Question: For a Base Station (BS) operating in non-contiguous spectrum, what is the minimum gap size (Wgap) required for the Adjacent Channel Leakage power Ratio (ACLR) requirement to apply to the **second** adjacent channel within a sub-block gap?
Option 1: Wgap ≥ 10 MHz
Option 2: Wgap ≥ 15 MHz
Option 3: Wgap ≥ 20 MHz
Option 4: Wgap ≥ 25 MHz
Explanation: The correct answer is based on the understanding of ACLR requirements in non-contiguous spectrum operations. According to the telecom standard, for a BS operating in such conditions, the ACLR requirement for the second adjacent channel specifically applies inside any sub-block gap with a minimum gap size (Wgap) of 20 MHz. This ensures controlled interference levels between non-adjacent channels within the fragmented spectrum. **Option 3** correctly reflects this technical specification, highlighting the importance of managing spectral leakage in complex frequency allocations.