FDD-LTE下行动态ICIC的研究与实现

发布时间：2018-07-26 17:11

【摘要】：随着人们对于移动业务需求的增加,提供越来越快的移动通信速率成为了电信运营商的首要目标,而3G移动通信已经不能满足日益增长的移动通信业务需求。为了应对这种局面,LTE成为了电信运营商的不二选择,它给未来4G演进指明了方向。LTE系统采用了OFDM技术,下行数据在多个载波上同时传输,可以有效的抑制码间干扰,也就是能够有效解决小区内的干扰问题。但是同频组网是LTE系统提升频谱效率的关键,从而使得LTE系统面临更严重的小区间干扰问题。本文在此背景下研究LTE系统中的ICIC技术,并分析下行干扰的多种场景,提出一种下行动态ICIC方案,通过仿真和实验来验证方案的可行性。本文在讨论LTE系统中ICIC技术的必要性的基础上,探讨了ICIC技术的关键问题,包括对下行干扰场景的分析；明确了小区ICIC模式、邻区列表和信息交互机制,并通过对比分析选取了一种边缘频带协调方案；随后介绍了LTE协议栈不同层需要完成的功能设计。通过性能仿真研究来验证该方案的可行性,并初步确定该方案的性能效果；随后通过实验测试,表明加入ICIC功能的LTE系统能够为小区边缘用户提供稳定的移动通信服务,有效抑制小区问的干扰。
[Abstract]:With the increasing demand for mobile services, providing faster and faster mobile communication rate has become the primary target of telecom operators, but 3G mobile communication can no longer meet the increasing demand for mobile communication services. In order to deal with this situation, LTE has become a good choice for telecom operators. It shows the direction of 4G evolution in the future. LTE system adopts OFDM technology, and the downlink data is transmitted simultaneously on multiple carriers, which can effectively suppress inter-symbol interference (ISI). That is, it can effectively solve the interference problem in the cell. However, the co-frequency network is the key to improve the spectral efficiency of LTE system, which makes the LTE system face more serious inter-cell interference problem. In this paper, the ICIC technology in LTE system is studied, and several scenarios of downlink interference are analyzed, and a downlink dynamic ICIC scheme is proposed. The feasibility of the scheme is verified by simulation and experiment. On the basis of discussing the necessity of ICIC technology in LTE system, this paper discusses the key problems of ICIC technology, including the analysis of downlink jamming scene, the definition of cell ICIC mode, neighborhood list and information exchange mechanism. By comparing and analyzing, we select an edge band coordination scheme, and then introduce the functional design of different layers of LTE protocol stack. The feasibility of the scheme is verified by performance simulation, and the performance effect of the scheme is preliminarily determined. The experimental results show that the LTE system with ICIC function can provide stable mobile communication service for the users at the edge of the cell. Effective suppression of cell interference.
【学位授予单位】：武汉邮电科学研究院
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5

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