安全约束下异构蜂窝网联合负载均衡与资源分配方法

Load Balance and Resource Allocation Based on Security Constraints in Heterogeneous Cellular Networks

针对安全约束下的多层异构蜂窝网负载不均衡、干扰极为复杂的问题,在为卸载用户划分专用资源的基础上,合理配置系统参数以提升网络的安全速率。首先采用随机几何工具对不同类型的基站建模,为小基站的接收功率添加正偏置以卸载宏基站的负载,并为卸载用户分配专用资源提升边缘用户的SINR;然后建立相应场景下物理层安全模型并推导出用户的安全速率表达式,通过数值仿真分析得出最大化安全通信时的偏置值和资源划分因子等参数。仿真结果表明,通过联合添加偏置和资源划分能够有效提升安全速率,对网络安全通信优化有一定的指导意义。

With focus on load imbalance, complex interference and security problem in heterogeneous cellular networks, this paper improves network security rate with rational system configuration on the basis of dedicated resource partitioning for offloaded users. Firstly, models suited for different stations are built with stochastic geometry. We offload macro cell users through a positive association bias for small base station and enhance SINR of edge users through the allocation of dedicated resources. Then, the user＇ s security rate function is derived from the corresponding established physical layer security model, and the optimal bias and resource partition factor are obtained through numerical calculation and analysis. Simulation results show the effectiveness of joint offloading and re- source partitioning on security rate. Our work provides references for security communication optimization.