Automatic Neighbour Relation function. More...

#include "lte-anr.h"

Inheritance diagram for ns3::LteAnr:

Collaboration diagram for ns3::LteAnr:

Classes
struct	NeighbourRelation_t
	Neighbour Relation between two eNodeBs (serving eNodeB and neighbour eNodeB). More...

Public Member Functions
	LteAnr (uint16_t servingCellId)
	Creates an ANR instance.

	~LteAnr () override

void	AddNeighbourRelation (uint16_t cellId)
	Provide an advance information about a related neighbouring cell and add it as a new Neighbour Relation entry.

virtual LteAnrSapProvider *	GetLteAnrSapProvider ()
	Export the "provider" part of the ANR SAP interface.

void	RemoveNeighbourRelation (uint16_t cellId)
	Remove an existing Neighbour Relation entry.

virtual void	SetLteAnrSapUser (LteAnrSapUser *s)
	Set the "user" part of the ANR SAP interface that this ANR instance will interact with.

Public Member Functions inherited from ns3::Object
	Object ()
	Constructor.

	~Object () override
	Destructor.

void	AggregateObject (Ptr< Object > other)
	Aggregate two Objects together.

void	Dispose ()
	Dispose of this Object.

AggregateIterator	GetAggregateIterator () const
	Get an iterator to the Objects aggregated to this one.

TypeId	GetInstanceTypeId () const override
	Get the most derived TypeId for this Object.

template<typename T >
Ptr< T >	GetObject () const
	Get a pointer to the requested aggregated Object.

template<>
Ptr< Object >	GetObject () const
	Specialization of () for objects of type ns3::Object.

template<typename T >
Ptr< T >	GetObject (TypeId tid) const
	Get a pointer to the requested aggregated Object by TypeId.

template<>
Ptr< Object >	GetObject (TypeId tid) const
	Specialization of (TypeId tid) for objects of type ns3::Object.

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

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

void	UnidirectionalAggregateObject (Ptr< Object > other)
	Aggregate an Object to another Object.

Public Member Functions inherited from ns3::SimpleRefCount< Object, ObjectBase, ObjectDeleter >
	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 Member Functions inherited from ns3::ObjectBase
virtual	~ObjectBase ()
	Virtual destructor.

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

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

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

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

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

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

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

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

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

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

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

Protected Member Functions
void	DoDispose () override
	Destructor implementation.

void	DoInitialize () override
	Initialize() implementation.

Protected Member Functions inherited from ns3::Object
	Object (const Object &o)
	Copy an Object.

virtual void	NotifyNewAggregate ()
	Notify all Objects aggregated to this one of a new Object being aggregated.

Protected Member Functions inherited from ns3::ObjectBase
void	ConstructSelf (const AttributeConstructionList &attributes)
	Complete construction of ObjectBase; invoked by derived classes.

virtual void	NotifyConstructionCompleted ()
	Notifier called once the ObjectBase is fully constructed.

Private Types
typedef std::map< uint16_t, NeighbourRelation_t >	NeighbourRelationTable_t
	cellId

Private Member Functions
void	DoAddNeighbourRelation (uint16_t cellId)
	Implementation of LteAnrSapProvider::AddNeighbourRelation.

bool	DoGetNoHo (uint16_t cellId) const
	Implementation of LteAnrSapProvider::GetNoHo.

bool	DoGetNoRemove (uint16_t cellId) const
	Implementation of LteAnrSapProvider::GetNoRemove.

bool	DoGetNoX2 (uint16_t cellId) const
	Implementation of LteAnrSapProvider::GetNoX2.

void	DoReportUeMeas (LteRrcSap::MeasResults measResults)
	Implementation of LteAnrSapProvider::ReportUeMeas.

const NeighbourRelation_t *	Find (uint16_t cellId) const

Private Attributes
LteAnrSapProvider *	m_anrSapProvider
	Reference to the "provider" part of the ANR SAP interface, which is automatically created when this class instantiates.

LteAnrSapUser *	m_anrSapUser
	Reference to the "user" part of the ANR SAP interface, which is provided by the eNodeB RRC instance.

uint8_t	m_measId
	The expected measurement identity.

NeighbourRelationTable_t	m_neighbourRelationTable
	neighbor relation table

uint16_t	m_servingCellId
	Serving cell ID.

uint8_t	m_threshold
	The attribute Threshold.

Friends
class	MemberLteAnrSapProvider< LteAnr >
	let the forwarder class access the protected and private members

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

Detailed Description

Automatic Neighbour Relation function.

