handle packet fragmentation and retransmissions. More...

#include "dca-txop.h"

Inheritance diagram for ns3::DcaTxop:

Collaboration diagram for ns3::DcaTxop:

Public Types
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...

Public Member Functions
	DcaTxop ()

virtual	~DcaTxop ()

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...

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

uint32_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 DcaTxop. 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...

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

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

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

virtual void	GotBlockAck (const CtrlBAckResponseHeader *blockAck, Mac48Address recipient, double rxSnr, WifiMode txMode, double dataSnr)
	Event handler when a Block ACK is received. More...

virtual bool	HasTxop (void) const
	Check if the station has TXOP granted for the next MPDU. More...

virtual bool	IsEdca ()
	Check for EDCA. More...

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

virtual void	MissedBlockAck (uint8_t nMpdus)
	Event handler when a Block ACK timeout has occurred. 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	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< const Packet > packet, const WifiMacHeader &hdr)

void	SetAifsn (uint32_t aifsn)
	Set the number of slots that make up an AIFS. More...

void	SetLow (const Ptr< MacLow > low)
	Set MacLow associated with this DcaTxop. More...

void	SetManager (const Ptr< DcfManager > manager)
	Set DcfManager this DcaTxop is associated to. 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 DcaTxop is associated to. More...

void	SetTxOkCallback (TxOk callback)

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

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

virtual void	StartNextFragment (void)
	Start transmission for the next fragment. More...

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

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

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

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

	SimpleRefCount (const SimpleRefCount &o)
	Copy constructor. More...

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

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

void	Ref (void) const
	Increment the reference count. More...

void	Unref (void) const
	Decrement the reference count. More...

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

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

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

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

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

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

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

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

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

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

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

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

Protected Member Functions
virtual void	DoDispose (void)
	Destructor implementation. More...

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

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

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

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

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

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

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

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

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

virtual bool	NeedsAccess (void) const
	Check if the DCF requires access. More...

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

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

virtual void	NotifyCollision (void)
	Notify the DCF that collision has occurred. More...

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

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

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

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

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

MacLowTransmissionParameters	m_currentParams
	current transmission parameters More...

Ptr< DcfState >	m_dcf
	the DCF state More...

uint8_t	m_fragmentNumber
	the fragment number More...

Ptr< MacLow >	m_low
	the MacLow More...

Ptr< DcfManager >	m_manager
	the DCF manager 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...

Friends
class	DcfListener
	allow DcfListener class access More...

class	DcfState
	< DcfState associated class More...

class	MacLowTransmissionListener
	allow MacLowTransmissionListener class access More...

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

Detailed Description

handle packet fragmentation and retransmissions.

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

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

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

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

Config Paths

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

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

Attributes

MinCw: The minimum value of the contention window.
- Set with class: ns3::UintegerValue
- Underlying type: uint32_t 0:4294967295
- Initial value: 15
- Flags: construct write read
MaxCw: The maximum value of the contention window.
- Set with class: ns3::UintegerValue
- Underlying type: uint32_t 0:4294967295
- Initial value: 1023
- Flags: construct write read
Aifsn: The AIFSN: the default value conforms to simple DCA.
- Set with class: ns3::UintegerValue
- Underlying type: uint32_t 0:4294967295
- Initial value: 2
- Flags: construct write read
TxopLimit: The TXOP limit: the default value conforms to simple DCA.
- 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

No TraceSources are defined for this type.
Size of this type is 208 bytes (on a 64-bit architecture).

Definition at line 58 of file dca-txop.h.

Member Typedef Documentation

typedef Callback<void, Ptr<const Packet> > ns3::DcaTxop::TxDropped

typedef for a callback to invoke when a packet is dropped.

Definition at line 89 of file dca-txop.h.

typedef Callback<void, const WifiMacHeader&> ns3::DcaTxop::TxFailed

typedef for a callback to invoke when a packet transmission was failed.

Definition at line 84 of file dca-txop.h.

typedef Callback<void, const WifiMacHeader&> ns3::DcaTxop::TxOk

typedef for a callback to invoke when a packet transmission was completed successfully.

