This page describes the different parameters available to configure the Synapse model in Xirio. These specific parameters are classified in sections Geodata, Inner/Outer area resolution, Radio and Building penetration.

Section Geodata

•Use morphologies: allows you to indicate whether the model should use the morphologies data. If the parameter is not enabled, the model uses the default morphology.It is necessary to add a morphographic layer in the study and configure its terrain types to use this option.

•Use facets: allows you to indicate whether the model should use the facets data. If the parameter is not assigned, the model will calculate without taking this into consideration.To use it, it is necessary to have a DTM that has previusly calculated facets.

•Use graphs: allows you to indicate whether the model should use the graphs data. If the parameter is not assigned, the model will perform calculations without taking this into consideration. To use it, it is necessary to use a DEM that allows the generation of graphs.

Section Inner/Outer area resolution

•Use second mesh size: allows you to indicate whether the model should activate or deactivate the inner/outer area resolution.

•Resolution multiplier factor: allows you to set the second prediction resolution compared with the initial one. The value is an integer value in the range [2;10].

•Distance threshold: allows you to set the transmitter-receiver distance (in meters, 10000 m by default) starting from which, during a calculation, the model changes from a grid using the transmitter’s resolution to a larger one. The value is an integer value in the range [0;99999].

The model takes into account two different resolutions: the transmitter resolution (R1) and the resolution assigned by you (R2). The model checks whether the transmitter-receiver distance is greater than distance threshold (the red circle in the diagram below). If so, it calculates the point under consideration and transfers the results to neighboring pixels. Otherwise, the model calculates each calculation point. For example, in the diagram below, resolution multiplier factor is set to 4.

Section Radio

•Loss correction: indicates the value of the correction (in dB, 0 by default) to add to the total loss of the model. The value is a decimal value in the range [-10;10]. For example, Loss correction = 3 dB means 3 dB more loss. Note: this parameter does not affect the tuning.

•Calculate on water: allows you to indicate whether the model should calculate on water.

•Atmospheric absorption: allows you to indicate whether the model should consider the atmospheric attenuation.

•Rain attenuation: allows you to indicate whether the model should consider the rain fade.

oRainfall rate: allows you to set the quantity of rain (in millimeters per hour, 5 by default). The value is a decimal value in the range [0.25;1000].

Section Building penetration

A first group of parameters define whether the model should consider building penetration or not.

•Do not compute in buildings: allows you to indicate whether the model should inactivate the penetration feature. In this case, the model will not calculate predictions within buildings.

•Calculate indoor only: allows you to indicate whether the model should calculate only in buildings (other calculation points will not be calculated).

•Calculate inside and outside of buildings: allows you to activate the penetration feature. Note: Penetration calculation can appreciably increase calculation time for very high resolutions.

A second group of parameters define how building penetration will be calculated.

•Model-defined penetration: allows you to activate the automatic correction which is estimated according to the frequency, the penetration angle and the distance with regard to the outside of the building. The model calculates only the outdoor pixels in a first pass, and then it calculates indoor pixels that border on at least one pixel calculated during the previous pass. Among the bordering pixels, the model selects the one with the smallest loss and adds a correction to get the loss on the new pixels. It carries on until there are no more uncalculated pixels left.

•User-defined penetration: The user manually set the correction.

oFixed losses: allows you to set the value (decimal value in dB in the range [0;100], 10 by default) of the additional loss to a pixel located inside a building, while at least one of the eight surrounding pixels is found on the street.

oPropagation losses: allows you to set the value (decimal value in dB/m in the range [0;5], 0.66 by default) of the additional loss to a pixel situated inside a building, while all of the eight surrounding pixels are found inside the building.