英飞朗:光子集成技术促进节能降耗

英飞朗引入了一种全新的网络架构范式,称为英飞朗数字光网络,它具有快速安装和开通新业务、大幅降低成本和所需人员数量等显著洗势,并且在节能降耗等性能上对“绿色通信”进行了众多支持。     

光网OLT设备板卡资源的自动化稽核方案

光网时代,OLT设备资源管理与业务开通效率息息相关.为建立OLT设备资源的长效管理机制,实现对内提升精确管理水平、对外提升光网业务自动开通率的“双提升”目标,设计开发了OLT设备板卡自动化稽核平台.通过自动采集设备信息,比对设备侧与系统侧的资源数据,实现资源自动稽核,有效提升资源管理效率和用户业务开通满意度.     

基于云和大数据的光网络架构演进策略研究

现行光网络封闭的软硬件架构等问题与日益庞大的云和大数据应用矛盾日益尖锐,难于调和。在云和大数据的背景下通过引入SDN/NFV技术对光网络进行架构重构,跨行政区域并打破传统组网思路进行网络和资源的部署,建设转向以DC为核心的格局,形成基于SDN/NFV的"骨干光网络+城域光网络"两层扁平化网络架构,为未来光网络的演进提供参考。     

LTE网络分布式HLR规划方案研究

移动运营商要支持现网用户不换号开通LTE功能,必须要求现网HLR(归属位置寄存器)升级支持LTE-HSS(归属签约用户服务器),即HLR与LTE-HSS融合设置。考虑到数据融合的趋势以及分布式HLR的诸多优势,建议现网HLR设备采用分布式HLR,即采用FE+BE(前端设备+后端设备)的分层架构。文章结合前期HLR的特点,讲述分布式HLR的基本特点及部署的必要性,研究爱立信分布式HLR的FE、BE两个部分的组成和功能以及分布式HLR在某地运营的规划和维护方案。     

基于微信平台的居民出行调查小程序设计

居民出行数据是制定城市交通规划的重要依据。传统的问卷调查方式费时费力、样本采集率低、数据整理时间长、数据有效性低,成本高昂。结合“互联网+”思维,文章以居民出行问卷调查系统为研究对象,设计了居民出行问卷调查微信小程序平台及其管理平台。小程序采用基于云函数的分布式架构,管理平台采用B/S架构,使用MySQL数据库存储。文章重点介绍系统功能结构设计、总体架构以及小程序云函数架构、数据模型设计。     

上海“城市光网”用户破百万

近日。中国电信上海公司宣布,上海电信“城市光网”用户突破100万户,服务广大中小企业的“商务翼云”云计算平台正式开通。上海电信宽带用户410万,其中,光网用户突破100万,10兆及以上用户超过50万。上海电信表示,力争2011年内完成450万的光网用户覆盖,实现光纤入户130万。     

基于SOA的综合配置激活系统设计及价值分析

随着通信行业混业运营的不断加深,市场竞争日益加剧,为了抢占市场先机,快速的业务开通和高品质的网络服务质量成为当前运营商急需解决的难题.为了实现客户业务端到端的快速开通,提出一种基于SOA的网络数据配置激活方法,并利用该方法建设了网络数据的综合配置激活系统,实现了“一键式”端到端的业务开通,不仅大幅度提升了业务开通效率,同时避免了业务开通过程中人为的网络数据配置错误,不仅可以确保网络数据配置工作的准确率,而且提升了网络服务质量.     

英飞朗：光子集成技术促进节能降耗

英飞朗引入了一种全新的网络架构范式,称为英飞朗数字光网络,它具有快速安装和开通新业务、大幅降低成本和所需人员数量等显著优势,并且在节能降耗等性能上对"绿色通信"进行了众多支持.     

