Question: In the context of measuring Occupied Bandwidth for HSDPA Data transmission as per 3GPP specifications, what is the primary purpose of identifying the "Lower Frequency" and "Upper Frequency" points during the power spectrum distribution measurement?
Option 1: To adjust the transmit power of the UE to minimize interference.
Option 2: To determine the optimal RBW (Resolution Bandwidth) for the spectrum analyzer filter.
Option 3: To calculate the total transmission power for regulatory compliance.
Option 4: To accurately define the Occupied Bandwidth by pinpointing the frequencies at which the signal power drops to 0.5% of the Total Power.
Explanation: The correct answer, Option 4, highlights the key purpose of identifying "Lower Frequency" and "Upper Frequency" - to precisely determine the Occupied Bandwidth by marking the points where the signal’s power diminishes to 0.5% of the Total Power. This is crucial for ensuring compliance with spectral mask requirements and minimizing potential interference with adjacent channels in wireless communication systems, particularly in HSDPA (High-Speed Downlink Packet Access) scenarios.