Question: In a 3GPP-compliant TDD network, how is the HS-DSCH data throughput for fixed reference channels measured at the User Equipment (UE)?
Option 1: By analyzing the UE's transmission power levels over a set period.
Option 2: By counting the amount of data successfully received at the UE through monitoring the ACK/NACK signalling field of the HS-SICH.
Option 3: Through direct measurement of the downlink data rate from the Serving Station (SS) to the UE without considering feedback.
Option 4: By evaluating the UE's capability to switch between different modulation schemes.
Explanation: This is correct because, as per telecom standards, monitoring the ACK/NACK signalling field of the HS-SICH allows for an accurate count of successfully received data at the UE, reflecting the actual throughput experienced by the device, tying the measurement to the reliability and efficiency of the data transfer process from the Serving Station (SS) to the User Equipment (UE).