Abstract
The High Speed Packet Access (HSPA) protocol is evolving to enable higher transmission rates and improve system capacity. The evolution of wireless mobile communications had been encouraged by the high bit rates and low delay demands of new applications such as Voice over IP (VoIP), web browsing, and FTP. VoIP is a key driver in the evolution of voice communications, and the high transmission rate property of HSPA is expected to satisfy the strict delay requirements of VoIP. Therefore, the aim of this paper is to evaluate the performance of VoIP service in HSPA network. This paper also presents a mathematical model for VoIP capacity in HSPA under the constrains of delay threshold and voice quality requirements. This study also analyzes the impact of scheduling schemes, the user’s channel quality, and variations in packet bundle size on VoIP performance. These results are derived from simulation results, which also validate the correctness of the proposed analysis model and show that VoIP performance is limited by uplink transmission technology. Following the E-model, this study concentrates on each VoIP connection’s quality in HSUPA network.