Uplink Capacity of VoIP on HSUPA

In this paper, the system performance of VoIP on HSUPA, which is investigated by the semi-analytical prediction and the system level simulations, was studied and presented. The semi-analytical results show the capacity gain of VoIP over HSUPA than 12.2 kbps on DCH in Rel´99. Further, the aforementioned prediction shows the consistency with system level simulation results in principle. Otherwise, the uplink capacity of VoIP over HSUPA with non-scheduled algorithm is mainly dependent on the delay budget and availability of the UE power, which is indicated by the results. HARQ and soft handover can be expected to lower the required UE power and thus increase the capacity. Due to the time sensitivity of VoIP service, a compromise between the maximum number of HARQ retransmissions and the delay budget can be considered to optimize the capacity of VoIP on HSUPA