txop.

Definition at line 630 of file qos-txop.cc.

References ns3::Txop::GenerateBackoff(), ns3::WifiMacHeader::GetAddr1(), ns3::Mac48Address::GetBroadcast(), ns3::Packet::GetSize(), ns3::Callback< R, T1, T2, T3, T4, T5, T6, T7, T8, T9 >::IsNull(), ns3::Txop::m_currentHdr, ns3::Txop::m_currentPacket, m_isAccessRequestedForRts, ns3::Txop::m_queue, ns3::Txop::m_stationManager, ns3::Txop::m_txFailedCallback, ns3::Txop::NeedDataRetransmission(), ns3::Txop::NeedRtsRetransmission(), NS_LOG_DEBUG, NS_LOG_FUNCTION, PeekNextFrame(), ns3::WifiRemoteStationManager::ReportDataFailed(), ns3::WifiRemoteStationManager::ReportFinalDataFailed(), ns3::WifiRemoteStationManager::ReportFinalRtsFailed(), ns3::WifiRemoteStationManager::ReportRtsFailed(), ns3::Txop::ResetCw(), RestartAccessIfNeeded(), and ns3::Txop::UpdateFailedCw().

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◆ NotifyMissedCts()

void ns3::QosTxop::NotifyMissedCts ( std::list< Ptr< WifiMacQueueItem >> mpduList )

Event handler when a CTS timeout has occurred.

Parameters

mpduList the list of MPDUs that were not transmitted

Definition at line 712 of file qos-txop.cc.

References ns3::Txop::GenerateBackoff(), ns3::WifiMacHeader::GetAddr1(), GetBaAgreementEstablished(), ns3::Txop::GetCw(), ns3::Callback< R, T1, T2, T3, T4, T5, T6, T7, T8, T9 >::IsNull(), m_baManager, ns3::Txop::m_currentHdr, ns3::Txop::m_currentPacket, ns3::Txop::m_cwTrace, ns3::Txop::m_stationManager, ns3::Txop::m_txFailedCallback, ns3::Txop::NeedRtsRetransmission(), NS_ASSERT, NS_LOG_DEBUG, NS_LOG_FUNCTION, ns3::WifiRemoteStationManager::ReportFinalRtsFailed(), ns3::Txop::ResetCw(), RestartAccessIfNeeded(), and ns3::Txop::UpdateFailedCw().

Referenced by ns3::MacLow::CtsTimeout().

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◆ PeekNextFrame()

Ptr< const WifiMacQueueItem > ns3::QosTxop::PeekNextFrame	(	uint8_t	tid = `8`,
		Mac48Address	recipient = `Mac48Address::GetBroadcast ()`
	)

Peek the next frame to transmit to the given receiver and of the given TID from the block ack manager retransmit queue first and, if not found, from the EDCA queue.

If tid is equal to 8 (invalid value) and recipient is the broadcast address, the first available frame is returned. Note that A-MSDU aggregation is never attempted (this is relevant if the frame is peeked from the EDCA queue). If the frame is peeked from the EDCA queue, it is assigned a sequence number peeked from MacTxMiddle.

Parameters

tid	traffic ID.
recipient	the receiver station address.

Returns: the peeked frame.

Definition at line 253 of file qos-txop.cc.

References ns3::WifiMacQueue::EMPTY, GetBaAgreementEstablished(), GetBaBufferSize(), GetBaStartingSequence(), ns3::IsInWindow(), IsQosOldPacket(), m_baManager, m_qosBlockedDestinations, ns3::Txop::m_queue, ns3::Txop::m_txMiddle, NS_LOG_DEBUG, NS_LOG_FUNCTION, ns3::WifiMacHeader::SetFragmentNumber(), ns3::WifiMacHeader::SetNoMoreFragments(), ns3::WifiMacHeader::SetNoRetry(), and ns3::WifiMacHeader::SetSequenceNumber().

