The MFS is in charge of the PDCH allocation.
However, it is the BSC that provides “useable” TCH to the MFS, so that the MFS can use them as PDCH.
Anyway, here are the parameters you should check:
MAX_PDCH_PER_TBF = 4 or 5
GPRS_MULTISLOT_CLASS_DEF_VALUE = 8
Also check out the following :
MAX_PDCH = “number of TCH in the cell * 80%”
MAX_PDCH_HIGH_LOAD “number of TCH in the cell * 20%”
MIN_PDCH = 0 or 1
But the limitation might be due to congestion on TCH : Check your NPO indicators…
Is your cell with high TCH load ?