TD-LTE网络室内部署技术的研究

发布时间：2018-09-05 12:20

【摘要】：TD-LTE是一种专门为移动高宽带应用而设计、具有核心自主知识产权的TDD模式的LTE标准,具有有效利用零散频谱,灵活支持非对称业务等优势。随着数据业务特别是室内数据业务的快速增长,传统的宏蜂窝小区难以满足室内用户的业务需求。室内部署技术通过在室内部署小功率节点(包括Femto和DAS),与原有网络构成异构网络,解决室内网络的覆盖和容量问题。而如何在复杂网络环境部署并评估室内技术,则是亟待解决的问题,也是本文的研究内容。首先,对实际城区室内场景进行了三维建模。以往室内部署技术的研究基于二维规则网络模型,无法正确建模高度对网络性能的影响。三维建模考虑高度对地图、用户分布、传播损耗、天线增益等各方面的影响,还原网络的真实特性。其次,研究了TD-LTE网络室内部署技术下行容量和室内部署算法。理论推导了Femto和DAS两种室内部署技术的下行容量；针对室内小功率节点部署数量大,计算复杂度高特点,设计了基于用户分布(算法1)和基于中断用户分布(算法2)的两种快速部署算法。两种算法分别以一定区域内用户分布数量和中断用户分布数量为优先级部署基站,目标是降低整个网络的中断率。最后,利用室内部署算法设计了多种室内部署方案,并对部署方案以及部署算法进行了大量的仿真。结果表明,在以网络中断率为关键性能指标的网络演进中,室内部署技术相对室外部署技术、DAS部署技术相对Femto部署技术、三种异构网络部署技术相对两种异构网络部署技术能更有效的提高网络性能；两种部署算法均能在保证降低中断率前提下有效的提高网络覆盖和容量特性,其中算法1比算法2能更有效的提高网络吞吐量,算法2比算法1能更有效的降低网络中断率。
[Abstract]:TD-LTE is a TDD standard specially designed for mobile high broadband applications with core independent intellectual property rights. It has the advantages of efficient use of scattered spectrum and flexible support of asymmetric services. With the rapid growth of data services, especially indoor data services, it is difficult for traditional macrocellular areas to meet the needs of indoor users. Indoor deployment technology solves the problem of indoor network coverage and capacity by deploying small power nodes (including Femto and DAS),) into heterogeneous networks. How to deploy and evaluate indoor technology in complex network environment is an urgent problem, and is also the research content of this paper. Firstly, three-dimensional modeling of indoor scene in actual urban area is carried out. Previous researches on indoor deployment technology were based on two-dimensional regular network model, which could not correctly model the influence of height on network performance. The 3D modeling takes into account the influence of height on map, user distribution, propagation loss, antenna gain and so on, so as to restore the real characteristics of the network. Secondly, the downlink capacity and indoor deployment algorithm of TD-LTE network indoor deployment technology are studied. The downlink capacity of two indoor deployment technologies, Femto and DAS, is derived theoretically. Two fast deployment algorithms based on user distribution (algorithm 1) and interrupt user distribution (algorithm 2) are designed. The two algorithms take the number of users distribution and the number of interrupt users as priority to deploy the base station respectively. The goal of the two algorithms is to reduce the outage rate of the whole network. Finally, various indoor deployment schemes are designed by using indoor deployment algorithms, and a large number of simulations are carried out on deployment schemes and deployment algorithms. The results show that in the evolution of the network with network outage rate as the key performance index, the indoor deployment technology is relative to the outdoor deployment technology, and the Das deployment technology is relative to the Femto deployment technology. Three kinds of heterogeneous network deployment techniques can improve network performance more effectively than two heterogeneous network deployment technologies, and both deployment algorithms can effectively improve network coverage and capacity characteristics under the premise of reducing interrupt rate. Algorithm 1 can improve network throughput more effectively than algorithm 2, and algorithm 2 can reduce network outage rate more effectively than algorithm 1.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TN929.5

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