LTE PTN承载网建设思路浅析

为适应业务IP化,提高承载网带宽利用率,PTN替代MSTP网络成为目前中国移动3G承载网的主要方式。而随着LTE的到来,其对PTN网络提出一些新的需求,如大带宽需求、L3业务转发等。本文探讨PTN网络需要做哪些改变,以适应未来LTE的发展要求。     

LTE承载带宽在PTN网络中的控制策略研究

随着LTE无线技术持续演进,LTE双频组网迅速增加,对传送网尤其是接入网带宽需求迅猛增长。文章通过对LTE基站带宽需求的分析,研究了在PTN网络中承载LTE的带宽控制策略和分配模型,并对后续LTE后续部署的承载方式提出建议。     

LTE时代移动承载网演进中PTN的解决方案分析

随着移动互联网的发展及LTE时代即将来临,移动业务对承载带宽的需求激增,ALL-IP的承载架构已迫在眉睫,PTN正式走入现网,成为解决承载网瓶颈,实现分组传送的技术之一。本文就PTN设备的两种组网解决方案进行对比分析。     

浅析乡镇流量疏导解决方案

一、背景情况 随着LTE网络的大规模部署及多业务发展战略的推进,无线宽带化趋势越来越明显,IP化业务的承载需求成为主导。LTE业务对承载网的技术构架、承载效率、调度灵活性、服务质量等提出了新的要求。新的需求和挑战主要来自两个方面,一方面LTE回传网的网络更加扁平化,需要核心层P11N支持L3VPN来满足LTE业务灵活调度的需求;另一方面,LTE带宽需求快速增长,汇聚层10GE线路侧接口已无法满足LTE业务的带宽需求。特别是在LTE终端用户数提升后,基站的带宽需求将进一步提升。PTN网络带宽将面临巨大的挑战,如何进行网络平滑演进和带宽提速,将关系到全业务能否顺利开展。本文的主要目的是针对乡镇PTN网络汇聚层提出可行的带宽提升方案,将分散在各个乡镇的LTE流量和OLT流量安全高效的传送到核心层,确保网络的可持续发展。二、技术方案 方案一：10GEPTN叠加 方案描述：在现网10GE汇聚环基础上继续叠加10GE环路,增加PTN线路侧带宽,通过PTN网络进行基站回传、家庭宽带业务和大客户等高价值业务的承载。（1）通过在原有刚设备上扩容1个10GE端口同站址组环。（2）一张网架构,通过VPN实现多业务的隔离,带宽扩展性较差,距离受限。（3）该方案可以对PTN网络进行统一维护。（4）10GE产业链成熟,相关光器件成本较低,建网成本低。     

LTE承载网PTN建设方案

LTE是未来无线网络演进和发展的方向,PTN作为底层传输承载网的建设方案成为关注焦点,本文从LTE对承载网的影响入手,针对LTE网络架构变化,分析其传输承载的需求,对两种承载方案对比分析,提出LTE承载网PTN的建设方案。     

PTN+PTN6900 LTE承载解决方案研究

随着LTE网络的大规模发展,原有的PTN核心层网络（PTN+PTN3900）已不能满足业务发展需要,PTN核心层需要功能更强、设备容量更大以及高带宽端口密度更多的L3层才能满足业务发展需要。本文主要探讨了承载LTE业务的华为PTN设备组网研究,提出了SGW/MME本地市、异地部署方案;以及SGW、MME对接一系列解决方案,详细描述了PTN+PTN6900系列功能强大的核心层设备的组网方式,为后期大规模LTE发展提供了更完善、更低成本的移动承载网络。     

PTN L3组网承载TD—LTE业务的可靠性规划探讨

文章结合中国移动TD—LTE试验网深圳区域承载网规划建设的经验,首先简单介绍PTN支持静态L3的LTE承载解决方案和承载网PTN组网架构,然后在此基础上对PTN L3组网承载业务的可靠性规划展开深入探讨。     

烽火通信在中国联通PTN测试中表现优异

日前,烽火通信对外宣布,已率先完成广州联通HSPA+承载测试和PTN现网综合业务测试,测试结果验证了PTN分组传送网可以对现网的2G、3G、固网等多业务、以及HSPA+、LTE等提供完美承载。随着无线数据业务的迅速增长,用户对业务带宽、稳定性的要求不断提     

标准完善功能再提升PTN规模商用时代开启

PTN技术是国内各个运营商构建全业务承载网主流选择之一。中国移动等各大运营商联合设备厂商、标准研究机构积极推动并完善PTN在诸如OAM,多厂家互通等方面标准化的同时,进一步发掘PTN潜力,细致验证PTN承载LTE业务需具备的三层功能,并相继组织了大规模PTN承载LTE现网测试。本文主要结合PTN技术国内标准化和现网测试...     

