基于神经网络的业务量预测研究

分别采用back—propagation（BP）算法和Favidon最小二乘学习算法训练神经网络（NN），并用于复杂业务流量预测。以自相似流量模型验证了2种NN学习算法的有效性，并分析比较了他们在流量预测中的可行性，得出Davidon最小二乘学习算法训练的NN比BP算法收敛速度快、收敛误差相差不多，验证了复杂自相似业务流的可预测性，为复杂自相似网络业务流预测的研究提供了一种有效途径。     

多网融合环境下网络管理技术的研究与实现

随着三网融合进程的不断加快,人们对异构融合网络的运营与管理提出了更高的要求。在多网融合的背景下,网络管理不仅仅需要考虑网络运营的"质",更要考虑网络与综合性业务控制平台系统的互通、代理分立网络的管理与控制数据服务集群的可靠性切换等问题。文章首先分析了多网融合背景下的业务控制平台的需求,然后针对性地设计实现了面向多网融合的网络管理系统。     

PTN流量预测及控制策略研究

PTN(分组传送网)是基于IP(互联网协议)技术的新一代分组光传送网技术,文章分别对城域PTN的核心层、汇聚层和接入层的流量预测建立了相应的数学模型,基于模型进行了流量预测和带宽测算,提出了PTN流量控制的相关策略,对于指导PTN的建设、运维期间的业务开通和业务配置工作有一定的参考价值。     

网络业务流模型综述

通信网络需要提供满足用户需求的QoS(quality of service)，这就需要业务流模型能准确地捕获实际业务流的统计特征。业务流模型在网络的流量控制及性能分析中都起至关重要的作用。随着网络业务类型不断增加，实际网络中业务流特性越来越复杂，表现为突发性、长相关性或自相似性等。这使得业务流建模方法的研究得到不断发展。文中就当前网络的业务流特性，分析了现有的业务流模型，并指出了这些建模方法的特点。     

炫彩多屏引领宽带新体验

三网融合时代,多屏合一成为新的潮流,上海贝尔新推出的多屏业务方案,为运营商带来新的盈利点。今年是中国三网融合的元年,真正跨越了通信网络、Internet和电视网络这三种异构网络的融合业务——＂多屏业务＂或＂三屏合一业务＂,通过三屏融合实现业务层面、控制层面和承载层面的完美融合。多屏业务是三网融合最典型的业务,它能随时随地地支持各种设备来访问个人的视频内容,给用户带来的是无缝的连接和无缝的播放感受。     

炫彩多屏引领宽带新体验

今年是中国三网融合的元年,真正跨越了通信网络、Internet和电视网络这3种异构网络的融合业务——“多屏业务”或“三屏合一业务”,通过三屏融合实现业务层面、控制层面和承载层面的完美融合。     

重尾ON/OFF源模型生成自相似业务流研究

因为传统模型没有考虑网络业务流量各种时间尺度都具有突发性,因此是不完善的,一系列的测量结果表明,网络业务流量显示自相似性,重尾分布ON／OFF模型能比较好地解释自相似业务流的产生原因,可以把LAN上的业务分解为多个活动（active)主机对之间的业务流,本文通过系统的仿真实验研究了重尾ON／OFF源模型生成自相似流的机理,并与理论结果进行了对比,而且补充了理论结果。     

VoLTE业务IP承载网潮汐流量预测模型建模与分析

随着运营商VoLTE网络用户数的不断提升及业务应用场景的不断丰富,业务流量也呈高速增长趋势。IP承载网作为VoLTE业务主要承载网络,面对业务的高速发展,网络拥塞及服务质量较低问题逐渐凸显,潮汐网络现象日益严重。针对VoLTE用户服务质量要求和合理的调配资源和负载需求,提出基于注意力机制的BP-ANN神经网络模型,并考虑对流量数据的时间上的相关性,实现对IP承载网流量的预测。仿真结果表明,流量预测准确率基本达到85%以上。     

PTN承载网业务规划

随着全业务的开展及基站IP化的逐步深入,分组化乃大势所趋,从核心网至接入网均向IP化方向发展,新的业务种类越来越多,业务类型正从单纯的TDM业务为主、2 Mb/s为颗粒向以数据业务为主、宽带接口过渡,城域传送网正面临着重新规划建设的繁重任务。分组传送网（Packet Transport Network）技术以分组为主要承载对象,将IP技术与传输网技术相融合,可实现对传统业务和各种新兴业务的统一承载,简要介绍了PTN的技术特点,重点分析了PTN承载网2G、3G主要业务的规划模型和原则。     

网络业务流的自相似性

对通信网络的大量研究表明,网络业务本质是自相似的(相关函数上表现为长相关特性)。网络业务的统计自相似性主要是指在不同时间尺度上观测到的业务流量序列具有相同的统计特性。讨论了当前网络业务流的特性;分析了现有的自相似业务流模型。为在线测量网络中的高速业务流,根据实测时间序列数据建立合适模型提供了参考。     

Analogy between data networks and electric networks

It is shown that two fundamental laws, Ohm's law in electric circuits and Little's theorem for queueing systems, are highly analogous. For both single nodes and networks, there is a striking equivalence between the two laws that facilitates the teaching and understanding of the related concepts of current flow in a resistor network and data flow in a communication network     

Noise relations of inverse active networks and complementary networks

A direct relation is derived to calculate the noise of an inverse active network from the noise of its pair. A similar relation for complementary networks is also derived. Applications of these relations are given.     

