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。     

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。     

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。     

IPv6技术在无线传感器网络中的应用研究

将IPv6技术运用到无线传感器网络来构建一种新的分层网络结构体系,有利于解决当前无线传感器网络在诸多方面遇到的困境。利用该技术不仅满足无线传感器网络中节点地址的需要,还满足了网络对节点移动性、安全性的需要。文章主要对IPv6无线传感器网络中的安全机制及现有网络融合中的关键技术进行了探讨和研究。     

基于6LoWPAN传感器网关设计

在研究6LoWPAN无线传感器网络以及IPv6网络的基础上,提出一种基于6LoWPAN的传感器网关解决方案,实现6LoWPAN无线传感器网络与IPv6网络之间互联,并对网关中的硬件与软件设计进行论述。最后搭建测试网络,通过对端到端网络的连接性、延时变化、往返延时、丢包率以及吞吐量的测试,对该网络性能作出简要分析。测试结果表明,该网关实现了6LoWPAN无线传感器网络与IPv6网络的互联,并能在实际网络环境中运行。     

6lo WPAN适配层在IPV6网络应用中的性能分析与研究

随着网络技术、通信、计算机等技术的迅速发展,IPv6overIEEE802．15．4（即6LoWPAN）,已经在物联网、传感器网络中发挥越来越重要的作用,重点解决了传感器网络和IPv6互联网之间的连接控制和监测问题。根据6LoWPAN工作组的标准,在网络层和数据链路层之间加入了一个适配层,提供分片与重组、报头压缩与解压缩等功能,使得IPv6数据包能够在IEEE802．15．4网络中传输,从而实现无线传感器网络与IPv6网络之间的无缝连接。本文介绍了IEEE802．15．4标准和6LoWPAN~技术,讨论了6LoWPAN的优势,分析了其关键技术,对6LoWPAN的应用进行了探讨。     

基于6LoWPAN和CoAP的农业环境信息传感系统的设计与实现

针对农业生产环境中信息监测点分散和学校现有无线传感网络(WSN)的不足,采用移植性强支持6LoWPAN协议栈的Contiki嵌入式操作系统在STM32平台上进行农业环境信息监测传感器节点设计;在DDWrt上实现了支持6LoWPAN协议栈的IPv4/IPv6双栈边缘路由器,将监测到的农业环境信息转发到IPv4/IPv6网络,最终实现了基于6LoWPAN的农业信息传感系统。在校园网环境下测试了农业环境信息传感节点与测试机网络的连通性,测试结果表明,基于6LoWPAN协议的无线网关与农业环境信息监测传感节点通过6LoWPAN协议可以正常通信,用户可通过CoAP协议访问6LoWPAN无线传感器网络。     

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。     

ZigBee无线传感器网络在煤矿安全监测中的应用

本文在研究分析ZigBee无线传感器网络技术特点的基础之上,提出了一种基于ZigBee的煤矿安全监测系统应用方案。详细设计了该系统的网络体系结构、ZigBee无线传感器网络路南算法和煤矿安全监测系统中数据采集和传输过程,实现了ZigBee无线传感器网络低能耗、高通信效率、良好稳定性等特性与煤矿井下复杂的环境下通信要求的完美结合。     

基于IPv6的WSN边界路由器设计

针对无线传感器网络与IPv6网络互联,在分析现有接入方式不足的基础上设计了一种基于IPv6的无线传感器网络边界路由器。主要阐述了边界路由器的硬件和软件实现,重点介绍了基于IPv6的无线传感器网络协议栈适配层的设计。通过数据包分片与重组机制以及报头压缩机制,协议栈适配层实现了IPv6数据包在IEEE 802.15.4链路中的传输。实验结果表明,该设计方案实现了无线传感器网络与IPv6网络的无缝融合,数据传输稳定可靠,具有应用价值。     

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.     

Wireless Sensor Networks in IPv4/IPv6 Transition Scenarios

The wireless sensor networks (WSNs) concept was appeared in the middle of 90s and have been a subject under intensive research in the past few years. Several factors have contributed to this, but the potential for application of WSNs in almost every aspect of day-to-day life is the predominant one. This type of networks has been developed using proprietary solutions instead of standard solutions. More recently, the importance of standards motivated the use of IETF standards in WSNs, making the Internet integration easier. However, more efforts are necessary in order to provide a full integration. The WSNs use mainly IPv6 protocol, but the IPv4 is the predominant one in the Internet. As a consequence, IPv4 to IPv6 transition mechanisms must be provided to allow the interaction between all Internet connected devices independently of the supported IP version. It is also critical to provide a standard application interface to make easier the application development and independently of the hardware platform used. The RESTfull Web services can provide this standard interface. So, combine RESTfull Web services with IPv4 to IPv6 transition mechanisms can increase the WSN services dissemination. The transition mechanisms and the REST Web services are supported in the gateway in order to save the wireless sensor device resources’. The smartphone with Internet connectivity can also be the drive to the WSNs growth, because user-friendly applications can be used to retrieve and collect sensed data. This paper proposes a solution based on REST web services to permit the interaction between a mobile application and the IPv6 compliant WSN.     

