Vehicular communications critically depend on several simultaneous events, spanning from mobility to protocol mechanisms and wireless, physical phenomena. All of them have been demonstrated to have different but heavy impact on packet statistics. Despite this, only some of them are properly modeled within the available network simulation platforms. Most importantly current protocol simulations do not take into account environmental constraints. Some effects are considered by statistical models (such as Nakagami model), other ones - such as shadowing - remain uncovered. This paper proposes a realistic and scalable method (RADII - RAy-tracing Data Interpolation and Interfacing) for the simulation of urban propagation. It is fed by extensive ray-tracing data which are summarized so effectively to make the approach computationally affordable.
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