Question: In a Base Station (BS) conformance testing scenario, as per 3GPP standards, how is Block Error Ratio (BLER) calculated when evaluating the throughput of a Fixed Reference Channel (FRC) test?
Option 1: (NACK + statDTX) / (NACK + statDTX + ACK)
Option 2: (ACK) / (NACK + ACK + statDTX)
Option 3: (statDTX) / (NACK + statDTX + ACK)
Option 4: (NACK) / (ACK + NACK)
Explanation: The correct calculation for Block Error Ratio (BLER) in this context involves considering both the unsuccessful transmissions (indicated by NACK and statistically determined DTX, statDTX) in relation to the total number of transmission attempts (unsuccessful plus successful, indicated by ACK). This ratio provides a comprehensive measure of error rate, directly influencing the throughput assessment. The formula **(NACK + statDTX) / (NACK + statDTX + ACK)** accurately reflects this relationship, making it the correct choice for calculating BLER in FRC tests.