an implementation of the AARF-CD algorithmThis algorithm was first described in "Efficient Collision Detection for Auto Rate Fallback Algorithm". The implementation available here was done by Federico Maguolo for a very early development version of ns-3. Federico died before merging this work in ns-3 itself so his code was ported to ns-3 later without his supervision. More...

#include <aarfcd-wifi-manager.h>

Inheritance diagram for ns3::AarfcdWifiManager:

Collaboration diagram for ns3::AarfcdWifiManager:

Public Member Functions
	AarfcdWifiManager ()
virtual	~AarfcdWifiManager ()
Public Member Functions inherited from ns3::WifiRemoteStationManager
	WifiRemoteStationManager ()
virtual	~WifiRemoteStationManager ()
void	AddBasicMode (WifiMode mode)
void	AddSupportedMode (Mac48Address address, WifiMode mode)
WifiMode	GetAckMode (Mac48Address address, WifiMode dataMode)
WifiMode	GetBasicMode (uint32_t i) const
WifiMode	GetCtsMode (Mac48Address address, WifiMode rtsMode)
WifiMode	GetDataMode (Mac48Address address, const WifiMacHeader *header, Ptr< const Packet > packet, uint32_t fullPacketSize)
WifiMode	GetDefaultMode (void) const
uint32_t	GetFragmentationThreshold (void) const
uint32_t	GetFragmentOffset (Mac48Address address, const WifiMacHeader *header, Ptr< const Packet > packet, uint32_t fragmentNumber)
uint32_t	GetFragmentSize (Mac48Address address, const WifiMacHeader *header, Ptr< const Packet > packet, uint32_t fragmentNumber)
WifiRemoteStationInfo	GetInfo (Mac48Address address)
uint32_t	GetMaxSlrc (void) const
uint32_t	GetMaxSsrc (void) const
uint32_t	GetNBasicModes (void) const
WifiMode	GetNonUnicastMode (void) const
uint32_t	GetRtsCtsThreshold (void) const
WifiMode	GetRtsMode (Mac48Address address, const WifiMacHeader *header, Ptr< const Packet > packet)
bool	IsAssociated (Mac48Address address) const
bool	IsBrandNew (Mac48Address address) const
bool	IsLastFragment (Mac48Address address, const WifiMacHeader *header, Ptr< const Packet > packet, uint32_t fragmentNumber)
bool	IsWaitAssocTxOk (Mac48Address address) const
bool	NeedDataRetransmission (Mac48Address address, const WifiMacHeader *header, Ptr< const Packet > packet)
bool	NeedFragmentation (Mac48Address address, const WifiMacHeader *header, Ptr< const Packet > packet)
bool	NeedRts (Mac48Address address, const WifiMacHeader *header, Ptr< const Packet > packet)
bool	NeedRtsRetransmission (Mac48Address address, const WifiMacHeader *header, Ptr< const Packet > packet)
void	PrepareForQueue (Mac48Address address, const WifiMacHeader *header, Ptr< const Packet > packet, uint32_t fullPacketSize)
void	RecordDisassociated (Mac48Address address)
void	RecordGotAssocTxFailed (Mac48Address address)
void	RecordGotAssocTxOk (Mac48Address address)
void	RecordWaitAssocTxOk (Mac48Address address)
void	ReportDataFailed (Mac48Address address, const WifiMacHeader *header)
void	ReportDataOk (Mac48Address address, const WifiMacHeader *header, double ackSnr, WifiMode ackMode, double dataSnr)
void	ReportFinalDataFailed (Mac48Address address, const WifiMacHeader *header)
void	ReportFinalRtsFailed (Mac48Address address, const WifiMacHeader *header)
void	ReportRtsFailed (Mac48Address address, const WifiMacHeader *header)
void	ReportRtsOk (Mac48Address address, const WifiMacHeader *header, double ctsSnr, WifiMode ctsMode, double rtsSnr)
void	ReportRxOk (Mac48Address address, const WifiMacHeader *header, double rxSnr, WifiMode txMode)
void	Reset (void)
void	Reset (Mac48Address address)
void	SetFragmentationThreshold (uint32_t threshold)
void	SetMaxSlrc (uint32_t maxSlrc)
void	SetMaxSsrc (uint32_t maxSsrc)
void	SetRtsCtsThreshold (uint32_t threshold)
virtual void	SetupPhy (Ptr< WifiPhy > phy)
Public Member Functions inherited from ns3::Object
	Object ()
virtual	~Object ()
void	AggregateObject (Ptr< Object > other)
void	Dispose (void)
AggregateIterator	GetAggregateIterator (void) const
virtual TypeId	GetInstanceTypeId (void) const
template<typename T >
Ptr< T >	GetObject (void) const
template<typename T >
Ptr< T >	GetObject (TypeId tid) const
void	Initialize (void)
Public Member Functions inherited from ns3::SimpleRefCount< Object, ObjectBase, ObjectDeleter >
	SimpleRefCount ()
	SimpleRefCount (const SimpleRefCount &o)
uint32_t	GetReferenceCount (void) const
SimpleRefCount &	operator= (const SimpleRefCount &o)
void	Ref (void) const
void	Unref (void) const
Public Member Functions inherited from ns3::ObjectBase
virtual	~ObjectBase ()
void	GetAttribute (std::string name, AttributeValue &value) const
bool	GetAttributeFailSafe (std::string name, AttributeValue &attribute) const
void	SetAttribute (std::string name, const AttributeValue &value)
bool	SetAttributeFailSafe (std::string name, const AttributeValue &value)
bool	TraceConnect (std::string name, std::string context, const CallbackBase &cb)
bool	TraceConnectWithoutContext (std::string name, const CallbackBase &cb)
bool	TraceDisconnect (std::string name, std::string context, const CallbackBase &cb)
bool	TraceDisconnectWithoutContext (std::string name, const CallbackBase &cb)

