Jemula802
Jemula 802
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This project requires jemula as kernel.
Overview
Jemula 802 is a tool for simulating IEEE 802.11 wireless networks. It is also capable of simulating WIFI mesh networks as in the 802.11s draft. This page gives a general overview of the tool. If you are interested in using it, you can read the user guide.
Simulator
The tool is written in Java and has an event-based architecture. The connectivity model used is a unit disk model which means that whenever a station is inside a specified radius of another, the stations have a perfect, error free connection, outside this radius the stations are not connected. Simulations are configured using an XML file. In this XML file it is possible to specify values for almost every parameter in the system. The configuration parameters of the MAC layer are configurable separately for each station.
The results of the simulation currently include throughput (end to end and per hop), offered throughput and delay (end to end and per hop).
GUI
Jemula provides a GUI to visualize packet traffic among stations. It displays the timeline of packet traffic for each station. Additionally it displays network allocation vectors and backoff times for each station. Here a screen shot of the GUI:
Editor
The tool also comes with an editor for creating and editing scenarios. The editor allows to place stations on a map and connect them by mouse, additionally all the different MAC parameters can be configured for each station. For creating bigger scenarios, the editor provides functionality to create lines, grids and circles of stations. You can also select groups of stations to move, rotate or scale them. The following picture is a screenshot of the editors user interface.
Animation
Another type of visualization is the Google Earth animation of a scenario. In contrast to the packet accurate GUI, it provides visualization of aggregated throughput and averaged delay. The animation illustrates the throughput/delay per station or per link. It also displays the ratio between offered throughput and action throughput (red and blue blocks).
The next picture shows the animation of a queueing scenario. Red link means a lot of throughput, a green link means low throughput.
The code is well tested and should work without problems. Since it is prepared to work with real-time systems, we prefer to refer to it as an "emulator" instead of just a plain simulator. The tool is published as is under a BSD free software license.
| Attachment | Size |
|---|---|
| Editor.png | 792.99 KB |
| JemulaGui.JPG | 195.52 KB |
| QueueAnimation.JPG | 292.66 KB |
