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Evaluating the influence of multiplexing schemes and buffer implementation on perceived VoIP conversation quality

机译：评估复用方案和缓冲区实现对感知的VoIP对话质量的影响

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摘要

This work presents a study of RTP multiplexing schemes, which are compared with the normal use of RTP, in terms of experienced quality. Bandwidth saving, latency and packet loss for different options are studied, and some tests of Voice over IP (VoIP) traffic are carried out in order to compare the quality obtained using different implementations of the router buffer. Voice quality is calculated using ITU R-factor, which is a widely accepted quality estimator. The tests show the bandwidth savings of multiplexing, and also the importance of packet size for certain buffers, as latency and packet loss may be affected. The customer's experience improvement is measured, showing that the use of multiplexing can be interesting in some scenarios, like an enterprise with different offices connected via the Internet. The system is also tested using different numbers of samples per packet, and the distribution of the flows into different tunnels is found to be an important factor in order to achieve an optimal perceived quality for each kind of buffer. Crouping all the flows into a single tunnel will not always be the best solution, as the increase of the number of flows does not improve bandwidth efficiency indefinitely. If the buffer penalizes big packets, it will be better to group the flows into a number of tunnels. The router processing capacity has to be taken into account too, as the limit of packets per second it can manage must not be exceeded. The obtained results show that multiplexing is a good way to improve customer's experience of VoIP in scenarios where many RTP flows share the same path.
机译：这项工作提出了对RTP复用方案的研究，就经验质量而言，将其与RTP的正常使用进行了比较。研究了不同选项的带宽节省，延迟和数据包丢失，并对IP语音（VoIP）流量进行了一些测试，以比较使用路由器缓冲区的不同实现方式获得的质量。语音质量是使用ITU R因子计算的，这是一种广为接受的质量估计器。这些测试表明，可以节省多路复用的带宽，而且对于某些缓冲区来说，数据包大小的重要性也很重要，因为可能会影响延迟和数据包丢失。评估了客户的体验改善情况，表明在某些情况下使用多路复用可能很有趣，例如通过互联网连接具有不同办公室的企业。还使用每个数据包使用不同数量的样本对系统进行了测试，发现流到不同隧道中的分布是重要的因素，以便为每种类型的缓冲区实现最佳的感知质量。将所有流量合并到单个隧道中并不一定是最佳解决方案，因为增加流量数量并不能无限地提高带宽效率。如果缓冲区对大数据包不利，最好将流分组到多个隧道中。路由器的处理能力也必须考虑在内，因为不能超过它可以管理的每秒数据包限制。获得的结果表明，在许多RTP流共享同一路径的情况下，多路复用是改善客户VoIP体验的好方法。

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  • 来源
    《Computer networks》 |2012年第7期|1893-1919|共27页
  • 作者

    Jose Saldana; Julian Fernandez-Navajas; Jose Ruiz-Mas; Jenifer Murillo; Eduardo Viruete Navarro; Jose I. Aznar;

  • 作者单位

    Communication Technologies Croup (GTC) - Aragon Institute of Engineering Research (13A), Dpt. IEC, Ada Byron Building, CPS Univ, Zaragoza,50018 Zaragoza, Spain;

    Communication Technologies Croup (GTC) - Aragon Institute of Engineering Research (13A), Dpt. IEC, Ada Byron Building, CPS Univ, Zaragoza,50018 Zaragoza, Spain;

    Communication Technologies Croup (GTC) - Aragon Institute of Engineering Research (13A), Dpt. IEC, Ada Byron Building, CPS Univ, Zaragoza,50018 Zaragoza, Spain;

    Communication Technologies Croup (GTC) - Aragon Institute of Engineering Research (13A), Dpt. IEC, Ada Byron Building, CPS Univ, Zaragoza,50018 Zaragoza, Spain;

    Communication Technologies Croup (GTC) - Aragon Institute of Engineering Research (13A), Dpt. IEC, Ada Byron Building, CPS Univ, Zaragoza,50018 Zaragoza, Spain;

    Communication Technologies Croup (GTC) - Aragon Institute of Engineering Research (13A), Dpt. IEC, Ada Byron Building, CPS Univ, Zaragoza,50018 Zaragoza, Spain;

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  • 正文语种 eng
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  • 关键词

    RTP; Multiplexing; QoS; VoIP; R-factor; Router buffer;

    机译：RTP;复用;服务质量VoIP;R因子路由器缓冲区;

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