You are here: Manual / Annex / Consistency Check

---

Scenario consistency check

This function is run before the start of event generation with the aim of detecting erroneous or inconsistent values in the scenario definition.

The consistency check includes:

• Warnings if odd configuration detected for random parameters, such as negative antenna height, etc;
• Consistency between inter-dependent parameters such as: C/I, C/(N+I), (N+I)/N, and I/N
• Verification of the application range of propagation models

A list of checked parameters is provided in the following tables.

Propagation models

Applies to	Description	Type of message
Propagation model	According to the link frequency value, the following models are allowed: - Spherical diffraction model is allowed above 1 GHz - Hata model is allowed between 30 MHz and 3 GHz - ITU-R P.1546 model allowed between 30-1000 MHz - Free space model does not have frequency limitations	Warning

Random variables

Applies to	Description	Message
All random parameters	If distribution type is uniform discrete, check that Xmax - Xmin is multiple of the step. Note: This condition is not mandatory to the use of this distribution.	Warning
All random parameters except Path distance factor distribution	Use of Uniform polar (distance) distribution type is inappropriate	Warning
All random parameters except Path elevation distribution	Use Uniform (angle) of following distribution type is inappropriate.	Warning
Distance factor distributions	Use of constant distribution type is inappropriate	Warning

Inter-dependant parameters

Applies to	Description	Message
Coherence between Victim Receiver masks (blocking rejection and inter-modulation rejection) and interfering transmitter frequency distribution.	In case of uniform or constant frequency distribution for the interfering transmitter, check that the definition interval of the distribution is totally included: - in the blocking rejection mask, - in the intermodulation rejection mask.	Error
Coherence between Interfering Transmitter masks (Unwanted emission and unwanted emissions floor) and victim receiver frequency distribution.	In case of uniform or constant frequency distribution for the victim receiver, check that the definition interval of the distribution is totally included: - in the unwanted emissions mask if not constant, - in the interfering transmitter bandwidth if the unwanted emissions mask is assumed constant, - in the intermodulation rejection mask if more than two interfering links are defined.	Error
Receiver C/I, C/N+I, N+I/N, I/N	Consistency check between interference criteria is to be performed: - Between C/I and C/N+I : C/I must be higher than C/N+I. - Between C/I, C/(N+I), and (I+N)/I if these hree parameters are defined. - Between C/I, C/(N+I), and I/N if these 3 parameters are defined. - Between I+N/I and I/N if these two parameters are defined. Due to the non additive formula linking these parameters (see below) a tolerance of ε dB is to be used with a typical value of 0.5 dB	Warning