Gauss-Markov mobility model. More...

#include "gauss-markov-mobility-model.h"

Inheritance diagram for ns3::GaussMarkovMobilityModel:

Collaboration diagram for ns3::GaussMarkovMobilityModel:

Public Member Functions
	GaussMarkovMobilityModel ()

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.

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.

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

void	DoDispose () override
	Destructor implementation.

Vector	DoGetPosition () const override

Vector	DoGetVelocity () const override

void	DoSetPosition (const Vector &position) override

void	DoWalk (Time timeLeft)
	Perform a walk operation.

void	Start ()
	Initialize the model and calculate new velocity, direction, and pitch.

Private Attributes
double	m_alpha
	tunable constant in the model

Box	m_bounds
	bounding box

double	m_Direction
	current direction

EventId	m_event
	event id of scheduled start

ConstantVelocityHelper	m_helper
	constant velocity helper

double	m_meanDirection
	current mean direction

double	m_meanPitch
	current mean pitch

double	m_meanVelocity
	current mean velocity

Ptr< NormalRandomVariable >	m_normalDirection
	Gaussian rv for next direction value.

Ptr< NormalRandomVariable >	m_normalPitch
	Gaussian rv for next pitch.

Ptr< NormalRandomVariable >	m_normalVelocity
	Gaussian rv used to for next velocity.

double	m_Pitch
	current pitch

Ptr< RandomVariableStream >	m_rndMeanDirection
	rv used to assign avg direction

Ptr< RandomVariableStream >	m_rndMeanPitch
	rv used to assign avg.

Ptr< RandomVariableStream >	m_rndMeanVelocity
	rv used to assign avg velocity

Time	m_timeStep
	duraiton after which direction and speed should change

double	m_Velocity
	current velocity

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

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.

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

Gauss-Markov mobility model.

This is a 3D version of the Gauss-Markov mobility model described in [1]. Unlike the other mobility models in ns-3, which are memoryless, the Gauss Markov model has both memory and variability. The tunable alpha parameter determines the how much memory and randomness you want to model. Each object starts with a specific velocity, direction (radians), and pitch angle (radians) equivalent to the mean velocity, direction, and pitch. At each timestep, a new velocity, direction, and pitch angle are generated based upon the previous value, the mean value, and a gaussian random variable. This version is suited for simple airplane flight, where direction, velocity, and pitch are the key variables. The motion field is limited by a 3D bounding box (called "box") which is a 3D version of the "rectangle" field that is used in 2-dimensional ns-3 mobility models.

Here is an example of how to implement the model and set the initial node positions:

MobilityHelper mobility;
 
mobility.SetMobilityModel ("ns3::GaussMarkovMobilityModel",
  "Bounds", BoxValue (Box (0, 150000, 0, 150000, 0, 10000)),
  "TimeStep", TimeValue (Seconds (0.5)),
  "Alpha", DoubleValue (0.85),
  "MeanVelocity", StringValue ("ns3::UniformRandomVariable[Min=800|Max=1200]"),
  "MeanDirection", StringValue ("ns3::UniformRandomVariable[Min=0|Max=6.283185307]"),
  "MeanPitch", StringValue ("ns3::UniformRandomVariable[Min=0.05|Max=0.05]"),
  "NormalVelocity", StringValue ("ns3::NormalRandomVariable[Mean=0.0|Variance=0.0|Bound=0.0]"),
  "NormalDirection", StringValue ("ns3::NormalRandomVariable[Mean=0.0|Variance=0.2|Bound=0.4]"),
  "NormalPitch", StringValue ("ns3::NormalRandomVariable[Mean=0.0|Variance=0.02|Bound=0.04]"));
 
mobility.SetPositionAllocator ("ns3::RandomBoxPositionAllocator",
  "X", StringValue ("ns3::UniformRandomVariable[Min=0|Max=150000]"),
  "Y", StringValue ("ns3::UniformRandomVariable[Min=0|Max=150000]"),
  "Z", StringValue ("ns3::UniformRandomVariable[Min=0|Max=10000]"));
 
mobility.Install (wifiStaNodes);

