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Performance analysis and optimization of query-based wireless sensor networks.

机译：基于查询的无线传感器网络的性能分析和优化。

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摘要

This dissertation is concerned with the modeling, analysis, and optimization of large-scale, query- based wireless sensor networks (WSNs). It addresses issues related to the time sensitivity of in- formation retrieval and dissemination, network lifetime maximization, and optimal clustering of sensor nodes in mobile WSNs. First, a queueing-theoretic framework is proposed to evaluate the performance of such networks whose nodes detect and advertise significant events that are useful for only a limited time; queries generated by sensor nodes are also time-limited. The main performance parameter is the steady state proportion of generated queries that fail to be answered on time. A scalable approximation for this parameter is first derived assuming the transmission range of sensors is unlimited. Subsequently, the proportion of failed queries is approximated using a finite transmission range. The latter approximation is remarkably accurate, even when key model assumptions related to event and query lifetime distributions and network topology are violated.;Second, optimization models are proposed to maximize the lifetime of a query-based WSN by selecting the transmission range for all of the sensor nodes, the resource replication level (or time-to- live counter) and the active/sleep schedule of nodes, subject to connectivity and quality-of-service constraints. An improved lower bound is provided for the minimum transmission range needed to ensure no network nodes are isolated with high probability. The optimization models select the optimal operating parameters in each period of a finite planning horizon, and computational results indicate that the maximum lifetime can be significantly extended by adjusting the key operating parameters as sensors fail over time due to energy depletion.
机译：本文涉及大规模的基于查询的无线传感器网络（WSN）的建模，分析和优化。它解决了与信息检索和分发的时间敏感性，网络寿命最大化以及移动WSN中传感器节点的最佳群集有关的问题。首先，提出了一种队列理论框架来评估这种网络的性能，这些网络的节点检测并发布仅在有限时间内有用的重要事件。传感器节点生成的查询也是有时间限制的。主要性能参数是无法按时回答的生成查询的稳态比例。假设传感器的传输范围不受限制，则首先导出此参数的可缩放近似值。随后，使用有限的传输范围来估计失败查询的比例。即使违反了与事件和查询生存期分布以及网络拓扑有关的关键模型假设，后一种近似也非常准确。其次，提出了优化模型，通过为所有WSN选择传输范围来最大化基于查询的WSN的生存期。传感器节点，资源复制级别（或生存时间计数器）以及节点的活动/睡眠时间表，这取决于连接性和服务质量约束。为确保没有网络节点被高概率隔离所需的最小传输范围提供了改进的下限。优化模型在有限的计划范围内的每个周期中选择最佳操作参数，并且计算结果表明，由于传感器由于能量耗尽而随着时间的推移出现故障，因此可以通过调整关键操作参数来显着延长最大使用寿命。

著录项

  • 作者

    Degirmenci, Guvenc.;

  • 作者单位

    University of Pittsburgh.;

  • 授予单位 University of Pittsburgh.;
  • 学科 Applied Mathematics.;Engineering Industrial.
  • 学位 Ph.D.
  • 年度 2013
  • 页码 121 p.
  • 总页数 121
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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