基于IPv6的无线传感器网络关键技术研究

基于IPv6技术的无线传感器网络是一门新兴的网络技术,人们对它的研究尚处于起步阶段。在此主要论述IPv6技术在无线传感器网组网应用,对使用无线与有线相结合的通信方法,通信协议和算法的研究,使得视频监控系统信号,通信系统信号以及检测系统信号在同一个通信平台上互不干涉的平稳的传输信息。就IPv6无线传感器网络与现有网络的互联互通方式,关键技术和算法等方面进行概述。     

IPv6无线传感器网络的研究及其应用

将IPv6与无线传感器网络技术结合起来的IPv6无线传感器网络引起了越来越多国内外研究机构与组织的重视。为了实现IPv6技术与无线传感器网络技术的完美融合,需要全面设计新型的无线传感器网络体系结构。文章充分考虑IPv6以及无线传感器网络的技术特点,提出IPv6无线传感器网络体系结构,并开发出一套适用于大规模无线传感器网络应用的嵌入式IPv6微型协议栈,在此基础上,根据实际应用需求,给出IPv6无线传感器网络与Internet互联的两种不同方式,并给出一个在精准农业生产中典型应用实例。     

Congestion control in wireless sensor and 6LoWPAN networks: toward the Internet of Things

The Internet of Things (IoT) is the next big challenge for the research community where the IPv6 over low power wireless personal area network (6LoWPAN) protocol stack is a key part of the IoT. Recently, the IETF ROLL and 6LoWPAN working groups have developed new IP based protocols for 6LoWPAN networks to alleviate the challenges of connecting low memory, limited processing capability, and constrained power supply sensor nodes to the Internet. In 6LoWPAN networks, heavy network traffic causes congestion which significantly degrades network performance and impacts on quality of service aspects such as throughput, latency, energy consumption, reliability, and packet delivery. In this paper, we overview the protocol stack of 6LoWPAN networks and summarize a set of its protocols and standards. Also, we review and compare a number of popular congestion control mechanisms in wireless sensor networks (WSNs) and classify them into traffic control, resource control, and hybrid algorithms based on the congestion control strategy used. We present a comparative review of all existing congestion control approaches in 6LoWPAN networks. This paper highlights and discusses the differences between congestion control mechanisms for WSNs and 6LoWPAN networks as well as explaining the suitability and validity of WSN congestion control schemes for 6LoWPAN networks. Finally, this paper gives some potential directions for designing a novel congestion control protocol, which supports the IoT application requirements, in future work.

     

IPv4/IPv6过渡的安全评估

近年来,由于Internet技术的迅猛发展,使得现在广泛使用的32位IP地址面临被用完的威胁,为此IETF 提出了下一代因特网协议(IPng)即IPv6,用来取代IPv4。本文介绍了IPv4/IPv6过渡技术的机制及过程,对各种IPV4/IPV6过渡技术的安全问题进行讨论,探讨了这些过渡机制安全方面的优劣、使用中的限制、应用方式及效果。     

IPv6业务发展前景与部署策略浅析

在IPv6网络上如何开展业务是目前互联网领域关注的重点之一,本文首先介绍了IPv6支持业务的基本能力和IPv6业务的发展现状,然后从下一代网络的角度探讨了IPv6协议和上层业务系统／平台之间的关系,最后提出了运营商在业务系统中逐渐部署IPv6协议的三种演进思路,即升级现有业务系统逐渐支持IPv6协议,实现不同网络层协议上的业务系统之间的互通,直接建设支持IPV4／IPv6的双栈业务系统,从而实现业务系统向IPv6方向的演进。     

基于6LoWPAN的IPv6传感器网络报头压缩方案的设计与实现

无线传感器网络节点的资源非常有限,如果能够对IPv6报头进行压缩可以在较大程度上减小数据传输量,提高IPv6传感器网络的整体性能。通过对6LoWPAN报头压缩方案的研究,并结合无线传感器网络的特点和实际需求,在已有无线传感器网络底层协议和基本IPv6协议栈基础上,设计并实现了一种支持对跳数限制压缩的IPv6报头压缩方法。实验结果表明,报头压缩可以有效节省网络能耗,降低丢包率,减小数据传输时延。     

一个无线传感器网络中的ipv6协议栈头部压缩方案

提出了一个无线传感器网络中的IPv6协议栈的头部压缩方案,包括IPv6头部、扩展头部和UDP头部的压缩.该方案易于实现,能够较大程度的减少无线传感器网络中报文的传输时间,从而降低能量消耗,延长节点寿命.     

