Question: For a UTRA FDD UE supporting HSDPA, what does the probability of event E_m (P(E_m)) primarily indicate in relation to HS-SCCH detection performance?
Option 1: The likelihood of successful downlink data transmission on HS-DSCH when signalled on HS-SCCH-1.
Option 2: The probability of observing DTX in the HS-DPCCH/NACK field when not signalled on HS-SCCH-1.
Option 3: The ratio of correctly received to total transmitted HS-SCCH orders for power control.
Option 4: The chance of a UE incorrectly detecting HS-SCCH-1 signalling when DTX is present in the corresponding HS-DPCCH/NACK field.
Explanation: The probability of event E_m (P(E_m)) relates to HS-SCCH detection performance, specifically indicating the likelihood of successful downlink data transmission on HS-DSCH when signalled on HS-SCCH-1. This highlights a key aspect of HSDPA performance in UTRA FDD UEs, focusing on successful downlink data setup or continuation based on HS-SCCH-1 signalling detection.