高带宽业务需求与宽带网络的演进

文章首先分析了中国、国外宽带接入的发展现状,然后分析各种宽带业务对网络带宽的要求,并结合公众客户、政企客户的带宽需求,对目前主要的固网宽带接入技术进行了分析与比较,指出带宽需求与网络能力的辩证关系;提出网络能力应适度超前用户的带宽需求;最后总结了推动宽带发展的思路。     

Reducing Channel Capacity for Scalable Video Coding in a Distributed Network

In recent years, the development of multimedia devices has meant that a wider multimedia streaming service can be supported, and there are now many ways in which TV channels can communicate with different terminals. Generally, scalable video streaming is known to provide more efficient channel capacity than simulcast video streaming. Simulcast video streaming requires a large network bandwidth for all resolutions, but scalable video streaming needs only one flow for all resolutions. In previous research, scalable video streaming has been compared with simulcast video streaming for network channel capacity, in two user simulation environments. The simulation results show that the channel capacity of SVC is 16% to 20% smaller than AVC, but scalable video streaming is not efficient because of the limit of the present network framework. In this paper, we propose a new network framework with an SVC extractor. The proposed network framework shows a channel capacity 50% (maximum) lower than that found in previous research studies.     

On the mobility/capacity conversion in wireless networks

Given a quality-of-service constraint, a wireless network has to sacrifice its capacity in order to support an increase in mobility. In other words, the network needs to convert some of its capacity into mobility. We develop an analytical model to evaluate the efficiency of the mobility/capacity conversion processes of several wireless networks. One practical implication of our results is that a network, if designed correctly, should have a free convertibility between the two.     

WCDMA高负载影响网络质量的研究与优化

研究WCDMA话务容量模型,推算网络承载能力,探索网络负载与网络质量的关联因素,提出负载与容量平衡的优化方法,总结密集城区网络容量、质量、监控和优化流程,实现良好网络质量下无线资源的合理利用,最大程度满足用户需求。     

All the animals in the zoo: the expanding menagerie of opticalcomponents

Diverging optical network requirements are driving innovations in optical components in multiple directions. The telecommunications network core needs new components to increase capacity while reducing cost: optics that enable faster line rates, more wavelengths per fiber, and longer spacing between repeaters. Metro networks need components to handle complex traffic patterns. A desire for network reconfigurability in both long-haul and metro segments drives demand for switches, but also for other associated components to condition signals after switching. The next generation of optical transport equipment will rely on new types of optical components to perform functions that do not yet exist in the network     

WCDMA高负载影响网络质量的研究与优化

研究WCDMA话务容量模型,推算网络承载能力,探索网络负载与网络质量的关联因素,提出负载与容量平衡的优化方法,总结密集城区网络容量、质量、监控和优化流程,实现良好网络质量下无线资源的合理利用,最大程度满足用户需求.     

基于业务预测与聚类分析的网络疏忙评估方法

随着不限量套餐的推广,移动用户的业务结构发生了巨大变化,音乐、短视频等业务的流量冲击给运营商网络带来的压力亟待缓解。针对这一问题,提出了一种容量管理方案,运用业务预测方法,充分考虑实施提前量,预估网络业务量发展趋势;进一步根据预估业务量及网络配置情况划分业务场景,通过聚类分析,实施差异化的疏忙手段。工程实践表明,该方案能够有效缓解现网容量问题,大大提高了容量建设的精准性,并且具有良好的时效性。     

IEEE802.11 DCF容量分析与讨论

本文介绍了IEEE802.11DCF(分布式协作功能)及分析其容量的3种方法,根据分析及仿真结果重点研究了网络容量与活跃结点数的关系,表明活跃结点数过多或过少时网络容量不理想的主要原因是当前所采用退避算法本身的局限性所致,退避算法仍需进一步改进。     

基于指标分析与容量消耗测试的WCDMA无线网络扩容方法探讨

中国联合网络通信有限公司深圳分公司(以下简称深圳联通)在研究传统无线网络扩容方法的基础上,提出了一套基于指标分析与容量消耗测试的WCDMA无线网络扩容方法,并按照这套方法进行了2011年的扩容规划。该扩容方案的实施证明,该方法能够准确、有效地满足业务发展的需求,为市场的进一步拓展提供有力的网络保证。     

Mesh-Restorable Networks with Enhanced Dual-Failure Restorability Properties

We consider extensions of the most common mesh-restorable network capacity design formulation that enhance the dual-failure restorability of the designs. A significant finding is that while design for complete dual-failure restorability can require up to triple the spare capacity, dual failure restorability can be provided for a fairly large set of priority paths with little or no more spare capacity than required for single-failure restorability. As a reference case we first study the capacity needs under complete dual-failure restorability. This shows extremely high spare capacity penalties. A second design model allows a user to specify a total capacity (or budget) limit and obtain the highest average dual-failure restorability possible for that investment limit. This formulation, and a relationship between dual-failure restorability and availability, can be used to trace-out the capacity-versus-availability trade-off curve for a mesh network. A third design strategy supports multiple-restorability service class definitions ranging from best-efforts-only to an assurance of complete single and dual-failure restorability on a per-demand basis. This lets a network operator tailor the investment in protection capacity to provide ultra-high availability on a service-selective basis, while avoiding the very high investment that would be required to support complete dual-failure restorability of the network as a whole.     

