Question: In E-UTRA, for PUCCH format 2, what is the defined size of the CQI information bit payload transmitted per PUCCH transmission?
Option 1: 2 bits
Option 2: 3 bits
Option 3: Variable, dependent on subframe configuration
Option 4: 4 bits
Explanation: According to the specified requirements for PUCCH format 2 in E-UTRA, each PUCCH transmission carries a fixed amount of CQI (Channel Quality Indicator) information. This is standardized to ensure consistent and reliable feedback for link adaptation and scheduling purposes. The correct payload size supports the necessary granularity for effective channel quality reporting without overloading the control channel.