Question: In a TDD (Time Division Duplexing) system, as per 3GPP specifications, what determines the reporting accuracy of the Channel Quality Indicator (CQI) in environments with AWGN (Additive White Gaussian Noise) and static orthogonality?
Option 1: Reporting variance and BLER (Block Error Rate) performance based on the transport format indicated by the reported CQI median.
Option 2: Only the Signal-to-Noise Ratio (SNR) of the received signal at the User Equipment (UE).
Option 3: The modulation scheme used for streaming random data from the SS (Synchronization Source) to the UE.
Option 4: The type of Multiple Input Multiple Output (MIMO) configuration employed by the UE.
Explanation: The reporting accuracy of CQI in specified environments is a critical aspect of ensuring reliable communication in wireless networks. It is determined by two key factors: the reporting variance, which reflects how consistently the CQI is reported, and the BLER performance, indicating the error rate in data blocks, both considered against the transport format suggested by the median reported CQI value. This ensures that the network can accurately assess channel conditions to optimize data transmission, highlighting the importance of these metrics in maintaining efficient and reliable communication links, especially in TDD MIMO capable UEs from specific categories and releases onwards.