ARF Rate control algorithm. More...

#include <arf-wifi-manager.h>

Inheritance diagram for ns3::ArfWifiManager:

Collaboration diagram for ns3::ArfWifiManager:

Public Member Functions
	ArfWifiManager ()
virtual	~ArfWifiManager ()
Public Member Functions inherited from ns3::WifiRemoteStationManager
	WifiRemoteStationManager ()
virtual	~WifiRemoteStationManager ()
void	AddBasicMcs (uint8_t mcs)
void	AddBasicMode (WifiMode mode)
void	AddStationHtCapabilities (Mac48Address from, HtCapabilities htcapabilities)
void	AddSupportedMcs (Mac48Address address, uint8_t mcs)
void	AddSupportedMode (Mac48Address address, WifiMode mode)
WifiTxVector	DoGetCtsToSelfTxVector (void)
WifiTxVector	GetAckTxVector (Mac48Address address, WifiMode dataMode)
uint8_t	GetBasicMcs (uint32_t i) const
WifiMode	GetBasicMode (uint32_t i) const
WifiTxVector	GetBlockAckTxVector (Mac48Address address, WifiMode dataMode)
WifiTxVector	GetCtsToSelfTxVector (const WifiMacHeader *header, Ptr< const Packet > packet)
WifiTxVector	GetCtsTxVector (Mac48Address address, WifiMode rtsMode)
WifiTxVector	GetDataTxVector (Mac48Address address, const WifiMacHeader *header, Ptr< const Packet > packet, uint32_t fullPacketSize)
uint8_t	GetDefaultMcs (void) const
WifiMode	GetDefaultMode (void) const
uint8_t	GetDefaultTxPowerLevel (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)
bool	GetGreenfieldSupported (Mac48Address address) const
WifiRemoteStationInfo	GetInfo (Mac48Address address)
uint32_t	GetMaxSlrc (void) const
uint32_t	GetMaxSsrc (void) const
uint32_t	GetNBasicMcs (void) const
uint32_t	GetNBasicModes (void) const
WifiMode	GetNonUnicastMode (void) const
uint32_t	GetNumberOfTransmitAntennas (void)
uint32_t	GetRtsCtsThreshold (void) const
WifiTxVector	GetRtsTxVector (Mac48Address address, const WifiMacHeader *header, Ptr< const Packet > packet)
bool	HasHtSupported (void) const
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	NeedCtsToSelf (WifiTxVector txVector)
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	SetDefaultTxPowerLevel (uint8_t txPower)
void	SetFragmentationThreshold (uint32_t threshold)
void	SetHtSupported (bool enable)
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
virtual WifiRemoteStation *	DoCreateStation (void) const
virtual WifiTxVector	DoGetDataTxVector (WifiRemoteStation *station, uint32_t size)
virtual WifiTxVector	DoGetRtsTxVector (WifiRemoteStation *station)
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)
virtual bool	IsLowLatency (void) const

Private Attributes
uint32_t	m_successThreshold
uint32_t	m_timerThreshold

Additional Inherited Members
Protected Member Functions inherited from ns3::WifiRemoteStationManager
virtual void	DoDispose (void)
bool	GetGreenfield (const WifiRemoteStation *station) const
uint32_t	GetLongRetryCount (const WifiRemoteStation *station) const
uint8_t	GetMcsSupported (const WifiRemoteStation *station, uint32_t i) const
uint32_t	GetNMcsSupported (const WifiRemoteStation *station) const
uint32_t	GetNSupported (const WifiRemoteStation *station) const
uint32_t	GetNumberOfReceiveAntennas (const WifiRemoteStation *station) const
uint32_t	GetNumberOfTransmitAntennas (const WifiRemoteStation *station) const
bool	GetShortGuardInterval (const WifiRemoteStation *station) const
uint32_t	GetShortRetryCount (const WifiRemoteStation *station) const
bool	GetStbc (const WifiRemoteStation *station) const
WifiMode	GetSupported (const WifiRemoteStation *station, uint32_t i) const

Detailed Description

ARF Rate control algorithm.

This class implements the so-called ARF algorithm which was initially described in WaveLAN-II: A High-performance wireless LAN for the unlicensed band, by A. Kamerman and L. Monteban. in Bell Lab Technical Journal, pages 118-133, Summer 1997.

