一个高效的移动自组网广播协议

广播操作是无线移动自组网络中常用的操作,通常采用洪泛业实现。无控制的洪泛会带来大量重复消息,大大降低网络的吞吐率,称为广播风暴问题。鉴此,本文提出了一个高效的广播协议。通过在广播时有选择地转发消息,该协议能大大减少洪泛中的广播开销。模拟试验证明,本文提出的协议性能优于洪泛,可伸缩性强,实现简单,能有效地
地用于移动自组网中。     

基于能量有效的移动Ad Hoc网络路由算法

由于移动Ad hoc网络中节点通常采用电池供电,一旦电源耗尽,节点就会被迫退出网络,因此降低节点的能量消耗对保证节点间链路稳定至关重要。给出了节点剩余能量的计算公式,基于节点剩余能量提出了一种能量有效的移动Ad Hoc网络路由算法MTMR,该算法能够延长网络的生命周期,并给出了该路由算法的寻径示例。     

基于能量有效的移动Ad Hoc网络路由算法

由于移动Adhoc网络中节点通常采用电池供电,一旦电源耗尽,节点就会被迫退出网络,因此降低节点的能量消耗对保证节点间链路稳定至关重要。给出了节点剩余能量的计算公式,基于节点剩余能量提出了一种能量有效的移动AdHoc网络路由算法MTMR,该算法能够延长网络的生命周期,并给出了该路由算法的寻径示例。     

An Immunity-based Security Architecture for Mobile Ad Hoc Networks

Mobile ad hoc network of lets convenient infrastructure less communication over the shared wireless channel. However, the nature of ad hoc networks makes them vulnerable to security attacks. Existing security technologies such as intrusion prevention and intrusion detection are passive in response to intrusions in that their countermeasures are only to protect the networks and there is no automated, network-wide counteraction against detected intrusions. While they all play an important role in counteracting intrusion, they do not, however, effectively address the root cause of the problem - intruders. In this paper, wc propose the architecture of automated intrusion response. When an intruder is found in our architecture, the block agents will get to the neighbor nodes of the intruder and formed a firewall to isolate the intruder. In the end, we illustrate our architecture by an example.     

移动自组织网络中一种有效的广播技术

基于最小连通支配集（MCDS）的广播路由方法是一个很好的路由方法,它将路由过程简化到MCDS生成的较小的子网中。然而这一方法没有考虑网络中的节点的多样性和复杂性。针对实际情况中移动自组织网络中节点的复杂性问题,该文提出了一种基于极大权的最小连通支配集（MWMCDS）的有效广播途径。仿真结果表明,它能确保性能强的节点担任网关节点的角色,能更好地协调管理网络中其他的节点,从而保持MCDS的相对稳固性并为全网中的广播路由操作提供一个高效的通信基础。该算法能在保证生成权和极大的连通支配集的同时也确保它的极小性,因此是一种有效的广播路由算法。     

An Energy-Aware Geographic Routing Protocol for Mobile Ad Hoc Networks

Mobile ad hoc networks (MANET) are characterized by multi-hop wireless links and resource constrained nodes. To improve network lifetime, energy balance is an important concern in such networks. Geographic routing has been widely regarded as efficient and scalable. However, it cannot guarantee packet delivery in some cases, such as faulty location services. Moreover, greedy forwarding always takes the shortest local path so that it has a tendency of depleting the energy of nodes on the shortest path. The matter gets even worse when the nodes on the boundaries of routing holes suffer from excessive energy consumption, since geographic routing tends to deliver data packets along the boundaries by perimeter routing. In this paper, we present an Energy-Aware Geographic Routing (EGR) protocol for MANET that combines local position information and residual energy levels to make routing decisions. In addition, we use the prediction of the range of a destination''s movement to improve the delivery ratio. The simulation shows that EGR exhibits a noticeably longer network lifetime and a higher delivery rate than some non-energy-aware geographic routing algorithms, such as GPSR, while not compromising too much on end-to-end delivery delay.     