ANR is a conceptually a list of neighbouring cells called the Neighbour Relation Table (NRT). ANR has the capability of automatically inserting new entries into NRT based on measurement reports obtained from the eNodeB RRC instance. Besides this, ANR also supports manual insertion and accepts queries for the NRT content.

The LteHelper class automatically installs one ANR instance for each eNodeB RRC instance. When installed, ANR will assist the eNodeB RRC's handover function, e.g., by preventing an X2-based handover execution if there is no X2 interface to the target neighbour cell. If this is not desired, it can be disabled by the following code sample:

Config::SetDefault ("ns3::LteHelper::AnrEnabled", BooleanValue (false));
Ptr<LteHelper> lteHelper = CreateObject<LteHelper> ();

The communication between an ANR instance and the eNodeB RRC instance is done through the ANR SAP interface. The ANR instance corresponds to the "provider" part of this interface, while the eNodeB RRC instance takes the role of the "user" part. The following code skeleton establishes the connection between both instances:

Ptr<LteEnbRrc> u = ...;
Ptr<LteAnr> p = ...;
u->SetLteAnrSapProvider (p->GetLteAnrSapProvider ());
p->SetLteAnrSapUser (u->GetLteAnrSapUser ());

However, user rarely needs to use the above code, since it has already been taken care by LteHelper::InstallEnbDevice.

The current ANR model is inspired from Section 22.3.2a and 22.3.3 of 3GPP TS 36.300.

See also: SetLteAnrSapProvider, SetLteAnrSapUser

Definition at line 70 of file lte-anr.h.

Member Typedef Documentation

◆ NeighbourRelationTable_t

typedef std::map<uint16_t, NeighbourRelation_t> ns3::LteAnr::NeighbourRelationTable_t

private

cellId

Definition at line 207 of file lte-anr.h.

Constructor & Destructor Documentation

◆ LteAnr()

ns3::LteAnr::LteAnr ( uint16_t servingCellId )

Creates an ANR instance.

Parameters

servingCellId the cell ID of the eNodeB instance whom this ANR instance is to be associated with

Definition at line 28 of file lte-anr.cc.

References m_anrSapProvider, MemberLteAnrSapProvider< LteAnr >, and NS_LOG_FUNCTION.

◆ ~LteAnr()

ns3::LteAnr::~LteAnr ( )

override

Definition at line 38 of file lte-anr.cc.

References m_servingCellId, and NS_LOG_FUNCTION.

Member Function Documentation

◆ AddNeighbourRelation()

void ns3::LteAnr::AddNeighbourRelation ( uint16_t cellId )

Provide an advance information about a related neighbouring cell and add it as a new Neighbour Relation entry.

Parameters

cellId the cell ID of the new neighbour

This function simulates the Neighbour Relation addition operation by network operations and maintenance, as depicted in Section 22.3.2a of 3GPP TS 36.300.

An entry added by this function will have the NoRemove flag set to TRUE and the NoHo flag set to TRUE. Hence, the cell may not act as the target cell of a handover, unless a measurement report of the cell is received, which will update the NoHo flag to FALSE.

Definition at line 62 of file lte-anr.cc.

References ns3::LteAnr::NeighbourRelation_t::detectedAsNeighbour, m_neighbourRelationTable, m_servingCellId, ns3::LteAnr::NeighbourRelation_t::noHo, ns3::LteAnr::NeighbourRelation_t::noRemove, ns3::LteAnr::NeighbourRelation_t::noX2, NS_FATAL_ERROR, and NS_LOG_FUNCTION.

Referenced by DoAddNeighbourRelation().

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◆ DoAddNeighbourRelation()

void ns3::LteAnr::DoAddNeighbourRelation ( uint16_t cellId )

private

Implementation of LteAnrSapProvider::AddNeighbourRelation.

Parameters

cellId the Physical Cell ID of the new neighbouring cell

Definition at line 203 of file lte-anr.cc.

References AddNeighbourRelation(), and NS_LOG_FUNCTION.

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◆ DoDispose()

void ns3::LteAnr::DoDispose ( )

overrideprotectedvirtual

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::Object.

Definition at line 128 of file lte-anr.cc.

References m_anrSapProvider, m_neighbourRelationTable, and NS_LOG_FUNCTION.

◆ DoGetNoHo()

bool ns3::LteAnr::DoGetNoHo ( uint16_t cellId ) const

private

Implementation of LteAnrSapProvider::GetNoHo.

