Compliance prediction
1. By EIRP calculation
For single transmitter sites, the sum of EIRP/EIRPth over the available frequencies at various accessible points surrounding the BTS. There is a special formula for computing EIRPth. The calculation is detailed in ITU K.52 Annex B.
Site decalred compliant if the value of EIRP/EIRPth is less than unity at all points in the environment.
2. By Software simulation
When 2 or more antennas are used (shared sites etc), complex environment (reflections from building, earth elevation etc), require sophisticated multi-ray algorithms. For complex scattering environment, detailed electromagnetic mapping must be made based on specific ray tracing methods (refero to ITU K.61).
Results must be presented in:
- in the form of power density
- calculated in plane of interest
- percentage of ICNIRP general public reference level with logarithmic legend.
MCMC requirement: 2 meters above roof top level, ground level, roof top or floors of adjacent building in the vicinity of 30 meters radius from the BTS.
The compliance of a BTS site can be predicted using 2 methods:
- calculation of EIRP
- software (using ray-tracing algorithms)
The test results are presented in a report form which includes antenna parameters and a cross-sectional map of power density in the plane of interest. The information can be used by the authorities (for what?) and the general public (for what?).
The report also contains exclusion zones for telco workers and public.
The report also includes recommendation for installing warning signs on the BTS.
Based on the simulated results, if exposure found that the exposure is 30% more than ICNIRP public, EMF measurements are recommended.
