hello,
you mean, one full TRX (8 timeslots) statically allocated as PDCH, all the time ?
definitely, that will enhance your EDGE throughput, because the throughputs won’t get reduced due to CS TCH preempting the PDCH.
But that’s too much, you will loose too much capacity on the voice. I would say that keeping 1 or 2 PDCH / cell statically is usually enough to keep users happy at busy hour.