Definition at line 79 of file dca-txop.h.

Constructor & Destructor Documentation

ns3::DcaTxop::DcaTxop ( )

Definition at line 73 of file dca-txop.cc.

References m_dcf, m_queue, m_rng, and NS_LOG_FUNCTION.

ns3::DcaTxop::~DcaTxop ( )

virtual

Definition at line 83 of file dca-txop.cc.

References NS_LOG_FUNCTION.

Member Function Documentation

int64_t ns3::DcaTxop::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 228 of file dca-txop.cc.

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

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

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void ns3::DcaTxop::Cancel ( void )

virtual

Cancel the transmission.

Definition at line 571 of file dca-txop.cc.

References NS_LOG_DEBUG, and NS_LOG_FUNCTION.

void ns3::DcaTxop::DoDispose ( void )

protectedvirtual

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 overriden 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.

Reimplemented in ns3::EdcaTxopN, and DcaTxopTest.

Definition at line 89 of file dca-txop.cc.

References m_dcf, m_low, m_queue, m_rng, m_stationManager, m_txMiddle, and NS_LOG_FUNCTION.

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

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void ns3::DcaTxop::DoInitialize ( void )

protectedvirtual

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.

Reimplemented in ns3::EdcaTxopN.

Definition at line 267 of file dca-txop.cc.

References ns3::DcfState::GetCw(), ns3::RandomVariableStream::GetInteger(), m_dcf, m_rng, NS_LOG_FUNCTION, ns3::DcfState::ResetCw(), and ns3::DcfState::StartBackoffNow().

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void ns3::DcaTxop::EndTxNoAck ( void )

virtual

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

Reimplemented in ns3::EdcaTxopN.

Definition at line 578 of file dca-txop.cc.

References ns3::DcfState::GetCw(), ns3::RandomVariableStream::GetInteger(), m_currentPacket, m_dcf, m_rng, NS_LOG_DEBUG, NS_LOG_FUNCTION, ns3::DcfState::ResetCw(), StartAccessIfNeeded(), and ns3::DcfState::StartBackoffNow().

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

Return the number of slots that make up an AIFS.

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

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

References ns3::DcfState::GetAifsn(), and m_dcf.

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

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

protectedvirtual

Calculate the offset for the current fragment.

Returns: the offset for the current fragment.

Reimplemented in ns3::EdcaTxopN.

Definition at line 328 of file dca-txop.cc.

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

Referenced by GetFragmentPacket().

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

protectedvirtual

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 in ns3::EdcaTxopN.

Definition at line 336 of file dca-txop.cc.

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

Referenced by NotifyAccessGranted(), and StartNextFragment().

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

protectedvirtual

Calculate the size of the current fragment.

Returns: the size of the current fragment.

Reimplemented in ns3::EdcaTxopN.

Definition at line 304 of file dca-txop.cc.

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

Referenced by GetFragmentPacket().

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Ptr< MacLow > ns3::DcaTxop::GetLow ( void ) const

Return the MacLow associated with this DcaTxop.

Returns: MacLow

Definition at line 260 of file dca-txop.cc.

References m_low, and NS_LOG_FUNCTION.

Referenced by ns3::EdcaTxopN::GetTxopFragmentSize(), ns3::EdcaTxopN::HasTxop(), ns3::EdcaTxopN::NeedFragmentation(), NotifyAccessGranted(), StartNextFragment(), and ns3::EdcaTxopN::StartNextPacket().

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

Return the maximum contention window size.

Returns: the maximum contention window size.

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

References ns3::DcfState::GetCwMax(), and m_dcf.

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

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

Return the minimum contention window size.

Returns: the minimum contention window size.

Definition at line 195 of file dca-txop.cc.

References ns3::DcfState::GetCwMin(), and m_dcf.

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

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

protectedvirtual

Calculate the size of the next fragment.

Returns: the size of the next fragment.

Reimplemented in ns3::EdcaTxopN.

Definition at line 320 of file dca-txop.cc.

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

Referenced by NotifyAccessGranted(), and StartNextFragment().

