Today's advanced simulators facilitate thorough studies on Vehicular Ad hoc NETworks (VANETs). However the choice of the physical layer model in such simulators is a crucial issue that impacts the results. A solution to this challenge might be found with a hybrid model. In this paper, we propose a semi-deterministic channel propagation model for VANETs called UM-CRT. It is based on CRT (Communication Ray Tracer) and SCME—UM (Spatial Channel Model Extended—Urban Micro) which are, respectively, a deterministic channel simulator and a statistical channel model. It uses a process which adjusts the statistical model using relevant parameters obtained from the deterministic simulator. To evaluate realistic VANET transmissions, we have integrated our hybrid model in fully compliant 802.11 p and 802.11 n physical layers. This framework is then used with the NS-2 network simulator. Our simulation results show that UM-CRT is adapted for VANETs simulations in urban areas as it gives a good approximation of realistic channel propagation mechanisms while improving significantly simulation time.
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机译：当今的高级模拟器促进了对车载Ad hoc NETworks（VANET）的深入研究。但是，在这种模拟器中选择物理层模型是影响结果的关键问题。可以通过混合模型找到解决此挑战的方法。在本文中，我们为VANET提出了一种半确定性信道传播模型，称为UM-CRT。它基于CRT（通信射线跟踪器）和SCME-UM（扩展的空间通道模型-城市微型），它们分别是确定性通道模拟器和统计通道模型。它使用一个过程，该过程使用从确定性模拟器获得的相关参数来调整统计模型。为了评估实际的VANET传输，我们将混合模型集成在完全兼容的802.11 p和802.11 n物理层中。然后将此框架与NS-2网络模拟器一起使用。我们的仿真结果表明，UM-CRT适用于城市地区的VANETs仿真，因为它可以很好地逼近实际的信道传播机制，同时可以显着缩短仿真时间。
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