the WCDMA system is a little different from GSM and others. In GSM, when you used to have problems with traffic demand, you really need to imply more TRXs. But in WCDMA the Transport network is very important and must be primarily verified. Suppose you have a growing traffic that is reaching the transmission BW, then the chosen QoS will be in charge of reducing this BW in order to keep loss and delay requirements. Then, my answer is that you must verify your system before start increasing HW.