基于时域改进的异构网络干扰管理研究

发布时间：2019-01-06 07:30

【摘要】：近年来,由于移动互联网的迅猛发展以及城镇人口数量的快速增长,人们对通信业务的需求量与日俱增,这也就导致了在地域上通信热区、通信盲区会出现越来越多。正因为这样,传统的宏基站“补盲、补热”的方式,不仅对运营商造成了巨大的成本压力,也会造成现有的基站之间出现十分强烈的干扰。在LTE-A系统中,引入低功率节点组成异构网络,改变了传统的网络拓扑结构,能够有效改善系统的吞吐量情况。但是,随着低功率节点部署量的增加,异构网络中会出现严重的同层和跨层干扰。在本文中,重点研究Macro-Pico情境下的异构网络干扰问题。Pico基站的作用是为了“补盲、补热”,其中“补热”的Pico因为受到来自Macro的强烈干扰导致非常少的用户接入量,这样不能达到的“补热”的目的。应用CRE技术可以使得更多的用户接入到Pico,然而,对于那些处在了Pico扩展区域内的用户来说,它会受到来自Macro基站严重的干扰,信道质量会变得很差,同时吞吐量也会下降。基于异构网络存在的这类干扰问题,本文重点研究了基于LP-ABS的e ICIC技术,提出一种自适应配置的LP-ABS方案和一种Co MP与LP-ABS结合的干扰协调方案。在论文的开篇,介绍了LTE-A异构网络中的一些重点技术,分析了LTE-A异构网络存在的干扰问题,干扰场景。然后,对CRE技术和e ICIC技术进行了简要分析,搭建了异构网络仿真平台。在论文的第三章,介绍了时域e ICIC中的LP-ABS技术,仿真分析了不应用e ICIC与应用LP-ABS与CRE结合的技术下,用户吞吐量的情况。提出了一种自适应的LP-ABS技术,仿真分析了固定配置和自适应的LP-ABS技术对系统性能的影响。在异构网络中只采用LP-ABS技术,还是会存在一些干扰问题亟待解决。所以,在论文中提出一种Co MP和LP-ABS结合的干扰协调方案。该方案根据用户受干扰程度,将Macro基站进行区域划分,根据中心区域的用户Io T值对用户进行功率分配,并应用Co MP技术进行协作传输,对处于边缘区域的用户应用自适应LP-ABS技术。仿真对比不采用任何干扰协调技术,只采用自适应LP-ABS技术以及Co MP和LP-ABS结合方案下系统的性能情况。通过仿真结果看到结合方案在不影响宏基站中心用户性能的情况下,提高了宏基站边缘用户、Pico基站用户以及小区吞吐量。
[Abstract]:In recent years, with the rapid development of mobile Internet and the rapid growth of urban population, the demand for communication services is increasing day by day, which leads to more and more communication hot areas in the region, communication blind areas will appear more and more. Because of this, the traditional method of "blind compensation, heating compensation" not only causes huge cost pressure to operators, but also causes very strong interference between existing base stations. In LTE-A systems, the introduction of low power nodes to form heterogeneous networks changes the traditional network topology, and can effectively improve the throughput of the system. However, with the increase of low power node deployment, there will be serious peer and cross-layer interference in heterogeneous networks. In this paper, we focus on the problem of heterogeneous network interference in Macro-Pico. The function of Pico base station is to "compensate for blindness and heat", in which the "heating" Pico is subjected to strong interference from Macro, resulting in very little access to users. This cannot achieve the goal of "replenishing heat". The application of CRE technology can make more users access to the Pico,. However, for those in the Pico extension area, it will be seriously interfered from the Macro base station, the channel quality will become poor, and the throughput will decline. Based on this kind of interference problem in heterogeneous networks, this paper focuses on the e ICIC technology based on LP-ABS, and proposes an adaptive LP-ABS scheme and an interference coordination scheme combining Co MP and LP-ABS. At the beginning of this paper, some key technologies in LTE-A heterogeneous network are introduced, and the interference problems and interference scenes in LTE-A heterogeneous network are analyzed. Then, the CRE technology and e ICIC technology are briefly analyzed, and the heterogeneous network simulation platform is built. In the third chapter, the LP-ABS technology in time domain e ICIC is introduced, and the user throughput is simulated and analyzed under the combination of e ICIC and LP-ABS and CRE. An adaptive LP-ABS technique is proposed. The effects of fixed configuration and adaptive LP-ABS technology on the system performance are simulated and analyzed. Only using LP-ABS technology in heterogeneous networks, there are still some interference problems to be solved. Therefore, a new interference coordination scheme combining Co MP and LP-ABS is proposed in this paper. According to the interference degree of the user, the Macro base station is divided into regions, the power is allocated according to the Io T value of the central area, and the cooperative transmission is carried out by using the Co MP technology. Adaptive LP-ABS technology is applied to users in edge area. The simulation results show that no interference coordination technique is used, only adaptive LP-ABS technology and the performance of the system under the combination of Co MP and LP-ABS are adopted. The simulation results show that the proposed scheme can improve the throughput of Acer station edge users, Pico base station users and cell throughput without affecting the performance of Acer station central users.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.5

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