The Traffic Indication Map Information Element. More...

#include "tim.h"

Inheritance diagram for ns3::Tim:

Collaboration diagram for ns3::Tim:

Public Member Functions
template<typename Iterator >
void	AddAid (Iterator begin, Iterator end)
	Add the AID values in the provided iterator range to the list contained in the Virtual Bitmap.

void	AddAid (uint16_t aid)
	Add the provided AID value to the list contained in the Virtual Bitmap.

WifiInformationElementId	ElementId () const override
	Get the wifi information element ID.

std::set< uint16_t >	GetAidSet (uint16_t aid=0) const
	Return the AID values, greater than the given AID value, whose corresponding bits are set in the virtual bitmap.

uint8_t	GetLastNonZeroOctetIndex () const

uint8_t	GetPartialVirtualBitmapOffset () const
	Get the Partial Virtual Bitmap offset, i.e., the number (denoted as N1 by the specs) of the first octet included in the Partial Virtual Bitmap.

bool	HasAid (uint16_t aid) const
	Check whether the bit corresponding to the provided AID is set in the Virtual Bitmap included in this TIM.

void	Print (std::ostream &os) const override
	Generate human-readable form of IE.

Public Member Functions inherited from ns3::WifiInformationElement
virtual	~WifiInformationElement ()

Buffer::Iterator	Deserialize (Buffer::Iterator i)
	Deserialize entire IE (which may possibly be fragmented into multiple elements), which must be present.

Buffer::Iterator	DeserializeIfPresent (Buffer::Iterator i)
	Deserialize entire IE (which may possibly be fragmented into multiple elements) if it is present.

virtual WifiInformationElementId	ElementIdExt () const
	Get the wifi information element ID extension.

uint16_t	GetSerializedSize () const
	Get the size of the serialized IE including Element ID and length fields (for every element this IE is possibly fragmented into).

virtual bool	operator== (const WifiInformationElement &a) const
	Compare two IEs for equality by ID & Length, and then through memcmp of serialised version.

Buffer::Iterator	Serialize (Buffer::Iterator i) const
	Serialize entire IE including Element ID and length fields.

Public Member Functions inherited from ns3::SimpleRefCount< WifiInformationElement >
	SimpleRefCount ()
	Default constructor.

	SimpleRefCount (const SimpleRefCount &o)
	Copy constructor.

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

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

void	Ref () const
	Increment the reference count.

void	Unref () const
	Decrement the reference count.

Public Attributes
uint8_t	m_dtimCount {0}
	The DTIM Count field.

uint8_t	m_dtimPeriod {0}
	The DTIM Period field.

bool	m_hasMulticastPending {false}
	Whether there is Multicast / Broadcast data.

Private Member Functions
uint16_t	DeserializeInformationField (Buffer::Iterator start, uint16_t length) override
	Deserialize information (i.e., the body of the IE, not including the Element ID and length octets)

uint8_t	GetAidBit (uint16_t aid) const
	Obtain an octet with a set bit, corresponding to the provided AID value.

uint16_t	GetAidFromOctetIndexAndBitPosition (uint16_t octet, uint8_t position) const
	Obtain the AID value represented by a certain octet index and bit position inside the Virtual Bitmap.

uint8_t	GetAidOctetIndex (uint16_t aid) const
	Obtain the index of the octet where the provided AID value should be set in the Virtual Bitmap.

uint8_t	GetBitmapControl () const
	The Bitmap Control field is optional if the TIM is carried in an S1G PPDU, while it is always present when the TIM is carried in a non-S1G PPDU.

uint16_t	GetInformationFieldSize () const override
	Length of serialized information (i.e., the length of the body of the IE, not including the Element ID and length octets.

std::vector< uint8_t >	GetPartialVirtualBitmap () const

void	SerializeInformationField (Buffer::Iterator start) const override
	Serialize information (i.e., the body of the IE, not including the Element ID and length octets)

Private Attributes
std::set< uint16_t >	m_aidValues
	List of AID values included in this TIM.

Detailed Description

The Traffic Indication Map Information Element.

The 802.11 Traffic Indication Map (see section 9.4.2.5 of 802.11-2020)

Note: The current implementation does not support S1G operation, or multiple BSSID.

Definition at line 28 of file tim.h.

Member Function Documentation

◆ AddAid() [1/2]

template<typename Iterator >

void ns3::Tim::AddAid	(	Iterator	begin,
		Iterator	end )

Add the AID values in the provided iterator range to the list contained in the Virtual Bitmap.

Template Parameters

Iterator Type of iterator

Parameters

begin	Starting position of the iterator range
end	Ending position of the iterator range

Definition at line 140 of file tim.h.