[1] Tracy Camp, Jeff Boleng, Vanessa Davies, "A Survey of Mobility Models for Ad Hoc Network Research", Wireless Communications and Mobile Computing, Wiley, vol.2 iss.5, September 2002, pp.483-502

Config Paths

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

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

Attributes

Alpha: A constant representing the tunable parameter in the Gauss-Markov model.
- Set with class: ns3::DoubleValue
- Underlying type: double -1.79769e+308:1.79769e+308
- Initial value: 1
- Flags: constructwriteread
Bounds: Bounds of the area to cruise.
- Set with class: ns3::BoxValue
- Underlying type: Box
- Initial value: -100|100|-100|100|0|100
- Flags: constructwriteread
MeanDirection: A random variable used to assign the average direction.
- Set with class: ns3::PointerValue
- Underlying type: ns3::Ptr< ns3::RandomVariableStream>
- Initial value: ns3::UniformRandomVariable[Min=0.0|Max=6.283185307]
- Flags: constructwriteread
MeanPitch: A random variable used to assign the average pitch.
- Set with class: ns3::PointerValue
- Underlying type: ns3::Ptr< ns3::RandomVariableStream>
- Initial value: ns3::ConstantRandomVariable[Constant=0.0]
- Flags: constructwriteread
MeanVelocity: A random variable used to assign the average velocity.
- Set with class: ns3::PointerValue
- Underlying type: ns3::Ptr< ns3::RandomVariableStream>
- Initial value: ns3::UniformRandomVariable[Min=0.0|Max=1.0]
- Flags: constructwriteread
NormalDirection: A gaussian random variable used to calculate the next direction value.
- Set with class: ns3::PointerValue
- Underlying type: ns3::Ptr< ns3::NormalRandomVariable>
- Initial value: ns3::NormalRandomVariable[Mean=0.0|Variance=1.0|Bound=10.0]
- Flags: constructwriteread
NormalPitch: A gaussian random variable used to calculate the next pitch value.
- Set with class: ns3::PointerValue
- Underlying type: ns3::Ptr< ns3::NormalRandomVariable>
- Initial value: ns3::NormalRandomVariable[Mean=0.0|Variance=1.0|Bound=10.0]
- Flags: constructwriteread
NormalVelocity: A gaussian random variable used to calculate the next velocity value.
- Set with class: ns3::PointerValue
- Underlying type: ns3::Ptr< ns3::NormalRandomVariable>
- Initial value: ns3::NormalRandomVariable[Mean=0.0|Variance=1.0|Bound=10.0]
- Flags: constructwriteread
TimeStep: Change current direction and speed after moving for this time.
- Set with class: ns3::TimeValue
- Underlying type: Time +9.22337e+18ns:+9.22337e+18ns
- Initial value: +1e+09ns
- 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 320 bytes (on a 64-bit architecture).

Definition at line 81 of file gauss-markov-mobility-model.h.

Constructor & Destructor Documentation

◆ GaussMarkovMobilityModel()

ns3::GaussMarkovMobilityModel::GaussMarkovMobilityModel ( )

Definition at line 97 of file gauss-markov-mobility-model.cc.

References m_event, m_helper, m_meanDirection, m_meanPitch, m_meanVelocity, ns3::Simulator::ScheduleNow(), Start(), and ns3::ConstantVelocityHelper::Unpause().

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Member Function Documentation

◆ DoAssignStreams()

int64_t ns3::GaussMarkovMobilityModel::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 238 of file gauss-markov-mobility-model.cc.

References m_normalDirection, m_normalPitch, m_normalVelocity, m_rndMeanDirection, m_rndMeanPitch, m_rndMeanVelocity, and ns3::RandomVariableStream::SetStream().

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◆ DoDispose()

void ns3::GaussMarkovMobilityModel::DoDispose ( )

overrideprivatevirtual

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 210 of file gauss-markov-mobility-model.cc.

References ns3::Object::DoDispose().

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