基于簇的MANET地址配置方案

提出了一种MANET的动态IPv6地址配置方案。此方案采用层次分配体系结构,即中心节点为簇首节点分配地址,簇首节点为簇内节点分配地址。提出了以簇内节点数量为度量单位的簇构建算法,实现了簇首节点最小化,降低了簇首节点地址分配代价。中心节点/簇首节点采用单播通信方式实现了地址实时回收,保证了中心节点/簇首节点有足够的地址进行分配。最后提出了低代价的MANET合并和分裂算法,有效减少了MA-NET合并次数。对所提方案的地址配置代价、地址配置延迟以及MANET合并次数等性能参数进行了分析,分析结果表明本方案有效降低了地址配置代价,缩短了地址配置延迟,减少了MANET合并次数。     

对移动自组网体系结构的再思考

移动自组网(MANET)是一组由路由和转发功能的移动节点组成的一个多跳、无中心的临时性自治系统.分析了MA-NET节点结构特点和常用的两种拓扑结构,即平面结构和分级结构.给出了网络体系结构定义,包括描述协议和通信机制的设计准则和实现网络体系结构的方法.报告了Internet体系结构发展过程现状,提出了MANET协议栈一般模型结构及基于MANET的管理平台,总结了对MANET体系结构发展建议,得到了网络体系结构中网络分层是典型的"结构决定功能"的系统科学的基本观点和网络体系结构与需求,技术相关的结论.     

基于分簇结构的无线移动网络多播路由协议

移动自组网（MANET,Mobile Ad hoc Networks）是一种特殊的、应用前景广阔的新型移动无线网络。特有的网络特性使它在诸如灾难救助、战场、传感器网络、分布式计算等领域有着广泛的应用前景。结合在移动自组网络中应用最为广泛的分层结构——簇结构的特点,提出了一种基于簇结构的移动自组网多播波路由协议。协议通过对移动自组网进行簇划分,形成由簇头、簇间节点和簇内节点构成的分簇网络结构,并且在由簇头和簇间节点形成的虚拟骨干网基础上,对其进行回路检测和冗余剪枝算法处理,最终得到一个能满足多播要求的多播树,从而实现在移动自组网中的多播路由。通过对仿真实验结果的分析,该协议具有稳定的数据包发送率和较低的路由建立时间。     

基于IPv6的移动自组网移动切换方案*

提出了一种基于IPv6的移动自组网移动切换方案IMHM.在没有基础设施的MANET中,IMHM实现了移动节点家乡地址的永久性,即用户采用移动节点的家乡地址与移动节点保持通信,无须参与移动切换过程,移动节点的移动过程及转交地址变更过程对用户透明.对AODV和IMHM的移动切换代价和移动切换延迟等性能参数进行了分析比较,分析结果表明IMHM的移动切换代价更小、移动切换延迟更短.     

移动自组网中一种基于分簇的信任评估方案

移动自组网中信任评估方案主要用来防止网络中不良行为节点的安全威胁,本文提出一种基于分簇的信任评估方案。节点通过参考簇首发放的信任值证书可以对陌生节点进行准确有效的信任评估,并给出了该方案所涉及的信任评估公式以及簇的形成与管理的部分具体措施。它克服了移动自组网内传统信任评估方案中陌生节点间受限的信息交流的问题,减少了所需的存储空间,最后针对移动自组网部分安全问题给出了方案分析。     

移动自组网中基于按需加权的NTDR分簇算法

本文分析了移动自组网几种典型分簇算法,并针对现有分簇算法的不足,提出基于按需加权的NTDR（DWNTDR）分簇算法,该算法综合考虑影响移动自组网性能的节点度,速度等多种因素。通过模拟和比较各分簇算法,证明该算法更适合移动自组网入侵检测系统。     

移动自组网络分簇算法综述

在移动自组网络中,许多应用都依赖层次结构的支持。簇结构是移动自组网络中应用最为广泛的层次结构。本文介绍了实现簇结构的多种典型分族算法,以及度量分簇算法的标准与工具,比较了各种算法的优缺点,最后对未来分簇算法的研究热点进行了预测。     