如何缩短FTTH业务局内外开通时长

本文阐述如何缩短FTTH业务局内外开通时长，介绍了专题分析挖掘各环节偏长的原因，采取相应的管控考核措施促进了FTTH开通各环节时长的缩短的方法。探索了通过分析五步法推动光网“畅快”的方法。     

“十四五”开新局 IDC需构建新格局

2021年是中国“十四五”发展规划开局之年,为建设创新型国家,全面支撑构建新发展格局,国家各部委,全国各省市都紧锣密鼓出台新举措。这里特别推荐业界人士关注学习。1月21日,北京市经济和信息化局发布《北京市数据中心统筹发展实施方案(2021-2023年)》(征求意见稿),提出推进数据中心从“云+端”集中式架构向“云+边+端”分布式架构演变。     

From network design to dynamic provisioning and restoration inoptical cross-connect mesh networks: an architectural and algorithmicoverview

This article presents a broad overview of the architectural and algorithmic aspects involved in deploying an optical cross-connect mesh network, starting from the network design and capacity planning phase to the real-time network operation phase involving dynamic provisioning and restoration of lightpaths and online algorithms for route computation. Frameworks for offline design and capacity planning of optical networks based on projected future lightpath demands are discussed. The essential components of an IP-centric control architecture for dynamic provisioning and restoration of lightpaths in optical networks are outlined. These include neighbor discovery, topology discovery, route computation, lightpath establishment, and lightpath restoration. Online algorithms for route computation of unprotected, 1+1 protected and mesh-restored lightpaths are discussed in both the centralized and distributed scenarios     

Layer 1 Virtual Private Networks in Multidomain Next-Generation Networks

High-capacity e-science and consumer applications require transport networks that are dynamically provisioned. Rapid advances in next-generation SONET/SPH and optical switching along with GMPLS control have enabled many new services' provisioning capabilities. In particular, a key paradigm is the new layer 1 virtual private network framework, which allows clients to directly provision their own services without deploying expensive infrastructures. This article presents an overview of L1-VPN and describes a resource management scheme that will enable transport network virtualization across a multidomain network infrastructure. The scheme is implemented in both centralized and distributed control frameworks, and allows for dynamic sharing of transport resources. A case study of performance analysis results is presented showing a distributed control plane in a multidomain network architecture achieving higher VPN carrying capacity than a centralized control plane     

On-line provisioning of network services

The authors review the telecommunications service-provisioning process. They describe a view of future service provisioning and discuss the issues and technical problems involved in online service provisioning. They explore how intelligent network elements in conjunction with distributed algorithms and distributed databases can be used to achieve this objective. The authors also present and describe a system architecture for the implementation of online service provisioning     

A resilient star-ring optical broadcast-and-select network with a centralized multi-carrier light source

This article presents a resilient star-ring optical broadcast-and-select network with a centralized multi-carrier light source (C-MCLS). It consists of a star part network and a ring part network. Optical carriers generated by the C-MCLS are broadcast to all network nodes, which select and utilize them for data transmission. Optical carrier distribution as well as data transmission and receiving are performed in the star part network. The ring part network is for fiber failure recovery. The network resilience property enables the design of a fast distributed failure recovery scheme to deal with single and multiple fiber failures. We introduce a fiber connection automatic protection switching (FC-APS) architecture that only consists of optical couplers and 1 × 2 optical switches for each network node. Based on the FC-APS architecture, we design a distributed failure recovery scheme to recover the carriers and data affected by fiber failures. The fiber failure detection and failure recovery operations are performed by each network node independently only using its local information. We evaluate the recovery time of the distributed failure recovery scheme compared with that of the centralized one. Numerical results show that the distributed scheme greatly reduces the recovery time compared to the centralized configuration in the recoveries of both single and multiple fiber failures. Optical power loss analysis and compensation of the recovery routes in the distributed scheme are also presented. We show the required number of optical amplifiers for the longest recovery route in the distributed scheme under different numbers of network nodes and fiber span lengths.     

An evaluation of distributed wavelength provisioning in WDM optical networks with sparse wavelength conversion

Distributed wavelength provisioning is becoming one of the most important technologies for supporting next-generation optical networks. This paper describes the evaluation of the performance of distributed wavelength provisioning in wavelength-division-multiplexing (WDM) optical networks with sparse wavelength conversion (i.e., where wavelength conversion is available at only a subset of network nodes). Using the well-known destination-initiated reservation method as a case study, a highly accurate analytical model supported by comprehensive simulation validation is proposed. Both analytical and simulation results show that, in optical networks with distributed wavelength provisioning, sparse wavelength conversion still helps to significantly lower the connection-blocking probabilities. However, unlike that in centralized wavelength provisioning, sparse wavelength conversion may not easily achieve nearly the same performance as that of full wavelength conversion, especially under light traffic loads. This paper evaluates how the potential contribution of sparse wavelength conversion depends on different factors, such as the number of wavelength converters, the number of wavelength channels per fiber, the burstiness of traffic loads, and the network size, and discusses the influence of the signaling scheme.     