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Ptr< WifiMacQueue > ns3::DcaTxop::GetQueue ( void ) const

Return the packet queue associated with this DcaTxop.

Returns: WifiMacQueue

Definition at line 160 of file dca-txop.cc.

References m_queue, and NS_LOG_FUNCTION.

Referenced by AmpduAggregationTest::DoRun(), TwoLevelAggregationTest::DoRun(), and GetTypeId().

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

Return the TXOP limit.

Returns: the TXOP limit.

Definition at line 213 of file dca-txop.cc.

References ns3::DcfState::GetTxopLimit(), and m_dcf.

Referenced by ns3::EdcaTxopN::EndTxNoAck(), ns3::ApWifiMac::GetEdcaParameterSet(), ns3::EdcaTxopN::GetTxopFragmentSize(), ns3::EdcaTxopN::GetTxopRemaining(), GetTypeId(), ns3::EdcaTxopN::GotAck(), ns3::EdcaTxopN::GotBlockAck(), ns3::EdcaTxopN::HasTxop(), ns3::EdcaTxopN::IsTxopFragmentation(), ns3::EdcaTxopN::NeedFragmentation(), and ns3::EdcaTxopN::StartNextPacket().

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TypeId ns3::DcaTxop::GetTypeId ( void )

static

Get the type ID.

Returns: the object TypeId

Definition at line 39 of file dca-txop.cc.

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

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void ns3::DcaTxop::GotAck ( void )

virtual

Event handler when an ACK is received.

Reimplemented in ns3::EdcaTxopN.

Definition at line 494 of file dca-txop.cc.

References ns3::DcfState::GetCw(), ns3::RandomVariableStream::GetInteger(), ns3::Packet::GetSize(), IsLastFragment(), ns3::Callback< R, T1, T2, T3, T4, T5, T6, T7, T8, T9 >::IsNull(), m_currentHdr, m_currentPacket, m_dcf, m_rng, m_txOkCallback, NeedFragmentation(), NS_LOG_DEBUG, NS_LOG_FUNCTION, ns3::DcfState::ResetCw(), RestartAccessIfNeeded(), and ns3::DcfState::StartBackoffNow().

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void ns3::DcaTxop::GotBlockAck	(	const CtrlBAckResponseHeader *	blockAck,
		Mac48Address	recipient,
		double	rxSnr,
		WifiMode	txMode,
		double	dataSnr
	)

virtual

Event handler when a Block ACK is received.

Parameters

blockAck	block ack.
recipient	address of the recipient.
rxSnr	SNR of the block ack itself.
txMode	wifi mode.
dataSnr	reported data SNR from the peer.

Reimplemented in ns3::EdcaTxopN.

Definition at line 601 of file dca-txop.cc.

References NS_LOG_WARN.

bool ns3::DcaTxop::HasTxop ( void ) const

virtual

Check if the station has TXOP granted for the next MPDU.

Returns: true if the station has TXOP granted for the next MPDU, false otherwise

Reimplemented in ns3::EdcaTxopN.

Definition at line 613 of file dca-txop.cc.

bool ns3::DcaTxop::IsEdca ( )

virtual

Check for EDCA.

Returns: true if EDCA.

Reimplemented in ns3::EdcaTxopN.

Definition at line 589 of file dca-txop.cc.

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

protectedvirtual

Check if the current fragment is the last fragment.

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

Reimplemented in ns3::EdcaTxopN.

Definition at line 312 of file dca-txop.cc.

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

Referenced by GetFragmentPacket(), GotAck(), NotifyAccessGranted(), and StartNextFragment().

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void ns3::DcaTxop::MissedAck ( void )

virtual

Event handler when an ACK is missed.

Reimplemented in ns3::EdcaTxopN.

Definition at line 521 of file dca-txop.cc.

