【作者】 金杰；

【导师】 方向忠； 倪晨鸣；

【作者基本信息】 上海交通大学 ， 有线通信， 2006， 硕士

【摘要】 本文针对目前国内HFC网络上VOIP技术应用的空白,进行相应的研究和测试。对VOIP技术应用中核心协议的发展进行了总结,并且提出可以采用目前流行的软交换技术作为HFC网络上开展VOIP业务的核心协议。论文在接入网协议的选择方面,进行了重点研究,并提出了基于Docsis协议的简单策略,相比国外标准的PCMM协议节约了不少投资。同时对简单策略下在HFC网络上共享数据传输中如何区分VOIP数据流,以及如何保证已经完成区分的VOIP数据流的高质量传输作了大量的测试,并且进行现实环境模拟,得出相应的参数设置和可行的结论。对于HFC网络的共享结构造成的VOIP上行数据传输的QOS问题,从带宽扩容保证,上行信号调制度的提高,以及新技术的革新等方面进行研究总结,同时在上行噪声对于上行链路性能的影响方面作了分析,提出终端发送电平的参考数值和侵入噪声控制的方法,从而保证传输的QOS。文中还对VOIP技术在HFC网络运营初期碰到的主要问题做了探讨,为其他有线运营商在将来进行VOIP技术应用时提供经验借鉴。更多还原

【Abstract】 According to the blank of the present domestic VOIP technology application on HFC network, here gives a lot of corresponding research and the test in this article. After summarizing the development of the core protocol of VOIP technology application, it gives the core protocol choice of the application on HFC network which is softswitch. The key research in the paper is the protocol of the access protocol of VOIP application on HFC network. With some investment analysis on system construction using PCMM protocol, here gives a innovative simple protocol which is based on docsis protocol. In the paper gives the methods on how to identify the VIOP data flow and how to guarantee the VOIP data transportation based on a lot of testing and real environment imitation. The difficult problem on VOIP system based on HFC network is QOS guarantee in the access network, there gives a lot of ways to get the better environment on the access network like bandwidth enhancement, modulation upgrading, new technology deploying such as Docsis3.0 etc., configuration of upstream transmit power, reverse path optimizing and noise controlling. Also it lists some most important problems in the beginning of system construction under the simple protocol, here gives the answers and suggestions on the更多还原