互联网电视技术方案分析与比较

互联网电视作为一种新的内容服务方式正在快速发展。详细介绍了互联网内容传输技术发展历史,总结了互联网内容传输技术的3种方式。并针对目前国外主要的4种互联网电视技术方案(包括Apple,Microsoft,Adobe以及MPEG组织的互联网电视技术方案)进行了分析,重点研究了其中的关键内容、优势和不足。     

互联网面向连接的解决方案

本文针对当前互联网络面临的三大问题,论述了采用面向连接的技术的必要性.文章随后分析了互联网"控制与转发分离"以及新一代网络中使用面向连接技术的相关进展,在肯定这些架构的先进性的同时,指出了它们继续保留无连接服务的缺点.文章在上述架构的基础上建议了一个完全面向连接的互联网架构,并着重论述了这一架构在遏制远程的黑客攻击与病毒投放方面的有效性.     

未来网络之内容中心网络的挑战和应用

内容中心网络(CCN)是一种面向内容共享的通信架构.与传统基于IP地址的网络架构不一样,其可基于内容名字进行数据共享和交换,而不需要关心特定的物理地址和主机.采用发布/订阅传输模式和网络内置缓存,以存储换带宽,提高网络带宽利用效率.但该架构颠覆了现有互联网的基础,尚有很多问题亟待解决.重点介绍了内容中心网络的概念、特点、网络模型以及目前国际上的研究进展.尤其针对其面临的挑战和需要解决的关键问题进行了论述.同时,也列举了两个系统实现的样例,用以说明CCN的可行性和应用前景.     

广电智能融合内容分发系统的设计和建设

随着宽带网络的不断发展,以"爱优腾"为首的互联网内容提供商不断为用户提供高质量的视频节目,用户数量飞速发展;作为广电运营商应该尽快实施"互联网+",为用户提供高质量的服务.本文以江苏有线为例,介绍了广电在提供视频服务过程中遇到的问题和推流系统的演进过程,阐述了江苏有线广电智能融合内容分发系统当前以及后续的建设思路.     

内容中心网络中名字查找技术的研究

内容中心网络作为一种新型的未来网络体系架构被提出,以满足当前互联网信息共享的需求。内容中心网络使用类似域名的层次化名字结构对内容进行标识、路由和查找。由于互联网中内容众多,使用名字前缀构建的路由表,比传统的IP路由表大2~5个数量级,且由于名字查找依旧遵循最长前缀匹配原则,使得实现高速名字查找是一个富有挑战性的难题。分析了名字查找的技术挑战、实施难点,介绍了主要技术方法以及当前在名字查找领域的主要研究成果。     

中国移动CMNET网络结构演进探讨

为应对全业务运营和互联网竞争,CMNET网络需要进一步优化网络架构,明确城域网的定位,逐步实现CMNET网络的扁平化,提高CMNET骨干网的网络质量,为新业务承载做准备。本文主要结合互联网业务的发展趋势,探讨CMNET网络结构的发展。     

一种基于内容流行度的内容中心网络缓存概率置换策略

内容中心网络是下一代互联网架构的研究热点,该架构通过分布式内容缓存机制实现以内容为核心的数据传输,改变了传统基于主机的网络通信模式.缓存置换策略是内容中心网络的核心研究问题之一,缓存置换策略的设计优劣直接制约内容中心网络的数据传输性能.该文针对内容的流行度分布特征,提出一种基于流行度的缓存概率置换策略,并针对 L 层级联的内容中心网络(CCN),推导了该策略下的网络分层缓存请求失败概率近似计算公式.该文策略根据请求数据块的流行度而选择数据块在缓存队列中的置换位置,尽可能平衡不同流行度内容在网络中的分布.数值计算结果表明:该策略适用于内容请求集中的网络应用,相比较传统的最近最少使用(LRU)策略,该文策略可以明显改善流行度较低的网络访问性能.     

一种基于层次路由推送的CCN移动性支持方案

随着互联网的快速发展,用户对内容信息的需求日趋明显,当前网络架构的设计已经不能满足时下服务的要求,因此,以信息为中心的未来网络的研究得以迅速发展.内容中心网络（CCN）是未来网络的研究热点之一,然而现阶段CCN的设计未深入考虑用户移动性问题.本文针对CCN网络中的移动性管理问题,提出一种基于层次路由推送的解决方案.仿真结果表明,本文所提出的方法能有效降低用户获取内容的时间及网络中消息重传数目.     