References ns3::WifiMacHeader::GetAddr1(), ns3::DcfState::GetCw(), ns3::RandomVariableStream::GetInteger(), ns3::Callback< R, T1, T2, T3, T4, T5, T6, T7, T8, T9 >::IsNull(), m_currentHdr, m_currentPacket, m_dcf, m_rng, m_stationManager, m_txFailedCallback, NeedDataRetransmission(), NS_LOG_DEBUG, NS_LOG_FUNCTION, ns3::WifiRemoteStationManager::ReportFinalDataFailed(), ns3::DcfState::ResetCw(), RestartAccessIfNeeded(), ns3::WifiMacHeader::SetRetry(), ns3::DcfState::StartBackoffNow(), and ns3::DcfState::UpdateFailedCw().

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

virtual

Event handler when a Block ACK timeout has occurred.

Parameters

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

Reimplemented in ns3::EdcaTxopN.

Definition at line 607 of file dca-txop.cc.

References NS_LOG_WARN.

void ns3::DcaTxop::MissedCts ( void )

virtual

Event handler when a CTS timeout has occurred.

Reimplemented in ns3::EdcaTxopN.

Definition at line 469 of file dca-txop.cc.

References ns3::WifiMacHeader::GetAddr1(), ns3::DcfState::GetCw(), ns3::RandomVariableStream::GetInteger(), ns3::Callback< R, T1, T2, T3, T4, T5, T6, T7, T8, T9 >::IsNull(), m_currentHdr, m_currentPacket, m_dcf, m_rng, m_stationManager, m_txFailedCallback, NeedRtsRetransmission(), NS_LOG_DEBUG, NS_LOG_FUNCTION, ns3::WifiRemoteStationManager::ReportFinalRtsFailed(), ns3::DcfState::ResetCw(), RestartAccessIfNeeded(), ns3::DcfState::StartBackoffNow(), and ns3::DcfState::UpdateFailedCw().

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bool ns3::DcaTxop::NeedDataRetransmission	(	Ptr< const Packet >	packet,
		const WifiMacHeader &	hdr
	)

protected

Check if DATA should be re-transmitted if ACK was missed.

Parameters

packet	current packet being transmitted.
hdr	current header being transmitted.

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

Definition at line 282 of file dca-txop.cc.

References ns3::WifiMacHeader::GetAddr1(), m_stationManager, ns3::WifiRemoteStationManager::NeedDataRetransmission(), and NS_LOG_FUNCTION.

Referenced by ns3::EdcaTxopN::MissedAck(), MissedAck(), and ns3::EdcaTxopN::NotifyInternalCollision().

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

protectedvirtual

Check if the current packet should be fragmented.

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

Reimplemented in ns3::EdcaTxopN.

Definition at line 289 of file dca-txop.cc.

References ns3::WifiMacHeader::GetAddr1(), m_currentHdr, m_currentPacket, m_stationManager, ns3::WifiRemoteStationManager::NeedFragmentation(), and NS_LOG_FUNCTION.

Referenced by GotAck(), and NotifyAccessGranted().

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bool ns3::DcaTxop::NeedRtsRetransmission	(	Ptr< const Packet >	packet,
		const WifiMacHeader &	hdr
	)

protected

Check if RTS should be re-transmitted if CTS was missed.

Parameters

packet	current packet being transmitted.
hdr	current header being transmitted.

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

Definition at line 275 of file dca-txop.cc.

References ns3::WifiMacHeader::GetAddr1(), m_stationManager, ns3::WifiRemoteStationManager::NeedRtsRetransmission(), and NS_LOG_FUNCTION.

Referenced by ns3::EdcaTxopN::MissedCts(), MissedCts(), and ns3::EdcaTxopN::NotifyInternalCollision().

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bool ns3::DcaTxop::NeedsAccess ( void ) const

protectedvirtual

Check if the DCF requires access.

Returns: true if the DCF requires access, false otherwise

Reimplemented in ns3::EdcaTxopN.

Definition at line 357 of file dca-txop.cc.

References m_currentPacket, m_queue, and NS_LOG_FUNCTION.

void ns3::DcaTxop::NextFragment ( void )

protected

Continue to the next fragment.

This method simply increments the internal variable that keep track of the current fragment number.

Definition at line 297 of file dca-txop.cc.

References m_fragmentNumber, and NS_LOG_FUNCTION.

Referenced by StartNextFragment().

