Deterministic ray models (1/3) "Numerical simulation of multipath propagation according to GTP" Ray models compute(some of the)rays linking the two terminals through free space propagation and multiple interactions with buildings.The geometry and the field of such rays must satisfy GTP rules Interactions,i.e.reflections,diffractions,scatterings are also called "events" Usually all rays experiencing up to a pre-set number of events,N are computed .N also defines the so-called prediction order Ray models can be fully 3-Dimensional (3D)or can resort to simplified 2- dimensional modelling(2D) Ray models's output can be the field(before the Rx antenna)or the received signal (after the Rx antenna).In the latter case,Rx antenna parameters must be input to the model. Deterministic ray models (1/3) “Numerical simulation of multipath propagation according to GTP” • Ray models compute (some of the) rays linking the two terminals through free space propagation and multiple interactions with buildings. The geometry and the field of such rays must satisfy GTP rules • Interactions, i.e. reflections, diffractions, scatterings are also called “events”. Usually all rays experiencing up to a pre-set number of events, Nev are computed • Nev also defines the so-called prediction order • Ray models can be fully 3-Dimensional (3D) or can resort to simplified 2- dimensional modelling (2D) • Ray models’ s output can be the field (before the Rx antenna) or the received signal (after the Rx antenna). In the latter case, Rx antenna parameters must be input to the model. 2