Question: For fast SCell activation, if an Enhanced Scell Activation/Deactivation MAC-CE indicates a second CSI-RS burst is present in an SCell, how does the UE determine the start of this second burst?
Option 1: The first slot of the second CSI-RS burst starts immediately after the last slot of the first CSI-RS burst without any gap.
Option 2: The UE calculates the start based on a fixed offset defined in the specifications for all networks.
Option 3: The first slot of the second CSI-RS burst starts at the m2th SCell slot after the end of the first CSI-RS burst, where m2 is provided by gapBetweenBursts.
Option 4: The start of the second CSI-RS burst is signaled explicitly in each Enhanced Scell Activation/Deactivation MAC-CE.
Explanation: According to the specified behavior for fast SCell activation, when a second CSI-RS burst is indicated, its starting position is determined by an offset (m2) provided by gapBetweenBursts, measured from the end of the first CSI-RS burst. This ensures flexibility and configurability in the timing between bursts based on network settings.