Question: In calculating Total Radiated Sensitivity (TRS) for a User Equipment (UE), what is the primary basis for determining TRS in a Rayleigh fading 3-dimensional isotropic environment?
Option 1: Average power transfer function calibrated with a continuous range of field combinations.
Option 2: Searching for the lowest power received by the UE's antenna that yields a Bit Error Rate (BER) better than the specified target BER level, across a discrete number of field combinations.
Option 3: Direct measurement of the effective isotropic sensitivity (EIS) without considering polarization or solid angle.
Option 4: Calculation based solely on the reflection coefficient and path loss in cables connecting the measurement receiver to the fixed measurement antenna.
Explanation: In a Rayleigh fading 3-dimensional isotropic environment, TRS calculation is based on identifying the minimum power at which the UE achieves a BER that meets or exceeds the target threshold. This involves testing across multiple discrete field combinations in the chamber to find this threshold, making Option 2 the correct approach as per the provided telecom concept.