无线传感器网络关键技术及其研究难点

本文在简要介绍无线传感器网络特点的基础上,给出了无线传感器网络的体系结构,在此体系结构下,系统地阐述了无线传感器网络的研究现状,并指出了尚存在的难点和可能的研究方向.     

浅析城域光传输网络的规划和设计

介绍了城域光传输网络的基本概念和组网结构,归纳了浙江省城域光传输网的建设现状。以此为基础,简要地总结了城域光传输网从环状网络向网状网络的演进趋势以及城域光网建设的规划原则。     

网络体系结构分析和研究

本文首先简要概述了网络体系结构的现状及存在的问题,其次对未来网络体系结构与关键问题进行分析,并重点分析和研究了智能融合以及移动性资源管理与控制中的一些关键问题以及在研究方面的一些观点     

基于SDN架构的电信承载网和BNG设备演进思路

提出了一种新的承载网络架构,其最主要的特点是控制和承载分离.还根据当前软件定义网络（SDN）技术发展的水平、现有宽带网络网关（BNG）设备的实现以及电信承载网络自身的特点,提出了电信承载网和BNG设备向SDN架构演进的阶段性发展步骤,并对其中的一些细节进行了详细探讨.SDN网络的逐步部署必将加速互联网技术革新的步伐,为未来电信网络注入更多活力.     

SER‐Based Relay Selection for Two‐Way Relaying with Physical Layer Network Coding

To enhance the symbol error rate (SER) performance of the two‐way relay channels with physical layer network coding, this letter proposes a relay selection scheme, in which the relay with the maximal minimum distance between different points in its constellation among all relays is selected to assist two‐way transmissions. We give the closed‐form expression of minimum distance for binary phase‐shift keying and quadrature phase‐shift keying. Additionally, we design a low‐complexity method for higher‐order modulations based on look‐up tables. Simulation results show that the proposed scheme improves the SER performance for two‐way relay networks.     

IP协议的作用、问题与发展战略思考(上)

从IP协议的内涵、作用与外延的一系列问题讨论出发，进一步论述发展IP及NGN的理性战略思维。     

WCDMA无线网络优化的分析与研究

文章介绍了WCDMA系统优化的一般过程及其关键指标,详细研究和分析了WCDMA无线网络在覆盖、容量以及质量方面的优化办法。在覆盖方面,处理增益和接收比特能量与热噪声之比(E/N)是两个影响覆盖的主要因素,为了重点覆盖热点区域,可采用室内分布系统提高服务质量;在容量方面,讲述了容量与干扰量的关系及提高容量的最佳办法;在质量方面,第三代网络中必须考虑端到端的QoS,主要关注减少空中接口PS业务的时延。文章还讨论了WCDMA网络优化过程中的关键参数调整,其中主要包括切换参数、功率控制参数、接纳控制参数及分组调度参数。最后指出了WCDMA无线网络优化的重要性。     

Safety defect analysis and method study of data network

This paper cascades crash analysis and NS2 simulation analysis to study the network system hidden. It is combined with the theory of complex systems from the nodes and links in the network system vulnerability analysis. Firstly, we abstract complex network systems to the node and link network topology. And then we remove key nodes and link vulnerability analysis center between lines metrics to analyze the effect of the network functionality caused by node crashes or link crashes. Secondly, we construct a cascade collapse model, using NS2 simulation to study outside deliberate attack and simulation system failure analysis; and give the embodiment of cascading breakdown on the network function.     

Predicting the scale of information diffusion in social network services

Predicting the scale of information diffusion is an important task for many social network services (SNS) operators and enterprises. In this paper, the authors investigate the effects of two types of indicators, user attributes and social network attributes, and study on the accuracy of predicting the scale of information diffusion, and how to select an appropriate model that can fit real data better and have a higher accuracy. The experimental results show that both user attributes and social network structure attributes have significant effects on the scale of information diffusion. At the same time, three data mining models are constructed in this paper to predict the scale of information diffusion and compare their prediction accuracy. It is found that neural network model performs much better than decision tree and linear regression do.     

Long-Term Planning of WDM Networks: A Comparison between Single-Period and Multi-Period Techniques

This paper studies the long-term planning (e.g. a planning horizon of 2 to 5 years) of survivable WDM networks. The problem is formulated as a multi-period model that combines network topology and capacity expansion. The ability to determine network expansion schedules of this type becomes increasingly important to the telecommunications industry and to its customers. Two inherently different solution methods are presented: a sequential single-period approach, which designs the networks for every time period separately in chronological order, and an integrated multi-period approach, which considers all time periods at once. For each of these approaches, different network design cost models can be applied. Extensive simulations on a wide range of problem instances are carried out, to measure the influence of the applied network design cost model and to assess the cost savings that can be expected by opting for a multi-period planning approach instead of a sequential network design method.