一种改进的WCA算法

在WCA的基础上,提出了EWCA（Enhanced Weighted Clustering Algorithm）算法,在提高性能的同时降低了开销,并保持了算法的通用性,移动自组网中通过模拟实验对该分簇算法与WCA算法进行了性能比较。     

分布式PKI在移动Ad Hoc网中的应用

介绍了一种基于椭圆曲线和门限算法的数字签名算法，并提出了一个基于分布式PKI的移动Ad Hoc网络安全体系结构。该体系结构中主要采用了分布式PKI安全机制、门限密钥管理、椭圆曲线算法和动态网络分簇思想。分布式PKI和门限密钥管理的应用增加了系统的安全性、容错性，椭圆曲线算法的应用减少了对移动节点的性能的要求，分簇算法的应用减少了对节点容量的要求。     

分布式PKI在移动Ad Hoc网中的应用

介绍了一种基于椭圆曲线和门限算法的数字签名算法,并提出了一个基于分布式PKI的移动Ad Hoc网络安全体系结构。该体系结构中主要采用了分布式PKI安全机制、门限密钥管理、椭圆曲线算法和动态网络分簇思想。分布式PKI和门限密钥管理的应用增加了系统的安全性、容错性,椭圆曲线算法的应用减少了对移动节点的性能的要求,分簇算法的应用减少了对节点容量的要求。     

一种改进的移动ad-hoc网络安全模型

该文分析了文献[1]提出的基于信任分散的ad-hoc网络安全模型的不足之处,给出了该安全模型并不完善的原因并针对DOS攻击提出了一种改进的移动ad-hoc网络安全模型。     

Security in Mobile Ad Hoc Networks

One of the most critical roles security researchers have is keeping up with new technologies and considering the security implications that go along with them-essentially, ensuring that security is "baked in" to new ideas from the earliest possible moment. Because of this, researchers have had significant interest in the field of mobile ad hoc networks (Manets). Such networks are frequently viewed as a key communications technology enabler for network-centric warfare and disaster relief operations, and as the technology matures, Manets are increasingly reaching many other applications in areas such as intelligent transportation systems and fault-tolerant mobile sensor grids.     

移动Ad Hoc网络路由修复算法研究

针对移动Ad Hoc网络路由算法本地修复方面,研究移动Ad Hoe网络由于节点相对运动或无线环境变化所引起的链路失效的修复问题.分析传统的本地修复方式采用全网泛洪所产生的大量控制开销对业务传输时延及分组成功交付率等方面产生的影响.采用基于on-the-fly策略的移动Ad Hoc网络路由修复算法研究,构造了将修复请求区域限制在两跳范围内的修复模型,并建立相应的修复函数,从而实现在满足修复概率的前提下降低网络泛洪与控制开销的目标.     

一种移动Ad Hoc网络综合选路基准

移动Ad hoc网络路由质量受到很多因素的影响.目前,多数移动Ad hoc网络路由协议利用单一跳数或其他基准作为路由产生的判据,使得协议整体性能的改善比较困难.提出一种考虑节点能量、通信干扰、丢失率和移动性(energy, interference, communication drop rate and mobility,简称EIDM)的综合选路基准.使用自适应权重,该基准能够根据网络状态调节各因子的作用.模拟实验结果显示,EIDM很好地减缓了热点效应.     

