Question: How is the scrambling sequence generator initialised when the NPDSCH is carrying the BCCH?
Option 1: With c_init = 2^25 * (n_s + 1) where n_s is the first slot of the transmission of the codeword.
Option 2: With a fixed value, regardless of the slot or frame number.
Option 3: With c_init = 2^25 * (n_s + 1) where n_s is the last slot of the transmission of the codeword.
Option 4: Not initialised at all when carrying BCCH.
Explanation: According to the text, if the NPDSCH is carrying the BCCH, the scrambling sequence generator shall be initialised with c_init = 2^25 * (n_s + 1) where n_s is the first slot of the transmission of the codeword. This ensures that the scrambling sequence is properly initialized for each transmission of the BCCH.