Pacific Bell's network and systems concept of the 90s

An overview is given of a concept developed by Pacific Bell of integrating the functionality of its service-carrying network and its operational support systems to serve its customers needs in the 1990s, economically and effectively. The concept is called network and systems concepts of the 90s, or Netsys, for short. The concept serves as a focal point for network systems and operations planners by providing a common conceptual reference from which strategies can be developed     

Broad-band ATM network architecture based on virtual paths

Broadband transport techniques and network architectures based on the virtual path concept are examined. ATM (asynchronous transfer mode) techniques, when coupled with recent technological innovations, are expected to pave the way for future universal transport networks. The virtual path concept, which exploits the ATM's capabilities, is proposed to construct an efficient and economic network. The concept matches current and anticipated technological trends well. Characteristics and implementation techniques of virtual paths are discussed. Advantages of the virtual path concept and its impact on the transport network architecture are demonstrated. The virtual path strategy is also shown to provide efficiently for networks with dynamic reconfiguration capability which will enhance network performance. Some basic analytical results on the dynamic control effects of virtual paths are provided     

基于概念网的本征特征提取

随着网络技术的发展,网络舆情分析越来越受到人们的重视。长期以来,应用于网络舆情分析中的文本分类和聚类技术都是以词作为最小的分析单位,很难把握词语之间的关系。介绍了舆情分析的核心体系,即基于概念网络提取文本本征特征,可以有效提高网络舆情分析准确度,利用概念消歧的方法,将文本映射成为概念网络中的概念,以义元作为最小的表达概念的单位,利用统计方法将高权重的义元集合作为文本本征特征。     

自动交换光网络的体系结构

自动交换光网络的出现是传送网概念的重大历史性突破，本文首先阐述这种新传送体制的基本概念和发展，然后介绍其控制面的功能要求，信令及相关接口，选路和信令网，控制面结构，网络性能要求等总体问题的规范和考虑，最后论述IP层与光传送层的融合以及两种基本网络演进结构的特点。     

机会网络编码路由协议性能分析与研究

首先引入机会网络的概念以及相应的基础理论知识,包括机会网络的体系结构、通信模式及一些经典的路由协议,然后主要介绍了网络编码的基本概念和原理,重点描述了线性网络编码方法及基于此的高效路由协议,最后对机会网络基于编码路由协议未来发展前景进行了展望。     

SDN技术和产业分析及运营商应对策略建议

软件定义网络（SDN）提出了一种全新的网络设计理念,强调控制与转发的分离以及网络的可编程,实现网络架构的开放。SDN正和云计算一道重塑互联网网络模型和产业结构。介绍了SDN的基本概念、本质及特征,分析了SDN核心技术体系及其产业发展现状,从运营商视角探讨了SDN对未来网络的影响,并给出了相应的应用建议。     

智能光网络的发展与演进结构

智能自动交换光网络的出现是传送网概念的重大历史性突破。首先阐述这种智能光网络体制的基本概念 ,然后介绍其控制面的功能要求、传送资源及其组织、控制面结构、网络性能要求等总体问题的考虑 ,最后论述 IP层与光传送层的融合以及两种基本网络演进结构的特点     

Significance of Equipment Reliability in a Telephone Network

A reliability concept is considered in which telephone traffic is taken into account for a telephone network. An analytic model of a simple network with parallel paths shows how telephone traffic is included in the telephone network reliability analysis. Examples are given to demonstrate the usefulness of this concept in the investigation of an optimum inspection policy for each path, and the effects of path age and failure rate on telephone network service.     

