A link quality estimation model for energy-efficient wireless sensor networks
A link quality estimation model for energy-efficient wireless sensor networks
复制标题
DOI：
10.1109/icc.2015.7249392
复制
发表时间：
2015-06
期刊：
影响因子：
--
通讯作者：
Jianjun Wen;Zeeshan Ansar;W. Dargie
中科院分区：
文献类型：
--
作者：
Jianjun Wen;Zeeshan Ansar;W. Dargie
了解无线传感器网络中链路质量的波动有着不同的原因。例如，节点可以确定它们应该在何时传输分组以及传输分组多长时间，使得它们可以降低分组丢失率和重传成本（延迟以及功耗）。然而，由于链路的质量取决于许多因素，因此除了概率意义外，无法知道链路的质量。在本文中，我们估计的预期持续时间，在其中一个特定的链路的质量保持稳定，使用接收到的确认数据包的信噪比（SNR）的条件分布函数。我们采用预期的持续时间来确定多长时间节点应该发送数据包在突发和多长时间内，他们应该避免竞争。为了开发我们的模型，我们在室内和室外部署了Imote2传感器平台，并传输了超过70，000个数据包。我们发送了额外的16，900个数据包来测试我们的模型。90%的时间，我们的方法导致高数据包传输的情况下，其中数据包传输没有知识的链路质量波动相比。
Understanding fluctuations of link quality in a wireless sensor network is useful for different reasons. For example, nodes can determine when and for how long they should transmit packets, so that they can reduce packet loss rate and the cost of retransmission (delay as well as power consumption). However, because the quality of a link depends on many factors, it cannot be known except in a probabilistic sense. In this paper we estimate the expected duration in which the quality of a specific link remains stable using the conditional distribution function of the signal-to-noise ratio (SNR) of received acknowledgment packets. We employ the expected duration to determine how long nodes should transmit packet in burst and how long they should refrain from contention. To develop our model, we deployed Imote2 sensor platforms in indoor and outdoor places and transmitted more than 70, 000 packets. We transmitted additional 16,900 packets to test our model. 90% of the time, our approach resulted in high packet delivery compared with the case in which packets were transmitted without knowledge of link quality fluctuations.