Parameters

cellId the Physical Cell ID of the neighbouring cell of interest

Returns: if true, the Neighbour Relation shall not be used by the eNodeB for handover reasons

Definition at line 217 of file lte-anr.cc.

References Find(), m_servingCellId, ns3::LteAnr::NeighbourRelation_t::noHo, and NS_LOG_FUNCTION.

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◆ DoGetNoRemove()

bool ns3::LteAnr::DoGetNoRemove ( uint16_t cellId ) const

private

Implementation of LteAnrSapProvider::GetNoRemove.

Parameters

cellId the Physical Cell ID of the neighbouring cell of interest

Returns: if true, the Neighbour Relation shall not be removed from the NRT

Definition at line 210 of file lte-anr.cc.

References Find(), m_servingCellId, ns3::LteAnr::NeighbourRelation_t::noRemove, and NS_LOG_FUNCTION.

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◆ DoGetNoX2()

bool ns3::LteAnr::DoGetNoX2 ( uint16_t cellId ) const

private

Implementation of LteAnrSapProvider::GetNoX2.

Parameters

cellId the Physical Cell ID of the neighbouring cell of interest

Returns: if true, the Neighbour Relation shall not use an X2 interface in order to initiate procedures towards the eNodeB parenting the target cell

Definition at line 224 of file lte-anr.cc.

References Find(), m_servingCellId, ns3::LteAnr::NeighbourRelation_t::noX2, and NS_LOG_FUNCTION.

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◆ DoInitialize()

void ns3::LteAnr::DoInitialize ( )

overrideprotectedvirtual

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.

Definition at line 113 of file lte-anr.cc.

References ns3::LteAnrSapUser::AddUeMeasReportConfigForAnr(), ns3::LteRrcSap::ThresholdEutra::choice, ns3::LteRrcSap::ReportConfigEutra::EVENT_A4, ns3::LteRrcSap::ReportConfigEutra::eventId, m_anrSapUser, m_measId, m_threshold, ns3::LteRrcSap::ReportConfigEutra::MS480, NS_LOG_FUNCTION, NS_LOG_LOGIC, ns3::LteRrcSap::ThresholdEutra::range, ns3::LteRrcSap::ReportConfigEutra::reportInterval, ns3::LteRrcSap::ReportConfigEutra::RSRQ, ns3::LteRrcSap::ReportConfigEutra::threshold1, ns3::LteRrcSap::ThresholdEutra::THRESHOLD_RSRQ, and ns3::LteRrcSap::ReportConfigEutra::triggerQuantity.

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◆ DoReportUeMeas()

void ns3::LteAnr::DoReportUeMeas ( LteRrcSap::MeasResults measResults )

private

Implementation of LteAnrSapProvider::ReportUeMeas.

Parameters

measResults a single report of one measurement identity

Todo: Remove neighbours in the NRT.

Definition at line 136 of file lte-anr.cc.

References ns3::LteAnr::NeighbourRelation_t::detectedAsNeighbour, ns3::LteRrcSap::MeasResults::haveMeasResultNeighCells, m_measId, m_neighbourRelationTable, m_servingCellId, ns3::LteRrcSap::MeasResults::measId, ns3::LteRrcSap::MeasResults::measResultListEutra, ns3::LteAnr::NeighbourRelation_t::noHo, ns3::LteAnr::NeighbourRelation_t::noRemove, ns3::LteAnr::NeighbourRelation_t::noX2, NS_ASSERT_MSG, NS_LOG_FUNCTION, NS_LOG_LOGIC, and NS_LOG_WARN.

◆ Find()

const LteAnr::NeighbourRelation_t * ns3::LteAnr::Find ( uint16_t cellId ) const

private

Internal: methods

Parameters

cellId

Returns: the neighbor relation

Definition at line 231 of file lte-anr.cc.

References m_neighbourRelationTable, and NS_FATAL_ERROR.

Referenced by DoGetNoHo(), DoGetNoRemove(), and DoGetNoX2().

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◆ GetLteAnrSapProvider()

LteAnrSapProvider * ns3::LteAnr::GetLteAnrSapProvider ( )

virtual

Export the "provider" part of the ANR SAP interface.

Returns: the reference to the "provider" part of the interface, typically to be kept by an LteEnbRrc instance

Definition at line 106 of file lte-anr.cc.

References m_anrSapProvider, and NS_LOG_FUNCTION.

◆ GetTypeId()

TypeId ns3::LteAnr::GetTypeId ( )

static

Get the type ID.

