Question: In a TDD system, what determines the reporting accuracy of the Channel Quality Indicator (CQI) under AWGN environments for a User Equipment (UE) supporting HSDPA?
Option 1: Reporting variance and Block Error Rate (BLER) performance using the transport format indicated by the reported CQI median.
Option 2: Signal-to-Noise Ratio (SNR) measurements and the type of modulation scheme employed.
Option 3: The UE's receiver sensitivity and the bandwidth of the AWGN channel.
Option 4: The number of parallel data streams and the UE's HSDPA category.
Explanation: The reporting accuracy of CQI under AWGN environments is influenced by how accurately the UE reports channel conditions, reflected in reporting variance. Additionally, BLER performance in relation to the transport format suggested by the CQI median impacts the effectiveness of the reported CQI, considering both report precision and its practical application in maintaining reliable communication.