内容中心网络中安全问题研究综述

内容中心网络( CCN)是一种革命性的网络架构,采用内容路由、网内缓存等技术来提高网络中的内容分发效率,但其自身的结构特点使之面临很多的安全问题。通过对CCN网络工作机制的研究,分析了CCN面临的非授权访问、隐私泄露、泛洪攻击等安全风险;然后,总结了每种安全风险的解决方案及各自优缺点;最后,展望了未来的研究方向。     

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。     

信息中心网络体系结构研究综述

互联网应用需求逐渐转变为信息的分发和获取,而网络体系结构依然为主机间的端到端通信,二者矛盾日趋尖锐。信息中心网络（Information-Centric Networking,ICN）采用以信息为中心的设计为解决上述问题提供了新思路。本文提出了ICN的基本体系结构框架,从功能和特性两个维度探索了ICN可能的设计空间,然后讨论了ICN与其他未来网络技术的关系以及ICN实验平台和部署,最后指出当前主要问题及下一步研究方向。     

TD-LTE与LTE FDD融合组网策略

随着移动互联网的快速发展以及4G网络规模的急剧扩大,全球范围内的频率资源日益稀缺.借鉴TD-LTE与LTE FDD融合发展的成功经验,对融合组网策略和TD-LTE国际化发展面临的挑战进行了分析,提出了TDD与FDD共平台融合组网的发展模式和策略,并对通信运营商网络的未来发展提出了针对性的建议.TD-LTE与LTE FDD融合组网已成为大趋势,LTE融合组网的方式作为通信运营商的重要战略布局,应该提前在LTE总体规划中予以考虑.     

SDN试验床网络虚拟化切片机制综述

未来网络体系架构和关键技术的研究需要灵活开放的测试验证环境,基于传统分布式的网络架构难以达到动态虚拟化、有效管控和新协议灵活部署的需求。随着软件定义网络（SDN）技术的出现和发展,上述问题找到了有效的解决途径,因此,基于SDN构建网络试验床成为了近年来该领域的主流研究方向之一。其中,基于SDN的网络虚拟化切片技术更是试验床中的核心支撑技术,可以根据不同试验的需求切分物理网络资源,从而提供并行、独立的网络环境。将重点研究基于SDN的试验床中使用的网络虚拟化切片机制,从“流量识别和切片网络标识”、“虚拟节点抽象”和“虚拟链路抽象”这3个关键技术出发,对当前基于SDN试验床中的典型网络虚拟化切片机制进行介绍与分析,并总结了该领域未来可行的研究方向。     

On elastic traffic via contention resolution diversity slotted aloha satellite access

This paper presents a performance study relative to the coupling of the Transmission Control Protocol (TCP) with the Contention Resolution Diversity slotted aloha (CRDSA) protocol, in the case of greedy TCP connections (also called elephants) on Digital Video Broadcasting‐Return Channel via a geostationary satellite. CRDSA, which takes advantage of interference cancellation algorithms for collision/contention resolution, has already exhibited interesting performance when the power levels of all received bursts are perfectly balanced. In this paper, we extend the study to a more realistic case, where a certain spreading of the bursts' power levels is taken into account. The consequent capture effect even facilitates the collision resolution mechanism and yields an improvement in the overall TCP performance with respect to the balanced case. Furthermore, in certain conditions, the adoption of packet level forward error correction allows achieving even higher peaks of throughput than the expected ones. Copyright © 2014 John Wiley & Sons, Ltd.     

Dynamic switch migration towards a scalable SDN control plane

Distributed control plane is a promising approach to scalable software‐defined networking (SDN). Live migration of switches from controllers that are overloaded to those that are underutilized may be a solution to handle peak switch traffic using available control resource. However, such migration has to be performed with a well‐designed mechanism to fully utilize available resources in all three resource dimensions: CPU, bandwidth, and memory. In this article, we first provide a resource model for SDN and reduce the switch migration decision to a centralized resource utilization maximization problem under constraints of CPU, bandwidth, and memory. Second, we show that the problem of maximizing resource utilization in an SDN is equivalent to that of maximizing game players' profits in the context of non‐cooperative game theory. Taking controllers and switches as game players and commodities respectively, the player policy is how to migrate switches among the control plane. Finally, we implement a proof of concept, called GAME‐Switch Migration (GAME‐SM). The numerical experiments using Mininet emulator validate nice properties of our game model in enhancing the performance of control plane in SDN. Copyright © 2016 John Wiley & Sons, Ltd.     

Design and Realization of a Novel Header Compression Scheme for Ad Hoc Networks

IP header compression schemes offer a valuable measure for bandwidth preservation. Such schemes have been practically implemented in infrastructure‐based IP networks for point‐to‐point links. However, minimal research and practical implementation efforts have been conducted in the direction of an IP header compression strategy that can meet the peculiar requirements of multi‐hop ad hoc wireless networks. In this paper, we present a practically implemented multi‐hop IP header compression scheme using the Robust Header Compression (ROHC) protocol suite. The scheme runs on a novel identifier (ID) based networking architecture, known as an ID‐based ad hoc network (IDHOCNET). IDHOCNET additionally solves a number of bottlenecks of pure IP‐based ad hoc networks that have emerged owing to IP address auto‐configuration service, distributed naming and name resolution, and the role of an IP address as an identifier at the application layer. The proposed scheme was tested on a multi‐hop test bed. The results show that the implemented scheme has better gain and requires only O (1) ROHC contexts.     

数据链组网与数据传输仿真技术

研究数据链系统中的组网与数据传输技术,对于构建自主的数据链系统以及数据链系统的测试、评估极为关键。同时,进一步验证所设计的数据链系统的有效性、理解数据链的主要功能与性能参数,为进一步研究与设计测控数据链技术奠定基础。对数据链系统及数据链组网与数据传输技术进行了分析,并简要介绍不同数据链系统的组网与数据传输技术的差别,在此基础上提出一种数据链组网与数据传输仿真系统方案,对系统的功能和工作过程进行了分析,为数据链的构建、测试及评估提供支持。最后,对数据链及其测试评估系统构建及发展趋势进行了展望。该研究在数据链测试仿真评估系统中的验证效果良好,从而为数据链系统的设计提供了参考和依据。     

军事光纤通信发展对策研究

重点讨论对我国国防信息基础设施的体系结构发展有重大影响的热点技术,介绍了一个超级国防信息系统网络结构建议,以及它的网络功能和应用的军事意义