Static Public Member Functions
static TypeId	GetTypeId (void)

Private Member Functions
void	CheckRts (AarfcdWifiRemoteStation *station)
virtual WifiRemoteStation *	DoCreateStation (void) const
virtual WifiMode	DoGetDataMode (WifiRemoteStation *station, uint32_t size)
virtual WifiMode	DoGetRtsMode (WifiRemoteStation *station)
virtual bool	DoNeedRts (WifiRemoteStation *station, Ptr< const Packet > packet, bool normally)
virtual void	DoReportDataFailed (WifiRemoteStation *station)
virtual void	DoReportDataOk (WifiRemoteStation *station, double ackSnr, WifiMode ackMode, double dataSnr)
virtual void	DoReportFinalDataFailed (WifiRemoteStation *station)
virtual void	DoReportFinalRtsFailed (WifiRemoteStation *station)
virtual void	DoReportRtsFailed (WifiRemoteStation *station)
virtual void	DoReportRtsOk (WifiRemoteStation *station, double ctsSnr, WifiMode ctsMode, double rtsSnr)
virtual void	DoReportRxOk (WifiRemoteStation *station, double rxSnr, WifiMode txMode)
void	IncreaseRtsWnd (AarfcdWifiRemoteStation *station)
virtual bool	IsLowLatency (void) const
void	ResetRtsWnd (AarfcdWifiRemoteStation *station)
void	TurnOffRts (AarfcdWifiRemoteStation *station)
void	TurnOnRts (AarfcdWifiRemoteStation *station)

Private Attributes
uint32_t	m_maxRtsWnd
uint32_t	m_maxSuccessThreshold
uint32_t	m_minRtsWnd
uint32_t	m_minSuccessThreshold
uint32_t	m_minTimerThreshold
bool	m_rtsFailsAsDataFails
double	m_successK
double	m_timerK
bool	m_turnOffRtsAfterRateDecrease
bool	m_turnOnRtsAfterRateIncrease

Additional Inherited Members
Protected Member Functions inherited from ns3::WifiRemoteStationManager
virtual void	DoDispose (void)
uint32_t	GetNSupported (const WifiRemoteStation *station) const
WifiMode	GetSupported (const WifiRemoteStation *station, uint32_t i) const

Detailed Description

an implementation of the AARF-CD algorithm

This algorithm was first described in "Efficient Collision Detection for Auto Rate Fallback Algorithm". The implementation available here was done by Federico Maguolo for a very early development version of ns-3. Federico died before merging this work in ns-3 itself so his code was ported to ns-3 later without his supervision.

