HetNet场景下基于时延的多基站协作传输方法

摘要

小基站的部署有效提高了无线网络的覆盖范围和系统容量，多点协作传输（ CoMP ）技术被认为是一种减少基站间干扰的有效策略。提出了一种用于HetNet场景下基于时延的多基站协作传输方法。首先，利用各协作基站传输信号到用户之间的时延差，据此计算时延补偿因子，在基站端发送信号时进行频域上的相位旋转，实现时延补偿；其次，依据基站间回程时延，选择合适的协作基站，实现基站协作同步，并减少回程时延，降低时延对协作传输的影响。最后，在matlab平台下对该方案进行仿真验证，相比传统方案该方案可降低干扰，提升边缘用户吞吐量和系统整体的吞吐量。%The coverage performance and capacity of wireless network can be effectively improved with the deployment of small cell.The coordinated multiple point transmission is regarded as an effective strategy to reduce the interference between small cells.This paper presents a coordinated multiple base stations transmission scheme based on latency in heterogeneous network.Firstly,according to different delays from cooperative base stations to users,the delay compensation of each user is realized by phase rotation of transmitted signals at the base station side in frequency domain.Secondly,according to the backhaul latency between base stations,the appropriate cooperative base station is selected and the synchronous collaboration is achieved. The backhaul latency is reduced and the affect of latency on cooperative transmission is reduced.Finally,the simulation is performed for this scheme under matlab,the results show that this scheme can reduce the interference and improve the throughput of edge users and the overall throughput of system,compared with the traditional scheme.