To Mohhamed,
We calculate traffic in terms of Erlang
Take the total nos of TRX in to consideration,Remove the BCCH time slot and we have got 7 ts in one carrier .
Take the equivalent erlang in the TS
Take erlang per subscriber
divide the total erlang by erlang per carrier(depending on the carrier)
And lo u get the max subsccriber(max voice traffic)in the carrier