【作者】 官权升；

【导师】 姜胜明；

【作者基本信息】 华南理工大学 ， 通信与信息系统， 2011， 博士

【摘要】 移动自组织网络(Mobile Ad Hoc Network, MANET)可以快速低成本地组网,其运转不依赖于任何基础设施,具有自组织自愈性等优点。它最初为临时场合提供应急通信,伴随着技术的不断成熟,它将发挥越来越大的作用。动态变化的拓扑结构是移动自组织网络的一个重要特点,而网络拓扑对网络性能有着极大的影响。所以本文着重研究拓扑控制方法以优化网络性能,内容包括如下:1)节点的能量是移动自组织网络的一个重要资源,决定着网络的寿命。而网络中数据传输的能耗取决于传输的路径。因此,本文提出最小能耗路径的拓扑控制算法。该算法仅利用本地信息保证网络的连通性,并保留网络中任意两个节点间的最小能耗路径,以提高数据传输的能耗效率;2)网络容量是无线网络的一个重要因素。本文推导出网络容量的一个闭合表达式,得出网络拓扑与网络容量的关系,并提出一种网络容量优化的拓扑控制算法。该算法引入协作通信以提高无线信道的容量和可靠性,并选择合适的传输方式和中继节点以降低网络的干扰,以达到优化网络容量的目的。该算法能适应动态随机的无线信道和动态变化的网络拓扑;3)路由效率在很大程度上受拓扑稳定性的影响。拓扑的动态变化频繁地触发了重路由操作,造成了网络广播风暴,降低了路由效率。而拓扑的动态性在认知移动自组织网络中更加明显。为此,本文提出基于预测的认知拓扑控制算法,通过对链路生存时间的预测,为路由协议提供认知能力,提高认知移动自组织网络的路由效率;4)不恰当的安全协议配置会消耗大量的网络资源,尤其在协作通信移动自组织网络中这个问题显得更加突出。安全协议与拓扑控制的联合设计可以从全网的角度综合配置网络资源,优化网络性能。本文在分析和改进一种认证协议的基础上,提出一种拓扑控制和认证协议的联合优化算法,以在不降低原认证协议安全性能的前提下,提高协作通信网络的吞吐量。更多还原

【Abstract】 The self-organizing Mobile Ad Hoc Networks (MANETs) can be deployed fleetly sinceno infrastructure is required for the network construction. Initially, MANETs are designed toprovide emergency communications for temporary scenarios. As the technology advancing,MANETs will find more and more applications in the future.The dynamic changing topology, which is one of the most perceptible characteristics ofMANETs, has a significant impact on the network performance. To this end, this dissertationfocuses on designing topology control mechanisms to optimize the network performance. Thecontribution of this dissertation includes:1) As an important resource, the energy of nodes determines the network lifetime. Sincethe energy consumption of data transmissions is affected by the transmission paths, wepropose a minimum energy path based topology control algorithm. The algorithm pre-serves both network connectivity and the minimum energy paths between any pair ofnodes with only local neighborhood information, and improves the energy efficiency forend-to-end data transmissions.2) Network capacity is the second main issue to be addressed here since it is the key re-source of wireless networks. This dissertation derives a closed-form equation for the net-work capacity in MANETs, and further studies the relation between network topologyand network capacity. Based on the analytical result, we propose a network capacity-optimized topology control algorithm. The algorithm introduces cooperative communi-cations to improve the capacity and reliability of wireless channels, and configure the linkconnections by selecting the appropriate transmission method and relay node to moder-ate the network interference. Furthermore, it can be applied to MANETs directly, whichrequires topology reconfigurations frequently due to the unreliable wireless channels andnode mobility.3) Network topology determines the efficiency of routing protocols to a large extent sincerouting is based on the network topology. The frequent re-routing operations caused bydynamic topology will not only introduce broadcast storms to the network, but also de-graderoutingefficiency. SincethisproblemwillbemoresevereinCognitiveRadio(CR)- MANETs,thisdissertationproposesaprediction-basedtopologycontrolalgorithm,whichcan construct a reliable network topology by predicting the link available time. It enablesrouting protocols to have cognitive ability for the dynamic the environment to improvethe performance of CR-MANETs.4) An inappropriate configuration of security protocols may consume a large amount ofnetwork resources, particularly in MANETs using cooperative communications. A jointdesign of security protocols and topology control can allocate the network resources ina network-wide perspective and optimize the entire network performance. This disserta-tionanalysesthethroughputofanauthenticationprotocolandenhancestheauthenticationprotocol for MANETs using cooperative communications. Then a topology control basedapproach is proposed to jointly optimize the authentication protocol and network perfor-mance without compromising communication security.更多还原