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void ns3::DcaTxop::NotifyAccessGranted ( void )

protectedvirtual

Notify the DCF that access has been granted.

Reimplemented in ns3::EdcaTxopN, and DcaTxopTest.

Definition at line 364 of file dca-txop.cc.

References ns3::MacLowTransmissionParameters::DisableAck(), ns3::MacLowTransmissionParameters::DisableNextData(), ns3::MacLowTransmissionParameters::DisableOverrideDurationId(), ns3::MacLowTransmissionParameters::DisableRts(), ns3::MacLowTransmissionParameters::EnableAck(), ns3::MacLowTransmissionParameters::EnableNextData(), ns3::WifiMacHeader::GetAddr1(), GetFragmentPacket(), GetLow(), GetNextFragmentSize(), ns3::MacTxMiddle::GetNextSequenceNumberFor(), ns3::WifiMacHeader::GetSequenceControl(), ns3::Packet::GetSize(), ns3::Mac48Address::IsGroup(), IsLastFragment(), m_currentHdr, m_currentPacket, m_currentParams, m_fragmentNumber, m_queue, m_stationManager, m_txMiddle, NeedFragmentation(), NS_ASSERT, NS_LOG_DEBUG, NS_LOG_FUNCTION, ns3::WifiMacHeader::SetFragmentNumber(), ns3::WifiMacHeader::SetNoMoreFragments(), ns3::WifiMacHeader::SetNoRetry(), ns3::WifiMacHeader::SetSequenceNumber(), ns3::MacLow::StartTransmission(), and ns3::WifiRemoteStationManager::UpdateFragmentationThreshold().

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void ns3::DcaTxop::NotifyChannelSwitching ( void )

virtual

When a channel switching occurs, enqueued packets are removed.

Reimplemented in DcaTxopTest.

Definition at line 443 of file dca-txop.cc.

References m_currentPacket, m_queue, and NS_LOG_FUNCTION.

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

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void ns3::DcaTxop::NotifyCollision ( void )

protectedvirtual

Notify the DCF that collision has occurred.

Reimplemented in ns3::EdcaTxopN, and DcaTxopTest.

Definition at line 435 of file dca-txop.cc.

References ns3::DcfState::GetCw(), ns3::RandomVariableStream::GetInteger(), m_dcf, m_rng, NS_LOG_FUNCTION, RestartAccessIfNeeded(), and ns3::DcfState::StartBackoffNow().

Referenced by NotifyInternalCollision().

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void ns3::DcaTxop::NotifyInternalCollision ( void )

protectedvirtual

Notify the DCF that internal collision has occurred.

Reimplemented in ns3::EdcaTxopN, and DcaTxopTest.

Definition at line 428 of file dca-txop.cc.

References NotifyCollision(), and NS_LOG_FUNCTION.

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void ns3::DcaTxop::NotifySleep ( void )

virtual

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

Reimplemented in DcaTxopTest.

Definition at line 451 of file dca-txop.cc.

References m_currentHdr, m_currentPacket, m_queue, and NS_LOG_FUNCTION.

void ns3::DcaTxop::NotifyWakeUp ( void )

virtual

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

Reimplemented in DcaTxopTest.

Definition at line 462 of file dca-txop.cc.

References NS_LOG_FUNCTION, and RestartAccessIfNeeded().

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void ns3::DcaTxop::Queue	(	Ptr< const 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 219 of file dca-txop.cc.

References ns3::WifiMacHeader::GetAddr1(), m_queue, m_stationManager, NS_LOG_FUNCTION, ns3::WifiRemoteStationManager::PrepareForQueue(), and StartAccessIfNeeded().

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void ns3::DcaTxop::RestartAccessIfNeeded ( void )

protectedvirtual

Restart access request if needed.

Reimplemented in ns3::EdcaTxopN.

Definition at line 236 of file dca-txop.cc.

References ns3::DcfState::IsAccessRequested(), m_currentPacket, m_dcf, m_manager, m_queue, NS_LOG_FUNCTION, and ns3::DcfManager::RequestAccess().

Referenced by GotAck(), MissedAck(), MissedCts(), NotifyCollision(), and NotifyWakeUp().

