ikr.simlib.distributions.continuous.statedep

Class VideoSourceDistribution

java.lang.Object

ikr.simlib.distributions.Distribution

ikr.simlib.distributions.continuous.ContinuousDistribution

ikr.simlib.distributions.continuous.statedep.VideoSourceDistribution

All Implemented Interfaces:

ReflectionConstructable, ReflectionConstructable3<SimNode,Parameters,RandomNumberGenerator>

public class VideoSourceDistribution
extends ContinuousDistribution

Video Source

Meaning:	Modeling of video sources in ATM/packet networks
Description:	Parameters: frame duration \(d_F\), frame size \(s_F\), packet size \(s_P\) Autoregressive process with the bit rate \(\lambda_i\) in frame \(i\) in bits/pixel: \(\lambda_i = (a \cdot \lambda_{i-1} + b \cdot \varepsilon) \cdot r(0,\lambda_{max})\) with the constants \(a\) and \(b\) as well as the function \(r\) to limit the rate to the interval \([0,\lambda_max]\). Usually normal distribution for \(\varepsilon\)
Parameters:	frame size \(s_F\) frame duration \(d_F\) start rate \(\lambda_0\) constants \(a\) and \(b\) maximum rate \(\lambda_{max}\) distribution \(\varepsilon\) packet size \(s_P\)
Characteristic values:	Average packet intervals within the frame \(i: E[T] = \frac{s_P \cdot d_F}{s_F \cdot \lambda_i}\)
Parser example:	[...].dist = VideoSourceDistribution [...].dist.StartRate = 0.5333333 # bits/pixel [...].dist.UpperlimitRate = 1.0666667 # max. bits/pixel [...].dist.RateDistribution = Normal [...].dist.RateDistribution.Mean = 0.587 # bits/pixel [...].dist.RateDistribution.StandardDeviation = 1 [...].dist.FrameDuration = 33333 # inter-picture time [...].dist.FrameSize = 250000 # 250 000 pixel/picture [...].dist.PacketSize = 384 # ATM cell 48 * 8 bits [...].dist.ConstantA = 0.8781 # factor for last rate [...].dist.ConstantB = 0.1108 # factor for new rate
References:	W. Held, 2. Semesterarbeit (950) B. Maglaris et al., Performance Models of Statistical Multiplexing in Packet Video Communications, IEEE Transactions on Communications, Vol.36, No. 7, 07/88

Field Summary

Fields

Modifier and Type	Field and Description
double	constantA e.g.
double	constantB e.g.
double	frameDuration e.g.
int	frameSize e.g.
int	packetSize e.g.
ContinuousDistribution	rateDistribution e.g.
double	startRate e.g.
double	upperLimitRate e.g.

Fields inherited from class ikr.simlib.distributions.Distribution

rng

Fields inherited from interface ikr.simlib.parameters.reflection.ReflectionConstructable

CREATE_INSTANCE_METHOD_NAME

Constructor Summary

Constructors

Constructor and Description
VideoSourceDistribution(int framesize, double frameduration, double startrate, double constanta, double constantb, double upperlimitrate, ContinuousDistribution ratedistribution, int packetsize)
VideoSourceDistribution(int framesize, double frameduration, double startrate, double constanta, double constantb, double upperlimitrate, ContinuousDistribution ratedistribution, int packetsize, RandomNumberGenerator rng)

Method Summary

Methods

Modifier and Type	Method and Description
static VideoSourceDistribution	createInstance(SimNode ownNode, Parameters pars, RandomNumberGenerator rng) as required by ReflectionConstructable
int	generatePackets()
double	getActRate()
int	getFrameCounter()
int	getPacketCounter()
double	getVideoInterCellTime()
double	next() Create random numbers
void	reset() The default behavior is to do nothing.

Methods inherited from class ikr.simlib.distributions.Distribution

getDefaultRNG, getRandomNumberGenerator

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

frameSize

public final int frameSize

e.g. 250000 pixels/picture

frameDuration

public final double frameDuration

e.g. 33333 us -> 30 pictures/sec

startRate

public final double startRate

e.g. 0.52 bits/pixel

constantA

public final double constantA

e.g. 0.8781

constantB

public final double constantB

e.g. 0.1108

upperLimitRate

public final double upperLimitRate

e.g. 1.41 bits/pixel

rateDistribution

public final ContinuousDistribution rateDistribution

e.g. normal distribution with mean 0.572 bits/pixel

packetSize

public final int packetSize

e.g. 384 bits/cell

Constructor Detail

VideoSourceDistribution

public VideoSourceDistribution(int framesize,
                       double frameduration,
                       double startrate,
                       double constanta,
                       double constantb,
                       double upperlimitrate,
                       ContinuousDistribution ratedistribution,
                       int packetsize,
                       RandomNumberGenerator rng)

VideoSourceDistribution

public VideoSourceDistribution(int framesize,
                       double frameduration,
                       double startrate,
                       double constanta,
                       double constantb,
                       double upperlimitrate,
                       ContinuousDistribution ratedistribution,
                       int packetsize)

Method Detail

createInstance

public static VideoSourceDistribution createInstance(SimNode ownNode,
                                     Parameters pars,
                                     RandomNumberGenerator rng)

as required by ReflectionConstructable

generatePackets

public int generatePackets()

next

public double next()

Description copied from class: ContinuousDistribution

Create random numbers

Specified by:

next in class ContinuousDistribution

reset

public void reset()

Description copied from class: Distribution

The default behavior is to do nothing. Some state dependent distributions override the function

Overrides:

reset in class Distribution

getActRate

public double getActRate()

getFrameCounter

public int getFrameCounter()

getPacketCounter

public int getPacketCounter()

getVideoInterCellTime

public double getVideoInterCellTime()