采用随机几何工具的终端直通通信接入控制方法

Access control method for device-to-device communications based on stochastic geometry

针对现有具备终端直通(Device-to-Device,D2D)功能的蜂窝网络的干扰管理问题,提出一种新型的采用随机几何工具的D2D通信接入控制方法。利用随机过程理论以及随机几何工具建立模型分析邻近基站和D2D通信对蜂窝通信的影响,并推导蜂窝业务接入失败概率表达式。基于该表达式能够计算网络允许的最大D2D用户密度,辅助D2D通信接入控制实现干扰管理。仿真证明基于所提数值计算方法获得的估计结果与蒙特卡洛仿真结果相符,且通过合理限制D2D用户密度和D2D用户发射功率可满足指定的蜂窝业务接入失败概率要求。

In order to solve the problem of the interference management in D2D(device-to-device) underlaid cellular networks,a new design of stochastic geometry based access control for D2D communications was proposed. Based on the stochastic process theory and the stochastic geometry tool,the cellular services′ access failure probability expression was derived to determine the impact from other-cell base stations and D2D communications on the cellular communication. Given the constraint of access failure probability,the maximum D2D transmitters density was calculated according to the expression. As a result,the base stations realized the access control for D2D users and guaranteed the access failure probability of cellular services. The calculated access failure probability of cellular services was validated by extensive simulations. The simulation results verify that the estimation result from the proposed numerical calculation is consistent with the Monte Carlo simulation result,and the cellular services′ access failure probability requirement can be satisfied by limiting the density and the transmission power of D2D transmitters.