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void ns3::DcaTxop::SetAifsn ( uint32_t aifsn )

Set the number of slots that make up an AIFS.

Parameters

aifsn the number of slots that make up an AIFS.

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

References m_dcf, NS_LOG_FUNCTION, and ns3::DcfState::SetAifsn().

Referenced by GetTypeId(), and ns3::StaWifiMac::SetEdcaParameters().

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void ns3::DcaTxop::SetLow ( const Ptr< MacLow > low )

Set MacLow associated with this DcaTxop.

Parameters

low MacLow.

Definition at line 115 of file dca-txop.cc.

References m_low, and NS_LOG_FUNCTION.

Referenced by AmpduAggregationTest::DoRun(), TwoLevelAggregationTest::DoRun(), and ns3::RegularWifiMac::SetupEdcaQueue().

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void ns3::DcaTxop::SetManager ( const Ptr< DcfManager > manager )

Set DcfManager this DcaTxop is associated to.

Parameters

manager DcfManager.

Definition at line 101 of file dca-txop.cc.

References ns3::DcfManager::Add(), m_dcf, m_manager, and NS_LOG_FUNCTION.

Referenced by AmpduAggregationTest::DoRun().

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

Set the maximum contention window size.

Parameters

maxCw the maximum contention window size.

Definition at line 174 of file dca-txop.cc.

References m_dcf, NS_LOG_FUNCTION, and ns3::DcfState::SetCwMax().

Referenced by GetTypeId(), and ns3::StaWifiMac::SetEdcaParameters().

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

Set the minimum contention window size.

Parameters

minCw the minimum contention window size.

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

References m_dcf, NS_LOG_FUNCTION, and ns3::DcfState::SetCwMin().

Referenced by GetTypeId(), and ns3::StaWifiMac::SetEdcaParameters().

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void ns3::DcaTxop::SetTxDroppedCallback ( TxDropped callback )

Parameters

callback the callback to invoke when a packet is dropped.

Definition at line 143 of file dca-txop.cc.

References m_queue, m_txDroppedCallback, ns3::MakeCallback(), NS_LOG_FUNCTION, and TxDroppedPacket().

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void ns3::DcaTxop::SetTxFailedCallback ( TxFailed callback )

Parameters

callback the callback to invoke when a packet transmission was completed unsuccessfully.

Definition at line 136 of file dca-txop.cc.

References m_txFailedCallback, and NS_LOG_FUNCTION.

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

Set MacTxMiddle this DcaTxop is associated to.

Parameters

txMiddle MacTxMiddle.

Definition at line 108 of file dca-txop.cc.

References m_txMiddle, and NS_LOG_FUNCTION.

Referenced by AmpduAggregationTest::DoRun().

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void ns3::DcaTxop::SetTxOkCallback ( TxOk callback )

Parameters

callback the callback to invoke when a packet transmission was completed successfully.

Definition at line 129 of file dca-txop.cc.

References m_txOkCallback, and NS_LOG_FUNCTION.

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

Set the TXOP limit.

Parameters

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

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

References m_dcf, NS_LOG_FUNCTION, and ns3::DcfState::SetTxopLimit().

Referenced by GetTypeId(), Experiment::Run(), and ns3::StaWifiMac::SetEdcaParameters().

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

virtual

Set WifiRemoteStationsManager this DcaTxop is associated to.

Parameters

remoteManager WifiRemoteStationManager.

Reimplemented in ns3::EdcaTxopN.

Definition at line 122 of file dca-txop.cc.

References m_stationManager, and NS_LOG_FUNCTION.

Referenced by ns3::EdcaTxopN::SetWifiRemoteStationManager().

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void ns3::DcaTxop::StartAccessIfNeeded ( void )

protectedvirtual

Request access from DCF manager if needed.

Reimplemented in ns3::EdcaTxopN.

Definition at line 248 of file dca-txop.cc.

References ns3::DcfState::IsAccessRequested(), m_currentPacket, m_dcf, m_manager, m_queue, NS_LOG_FUNCTION, and ns3::DcfManager::RequestAccess().

