LTE核心网与PTN组网方案研究

研究了LTE核心网集中部署时PTN网络的组网方案,在此基础上分析了未来LTE核心网规模扩大局点分裂或下沉后PTN网络可能的组网演变,以期为LTE核心网与PTN承载网的合理组网提供借鉴。     

网络技术的发展方向（上）

本文讨论了网络的分代和第四代网络的组网技术和网络技术,提出网络技术的发展方向是第四代网络,给出了第四代网络的技术方向。     

WDM光网络关键技术研究

信息爆炸导致了对带宽的无限需要,而波分复用（ＷＤＭ）系统在满足不断增长的带宽需求的同时还具有不可比拟的联网优势,文中着重研究了ＷＤＭ光网络的关键技术。     

物联网的特征、内涵、发展策略和挑战

本文首先论述了物联网的内涵、体系架构及其战略意义.然后,讨论和分析了物联网的市场空间、行业特征和运营商在产业链中的定位.接下来,文章分析了物联网的流量分类特征、对于网络的影响以及物联网的核心技术.最后探讨了物联网的发展策略、主要挑战及其可能的未来.     

内容推送和路由扩散相结合的内容源移动管理优化方案

在内容中心网络(Content Centric Networking,CCN)中,消费者请求按照原有转发路径无法成功交付移动内容源,兴趣包丢失率高;为保证移动内容源的可达性,则需要对全网路由器进行路由更新,这将造成巨大的更新开销.针对上述问题,提出内容推送和路由扩散相结合的内容源移动管理优化方案.与现有CCN内容源移动...     

Can energy optimization lead to economic and environmental waste in LPWAN architectures?

As low-power wide-area network (LPWAN) end devices (EDs) are deployed in massive scale, their economic and environmental costs of operation are becoming too significant to ignore and too difficult to estimate. While LPWAN architectures and protocols are designed to primarily save energy, this study shows that energy saving does not necessarily lead to lower cost or environmental footprint of the network. Accordingly, a theoretical framework is proposed to estimate the operational expenditure (OpEx) and environmental footprint of LPWAN EDs. An extended constrained optimization model is provided for the ED link assignment to gateways (GWs) based on heterogeneous ED configurations and hardware specifications. Based on the models, a simulation framework is developed which demonstrates that OpEx, energy consumption, and environmental footprint can be in conflict with each other as constrained optimization objectives. We demonstrate different ways to achieve compromises in each dimension for overall improved network performance.     

大规模以数据为中心的网络架构下基于拓扑的数据分发机制(英文)

Massive information flows are generated from interactive processing and visualizations.To efficiently support information transmission over the Internet,information centric architecture has been recently proposed.In this paper,we consider an information centric architecture,called the data centric networking architecture to provide communication services to big data,where a service identifier is used to name the data objects.We propose different approaches for the dissemination of data objects in a large-scale data centric network.In particular,we propose various approaches to link the data dissemination approach with the topology of the Internet.Further,we evaluate the proposed approaches with respect to data delivery efficiency,round-trip time improvement,and deployment cost.Based on the results obtained from this study,it can be shown that by disseminating data objects to small ISPs,the data delivery efficiency can be significantly improved within an acceptable deployment cost.     

桥梁索力测量无线组网系统

设计实现了一种基于Zig Bee无线组网的桥梁索力测量系统。该系统采用TI公司的CC2530芯片组建无线数据传输网络,采用MEMS传感器对桥梁多个拉索进行布点,用STM32芯片组成控制处理模块,实现一次性同步得到桥梁多拉索的索力数据,解决了桥梁监测数据采集麻烦问题。该系统具有节点功耗小、传输距离远、组网容易、成本低、网络容量大等优势,现场应用实验效果较好。     

车联网中基于联盟合作博弈的带宽分享策略

近几年来,车联网领域快速发展并引起广泛关注.在此背景下提出了一种混合Wi-Fi、WiMAX和3G/LTE的网络架构,在这种架构下,车辆可以根据自身的情况选择合适的方式接入网络.网络带宽分享采用基于联盟合作博弈的方式,车辆可以选择加入或离开合作联盟来最大化自身收益.模型从理论上证明了通过车辆间的效用分配与博弈合作,最终将形成一个纳什稳定的联盟划分并能适应车辆的动态变化.仿真结果表明,模型的算法性能接近于最优联盟分配.     

网络虚拟化互通技术

工业界和学术界提出了许多新的网络虚拟化技术来满足云计算环境对网络服务的需求.网络虚拟化技术的多样化使得云环境面临多种网络虚拟化技术共存的状况.然而,网络虚拟化技术间的差异会导致网络资源被分割成相互间不可通信的“孤岛”.为了解决这个问题,提出了网络虚拟化互通技术,分析了该技术的实现难点,并提出了基于软件定义网络的网络虚拟化互通架构Omni-Bridge,最后给出了Omni-Bridge的原型实现和功能验证.