Impact of Heterogeneity and Secrecy on theCapacity of Wireless Sensor Networks

摘要

This paper investigates the achievable secrecy throughput of an inhomogeneous wireless sensor network. We consider the impact of topology heterogeneity and the secrecy constraint on the throughput. For the topology heterogeneity, by virtue of percolation theory, a set of connected highways and information pipelines is established; while for the secrecy constraint, the concept of secrecy zone is adopted to ensure secrecy transmission. The secrecy zone means there is no eavesdropper around the legitimate node. The results demonstrate that, if the eavesdropper’s intensity is λe=ologn-3δ-4δ-2, a per-node secrecy rate of Ω1n1-v(1-v)logn can be achieved on the highways, where δ is the exponent of heterogeneity, n and n^v represent the number of nodes and clusters in the network, respectively. It is also shown that, with the density of the eavesdropper λe=olognΦ̲-2, the per-node secrecy rate of ΩΦ̲n can be obtained in the information pipelines, where Φ̲ denotes the minimum node density in the network.