Question: In calculating Total Radiated Sensitivity (TRS) in a Rayleigh fading 3D isotropic environment, what is the primary basis for determining the lowest power received by a User Equipment (UE)/Mobile Station (MS)?
Option 1: Average of all downlink power levels across various field combinations without considering Bit Error Rate (BER).
Option 2: Searching for the highest power received by the UE/MS for a discrete number of field combinations.
Option 3: Calculating the effective isotropic sensitivity (EIS) for a single polarization only.
Option 4: Averaging the power received at each discrete field combination that provides a BER better than the specified target BER level.
Explanation: The correct approach for calculating TRS in such an environment involves identifying the lowest power levels that still meet the desired Bit Error Rate (BER) threshold across multiple field combinations and then averaging these values. This method ensures that the UE/MS's sensitivity is accurately assessed under varied conditions, reflecting real-world signal variability. Option 4 correctly captures this process, emphasizing the importance of BER in determining the TRS.