Question: For a UTRA FDD UE supporting HSDPA, E-DCH, and UL CLTD, what is the primary focus of the Adjacent Channel Leakage Ratio (ACLR) measurement in terms of power comparison, as per Release 11 and later releases?
Option 1: Comparison of the filtered mean power within two adjacent channel frequencies.
Option 2: Ratio of the filtered mean power centred on the assigned channel frequency to the filtered mean power centred on an adjacent channel frequency.
Option 3: Evaluation of the peak power in the assigned channel versus the average power in an adjacent channel.
Option 4: Assessment of the total power transmitted across all supported channels.
Explanation: The correct answer, Option 2, accurately describes the ACLR measurement focus for UTRA FDD UEs (supporting HSDPA, E-DCH, and UL CLTD) in Release 11 and later. This ratio highlights how much of the transmitted power leaks into adjacent channels, which is crucial for maintaining channel integrity and minimizing interference in wireless communications. This understanding is vital for ensuring conformance to telecommunication standards, particularly in the context of radio transmission and reception specifications.