Using ray tracing(1/2) 。 Ray tracing(RT)is not only a prediction tool,is a realistic multipath propagation model.Therefore using ray tracing doesn't only mean getting coverage or prediction results.As far as the model is realistic,it also allows simulation, study,analysis of the urban multipath propagation phenomenon. RT(or ray launching)is also the most accurate prediction model now available. In terms of radio coverage prediction,a mean error of a fraction ofdB and a stdev of the error of 5-7 dB are achievable in practice. Although RT isn't an empirical model,some run parameters must be set before running RT.The following is a list of typical parameter values for outdoor prediction in european cities Control string:3@***@2dls which means: Nev-3 max.2 diffractions max.I scattering Material parameters:e,=5,s-0.01 [S/m](for all building walls) Coherent mode 22 • Ray tracing (RT) is not only a prediction tool, is a realistic multipath propagation model. Therefore using ray tracing doesn’t only mean getting coverage or prediction results. As far as the model is realistic, it also allows simulation, study, analysis of the urban multipath propagation phenomenon. • RT (or ray launching) is also the most accurate prediction model now available. In terms of radio coverage prediction, a mean error of a fraction of dB and a stdev of the error of 5-7 dB are achievable in practice. • Although RT isn’t an empirical model, some run parameters must be set before running RT. The following is a list of typical parameter values for outdoor prediction in european cities Using ray tracing (1/2) Control string: 3@***@2d1s which means: Nev=3 max. 2 diffractions max. 1 scattering Material parameters: er =5, s=0.01 [S/m] (for all building walls) Coherent mode