Config Paths

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

/NodeList/[i]/DeviceList/[i]/$ns3::WifiNetDevice/RemoteStationManager/$ns3::AarfcdWifiManager

Attributes

SuccessK: Multiplication factor for the success threshold in the AARF algorithm.
- Set with class: ns3::DoubleValue
- Underlying type: double -1.79769e+308:1.79769e+308
- Initial value: 2
- Flags: construct write read
TimerK: Multiplication factor for the timer threshold in the AARF algorithm.
- Set with class: ns3::DoubleValue
- Underlying type: double -1.79769e+308:1.79769e+308
- Initial value: 2
- Flags: construct write read
MaxSuccessThreshold: Maximum value of the success threshold in the AARF algorithm.
- Set with class: ns3::UintegerValue
- Underlying type: uint32_t 0:4294967295
- Initial value: 60
- Flags: construct write read
MinTimerThreshold: The minimum value for the 'timer' threshold in the AARF algorithm.
- Set with class: ns3::UintegerValue
- Underlying type: uint32_t 0:4294967295
- Initial value: 15
- Flags: construct write read
MinSuccessThreshold: The minimum value for the success threshold in the AARF algorithm.
- Set with class: ns3::UintegerValue
- Underlying type: uint32_t 0:4294967295
- Initial value: 10
- Flags: construct write read
MinRtsWnd: Minimum value for Rts window of Aarf-CD
- Set with class: ns3::UintegerValue
- Underlying type: uint32_t 0:4294967295
- Initial value: 1
- Flags: construct write read
MaxRtsWnd: Maximum value for Rts window of Aarf-CD
- Set with class: ns3::UintegerValue
- Underlying type: uint32_t 0:4294967295
- Initial value: 40
- Flags: construct write read
TurnOffRtsAfterRateDecrease: If true the RTS mechanism will be turned off when the rate will be decreased
- Set with class: BooleanValue
- Underlying type: bool
- Initial value: true
- Flags: construct write read
TurnOnRtsAfterRateIncrease: If true the RTS mechanism will be turned on when the rate will be increased
- Set with class: BooleanValue
- Underlying type: bool
- Initial value: true
- Flags: construct write read

Attributes defined in parent class ns3::WifiRemoteStationManager

IsLowLatency: If true, we attempt to modelize a so-called low-latency device: a device where decisions about tx parameters can be made on a per-packet basis and feedback about the transmission of each packet is obtained before sending the next. Otherwise, we modelize a high-latency device, that is a device where we cannot update our decision about tx parameters after every packet transmission.
- Set with class: BooleanValue
- Underlying type: bool
- Flags: read
MaxSsrc: The maximum number of retransmission attempts for an RTS. This value will not have any effect on some rate control algorithms.
- Set with class: ns3::UintegerValue
- Underlying type: uint32_t 0:4294967295
- Initial value: 7
- Flags: construct write read
MaxSlrc: The maximum number of retransmission attempts for a DATA packet. This value will not have any effect on some rate control algorithms.
- Set with class: ns3::UintegerValue
- Underlying type: uint32_t 0:4294967295
- Initial value: 7
- Flags: construct write read
RtsCtsThreshold: If the size of the data packet + LLC header + MAC header + FCS trailer is bigger than this value, we use an RTS/CTS handshake before sending the data, as per IEEE Std. 802.11-2007, Section 9.2.6. This value will not have any effect on some rate control algorithms.
- Set with class: ns3::UintegerValue
- Underlying type: uint32_t 0:4294967295
- Initial value: 2346
- Flags: construct write read
FragmentationThreshold: If the size of the data packet + LLC header + MAC header + FCS trailer is biggerthan this value, we fragment it such that the size of the fragments are equal or smaller than this value, as per IEEE Std. 802.11-2007, Section 9.4. This value will not have any effect on some rate control algorithms.
- Set with class: ns3::UintegerValue
- Underlying type: uint32_t 0:4294967295
- Initial value: 2346
- Flags: construct write read
NonUnicastMode: Wifi mode used for non-unicast transmissions.
- Set with class: WifiModeValue
- Underlying type: WifiMode
- Initial value: Invalid-WifiMode
- Flags: construct write read

