QoS-enabled voice support in the next-generation Internet: issues, existing approaches and challenges
QoS-enabled voice support in the next-generation Internet: issues, existing approaches and challenges
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下一代互联网中支持 QoS 的语音支持：问题、现有方法和挑战
DOI：
10.1109/35.833557
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
Yiwei Thomas Hou
中科院分区：
文献类型：
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作者：
Bo Li;M. Hamdi;Dongyi Iang;Xi;Yiwei Thomas Hou
互联网正处于快速增长和不断演进之中，以适应越来越多的具有不同服务需求的应用。特别是，互联网电话或IP语音是目前正在部署的最有前途的服务之一。除了潜在的大幅度降低成本外，互联网电话还可以提供许多新的功能，并更容易与广泛采用的基于Web的服务相结合。尽管有这些优势，但互联网电话的广泛部署仍然存在一些障碍。然而，最突出的问题是如何确保语音会话所需的QoS。本文的目的是调查国家的最先进的技术，使QoS支持的语音通信在下一代互联网。在本文中，我们首先回顾了现有的支持IP网络上的语音的技术，包括IETF互联网电话架构和ITU-T H.323相关建议的基本机制。然后，我们讨论了IETF的QoS框架，特别是Intserv和Diffserv框架。最后，我们提出了两个领先的公司（思科和朗讯）的解决方案，提供IP电话服务的例子来说明如何实现真实的系统。
The Internet is under rapid growth and continuous evolution in order to accommodate an increasingly large number of applications with diverse service requirements. In particular, Internet telephony, or voice over IP is one of the most promising services currently being deployed. Besides the potentially significant cost reduction, Internet telephony can offer many new features and easier integration with widely adopted Web-based services. Despite these advantages, there still exist a number of barriers to the widespread deployment of Internet telephony. The most prominent one, however, is how to ensure the QoS needed for voice conversation. The purpose of this article is to survey the state-of-the-art technologies in enabling the QoS support for voice communications in the next-generation Internet. In this article, we first review the existing technologies in supporting voice over IP networks, including the basic mechanisms in the IETF Internet telephony architecture and ITU-T H.323-related Recommendations. We then discuss the IETF QoS framework, specifically the Intserv and Diffserv framework. Finally, we present two leading companies' (Cisco and Lucent) solutions to offering IP telephony services as examples to illustrate how real systems are implemented.