联合传输机制下的三维超密集网络性能分析

Performance Analysis of 3D-UDN with Joint Transmission Scheme

超密集网络(Ultra-dense Networks,UDN)作为一项新兴技术,通过密集部署微基站大幅提升了网络容量,近年来受到了广泛关注。但随着二维平面基站数量逐渐饱和,基站部署逐渐向三维(3D)立体化发展。因此,针对中央商务区(Central Business District,CBD)等未来移动通信典型应用场景,基于随机几何理论对写字楼中基站与用户的分布进行建模与分析。该场景下,考虑到实际部署情况,用户只会接收到其上方基站的信号,而忽略低楼层基站的影响。针对这一特点,基于联合传输(Joint Transmission,JT)方案的覆盖性能,推导出用户的覆盖率和遍历容量解析表达式。结果表明,覆盖率和遍历容量都随协作簇的变大而增加,收益呈递减状态。

As an emerging technology,UDN(Ultra-Dense Network)dramatically increases network capacity through dense deployment of micro-base stations,and has received a lot of attention in recent years.However,as the number of base stations on two-dimensional plane reaches saturation,the deployment of base stations gradually develops to three-dimensionality.Therefore,this paper focuses on the typical application scenarios of future mobile communication such as CBD(Central Business District),and models and analyzes the distribution of base stations and users in office buildings based on stochastic geometry theory.In this scenario,considering the actual deployment,users will only receive signals from the base station above them and ignore the effect of the base station on the lower floors.For this reason,based on the coverage performance of the JT(Joint Transmission)scheme,the analytic expressions of user’s coverage and ergodic capacity are derived.The results indicate that both coverage and ergodic capacity increase as the collaborative clusters become larger,and the return is decreasing.