Referenced by EndTxNoAck(), and Queue().

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void ns3::DcaTxop::StartNextFragment ( void )

virtual

Start transmission for the next fragment.

This is called for fragment only.

Definition at line 548 of file dca-txop.cc.

References ns3::MacLowTransmissionParameters::DisableNextData(), ns3::MacLowTransmissionParameters::DisableOverrideDurationId(), ns3::MacLowTransmissionParameters::DisableRts(), ns3::MacLowTransmissionParameters::EnableAck(), ns3::MacLowTransmissionParameters::EnableNextData(), GetFragmentPacket(), GetLow(), GetNextFragmentSize(), IsLastFragment(), m_currentParams, NextFragment(), NS_LOG_DEBUG, NS_LOG_FUNCTION, and ns3::MacLow::StartTransmission().

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void ns3::DcaTxop::StartNextPacket ( void )

virtual

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

Reimplemented in ns3::EdcaTxopN.

Definition at line 595 of file dca-txop.cc.

References NS_LOG_WARN.

void ns3::DcaTxop::TxDroppedPacket ( Ptr< const WifiMacQueueItem > item )

protected

Pass the packet included in the wifi MAC queue item to the packet dropped callback.

Parameters

item	the wifi MAC queue item.

Definition at line 151 of file dca-txop.cc.

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

Referenced by SetTxDroppedCallback().

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Friends And Related Function Documentation

friend class DcfListener

friend

allow DcfListener class access

Definition at line 62 of file dca-txop.h.

friend class DcfState

friend

< DcfState associated class

Definition at line 297 of file dca-txop.h.

friend class MacLowTransmissionListener

friend

allow MacLowTransmissionListener class access

Definition at line 64 of file dca-txop.h.

Member Data Documentation

WifiMacHeader ns3::DcaTxop::m_currentHdr

protected

the current header

Definition at line 420 of file dca-txop.h.

Ptr<const Packet> ns3::DcaTxop::m_currentPacket

protected

the current packet

Definition at line 419 of file dca-txop.h.

MacLowTransmissionParameters ns3::DcaTxop::m_currentParams

protected

current transmission parameters

Definition at line 421 of file dca-txop.h.

Referenced by ns3::EdcaTxopN::GetTxopFragmentSize(), ns3::EdcaTxopN::GotAck(), ns3::EdcaTxopN::HasTxop(), ns3::EdcaTxopN::NeedFragmentation(), ns3::EdcaTxopN::NotifyAccessGranted(), NotifyAccessGranted(), ns3::EdcaTxopN::SendAddBaRequest(), ns3::EdcaTxopN::SendBlockAckRequest(), StartNextFragment(), and ns3::EdcaTxopN::StartNextPacket().

Ptr<DcfState> ns3::DcaTxop::m_dcf

protected

uint8_t ns3::DcaTxop::m_fragmentNumber

protected

the fragment number

Definition at line 422 of file dca-txop.h.

Referenced by GetFragmentOffset(), ns3::EdcaTxopN::GetFragmentOffset(), ns3::EdcaTxopN::GetFragmentPacket(), GetFragmentPacket(), GetFragmentSize(), ns3::EdcaTxopN::GetFragmentSize(), GetNextFragmentSize(), ns3::EdcaTxopN::GetNextFragmentSize(), ns3::EdcaTxopN::GotAck(), IsLastFragment(), ns3::EdcaTxopN::IsLastFragment(), NextFragment(), ns3::EdcaTxopN::NotifyAccessGranted(), NotifyAccessGranted(), and ns3::EdcaTxopN::StartNextPacket().

Ptr<MacLow> ns3::DcaTxop::m_low

protected

the MacLow

Definition at line 415 of file dca-txop.h.

