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多层异构蜂窝网安全威胁的特殊性,是由其各层的不统一性和复杂、非计划的拓扑结构所引起的.针对异构蜂窝网中的安全传输问题,本文结合随机几何工具和物理层安全技术,给出了(1)基站间无协作、仅宏基站参与协作和所有基站都参与协作的3种不同场景,(2)协作基站与用户之间有/无信道测量的两种不同机制下的异构蜂窝网安全覆盖概率和平均安全速率的表达式.并对服务基站用于发射人工噪声干扰的功率比例、协作功率中用于发射协作干扰的功率比例、安全速率门限、宏基站发射天线数和窃听者密度等不同参数对于用户安全性能所产生的影响进行了仿真分析.以此为基础得出了在不同场景下,以安全性能为导向的协作传输和协作干扰策略.
The particularity of multi-layer heterogeneous cellular network security threats is caused by the non-uniform and complex, unplanned topologies of all layers.Aiming at the problem of secure transmission in heterogeneous cellular networks, this paper combines the random geometric tools and (1) 3 different scenarios where there is no cooperation between base stations, only macro base stations are involved in the cooperation and all base stations are involved in the cooperation. (2) There are two kinds of measurements with / without channel cooperation between the base station and users Different mechanisms of heterogeneous cellular network security coverage probability and average security rate of expression.And the service base station for transmitting artificial noise interference power ratio, the cooperative power for transmitting cooperative interference power ratio, the security rate threshold, Acer The number of transmitting antennas and the number of eavesdroppers on the safety performance of the users are simulated and analyzed.On the basis of the simulation results, the cooperative transmission and cooperative interference strategies based on the security performance are obtained under different scenarios.