Small Cell网络及其增强型技术的随机几何分析
发布时间：2019-02-09 06:54
【摘要】：近几年来,small cell网络技术作为一种新型的移动通信组网技术,被认为是一种解决当前移动数据流量爆炸式增长的手段之一,也是移动通信技术演进及下一代移动通信网络的关键技术之一。Small cell网络因其基站具有较小的覆盖范围,使得网络中的发射机能够以较小的发射功率来达到一个较好的通信质量,在减小能耗的同时还能够尽可能的通过空分复用的方式来提高无线频谱效率。 然后,由于small cell基站的密度会远大于传统的宏蜂窝基站,在这样一个密集的网络里面,如何协调这些基站间的干扰是一个不可避免的问题,这也是3GPP组织对small cell组网技术在LTE网络中标准化工作的重心。本文在移动通信网络的随机几何模型的基础上,对small cell网络进行数学建模,重点关注网络的覆盖概率,吞吐量和无线资源利用率,对small cell网络建立起了一个数学模型。对该数学模型进行研究与分析,能够以一个可解析的数学表达式的形式给出small cell网络的性能参数。 通过这个基于随机几何的数学模型,很容易就能得到small cell网络上行和下行的覆盖概率。在此基础上,提出了一种基于网络中频率隔离的干扰协调技术来对small cell网络进行优化的方法。 在本文中,特别关注了采用TDD-LTE制式的small cell网络。由于small cell网络中的用户与业务具有特别大的不确定性,从而导致移动数据流量具有相当大的动态性,因此特别适用采用dynamic TDD的以提高small cell网络的性能。通过本文所使用的随机几何模型可以得出dynamic TDD网络下的上行与下行覆盖概率,同时发现dynamic TDD网络中的上行传输通信质量受到了来自于视距下行small cell基站的严重干扰。为了解决这种dynamic TDD网络中的串行干扰,本文中研究了一种基于发送空白帧的干扰协调技术。在数值结果中发现,尽管这种干扰协调技术能够提高dynamic TDD网络中的上行通信质量,但这是以牺牲网络中下行无线资源为代价的。因此本文也对该协调技术中的参数做了一定的分析与优化,以达到上行链路通信质量与无线资源利用率的均衡。
[Abstract]:In recent years, as a new type of mobile communication networking technology, small cell network technology is considered as one of the methods to solve the explosive growth of mobile data traffic. . Small cell network is also one of the key technologies of mobile communication technology evolution and the next generation mobile communication network because of its base station has a relatively small coverage, The transmitter in the network can achieve a better communication quality with lower transmission power, and can improve the wireless spectrum efficiency by using space division multiplexing as much as possible while reducing the energy consumption. Then, because the density of small cell base station will be much higher than that of traditional macrocellular base station, in such a dense network, how to coordinate the interference between these base stations is an inevitable problem. This is also the focus of 3GPP's standardization of small cell networking technology in LTE networks. Based on the random geometric model of mobile communication network, this paper builds a mathematical model for small cell network, focusing on the coverage probability, throughput and radio resource utilization of small cell network. The mathematical model is studied and analyzed, and the performance parameters of small cell network can be given in the form of an analytic mathematical expression. By using this mathematical model based on random geometry, we can easily obtain the coverage probability of small cell network in uplink and downlink. Based on this, a method of interference coordination based on frequency isolation in the network is proposed to optimize the small cell network. In this paper, we pay special attention to the small cell network based on TDD-LTE. Due to the uncertainty of users and services in small cell networks, mobile data traffic is very dynamic, so it is especially suitable to use dynamic TDD to improve the performance of small cell networks. The probabilities of uplink and downlink coverage in dynamic TDD networks can be obtained by using the random geometric model used in this paper. At the same time, it is found that the uplink transmission quality in dynamic TDD networks is seriously disturbed by the small cell base stations in the line-of-sight and downlink networks. In order to solve the serial interference in the dynamic TDD network, a interference coordination technique based on transmitting blank frames is studied in this paper. Numerical results show that although this interference coordination technique can improve the quality of uplink communication in dynamic TDD networks, it is at the expense of the downlink wireless resources in the network. So this paper also analyzes and optimizes the parameters of the coordination technology to achieve the balance between the uplink communication quality and the utilization of wireless resources.
【学位授予单位】：北京邮电大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN929.5
本文编号：2418813
[Abstract]:In recent years, as a new type of mobile communication networking technology, small cell network technology is considered as one of the methods to solve the explosive growth of mobile data traffic. . Small cell network is also one of the key technologies of mobile communication technology evolution and the next generation mobile communication network because of its base station has a relatively small coverage, The transmitter in the network can achieve a better communication quality with lower transmission power, and can improve the wireless spectrum efficiency by using space division multiplexing as much as possible while reducing the energy consumption. Then, because the density of small cell base station will be much higher than that of traditional macrocellular base station, in such a dense network, how to coordinate the interference between these base stations is an inevitable problem. This is also the focus of 3GPP's standardization of small cell networking technology in LTE networks. Based on the random geometric model of mobile communication network, this paper builds a mathematical model for small cell network, focusing on the coverage probability, throughput and radio resource utilization of small cell network. The mathematical model is studied and analyzed, and the performance parameters of small cell network can be given in the form of an analytic mathematical expression. By using this mathematical model based on random geometry, we can easily obtain the coverage probability of small cell network in uplink and downlink. Based on this, a method of interference coordination based on frequency isolation in the network is proposed to optimize the small cell network. In this paper, we pay special attention to the small cell network based on TDD-LTE. Due to the uncertainty of users and services in small cell networks, mobile data traffic is very dynamic, so it is especially suitable to use dynamic TDD to improve the performance of small cell networks. The probabilities of uplink and downlink coverage in dynamic TDD networks can be obtained by using the random geometric model used in this paper. At the same time, it is found that the uplink transmission quality in dynamic TDD networks is seriously disturbed by the small cell base stations in the line-of-sight and downlink networks. In order to solve the serial interference in the dynamic TDD network, a interference coordination technique based on transmitting blank frames is studied in this paper. Numerical results show that although this interference coordination technique can improve the quality of uplink communication in dynamic TDD networks, it is at the expense of the downlink wireless resources in the network. So this paper also analyzes and optimizes the parameters of the coordination technology to achieve the balance between the uplink communication quality and the utilization of wireless resources.
【学位授予单位】：北京邮电大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN929.5
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