Deterministic ray models(3/3) Advantages over empirical-statistical models: Multipath simulation-multidimensional prediction High accuracy Great versatility Drawbacks: Environment database "cost" High CPU time (of the order of hours for urban prediction over a cell or area) Multipath simulation → multidimensional prediction High accuracy Great versatility Environment database “cost” High CPU time (of the order of hours for urban prediction over a cell or area) Deterministic ray models (3/3) Advantages over empirical-statistical models: Drawbacks: 4