News and announcements

LTE and WiMedia Modules Published

Written for openWNS by Maciej Muehleisen on 2010-12-30

An IMT-Advanced evaluation compliant LTE simulator module has been released together with an example configuration and tutorial on how to evaluate performance in the IMT-Advanced Indoor Hotspot scenario. Among others the following aspects are implemented:

- FDD configuration with scalable bandwidth from 1.4 MHz to 20 MHz
- Channel state estimation (CQI) and dynamic rate adaptation
- Configurable radio resource scheduling algorithms (default set to RoundRobin as specified in 3GPP baseline configuration)
- IMT-Advanced compliant channel model (ITU-R document M.2135)

Also an ECMA-368 (WiMedia) simulation module was released with following characteristic:

The ECMA-368 standard, also known as the WiMedia standard is partly implemented into the WiMeMac module. This module uses the OpenWNS framework and focuses on selected properties of the medium access protocols conform to ECMA-368, mainly:

The Distributed Reservation Protocol (DRP)

- DRP Negotiation (on demand)
- DRP Conflict Resolution
- Blocked or Random Reservation (number of blocks in DTP can be configured)

Prioritized Contention Access (PCA)

Beacon Protocol (partly implemented, negotiation by using Information Elements(IE))

Rate Adaptation (based on estimated and targeted Frame Error Rate (FER))

The ultra wideband (UWB) channel characteristics are considered by a data link level (DLL) mapping, taking also certain aspects of WiMedia’s channel coding into account, different Channel Models from IEEE 802.15.3 Task Group are selectable. The physical layer (PHY) in use is based on the OpenWNS Radio Interference Simulation Engine (RISE), which is parametrized on UWB bandwidth.

openWNS Summer School 27. - 29.09.2010

Written for openWNS by Maciej Muehleisen on 2010-06-17

from September 27th until September 29th

at the facilities of ComNets Research Group

Prof. Dr.-Ing. Bernhard Walke

RWTH Aachen University.

=== THEME ===

Besides field testing and mathematical analysis, simulation has become a key method in many research areas, including communication networks. Multiple simulation tools exist with different degrees of detail. System level network simulators aim to evaluate the performance of communication technologies in realistic multi-cellular system deployments. The Open Source Wireless Network Simulator (openWNS) is a system level simulator developed especially to analyze and improve wireless networks. It has been developed by the ComNets Research Group, which has almost 20 years of experience with wireless network modelling and simulation. The simulator has been published as open source under the Lesser General Public License (LGPL) allowing non-profit as well as commercial use of it for everybody who is interested.


The first ComNets openWNS Summer School is intended to bring people using openWNS together to exchange knowledge, share their experience and discuss problems. This way we hope to form a vivid network of openWNS developers willing to support each others work in an overall open source project. Tutorials will be held to introduce new, advanced functionalities of the simulator, including the IMT-Advanced Evaluation framework.

The event is intended for people already using openWNS, including those with a high level of experience and those that have just started work on this tool. Participants should have a long-term interest in further using the simulator. People who have not yet used the simulator have the opportunity to complete beginners tutorials available ( before attending the event.

=== TOPICS ===

The following topics will be covered during the event. The actual weighting of the topics depend on the wishes and research interests of the participants:

 * The openWNS tool chain: develop, test & validate, simulate, gather results
 * The system independent IMT-Advanced Evaluation framework
 * IMT-Advanced candidate system simulator modules LTE and IEEE 802.16m WiMAX
 * Capabilities and setup of the probing system
 * The Functional Unit concept
 * The development cycle of the open source project

The event will include presentations, discussions and hands-on tutorials on the topics.


Participants are encouraged to share their experiences with the simulator. Presentations of approximately 15 min. duration are welcome. Please contact us if you wish to give a presentation.

=== LOCATION ===

The event takes place at the facilities of the ComNets Research Group at RWTH Aachen University. Address: Bernhard-Walke-Haus; Kopernikusstr. 5; 52074 Aachen, Germany. Please refer to our homepage for directions.


