Network Simulation – Case Studies
Contents:
The Celtic BOSS Project (Railway on-board wireless secured video surveillance)
The purpose of the BOSS project was the design and prototype development of an efficient railway communication system. This system was aimed to support the high demands of an audio/video surveillance system in a rolling train from a control center on the wayside, and also to address related issues, such as predictive maintenance. The system is based on WiMAX/HSUPA (outdoors, towards the control center) and WiFi (indoors) networks.
The functional architecture had been developed into a full communication architecture as an OMNeT++ simulation model. The model was enriched through the project lifetime by the modules and algorithms developed within the project's technical packages on radio communications, signalling, adaptation to impairments, efficient multimedia compression, and abnormal events detection.
"The OMNeT++ simulator was a key element to ensure firstly validation of the system before prototyping, secondly establishment of initial working settings for the demonstration phase, and thirdly measurement and assessment of techniques that will not be realistically implantable in the BOSS demonstrator," they write.
The BOSS consortium consists of THALES Communications France, Alstom-Transport, SNCF, INRETS, UPMC (France), UCL, BARCO-SILEX (Belgium), TELEFONICA I+D, Arteixo-Telecom, INECO (Spain), BME, E-GROUP (Hungary).
Read the full article in the November 2008 issue of Celtic News (pdf).
A video demonstration of the BOSS project (unfortunately without the simulation) can be viewed here.
Detailed Cross-Layer Simulator for Content Transmission over Wireless Ad-Hoc Networks
(figure from the paper; click to enlarge)
Thales Group researchers Raphaël Massin and his colleagues developed a OMNeT++-based simulation framework to enable the study of data and multimedia content transmission over hybrid wired/wireless ad-hoc networks, as well as the design of innovative radio accesss schemes. To achieve this goal, the complete protocol stack from the application to the physical layer is simulated, and the real bits and bytes of the messages transferred on the radio channel are exchanged. To ensure that this framework was reusable and extensible in future studies and projects, a modular software and protocol architecture was defined, using facilities provided by OMNeT++. The work has already provided valuable results concerning cross-layer HARQ/MAC protocol performance and video transmission over the wireless channel.
R. Massin, C. Lamy-Bergot, C. J. Le Martret, and R. Fracchia (Thales Communications), 2010. "OMNeT++-Based Cross-Layer Simulator for Content Transmission over Wireless Ad Hoc Networks." EURASIP Journal on Wireless Communications and Networking, vol. 2010, Article ID 502549. doi:10.1155/2010/502549
Simulation Study of IEEE 802.15.4 LR-WPAN for Industrial Applications
The IEEE 802.15.4 protocol has become the primary solution for many Low-Rate Wireless Personal Area Network (LR-WPAN) applications. This is especially the case for industrial sensor network applications such as automation control. Researchers from Siemens and University of Erlangen-Nuremberg performed a series of OMNeT++-based simulation experiments that contribute to a better understanding of IEEE 802.15.4 behavior. The results outline the capabilities of this protocol in the selected scenarios, and also the limitations. They investigated the dependency of the protocol on protocol-inherent parameters such as the beacon order and the superframe order, and also to different traffic load. The results can be used for planning and deploying IEEE 802.15.4 based sensor networks with specific performance demands. A special focus was put on application scenarios in industrial sensor network applications. The primary requirements were reduced end-to-end latency and energy consumption. The results were obtained with the authors' new implementation of IEEE 802.15.4 developed for OMNeT++.
Feng Chen, Nan Wang, Reinhard German and Falko Dressler, 2010. "Simulation study of IEEE 802.15.4 LR-WPAN for industrial applications." Wiley Wireless Communications and Mobile Computing (WCMC), vol. 10 (5), pp. 609-621, May 2010.
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You can find more accounts on research done with OMNeT++ in papers in the omnetpp.org publications database.
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