基于规范的移动Ad Hoc网络分布式入侵检测

移动ad hoc网络是移动节点自组织形成的网络,由于其动态拓扑、无线传输的特点,容易遭受各种网络攻击。传统的网络安全措施,如防火墙、加密、认证等技术,在移动ad hoc网络中难以应用,因此提出一种基于有限状态机分布式合作的入侵检测算法。首先,将整个网络分为子区域,每一区域随机选出簇头担任监视节点,负责本区域的入侵检测。其次,按照DSR路由协议构筑节点正常行为和入侵行为的有限状态机,监视节点收集其邻居节点的行为信息,利用有限状态机分析节点的行为,发现入侵者。本算法不需要事先进行数据训练并能够实时检测入侵行为。最后,通过模拟实验证实了算法的有效性。     

基于无线自组织网络的TCP Freeze-Probing改进协议

传统的TCP协议在有线网络中能够良好地工作,但用于无线自组织网络时则性能有所下降.其原因在于,传统的TCP协议无法分辨网络丢包原因,如网络拥塞、链路断开、信道错误或者链路改变.为了提高TCP协议在无线自组织网络中的性能,提出了一种TCP协议的改进方案TCP Freeze-Probing.该方案是一种端到端方法,不需要网络中间节点的反馈合作同时,提出了一种基于TCP Freeze-Probing的吞吐量模型并利用仿真对模型进行了验证.分析和仿真结果表明,该方案能够有效地改进TCP在无线自组织网络的性能.     

一种新的Ad Hoc网络中节约能量的广播路由协议

移动AdHoc网络中移动节点通过电池来供应能量,如果部分电池的能量被耗尽,整个网络将变成多个分离的网络,网络的生命周期减小。在路由协议的设计中如何有效地使用能量、延长网络的生命周期有重要的意义。论文对已知的节约能量的广播路由算法进行了讨论,并从平衡节点的能量消耗的角度出发,提出了一种新的节约能量的路由算法AMLE。AMLE通过Prim算法构造一个具有MLE(MinimumLongestEdge)性质的广播树,并通过区域预测机制来维护广播树,在不增加节点总的能量消耗的前提下平衡各节点的能量消耗。     

一种移动Ad Hoc网络中身份认证与地址分配方案

现有ad hoc网络协议都是假设节点进入网络时已经分配了IP地址,而且在节点进入网络时假设节点之间无条件信任,这种缺乏对安全性的考虑是无法在实际战场环境下使用的。该文提出一种新的安全的解决方案,它由建立路由前的节点间的相互身份认证和安全地址分配(公钥散列产生节点地址)两个部分组成。方案可以有效地防止各种相关的攻击,最后还进行了方案的效率分析。     

DRP: An Efficient Directional Routing Protocol for Mobile Ad Hoc Networks

Many modern networked applications require specific levels of service quality from the underlying network. Moreover, next-generation networked applications are expected to adapt to changes in the underlying network, services, and user interactions. While some applications have built-in adaptivity, the adaptation itself requires specification of a system model. This paper presents Sapphire, an experimental approach for systematic model generation for application adaptation within a target network. It employs a nearly-automated, statistical design of experiments to characterize the relationships of both application and network-level parameters. First, it applies the analysis of variance (ANOVA) method to identify the most significant parameters and their interactions that affect performance. Next, it generates a model of application performance with respect to these parameters within the ranges of measurements. The key benefit of the framework is the integration of several well-established concepts of statistical modeling and distributed systems in the form of simple APIs so that existing applications can take advantage of it. We demonstrate the usefulness and flexibility of Sapphire by generating a performance model of an audio streaming application. We show that many existing multimedia and QoS-sensitive applications can exploit a statistical modeling approach such as Sapphire to incorporate application adaptivity. The approach can also be used for feedback control of distributed applications, tuning network and application parameters to achieve service levels in a target network     

移动Ad Hoc网络中的资源发现

介绍了一种新的移动Ad Hoc网络中使用的基本资源发现技术和一种新的架构来提供统一的资源发现和资源提供者的QoS-aware选择的解决方法.架构的关键在于一系列的自组织发现代理.这些代理使用哈希索引来管理资源的目录信息.将网络动态划分成数个域,并且选择内部和外部QoS信息来选择适当的提供者.模拟试验表明,该架构改善了QoS到客户端的传输,使开销和相应时间保持在一个低水平上.