5G超密集网络环境下功率控制方案研究

Research on Power Control Scheme in 5G Ultra-dense Network

超密集网络(Ultra Dense Network,UDN)是一种通过密集化地部署各种低功率小基站来提升系统容量的技术,因可以解决小区覆盖盲区、实现用户无缝连接、缓解宏基站压力以及配置灵活等优点被列为未来5G通信系统的关键技术之一。在密集基站的网络部署下,基站与终端的路径损耗有所降低,在增大有益信号的同时也提升了干扰信号,影响通信系统的性能和用户终端的服务质量。为提升用户的服务质量和降低系统损耗,提出了一种跨层功率最大化方案,选取发射功率最强的小基站作为服务基站。提出一种协作功率最大化控制方案,选取2个小基站为用户提供协作式数据传输服务。仿真结果表明,2种方案均能提升用户的服务质量,后者在能效等指标上要优于前者。

The Ultra Dense Network(UDN) is a kind of technology to improve the system capacity through intensive deployment of various low-power small base stations(SBS).Owing to such characteristics as blind zone elimination,seamless user connection,macro base station stress mitigation and flexible configuration,etc.,UDN is ranked as one of the key techniques in future 5 G communication systems.Although the path loss between base station and the user equipment has been reduced under the circumstance of such dense SBS deployment,the interference signal will increase with the enhancement of beneficial signal,which can affect the performance of the communication system and the service quality of user equipment.In order to improve the quality of service and reduce the loss of the system,a cross layer power maximization scheme is proposed.In this scheme,one small base station with the strongest transmitting power is selected as its service base station.In addition,a cooperative power maximization control scheme is proposed,in which two small base stations are selected to provide collaborative data transmission services for users.The simulation results show that the two proposed schemes can improve the service quality of users,and the latter is superior to the former in terms of energy efficiency.