A survey and comparative study of QoS aware broadcasting techniques in VANET

Mobile operators currently encounter numerous challenges caused by the centralized architecture of mobile networks. A single mobility anchor placed at the network core maintains the entire mobility and data traffic forwarding in the existing centralized mobility management (CMM) solutions. The CMM approach confronts several issues in scalability, reliability, signaling overhead, and non-optimal routing due to the increasing number of mobile devices and the volume of data traffic. To overcome these issues, a new architectural paradigm called distributed mobility management (DMM) is proposed to flatten the network architecture by moving mobility anchors closer to users and separating the control and data planes at the network edge. Two DMM solutions are developed: partially distributed mobility management (partial-DMM) in which only the data plane is distributed and fully distributed mobility management (full-DMM) where both control and data planes are distributed, which can be potentially applied for future mobile networks. This paper presents a network-based full-DMM scheme that was developed and implemented using NS2 network simulator by removing any dedicated centralized mobility anchor from the architecture. Extensive simulations were conducted to evaluate and compare the performance of the full-DMM model with that of the traditional CMM model. The simulation results show that the full-DMM provides lower end-to-end delay performance than CMM. However, the full-DMM generates higher handover latency and packet loss than CMM at high MN speeds. Moreover, simulation results clearly show the benefits of dynamic mobility activation in the full-DMM model.     

Scalable Quasi‐Dynamic‐Provisioning‐Based Admission Control Mechanism in Differentiated Service Networks

The architecture in a differentiated services (DiffServ) network is based on a simple model that applies a per‐class service in the core node of the network. However, because the network behavior is simple, the network structure and provisioning is complicated. If a service provider wants dynamic provisioning or a better bandwidth guarantee, the differentiated services network must use a signaling protocol with QoS parameters or an admission control method. Unfortunately, these methods increase the complexity. To overcome the problems with complexity, we investigated scalable dynamic provisioning for admission control in DiffServ networks. We propose a new scalable qDPM² mechanism based on a centralized bandwidth broker and distributed measurement‐based admission control and movable boundary bandwidth management to support heterogeneous QoS requirements in DiffServ networks.     

Capacity performance of dynamic provisioning in optical networks

This paper describes an architecture and analyzes the performance of dynamic provisioning of lightpaths in an optical network. In dynamic provisioning, a lightpath is set up in real-time without rearranging the working and protection routes of existing lightpaths, and without the knowledge of future lightpath provisioning events. This paper develops a general model of the physical topology of the optical network, and outlines routing approaches for dynamic provisioning of lightpaths. It analyzes via simulations the performance of dynamically provisioned unprotected, 1+1 protected and mesh-restored lightpaths. The analysis of the efficiency of network utilization of dynamic provisioning focuses on the spare capacity needed for protection, and in particular focuses on the impact of sharing of wavelength channels for mesh-restored lightpaths. The main conclusion from the performance studies is that significant capacity gains are achieved with sharing of wavelength-channels for mesh-restored lightpaths with dynamic provisioning even for sparse topologies, and even at moderate loads     

Smart OLT equipment of optical access network

A distributed architecture of optical line terminal(OLT) equipment is proposed for response to national bandwidth acceleration requirements and for future smooth evolution to 50G passive optical network(PON). This architecture moves the forwarding function of the control board to each service board to improve the switching capacity and performance of the system. The traditional control boards of centralized architecture OLT equipment have exchange and traffic processing function, and every servi...     

一种可部署在重路由光网络中实现有效连接管理的策略——基于分布式代理与蚁群算法

在大型骨干光网络中, 建立一条从源节点到宿节点的路由至关重要。在集中式网络管理系统体系下, 网络中动态路由信息以及故障状态信息, 通过路由的“泛洪”机制, 被传送到其他节点上实现资源信息共享,这对于连接的迅速建立, 恢复路由的快速启动将是不利的。尝试采用一种启发式算法-蚁群策略, 快速提高光网络中故障恢复的速度。该路由算法平台采用了分布式蚁群算法自动修复故障点, 解决了重路由的快速收敛问题; 依靠分布式代理机制构建管理平面和数据平面相互通信的机制, 完成诸如链路信息素的更新等功能。设计了一个网络故障的场景, 通过实验数据表明, 采用蚁群的分布式路由策略, 可以更快地实现路由信息的汇聚, 找到最佳的恢复路由。