Question: For a UTRA FDD UE supporting DB-DC-HSDPA, what is the primary condition that must be met at the reference sensitivity level (<REFSENS>) at the UE antenna port?
Option 1: The UE must achieve a maximum data throughput of 100 Mbps.
Option 2: The Block Error Ratio (BLER) on each individual cell shall not exceed a specific value.
Option 3: The UE's power consumption is optimized to its lowest possible level.
Option 4: The UE can only operate on a single frequency band.
Explanation: The reference sensitivity level (<REFSENS>) is defined as the minimum mean power received at the UE antenna port, with a key performance indicator being that the Block Error Ratio (BLER) on each individual cell does not exceed a specific threshold. This ensures reliable data transmission under minimal signal conditions for UEs supporting DB-DC-HSDPA in FDD mode, highlighting the importance of error ratio management in telecom network reliability and efficiency.