Package: inet.mobility.single
MassMobility
simple moduleThis is a random mobility model for a mobile host with a mass. It is the one used in "Optimized Smooth Handoffs in Mobile IP" by Perkins &Wang.
"An MH moves within the room according to the following pattern. It moves along a straight line for a certain period of time before it makes a turn. This moving period is a random number, normally distributed with average of 5 seconds and standard deviation of 0.1 second. When it makes a turn, the new direction (angle) in which it will move is a normally distributed random number with average equal to the previous direction and standard deviation of 30 degrees. Its speed is also a normally distributed random number, with a controlled average, ranging from 0.1 to 0.45 (unit/sec), and standard deviation of 0.01 (unit/sec). A new such random number is picked as its speed when it makes a turn. This pattern of mobility is intended to model node movement during which the nodes have momentum, and thus do not start, stop, or turn abruptly. When it hits a wall, it reflects off the wall at the same angle; in our simulated world, there is little other choice."
This implementation can be parameterized a bit more, via the changeInterval and angleDelta parameters. The parameters described above correspond to the following settings:
 changeInterval = normal(5, 0.1)
 angleDelta = normal(0, 30)
 speed = normal(avgSpeed, 0.01)
3D (spatial movement) is also supported using rotationAxisAngle parameter.
Author: Emin Ilker Cetinbas, Andras Varga
Inheritance diagram
The following diagram shows inheritance relationships for this type. Unresolved types are missing from the diagram.
Extends
Name  Type  Description 

MovingMobilityBase  simple module 
Abstract base module for mobility models. 
Parameters
Name  Type  Default value  Description 

subjectModule  string  "^" 
module path which determines the subject module, the motion of which this mobility model describes, the default value is the parent module 
coordinateSystemModule  string  "" 
module path of the geographic coordinate system module 
displayStringTextFormat  string  "p: %p\nv: %v" 
format string for the mobility module's display string text 
updateDisplayString  bool  true 
enables continuous update of the subject module's position via modifying its display string 
constraintAreaMinX  double  inf m 
min x position of the constraint area, unconstrained by default (negative infinity) 
constraintAreaMinY  double  inf m 
min y position of the constraint area, unconstrained by default (negative infinity) 
constraintAreaMinZ  double  inf m 
min z position of the constraint area, unconstrained by default (negative infinity) 
constraintAreaMaxX  double  inf m 
max x position of the constraint area, unconstrained by default (positive infinity) 
constraintAreaMaxY  double  inf m 
max y position of the constraint area, unconstrained by default (positive infinity) 
constraintAreaMaxZ  double  inf m 
max z position of the constraint area, unconstrained by default (positive infinity) 
updateInterval  double  0.1s 
the simulation time interval used to regularly signal mobility state changes and update the display 
faceForward  bool  true  
initialX  double  uniform(constraintAreaMinX, constraintAreaMaxX)  
initialY  double  uniform(constraintAreaMinY, constraintAreaMaxY)  
initialZ  double  nanToZero(uniform(constraintAreaMinZ, constraintAreaMaxZ))  
initialMovementHeading  double  uniform(0deg, 360deg) 
initial heading 
initialMovementElevation  double  0deg 
initial elevation 
initFromDisplayString  bool  true 
enables one time initialization from the subject module's display string 
changeInterval  double 
frequency of changing speed and angle (can be random) 

angleDelta  double 
rotate velocity vector by this much around the rotation axis defined by the rotationAxisAngle parameter (can be random) 

rotationAxisAngle  double  0deg 
defines a vector in the plane perpendicular to the velocity, where 0 deg means the Z axis when bank is zero (can be random) 
speed  double 
speed (can be random, updated every changeInterval) 
Properties
Name  Value  Description 

display  i=block/cogwheel  
class  MassMobility 
Signals
Name  Type  Unit 

mobilityStateChanged  inet::MobilityBase 
Source code
// // This is a random mobility model for a mobile host with a mass. It is the // one used in "Optimized Smooth Handoffs in Mobile IP" by Perkins &Wang. // // "An MH moves within the room according to the following pattern. It moves // along a straight line for a certain period of time before it makes a turn. // This moving period is a random number, normally distributed with average of // 5 seconds and standard deviation of 0.1 second. When it makes a turn, the // new direction (angle) in which it will move is a normally distributed // random number with average equal to the previous direction and standard // deviation of 30 degrees. Its speed is also a normally distributed random // number, with a controlled average, ranging from 0.1 to 0.45 (unit/sec), and // standard deviation of 0.01 (unit/sec). A new such random number is picked // as its speed when it makes a turn. This pattern of mobility is intended to // model node movement during which the nodes have momentum, and thus do not // start, stop, or turn abruptly. When it hits a wall, it reflects off the // wall at the same angle; in our simulated world, there is little other // choice." // // This implementation can be parameterized a bit more, via the changeInterval // and angleDelta parameters. The parameters described above // correspond to the following settings: //  changeInterval = normal(5, 0.1) //  angleDelta = normal(0, 30) //  speed = normal(avgSpeed, 0.01) // // 3D (spatial movement) is also supported using rotationAxisAngle parameter. // // @author Emin Ilker Cetinbas, Andras Varga // simple MassMobility extends MovingMobilityBase { parameters: double initialX @unit(m) = default(uniform(constraintAreaMinX, constraintAreaMaxX)); double initialY @unit(m) = default(uniform(constraintAreaMinY, constraintAreaMaxY)); double initialZ @unit(m) = default(nanToZero(uniform(constraintAreaMinZ, constraintAreaMaxZ))); double initialMovementHeading @unit(deg) = default(uniform(0deg, 360deg)); // initial heading double initialMovementElevation @unit(deg) = default(0deg); // initial elevation bool initFromDisplayString = default(true); // enables one time initialization from the subject module's display string volatile double changeInterval @unit(s); // frequency of changing speed and angle (can be random) volatile double angleDelta @unit(deg); // rotate velocity vector by this much around the rotation axis defined by the rotationAxisAngle parameter (can be random) volatile double rotationAxisAngle @unit(deg) = default(0deg); // defines a vector in the plane perpendicular to the velocity, where 0 deg means the Z axis when bank is zero (can be random) volatile double speed @unit(mps); // speed (can be random, updated every changeInterval) @class(MassMobility); }File: src/inet/mobility/single/MassMobility.ned