Question: In a 1.28 Mcps TDD system, as per 3GPP specifications for Release 7 and later UEs, what metric is used to determine the receive characteristics of a Dedicated Channel (DCH) in challenging propagation conditions?
Option 1: Signal-to-Noise Ratio (SNR)
Option 2: Frame Error Rate (FER)
Option 3: Block Error Ratio (BLER)
Option 4: Bit Error Rate (BER)
Explanation: The correct answer is BLER because, according to the specifications for 1.28 Mcps TDD systems in Release 7 and later UEs, the receive characteristics of a Dedicated Channel (DCH), especially under adverse propagation conditions, are evaluated based on Block Error Ratio (BLER) measurements. This is crucial for assessing the reliability of data transmission over the Dedicated Physical Channel to which the DCH is mapped. BLER provides insights into the error rate at a block level, relevant for packet-based transmissions.