Referenced by NotifyAccessGranted(), NotifyInternalCollision(), RestartAccessIfNeeded(), StartAccessIfNeeded(), StartNextPacket(), ns3::MacLow::StartTransmission(), and ns3::ConstantWifiAckPolicySelector::UpdateTxParams().

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◆ PeekNextSequenceNumberFor()

uint16_t ns3::QosTxop::PeekNextSequenceNumberFor ( const WifiMacHeader * hdr )

Return the next sequence number for the Traffic ID and destination, but do not pick it (i.e.

the current sequence number remains unchanged).

Parameters

hdr	Wi-Fi header.

Returns: the next sequence number.

Definition at line 221 of file qos-txop.cc.

References ns3::Txop::m_txMiddle.

◆ PrepareBlockAckRequest()

Ptr< const WifiMacQueueItem > ns3::QosTxop::PrepareBlockAckRequest	(	Mac48Address	recipient,
		uint8_t	tid
	)		const

Parameters

address	recipient address
tid	traffic ID

Prepare a BlockAckRequest to be sent to recipient for Traffic ID tid. The header for the BlockAckRequest is requested to the QosTxop corresponding to the given TID. A block ack agreement with the given recipient for the given TID must have been established by such QosTxop.

Definition at line 146 of file qos-txop.cc.

References ns3::Packet::AddHeader(), ns3::Txop::m_low, NS_LOG_FUNCTION, ns3::WifiMacHeader::SetAddr1(), ns3::WifiMacHeader::SetAddr2(), ns3::WifiMacHeader::SetDsNotFrom(), ns3::WifiMacHeader::SetDsNotTo(), ns3::WifiMacHeader::SetNoMoreFragments(), ns3::WifiMacHeader::SetNoRetry(), ns3::WifiMacHeader::SetType(), and ns3::WIFI_MAC_CTL_BACKREQ.

Referenced by MissedBlockAck(), ns3::MacLow::SendDataAfterCts(), and ns3::MacLow::SendDataPacket().

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◆ PushFront()

void ns3::QosTxop::PushFront	(	Ptr< const Packet >	packet,
		const WifiMacHeader &	hdr
	)

Parameters

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

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

Definition at line 1437 of file qos-txop.cc.

References ns3::Txop::m_queue, NS_LOG_FUNCTION, and StartAccessIfNeeded().

Referenced by SendDelbaFrame().

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◆ ResetBa()

void ns3::QosTxop::ResetBa	(	Mac48Address	recipient,
		uint8_t	tid
	)

private

Reset BA agreement after BA negotiation failed.

Parameters

recipient	MAC address of recipient
tid	traffic ID

Definition at line 1722 of file qos-txop.cc.

References ns3::OriginatorBlockAckAgreement::ESTABLISHED, m_baManager, and NS_LOG_FUNCTION.

Referenced by AddBaResponseTimeout(), MissedAck(), and MissedBlockAck().

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◆ RestartAccessIfNeeded()

void ns3::QosTxop::RestartAccessIfNeeded ( void )

virtual

Restart access request if needed.

Reimplemented from ns3::Txop.

Definition at line 987 of file qos-txop.cc.

References ns3::Txop::IsAccessRequested(), m_baManager, ns3::Txop::m_channelAccessManager, ns3::Txop::m_currentHdr, ns3::Txop::m_currentPacket, m_isAccessRequestedForRts, ns3::Txop::m_queue, ns3::Txop::m_stationManager, ns3::WifiRemoteStationManager::NeedRts(), NS_LOG_FUNCTION, PeekNextFrame(), and ns3::ChannelAccessManager::RequestAccess().

Referenced by AddBaResponseTimeout(), GotAddBaResponse(), MissedAck(), MissedBlockAck(), NotifyInternalCollision(), NotifyMissedCts(), and TerminateTxop().

