Question: What is the primary basis for defining the absolute accuracy of UTRA (Universal Terrestrial Radio Access) carrier RSSI (Received Signal Strength Indicator) in a TDD (Time Division Duplex) system?
Option 1: Comparison between measured RSSI values across different frequencies.
Option 2: Variance in RSSI readings over time for a single frequency.
Option 3: Difference between the measured UTRA carrier RSSI and the actual UTRA carrier RSSI power on the same frequency.
Option 4: Aggregate signal strength of all connected UEs (User Equipment) in the network.
Explanation: The absolute accuracy of UTRA carrier RSSI is fundamentally about how accurately the measured signal strength reflects the true signal power at a specific frequency. Thus, it's defined by comparing the measured RSSI value to the actual RSSI power on that same frequency, ensuring the measurement's reliability and precision in TDD systems for all types of UTRA TDD UE.