共查询到15条相似文献,搜索用时 64 毫秒
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嵌套移动网络在扩大通信范围的同时会带来严重的路由优化问题。针对已有优化方案在可部署性和性能等方面的不足提出了一种新的嵌套移动网络路由优化方案(NMNRO),通过扩展邻居发现协议,在嵌套移动网络内通告相同的外地前缀,并更新接入路由器的邻居缓存和移动路由器的路由表,然后通过向对端发送绑定更新来实现路由优化。性能分析表明,该方案为嵌套移动网络提供了较为完整的路由优化方案,在降低优化开销的同时,具有较好的可部署性和兼容性。仿真实验结果表明该方案具有较低的切换时延和较高的有效吞吐量,且这些性能优势会随嵌套层数的增加而更加明显。 相似文献
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DSR路由协议中很多相邻节点的"路由应答"无法到达源节点,因此向这些节点广播"路由请求"产生了不必要的耗费.如果选择相对于源节点移动性较弱的相邻节点进行"路由请求",则可比较稳定地获得"路由应答".仿真结果显示,改进后的DSR(M-DSR)路由协议在路由发现时间、路由长度、路由错误、传播路由请求、路由应答等方面的性能较DSR路由协议有明显的改进. 相似文献
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Basavaraj Talwar Pallapa Venkataram Lalit M. Patnaik 《Wireless Personal Communications》2007,41(2):301-323
The paper presents a novel resource and service discovery mechanism for MANETs using Routing Intelligent Mobile Agents(RIMAs).
RIMAs periodically collect routing, resource and service availability information and index the same in appropriate RIMA nodes.
Every mobile node is close to atleast one RIMA node. The mobile node running an application in need of a resource or a service
dispatches a Discovery agent to its nearest RIMA node. The index available at the RIMA node will guide the Discoverer agent
to the resource or service node. Analysis of the method reveals the computational complexity to be of the order of square
of number of RIMA nodes. Communication overheads are the product of number of generated agents, agent size and number of hops
travelled by an agent. The method has been simulated and tested on MANETs of varying sizes from 50 to 800 nodes. Simulation
snapshots and results show the proper working and success of the algorithm.
Basavaraj Talwar is a Research Assistant at the Protocol Engineering & Technology Unit in Electrical Communication and Engineering department
in Indian Institute of Science, Bangalore, India. He is research interests include Applications of mobile agents in MANETs
and mobile commerce security.
Prof. Pallapa Venkataram is the Chief Programming Executive of Protocol Engineering & Technology Unit, Electrical Communication and Engineering department
in Indian Institute of Science, Bangalore, India. He has over 160 publications at various levels. His research interests include
Protocol Engineering, Mobile Agents, Mobile Commerce, Wireless Networks, Mobile Computing, Artificial Intelligence. He is
a senior member of IEEE and has received numerous awards and other fellowships for his contributions.
Prof. Lalit M. Patnaik is currently associated with Computer Science and Automation department in Indian Institute of Science, Bangalore, India.
He has currently over 400 publications at various levels. His research interests include Computer Architecture, Parallel &
Distributed Computing, CAD of VLSI Systems, Real-Time Systems, Soft Computing, Engineering Applications of Information Technology,
Mobile Computing, Computational Neuroscience. He is a fellow of IEEE and has received numerous awards and other fellowships
for his contributions. 相似文献
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《电子学报:英文版》2016,(5):841-847
This paper introduces a concept of User latent intentions (ULI) consisting of user preference intentions and user herd intentions for the expression of a user's personalized requirements of services.Theory of TCP-net and herd psychology is employed for the establishment of user preference decision model and user herd decision model,followed with a user-centric service discovery algorithm based on ULI.Simulation and experimental results demonstrate that the proposed ULI-based service discovery approach can increase the effectiveness of service discovery. 相似文献
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移动ad hoc网络中要求各节点问在缺乏预备知识的情况下进行相互通讯和协作,因此,对网络中各种服务的自动发现成为了其中的一个关键问题。将各节点的位置信息和DHT技术结合起来.提出了一种高效的面向移动ad hoc网络的服务发现方案。首先直接基于网络的物理拓扑结构来构建一种分布式哈希表.从而有效地消除了现有DHT方案的拓扑结构不匹配问题。然后提出了一种维度映射的方案.以将多维的服务描述信息映射到二维的哈希键值空间上。最后提出一种区域搜索算法,以高效地支持对服务的条件查询。 相似文献
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MDFNSSDP:基于最小转发节点覆盖集合的无线自组网服务发现协议 总被引:2,自引:0,他引:2
服务发现是在网络中寻找所需服务的技术,它是无线自组网的一项基本技术.本文提出了一个高效的无线自组网服务发现协议:MDFNSSDP.MDFNSSDP在转发服务需求包时能充分利用各项信息最大限度减少需要覆盖的2跳邻居节点数量,并选用最少的转发节点来覆盖这些2跳邻居,从而大大节约了信息包开销,提高了协议效率.MDFNSSDP能在一次服务发现会话中完成多个服务发现任务,并能保证服务发现会话的覆盖范围,这一点已经通过理论分析得到了证明.计算机仿真结果表明了MDFNSSDP的显著优越性. 相似文献
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邻居发现协议(NeighborDiscoveryProtocol,NDP)作为IPv6协议的重要组成部分,取代了IPv4中的ARP协议、ICMP路由发现和ICMP重定向功能。文章分析了NDP存在的安全问题,尤其是伪造IP地址攻击,并在此基础上提出采用加密生成地址和签名技术等来解决这些安全威胁。 相似文献
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Li Xuedong 《中国邮电高校学报(英文版)》1996,(2)
AStudyofTargetMarketandAdministrationTacticsofAdvertisementLetterService¥LiXuedong(DepartmentofPostalCommunicationManagementS... 相似文献