Question: In a UTRA FDD (Frequency Division Duplex) system, what is the reference point for measuring the UE (User Equipment) Rx-Tx (Receive-Transmit) time difference?
Option 1: The base station antenna
Option 2: The UE's processor clock cycle
Option 3: The antenna connector of the UE
Option 4: The point of signal handover between cells
Explanation: The correct answer is Option 3 because, according to standard telecom measurement practices for UTRA FDD systems (like those specified in 3GPP standards), the UE Rx-Tx time difference is a critical parameter that must be measured from a defined physical reference point on the device. Measuring from the antenna connector of the UE provides a consistent and reliable point of reference, ensuring accurate assessment of the time difference between uplink transmission and downlink reception. This specificity is crucial for optimizing network performance and ensuring conformance to technical specifications.