towards standardized channel models for short-range vehicular communications. david g. michelson*,...
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Towards Standardized Channel Models for Short-range Vehicular Communications.
David G. Michelson*, David Matolak**, John Wang*, and Alexander Corbett*
*University of British Columbia, Dept. of Electrical and Computer Engineering, Vancouver, BC, Canada
**Ohio University, School of Electrical Engineering and Computer ScienceAthens, OH, USA
Why are standardized channel models important?
• Channel models capture our knowledge and understanding of the manner in which propagation impairments manifest themselves in a particular environment in a form useful in design and simulation.
• Standardized channel models permit fair comparison of alternative PHY, MAC and network layer schemes across a representative range of channel conditions.
How are standardized channel models developed?
• A channel modeling committee works with PHY. MAC and network developers to determine:- the channel impairments to which the proposed PHY,
MAC and network layer schemes are likely sensitive, and,
- the range of environments and scenarios within which the proposed systems will likely be delpoyed
• The channel modelling committee reviews the published literature and identifies relevant works.
- If the published works are inadequate, the committee may put out a call for submissions based upon work either recently completed or in progress
• The committee proposes and evaluates alternative forms for the standardized channel models based upon a tradeoff between model accuracy, computation efficiency and the cost and availability of increasing levels of detail concerning the environment.
• The committee recommends parameters for the standardized channel models based upon results presented in published works and recent submissions.
• The committee may recommend test suites that permit implementations of the standardized channel models to be validated.
• The committee releases a channel modelling report that summarizes the results of their work in order to provide guidance to system designers and simulation tool developers.
Vehicle Unit
Roadside Unit 1
What are some common VANET (Vehicular Ad hoc NETwork) simulation tools?
• NS-2
• GloMoSim
• OMNeT++
• JiST/SWANS
Are standardized channel models available for short-range vehicular networks?
• No. As a result,
- simulation tool developers must use their own best judgement when selecting or implementing channel models
- there are significant differences between the channel models incorporated into today’s VANET simulation tools and
- fair comparison between results obtained using different simulation tools is difficult.
How is the IEEE VT-S Propagation Committee proceeding to develop standardized channel models for short-range vehicular networks?
• The Short-Range Vehicular Channel Modelling Initiative will be launched at IEEE VTC Fall 2011.
• The VANET community will be engaged at other events such as the 2011 NSERC DIVA Workshop and the IEEE ICC 2012 Workskop on Intelligent Vehicular Networking.
• VANET simulation tool developers will be engaged directly and their feedback sought.
• The results will be released at a special session or workshop at IEEE VTC Fall 2012.
How will a given simulation tool’s compliance be verified?
• A test suite will be released that will allow a given simulator’s compliance with the channel modelling standard to be verified.
• A compliant simulation tool will be allowed to display a logo that shows that it is compliant with the IEEE VT-S standardized short-range vehicular channel model.
Will compliance require that the developer exclude alternative channel models models?
• No. Compliant simulators will be encouraged to implement alternative channel models but must provide a simple method for invoking the IEEE VT-S standardized channel models.
• TraNS• OPNET Modeler
• QualNet
• J-Sim