基于NAT-PT转换网关的DNS-ALG研究与实现

NAT-PT只能提供从IPv6到IPv4的单向连接,要实现从IPv4外网到IPv6网络的访问,这就必须结合DNS-ALG进行域名支持.提出了一种IPv4/IPv6转换网关的设计方案,在NAT-PT的基础上封装了一个应用层网关DNS-ALG.在应用层上实现了域名访问的透明性,从而屏蔽了网际协议不同对上层的影响,实现了IPv4与IPv6的双向连接.DNS-ALG是实现IPv4与IPv6网络双向访问的关键技术.     

A Low Latency Handoff Algorithm for Voice over IP Traffics in the Next Generation Packet-Based Cellular Networks: Cellular Mobile IPv6

In the mobile communication environments, Mobile IP is defined to provide users roaming everywhere and transmit information freely. It integrates communication and network systems into Internet. The Mobile IPv6 concepts are similar to Mobile IP, and some new functions of IPv6 bring new features and schemes for mobility support. Two major problems in mobile environments are packet loss and handoff. To solve those problems, a mobile management scheme – the cellular mobile IPv6 (CMIv6) is proposed. Our approach isbased on the Internet Protocol version 6 and is compatible with the Mobile IPv6 standard. Besides, it also combines with the cellular technologies which is an inevitable architecture for the future Personal Communication Service system (PCS). In this paper, {Cellular Mobile IPv6 (CMIv6)}, a new solutionmigrated from Mobile IPv6, is proposed for mobile nodes moving among small wireless cells at high speed. This is important for future mobile communication trends. CMIv6 can solve the problems of communication break off within smaller cellular coverage during high-speed movement when packet-switched data or the real-time voice messages are transmitted. Voice over IP (VoIP) packets were chosen to verify this system. The G.723.1 Codec scheme was selected because it has better jitter resistance than GSM and G729 in a packet-based cellular network. Simulation results using OPNET show smooth and non-breaking handoffs during high-speed movement.     

对IPv6网络安全接入问题的研究

本文提出了一种新的IPv6网络安全接入方案.文中首先介绍了IPv6网络安全接入所要解决的问题以及现有解决方案,然后在详细分析IPv6地址自动配置过程的基础上,提出了一种新的基于认证的IPv6地址自动配置方案,以解决IPv6网络安全接入问题,并对其中涉及到的关键问题进行了详细讨论,提出了一些切实可行的方法.接着,论述了本方案的突出优点,证实了本方案是能够从源头上解决IPv6网络安全接入问题的轻量级方案,非常适合应用于未来的无线网络中.最后,对本方案的应用前景进行了展望.     

An IPv6 address configuration scheme for wireless sensor networks based on location information

The paper proposes an IPv6 address configuration scheme for wireless sensor networks based on sensor nodes’ location information. The scheme divides WSN into multiple clusters based on sensor nodes’ location information and proposes the IPv6 address structure for sensor nodes based on their location information. In the scheme, a cluster head combines the stateless configuration strategy and the stateful configuration strategy to assign the IPv6 addresses for the cluster members in the same cluster. In the stateless configuration strategy, a cluster head employs the hash division method to configure the IPv6 addresses for the cluster members and utilizes the linear probing method to solve the address collision, and the DAD for the IPv6 addresses assigned for the cluster members is only performed within the cluster where the cluster members locate. In addition, the IPv6 address configuration for the cluster members in the different clusters can be performed simultaneously, so the IPv6 address configuration delay time is shortened and the IPv6 address configuration cost is reduced. The paper analyzes the performance parameters of the proposed scheme, Strong DAD and MANETConf, including DAD cost, address configuration cost and address configuration delay time, and the analytical results show that the performance of the proposed scheme is better than Strong DAD and MANETConf.     

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.     

6LoWPAN中优化多路径路由吞吐率的数据包分片方案

6LoWPAN协议支持在IEEE 802.15.4低功耗无线个域网络中传递IPv6数据包,其主要功能包括对IPv6数据包进行分片与拼装、头部压缩和路由。该文利用概率论推导了6LoWPAN中一个IPv6数据包从信源到达信宿所需要的发送次数、传递时延和吞吐率,建立了基于多路径路由优化吞吐率的数学模型,并依此提出了IPv6数据包的最优分片方案,该方案可以提高6LoWPAN中IPv6数据包的吞吐率。