Physical Layer Security in Three-Tier Wireless Sensor Networks: A Stochastic Geometry Approach
Physical Layer Security in Three-Tier Wireless Sensor Networks: A Stochastic Geometry Approach
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DOI：
10.1109/tifs.2016.2516917
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发表时间：
2016-06-01
影响因子：
6.8
通讯作者：
Mallik, Ranjan K.
中科院分区：
文献类型：
--
作者：
Deng, Yansha;Wang, Lifeng;Mallik, Ranjan K.
本文开发了一个易于处理的框架，用于利用随机几何结构的三层无线传感器网络 (WSN) 中物理层安全的潜在优势。在此类网络中，来自远程传感器的感测数据由接收器在接入点的帮助下收集，并且外部窃听者拦截数据传输。我们关注两种情况下的安全传输：1）主动传感器将其传感数据传输到接入点，2）主动接入点将数据转发到接收器。我们为这两种情况下的平均保密率推导了新的紧凑表达式。我们还推导了总体平均保密率的新紧凑表达式。数值结果证实了我们的分析，并表明接入点的多个天线可以增强三层 WSN 的安全性。我们的结果表明，增加接入点数量会降低接入点与其关联接收器之间的平均保密率。然而，我们发现，增加接入点的数量首先会增加总体平均保密率，达到一个临界值后，总体平均保密率就会下降。当增加活动传感器的数量时，传感器及其关联接入点之间的平均保密率以及总体平均保密率都会降低。相反，增加接收器的数量可以提高接入点及其关联接收器之间的平均保密率以及总体平均保密率。
This paper develops a tractable framework for exploiting the potential benefits of physical layer security in three-tier wireless sensor networks (WSNs) using stochastic geometry. In such networks, the sensing data from the remote sensors are collected by sinks with the help of access points, and the external eavesdroppers intercept the data transmissions. We focus on the secure transmission in two scenarios: 1) the active sensors transmit their sensing data to the access points and 2) the active access points forward the data to the sinks. We derive new compact expressions for the average secrecy rate in these two scenarios. We also derive a new compact expression for the overall average secrecy rate. Numerical results corroborate our analysis and show that multiple antennas at the access points can enhance the security of three-tier WSNs. Our results show that increasing the number of access points decreases the average secrecy rate between the access point and its associated sink. However, we find that increasing the number of access points first increases the overall average secrecy rate, with a critical value beyond which the overall average secrecy rate then decreases. When increasing the number of active sensors, both the average secrecy rate between the sensor and its associated access point, and the overall average secrecy rate decrease. In contrast, increasing the number of sinks improves both the average secrecy rate between the access point and its associated sink, and the overall average secrecy rate.