【摘要】 在通用移动通信系统(Universal Mobile Telecommunications System,UMTS)异构网络中,理论分析了宏基站对微微(Pico)小区边缘用户的下行干扰问题。在传统空白帧(ABS)方法的基础上,提出了一种干扰避免策略,其主要思想是通过联合时域ABS策略和空域基于码本限制的策略提高传统ABS策略的系统性能,即在ABS子帧上,宏基站并不是完全不发送数据,而是采用码本受限的预编码进行传输。限制的码本可以根据宏小区自身的负载动态进行更改,并通过广播传递给低功率节点(Low Power Node,LPN),LPN根据得到的信息进行边缘用户的调度。仿真结果表明,提出的方法在最差5%用户吞吐率比ABS方法略有下降的情况下,使用户平均吞吐量得到了提升。更多还原

【Abstract】 In Universal Mobile Telecommunications System(UMTS) heterogeneous networks,the downlink interference of Pico users from Macro base station is analyzed theoretically and an interference coordination strategy is proposed.The proposed strategy aims to improve the average throughput of traditional ABS by combining the time-domain ABS strategy and spacial pro-coding scheme based on limited codebook set.That is,during the ABSs,Macro BS sends data based on pro-coding with limited codebook set instead of sending nothing at all.The limited codebook set can be transmitted to LPN(Low Power Node) via broadcast,and changed dynamically according to the load changes of Macro cell itself.LPN can schedule bordered users according to the received information.Simulation results show that,compared with the traditional ABS strategy,the proposed method can improve the average throughput at the cost of slight loss of throughput by 5%.更多还原