分层移动IP网络的自适应移动性管理

移动IP(mobile IP,MIP)使主机在移动过程中不需改变IP地址便可连续访问Internet,其主要缺点是主机在移动过程中需要频繁地进行绑定更新,产生的信令开销较大。为降低移动IPv6的信令开销,IETF(Internet engineering task force)提出了分层移动IPv6(hierarchical mobile IPv6,HMIPv6)协议。基于HMIPv6,提出了一种自适应的分层移动性管理方案。这种方案采用模糊逻辑,根据移动主机的移动次数及移动性管理代价,动态选取MAP(mobility anchor point)并调整MAP区域所管辖的接入路由器个数。仿真分析表明,所提出的方案的代价优于固定MAP区域的移动性管理方案。     

基于中国余数定理的移动自组网签名方案

作为一种新型的无线移动网络,移动自组网（mobile ad hoc network,MANET）的安全是现在主要的研究方向。MANET网络不同于传统的网络,因此需要一些新的安全机制。文章简要介绍了MANET网络体系结构特点所面临的问题和需要达到的安全目标,提出了一种基于中国余数定理的分布式门限签名方案,该方案与MANET的特性非常一致。文章还给出了一个采用RSA公钥系统的数字签名算法。分析表明,这种方案具有较好的计算性能。     

面向野战环境的簇型MANET网络身份认证及密钥管理技术研究

MANET网络正得到越来越广泛的应用,其安全性正成为目前研究的一个热点。本文对簇型结构的移动自组网进行了安全性研究,分析并指出了现有一些方案中还存在的安全漏洞,并在此基础上提出了一种增强安全型簇结构。与现有方案相比,明确了初始簇首的产生以及簇首轮换实施方案,增强了簇首保护机制,研究并提出了基于簇型结构的完备的门限密钥管理机制和分布式认证机制。     

Research on IPv6 address configuration for a VANET

The paper proposes an IPv6 address configuration scheme for a VANET (Vehicular Ad hoc Network). In the paper, the VANET architecture is presented, and based on the architecture the hierarchical IPv6 address structure is created. Based on the hierarchical address structure, the distributed IPv6 address configuration scheme is proposed. In the scheme, each AP (Access Point) has the unique address space and has the right to assign an IPv6 address for an OBU (Onboard Unit). In this way, the address configuration task is distributed around all APs in a VANET, so the distribution of the address configuration is achieved. Moreover, an OBU acquires a unique IPv6 address from a neighbor AP without DAD (Duplicate Address Detection), so the transmission of the control packets used for the address configuration is controlled within one-hop scope. The paper also proposes the address recovery algorithm. Through the algorithm, an AP can retrieve the IPv6 address resources released by OBUs timely and effectively, so it has always sufficient address space for assignment. The paper evaluates the performance of the proposed scheme. The data results show that the proposed scheme reduces the address configuration cost, shortens the address configuration delay and improves the address configuration success rate.     

一种6LoWPAN无线传感器网络移动协议

提出了一种6LoWPAN无线传感器网络移动协议。此协议提出了6LoWPAN网络体系结构,以及6LoWPAN网络地址分层结构及地址配置算法。基于提出的6LoWPAN网络体系结构,提出了6LoWPAN网络内与网络之间的移动切换协议。在移动过程中,移动节点无须转交地址,即移动切换过程无须为移动节点配置转交地址,也无须进行转交地址注册,因此降低了移动切换代价和延迟。从理论和仿真两个角度对MIPv6、Inter-MARIO及本协议的移动切换代价、移动切换延迟、丢包率等性能参数进行了分析比较,分析结果表明本协议的移动切换代价更小、移动切换延迟更短、丢包率更低。     