This implementation differs from the initial description in that it uses a packet-based timer rather than a time-based timer as described in XXX (I cannot find back the original paper which described how the time-based timer could be easily replaced with a packet-based timer.)

Config Paths

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

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

Attributes

TimerThreshold: The 'timer' threshold in the ARF algorithm.
- Set with class: ns3::UintegerValue
- Underlying type: uint32_t 0:4294967295
- Initial value: 15
- Flags: construct write read
SuccessThreshold: The minimum number of sucessfull transmissions to try a new rate.
- Set with class: ns3::UintegerValue
- Underlying type: uint32_t 0:4294967295
- Initial value: 10
- 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
DefaultTxPowerLevel: Default power level to be used for transmissions. This is the power level that is used by all those WifiManagers that do notimplement TX power control.
- Set with class: ns3::UintegerValue
- Underlying type: uint8_t 0:255
- Initial value: 0
- 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 42 of file arf-wifi-manager.h.

Constructor & Destructor Documentation

ns3::ArfWifiManager::ArfWifiManager ( )

Definition at line 68 of file arf-wifi-manager.cc.

References NS_LOG_FUNCTION.

ns3::ArfWifiManager::~ArfWifiManager ( )

virtual

Definition at line 72 of file arf-wifi-manager.cc.

References NS_LOG_FUNCTION.

Member Function Documentation

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

privatevirtual

Definition at line 77 of file arf-wifi-manager.cc.

References ns3::ArfWifiRemoteStation::m_failed, ns3::ArfWifiRemoteStation::m_rate, ns3::ArfWifiRemoteStation::m_recovery, ns3::ArfWifiRemoteStation::m_retry, ns3::ArfWifiRemoteStation::m_success, ns3::ArfWifiRemoteStation::m_successThreshold, m_successThreshold, ns3::ArfWifiRemoteStation::m_timer, m_timerThreshold, ns3::ArfWifiRemoteStation::m_timerTimeout, and NS_LOG_FUNCTION.

WifiTxVector ns3::ArfWifiManager::DoGetDataTxVector	(	WifiRemoteStation *	station,
		uint32_t	size
	)

privatevirtual

Definition at line 194 of file arf-wifi-manager.cc.

References ns3::WifiRemoteStationManager::GetDefaultTxPowerLevel(), ns3::WifiRemoteStationManager::GetLongRetryCount(), ns3::WifiRemoteStationManager::GetNumberOfReceiveAntennas(), ns3::WifiRemoteStationManager::GetNumberOfTransmitAntennas(), ns3::WifiRemoteStationManager::GetShortGuardInterval(), ns3::WifiRemoteStationManager::GetStbc(), ns3::WifiRemoteStationManager::GetSupported(), ns3::ArfWifiRemoteStation::m_rate, ns3::Min(), and NS_LOG_FUNCTION.

Here is the call graph for this function:

WifiTxVector ns3::ArfWifiManager::DoGetRtsTxVector ( WifiRemoteStation * station )

privatevirtual

Todo:: we could/should implement the Arf algorithm for RTS only by picking a single rate within the BasicRateSet.

Definition at line 201 of file arf-wifi-manager.cc.

References ns3::WifiRemoteStationManager::GetDefaultTxPowerLevel(), ns3::WifiRemoteStationManager::GetLongRetryCount(), ns3::WifiRemoteStationManager::GetNumberOfReceiveAntennas(), ns3::WifiRemoteStationManager::GetNumberOfTransmitAntennas(), ns3::WifiRemoteStationManager::GetShortGuardInterval(), ns3::WifiRemoteStationManager::GetStbc(), ns3::WifiRemoteStationManager::GetSupported(), ns3::Min(), and NS_LOG_FUNCTION.

Here is the call graph for this function:

void ns3::ArfWifiManager::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 109 of file arf-wifi-manager.cc.

References ns3::ArfWifiRemoteStation::m_failed, ns3::ArfWifiRemoteStation::m_rate, ns3::ArfWifiRemoteStation::m_recovery, ns3::ArfWifiRemoteStation::m_retry, ns3::ArfWifiRemoteStation::m_success, ns3::ArfWifiRemoteStation::m_timer, NS_ASSERT, and NS_LOG_FUNCTION.