Jonathan Ledy
8
Documents
Présentation
Research Topics
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**Vehicular Adhoc NETworks simulations**
- Propagation models
- Routing protocols
- Cross-layering
- Link-failure prediction
Thesis
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My thesis deals with the optimization of communications in vehicular networks by using a realistic simulation platform. A realistic environment implies the usage of mobility models adapted to vehicles and also highly detailed physical models (channel models and digital transmission chain). The first part of our work has consisted in the design of a realistic simulation platform dedicated to VANETs (Vehicular Ad hoc NETworks). This platform has been completed by a semi-deterministic propagation model which we have designed. This model called UM-CRT has the advantage to have the same level of realism than a deterministic model while requiring much less computation time. This model has been validated by comparison with a deterministic ray tracing simulator. We then have used this platform to evaluate routing protocols. The efficiency of different ad hoc routing protocols in realistic conditions has led us to focus our study on the family of reactive protocols. From this evaluation we have selected AODV (Ad hoc On demand Distance Vector) to which we have applied a cross-layer metric in order to reduce the performance degradation caused by the realistic environment. We then have used a tuning technique with reactive protocols. Finally, we have evaluated several SISO and MIMO physical layers. This work shows that only improvements combined at different levels (physical and network) can yield a significant increase in performance.
Research Topics
---------------
**Vehicular Adhoc NETworks simulations**
- Propagation models
- Routing protocols
- Cross-layering
- Link-failure prediction
Thesis
------
My thesis deals with the optimization of communications in vehicular networks by using a realistic simulation platform. A realistic environment implies the usage of mobility models adapted to vehicles and also highly detailed physical models (channel models and digital transmission chain). The first part of our work has consisted in the design of a realistic simulation platform dedicated to VANETs (Vehicular Ad hoc NETworks). This platform has been completed by a semi-deterministic propagation model which we have designed. This model called UM-CRT has the advantage to have the same level of realism than a deterministic model while requiring much less computation time. This model has been validated by comparison with a deterministic ray tracing simulator. We then have used this platform to evaluate routing protocols. The efficiency of different ad hoc routing protocols in realistic conditions has led us to focus our study on the family of reactive protocols. From this evaluation we have selected AODV (Ad hoc On demand Distance Vector) to which we have applied a cross-layer metric in order to reduce the performance degradation caused by the realistic environment. We then have used a tuning technique with reactive protocols. Finally, we have evaluated several SISO and MIMO physical layers. This work shows that only improvements combined at different levels (physical and network) can yield a significant increase in performance.
Publications
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Impact of realistic simulation on the evaluation of mobile Ad-hoc routing protocolsIEEE Transactions on Emerging Topics in Computing, 2015, 3 (3), pp.317 - 334. ⟨10.1109/TETC.2015.2405478⟩
Article dans une revue
hal-01249106v1
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A Semi-Deterministic ChannelModel for VANETs SimulationsInternational Journal of Vehicular Technology, 2012, pp.1-8. ⟨10.1155/2012/492105⟩
Article dans une revue
hal-00851951v1
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UM-CRT : Un modèle de canal semi-déterministe pour les VANETs17e Journées Nationales Micro-ondes, May 2011, Brest, France. pp.4E-14
Communication dans un congrès
hal-00658995v1
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Realistic wireless communication simulations for VANETSElectronics, Computers and Artificial Intelligence - ECAI 2011 International Conference - 4th Edition, Jun 2011, Piteşti, Romania
Communication dans un congrès
hal-00677391v1
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A survey of V2V channel modeling for VANET simulationsThe 8th International Conference on Wireless On-demand Network Systems and Services - WONS 2011, Jan 2011, Bardonecchia, Italy
Communication dans un congrès
hal-00658989v1
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Impact d'un modèle de propagation réaliste sur un protocole de routage pour les VANETsGDR ONDES et GDR ISIS, Mar 2010, Paris, France
Communication dans un congrès
hal-00658971v1
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A semi-deterministic channel model for VANETs simulationsIntelligent Transport Systems Telecommunications 2010, Nov 2010, Kyoto, Japan. pp.A Semi-Deterministic Channel Model for VANETs Simulations
Communication dans un congrès
hal-00658982v1
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An Enhanced AODV Protocol for VANETs with Realistic Radio Propagation Model ValidationITST 2009, Oct 2009, Lille, France. pp.5
Communication dans un congrès
hal-00476738v1
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