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◆ ScheduleBar()

void ns3::QosTxop::ScheduleBar	(	Ptr< const WifiMacQueueItem >	bar,
		bool	skipIfNoDataQueued = `false`
	)

Parameters

bar	the BlockAckRequest to schedule
skipIfNoDataQueued	do not send if there is no data queued

Request the block ack manager to schedule the transmission of the given BlockAckRequest.

Definition at line 167 of file qos-txop.cc.

References m_baManager.

Referenced by MissedBlockAck(), ns3::MacLow::SendDataAfterCts(), and ns3::MacLow::SendDataPacket().

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◆ SendAddBaRequest()

void ns3::QosTxop::SendAddBaRequest	(	Mac48Address	recipient,
		uint8_t	tid,
		uint16_t	startSeq,
		uint16_t	timeout,
		bool	immediateBAck
	)

private

Sends an ADDBA Request to establish a block ack agreement with STA addressed by recipient for TID tid.

Parameters

recipient	address of the recipient.
tid	traffic ID.
startSeq	starting sequence.
timeout	timeout value.
immediateBAck	flag to indicate whether immediate BlockAck is used.

Definition at line 1581 of file qos-txop.cc.

Referenced by SetupBlockAckIfNeeded().

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◆ SendDelbaFrame()

void ns3::QosTxop::SendDelbaFrame	(	Mac48Address	addr,
		uint8_t	tid,
		bool	byOriginator
	)

Sends DELBA frame to cancel a block ack agreement with STA addressed by addr for TID tid.

Parameters

addr	address of the recipient.
tid	traffic ID.
byOriginator	flag to indicate whether this is set by the originator.

Definition at line 1642 of file qos-txop.cc.

References ns3::Packet::AddHeader(), ns3::WifiActionHeader::BLOCK_ACK, ns3::WifiActionHeader::BLOCK_ACK_DELBA, ns3::WifiActionHeader::ActionValue::blockAck, m_baManager, ns3::Txop::m_low, NS_LOG_FUNCTION, PushFront(), ns3::WifiActionHeader::SetAction(), ns3::WifiMacHeader::SetAddr1(), ns3::WifiMacHeader::SetAddr2(), ns3::WifiMacHeader::SetAddr3(), ns3::MgtDelBaHeader::SetByOriginator(), ns3::MgtDelBaHeader::SetByRecipient(), ns3::WifiMacHeader::SetDsNotFrom(), ns3::WifiMacHeader::SetDsNotTo(), ns3::MgtDelBaHeader::SetTid(), ns3::WifiMacHeader::SetType(), and ns3::WIFI_MAC_MGT_ACTION.

Referenced by CompleteConfig(), ns3::MacLow::CreateBlockAckAgreement(), and ns3::MacLow::ResetBlockAckInactivityTimerIfNeeded().

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◆ SetAccessCategory()

void ns3::QosTxop::SetAccessCategory ( AcIndex ac )

Set the access category of this EDCAF.

Parameters

ac	access category.

Definition at line 1398 of file qos-txop.cc.

References m_ac, and NS_LOG_FUNCTION.

◆ SetAckPolicySelector()

void ns3::QosTxop::SetAckPolicySelector ( Ptr< WifiAckPolicySelector > ackSelector )

Set the ack policy selector.

Parameters

ackSelector the ack policy selector.

Definition at line 181 of file qos-txop.cc.

References m_ackPolicySelector, and NS_LOG_FUNCTION.

◆ SetAddBaResponseTimeout()

void ns3::QosTxop::SetAddBaResponseTimeout ( Time addBaResponseTimeout )

Set the timeout to wait for ADDBA response.

Parameters

addBaResponseTimeout the timeout to wait for ADDBA response

Definition at line 1737 of file qos-txop.cc.

References m_addBaResponseTimeout, and NS_LOG_FUNCTION.

Referenced by GetTypeId().

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◆ SetAmpduExist()

void ns3::QosTxop::SetAmpduExist	(	Mac48Address	dest,
		bool	enableAmpdu
	)

Set indication whether A-MPDU is used to transmit data to a peer station.

