Question: What is the primary purpose of defining the Reference Sensitivity Level (<REFSENS>) in UTRA FDD UEs, according to 3GPP specifications?
Option 1: To ensure the UE's transmitter operates at the maximum allowed power to minimize BER.
Option 2: To establish a minimum received signal strength at the UE antenna for a guaranteed Bit Error Ratio (BER) threshold.
Option 3: To set a universal standard for antenna design across all FDD UEs.
Option 4: To define the maximum permissible noise floor in UTRA FDD networks.
Explanation: The correct answer, Option 2, highlights that <REFSENS> is defined to ensure the UE can maintain a Bit Error Ratio (BER) below a specific threshold when receiving signals at or above this minimum mean power level. This directly impacts the reliability and quality of wireless communications in UTRA FDD networks, ensuring that devices can effectively decode received information without excessive errors, even under low signal conditions.