Prospective participants should apply by email to before July 31, 2010. Participation is free of charge but does not include room and board. As an extra all participants receive an exclusive pre-release version of the currently unpublished LTE simulator module. The number of participants is limited to a maximum of 20. If we receive more applications, participants will be selected based on their work area and background, geographic distribution, and date of application. Acceptance notifications will be sent by August 15.

=== CONTACT ===

Maciej Muehleisen mue@comnets.rwth-aachen

Daniel Bueltmann

Sebastian Max

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Improved WiMAX module, IMT-Advanced support, openWNS USB sticks

Written for openWNS by Maciej Muehleisen on 2010-06-11

Another major update of the RWTH Aachen University Open Source Wireless Network Simulator (openWNS) was uploaded to Launchpad. As promised, the IEEE 802.16 WiMAX module "WiMAC" was further enhanced and can now be used in IMT-Advanced compliant evaluation scenarios. Additionally openWNS is now also available on bootable USB sticks.

WiMAX module:

The IEEE 802.16 WiMAX simulator module "WiMAC" is now also capable to support OFDMA. Currently a configuration with scalable bandwidth between 5 MHz and 20 MHz, 1/8 cyclic prefix and Time Division Duplex (TDD) is available. A first test configuration for beamforming and Space Division Multiple Access (SDMA) has also been published.

IMT-Advanced Evaluation:

IMT-Advanced Evaluation Methodology compliant scenarios for Urban Macro, Urban Micro, Rural Macro, Suburban Macro and Indoor Hotspot deployment scenarios have been published to evaluate WiMAX system performance. The scenario setup includes the node deployment, large-scale fading channel model, antenna characteristics and transceiver properties.

openWNS on USB:

We were able to create a fully functional openWNS installation on a bootable USB stick. Go to to download a copy. The minimum requirement is an empty USB stick with at least 8GB capacity. Everything needed to get to know the simulator by completing the openWNS tutorial is already set up.

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openWNS-Paper received Best Paper Award at SIMUTools 2010

Written for openWNS by Sebastian Max on 2010-04-01

The programme committee of this year's SIMUTools 2010 - the 3rd Intl.
ICST Conference on Simulation Tools and Techniques - decided to award
the best paper award to our paper entitled "Evaluation of IMT-Advanced
Scenarios using the open Wireless Network Simulator."

The paper contains an all-in-one overview of the openWNS, the FUN
framework, how the FUN is applied to implement the WiFiMAC and how the
simulator is used to evaluate IMT-Advanced scenarios.

The paper can be downloaded here:

If you are publishing results generated with the WiFiMAC, please cite
this paper (Bibtex entry is available at the mentioned URL). If you are
publishing results generated with the openWNS, but not the WiFiMAC,
please cite any of our papers.

Your openWNS developers team.

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Major Update Including IMT-Advanced Evaluation Support

Written for openWNS by Maciej Muehleisen on 2010-02-01

Today, a major update of the RWTH Aachen University Open Source Wireless Network Simulator (openWNS) was uploaded to Launchpad. The WiMAX module has been completely refactored, MIMO models for IEEE 802.11 Draft N have been included and scenario setups as needed for IMT-Advanced evaluations can now be used for all modules. In detail the update includes:

WiMAX module:

The module was completely refactored. It was prepared to support OFDMA and is currently being parameterized for IEEE 802.16e and m frame configurations. The current example configuration uses 10ms frame duration and 100 time slots on a single subchannel.

MIMO / WiFi:

DLL to PHY layer interface was adjusted to support MIMO. This is currently used in the WiFi module DraftN configuration.

Scenario Builder:

A scenario builder framework was created supporting common tasks like base station and user terminal placement, antenna configuration, and traffic setup. An example configuration can be found in the OFDMA-Scanner System Tests

Radio Interference Simulation Engine (RISE):

IMT-Advanced evaluation methodology path-loss and shadowing models for Indoor Hotspot, Urban Micro, Urban Macro, Rural Macro and Suburban Macro are now included.


bin/pytree has been improved generating HTML output. It can now be called without the previously required path arguments with the config file as the only argument. It can be used to visualize the node placement if used with the new Scenario Builder.

Please refer to for more details on how to
download or update openWNS.

Your openWNS developers team

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