承载网分组化的渐进式演进法则

目前,IPTV、视频点播等IP业务大量涌现,电信业务IP化对传送网提出了新的要求,下一代传送网已经呈现出由网络边缘分组化向核心网分组化的演进趋势。中兴通讯传输产品规划总工程师王加莹博士就电信业界关心的承载网分组化演进问题以及中兴通讯的总体规划,与本刊记者进行了深入交流。     

基于T-MPLS分组传送网的组网和演讲

传送网分组化对下一代传送网的结构、功能和运营成本等方面均有很大的影响,是当前在通信产业界受人关注的技术热点.本文讨论了分组化传送网的特点,T-MPLS网络的模型、网络的结构,伪线技术的应用以及向分组传送网演进的方法.     

基于T-MPLS分组传送网的组网和演进

传送网分组化对下一代传送网的结构、功能和运营成本等方面均有很大的影响,是当前在通信产业界受人关注的技术热点。本文讨论了分组化传送网的特点,T-MPLS网络的模型、网络的结构,伪线技术的应用以及向分组传送网演进的方法。     

面向IP的分组传送网发展思路

当前,无论是移动业务还是固网业务,都面临着从以语音电路业务为主向以数据分组业务为主的转变局面。为适应这种业务模式的转型,面向IP化的分组传送网的概念被提出。本文从移动运营商的传送网应如何面对网络IP化的角度出发,分析了业务和网络的IP化给传送网带来的新的挑战并从IP化的概念和分类来看传送网的技术演进;在给出分组传送网的定位之后,对当前分组传送网的主流技术及其特点进行分析,阐明各种技术之间的差异和尚待解决的问题,并给出面向IP的分组传送网的发展思路。     

LTE时代分组传送网的演进策略

通过分析分组传送网络对二层技术、UTRAN多接口综合接入、高带宽、时延要求的适应性,详细介绍了分组传送网对LTE网络的支持能力,并给出了分组传送网的演进思路和规划策略,从而为建设可平滑演进的分组传送网提供参考依据。     

分组传送网技术发展回顾和展望

描述了分组传送网演进的驱动力和演进历史,同时对分组传送网发展的前景进行了展望。     

华为携手浙江移动建设目前全球规模最大的分组化基站传送网

3月10日,华为宣布,浙江移动将在其TD—SCDMA基站传送网建设项目中选用华为PTN解决方案建设分组传送商用试验网,完成基站传送网向全IP的演进。该网络将成为目前伞球规模最大的分组化基站传送网络。     

光传输网分组化演进与发展

文章对IP化趋势下的传送网技术三元素演变情况进行了分析,对光传输网各层面的分组化演进方向进行了综述,指出WDM-OTN是目前干线和城域核心层面比较广泛接受的技术,而PTN将是城域内传送网分组化的发展方向。     

分组传送网技术发展回顾和展望

首先描述了分组传送网演进的驱动力和演进历史,然后对分组传送网发展的前景进行了展望。     

信息网IP化后SDH的演进趋势研究

近几年来,我国数据业务呈现快速增长的趋势.文章分析了信息网IP化后SDH传送网的演进趋势,预测在相当长的时期内SDH将继续担当传送网的主要角色,从长期来看,传送网技术将逐步向基于分组的传送技术和SDH技术共存的方向演进.文章研究了其对SDH网络结构的影响,最后给出了SDH向网状网方向演进的策略和步骤.     

MPLS-TP分组传送网与现有网络互联互通的实现

在光传送网向分组传送网演进的过程中,网络之间的互联互通是运营商关心的主要问题之一.文章简要介绍了MPLS-TP(MPLS Transport Profile)分组传送网的网络构成,分析了在多种传送网并存的情况下,基于MPLS-TP分组传送网的多层网络结构,重点讨论了MPLS-TP分组传送网与IP/MPLS网络以及SDH/MSTP网络之间互联互通的实现方案.     

PTN在移动传输网分组化进程中的应用

电信业务和网络正在逐步演进为面向分组的业务和网络,移动城域网正面临着全面的建设和改造,即由电路域向分组域演进。3G网络的全面敷设带来了海量增长的数据业务源,这是推动城域网全面改造的原动力。本文重点介绍了分组传送网（PTN）技术在移动传输网中的重要地位和基于PTN组网的回传方案在HSDPA数据传输中的应用,介绍了将PTN设备作为网络分组化进程中的核心设备的方案,即一种网络融合、业务融合及运营商融合的新模式。     

