Question: In a Base Station (BS) conformance testing for TDD (Time Division Duplexing) using the 1.28 Mcps TDD option, what is the primary purpose of measuring the RRC filtered mean power at adjacent RF channels (steps 3, 6, 8, and 11) in relation to the assigned channel frequency?
Option 1: To optimize transmission power for better coverage
Option 2: To detect and prevent interference from neighboring cells
Option 3: To ensure compliance with regulatory emission masks
Option 4: To calculate the Adjacent Channel Leakage Ratio (ACLR) for assessing out-of-band emissions
Explanation: The correct answer is Option 4 because the process described in the steps (measuring RRC filtered mean power at adjacent RF channels and comparing it to the average power of the assigned channel) is used to calculate the Adjacent Channel Leakage Ratio (ACLR). ACLR is a key metric for evaluating how much of a transmitter's signal leaks into adjacent frequency channels, which is crucial for assessing out-of-band emissions and ensuring minimal interference with other wireless communications in nearby channels. This directly impacts the efficient use of spectrum and maintaining quality of service in wireless networks.