Quality-aware network dimensioning for the VoIP service
Quality-aware network dimensioning for the VoIP service
复制标题
VoIP 服务的质量感知网络规模
DOI：
10.23919/softcom.2017.8115576
复制
发表时间：
2017
期刊：
影响因子：
--
通讯作者：
T. Uhl
中科院分区：
文献类型：
--
作者：
J. Klink;T. Uhl
当前的网络是多业务分组交换环境，通常基于互联网协议，其中提供高质量的服务是一个巨大的挑战。几乎所有网络都提供的最受欢迎的服务是语音传输。作为一种实时业务，它对带宽和延迟提出了很高的要求。本文介绍了选定的网络规模问题的语音IP服务。作者讨论了传统电路交换网络中的服务质量措施和影响分组网络中电话服务质量的关键性能指标。本文的主要贡献是利用阻塞概率计算的建议，这是基于传统系统中使用的B-Erlang模型，估计处理IP网络中产生语音流量的多个源所需的平均带宽。考虑到执行一个语音会话所需的平均带宽，计算了总网络容量。作者进行了分析计算，并通过模拟研究证实。文中还讨论了使用不同编解码器的问题及其对带宽消耗和用户体验的整体服务质量的影响。最后，作者指出了今后的研究方向，即发展承载多媒体业务的网络的规模确定方法，特别注意视频传输和可靠的质量评估。
Current networks are multi-service packet-switched environments, very often based on Internet Protocol, where the provision of good quality services is a great challenge. The most popular service, offered by almost every network, is voice transmission. As a real-time service, it places high demands on bandwidth and delay. The paper describes selected network dimensioning problems for the voice over IP service. The authors discuss service quality measures in legacy circuit switched networks and the key performance indicators that influence the quality of telephone service in packet networks. The main contribution of the paper is the proposal of utilizing the blocking probability calculation, which is based on the B-Erlang model used in legacy systems, to estimate the average bandwidth needed to handle a number of sources generating voice traffic in IP networks. Taking into account the average bandwidth required to carry out a one voice conversation, the total network capacity was calculated. The authors made analytical calculations which were confirmed by simulation studies. The problem of using different codecs and their influence on bandwidth consumption and overall service quality experienced by a user were also discussed in the paper. At the end of the paper, the authors defined the directions of further research that should be carried out, i.e. the development of dimensioning methods for networks carrying multimedia services with particular attention paid to video transmission and reliable quality assessment.