Returns: the object TypeId

Definition at line 44 of file lte-anr.cc.

References m_threshold, ns3::MakeUintegerAccessor(), ns3::MakeUintegerChecker(), and ns3::TypeId::SetParent().

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◆ RemoveNeighbourRelation()

void ns3::LteAnr::RemoveNeighbourRelation ( uint16_t cellId )

Remove an existing Neighbour Relation entry.

Parameters

cellId the cell ID to be removed from the NRT

This function simulates the Neighbour Relation removal operation by network operations and maintenance, as depicted in Section 22.3.2a of 3GPP TS 36.300.

Definition at line 85 of file lte-anr.cc.

References m_neighbourRelationTable, m_servingCellId, NS_FATAL_ERROR, and NS_LOG_FUNCTION.

◆ SetLteAnrSapUser()

void ns3::LteAnr::SetLteAnrSapUser ( LteAnrSapUser * s )

virtual

Set the "user" part of the ANR SAP interface that this ANR instance will interact with.

Parameters

s	a reference to the "user" part of the interface, typically a member of an LteEnbRrc instance

Definition at line 99 of file lte-anr.cc.

References m_anrSapUser, and NS_LOG_FUNCTION.

Friends And Related Symbol Documentation

◆ MemberLteAnrSapProvider< LteAnr >

friend class MemberLteAnrSapProvider< LteAnr >

friend

let the forwarder class access the protected and private members

Definition at line 126 of file lte-anr.h.

Referenced by LteAnr().

Member Data Documentation

◆ m_anrSapProvider

LteAnrSapProvider* ns3::LteAnr::m_anrSapProvider

private

Reference to the "provider" part of the ANR SAP interface, which is automatically created when this class instantiates.

Definition at line 181 of file lte-anr.h.

Referenced by LteAnr(), DoDispose(), and GetLteAnrSapProvider().

◆ m_anrSapUser

LteAnrSapUser* ns3::LteAnr::m_anrSapUser

private

Reference to the "user" part of the ANR SAP interface, which is provided by the eNodeB RRC instance.

Definition at line 187 of file lte-anr.h.

Referenced by DoInitialize(), and SetLteAnrSapUser().

◆ m_measId

uint8_t ns3::LteAnr::m_measId

private

The expected measurement identity.

Definition at line 220 of file lte-anr.h.

Referenced by DoInitialize(), and DoReportUeMeas().

◆ m_neighbourRelationTable

NeighbourRelationTable_t ns3::LteAnr::m_neighbourRelationTable

private

neighbor relation table

Definition at line 210 of file lte-anr.h.

Referenced by AddNeighbourRelation(), DoDispose(), DoReportUeMeas(), Find(), and RemoveNeighbourRelation().

◆ m_servingCellId

uint16_t ns3::LteAnr::m_servingCellId

private

Serving cell ID.

Definition at line 223 of file lte-anr.h.

Referenced by ~LteAnr(), AddNeighbourRelation(), DoGetNoHo(), DoGetNoRemove(), DoGetNoX2(), DoReportUeMeas(), and RemoveNeighbourRelation().

◆ m_threshold

uint8_t ns3::LteAnr::m_threshold

private

The attribute Threshold.

Definition at line 192 of file lte-anr.h.

Referenced by DoInitialize(), and GetTypeId().

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

src/lte/model/lte-anr.h
src/lte/model/lte-anr.cc

Classes

Public Member Functions

Static Public Member Functions

Protected Member Functions

Private Types

Private Member Functions

Private Attributes

Friends

Additional Inherited Members

Detailed Description

Member Typedef Documentation

◆ NeighbourRelationTable_t

Constructor & Destructor Documentation

◆ LteAnr()

◆ ~LteAnr()

Member Function Documentation

◆ AddNeighbourRelation()

◆ DoAddNeighbourRelation()

◆ DoDispose()

◆ DoGetNoHo()

◆ DoGetNoRemove()

◆ DoGetNoX2()

◆ DoInitialize()

◆ DoReportUeMeas()

◆ Find()

◆ GetLteAnrSapProvider()

◆ GetTypeId()

◆ RemoveNeighbourRelation()

◆ SetLteAnrSapUser()

Friends And Related Symbol Documentation

◆ MemberLteAnrSapProvider< LteAnr >

Member Data Documentation

◆ m_anrSapProvider

◆ m_anrSapUser

◆ m_measId

◆ m_neighbourRelationTable

◆ m_servingCellId

◆ m_threshold