Parameters

dest	address of peer station.
enableAmpdu	flag whether A-MPDU is used or not.

Definition at line 1512 of file qos-txop.cc.

References m_aMpduEnabled, and NS_LOG_FUNCTION.

Referenced by ns3::MacLow::StartTransmission().

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◆ SetBlockAckInactivityTimeout()

void ns3::QosTxop::SetBlockAckInactivityTimeout ( uint16_t timeout )

Set the BlockAck inactivity timeout.

Parameters

timeout the BlockAck inactivity timeout.

Definition at line 1567 of file qos-txop.cc.

References m_blockAckInactivityTimeout, NS_LOG_FUNCTION, and timeout.

Referenced by ns3::RegularWifiMac::SetBeBlockAckInactivityTimeout(), ns3::RegularWifiMac::SetBkBlockAckInactivityTimeout(), ns3::RegularWifiMac::SetViBlockAckInactivityTimeout(), and ns3::RegularWifiMac::SetVoBlockAckInactivityTimeout().

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◆ SetBlockAckThreshold()

void ns3::QosTxop::SetBlockAckThreshold ( uint8_t threshold )

Set threshold for block ack mechanism.

If number of packets in the queue reaches the threshold, block ack mechanism is used.

Parameters

threshold block ack threshold value.

Definition at line 1559 of file qos-txop.cc.

References m_baManager, m_blockAckThreshold, and NS_LOG_FUNCTION.

Referenced by ns3::RegularWifiMac::SetBeBlockAckThreshold(), ns3::RegularWifiMac::SetBkBlockAckThreshold(), ns3::RegularWifiMac::SetViBlockAckThreshold(), and ns3::RegularWifiMac::SetVoBlockAckThreshold().

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◆ SetFailedAddBaTimeout()

void ns3::QosTxop::SetFailedAddBaTimeout ( Time failedAddBaTimeout )

Set the timeout for failed BA agreement.

During the timeout period, all packets will be transmitted using normal MPDU.

Parameters

failedAddBaTimeout the timeout for failed BA agreement

Definition at line 1750 of file qos-txop.cc.

References m_failedAddBaTimeout, and NS_LOG_FUNCTION.

Referenced by GetTypeId().

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◆ SetTypeOfStation()

void ns3::QosTxop::SetTypeOfStation ( TypeOfStation type )

Set type of station with the given type.

Parameters

type	the type of station.

Definition at line 194 of file qos-txop.cc.

References m_typeOfStation, and NS_LOG_FUNCTION.

◆ SetupBlockAckIfNeeded()

bool ns3::QosTxop::SetupBlockAckIfNeeded ( void )

private

If number of packets in the queue reaches m_blockAckThreshold value, an ADDBA Request frame is sent to destination in order to setup a block ack.

Returns: true if we tried to set up block ack, false otherwise.

Definition at line 1530 of file qos-txop.cc.

References ns3::WifiMacHeader::GetAddr1(), GetBlockAckThreshold(), ns3::WifiRemoteStationManager::GetHeSupported(), ns3::Txop::GetLow(), ns3::WifiMacHeader::GetQosTid(), ns3::WifiRemoteStationManager::GetVhtSupported(), m_blockAckInactivityTimeout, ns3::Txop::m_currentHdr, ns3::Txop::m_queue, ns3::Txop::m_stationManager, ns3::Txop::m_txMiddle, NS_LOG_FUNCTION, SendAddBaRequest(), and ns3::WIFI_MOD_CLASS_HT.

Referenced by NotifyAccessGranted(), and StartNextPacket().

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◆ SetWifiRemoteStationManager()

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

virtual

Set WifiRemoteStationsManager this Txop is associated to.

Parameters

remoteManager WifiRemoteStationManager to associate.

Reimplemented from ns3::Txop.

Definition at line 173 of file qos-txop.cc.