References AddAid().

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◆ AddAid() [2/2]

void ns3::Tim::AddAid ( uint16_t aid )

Add the provided AID value to the list contained in the Virtual Bitmap.

Parameters

aid	the AID value to add to this TIM's Virtual Bitmap

Definition at line 38 of file tim.cc.

References m_aidValues, and NS_ABORT_IF.

Referenced by AddAid(), and TimInformationElementTest::SetTim().

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◆ DeserializeInformationField()

uint16_t ns3::Tim::DeserializeInformationField	(	Buffer::Iterator	start,
		uint16_t	length )

overrideprivatevirtual

Deserialize information (i.e., the body of the IE, not including the Element ID and length octets)

Parameters

start	an iterator which points to where the information should be written.
length	the expected number of bytes to read

Returns: the number of bytes read

Implements ns3::WifiInformationElement.

Definition at line 75 of file tim.cc.

References GetAidFromOctetIndexAndBitPosition(), m_aidValues, m_dtimCount, m_dtimPeriod, m_hasMulticastPending, and NS_ABORT_MSG_IF.

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◆ ElementId()

WifiInformationElementId ns3::Tim::ElementId ( ) const

overridevirtual

Get the wifi information element ID.

Returns: the wifi information element ID

Implements ns3::WifiInformationElement.

Definition at line 18 of file tim.cc.

References IE_TIM.

◆ GetAidBit()

uint8_t ns3::Tim::GetAidBit ( uint16_t aid ) const

private

Obtain an octet with a set bit, corresponding to the provided AID value.

Parameters

aid	the provided AID value

Returns: an octet with a set bit, corresponding to the provided AID value

Definition at line 127 of file tim.cc.

Referenced by GetPartialVirtualBitmap().

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◆ GetAidFromOctetIndexAndBitPosition()

uint16_t ns3::Tim::GetAidFromOctetIndexAndBitPosition	(	uint16_t	octet,
		uint8_t	position ) const

private

Obtain the AID value represented by a certain octet index and bit position inside the Virtual Bitmap.

Parameters

octet	the octet index in the Virtual Bitmap
position	the bit position in the octet of the Virtual Bitmap

Returns: the corresponding AID value

Definition at line 136 of file tim.cc.

Referenced by DeserializeInformationField().

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◆ GetAidOctetIndex()

uint8_t ns3::Tim::GetAidOctetIndex ( uint16_t aid ) const

private

Obtain the index of the octet where the provided AID value should be set in the Virtual Bitmap.

Parameters

aid	the provided AID value

Returns: the index of the octet where the provided AID value should be set in the Virtual Bitmap

Definition at line 118 of file tim.cc.

Referenced by GetLastNonZeroOctetIndex(), GetPartialVirtualBitmap(), and GetPartialVirtualBitmapOffset().

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◆ GetAidSet()

std::set< uint16_t > ns3::Tim::GetAidSet ( uint16_t aid = 0 ) const

Return the AID values, greater than the given AID value, whose corresponding bits are set in the virtual bitmap.

Parameters

aid	the given AID value

Returns: the AID values, greater than the given AID value, whose corresponding bits are set in the virtual bitmap

Definition at line 52 of file tim.cc.

References m_aidValues.

Referenced by TimInformationElementTest::CheckAidSet().

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◆ GetBitmapControl()

uint8_t ns3::Tim::GetBitmapControl ( ) const

private

The Bitmap Control field is optional if the TIM is carried in an S1G PPDU, while it is always present when the TIM is carried in a non-S1G PPDU.

Returns: the value of the Bitmap Control field

Definition at line 172 of file tim.cc.

References GetPartialVirtualBitmapOffset(), m_dtimCount, and m_hasMulticastPending.

Referenced by SerializeInformationField().

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◆ GetInformationFieldSize()

uint16_t ns3::Tim::GetInformationFieldSize ( ) const

overrideprivatevirtual

Length of serialized information (i.e., the length of the body of the IE, not including the Element ID and length octets.

This is the value that will appear in the second octet of the entire IE - the length field - if the IE is not fragmented)

Returns: the length of serialized information

Implements ns3::WifiInformationElement.

Definition at line 24 of file tim.cc.

References GetLastNonZeroOctetIndex(), and GetPartialVirtualBitmapOffset().

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◆ GetLastNonZeroOctetIndex()

uint8_t ns3::Tim::GetLastNonZeroOctetIndex ( ) const

Returns: the last non-zero octet in the virtual bitmap (denoted as N2 by the specs)

Definition at line 157 of file tim.cc.

