Simple Module MassMobility

File: contrib/mobility/MassMobility.ned

C++ definition: click here

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, changeAngleBy and changeSpeedBy parameters. The parameters described above correspond to the following settings:

changeInterval = normal(5, 0.1)
changeAngleBy = normal(0, 30)
speed = normal(avgSpeed, 0.01)

See also: ChannelControl

Author: Emin Ilker Cetinbas, Andras Varga

Usage diagram:

The following diagram shows usage relationships between modules, networks and channels. Unresolved module (and channel) types are missing from the diagram. Click here to see the full picture.

Parameters:

Name	Type	Description
coreDebug	bool	core MF debug switch
debug	bool	debug switch
x	numeric const	x starting point of the node (-1 = random)
y	numeric const	y starting point of the node (-1 = random)
changeInterval	numeric	frequency of changing speed and angle (can be random) [s]
changeAngleBy	numeric	change angle by this much (can be random) [deg]
speed	numeric	speed (can be random, updated every changeInterval) [m/s]
updateInterval	numeric const	time interval to update the hosts position

Source code:

simple MassMobility
    parameters:
        coreDebug : bool, // core MF debug switch
        debug : bool, // debug switch
        x: numeric const, // x starting point of the node (-1 = random)
        y: numeric const, // y starting point of the node (-1 = random)
        changeInterval: numeric, // frequency of changing speed and angle (can be random) [s]
        changeAngleBy: numeric, // change angle by this much (can be random) [deg]
        speed: numeric, // speed (can be random, updated every changeInterval) [m/s]
        updateInterval : numeric const; // time interval to update the hosts position
endsimple