References m_baManager, ns3::Txop::m_stationManager, NS_LOG_FUNCTION, and ns3::Txop::SetWifiRemoteStationManager().

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◆ StartAccessIfNeeded()

void ns3::QosTxop::StartAccessIfNeeded ( void )

virtual

Request access from Txop if needed.

Reimplemented from ns3::Txop.

Definition at line 1023 of file qos-txop.cc.

References ns3::Txop::IsAccessRequested(), m_baManager, ns3::Txop::m_channelAccessManager, ns3::Txop::m_currentPacket, m_isAccessRequestedForRts, ns3::Txop::m_queue, ns3::Txop::m_stationManager, ns3::WifiRemoteStationManager::NeedRts(), NS_LOG_FUNCTION, PeekNextFrame(), and ns3::ChannelAccessManager::RequestAccess().

Referenced by PushFront().

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◆ StartNextPacket()

void ns3::QosTxop::StartNextPacket ( void )

virtual

Start transmission for the next packet if allowed by the TxopLimit.

Reimplemented from ns3::Txop.

Definition at line 1075 of file qos-txop.cc.

References ns3::Copy(), DequeuePeekedFrame(), ns3::WifiMacHeader::GetAddr1(), ns3::Txop::GetLow(), ns3::WifiRemoteStationManager::GetQosSupported(), ns3::WifiMacHeader::GetQosTid(), GetTransmissionParameters(), ns3::Txop::GetTxopLimit(), GetTxopRemaining(), ns3::Mac48Address::IsBroadcast(), ns3::WifiMacHeader::IsQosData(), m_baManager, ns3::Txop::m_currentHdr, ns3::Txop::m_currentPacket, m_currentPacketTimestamp, ns3::Txop::m_currentParams, ns3::Txop::m_fragmentNumber, ns3::Txop::m_low, ns3::Txop::m_stationManager, NS_ASSERT, NS_LOG_DEBUG, NS_LOG_FUNCTION, PeekNextFrame(), ns3::OriginatorBlockAckAgreement::RESET, SetupBlockAckIfNeeded(), TerminateTxop(), and ns3::WifiRemoteStationManager::UpdateFragmentationThreshold().

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◆ TerminateTxop()

void ns3::QosTxop::TerminateTxop ( void )

privatevirtual

Update backoff and restart access if needed.

Reimplemented from ns3::Txop.

Definition at line 1147 of file qos-txop.cc.

References ns3::Txop::GenerateBackoff(), ns3::Txop::GetTxopLimit(), m_startTxop, m_txopTrace, ns3::Simulator::Now(), NS_LOG_DEBUG, NS_LOG_FUNCTION, and RestartAccessIfNeeded().

Referenced by EndTxNoAck(), and StartNextPacket().

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◆ UpdateCurrentPacket()

void ns3::QosTxop::UpdateCurrentPacket ( Ptr< WifiMacQueueItem > mpdu )

Update the current packet this QosTxop is trying to transmit.

This method is typically called by MacLow when it changes (i.e., by performing A-MSDU aggregation) the packet received from this QosTxop.

Parameters

mpdu	the MPDU that MacLow is forwarding down to the PHY.

Definition at line 493 of file qos-txop.cc.

References ns3::Txop::m_currentHdr, ns3::Txop::m_currentPacket, m_currentPacketTimestamp, and NS_LOG_FUNCTION.

Referenced by ns3::MacLow::StartTransmission().

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Friends And Related Function Documentation

◆ ::AmpduAggregationTest

friend class ::AmpduAggregationTest

friend

allow AmpduAggregationTest class access

Definition at line 96 of file qos-txop.h.

◆ ::HeAggregationTest

friend class ::HeAggregationTest

friend

allow HeAggregationTest class access

Definition at line 100 of file qos-txop.h.

◆ ::TwoLevelAggregationTest

friend class ::TwoLevelAggregationTest

friend

allow TwoLevelAggregationTest class access

Definition at line 98 of file qos-txop.h.

