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Energy efficiency and reliability in wireless sensor networks.

机译：无线传感器网络中的能源效率和可靠性。

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摘要

Motivated by their tremendous potentials in civil and military applications, wireless sensor networks have raised tremendous research interests in recent years. The fundamental function of wireless sensor networks is the gathering of information from a covered area. Information thus gathered by the sensor nodes are processed by the sink nodes according to the applications deployed in the network. Therefore, delivering information from sensor nodes to sink nodes effectively is one of the fundamental challenges in wireless sensor networks. To achieve flexibility in deployment, sensor nodes are generally battery-driven. Furthermore, battery replacement is very difficult, if at all possible, due to the random deployment nature of wireless sensor networks. Thus, sensor nodes have limited operational time and the operational time of the sensor networks is also limited. Hence, energy efficiency is another fundamental challenge in wireless sensor networks. To improve the performance of wireless sensor networks, data delivery should be both energy efficient and effective, which is the focus of this thesis.;First, we observe the conflict of the two objectives -viz., the application performance and the network lifetime---when optimizing the performance of wireless sensor networks. We find that the tradeoff between them can be studied by investigating the interaction between the network lifetime maximization problem and the rate allocation problem. Then, we formulate the tradeoff problem as a constrained convex optimization problem by introducing a tradeoff factor. We first tackle this problem at the transport layer, and then from a cross layer perspective. Using Lagrange dual decomposition, algorithms are obtained to achieve the best tradeoff. Then, we note that the notion of reliability in certain wireless sensor networks is probabilistic. Based on this, the problem of providing minimum energy probabilistic reliable data delivery is studied. First we tackle the problem at the MAC layer, using p-persistent CSMA protocols. We derive adaptive algorithms to tune the persistence probabilities of these p-persistent CSMA protocols. Then, we obtain the optimal allocation of per-hop reliability requirements, which further reduces the energy consumption with adaptive p-persistent CSMA protocols at the MAC layer.
机译：由于其在民用和军事应用中的巨大潜力，无线传感器网络近年来引起了巨大的研究兴趣。无线传感器网络的基本功能是从覆盖区域收集信息。由传感器节点收集的信息由宿节点根据网络中部署的应用进行处理。因此，有效地将信息从传感器节点传递到接收器节点是无线传感器网络的基本挑战之一。为了实现部署的灵活性，传感器节点通常由电池驱动。此外，由于无线传感器网络的随机部署特性，如果可能的话，更换电池非常困难。因此，传感器节点的操作时间有限，并且传感器网络的操作时间也受到限制。因此，能源效率是无线传感器网络中的另一个基本挑战。为了提高无线传感器网络的性能，数据传输应既节能又有效，这是本文的重点。首先，我们观察到了两个目标之间的冲突，即应用性能和网络寿命。 -当优化无线传感器网络的性能时。我们发现，可以通过研究网络寿命最大化问题和速率分配问题之间的相互作用来研究它们之间的折衷。然后，通过引入权衡因子，将权衡问题公式化为约束凸优化问题。我们首先在传输层解决此问题，然后再从跨层的角度解决。使用拉格朗日对偶分解，获得算法以获得最佳折衷。然后，我们注意到某些无线传感器网络中的可靠性概念是概率性的。基于此，研究了提供最小能量概率可靠数据传递的问题。首先，我们使用p持久CSMA协议在MAC层解决问题。我们得出自适应算法来调整这些p持久CSMA协议的持久性概率。然后，我们获得了每跳可靠性要求的最佳分配，从而通过MAC层上的自适应p持久CSMA协议进一步降低了能耗。

著录项

  • 作者

    Zhu, Junhua.;

  • 作者单位

    Hong Kong University of Science and Technology (Hong Kong).;

  • 授予单位 Hong Kong University of Science and Technology (Hong Kong).;
  • 学科 Computer Science.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 133 p.
  • 总页数 133
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 自动化技术、计算机技术;
  • 关键词

  • 入库时间 2022-08-17 11:38:24

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