共查询到19条相似文献,搜索用时 62 毫秒
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为了深入研究分布式认知无线电网络的多路径路由问题,阐述了分布式认知无线电网络基本特征以及多路径路由设计面临的问题与挑战。分布式认知无线电网络多路径路由采用多路径并行传输,可有效降低传输时延、增加网络吞吐量与传输可靠性、实现网络负载均衡。根据路由优化目标不同,从吞吐量、带宽、干扰、时延、负载均衡和路由发现六方面对近年来多路径路由协议的主要研究成果进行了分类,然后逐类对多路径路由协议进行了分析和讨论,最后分别从分布式认知无线电网络基本特征的适应性与多路径路由协议特征两个方面进行了比较,并展望了分布式认知无线电网络多路径路由协议需进一步研究的方向。 相似文献
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OSPF协议在发布静态路由时的问题解析 总被引:1,自引:0,他引:1
OSPF(Open Shortest Path First,开放式最短路径优先)路由协议以其支持大型网络、路由收敛快、占用资源少等优点在当前互联网应用中占据了重要地位;然而,相对于目前使用最为广泛的IGP,OSPF仍然存在一些不完善的地方。在OSPF中发布其引入的静态路由时,存在路由无法被正常发布的问题,一旦组网不合理或数据制作时不加注意,就会导致所发布静态路由网段内的业务全部中断。 相似文献
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路由是网络互联技术的重要组成部分,不同的网络协议相应有不同的路由选择协议,这些路由选择协议的基本原理是一致的。本文给出了路由选择技术的基本原理,着重分析了路由算法的设计目标、分类、衡量标准及两类基本算法:V-D算法和SPF算法。 相似文献
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通过路由协议,路由器可以动态适应网络拓扑结构的变化,并找到到目的网络的最佳路径。RIP使用简单,配置灵活,在很多网络系统如Internet、Appletalk、Novell中得到了实现和应用。现在,Internet上的主要内部网关协议是OSPF。RIP与OSPF同属路由器的内部网关协议,但两者之间有许多不同之处。概括起来,这些不同之处可以用三个“W”来表示。 相似文献
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环境监测系统是一个分布式系统,采用无线传感器网络进行数据传输和管理对于边远地区或高度分散的系统具有重要应用价值。考虑到分布式环境监测系统的特点,文中采用了比对时间同步算法和角度随机路由协议,使得网络同步精度、能耗以及多跳性能都有所改进。 相似文献
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Lei Shi Zheng Yao Baoxian Zhang Cheng Li Jian Ma 《International Journal of Communication Systems》2015,28(11):1789-1804
Introducing mobile sinks into a wireless sensor network can effectively improve the network performance. However, sink mobility can bring excessive protocol overhead for route maintenance and may offset the benefit from using mobile sinks. In this paper, we propose a dynamic layered routing protocol to address this problem. The proposed protocol integrates dynamic layered Voronoi scoping and dynamic anchor selection to effectively reduce the dissemination scopes and frequencies of routing updates as the sinks move in the network. Simulation results show that the proposed protocol can effectively reduce the protocol overhead while ensuring high packet delivery ratio as compared with existing work. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
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针对低功耗有损网络(Low Power and Lossy Network, LLN)中移动节点作为中继节点时,存在无线链路易断开、数据传输成功率较低和控制开销较高的问题,提出了一种快速低开销的移动节点分布式寻路RPL路由协议(Mobile Node Distributed Pathfinding RPL Routing Protocol, MNA-RPL)。首先,提出一种邻居表自适应更新机制,依据邻居表快速切换父节点;其次,提出一种父子节点双断开机制,能够有效减少数据包丢失;最后,提出一种基于速度动态管理的Trickle计时器,根据自身速度动态调整DIO广播周期。理论分析和仿真结果表明,与主流路由协议相比,该协议在数据传输和控制开销等方面的性能均有一定的提升。 相似文献
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Considering severe resources constraints and security threat hierarchical routing protocol algorithm. The proposed routing of wireless sensor networks (WSN), the article proposed a novel protocol algorithm can adopt suitable routing technology for the nodes according to the distance of nodes to the base station, density of nodes distribution, and residual energy of nodes. Comparing the proposed routing protocol algorithm with simple direction diffusion routing technology, cluster-based routing mechanisms, and simple hierarchical routing protocol algorithm through comprehensive analysis and simulation in terms of the energy usage, packet latency, and security in the presence of node protocol algorithm is more efficient for wireless sensor networks. compromise attacks, the results show that the proposed routing 相似文献
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Yin Min Yu Quan Tang Yao 《电子科学学刊(英文版)》2006,23(3):444-448
Military tactical network is one of the most important applications of ad hoc network. Currently the existing routing protocols are put forward based on the simple and universal network model which has the ability of multi-hop routing but cannot work efficiently in the special military applications. The narrow bandwidth and limited energy of the wireless network make general routing protocols seem to be more redundant. In order to satisfy military needs properly, this letter makes a detailed analysis of physical nodes and traffic distribution in military network, uses cross-layer design concept for reference, combines traffic characteristic of application layer with routing protocol design. It categorized routing problem as crucial routes and non-crucial routes which adopted separate maintenance methods. It not only realizes basic transmission function but also works efficiently. It is quite fit for military application. 相似文献