This paper presents the derivation of an analytical model for a multi-queue nodes network router, which is referred to as the multi-queue nodes （mQN） model. In this model, expressions are derived to calculate two pe...This paper presents the derivation of an analytical model for a multi-queue nodes network router, which is referred to as the multi-queue nodes （mQN） model. In this model, expressions are derived to calculate two performance metrics, namely, the queue node and system utilization factors. In order to demonstrate the flexibility and effectiveness of the mQN model in analyzing the performance of an mQN network router, two scenarios are performed. These scenarios investigated the variation of queue nodes and system utilization factors against queue nodes dropping probability for various system sizes and packets arrival routing probabilities. The performed scenarios demonstrated that the mQN analytical model is more flexible and effective when compared with experimental tests and computer simulations in assessing the performance of an mQN network router.展开更多
为了更好地解决延迟容忍移动无线传感器网络(Delay Tolerant Mobile Sensor Network,DTMSN)中的数据收集问题,提出了一种基于节点优先级的数据转发策略NPD(Node Priority Data Delivery Scheme)。NPD根据计算得出的各节点不同的转发优...为了更好地解决延迟容忍移动无线传感器网络(Delay Tolerant Mobile Sensor Network,DTMSN)中的数据收集问题,提出了一种基于节点优先级的数据转发策略NPD(Node Priority Data Delivery Scheme)。NPD根据计算得出的各节点不同的转发优先级作为消息传输时选择下一跳的依据。为优化消息复本管理,NPD采用动态消息队列,并根据消息的生存时间决定消息的丢弃原则。仿真实验表明,与现有的几种DTMSN数据传输算法相比,NPD有更高的数据传输成功率与更小的传输延迟,并具有相对较长的网络寿命。展开更多
文摘This paper presents the derivation of an analytical model for a multi-queue nodes network router, which is referred to as the multi-queue nodes （mQN） model. In this model, expressions are derived to calculate two performance metrics, namely, the queue node and system utilization factors. In order to demonstrate the flexibility and effectiveness of the mQN model in analyzing the performance of an mQN network router, two scenarios are performed. These scenarios investigated the variation of queue nodes and system utilization factors against queue nodes dropping probability for various system sizes and packets arrival routing probabilities. The performed scenarios demonstrated that the mQN analytical model is more flexible and effective when compared with experimental tests and computer simulations in assessing the performance of an mQN network router.
文摘为了更好地解决延迟容忍移动无线传感器网络(Delay Tolerant Mobile Sensor Network,DTMSN)中的数据收集问题,提出了一种基于节点优先级的数据转发策略NPD(Node Priority Data Delivery Scheme)。NPD根据计算得出的各节点不同的转发优先级作为消息传输时选择下一跳的依据。为优化消息复本管理,NPD采用动态消息队列,并根据消息的生存时间决定消息的丢弃原则。仿真实验表明,与现有的几种DTMSN数据传输算法相比,NPD有更高的数据传输成功率与更小的传输延迟,并具有相对较长的网络寿命。
文摘路由器节点承载WMNs(Wireless Mesh Networks)的主要业务,决定网络的整体性能,其业务性能建模与分析是当前研究的热点内容。本文基于802.11 OFDM物理层计算的分组平均服务时间,采用排队论分析WMN路由器节点业务性能的理论模型,给出节点业务性能的计算方法,通过理论分析与仿真验证模型的准确性,并给出使用归一化的模型参数的简化计算方法。分析表明,在相对稳定的网络环境中,路由器节点的性能与业务到达模型相关,需要采用不同的模型和方法分析VBR(Variable Bit Rate)和CBR(Constant Bit Rate)业务的性能;在动态的网络中,节点性能与业务到达过程无关,采用泊松到达可以准确地分析不同业务的性能。本文建模的基础是分组平均服务时间,使分析模型与实际的网络形态无关;基于归一化参数的算法也增大了模型的适应性,使其可以应用在网络规划设计、业务接入控制和分组调度等诸多方面。