OTN业务和现有SDH传输网的有效结合探讨

在现代发展过程中,在经济与科技高速发展的背景下,我国运营商在传输网上面的建设取得了突破性的发展,建设规模逐渐增大,同时网络质量也得到极大的提高,为了加强业务能力,满足大众的需求,还需要将网络朝扁平化方向发展,考虑以往传输网结构构成,结合实际需求,改变传输网内部结构,提升承载层的渗透能力,以下将对传输网进行讨论,并围绕OTN业务与SDH传输网有效整合进行论述。     

面向5G大容量业务的超高速传输标准及技术探讨

本文从5G网络对传送网需求分析及技术标准出发,将提高线路传输速率、提升系统传输容量、软件定义光网络、光网络模块的新型应用、光网络安全保障等5个方面作为超高速传输技术的探讨方向,旨在满足5G时代大带宽、高容量和低时延的业务需求。     

固定宽带无线接入系统LMDS的扩展性研究

随着人们对多媒体业务需求的不断增长,网络容量也必须随之增长,以满足人们的需求。本地多点分配业务(LMDS)是一种新兴的宽带无线接入技术,其初期投资小,后期扩容能力强,业务扩展余地较大。文章从小区规划、调制方式、多址方式、频率优化和极化等方面对LMDS的扩展性进行了详细的分析,有助于部署一个具有高度扩容潜力的LMDS网络,同时也为LMDS网络系统的扩容起到了积极的作用。     

WLAN无线接入网络规划及其网络性能优化研究

随着WLAN无线的发展,其覆盖区域、用户量、网络容量不断增加,使其接入网络规划的问题逐渐成为建设公共无线局域网的重要问题.同时,对WLAN无线接入网络性能优化是满足用户需求的关重要手段,网络性能优化主要有覆盖优化、容量优化、设备优化.     

The noise and crosstalk environment for ADSL and VDSL systems

This article provides an overview of the noise and, in particular, the crosstalk environment in which DSL technology needs to operate. Transmission on the copper access network is subject to impairments which limit the achievable information capacity, and there is an urgent need to ensure that all DSL systems are spectrally compatible if the capacity of the network is to be fully realized. This article discusses the principles of frequency planning in copper access networks that help to ensure compatibility of deployed systems     

分组传送网络规划与设计

分析了分组传送网络规划设计的需求和基本流程,并着重探讨了PTN规划设计中网络拓扑、业务路由、网络配置及网络容量等各关键环节的规划方法及策略。     

关于数据网技术的思考

回顾了数据网的发展史和标准化史,提出未来网络的分代发展理念。指出网络设计存在两条技术路线:以用户和业务应用为核心的发展技术路线,根据用户和应用需求逐步增加网络能力;以网络为核心和能力责任主体的发展技术路线,网络分代研究,网络能力"代"内稳定,无须频繁修改和增添。网络5.0(即第五代网络)采用的是"以网络为核心的设计理念",给出了网络5.0的3项重要能力详细论述,分别是:内生可信和安全,内生的网络资源感知、调配和管控,内生网络性能和能力确定性。     

FDD900M承载及语音质量提升技术研究

随着5G建设的开展,4G频段部分重耕作为5G使用导致4G可用频段减少,与此同时,用户对高速移动数据业务的需求持续增长,频谱资源有限问题性日益严峻.结合网络发展趋势,FDD900M作为后续将长期使用的4G频段,需重点提升其业务承载能力.本文探究FDD900M承载提升整体处理流程,主要着眼于参数优化和干扰优化,提出个性化优...     

全业务运营背景下的高校区域网络建设方案

本文研究了全业务运营背景下的高校区域网络建设方案,通过对高校区域客户及业务需求进行分析,对各业务接入网络容量进行了规划分析,并在此基础上制订了高校区域各业务网络建设方案。     

面向5G的核心网演进

5G 致力于“信息随手至，万物触手及”的愿景。5G 网络采用场景化设计，以更加灵活的方式满足多样化的业务需求。基于面向5G的核心网目标架构，从网络设备形态、组网架构、网络和业务能力及网络管理编排等方面分析了网络演进中的问题。遵循“网络架构布局一步到位、网元功能平滑升级演进、容量流量逐步迁移调整”的原则，给出了不同时期5G演进策略建议。