Dedicated Channel Capacity of a

Keeping an eye on the future upcoming demands for mobile applications, 3GPP has the target to enhance the downlink packet data rate in many folds. As a result, WCDMA specifications have been evolved with the addition of a new feature called HSDPA (High Speed Downlink Packet Access) in Release 5. The goal of HSDPA has been to increase the system capacity by increasing the data rate and reduce the round trip delay. The increase of system capacity has been achieved by dynamic sharing of code resource and certain amount of power. A number of research papers have shown that HSDPA will enhance WCDMA system with the fulfillment of the above objective. As per the business forcast, HSDPA will start getting deployed towards the end of this year (2005). However, in a real deployment scenario, it may happen that some of the cells are implemented with HSDPA and some are not yet; what will happen to the capacity of those cells without HSDPA? When HSDPA is implemented in a cell, the base station uses more power, imparting more interference to the neighbourin