The high-speed downlink packet access (HSDPA) which is a cost-effective method for universal mobile telecommunications system (UMTS) technology is discussed. The radio transport channel for HSDPA is mainly characterized by the substantially shorter transmission time interval (TTI) of 2ms, which can reduce delay and enhance the tracking of the time-varying channels more effectively. The adaptive modulation and coding (AMC) can adapt the modulation rank and coding rate to the current channel condition of each user. The transport channel that uses the HSDPA functionality is called high-speed downlink shared channel (HSDSCH). The simulation results confirm that the combined usage of RP-CC algorithms can achieve a significantly better overall performance for the HSDPA network compared with other configurations. The CC mechanisms can optimize the effective link utilization by minimizing the higher layer retransmissions and can also achieve high end-user throughputs.