无线传感器网络上轻量化的IPv6协议栈

传感器网络集成了传感器、微机电系统和网络三大技术是当今的热门研究领域之一,在农业领域控制、城市管理、环境监测等领域有重要的实用价值,具有十分广泛的应用前景。IPv6作为下一代IP协议正在逐步替代IPv4。无线传感器网络和IPv6的结合是当前研究的热点。本文基于轻量化IPv6协议栈为目的,通过分析IPv6报文以及无线传感器网络的特点,采用理论分析合理地提出了WSN中IPv6协议栈核心功能的剪裁方案。在试验中使用压缩的IPv6地址进行通信,得出一种适应于无线传感器网络运行的IPv6协议剪裁方案。     

基于P2P的无线传感器网络应用架构研究

通过基础网络互联多个传感器网络，为用户提供大规模、大范围、多样化的信息服务成为未来无线传感器网络的应用模式之一。据此，提出了一种基于P2P（Peer-to—Peer）技术的无线传感器网络应用架构。采用P2P技术，解决了大数据量的通信瓶颈，传感器网络亦可自由加入、变更或退出，方便部署，网络可扩展性好．同时屏蔽底层网络差异及多种接入方式．为用户提供多个访问入口。     

无线传感器网络与IPv6网络的互联方式研究

如何实现无线传感器网络(WSN)与TCP/IP(v6)网络的互联是当前的热点研究方向之一,全IP互联方式是当前讨论最为激烈的焦点问题.在WSN内部是否需要采用IPv6,是WSN协议设计需要回答的一个基本问题,其结论将在很大程度上影响今后WSN协议发展的基本走向.本文首先介绍了WSN与IPv6网络互联的各种方式,然后重点对采用全IP互联方式的必要性以及需要解决的关键技术问题进行了分析探讨,分析结果表明:全IP方式是实现WSN与IPv6网络互联的一种非常重要的思路,值得进行深入研究.     

IPv6无线传感器网络协议测试系统

从IPv6无线传感器网络协议测试的角度,结合IETF,IEEE国际标准,对当前IPv6无线传感器网络协议测试技术进行了分析和研究,阐明了IPv6无线传感器网络协议测试的主要内容,提出了一种IPv6无线传感器网络协议测试系统的设计方案。     

A service-centric model for wireless sensor networks

Most of the current research in wireless sensor networks (WSNs) is constraint driven and focuses on optimizing the use of limited resources (e.g., power) at each sensor. While such constraints are important, there is a energy for more general performance metrics to assess the effectiveness of WSNs. There is also a need for a unified formal model that would enable comparison of different types of WSNs and provide a framework for WSN operations. We propose a new service-centric model that focuses on services provided by a WSN and views a WSN as a service provider. A WSN is modeled at different levels of abstraction. For each level, a set of services and a set of metrics are defined. Services and their interfaces are defined in a formal way to facilitate automatic composition of services, and enable interoperability and multitasking of WSNs at the different levels. A two-way mapping between two neighboring levels is then defined as a decomposition (from higher to lower level) and composition (from lower to higher level). A composite mapping between metrics at different levels connects high-level, mission-oriented metrics and low-level, capability-oriented metrics. The service-centric model consists of mission, network, region, sensor, and capability layers. Each layer has associated semantics that use lower level components as syntactic units (except for the capability layer). Within each layer there are four planes or functionality sets; communication, management, application, and generational learning. The combination of layers and planes enables a service-based visualization paradigm that can provide better understanding of the WSN. The service-centric model provides a holistic approach to measuring and presenting WSNs effectiveness. In addition, it presents a general and flexible framework in which various more specific WSN models can be represented and evaluated.     