References GetAidOctetIndex(), and m_aidValues.

Referenced by GetInformationFieldSize(), and GetPartialVirtualBitmap().

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◆ GetPartialVirtualBitmap()

std::vector< uint8_t > ns3::Tim::GetPartialVirtualBitmap ( ) const

private

Returns: a vector containing the Partial Virtual Bitmap octets

Definition at line 189 of file tim.cc.

References GetAidBit(), GetAidOctetIndex(), GetLastNonZeroOctetIndex(), GetPartialVirtualBitmapOffset(), and m_aidValues.

Referenced by SerializeInformationField().

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◆ GetPartialVirtualBitmapOffset()

uint8_t ns3::Tim::GetPartialVirtualBitmapOffset ( ) const

Get the Partial Virtual Bitmap offset, i.e., the number (denoted as N1 by the specs) of the first octet included in the Partial Virtual Bitmap.

Note that the Bitmap Offset subfield contains the number N1/2.

Returns: the Partial Virtual Bitmap offset

Definition at line 142 of file tim.cc.

References GetAidOctetIndex(), and m_aidValues.

Referenced by GetBitmapControl(), GetInformationFieldSize(), and GetPartialVirtualBitmap().

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◆ HasAid()

bool ns3::Tim::HasAid ( uint16_t aid ) const

Check whether the bit corresponding to the provided AID is set in the Virtual Bitmap included in this TIM.

Parameters

aid	The AID value to look for

Returns: True if the AID value is found in the Virtual Bitmap, false otherwise

Definition at line 46 of file tim.cc.

References m_aidValues.

Referenced by Print().

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◆ Print()

void ns3::Tim::Print ( std::ostream & os ) const

overridevirtual

Generate human-readable form of IE.

Parameters

os	output stream

Reimplemented from ns3::WifiInformationElement.

Definition at line 206 of file tim.cc.

References HasAid(), m_dtimCount, m_dtimPeriod, and m_hasMulticastPending.

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◆ SerializeInformationField()

void ns3::Tim::SerializeInformationField ( Buffer::Iterator start ) const

overrideprivatevirtual

Serialize information (i.e., the body of the IE, not including the Element ID and length octets)

Parameters

start an iterator which points to where the information should be written.

Implements ns3::WifiInformationElement.

Definition at line 59 of file tim.cc.

References GetBitmapControl(), GetPartialVirtualBitmap(), m_dtimCount, and m_dtimPeriod.

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Member Data Documentation

◆ m_aidValues

std::set<uint16_t> ns3::Tim::m_aidValues

private

List of AID values included in this TIM.

Definition at line 135 of file tim.h.

Referenced by AddAid(), DeserializeInformationField(), GetAidSet(), GetLastNonZeroOctetIndex(), GetPartialVirtualBitmap(), GetPartialVirtualBitmapOffset(), and HasAid().

◆ m_dtimCount

uint8_t ns3::Tim::m_dtimCount {0}

The DTIM Count field.

Definition at line 85 of file tim.h.

Referenced by DeserializeInformationField(), GetBitmapControl(), Print(), SerializeInformationField(), and TimInformationElementTest::SetTim().

◆ m_dtimPeriod

uint8_t ns3::Tim::m_dtimPeriod {0}

The DTIM Period field.

Definition at line 86 of file tim.h.

Referenced by DeserializeInformationField(), Print(), SerializeInformationField(), and TimInformationElementTest::SetTim().

◆ m_hasMulticastPending

bool ns3::Tim::m_hasMulticastPending {false}

Whether there is Multicast / Broadcast data.

Definition at line 87 of file tim.h.

Referenced by DeserializeInformationField(), GetBitmapControl(), Print(), and TimInformationElementTest::SetTim().

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

src/wifi/model/tim.h
src/wifi/model/tim.cc

Public Member Functions

Public Attributes

Private Member Functions

Private Attributes

Detailed Description

Member Function Documentation

◆ AddAid() [1/2]

◆ AddAid() [2/2]

◆ DeserializeInformationField()

◆ ElementId()

◆ GetAidBit()

◆ GetAidFromOctetIndexAndBitPosition()

◆ GetAidOctetIndex()

◆ GetAidSet()

◆ GetBitmapControl()

◆ GetInformationFieldSize()

◆ GetLastNonZeroOctetIndex()

◆ GetPartialVirtualBitmap()

◆ GetPartialVirtualBitmapOffset()

◆ HasAid()

◆ Print()

◆ SerializeInformationField()

Member Data Documentation

◆ m_aidValues

◆ m_dtimCount

◆ m_dtimPeriod

◆ m_hasMulticastPending