Table Of Contents

Measuring Packet Delay Variation

Goals

In this example we explore the various packet delay variation (also known as packet jitter) statistics of application modules.

INET version: 4.4

Source files location: inet/showcases/measurement/jitter

The Model

The packet delay variation is measured in several different forms:

• Instantaneous packet delay variation: the difference between the packet delay of successive packets (packetJitter statistic)

• Variance of packet delay (packetDelayVariation statistic)

• Packet delay difference compared to the mean value (packetDelayDifferenceToMean statistic)

Here is the network:

Here is the configuration:

[General]
network = JitterMeasurementShowcase
sim-time-limit = 5s

# source application ~96Mbps throughput
*.source.numApps = 1
*.source.app[0].typename = "UdpSourceApp"
*.source.app[0].source.packetLength = 1200B
*.source.app[0].source.productionInterval = exponential(100us)
*.source.app[0].io.destAddress = "destination"
*.source.app[0].io.destPort = 1000

# destination application
*.destination.numApps = 1
*.destination.app[0].typename = "UdpSinkApp"
*.destination.app[0].io.localPort = 1000

Results

Here are the results:

Sources: omnetpp.ini, JitterMeasurementShowcase.ned

Try It Yourself

If you already have INET and OMNeT++ installed, start the IDE by typing omnetpp, import the INET project into the IDE, then navigate to the inet/showcases/measurement/jitter folder in the Project Explorer. There, you can view and edit the showcase files, run simulations, and analyze results.

Otherwise, there is an easy way to install INET and OMNeT++ using opp_env, and run the simulation interactively. Ensure that opp_env is installed on your system, then execute:

$ opp_env run inet-4.4 --init -w inet-workspace --install --chdir \
   -c 'cd inet-4.4.*/showcases/measurement/jitter && inet'

This command creates an inet-workspace directory, installs the appropriate versions of INET and OMNeT++ within it, and launches the inet command in the showcase directory for interactive simulation.

Alternatively, for a more hands-on experience, you can first set up the workspace and then open an interactive shell:

$ opp_env install --init -w inet-workspace inet-4.4
$ cd inet-workspace
$ opp_env shell

Inside the shell, start the IDE by typing omnetpp, import the INET project, then start exploring.

Discussion

Use this page in the GitHub issue tracker for commenting on this showcase.

Table Of Contents

• Measuring Packet Delay Variation
  • Goals
  • The Model
  • Results
  • Try It Yourself
  • Discussion

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