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LTE-A异构网络小区间干扰协调技术研究

发布时间:2018-01-11 10:15

  本文关键词:LTE-A异构网络小区间干扰协调技术研究 出处:《西安电子科技大学》2014年硕士论文 论文类型:学位论文


  更多相关文章: LTE-A 异构网络 增强型小区间干扰协调 ABS CoMP


【摘要】:近十几年来,蜂窝移动通信技术迅猛发展。为了满足人们对于移动通信的日益增长且多样的需求,同构网络的基础上,发展出了异构网络。在3GPP LTE-A相关标准的制定过程中,异构网络技术也被放在了一个重要位置上。由于LTE-A异构网络改变了原有的网络拓扑结构,如何处理异构网络中的小区间干扰成为了重要研究课题。在LTE-A异构网络小区间干扰协调技术中,功率控制和时域的干扰协调技术最受重视。小区范围拓展(CRE)技术和几乎空白子帧技术(ABS)都成为了LTE-A异构网络小区间干扰协调的关键技术。CRE技术可以打破Macro小区和Pico小区由于用户接入能力不同所导致的负载不平衡。ABS技术则通过让Macro基站在某些子帧上不发送数据信号,减少Macro基站对Pico基站CRE区域用户受到的小区间干扰,从而提升Pico小区吞吐量。本文详细介绍了LTE-A中的异构网络,并且介绍了包括频域、功率控制、时域这三种主要的异构网络小区间干扰协调技术。本文主要研究了时域增强型小区间干扰协调方法。对LTE-A异构网络进行了仿真模型的建立,并对ABS技术进行了仿真分析。详细介绍了LTE-A异构网络时域eICIC中的CRE技术。着重研究了在ABS上进行改进提出的LP-ABS,通过系统仿真,研究了LP-ABS相比传统ABS带来的各种影响和对系统性能的增益。分析了不同的CRE条件下,不同功率衰减值对LP-ABS方案性能的影响。并且,还分析了LP-ABS技术在不同功率衰减值下,对Macro层和Pico层的不同作用和影响。根据对仿真数据分析,总结出使用LP-ABS方案时,各种参数的设置方法。对ABS技术和CoMP技术的结合进行了研究。提出了一种自适应的ABS-CoMP方案,通过每次比较ABS和CoMP波束赋形的系统容量,自适应地选择出容量更大的方案,从而提升整个系统的增益。并对自适应ABS-CoMP方案进行了系统建模与仿真,分析了ABS-CoMP方案相比传统方案和单纯ABS方案带来的增益和存在的不足,分别分析了ABS-CoMP方案对Macro小区用户,Pico边缘用户和Pico中心用户的带来的影响。
[Abstract]:In recent years, cellular mobile communication technology has developed rapidly. In order to meet the increasing and diverse needs of mobile communication, the isomorphic network is based on. The development of heterogeneous networks. 3GPP LTE-A standards in the formulation process. Heterogeneous network technology has also been placed in an important position because of the LTE-A heterogeneous network has changed the original network topology. How to deal with inter-cell interference in heterogeneous networks has become an important research topic. In LTE-A heterogeneous network inter-cell interference coordination technology. Most attention is paid to power control and interference coordination in time domain. Cell area expansion (CRE) technique and almost blank subframe technique (ABS). CRE technology can break the load imbalance of Macro cell and Pico cell due to the difference of user access ability. BS technology by having the Macro base station do not send data signals on certain subframes. Reduce the Macro base station to Pico base station CRE area users suffered by the inter-cell interference, thereby improving the Pico cell throughput. This paper introduces the heterogeneous network in LTE-A in detail. It also introduces frequency domain and power control. In this paper, the time-domain enhanced inter-cell interference coordination method is studied, and the simulation model of LTE-A heterogeneous network is established. The ABS technology is simulated and analyzed. The CRE technology in the time domain eICIC of LTE-A isomerous network is introduced in detail. The LP-ABS which is improved on ABS is studied emphatically. Through the system simulation, the effects of LP-ABS on the performance of the system compared with the traditional ABS are studied, and the performance gains of the system are analyzed under different CRE conditions. The influence of different power attenuation values on the performance of LP-ABS scheme is also analyzed. Furthermore, the LP-ABS technology under different power attenuation values is also analyzed. According to the analysis of simulation data, the paper summarizes the use of LP-ABS scheme. The combination of ABS technology and CoMP technology is studied, and an adaptive ABS-CoMP scheme is proposed. By comparing the system capacity of ABS and CoMP beamforming each time, the scheme with larger capacity is selected adaptively. In order to improve the gain of the whole system, the adaptive ABS-CoMP scheme is modeled and simulated. Compared with the traditional scheme and the simple ABS scheme, the gain and the shortcomings of the ABS-CoMP scheme are analyzed, and the ABS-CoMP scheme to the Macro cell users is analyzed respectively. The impact of Pico Edge users and Pico Center users.
【学位授予单位】:西安电子科技大学
【学位级别】:硕士
【学位授予年份】:2014
【分类号】:TN929.5;TN972

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