面向LTE的综合承载网设计与分析

随着LTE的普及，世界迎来LTE应用的浪潮。LTE因其提高了频谱效率、架构扁平和低时延设计等特点，给用户带来了更好的体验。同时，随着LTE的变革，在LTE承载网的设计中也出现了多样的规划方案。因此，做好LTE承载网网络规划设计，建设一个大带宽、低成本、可扩容的LT E 传输承载网是至关重要。本文针对LT E网络架构特点及承载需求，对现有的面向LT E的承载网络进行了对比及分析。结合具体设备提供商，并考虑网络性能、业务承载需求、投资成本、功耗等多方面因素，提出了LTE承载网的目标架构，给出了一种PTN、IP-RAN融合的的承载网技术解决方案。     

Technology innovation and process integrations for sub-100nm gate patterning

This paper presents a brief overview of the Applied Centura(R)DPS(R)system,configured with silicon etch DPS Ⅱ chamber, with emphasis on discussing tuning capability for CD uniformity control. It also presents the studies of etch process chemistry and film integration impact for an overall successful gate patterning development. Discussions will focus on resolutions to key issues, such as CD uniformity, line-edge roughness, and multilayer film etching integration.     

White organic light-emitting devices based on fac tris（2- phenylpyridine） iridium sensitized 5,6,11,12-tetraphenylnap -hthacene

We have fabricated the white organic light-emitting devices （WOLEDs） based on 4,4＇ -bis（2,2 -diphenyl vinyl）-1,1＇ - biphenyl （DPVBi） and phosphorescence sensitized 5,6,11,12,-tetraphenylnaphthacene （rubrene）. The device structure is ITO/2T-NATA （20 nm）/NPBX （20 nm）/CBP： x%Ir（ppy）3：0.5% rubrene （8 nm）/NPBX （5 nm）/DPVBi （30 nm）/Alq（30 nm）/LiF（0.5 nm）/A1. In the devices, DPVBi acts as a blue light-emitting layer, the rubrene is sensitized by a phosphorescent material, fac tris （2-phenylpyridine） iridium [Ir（ppy）3], acts as a yellow light-emitting layer, and N,N＇ -bis- （1-naphthyl）- N,N＇ -diphenyl -1, 1＇ -biphenyl-4,4＇ -diamine （NPBX） acts as a hole transporting and exciton blocker layer, respectively. When the concentration of Ir （PPY）3 is 6wt%, the maximum luminance is 24960 cd/m^2 at an applied voltage of 15 V, and the maximum luminous efficiency is 5.17 cd/A at an applied voltage of 8 V.     

Complete approach to automatic identification and sub-pixel center location for ellipse feature

To meet the need of automatic image features extraction with high precision in visual inspection, a complete approach to automatic identification and sub-pixel center location for similar-ellipse feature is proposed. In the method, the feature area is identified automatically based on the edge attribute, and the sub-pixel center location is accomplished with the leastsquare algorithm. It shows that the method is valid, practical, and has high precision by experiment. Meanwhile this method can meet the need of instrumentation of visual inspection because of easy realization and without man-machine interaction.     

小角度扩展相关性近似算法分析

本论文提出一种在多天线MIMO信道相关性建模中小角度扩展近似理论算法,并应用于分析MIMO系统性能。分析中分别对三种不同角能量分布情况下的空间相关性研发快速近似计算法,并同时提出双模(Bi-Modal)角能量分布情况下的近似运算。通过分析这些新方法的近似效率,可以得到计算简单、复杂度低、而且符合实际的MIMO相关信道矩阵,对系统级的快速高效计算法的研究和系统级的评估以及误差分析具有重要的意义。     

A Versatile Mixed-Signal Pin Approach for Cost-Effective Test of Automotive ICs

Integrated circuits (ICs) intended for increasingly sophisticated automotive applications bring unique test demands. Advanced ICs for applications such as highly integrated automatic braking system (ABS) and airbag controllers combine high voltage digital channels, significant VI demands and precise timing capability. Along with continued missioncritical reliability concerns, the trend toward higher voltage operation and increased device integration requires specialized test capabilities able to extend across the wide operating ranges found in automotive applications. Among these capabilities, automotive test requirements increasingly dictate a need for a cost-effective versatile mixed-signal pin electronics with very high data rates reaching up to 50MHz with a voltage swing of-2 V to +28 V.     

Optical vibration and deviation measurement of rotating machine parts

It is of interest to get appropriate information about the dynamic behaviour of rotating machinery parts in service. This paper presents an approach of optical vibration and deviation measurement of such parts. Essential of this method is an image derotator combined with a high speed camera or a laser doppler vibrometer （LDV）.     

INTEGRATION OF OPTICAL AND WIRELESS NETWORKS

正For a long time,optical and wireless systems/net-works are developed in separate communities witha few attempts for in-depth convergence.In fact,it prom-ises many advantages to combine the optical and wire-less technologies in the levels of systems and networks.Recently,both academia and industry have made manyefforts to enter a new phase of development to take op-tical and wireless systems as fully integrated networks.To provide high bandwidth and reliable service for bothfixed and mobile users,a well-designed network must     

社长序言（英文）

正Happy New Year!As we step into a new year,we take a look back at the key feature topics covered in China Communications over the past 12 months and set out our expecta-     

云计算专题（英文）

正Cloud computing is a novel computing paradigm that utilizes remote cloud resources to achieve a high-performance computation.Cloud provides infrastructure,platform and software as different on-demand services.China has made remarkable progress in cloudbased products and operating system technology.The government,enterprises and research institutions are all active in the development of cloud computing-related projects.Despite the progress,many important problems     

Call for Papers—Feature Topic,Vol.12,No.3,2015

正Smart Grid Communications The electric power industry is undergoing profound changes as the industry aims to capture the promise of a smart grid for a sustainable energy future.Enabled by the advanced sensing devices such as Phasor Measurement Units(PMUs),increasingly powerful