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The millimeter wave (mmWave) band will provide multi-gigabits-per-secondconnectivity in the radio access of future wireless systems. The highpropagation loss in this portion of the spectrum calls for the deployment oflarge antenna arrays to compensate for the loss through high directional gain,thus introducing a spatial dimension in the channel model to accuratelyrepresent the performance of a mmWave network. In this perspective, ray-tracingcan characterize the channel in terms of Multi Path Components (MPCs) toprovide a highly accurate model, at the price of extreme computationalcomplexity (e.g., for processing detailed environment information about thepropagation), which limits the scalability of the simulations. In this paper,we present possible simplifications to improve the trade-off between accuracyand complexity in ray-tracing simulations at mmWaves by reducing the totalnumber of MPCs. The effect of such simplifications is evaluated from afull-stack perspective through end-to-end simulations, testing differentconfiguration parameters, propagation scenarios, and higher-layer protocolimplementations. We then provide guidelines on the optimal degree ofsimplification, for which it is possible to reduce the complexity ofsimulations with a minimal reduction in accuracy for different deploymentscenarios.

Accuracy vs. Complexity for mmWave Ray-Tracing: A Full Stack Perspective