Random waypoint mobility model. More...

#include "random-waypoint-mobility-model.h"

Inheritance diagram for ns3::RandomWaypointMobilityModel:

Collaboration diagram for ns3::RandomWaypointMobilityModel:

Static Public Member Functions
static TypeId	GetTypeId ()
	Register this type with the TypeId system.

Static Public Member Functions inherited from ns3::MobilityModel
static TypeId	GetTypeId ()
	Register this type with the TypeId system.

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	DoInitialize () override
	Initialize() implementation.

Protected Member Functions inherited from ns3::MobilityModel
void	NotifyCourseChange () const
	Must be invoked by subclasses when the course of the position changes to notify course change listeners.

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

virtual void	DoDispose ()
	Destructor implementation.

virtual void	DoInitialize ()
	Initialize() implementation.

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 Member Functions
void	BeginWalk ()
	Get next position, begin moving towards it, schedule future pause event.

int64_t	DoAssignStreams (int64_t) override
	The default implementation does nothing but return the passed-in parameter.

Vector	DoGetPosition () const override

Vector	DoGetVelocity () const override

void	DoInitializePrivate ()
	Begin current pause event, schedule future walk event.

void	DoSetPosition (const Vector &position) override

Private Attributes
EventId	m_event
	event ID of next scheduled event

ConstantVelocityHelper	m_helper
	helper for velocity computations

Ptr< RandomVariableStream >	m_pause
	random variable to generate pauses

Ptr< PositionAllocator >	m_position
	pointer to position allocator

Ptr< RandomVariableStream >	m_speed
	random variable to generate speeds

Additional Inherited Members
Public Types inherited from ns3::MobilityModel
typedef void(*	TracedCallback) (Ptr< const MobilityModel > model)
	TracedCallback signature.

Public Member Functions inherited from ns3::MobilityModel
	MobilityModel ()

	~MobilityModel () override=0

int64_t	AssignStreams (int64_t stream)
	Assign a fixed random variable stream number to the random variables used by this model.

double	GetDistanceFrom (Ptr< const MobilityModel > position) const

Vector	GetPosition () const

Vector	GetPositionWithReference (const Vector &referencePosition) const
	This method may be used if the position returned may depend on some reference position provided.

double	GetRelativeSpeed (Ptr< const MobilityModel > other) const

Vector	GetVelocity () const

void	SetPosition (const Vector &position)

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) 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.

virtual TypeId	GetInstanceTypeId () const =0
	Get the most derived TypeId for this Object.

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.

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

Detailed Description

Random waypoint mobility model.

Each object starts by pausing at time zero for the duration governed by the random variable "Pause". After pausing, the object will pick a new waypoint (via the PositionAllocator) and a new random speed via the random variable "Speed", and will begin moving towards the waypoint at a constant speed. When it reaches the destination, the process starts over (by pausing).

This mobility model enforces no bounding box by itself; the PositionAllocator assigned to this object will bound the movement. If the user fails to provide a pointer to a PositionAllocator to be used to pick waypoints, the simulation program will assert.

The implementation of this model is not 2d-specific. i.e. if you provide a 3d random waypoint position model to this mobility model, the model will still work. There is no 3d position allocator for now but it should be trivial to add one.

Config Paths

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

"/NodeList/[i]/$ns3::MobilityModel/$ns3::RandomWaypointMobilityModel"

Attributes

Pause: A random variable used to pick the pause of a random waypoint model.
- Set with class: ns3::PointerValue
- Underlying type: ns3::Ptr< ns3::RandomVariableStream>
- Initial value: ns3::ConstantRandomVariable[Constant=2.0]
- Flags: constructwriteread
PositionAllocator: The position model used to pick a destination point.
- Set with class: ns3::PointerValue
- Underlying type: ns3::Ptr< ns3::PositionAllocator>
- Initial value: 0
- Flags: constructwriteread
Speed: A random variable used to pick the speed of a random waypoint model.
- Set with class: ns3::PointerValue
- Underlying type: ns3::Ptr< ns3::RandomVariableStream>
- Initial value: ns3::UniformRandomVariable[Min=0.3|Max=0.7]
- Flags: constructwriteread

Attributes defined in parent class ns3::MobilityModel

Position: The current position of the mobility model.
- Set with class: ns3::Vector3DValue
- Underlying type: Vector3D
- Flags: writeread
Velocity: The current velocity of the mobility model.
- Set with class: ns3::Vector3DValue
- Underlying type: Vector3D
- Flags: read

No TraceSources are defined for this type.

TraceSources defined in parent class ns3::MobilityModel

CourseChange: The value of the position and/or velocity vector changed
Callback signature: ns3::MobilityModel::TracedCallback

Size of this type is 184 bytes (on a 64-bit architecture).

Definition at line 53 of file random-waypoint-mobility-model.h.

Member Function Documentation

◆ BeginWalk()

void ns3::RandomWaypointMobilityModel::BeginWalk ( )

private

Get next position, begin moving towards it, schedule future pause event.

Definition at line 63 of file random-waypoint-mobility-model.cc.

References ns3::CalculateDistance(), ns3::EventId::Cancel(), DoInitializePrivate(), ns3::ConstantVelocityHelper::GetCurrentPosition(), ns3::RandomVariableStream::GetValue(), m_event, m_helper, m_position, m_speed, ns3::MobilityModel::NotifyCourseChange(), NS_ASSERT_MSG, ns3::Simulator::Schedule(), ns3::Seconds(), ns3::ConstantVelocityHelper::SetVelocity(), ns3::ConstantVelocityHelper::Unpause(), and ns3::ConstantVelocityHelper::Update().

Referenced by DoInitializePrivate().

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◆ DoAssignStreams()

int64_t ns3::RandomWaypointMobilityModel::DoAssignStreams ( int64_t start )

overrideprivatevirtual

The default implementation does nothing but return the passed-in parameter.

Subclasses using random variables are expected to override this.

Parameters

start starting stream index

Returns: the number of streams used

Reimplemented from ns3::MobilityModel.

Definition at line 123 of file random-waypoint-mobility-model.cc.

References m_pause, m_position, m_speed, NS_ASSERT_MSG, and ns3::RandomVariableStream::SetStream().

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◆ DoGetPosition()

Vector ns3::RandomWaypointMobilityModel::DoGetPosition ( ) const

overrideprivatevirtual

Returns: the current position.

Concrete subclasses of this base class must implement this method.

Implements ns3::MobilityModel.

Definition at line 102 of file random-waypoint-mobility-model.cc.

References ns3::ConstantVelocityHelper::GetCurrentPosition(), m_helper, and ns3::ConstantVelocityHelper::Update().

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◆ DoGetVelocity()

Vector ns3::RandomWaypointMobilityModel::DoGetVelocity ( ) const

overrideprivatevirtual

Returns: the current velocity.

Concrete subclasses of this base class must implement this method.

Implements ns3::MobilityModel.

Definition at line 117 of file random-waypoint-mobility-model.cc.

References ns3::ConstantVelocityHelper::GetVelocity(), and m_helper.

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◆ DoInitialize()

void ns3::RandomWaypointMobilityModel::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 85 of file random-waypoint-mobility-model.cc.

References ns3::Object::DoInitialize(), and DoInitializePrivate().

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