An Algebraic Approach to Link Failures Based on Network Coding

In this correspondence, we investigate the link failure problem based on the recent results of network coding. We propose a concept, named capacity factor of a network, which is the minimum link set that can influence the network capacity, as our basic tool. We define the capacity rank to each link of the network to characterize its criticality and present the concept of the p-stable network. Based on these notions, an upper bound for the capacity factor size is derived and a family of p-stable networks is constructed     

移动通信核心网的演进

本文介绍了全IP核心网的概念以及无线网、骨干网、信令网的演进。     

四值贝叶斯网络诱导的内积空间

结合贝叶斯网络与核函数,通过概率分布等价性的转换,分析了四值贝叶斯网络诱导的内积空间,得到无连接、全连接以及k个节点具有一个父节点的特殊四值贝叶斯网络诱导的内积空间的最低维数。为进一步研究多值贝叶斯网络诱导的内积空间开辟了新途径,还通过分析概念类的VC维确定了其欧几里德维数的下界。VC维还可用于估计贝叶斯网络概念类的复杂性和判断概念类的分类性能。     

Passive filterless core networks based on advanced modulation and electrical compensation technologies

In this paper, the filterless optical network concept is presented and explored through a number of filterless solution examples. In the first part, the filterless network concept is presented and analyzed through a comparative case study. In the second part, the filterless network design problem is defined and a filterless network design tool based on metaheuristics is presented. In the third part of this presentation, filterless network solutions are proposed for a number of core network topologies and compared to active photonic network solutions from the point of view of cost and performance. The results show that cost-effective filterless solutions can be found for different network sizes and topologies. The results of a comparative study show that filterless networks represent a cost-effective and reliable alternative to active optical switching network solutions.     

基于NFV的移动网络新型架构与关键技术研究

网络功能虚拟化技术在实现网元软件功能与专用硬件设备解耦的同时,驱动了移动网络架构设计方法的创新。本文提出一种基于虚拟化网元功能重构思想的网络架构设计思路,重新定义了与接入无关的统一控制平面和全局扁平的传输平面。新型架构方案具备以用户为中心、全局数据流路由优化、多接入系统融合、网络功能开放可编排等特性。     

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。     

基于概念网络的文本信息监控技术

由于网上信息的迅速增长,文本信息监控已经成为网上信息管理中的热点研究课题。本文在模糊集和语义网络的理论基础上,构建了模糊值动态约束性概念网络,介绍了该概念网络的基本构建方法,并提出了基于概念网络的文本分析算法。     

讯号对网络的匹配及其应用

本文提出了讯号对网络匹配的概念,在分析某些微波网络时应用这一概念,可使问题简单明了。文中给出了一个应用实例。     

SDH传送网结构

本文介绍了ＳＤＨ传送网结构的基本概念、网络结构元件、网络的分层和分割以及ＳＤＨ传送网分层模型。最后还提出了我国ＳＤＨ的网络拓扑结构的初步考虑。     

计算机网络安全问题与防范方式

主要从计算机网络安全概念、计算机网络安全防范必要性、计算机网络安全中常见的安全问题及计算机网络安全防范方式等方面,对计算机网络安全问题和防范方式进行相应研究。     

省本地传输网的现状及其发展

从本地传输网的概念入手，分析现有传输网存在的问题、业务需求特点、新技术对本地传输网的影响，提出本地传输网建设的若干观点。     

QoS control in the 3GPP evolved packet system

In this article we describe the QoS concept of the evolved packet system, which was standardized in 3GPP Release 8. The concept provides access network operators and service operators with a set of tools to enable service and subscriber differentiation. Such tools are becoming increasingly important as operators are moving from a single to a multi-service offering at the same time as both the number of mobile broadband subscribers and the traffic volume per subscriber is rapidly increasing. The ?bearer? is a central element of the EPS QoS concept and is the level of granularity for bearer-level QoS control. The network-initiated QoS control paradigm specified in EPS is a set of signaling procedures for managing bearers and controlling their QoS assigned by the network. The EPS QoS concept is class-based, where each bearer is assigned one and only one QoS class identifier by the network. The QCI is a scalar that is used within the access network as a reference to node-specific parameters that control packet forwarding treatment. This class-based approach, together with the network-initiated QoS control paradigm, gives network operators full control over the QoS provided for its offered services for each of its subscriber groups.