共查询到16条相似文献,搜索用时 93 毫秒
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衡量QoS组播路由主要性能指标有延时,代价,带宽等,本文所提出的基于遗传算法的多约束QoS组播路由优化算法.引入了一个综合性能指标Q适应度函数,对延时、带宽、代价这3个性能指标进行权衡.以减小组播树的代价和延时,增大带宽,提高组播的服务质量.并对解决传统算法对于存在两组及以上的组播树,他们的代价都是最优的,延时和带宽都满足受限条件时无法选择的问题十分有效的. 相似文献
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对具有带宽、延时、延时抖动约束的最小代价的QoS组播路由问题进行研究,提出了一种收敛速度快、全局性能好、不易陷入局部最优的智能迭代算法--量子粒子群算法来实现对该问题的求解.该算法采用整数编码方式,将路由优化问题转化成准连续优化,并采用惩罚函数处理约束条件.最后通过具体算例,对该算法进行了仿真验证,结果表明,在求解QoS组播路由问题时,量子粒子群算法要优于遗传算法、基本微粒群算法,从而验证了该算法的可行性和有效性. 相似文献
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Ad Hoc网络中一种基于QoS的分布式多播路由算法 总被引:6,自引:0,他引:6
通过分析Ad Hoe网络的特点及基于QoS的多播路由问题,提出了一种新的分布式多播路由算法。实验和分析的结果表明,文中构造的路由方案成功地解决了Ad Hoe网中基于QoS的多播路由问题。当Ad Hoe网络的拓扑结构改变不太快时,本文提出的路由方案不仅满足了实时业务对网络带宽和端到端延时的要求,优化了路由树的代价,而且有效地控制了算法的复杂性并可适用于大规模的网络中。 相似文献
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针对Ad Hoc网络中带QoS约束的多播路由问题,提出了一种新的结合MAODV多播路由发现方法和粒.子群优化算法的QoS多播路由发现算法。仿真试验显示该算法较好地改进了端到端传输的代价、延时和带宽利用率,能够找到一棵消耗趋于最小、状态稳定的多播路由树。 相似文献
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针对无线网络中资源受限的组播路由问题,考虑网络节点的节点度限制和网络链路的带宽约束,以最小化组播路由开销为目标,提出了一种二进制编码方式的基于灰狼优化算法的组播路由策略.在给定的网络拓扑下,基于灰狼优化算法的组播路由策略可以迅速找到一棵包含源和目的节点的最小开销组播树.仿真结果表明,相比于遗传算法,所提出的基于灰狼优化算法的组播路由策略可以得到一棵开销更小的组播树,并且在相同的时间复杂下具有更强的算法稳定性. 相似文献
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文章提出了一种基于概率的QoS多播路由遗传算法.该算法通过一种精度可控的次优化方法,解决了基 于非精确状态延时带宽限制代价最小的QoS多播路由问题.仿真实验表明,该算法能有效地屏蔽网络状态的非精确性,忍受较大的网络更新触发门限值,并保持较好的路由性能. 相似文献
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In this paper, a routing algorithm to optimize the selection of the best path for the transmitted data within the Internet of Things (IoT) system is proposed. The algorithm controls the use of ant colony ideas in the IoT system to obtain the best routing benefit. It divides the IoT environment into categorized areas depending on network types. Then, it applies the most suitable ant colony algorithm to the concerned network within each area. Furthermore, the algorithm considers routing problem in intersected areas that may arise in case of IoT system. Finally, Network Simulator 2 is used to evaluate the proposed algorithm performance. Simulation results demonstrate the effectiveness of the proposed routing algorithm in terms of end‐to‐end delay, packet loss ratio, bandwidth consumption, throughput, overhead of control bits, and energy consumption ratio. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
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In the context of multi‐protocol label switching (MPLS) traffic engineering, this paper proposes a scalable constraint‐based shortest path first (CSPF) routing algorithm with multiple QoS metrics. This algorithm, called the multiple constraint‐based shortest path first (M_CSPF) algorithm, provides an optimal route for setting up a label switched path (LSP) that meets bandwidth and end‐to‐end delay constraints. In order to maximize the LSP accommodation probability, we propose a link weight computation algorithm to assign the link weight while taking into account the future traffic load and link interference and adopting the concept of a critical link from the minimum interference routing algorithm. In addition, we propose a bounded order assignment algorithm (BOAA) that assigns the appropriate order to the node and link, taking into account the delay constraint and hop count. In particular, BOAA is designed to achieve fast LSP route computation by pruning any portion of the network topology that exceeds the end‐to‐end delay constraint in the process of traversing the network topology. To clarify the M_CSPF and the existing CSPF routing algorithms, this paper evaluates them from the perspectives of network resource utilization efficiency, end‐to‐end quality, LSP rejection probability, and LSP route computation performance under various network topologies and conditions. 相似文献
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有时延及时延差别约束的最小代价组播路由问题 总被引:6,自引:0,他引:6
本文把有时延、时延差别约束的组播路由问题提到优化的层次上,提出了有时延、时延差别约束的最小代价组播路由优化问题,并证明此问题是NP-complete问题。继而提出了一种基于动态罚函数法的启发式遗传算法以及解该问题,并分析了算法的复杂度。仿真表明,本文算法是有效的、稳定的。在满足两种约束的情况下,能够使网络代价优化。 相似文献