No TraceSources are defined for this type.

TraceSources defined in parent class ns3::WifiRemoteStationManager

MacTxRtsFailed: The transmission of a RTS by the MAC layer has failed
MacTxDataFailed: The transmission of a data packet by the MAC layer has failed
MacTxFinalRtsFailed: The transmission of a RTS has exceeded the maximum number of attempts
MacTxFinalDataFailed: The transmission of a data packet has exceeded the maximum number of attempts

Definition at line 38 of file aarfcd-wifi-manager.h.

Constructor & Destructor Documentation

ns3::AarfcdWifiManager::AarfcdWifiManager ( )

Definition at line 111 of file aarfcd-wifi-manager.cc.

References NS_LOG_FUNCTION.

ns3::AarfcdWifiManager::~AarfcdWifiManager ( )

virtual

Definition at line 116 of file aarfcd-wifi-manager.cc.

References NS_LOG_FUNCTION.

Member Function Documentation

void ns3::AarfcdWifiManager::CheckRts ( AarfcdWifiRemoteStation * station )

private

Definition at line 333 of file aarfcd-wifi-manager.cc.

References ns3::AarfcdWifiRemoteStation::m_rtsCounter, ns3::AarfcdWifiRemoteStation::m_rtsOn, NS_LOG_FUNCTION, and TurnOffRts().

Referenced by DoReportDataFailed(), and DoReportDataOk().

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WifiRemoteStation * ns3::AarfcdWifiManager::DoCreateStation ( void ) const

privatevirtual

Definition at line 121 of file aarfcd-wifi-manager.cc.

WifiMode ns3::AarfcdWifiManager::DoGetDataMode	(	WifiRemoteStation *	station,
		uint32_t	size
	)

privatevirtual

Definition at line 298 of file aarfcd-wifi-manager.cc.

References ns3::WifiRemoteStationManager::GetSupported(), ns3::AarfcdWifiRemoteStation::m_rate, and NS_LOG_FUNCTION.

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WifiMode ns3::AarfcdWifiManager::DoGetRtsMode ( WifiRemoteStation * station )

privatevirtual

Definition at line 305 of file aarfcd-wifi-manager.cc.

References ns3::WifiRemoteStationManager::GetSupported(), and NS_LOG_FUNCTION.

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bool ns3::AarfcdWifiManager::DoNeedRts	(	WifiRemoteStation *	station,
		Ptr< const Packet >	packet,
		bool	normally
	)

privatevirtual

Definition at line 315 of file aarfcd-wifi-manager.cc.

References ns3::AarfcdWifiRemoteStation::m_rate, ns3::AarfcdWifiRemoteStation::m_rtsCounter, ns3::AarfcdWifiRemoteStation::m_rtsOn, NS_LOG_FUNCTION, and NS_LOG_INFO.

void ns3::AarfcdWifiManager::DoReportDataFailed ( WifiRemoteStation * st )

privatevirtual

It is important to realize that "recovery" mode starts after failure of the first transmission after a rate increase and ends at the first successful transmission. Specifically, recovery mode transcends retransmissions boundaries. Fundamentally, ARF handles each data transmission independently, whether it is the initial transmission of a packet or the retransmission of a packet. The fundamental reason for this is that there is a backoff between each data transmission, be it an initial transmission or a retransmission.

Definition at line 161 of file aarfcd-wifi-manager.cc.