◆ AggregationCapableTransmissionListener

friend class AggregationCapableTransmissionListener

friend

allow AggregationCapableTransmissionListener class access

Definition at line 443 of file qos-txop.h.

Member Data Documentation

◆ m_ac

AcIndex ns3::QosTxop::m_ac

private

the access category

Definition at line 531 of file qos-txop.h.

Referenced by CompleteConfig(), and SetAccessCategory().

◆ m_ackPolicySelector

Ptr<WifiAckPolicySelector> ns3::QosTxop::m_ackPolicySelector

private

the ack policy selector

Definition at line 533 of file qos-txop.h.

Referenced by DoDispose(), GetAckPolicySelector(), and SetAckPolicySelector().

◆ m_addBaResponseTimeout

Time ns3::QosTxop::m_addBaResponseTimeout

private

timeout for ADDBA response

Definition at line 545 of file qos-txop.h.

Referenced by GetAddBaResponseTimeout(), GotAck(), and SetAddBaResponseTimeout().

◆ m_aMpduEnabled

std::map<Mac48Address, bool> ns3::QosTxop::m_aMpduEnabled

list containing flags whether A-MPDU is enabled for a given destination address

Definition at line 102 of file qos-txop.h.

Referenced by GetAmpduExist(), and SetAmpduExist().

◆ m_baManager

Ptr<BlockAckManager> ns3::QosTxop::m_baManager

private

◆ m_blockAckInactivityTimeout

uint16_t ns3::QosTxop::m_blockAckInactivityTimeout

private

the BlockAck inactivity timeout value (in TUs, i.e.

blocks of 1024 microseconds)

Definition at line 541 of file qos-txop.h.

Referenced by SetBlockAckInactivityTimeout(), and SetupBlockAckIfNeeded().

◆ m_blockAckThreshold

uint8_t ns3::QosTxop::m_blockAckThreshold

private

the block ack threshold (use BA mechanism if number of packets in queue reaches this value.

If this value is 0, block ack is never used. When A-MPDU is enabled, block ack mechanism is used regardless of this value)

Definition at line 536 of file qos-txop.h.

Referenced by GetBlockAckThreshold(), and SetBlockAckThreshold().

◆ m_blockAckType

BlockAckType ns3::QosTxop::m_blockAckType

private

the BlockAck type

Definition at line 539 of file qos-txop.h.

Referenced by GetTransmissionParameters(), NotifyAccessGranted(), and QosTxop().

◆ m_currentIsFragmented

bool ns3::QosTxop::m_currentIsFragmented

private

flag whether current packet is fragmented

Definition at line 544 of file qos-txop.h.

Referenced by GotAck(), and NotifyAccessGranted().

◆ m_currentPacketTimestamp

Time ns3::QosTxop::m_currentPacketTimestamp

private

the current packet timestamp

Definition at line 540 of file qos-txop.h.

Referenced by GotAck(), GotAddBaResponse(), MissedAck(), NotifyAccessGranted(), StartNextPacket(), and UpdateCurrentPacket().

◆ m_failedAddBaTimeout

Time ns3::QosTxop::m_failedAddBaTimeout

private

timeout after failed BA agreement

Definition at line 546 of file qos-txop.h.

Referenced by AddBaResponseTimeout(), GetFailedAddBaTimeout(), MissedAck(), MissedBlockAck(), and SetFailedAddBaTimeout().

◆ m_isAccessRequestedForRts

bool ns3::QosTxop::m_isAccessRequestedForRts

private

flag whether access is requested to transmit a RTS frame

Definition at line 543 of file qos-txop.h.

Referenced by NotifyAccessGranted(), NotifyInternalCollision(), RestartAccessIfNeeded(), and StartAccessIfNeeded().

◆ m_qosBlockedDestinations

Ptr<QosBlockedDestinations> ns3::QosTxop::m_qosBlockedDestinations

private

the QoS blocked destinations

Definition at line 534 of file qos-txop.h.

