LTE系统中的小区间干扰协调方案研究
发布时间：2018-08-16 14:12
【摘要】：随着4G牌照的发放，，LTE系统在我国正在开始大规模商用。由于LTE系统采用的是复用因子为1的同频组网，因此小区间干扰是一个严重的问题。干扰协调方案是目前主流的解决LTE系统的小区间干扰问题的方案，但其存在一定的缺陷。本文在基于对LTE系统关键技术的分析和对现有的干扰协调方案的仿真测试上，提出了一种按距离和SINR综合考虑的用户划归方案，并通过仿真，验证了改进方案的有效性。本文主要完成了以下工作： 对干扰协调技术的两大主流方案——SFR方案和FFR方案进行了详细的分析介绍，并分别指出了他们的技术优点和缺点。 详细地分析介绍了LTE系统的两大底层核心技术——OFDM技术和MIMO技术，这两种技术是LTE系统抗干扰能力的关键所在。本文还对LTE系统的功率控制和分配进行了介绍，指出了它们对于LTE系统抗干扰的关键性。LTE系统技术的介绍对于后面的技术改进具有重要意义。 详细介绍了搭建LTE系统级仿真平台的过程。搭建过程首先是从整体了解通信系统的仿真；然后从基站侧、用户侧、噪声模型和业务模型等方面逐个模块搭建LTE的系统级仿真平台；最后列举了仿真评估的指标，主要包括用户可接入率、小区信噪比分布、系统容量、各调制模式占比等。仿真平台的搭建对于后续方案的改进提供了测试平台，并且对最终的效果验证提供了支持。 在分析了传统方案的不足之后，针对老方案的缺陷提出了一种新方案，并进行仿真对比。首先对干扰协调技术的分类进行了介绍，详细阐述了静态干扰协调，半静态干扰协调和动态干扰协调三种干扰协调方式。然后对传统的干扰协调方案进行仿真测试，在证明干扰协调方案比普通的频率复用方案更有优势的同时，也指出其依然有需要改进的地方。接下来，本文提出了一种基于对小区用户按照SINR和距离的综合考虑进行划归的新方案。最后，利用本文搭建好的LTE系统级仿真平台对改进方案进行仿真验证，并与传统的SFR方案和频率复用方案进行对比，得出改进方案提升了系统的各方面性能的结论。
[Abstract]:With the issuance of 4G license, LTE system is being used on a large scale in our country. Since the LTE system uses a co-frequency network with a multiplexing factor of 1, inter-cell interference is a serious problem. Interference coordination scheme is the mainstream solution to the inter-cell interference problem in LTE systems, but it has some defects. Based on the analysis of the key technology of LTE system and the simulation test of the existing interference coordination scheme, this paper puts forward a user attribution scheme considering the distance and SINR synthetically, and verifies the effectiveness of the improved scheme by simulation. The main work of this paper is as follows: two main schemes of interference coordination technology, SFR scheme and FFR scheme, are analyzed and introduced in detail, and their technical advantages and disadvantages are pointed out respectively. In this paper, two basic core technologies of LTE system, OFDM and MIMO, are analyzed and introduced in detail. These two technologies are the key to the anti-jamming ability of LTE system. This paper also introduces the power control and distribution of LTE system, and points out that their key to LTE system anti-jamming. LTE system technology is of great significance for the later technical improvement. The process of building LTE system-level simulation platform is introduced in detail. The first step is to understand the simulation of the communication system from the whole, then from the base station side, user side, noise model and business model to build a system-level simulation platform of LTE. Finally, the index of simulation evaluation is listed. It mainly includes user access rate, cell SNR distribution, system capacity, modulation mode ratio and so on. The construction of the simulation platform provides a test platform for the subsequent improvement of the scheme and supports the final effect verification. After analyzing the shortcomings of the traditional scheme, a new scheme is proposed for the defects of the old scheme, and the simulation results are compared. Firstly, the classification of interference coordination technology is introduced, and three kinds of interference coordination modes, static interference coordination, semi-static interference coordination and dynamic interference coordination, are described in detail. Then the simulation test of the traditional interference coordination scheme shows that the interference coordination scheme has more advantages than the common frequency multiplexing scheme, but also points out that it still needs to be improved. Then, this paper proposes a new scheme based on the comprehensive consideration of SINR and distance for cell users. Finally, the improved scheme is verified by using the LTE system-level simulation platform, and compared with the traditional SFR scheme and frequency reuse scheme. The conclusion is that the improved scheme improves the performance of the system in all aspects.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5
[Abstract]:With the issuance of 4G license, LTE system is being used on a large scale in our country. Since the LTE system uses a co-frequency network with a multiplexing factor of 1, inter-cell interference is a serious problem. Interference coordination scheme is the mainstream solution to the inter-cell interference problem in LTE systems, but it has some defects. Based on the analysis of the key technology of LTE system and the simulation test of the existing interference coordination scheme, this paper puts forward a user attribution scheme considering the distance and SINR synthetically, and verifies the effectiveness of the improved scheme by simulation. The main work of this paper is as follows: two main schemes of interference coordination technology, SFR scheme and FFR scheme, are analyzed and introduced in detail, and their technical advantages and disadvantages are pointed out respectively. In this paper, two basic core technologies of LTE system, OFDM and MIMO, are analyzed and introduced in detail. These two technologies are the key to the anti-jamming ability of LTE system. This paper also introduces the power control and distribution of LTE system, and points out that their key to LTE system anti-jamming. LTE system technology is of great significance for the later technical improvement. The process of building LTE system-level simulation platform is introduced in detail. The first step is to understand the simulation of the communication system from the whole, then from the base station side, user side, noise model and business model to build a system-level simulation platform of LTE. Finally, the index of simulation evaluation is listed. It mainly includes user access rate, cell SNR distribution, system capacity, modulation mode ratio and so on. The construction of the simulation platform provides a test platform for the subsequent improvement of the scheme and supports the final effect verification. After analyzing the shortcomings of the traditional scheme, a new scheme is proposed for the defects of the old scheme, and the simulation results are compared. Firstly, the classification of interference coordination technology is introduced, and three kinds of interference coordination modes, static interference coordination, semi-static interference coordination and dynamic interference coordination, are described in detail. Then the simulation test of the traditional interference coordination scheme shows that the interference coordination scheme has more advantages than the common frequency multiplexing scheme, but also points out that it still needs to be improved. Then, this paper proposes a new scheme based on the comprehensive consideration of SINR and distance for cell users. Finally, the improved scheme is verified by using the LTE system-level simulation platform, and compared with the traditional SFR scheme and frequency reuse scheme. The conclusion is that the improved scheme improves the performance of the system in all aspects.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5
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