Relationships between probabilistic Boolean networks and dynamic Bayesian networks as models of gene regulatory networks

A significant amount of attention has recently been focused on modeling of gene regulatory networks. Two frequently used large-scale modeling frameworks are Bayesian networks (BNs) and Boolean networks, the latter one being a special case of its recent stochastic extension, probabilistic Boolean networks (PBNs). PBN is a promising model class that generalizes the standard rule-based interactions of Boolean networks into the stochastic setting. Dynamic Bayesian networks (DBNs) is a general and versatile model class that is able to represent complex temporal stochastic processes and has also been proposed as a model for gene regulatory systems. In this paper, we concentrate on these two model classes and demonstrate that PBNs and a certain subclass of DBNs can represent the same joint probability distribution over their common variables. The major benefit of introducing the relationships between the models is that it opens up the possibility of applying the standard tools of DBNs to PBNs and vice versa. Hence, the standard learning tools of DBNs can be applied in the context of PBNs, and the inference methods give a natural way of handling the missing values in PBNs which are often present in gene expression measurements. Conversely, the tools for controlling the stationary behavior of the networks, tools for projecting networks onto sub-networks, and efficient learning schemes can be used for DBNs. In other words, the introduced relationships between the models extend the collection of analysis tools for both model classes.     

Integrated networks that overflow speech and data between component networks

As cellular networks diversify by expanding the number of services, cell sizes, and generations of technologies supported, it becomes possible to overflow dual‐mode terminals using vertical handovers to other cellular networks or ‘component networks’. This study varies call placement algorithms, by defining, modeling, and evaluating Overflow and Return policies. Copyright © 2002 John Wiley & Sons, Ltd.     

Ad Hoc网络与无线传感器网络在电信中的应用

重点介绍Ad Hoc网络与其它传统通信网络相比具有的显著特点,这些特点使得Ad Hoc组网成为无线网络和移动计算领域最集中研究的热点,以及Ad Hoc网络在电信业的应用,除本身具有的重要价值外, 还具有大规模电信级服务.同时介绍无线传感器网络,介绍其特点,对WSN在电信中的应用前景进行分析.     

Self-aware networks and QoS

Novel user-oriented networked systems will simultaneously exploit a variety of wired and wireless communication modalities to offer different levels of quality of service (QoS), including reliability and security to users, low economic cost, and performance. Within a single such user-oriented network, different connections themselves may differ from each other with respect to QoS needs. Similarly, the communication infrastructure used by such a network will, in general, be shared among many different networks and users so that the resources available will fluctuate over time, both on the long and short term. Such a user-oriented network will not usually have precise information about the infrastructure it is using at any given instant of time, so that its knowledge should be acquired from online observations. Thus, we suggest that user-oriented networks should exploit self-adaptiveness to try to obtain the best possible QoS for all their connections. In this paper we review experiments which illustrate how "self-awareness," through online self-monitoring and measurement, coupled with intelligent adaptive behavior in response to observations, can be used to offer user-oriented QoS. Our presentation is based on ongoing experimental work with several "cognitive packet network" testbeds that we have developed.     

Evolutionary processes and networks

The paper deals with coevolution of different networks: it provides an approach based on evolutionary game theory. It examines the impact of learning and experimentation processes. It firstly yields results in a context where each agent directly interacts with all the other agents. Then it contrasts these results with the ones obtained when everybody only cares about the actions played by the agents in the neighborhood.     

Sustainability and community networks

Community networks are IP-based computer networks that are operated by a community as a common good. In Europe, the most well-known community networks are Guifi in Catalonia, Freifunk in Berlin, Ninux in Italy, Funkfeuer in Vienna and the Athens Wireless Metropolitan Network in Greece. This paper deals with community networks as alternative forms of Internet access and alternative infrastructures and asks: What does sustainability and unsustainability mean in the context of community networks? What advantages do such networks have over conventional forms of Internet access and infrastructure provided by large telecommunications corporations? In addition what disadvantages do they face at the same time? This article provides a framework for thinking dialectically about the un/sustainability of community networks. It provides a framework of practical questions that can be asked when assessing power structures in the context of Internet infrastructures and access. It presents an overview of environmental, economic, political and cultural contradictions that community networks may face as well as a typology of questions that can be asked in order to identify such contradictions.     

Multitrees and constrained networks

General counting formulas are given for the numbers of multitrees in a complete graph, and these are used together with a topological analysis procedure to reveal certain properties of the ideal transformer 4-terminal constraint.     

IP/MPLS网络与GMPLS网络互联的研究

文章研究了网际协议／多协议标签交换（IP／MPLS）网络升级为通用多协议标签交换（GMPLS）网络的过程中存在的几种演进模型，并重点分析了岛式模型。同时，还分析了MPLS网络和GMPLS网络互联时存在的问题、两种协议问的差异以及解决这些问题所采用的路由、信令和通道计算技术。