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引用次数: 0
摘要
本章概述了VoLTE (Voice over LTE)的原理，并概述了VoLTE的主要特性和部署最佳实践。它根据感知客观聆听质量分析(POLQA)平均意见评分(MOS)评分来评估VoLTE语音质量，并将其与过顶(OTT)应用、宽带自适应多速率3G (AMR‐WB)和窄带自适应多速率2G (AMR‐NB)进行比较。本章还概述了部署最佳实践，解释了测试环境，并提供了实际的性能分析。然后介绍增强型语音业务(EVS)编码和语音演化。此外，本章还评估了VoLTE的关键特性，如鲁棒开销压缩(RoHC)、传输时间间隔(TTI)捆绑和半持久调度(SPS)。然后，本章给出基于网络kpi的VoLTE性能评估。讨论了分组错误率对语音质量的影响，分析了调度器的性能。
This chapter summarizes Voice over LTE (VoLTE) principles, and outlines the main VoLTE features along with deployment best practices. It evaluates the VoLTE voice quality in terms of the perceptual objective listening quality analysis (POLQA) mean opinion score (MOS) score and compares it with an over‐the‐top (OTT) application, 3G with adaptive multi‐rate with both wideband (AMR‐WB) and 2G with adaptive multi‐rate with narrowband (AMR‐NB). The chapter also outlines deployment best practices, explains the testing environment, and provides practical performance analysis. It then covers enhanced voice services (EVS) coding and voice evolution. In addition, the chapter also evaluates key VoLTE features such as robust overhead compression (RoHC), transmission time interval (TTI) bundling, and semi‐persistent scheduling (SPS). The chapter then provides VoLTE performance assessment based on the network KPIs. It discusses block error rate (BLER) impact on voice quality, and then analyzes scheduler performance.
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