Question: In a TDD (Time Division Duplex) system for UEs (User Equipment) supporting HSDPA (High-Speed Downlink Packet Access), how is the HS-DSCH (High-Speed Downlink Shared Channel) data throughput measured for variable reference channels?
Option 1: By analyzing the UE's processing power and memory capacity.
Option 2: By counting the amount of data successfully received at the UE, monitored through ACK/NACK signalling on the HS-SICH (High-Speed Shared Control Channel).
Option 3: Through periodic feedback from the UE to the SS (Server/Source) about the quality of the received signal.
Option 4: Based on the theoretical maximum throughput as defined by the UE's capabilities without actual data transfer.
Explanation: This is correct because, according to the principles outlined for measuring HS-DSCH data throughput in variable reference channels for TDD UEs supporting HSDPA, the focus is on the successful receipt of data. Monitoring ACK/NACK signalling on the HS-SICH allows for an accurate count of successfully received data packets, providing a practical measure of throughput during actual data streaming from the SS to the UE.