Question: What is the primary purpose of measuring Adjacent Channel Selectivity (ACS) in a UTRA FDD User Equipment (UE)?
Option 1: To evaluate the UE's transmitter power in relation to adjacent channel frequencies.
Option 2: To assess the UE's ability to transmit simultaneously on multiple channels.
Option 3: To determine the UE's receiver sensitivity in the absence of interference.
Option 4: To quantify the UE's receiver's ability to filter out adjacent channel signals when receiving a W-CDMA signal at its assigned frequency.
Explanation: Adjacent Channel Selectivity (ACS) is crucial for understanding how well a UE's receiver can isolate and receive the intended W-CDMA signal amidst interference from adjacent channels. This measurement directly impacts the UE's performance in densely populated spectral environments, ensuring that the device can maintain signal integrity and quality. Therefore, Option 4 accurately reflects the primary purpose of measuring ACS in a UTRA FDD UE.