Referenced by ns3::EdcaTxopN::CompleteConfig(), DoDispose(), GetLow(), ns3::EdcaTxopN::GotAck(), ns3::EdcaTxopN::MissedAck(), ns3::EdcaTxopN::MissedBlockAck(), ns3::EdcaTxopN::MissedCts(), ns3::EdcaTxopN::NotifyAccessGranted(), ns3::EdcaTxopN::RestartAccessIfNeeded(), ns3::EdcaTxopN::SendAddBaRequest(), ns3::EdcaTxopN::SendBlockAckRequest(), ns3::EdcaTxopN::SendDelbaFrame(), SetLow(), and ns3::EdcaTxopN::StartAccessIfNeeded().

Ptr<DcfManager> ns3::DcaTxop::m_manager

protected

the DCF manager

Definition at line 409 of file dca-txop.h.

Referenced by ns3::EdcaTxopN::RestartAccessIfNeeded(), RestartAccessIfNeeded(), SetManager(), ns3::EdcaTxopN::StartAccessIfNeeded(), and StartAccessIfNeeded().

Ptr<WifiMacQueue> ns3::DcaTxop::m_queue

protected

Ptr<UniformRandomVariable> ns3::DcaTxop::m_rng

protected

the random stream

Definition at line 417 of file dca-txop.h.

Referenced by AssignStreams(), DcaTxop(), DoDispose(), DoInitialize(), ns3::EdcaTxopN::DoInitialize(), ns3::EdcaTxopN::EndTxNoAck(), EndTxNoAck(), ns3::EdcaTxopN::GotAck(), GotAck(), ns3::EdcaTxopN::GotBlockAck(), ns3::EdcaTxopN::MissedAck(), MissedAck(), ns3::EdcaTxopN::MissedBlockAck(), ns3::EdcaTxopN::MissedCts(), MissedCts(), ns3::EdcaTxopN::NotifyCollision(), NotifyCollision(), and ns3::EdcaTxopN::NotifyInternalCollision().

Ptr<WifiRemoteStationManager> ns3::DcaTxop::m_stationManager

protected

the wifi remote station manager

Definition at line 416 of file dca-txop.h.

TxDropped ns3::DcaTxop::m_txDroppedCallback

protected

the packet dropped callback

Definition at line 412 of file dca-txop.h.

Referenced by SetTxDroppedCallback(), and TxDroppedPacket().

TxFailed ns3::DcaTxop::m_txFailedCallback

protected

the transmit failed callback

Definition at line 411 of file dca-txop.h.

Referenced by ns3::EdcaTxopN::BaTxFailed(), ns3::EdcaTxopN::MissedAck(), MissedAck(), ns3::EdcaTxopN::MissedCts(), MissedCts(), ns3::EdcaTxopN::NotifyInternalCollision(), and SetTxFailedCallback().

Ptr<MacTxMiddle> ns3::DcaTxop::m_txMiddle

protected

the MacTxMiddle

Definition at line 414 of file dca-txop.h.

Referenced by ns3::EdcaTxopN::CompleteConfig(), ns3::EdcaTxopN::CompleteMpduTx(), ns3::EdcaTxopN::CompleteTx(), DoDispose(), ns3::EdcaTxopN::GetNextSequenceNumberFor(), ns3::EdcaTxopN::MissedAck(), ns3::EdcaTxopN::MissedCts(), ns3::EdcaTxopN::NotifyAccessGranted(), NotifyAccessGranted(), ns3::EdcaTxopN::PeekNextSequenceNumberFor(), ns3::EdcaTxopN::SendAddBaRequest(), SetTxMiddle(), ns3::EdcaTxopN::SetupBlockAckIfNeeded(), and ns3::EdcaTxopN::StartNextPacket().

TxOk ns3::DcaTxop::m_txOkCallback

protected

the transmit OK callback

Definition at line 410 of file dca-txop.h.

Referenced by ns3::EdcaTxopN::BaTxOk(), ns3::EdcaTxopN::GotAck(), GotAck(), ns3::EdcaTxopN::GotBlockAck(), and SetTxOkCallback().

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

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

Public Types

Public Member Functions

Static Public Member Functions

Protected Member Functions

Protected Attributes

Friends

Additional Inherited Members

Detailed Description

Config Paths

Attributes

Member Typedef Documentation

Constructor & Destructor Documentation

Member Function Documentation

Friends And Related Function Documentation

Member Data Documentation