Question: In a multipath fading environment (Case 3), what is the primary metric used to determine the Random Access Channel (RACH) performance in a Base Station (BS) conformance test, according to 3GPP standards?
Option 1: Signal-to-Noise Ratio (SNR) at the receiver input
Option 2: Throughput of the uplink data transmission
Option 3: Latency of the RACH procedure completion
Option 4: Block Error Ratio (BLER) at a specified Eb/N0 limit
Explanation: The correct answer is Option 4 because, as per the provided context, the performance requirement for RACH in multipath fading Case 3 is specifically determined by the maximum allowable Block Error Ratio (BLER) when the receiver's input signal reaches a defined Eb/N0 (Energy per bit to Noise power spectral density ratio) limit. This highlights the importance of BLER as a key performance indicator for assessing reliability and accuracy in wireless communication links, especially under challenging multipath conditions.