Well, perhaps Siemens did a mistake in their vocabulary, but 1 PDCH = 1 Timeslot. A PDCH is a physical timeslot. You can’t have more than 1 PDCH in one timeslot.
… And, within 1 PDCH you can multiplex several TBF (several users).
So the formulas we proposed should be valid.
What is Nallpdch_Meadl ?