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首页> 外文会议>International Workshop on Multimedia Interactive Protocols and Systems(MIPS 2004); 20041116-19; Grenoble(FR) >Background Noise Influence on VoIP Traffic Profile
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Background Noise Influence on VoIP Traffic Profile

机译：背景噪声对VoIP流量配置文件的影响

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摘要

Modern audio codecs used in VoIP can improve the listening quality by transmitting the main characteristics of the background noise signal during the silence periods. This traffic has been traditionally neglected in the codec mean bit-rate estimation. Nevertheless, when considering an IP environment, the packet overhead increases significantly the required mean transmission bit-rate. Hence, the transmission of the background noise signal can result into either a poor network resource dimensioning in network planning or in the violation of the SLA traffic specifications in a DiffServ scenario. This paper presents a study on the influence of the background noise signal in the mean transmission bit rate required by conversations in IP networks. A new traffic pattern generation model is presented, for which an analytical expression for the mean bit rate is derived. This model is parametrized for the G.729B and the GSM AMR codecs. Experimental results show that this new model significantly enhances the current mean bit rate estimation. The traffic profile of aggregated audio traffic is also addressed, obtaining results which improve the current ON-OFF aggregated traffic models.
机译：VoIP中使用的现代音频编解码器可以通过在静默期间传输背景噪声信号的主要特征来提高收听质量。传统上，在编解码器平均比特率估算中忽略了此流量。但是，在考虑IP环境时，数据包开销会显着增加所需的平均传输比特率。因此，背景噪声信号的传输可能导致网络规划中的网络资源尺寸不佳，或者导致DiffServ场景中违反SLA流量规范。本文研究了背景噪声信号对IP网络中会话所需的平均传输比特率的影响。提出了一种新的流量模式生成模型，针对该模型导出了平均比特率的解析表达式。该模型针对G.729B和GSM AMR编解码器进行了参数设置。实验结果表明，该新模型大大增强了当前的平均比特率估计。还解决了聚合音频流量的流量配置文件，从而获得了可改善当前ON-OFF聚合流量模型的结果。

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