新世纪初期的光通信网

扼要说明通信网的发展进程,对未来光通信网分别解释其波长路由与波长控制,分组交换与突发交换、以及IP配合ATM和WDM的传送方式。     

分组传送网环网保护机制的探讨

随着3G移动通信系统IP化和面向IP的全业务时代的到来,城域传送网络正面临着由基于电路交换的SDH网络向基于分组交换的电信级分组传送网（PTN）的逐步演进趋势。保护是PTN满足运营商级需求的重要特性。本文介绍了PTN各种保护机制,重点针对应用在移动回传网络中的PTN环网保护方式进行了探讨,并对各种故障类型触发保护的实现机制进行了分析。     

分组传送网络的业务承载方案分析与部署规划

在分析分组网络发展基础上,比较了基于IP／MPLS技术的主流分组承载方案,描述了L2＋L3分组方案部署实例和网络规划。     

Design of transmission and multiplexing systems for broadbandpacket networks

Dynamic time-division multiplexing (DTDM) is a flexible network transport technique capable of handling both continuous and bursty traffic effectively. By using three different multiplexing architectures in the network, DTDM permits graceful evolution of the existing circuit switching network into a flexible broadband packet communications network supporting integrated voice, data, and video traffic. The first multiplexing stage uses a packet assembler to multiplex different broadband services into a common DTDM-format serial bit stream. The second multiplexing stage uses a statistical packet multiplexer to concentrate network traffic for more efficient use of transmission facilities. The third multiplexing stage uses a synchronous time-division multiplexer for high-speed point-to-point transparent transmission. The multiplexer uses a simple tributary synchronization scheme based on positive and negative block justification, which combines the concept of controlled-slip and bit-stuffing techniques while maintaining information integrity. A generic CMOS LSI chip has been designed for use in the three-stage multiplexing system     

PTN网络删探讨

随着各种电信业务的IP化,分组传送网（PTN）将逐渐替代传统传送网。分组传送网以IP技术为基础,并融合了传统传送网的优点,是一个全新的网络。对分组传送网的技术进行了分析,并根据其技术特点,从网络结构、组网方式、业务等多方面进行规划,对分组传送网的建设提出了建议。     

Transport architecture evolution in UMTS/IMT‐2000 cellular networks

Mobile evolution from the second generation (2G) to the third generation (3G) raises several important questions for operators and manufacturers. How to ensure that the old and current investments can still be utilized in the future? What is the optimum architecture? ATM or IP? Voice or data? There is no single correct answer to these questions, as it all depends on individual cases. In this paper, we discuss the transport architecture evolution for the universal mobile telecommunications system (UMTS)/international mobile telecommunications—year 2000 (IMT‐2000), or 3G cellular networks and interworking aspects between 2G and 3G cellular networks. The interfaces between access nodes in a cellular network and the changes incorporated to support packet data services are described. Emerging services such as mobile data, virtual private networks (VPN) and location aware networking are described. Role of ATM and IP in this new transport architecture is presented. Control and data plane interworking issues between different transport technologies are described. The new ATM standard, ATM adaptation layer type 2 (AAL2) and its applicability for transporting compressed speech in an ATM based cellular network is described. A similar approach in IP, multiplexing in real‐time transport protocol (RTP) payload to transport compressed speech on selective interfaces of 3G network, is introduced. Transport network architecture evolution within four different scenarios is evaluated. Special interest is focused on the protocol stacks and flexible layered solutions that allow smooth migration from one transport technology to another. Copyright © 2000 John Wiley & Sons, Ltd.     

The application of optical packet switching in future communicationnetworks

Telecommunication networks are experiencing a dramatic increase in demand for capacity, much of it related to the exponential takeup of the Internet and associated services. To support this demand economically, transport networks are evolving to provide a reconfigurable optical layer which, with optical cross-connects, will realize a high-bandwidth flexible core. As well as providing large capacity, this new layer will be required to support new services such as rapid provisioning of an end-to-end connection under customer control. The first phase of network evolution, therefore, will provide a circuit-switched optical layer characterized by high capacity and fast circuit provisioning. In the longer term, it is currently envisaged that the bandwidth efficiency associated with optical packet switching (a transport technology that matches the bursty nature of multimedia traffic) will be required to ensure economic use of network resources. This article considers possible network application scenarios for optical packet switching. In particular, it focuses on the concept of an optical packet router as an edge network device, functioning as an interface between the electronic and optical domains. In this application it can provide a scalable and efficient IP traffic aggregator that may provide greater flexibility and efficiency than an electronic terabit router with reduced cost. The discussion considers the main technical issues relating to the concept and its implementation     

浅析分组传送网和传统MSTP网络混合组网

随着传统语音业务比重越来越弱化,数据业务的需求越来越多,各运营商网络建设都向分组网偏移。由于目前网络基数已经很庞大,部署分组网将是一个缓慢的过程,这就可能出现分组网与现有MSTP网络并存的情况,并有可能出现混合组网。分析了分组网和传统MSTP网络各自的特性,并基于各自不同的原理,对两种网络的融合方式、对接提出了不同的思路,并讨论其优劣性。