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移动自组织网络服务质量控制机制综述 总被引:1,自引:0,他引:1
综述了移动Ad Hoc网络的QoS机制,将其划分为链路层、网络层、传输层、跨层优化和网络间QoS机制,并加以比较和分析。链路层QoS机制主要在于提供QoS控制的MAC协议。学者在网络层设计了各种服务质量感知路由,包括原有路由协议的QoS控制扩展和全新的支持QoS控制的路由协议。为了区分传输失败的原因以及降低资源竞争,传输层提供适合移动Ad Hoc网络的TCP协议。为了全面解决链路层触发、路由选择和负载平衡的问题,学者提出跨层构建QoS体系结构。网络间QoS机制主要在于提供移动Ad Hoc网络和固定结构网络之间的QoS保证。最后进行对比总结,指出了各种技术的特点和适用范围,并展望了该领域的未来发展方向。 相似文献
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讨论分布环境中的算法问题,即网络上的计算机不执行给定的算法,而是执行最利于其主人工作的情况。作为这样的参与者即操纵算法的代理,算法设计者应事先确保代理的利益通过真实报告是最大的。引用了机制设计的概念,主要讨论了一个具有代表性的问题一任务调度问题。该问题不能通过标准的机制设计的方法去实现,因此,文中提出了几种特别方法,包括近似机制、随机机制以及验证机制。 相似文献
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在无线网络路由协议中,错误地使用路由尺度会降低网络的路由性能,甚至会导致某些节点之间根本无法正常通信,称为路由尺度的兼容性问题.基于路由代数理论,分析了贪婪协议中路由尺度的兼容性问题,推导出了贪婪算法用作数据分组的转发机制时贪婪协议具有可达性的充分必要条件,并以4个路由尺度实例说明了分析结论在贪婪协议设计中的具体应用,为贪婪协议的设计提供了重要的技术依据. 相似文献
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章永兴 《计算机研究与发展》1999,36(9):1047-1050
微流水技术是异步电路中实现流水线设计的有效方法,而路由芯片是高速通信网络中的重要硬件部件。文中首先介绍了微流水设计的基本结构和控制,然后介绍了采用 洞机制的路由芯片的工作机理,并给出了利用微流水实现ASIC路由芯片的具体应用,该芯片达到了简单、高效、可靠的设计目标,文中的最后还给出了在线较复杂的电路系统中实现微流水所需要进一步研究的问题。 相似文献
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樊晓香 《计算机技术与发展》2008,18(7)
讨论分布环境中的算法问题,即网络上的计算机不执行给定的算法,而是执行最利于其主人工作的情况.作为这样的参与者即操纵算法的代理,算法设计者应事先确保代理的利益通过真实报告是最大的.引用了机制设计的概念,主要讨论了一个具有代表性的问题--任务调度问题.该问题不能通过标准的机制设计的方法去实现,因此,文中提出了几种特别方法,包括近似机制、随机机制以及验证机制. 相似文献
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Wireless sensor networks are inherently plagued by problems of node failure, interference to communications from environmental noise and energy-limited sensor motes. These problems pose conflicting issues in the design of suitable routing protocols. Several existing reliable routing protocols exploit message broadcast redundancy and hop count as routing metrics and their performance trade-offs are revealed during simulation. In this paper, we study and analyse related design issues in proposed efficient and reliable routing protocols that attempt to achieve reliable and efficient communication performance in both single- and multi-hub sensor networks. Simulation results of four such routing protocols show that routing performance depends more on optimal (near-optimal) routing in single hub than in multi-hub networks. Our work also shows that optimal (near-optimal) routing is better achieved when historical metrics like packet distance traversed and transmission success are also considered in the routing protocol design. 相似文献
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Delay Tolerant Networks (DTNs) often suffer from intermittent disruption due to factors such as mobility and energy. Though lots of routing algorithms in DTNs have been proposed in the last few years, the routing security problems have not attracted enough attention. DTNs are still facing the threats from different kinds of routing attacks. In this paper, a general purpose defense mechanism is proposed against various routing attacks on DTNs. The defense mechanism is based on the routing path information acquired from the forwarded messages and the acknowledgment (ACK), and it is suitable for different routing schemes. Evolutionary game theory is applied with the defense mechanism to analyze and facilitate the strategy changes of the nodes in the networks. Simulation results show that the proposed evolutionary game theory based defense scheme can achieve high average delivery ratio, low network overhead and low average transmission delay in various routing attack scenarios. By introducing the game theory, the networks can avoid being attacked and provide normal transmission service. The networks can reach evolutionary strategy stable (ESS) under special conditions after evolution. The initial parameters will affect the convergence speed and the final ESS, but the initial ratio of the nodes choosing different strategies can only affect the game process. 相似文献
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Irfan Zakiuddin Tim Hawkins Nick Moffat 《Electronic Notes in Theoretical Computer Science》2005,119(1):67
In this paper we present a new application of game theory, in which game theoretic techniques are used to provide a rigorous underpinning to the analysis of ad-hoc routing protocols. The explosion of interest in ad-hoc networks over the last few years has resulted in a very large number of routing protocols being proposed. Despite this, the science of analysing routing protocols is still relatively immature, and the question that remains is how to decide “how good” a given protocol is. We propose a game theoretic approach as a potentially effective means of answering this question. The conceptual mapping of routing into a game is, we believe, natural and simple. Furthermore, game theory provides an extensive repertoire of tools to analyse key properties. The paper describes how routing techniques can be modelled as games and presents some analytical results. 相似文献
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无线传感器网络(WSNs)是计算机、通信和传感器3项技术相结合的产物,因其巨大的应用前景受到了越来越广泛的关注。介绍了WSNs的一些特点,指出传统路由协议不能有效应用于WSNs的路由协议;然后分类阐述了当前较为典型的路由协议,分析了它们的优缺点;对比分析了这些协议的特点;总结了路由协议设计应满足的要求、存在的挑战以及可能的研究方向。 相似文献
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若干无线传感器网络路由协议比较研究 总被引:28,自引:3,他引:28
无线传感器网络作为计算、通信和传感器3项技术相结合的产物,目前成为计算机科学领域一个活跃的研究分支。结合近年来国外的研究成果,着重从路由协议方面介绍无线传感器网络的研究现状,比较分析了LEACH和SPIN等多种路由协议,指出了各自的特色。 相似文献
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多跳无线移动Ad Hoc网络路由协议的研究分析 总被引:6,自引:2,他引:6
无线移动Ad Hoe网络(MANET)作为可移动分布式多跳无线网络,没有预先确定的网络拓扑或网络基础设施以及集中控制.为了在如此的网络中促进通信,路由协议主要用于在节点之间发现路径.Ad Hoe网络路由协议的主要目的是网络拓扑的动态变化、任意两个节点之间建立一个使得通信总费用和带宽消费最少的正确和有效的通信路径.描述了设计移动Ad Hoe网络路由协议所面临的问题以及对它们的评价,详细比较了七种典型无线移动AdHoe网络路由协议的特性和功能,即DSDV,CGSR,WRP,AODV,DSR,TORA和ABR,为进一步的研究提出了新的课题. 相似文献
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在简要介绍Ad hoc网络路由算法设计要求的基础上,从先验式路由协议和反应式路由协议两种协议的分类角度,分析几种单路径路由算法的特点并进行比较,最后归纳Ad hoc网络路由算法研究的重点和难点问题. 相似文献