Question: For an MPDCCH associated with a 2+4 PRB set, what determines the scrambling sequence generation for mapping to REs in different PRB configurations?
Option 1: The subframe number of the last subframe in each block of consecutive subframes
Option 2: The MPDCCH set number and a fixed value defined by the frame structure type
Option 3: The MPDCCH set number (n_ID_MPDCCH) used to generate the scrambling sequence
Option 4: The absolute subframe number of the last downlink subframe intended for the MPDCCH
Explanation: According to the scrambling rules for MPDCCH, the same scrambling sequence is applied per subframe based on the MPDCCH set number (n_ID_MPDCCH), influencing how the sequence is generated for mapping to Resource Elements across different PRB configurations.