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Recommendation ITU-R P.1411-10 provides guidance on outdoor short-range propagation over the path lengths below about 1 km and over the frequency range 300 MHz to 100 GHz. For typical scenarios in urban and suburban areas, three closed-form algorithms for site-general models are defined in this Recommendation and implemented in SEAMCAT:

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The recommended values for LoS and NLoS situations to be used for below-rooftop propagation in urban and suburban environments are provided in Table 1.
TABLE 4

Table 1: Basic transmission loss coefficients for ITU-R P.1411-10 §4.1.1

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See description of the model ITU-R P.1411-9 §4.3.1

 SEAMCAT Specific Implementation

The site-general propagation models from §4.1.1 and §4.2.1 are valid only for a given range of Tx-Rx 3D distances ,  If the Tx-Rx 3D distances in the simulation scenario are outside this range, SEAMCAT will inform the user about that in a consistency check before the simulation starts. The simulations can still be run and the values of the basic transmission loss will be computed using the formulas from Recommendation ITU-R P.1411 even for distances that are outside the range of validity.

A special care needs to be taken for distances  as they can result in non-physical values of the basic transmission loss that can be smaller than free-space loss, or even be negative. In that particular case, the median values of the basic transmission loss are capped from below by the free space loss as follows:

Compute PL=PL_1411
if d<d_min:

Compute PL_FreeSpace
PL=max⁡〖(PL,〗  PL_FreeSpace)

Input parameters

The input parameters for the three site-general propagation models from ITU-R P.1411-10 are shown in SEAMCAT GUI in Figure 2 and defined in Table 4.

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