Referenced by DequeuePeekedFrame(), DoDispose(), PeekNextFrame(), and QosTxop().

◆ m_startTxop

Time ns3::QosTxop::m_startTxop

private

the start TXOP time

Definition at line 542 of file qos-txop.h.

Referenced by GetTxopRemaining(), NotifyAccessGranted(), and TerminateTxop().

◆ m_txopTrace

TracedCallback<Time, Time> ns3::QosTxop::m_txopTrace

private

TXOP trace callback.

Definition at line 549 of file qos-txop.h.

Referenced by GetTypeId(), and TerminateTxop().

◆ m_typeOfStation

TypeOfStation ns3::QosTxop::m_typeOfStation

private

the type of station

Definition at line 532 of file qos-txop.h.

Referenced by GetTypeOfStation(), and SetTypeOfStation().

◆ m_useExplicitBarAfterMissedBlockAck

bool ns3::QosTxop::m_useExplicitBarAfterMissedBlockAck

private

flag whether explicit BlockAckRequest should be sent upon missed BlockAck Response

Definition at line 547 of file qos-txop.h.

Referenced by GetTypeId(), and MissedBlockAck().

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

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

Public Member Functions

Static Public Member Functions

Public Attributes

Private Member Functions

Private Attributes

Friends

Additional Inherited Members

Detailed Description

Config Paths

Attributes

Attributes defined in parent class ns3::Txop

TraceSources

TraceSources defined in parent class ns3::Txop

Constructor & Destructor Documentation

◆ QosTxop()

◆ ~QosTxop()

Member Function Documentation

◆ AddBaResponseTimeout()

◆ BaTxFailed()

◆ BaTxOk()

◆ CompleteConfig()

◆ CompleteMpduTx()

◆ DequeuePeekedFrame()

◆ DoDispose()

◆ DoInitialize()

◆ EndTxNoAck()

◆ GetAckPolicySelector()

◆ GetAddBaResponseTimeout()

◆ GetAmpduExist()

◆ GetBaAgreementEstablished()

◆ GetBaBufferSize()

◆ GetBaStartingSequence()

◆ GetBlockAckThreshold()

◆ GetFailedAddBaTimeout()

◆ GetFragmentOffset()

◆ GetFragmentPacket()

◆ GetFragmentSize()

◆ GetNextFragmentSize()

◆ GetNextSequenceNumberFor()

◆ GetNextTxopFragmentSize()

◆ GetNTxopFragment()

◆ GetTransmissionParameters()

◆ GetTxopFragmentOffset()

◆ GetTxopFragmentSize()

◆ GetTxopRemaining()

◆ GetTypeId()

◆ GetTypeOfStation()

◆ GotAck()

◆ GotAddBaResponse()

◆ GotBlockAck()

◆ GotDelBaFrame()

◆ HasFramesToTransmit()

◆ IsLastFragment()

◆ IsQosOldPacket()

◆ IsQosTxop()

◆ IsTxopFragmentation()

◆ MapDestAddressForAggregation()

◆ MapSrcAddressForAggregation()

◆ MissedAck()

◆ MissedBlockAck()

◆ NeedBarRetransmission()

◆ NeedFragmentation()

◆ NotifyAccessGranted()

◆ NotifyInternalCollision()

◆ NotifyMissedCts()

◆ PeekNextFrame()

◆ PeekNextSequenceNumberFor()

◆ PrepareBlockAckRequest()

◆ PushFront()

◆ ResetBa()

◆ RestartAccessIfNeeded()

◆ ScheduleBar()

◆ SendAddBaRequest()

◆ SendDelbaFrame()

◆ SetAccessCategory()

◆ SetAckPolicySelector()

◆ SetAddBaResponseTimeout()

◆ SetAmpduExist()

◆ SetBlockAckInactivityTimeout()

◆ SetBlockAckThreshold()