Question: For a UTRA FDD UE supporting HSDPA, E-DCH, and UL OLTD, what is the primary basis for calculating the Adjacent Channel Leakage Ratio (ACLR) in releases after Release 5?
Option 1: The ratio of the peak power to the mean power within the assigned channel frequency
Option 2: The comparison of the filtered mean power between two adjacent time slots
Option 3: The difference in the total transmission power between the uplink and downlink
Option 4: The ratio of the filtered mean power centred on the assigned channel frequency to the filtered mean power centred on an adjacent channel frequency
Explanation: ACLR measures the power leaked into adjacent channels. For UEs supporting HSDPA, E-DCH, and UL OLTD, this measurement is crucial for signal quality and reducing interference. The correct method compares mean power levels between the assigned channel and an adjacent one, ensuring the UE's transmission doesn't affect neighboring channels, particularly important in FDD systems with simultaneous uplink and downlink transmissions on different frequencies.