IPv4/IPv6协议过渡机制的实验研究

从IPv4向IPv6的过渡是网络发展的一大趋势，但存在很多技术问题亟待解决。为了使这一过渡尽可能地平滑，人们提出了很多解决方法。本文研究了几种主流的过渡机制，并就一个基于隧道代理的过渡方案给出其具体实现方法，并进行了实验。实验证明，该方案有效地实现了对现有IPv4网络向IPv6的升级，并保证了IPv6网络与IPv4网络的互联互通。     

Transition to IPv6 in GPRS and WCDMA mobile networks

The limited size and structure of the Internet address space of IPv4 has caused difficulties in coping with the explosive increase in the number of Internet users. IPv6 is a feasible solution for the problems identified with IPv4. Efficient interworking between IPv4 and IPv6 is very important, because IPv4 networks and services will exist for quite a long time. The transition period will be lengthy, and network/terminal equipment supporting both IP versions will be needed during the transition period. Thus, IPv4 to IPv6 transition issues need special care and attention. The three main transition methods are dual IPv4/IPv6 stacks in network elements/terminals, tunneling, and translators in the network. Three transition phases from IPv4 to IPv6 can be identified. These phases are described. Different transition scenarios from the 2G/3G mobile network point of view are also analyzed. Finally, some conclusions are drawn, and some recommendations on the use of transition methods are given     

在CNGIIPv6上建立诚信安全的P2P环境和分布管理系统

文章指出中国为实施中国下一代互联网(CNGI)计划而大规模布设IPv6骨干网,这为发展P2P应用、建立诚信安全具有分布管理能力的P2P网络环境提供了机会:一方面在CNGI的IPv6网上一开始就可以实行实名制,从而发展建立网络新秩序;另外一方面可以在CNGI上以无缝和持续演进的方式建立智能结点重叠网,以支持P2P应用并提供分布式管理.文章认为CNGI发展的IPv6终端和IPv6用户网(如家庭网、传感器网等)可以通过在现有IPv4有线/无线接入网和城域网中建立IPv6隧道连接到IPv6骨干网P2P平台,以获得足够的通达能力,并在此基础上发展基于P2P的各种新应用.     

未来移动通信的核心技术——IPv6

随着Internet数据业务和移动通信技术的迅速发展,基于Ipv4的Internet已不适应当前应用需求。Ipv6作为一种新型的Internet协议,克服了现有标准Ipv4在地址匮乏、路由表过于庞大和服务安全等方面的不足,Ipv6即将取代Ipv4成为下一代互联网的标准并且为未来移动通信提供重要支持。文中概括介绍了IPv6技术的特点和优势,如何实现IPv4到IPv6的过渡,并且讨论了IPv6对下一代移动通信的影响。     

简述IPv4向IPv6过渡阶段的安全性问题

阐述了IPv4向IPv6过渡的必要性，分析了IPv4与IPv6的主要差异。探讨了IPv4向IPv6过渡阶段的安全性问题以及IPv6安全机制的应用。重点分析了IPv6提供的两种安全机制，以便这两种机制能为IPv4向IPv6过渡阶段的安全性提供更好的支持和保障。     

基于DHT的IPv4/IPv6过渡机制(英文)

IPv4 and IPv6 will coexist for many years during the transition period from the traditional IPv4-based Internet to an IPv6-based Internet.DHTLayer,a novel IPv4/IPv6 transition mechanism based on Distributed Hash Table(DHT) is presented in this paper.It can fully support IPv4 and IPv6 inter-operation.DHTLayer employs a DHT overlay to maintain the routing information between IPv4 and IPv6.It decouples path selection from packet delivery.In DHTLayer,the Looking-Up Route Path is responsible for selecting paths,...     

Deployment and test of IPv6 services in the VTHD network

This article presents the deployment and test of IPv6 services in the very high broadband IP/WDM (VTHD) [L. Thual, 2003] network for new-generation Internet applications. The VTHD project is partially funded by the French government through the French Research Network for Telecom (RNRT). VTHD supports both IPv4 and IPv6 services, and interconnects research centers and institutions in France. It has a public autonomous system number (AS20603) and a public IPv6 subnet. It is connected to the IPv6 global network via open transit (France Telecom's international IP service for ISPs). VTHD in France compares with Internet2 in the United States. This article focuses on the implementation of the IPv6 service, IPv6 performance (in the context of a high-speed network), the advantages of given technologies, and problems encountered. The following items are developed: VTHD architecture, IPv6 address space and aggregation, transition mechanisms, routing protocols, network test performance, IPSec test performance, naming (DNS), and network management.