When the number of VOLTE users in a cell is large, which of the following the capacity of channels can be directly increased by enabling semi-static scheduling and ROHC? (Multiple choice)

When the number of VOLTE users in a cell is large, which of the following the capacity of channels can be directly increased by enabling semi-static scheduling and ROHC? (Multiple choice)
A . PDSCH
B . PUCCH
C . PDCCH
D . PRACH

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Answer: AC