Secure User Association in Two-Tier Heterogeneous Cellular Networks With In-Band Interference

In this paper, we address the issue of security-concerned user association in two-tier heterogeneous cellular networks with in-band interference. Different from the maximum secrecy capacity association (max-SC), which studied multi-tier heterogeneous networks without in-band interference, we consider the max-SC problem with in-band interference. Considering the intractability of the max-SC scheme under in-band interference scenario, we derive a simplified max-SC scheme based on the Maclaurin formulation. Network connection and secrecy probability, as well as network secrecy throughput, are analyzed under our association scheme through stochastic geometry. Simulation results demonstrate that the proposed scheme can approach the performance of the max-SC association, in terms of secrecy probability and network secrecy throughput, and performs better in terms of connection probability. Comparing with the previous work, the proposed scheme performs better in connection, secrecy probability, and secrecy throughput.