LTE-A异构网络中干扰抑制技术的研究

发布时间：2018-06-28 18:46

本文选题：LTE-A + 异构节点　；参考：《天津大学》2014年硕士论文

【摘要】：为满足未来无线通信市场的更高需求,LTE-A系统应运而生。为进一步提高系统容量,异构网络成为LTE-A的一个新特性。比如,通过在原来宏网络中部署微蜂窝(micro)、微微蜂窝(pico)、毫微微蜂窝(femto)、中继(relay)等低功率节点来改善室内深度覆盖、增加网络容量、提升用户感知。但是这些异构节点的引入将不可避免的带来新的干扰问题,这将会严重影响LTE-A异构网络的整体性能。因此,如何抑制新引入节点与宏基站间的干扰问题已成为业内人士关注的焦点,合理抑制异构网络中的干扰对下一代移动通信系统的发展具有重要意义。本文详细介绍了LTE-A关键技术、LTE-A异构网络发展历程、干扰场景以及干扰抑制相关知识。针对LTE-A异构网络,本文重点研究了relay系统和femto系统的干扰协调方案,包括方案的选取及改进。论文主要工作和成果包括以下两方面:第一,针对LTE-A relay系统,本文主要研究系统中存在的上行干扰。文中从小区内和小区间上行干扰两方面入手,提出了一种联合频域协调和功率控制的干扰协调方案。与传统干扰协调方案相比,该方案在考虑提高整个网络的吞吐量和小区边缘用户速率的前提下,还考虑了提升用户的满意度;并首次将频域协调和功率控制方法相结合,通过基于OI和RSRP的用户类型判定、基于HII的动态频谱分配方法以及基于RSRP修正的功率控制方法,从而达到减小LTE-A relay系统的上行干扰的效果。第二,对于LTE-A femto系统,本文主要是对系统中存在的下行干扰进行研究。通过分析研究现有的用于LTE-Afemto系统干扰抑制方案的优势和不足,提出了基于SFR的小区间干扰协调方案,并对新旧方案分别进行了仿真验证。仿真结果表明,该方案减小了系统中femto节点对宏用户的干扰,以及eNodeB和附近其他femto节点对femto用户的干扰,提高了整个系统的吞吐量和小区边缘用户的平均吞吐量。
[Abstract]:LTE-A system emerges as the times require to meet the higher demand of future wireless communication market. In order to further improve the system capacity, heterogeneous networks become a new feature of LTE-A. For example low power nodes such as microcellular (micro), pico cellular (pico), femtosecellular (femto), relay (relay) are deployed in the original macro network to improve indoor depth coverage increase network capacity and enhance user perception. However, the introduction of these heterogeneous nodes will inevitably bring about new interference problems, which will seriously affect the overall performance of LTE-A heterogeneous networks. Therefore, how to suppress the interference between the newly introduced nodes and the Acer stations has become the focus of attention of the industry. It is of great significance for the development of the next generation mobile communication system to reasonably suppress the interference in heterogeneous networks. In this paper, the key technology of LTE-A is introduced in detail, including the development of LTE-A heterogeneous networks, interference scenarios and interference suppression knowledge. For LTE-A heterogeneous networks, this paper focuses on the interference coordination scheme of relay system and femto system, including the selection and improvement of the scheme. The main work and achievements are as follows: firstly, for LTE-A relay system, the uplink interference in LTE-A relay system is studied in this paper. In this paper, an interference coordination scheme of joint frequency domain coordination and power control is proposed from two aspects of intra-cell and inter-cell uplink interference. Compared with the traditional interference coordination scheme, the scheme not only takes into account the improvement of the throughput of the whole network and the cell edge user rate, but also considers the improvement of user satisfaction, and combines frequency domain coordination and power control methods for the first time. The Uplink interference of LTE-A relay system can be reduced by judging the user type based on Oi and RSRP, the dynamic spectrum allocation method based on HII and the power control method based on RSRP correction. Secondly, for LTE-A femto system, the downlink interference in the system is studied in this paper. By analyzing the advantages and disadvantages of the existing interference suppression schemes for LTE-Afemto systems, a SFR-based inter-cell interference coordination scheme is proposed, and the new and old schemes are verified by simulation. The simulation results show that the scheme reduces the interference of femto nodes to macro users and eNode B and other femto nodes nearby to femto users, and improves the throughput of the whole system and the average throughput of cell edge users.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5

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