Performance Evaluation of ROHC Reliable and Optimistic Mode for Voice over LTE
Performance Evaluation of ROHC Reliable and Optimistic Mode for Voice over LTE
复制标题
LTE 语音 ROHC 可靠乐观模式的性能评估
DOI：
--
复制
发表时间：
2013
期刊：
影响因子：
--
通讯作者：
Arne Felber
中科院分区：
文献类型：
--
作者：
Andreas Mäder;Arne Felber
长期演进语音承载（VoLTE）对于移动网络运营商至关重要，这样可以避免语音服务回落到3G或2G。由于VoLTE使用IP作为传输协议，稳健头压缩（ROHC）是一项必需的功能，用于减少头部开销并提高传输效率。ROHC定义了两种不同的双向模式——（可靠的）R模式和（乐观的）O模式，它们在实现和操作上存在显著差异。相关规范没有对VoLTE应优先使用哪种模式给出任何建议。这项工作对ROHC的R模式和O模式进行了全面的性能评估。主要结果是，虽然R模式在某些方面具有更好的技术性能，但对语音质量的影响在统计学上并不显著。性能评估是通过一个测试平台进行的，该平台实现了两种ROHC模式，为语音音频质量提供了完整的参考体验质量（QoE）结果。
Voice over LTE (VoLTE) is crucial for mobile network operators in order to avoid falling back to 3G or 2G for voice services. Since VoLTE uses IP as transport protocol, RObust Header Compression (ROHC) is a mandatory feature to reduce header overhead and transport efficiency. ROHC defines two different bidirectional modes -- (R)eliable and (O)ptimistic -- with significant differences in implementation and operation. The relevant specifications do not give any recommendation on which mode should be preferably used for VoLTE. This work contributes a comprehensive performance evaluation of ROHC R-mode and O-mode. The main result is that while R-mode has a better technical performance in some aspects, the impact on the voice quality is statistically not significant. The performance evaluation was conducted by means of a testbed with an implementation of both RoHC modes, providing full reference QoE results for voice audio quality.