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移动Ad Hoc网络的连通可靠性对于战场的指挥控制、警察与医疗部门的抢险救灾等众多领域具有重要意义。然而当前的移动Ad Hoc网络连通可靠性评估方法大多建模简单,考虑因素单一,而以OPNET为代表的网络仿真只针对网络普通性能分析而没有可靠性分析。因此,目前缺少一种能够涵盖真实场景中节点移动、无线通信特性和复杂地形环境的移动Ad Hoc网络连通可靠性评价方法。针对此问题提出了多因素模型连通可靠性仿真方法,同时结合可靠性定时标准实验方法给出了系统的移动Ad Hoc网络可靠性仿真实验设计方案。并根据具体移动Ad Hoc网络案例,在OPNET中进行二次开发建模与仿真,验证了该多因素连通可靠性仿真方法的可行性。 相似文献
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Ad Hoc网络关键技术及应用 总被引:3,自引:0,他引:3
Ad hoc网络是一种新型无线移动网络.详细分析了Ad hoc网络的关键技术,描述了它的应用范围,并在此基础上指出了它的发展前景. 相似文献
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As an important part of future 5G wireless networks,a vehicular network demands safety,reliability and connectivity.In this context,networking survivability is usually considered an important metric to evaluate network performance.In this paper,we propose a survivability model for vehicle communication networking based on dual cluster heads,wherein a backup cluster head(CH)will be activated if the primary CH fails,thereby effectively enhancing the network lifetime.Additionally,we introduce a software rejuvenation strategy for the prime CH to further improve the survivability of the entire network.Using the Probabilistic Symbolic Model Checker(PRISM),we verify and discuss the proposed survivability model via numerical simulations.The results show that network survivability can be effectively improved by introducing an additional CH and further enhanced by adopting the software rejuvenation technique. 相似文献
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可生存网络系统的形式化定义 总被引:8,自引:0,他引:8
随着大规模、分布式网络系统对信息安全需求的进一步提高,其安全问题的研究重点已转移为网络系统的可生存性研究.那么,首要问题是建立统一、规范的网络系统的可生存性定义.文中从网络系统的可生存需求出发,借鉴了近年来国内外的可生存研究成果,提出了规范化的网络系统的可生存性定义,并给出其形式化的描述及其实现模型,为下一阶段的系统可生存性的定量分析提供统一、规范的可生存性定义. 相似文献
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This paper formulates a general framework that includes and extends the existing definitions for network survivability. Based on this framework, network survivability is characterized by a survivability function rather than a single-value survivability measure, and various quantities of interest can be derived from the function. Examples are the expected survivability, the worst-case survivability, the r-percentile survivability, and the probability of zero survivability. The survivability function is especially useful for the study of large-scale disasters. For illustration, the authors derive the survivability function in closed form for a simple ring network under link failures. They also discuss the general procedure for finding survivability functions for complex networks, and show that the survivability function reveals useful information about a network. This framework provides a unified and practical approach to analyzing and designing highly survivable communications networks 相似文献
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Wojtek Bigos Bernard Cousin Stphane Gosselin Morgane Le Foll Hisao Nakajima 《Optical Switching and Networking》2006,3(3-4):202-218
In this paper we study different options for the survivability implementation in MPLS over Optical Transport Networks (OTNs) in terms of network resource usage and configuration cost. We investigate two approaches to the survivability deployment: single-layer survivability, where some recovery mechanism (e.g. protection or restoration) is implemented in a single network layer and multilayer survivability, where recovery is implemented in multiple network layers. The survivable MPLS over OTN design is implemented as a static network optimization problem and incorporates various methods for spare capacity allocation (SCA) to reroute disrupted traffic.The comparative analysis between the single layer and the multilayer survivability shows the influence of the traffic granularity on the survivability cost: for high-bandwidth LSPs, close to the optical channel capacity, the multilayer survivability outperforms the single layer one, whereas for low-bandwidth LSPs the single-layer survivability is more cost-efficient. For the multilayer survivability we demonstrate that by mapping efficiently the spare capacity of the MPLS layer onto the resources of the optical layer one can achieve up to 22% savings in the total configuration cost and up to 37% in the optical layer cost. Further savings (up to 9%) in the wavelength use can be obtained with the integrated approach to network configuration over the sequential one; however, this is at the increase in the optimization problem complexity. These results are based on a cost model with current technology pricing and were obtained for networks targeted to a nationwide coverage. 相似文献
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The explosive growth of data traffic imposes critical requirements on core network survivability. Developments in wavelength-division multiplexing have strengthened this need. Survivability becomes increasingly crucial, since large traffic volumes are multiplexed onto a single fiber. A single cable cut can affect incredibly large groups of users, leading to catastrophic socioeconomic effects. This paper defines the network survivability function - the probability function of the percentage of total data flow delivered after failure and survivability attributes - the expected percentage of total data flow delivered after failure, the respective p-percentile values, the worst case survivability. Models for finding these survivability measures are described. The main goal in this paper is to investigate the survivability function for typical routing protocols used in the IP networks. Examples of survivability assessment of a typical wide area network employed in Poland illustrate the proposed approach. 相似文献
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提出了基于管理技术的ATM网络抗毁性组织结构概念,指出了在网络规划设计与维护管理阶段进行层次化技术处理的重要性。ATM网络抗毁性组织结构要求在网络规划设计阶段、运用各种规划算法和仿真技术进行抗毁性设计与验证;在网络管理维护阶段,从网络各个层次,运用各种管理算法或机制维护网络抗毁性。在网络实际运行过程当中,该组织结构强调联合应用网络各层次上的抗毁性管理技术,充分发挥各个层次上的抗毁性,以提高整个网络抗毁性能。 相似文献
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针对通信网网络优化设计提出了一种在网络抗毁性指标和网络最小费用之间进行均衡、折衷的优化设计方法。分析了通信网络的特点和设计要素,在此基础上提出了将通信网络进行模型化的方法,根据模型化后的图求出最小费用的连通网络结构,在尽量减少费用的前提下进行抗毁设计的修改。通信网络优化设计的最终设计目标是具有一定抗毁性指标且费用最少的网络拓扑结构。 相似文献