LTE家庭基站下行资源分配与干扰管理研究

发布时间：2018-03-05 17:02

本文选题：家庭基站　切入点：干扰管理　出处：《西安电子科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：无线通信发展到今天,已经无处不在的改变着人类的日常生活。目前,LTE网络已经在世界范围内得到大规模的部署。虽然LTE网络在室外具有数据速率高、覆盖范围广的优势,但是在室内,由于衰落的原因,其覆盖效果并不理想。家庭基站是解决宏蜂窝网络在室内覆盖效果不佳的一种微基站,它通过宽带与移动核心网相连,可以使用与宏基站相同的频段,这样,用户进入室内后可以继续连接到网络而不用进行模式切换技术。在引入家庭基站后,由于是异构网络,因此带来了新的问题和挑战,其中最重要的挑战之一便是家庭基站在异构网络下的干扰管理。在异构网络中,家庭基站不仅要解决由于与宏基站使用相同资源块所带来的跨层干扰问题,还需要解决家庭基站间的同层干扰问题。本文首先介绍了异构网络下的干扰管理背景,然后对干扰场景及资源块部署场景进行了分析及说明,并重点从两个方面研究了LTE网络下家庭基站的干扰管理技术。1)通过将家庭基站的不同资源块需求个数加入到模型中并将非线性优化模型转化为线性优化模型,研究了一种基于家庭基站带宽需求的下行干扰管理算法。首先根据宏用户的信干噪比门限值确定每个家庭基站的可用资源块集合,从而实现对跨层干扰进行管理的目的;之后,以最大化家庭基站的资源块有效利用率为目标,建立优化问题模型,然后将非线性优化模型转换为线性优化模型进行初始分配,再根据初始分配结果执行一次资源块再分配。仿真结果表明,本文算法能够在使用更少的资源块下,更好的满足家庭基站的资源块需求,提高资源块的有效利用率。2)通过集中式的功率分配和分布式的功率调整两个阶段,研究了一种分阶段的家庭基站下行功率控制方法。首先对每个家庭基站进行分布式功率控制,目的是在满足最大发射功率限制的条件下最大化每个家庭基站的吞吐量;而后,依据宏用户的SINR要求来相应的调整家庭基站的发射功率;最后,利用约束条件构建的指标函数来进行贪婪式的功率调整,提高家庭基站接入的有效资源块比例。仿真结果表明,本文的方法能够提升家庭基站的有效接入资源块比例,同时能够在对宏用户保护的基础上提高整个系统的吞吐量。
[Abstract]:Today, wireless communication has changed the daily life of human beings everywhere. At present, the LTE network has been deployed on a large scale around the world. Although LTE network has the advantages of high data rate and wide coverage outside, But in the indoor, because of the decline, the coverage effect is not ideal. The home base station is a kind of micro-base station which solves the problem of the poor indoor coverage of the macrocellular network. It is connected with the mobile core network through the broadband. It is possible to use the same frequency band as the Acer station, so that the user can continue to connect to the network without mode switching after entering the room. After the introduction of the home base station, the heterogeneous network brings new problems and challenges. One of the most important challenges is the interference management of home base stations in heterogeneous networks. In heterogeneous networks, home base stations not only address the cross-layer interference caused by the use of the same resource blocks as Acer stations. In this paper, the background of interference management in heterogeneous network is introduced, and then the interference scene and resource block deployment scenario are analyzed and explained. The interference management technology of the home base station in LTE network is studied from two aspects. (1) by adding the number of different resource blocks of the cell base station into the model, the nonlinear optimization model is transformed into the linear optimization model. In this paper, a downlink interference management algorithm based on the bandwidth requirement of the home base station is studied. Firstly, the set of available resource blocks of each home base station is determined according to the threshold value of the signal-to-noise ratio of the macro user, so as to achieve the purpose of managing the cross-layer interference. In order to maximize the effective utilization of the resource block of the cell base station, the optimization problem model is established, and then the nonlinear optimization model is transformed into the linear optimization model for initial allocation. The simulation results show that the proposed algorithm can better meet the resource block requirements of the home base station under the condition of using fewer resource blocks. By means of centralized power allocation and distributed power adjustment, a phased downlink power control method for home base stations is studied. Firstly, distributed power control is applied to each family base station. The purpose is to maximize the throughput of each cell base station under the condition of maximum transmission power limit; then adjust the transmission power of the home base station according to the SINR requirements of the macro user. The index function constructed by the constraint condition is used to adjust the greedy power to increase the proportion of the effective resource block of the home base station access. The simulation results show that the method in this paper can increase the proportion of the effective access resource block of the home base station. At the same time, the throughput of the whole system can be improved on the basis of macro-user protection.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5

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