中国移动互联网内容源引入探讨

随着互联网用户流量的快速增长,内容源在网内/网外将导致用户体验差别明显,且网间结算费用较高,互联网内容源已成为中国移动宽带业务发展的核心资源。文章对互联网内容源进行分类,分析中国移动内容源引入的内在和外在影响因素,阐明IDC(互联网数据中心)、Cache(缓存)、CDN(内容分发网络)内容源引入原则以及与CP/SP(内容提供商/服务提供商)在不同合作模式下内容源引入的实现方式,提出中国移动内容源引入的定量评估指标和定性评估依据。     

以内容为中心的新一代互联网体系架构研究

本文介绍了目前国际上关于下一代互联网的最新研究方向和热点——以内容为中心,并以其中的代表内容中心网络(CCN)为例,阐述了新一代互联网体系的基本架构和框架模型,同时对其他类似架构方案做了简单的介绍,希望能够引起国内相关主管部门和研究机构的重视,开展我国在相关领域的自主研究,尽快参与国际合作和竞争。     

A New HBS Model in Millimeter-Wave Beamspace MIMO-NOMA Systems Using Alternative Grey Wolf with Beetle Swarm Optimization

In recent years, content delivery accounts for a large proportion of the Internet traffic, but end-to-end communications used in the Internet mismatch content-centric delivery and lead to considerable delivery costs and latency. Taking the advantages of content-centric networking into account, we are motivated to employ the name-based mechanism to achieve content communications in the Internet and propose a content-centric framework in the Internet environment (CCFI). CCFI proposes a mapping mechanism between a unicast address and a name so that it can employ the name-based mechanism to achieve the following two objectives: (1) forward a content request to the nearest server in a unicast way; (2) support content sharing among multiple sources. Finally, CCFI is analyzed and evaluated, and the data show that it effectively reduce the content communication costs and latency.

     

以内容为中心的互联网体系架构研究

阐述以内容为中心的互联网体系架构相关解决方案,着重分析Named Data Networking(NDN)体系架构,并通过与DONA/PSIRP/4WARD等方案的对比,分析了以内容为中心的体系架构在命名机制方面的差异及架构存在的共性。     

A popularity based content eviction scheme via betweenness-centrality caching approach for content-centric networking (CCN)

Wireless Networks - In distinction to today’s IP-based, host-bound, Internet architecture, content-centric networking (CCN) emphasizes content by making it instantly addressable and routable....     

下一代内容分发网络及关键技术分析

针对电信运营商以不同业务应用的场景,各自建设内容分发网络(Conternt Delivery Network)的现状,从基于网络视讯框架的下一代IPTV的观点出发,为了降低运营商建设CDN的建设成本和维护成本,提出了不同业务的CDN应融合成为统一的下一代CDN架构,讨论了基于该统一架构下,需要突破的关键技术。     

CACTSE：基于云片式多终端协同服务环境的移动近场内容分发

Along with the rapid development of communications, the Internet, and smart terminals, mobile Internet has become a hot topic with both opportunities and challenges. In this article, a new perspective on edge content delivery service for mobile Internet is described, based on cooperating terminals. A mobile cloud architecture named Cloudlet Aided Cooperative Terminals Service Environment (CACTSE) is proposed as an edge network service environment. The Service Manager (SM), a cloudlet like module, is introduced into the local service domain in order to manage the in-domain terminals and help coordinate the content delivery requests for better bandwidth efficiency as well as user experience. The reference model is presented in this article with architecture and mechanism design. Moreover, the research progress and potential technology trends of CACTSE are analysed based on the related R&D directions.     

Content-Centric Networking for Mobile Networks

Wireless Personal Communications - Compared with the address-centric network such as the Internet, the content-centric networking (CCN) has a potential advantage in terms of content-centric...     

Modeling chunk-based content placement in information centric networking

Content-centric networking (CCN) proposes a content-centric paradigm which changes the waist hourglass from Internet protocol (IP) to content chunk. In this paper, based on content chunks, an optimization model of minimizing the total delay time in information centric networking (ICN) is established, and branch-and-bound method and greedy (BG) algorithm is proposed to get the content placement method. As the multipath is natural supported in CCN, chunk-based content placement can decline delay time obviously, even it would increase the calculation amount which can be solved easily by the node's capacity. Simulation results indicate that the chunk-based content placement scheme is better than the single-based cache policy on the network total delay time, and the best number of each content chunk split is decided by the link density and the number of the nodes in the network.     

Network Virtualization: A Viable Path Towards the Future Internet

New technologies as well as new ways of using network services are rapidly changing the Internet’s landscape. These developments will have far-reaching implications for the architecture of the networks of the future. However, the current Internet design is plagued with a number of fundamental limitations, which makes its use as the sole basis for the networking applications of the future questionable. We believe that the Future Internet must allow the co-existence of diverse network designs and paradigms, both new and old, to remain open to innovation and meet the challenges of the future. In this paper, we propose to use network virtualization, embedded in an architectural framework, to achieve this goal and to lay the foundation for the deployment of novel concepts such as content-centric networking.

In-network caching for energy efficiency in content-centric networking

Recently, Internet energy efficiency is paid more and more attention. New Internet architectures with more energy efficiency were proposed to promote the scalability in energy consumption. The eontent-eentrie networking （CCN） proposed a content-centric paradigm which was proven to have higher energy efficiency. Based on the energy optimization model of CCN with in-network caching, the authors derive expressions to tradeoff the caching energy and the transport energy, and then design a new energy efficiency cache scheme based on virtual round trip time （EV） in CCN. Simulation results show that the EV scheme is better than the least recently used （LRU） and popularity based cache policies on the network average energy consumption, and its average hop is also much better than LRU policy.