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下一代网络NGN的研究 总被引:2,自引:0,他引:2
下一代网络的研究是目前的热点,在研讨下一代网络体系及技术时,应从业务需求的分析入手,考虑网络装备的情况,研究新一代网络体系架构NGN具有广泛的内涵,其研究范围相当广泛,主要研究的内容如下:新业务和应用的研究;网络传送的基础设施;网络体系架构的研究;IP网络技术的研究(IP(v4 and v6)),Quality of service(SLA,measurement and monitoring);网络融合技术的研究;互通和互操作的研究;新型的控制、管理和运维机制;各网络单元的研究(Home,access,edge,core);新的网络协议的研究;网络安全体系和技术的研究;测试技术的研究。 相似文献
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本文首先介绍了下一代网络所支持的几个令人感兴趣的服务用例和能力,然后描述了ITU-T下一代网络重点工作组在下一代网络发布文件1中所认定的目标环境,相关服务和某些关键能力,最后给出了几个能反映其能力的服务案例。 相似文献
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ITU-TSG中国代表团 《中兴通讯技术》2001,(1):32-34
▲ITU-T在新研究期(2001~2004年)里对各研究组的研究领域进行了相应调整▲WTSA-2000会议决议,ITU-TSG13被命名为多协议和IP网络及其互通研究组▲在2001~2004年的研究期,SG13共有16个研究课题 相似文献
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文章分析了NGN的分层结构,结合现存网络体系给出一种完整的NGN多媒体通信框架方案,解决了在NGN上实现多媒体业务的有关技术问题.最后,指出了NGN有待于解决的若干问题以及下一步的主要工作. 相似文献
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ITU-T QoS standards for IP-based networks 总被引:3,自引:0,他引:3
To support IP/PSTN convergence, future IP networks will need to provide reliable differentiated QoS to a diverse set of user applications, including telephony. To achieve end-to-end QoS solutions, IP network providers will need to agree on a common set of IP packet transfer performance parameters and QoS objectives. This article describes two new ITU-T Recommendations, Y.1540 and Y.1541, that document such an agreement. 相似文献
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Next-generation networks (NGN) is a new concept commonly used by network designers to depict their vision of future telecommunications networks. However, various views on NGN have been expressed so far by operators, manufacturers, and service providers, and the general wish is now to come to a common understanding on NGN and to prepare standards on it. This is the reason why the ITU-T has decided to start the standardization process on NGN under the form of a new ITU-T Project prepared by Study Group 13. This new Project is in line with results from the existing ITU-T Project on Global Information Infrastructure (GII) because NGN is seen as a concrete realization of the GII. The NGN 2004 Project is a coordination structure led by Study Group 13, with the role of organizing studies on NGN in ITU-T. The target for the NGN 2004 Project is to prepare Recommendations in 2004 相似文献
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多媒体通信是近年来通信技术方面研究的特点,是目前电信界最热门和最活跃的研究方向,也是与市场结合得最紧密的研究课题。 相似文献
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《Communications Magazine, IEEE》2008,46(10):116-122
In May 2005 the ITU-T approved ITU-T G.722.1 Annex C. This Annex extends the G.722.1 codec from 7 kHz audio bandwidth to 14 kHz, 1 octave better than the current ITU-T wideband algorithms. It is a low-complexity audio codec operating at 24, 32, and 48 kb/s. Like the main ITU-T G.722.1 recommendation, its main application is videoconferencing. This article presents the standardization stages from the definition of the foreseen applications and specification of the requirements to the performance evaluation. The adaptation and design of new software tools (included in the ITU-T software tool library, STL), and the utilization of ITU-T P-series recommendations (dealing with transmission characteristics and performance characterization of telephone transmission quality) are also presented. 相似文献
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对于用于传送广播电视节目的国家和城域干线网,误码性能是一个关键的传输性能指标。本文介绍了ITU—T的几个主要的误码性能建议,希望能对干线网传输系统的建设和维护有所帮助。 相似文献
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It is estimated that ICTs contribute around 2 percent of global greenhouse gas emissions. These percentages are likely to grow as ICTs become more widely available. At the same time, ICTs can be a major linchpin in efforts to combat climate change and serve as a potent cross-cutting tool to limit and ultimately reduce GHG emissions across economic and social sectors. This article looks at the potential role ICTs play at different stages, from contributing to global warming to monitoring it, to developing long-term solutions to mitigate its effects, both directly in the ICT sector and in other sectors such as energy, transport, buildings, and finally to helping adapt to its effects. The article addresses the efforts made by the ITU and its membership to develop new climate-friendly technologies. 相似文献
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ITU-T在网络管理标准方面的制定大体经历了三个阶段,即1997年以来的第一代经典TMN阶段、1997至2000年的第二代扩展TMN阶段和从2001年开始的包括TMN在内的第三代网络管理阶段。“十五”期间我国的网络管理标准研究工作将放在第三代移动通信、IP网络、光网络3个重点领域。 相似文献
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ITU-TIP网络标准研究进展 总被引:1,自引:0,他引:1
ITU-TSG中国专家组 《中兴通讯技术》2002,8(2):34-38
国际电联第13研究组2001年-2004年研究期第2次会议,在下述方面作出了努力,并取得成果。 相似文献
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波分复用技术在HFC网络中的应用方式研究 总被引:1,自引:0,他引:1
文章研究了波分复用(WDM)技术在混合光纤/同轴电缆(HFC)网络中的应用方式.着重对密集波分复用(DWDM)技术和粗波分复用(CWDM)技术在HFC网络的下行方向和上行方向的应用方式进行了研究.研究结果表明,DWDM技术适用于HFC网络的下行方向,可以延长HFC网络的传输距离;CWDM技术适用于HFC网络的上行方向,可以增加HFC网络的上行带宽.利用WDM技术可以实现HFC网络的双向传输. 相似文献