Question: In 3GPP specifications, what is the primary metric used to determine the performance requirement of a Dedicated Channel (DCH) in a multipath fading environment, specifically Case 2?
Option 1: Signal-to-Noise Ratio (SNR) at the receiver
Option 2: Block Error Rate (BLER) at a specified Eb/N0 limit
Option 3: Throughput measured across all supported bandwidths
Option 4: Handover success rate in fading conditions
Explanation: The correct answer, Block Error Rate (BLER) at a specified Eb/N0 limit, is the key performance indicator for assessing DCH reliability in challenging multipath environments. BLER directly reflects the channel's error resilience, making it a crucial metric for evaluating base station (BS) conformance under such conditions, as specified in 3GPP standards for FDD systems. This focus on BLER at a defined Eb/N0 threshold ensures that BSs can maintain service quality even in adverse radio propagation scenarios.