Question: For UTRA FDD UE supporting HSDPA (Release 5), what is the minimum measurement interval for EVM (Error Vector Magnitude) when the nominal code power of each individual code in a time-varying signal with multiple spreading codes is constant?
Option 1: One timeslot
Option 2: Half a timeslot, minus any 25μs transient periods
Option 3: Quarter of a timeslot, plus any 25μs transient periods
Option 4: Two timeslots, minus any 50μs transient periods
Explanation: According to specifications for UTRA FDD UE supporting HSDPA in Release 5, when dealing with time-varying signals containing multiple spreading codes with constant nominal code power, the minimum EVM measurement interval is at least half a timeslot, excluding any 25μs transient periods. This ensures a meaningful EVM measurement without capturing expected changes in mean power across a full timeslot.