基于簇树的6LoWPAN无线传感器网络构建方案*

提出了基于簇树的6LoWPAN无线传感器网络构建方案,此方案提出以簇内节点数量为度量参数的簇生成算法,在簇生成算法中,总是簇内节点总数最多的簇首节点首先发起簇的生成过程,因此实现了簇首节点数量最小化。此外,本方案还提出了簇首节点及簇关联节点移动或失效时的簇及簇树的修复算法,即基于簇内节点的权值选举新的簇首节点或簇关联节点,以维护簇或簇树的拓扑结构,确保IPv6地址配置和路由的连续性及正确性。对本方案进行了性能分析,分析结果验证了其构建的网络结构稳定性更强,路由功耗更低。     

A survey of data replication techniques for mobile ad hoc network databases

A mobile ad hoc network (MANET) is a network that allows mobile servers and clients to communicate in the absence of a fixed infrastructure. MANET is a fast growing area of research as it finds use in a variety of applications. In order to facilitate efficient data access and update, databases are deployed on MANETs. These databases that operate on MANETs are referred to as MANET databases. Since data availability in MANETs is affected by the mobility and power constraints of the servers and clients, data in MANETs are replicated. A number of data replication techniques have been proposed for MANET databases. This paper identifies issues involved in MANET data replication and attempts to classify existing MANET data replication techniques based on the issues they address. The attributes of the replication techniques are also tabulated to facilitate a feature comparison of the existing MANET data replication works. Parameters and performance metrics are also presented to measure the performance of MANET replication techniques. In addition, this paper also proposes criteria for selecting appropriate data replication techniques for various application requirements. Finally, the paper concludes with a discussion on future research directions.     

Mobility management solution for IPv6-based vehicular networks

This paper proposes a mobility management solution for IPv6-based vehicular networks. First, the architecture based on vehicle domains is proposed in order to reduce the mobility handover frequency and delay. Based on the architecture, a distributed address configuration algorithm is proposed. Based on the address configuration algorithm, a vehicle can establish a routing path reaching the nearest AP (Access point) and achieve the multi-hop communication with the Internet through the routing path. Finally, based on the routing algorithm, the mobility management solution is proposed. The data results show that the solution shortens the mobility handover delay and lowers the packet loss.     

All-IP communication between wireless sensor networks and IPv6 networks based on location information

The paper proposes a scheme on achieving all-IP communication between wireless sensor networks and IPv6 networks based on sensor nodes' location information. The paper proposes the sensor node's IPv6 address structure based on location information, the IPv6-address configuration algorithm based on the proposed IPv6 address structure, the mobility handoff algorithm and the routing algorithm in the link layer. The location information of sensor nodes is utilized to achieve the IPv6-address configuration algorithm and the routing algorithm. In the mobility handoff algorithm, neither does a mobile sensor node need a care-of address during the mobility process, nor is involved in the mobility handoff process. Therefore, a mobile sensor node's power consumption is reduced and the life span is prolonged. The paper analyzes the performances of the proposed scheme and the existing schemes, and the analytical data show that the performance of the proposed scheme is better.     

一种多频分级Ad Hoc网络的组网方案

采用多频分级结构的大型移动Ad hoc网络,需要高效的组网机制来实现控制开销少、可扩展性强的有机组织和维护,为此提出了一种分级结构的组网方案,设计并集成了分群、IPv6地址配置、路由及移动管理操作。仿真结果表明该方案能有效提高组网的效率和性能,同时对节点的群移动方式提供了良好的支持。     

Intra domain route optimization for ubiquitous network

The main advantage of a wireless network is user mobility, which calls for efficient routing support at the network layer. An architecture combines hierarchical mobile IPv6 and network mobility for a network mobile and mobile nodes move in tandem and make a hierarchy in the wireless network to management of micro-mobility and seamless handoff. But the capability of the architecture for intra domain route optimization is impaired. So we propose functionality in domain nodes to enable intra domain path optimization for ubiquitous network. It is shown that intra domain cost effect is beneficial in every hierarchical domain that spans mesh network topology. We address the key function for our proposed scheme and analyze the usefulness of our proposed method using mathematically. We show that our proposed scheme performs much better than Network Mobility protocol, especially when the number of mobile nodes or mobile routers or correspondent nodes increases in hierarchically nested in ubiquitous networks.