高速分組接入(HSPA)技術的發展，提高了傳輸速率和系統容量的改善。無線移動通信的演進受到高傳輸速度和低延遲時間要求的新服務應用，如IP語音(VoIP)，網頁瀏覽，和FTP的鼓舞，又因VoIP在無線移動通信網路扮演了關鍵的發展影響因素，而此具有高傳輸速率特性的HSPA預計將可以提升對延遲時間要求嚴格的VoIP服務之系統容量。因此，此論文目標將評估在HSPA網路中VoIP 系統容量的變化。本文所提出數學模型，主要是分析在HSPA環境下，滿足延遲需求的VoIP的系統容量。這項研究還討論了不同的調度方案，用戶的信道質量的優劣，以及不同的數據包束大小對VoIP容量的影響。這些成果來自模擬的結果，也驗證了分析模型的正確性。考慮到VoIP通信的對稱性，從我們的模擬結果發現VoIP的系統容量是受到限制上行傳輸技術，並透過E-model去確保我們所分析得到的系統容是滿足使用者對傳輸品質的要求。

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.

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