Question: For PUCCH format 4, what is the number of encoded ACK/NACK bits per sub-frame when 2PRB (Physical Resource Blocks) are allocated?
Option 1: 64AN bits
Option 2: 48AN bits
Option 3: 32AN bits
Option 4: 24AN bits
Explanation: According to the specified requirements for PUCCH format 4, when 2PRB are allocated, the defined number of encoded ACK/NACK bits per sub-frame increases to accommodate more information, crucial for reliable feedback in wireless communications. This setup specifically supports 64AN bits, enhancing capacity for acknowledging or negating acknowledgments (ACK/NACK) in each sub-frame, particularly beneficial in scenarios requiring high throughput and low latency, such as in 5G networks utilizing TDD-FDD Carrier Aggregation (CA).