Question: In a TDD (Time Division Duplex) system, for a UE (User Equipment) supporting HSDPA (High-Speed Downlink Packet Access), what is the primary indicator of poor HS-SCCH (High-Speed Shared Control Channel) detection performance?
Option 1: High error rate in HS-DSCH (High-Speed Downlink Shared Channel) data decoding
Option 2: Frequent retransmissions requested by the UE via the uplink control channel
Option 3: Observation of DTX (Discontinuous Transmission) in the HS-SICH/NACK field when signaled on HS-SCCH
Option 4: Increased power consumption due to prolonged decoding attempts
Explanation: The detection performance of the HS-SCCH is directly tied to incorrectly identifying a transmission as absent (DTX) in the corresponding HS-SICH/NACK field when the UE has been signaled on HS-SCCH, highlighting issues with the channel's detection capabilities.