基于资源分配的LTE家庭基站干扰管理研究

发布时间：2018-08-25 13:18

【摘要】：近年来随着移动通信网络的蓬勃发展,以及手持智能终端的数量迅猛增长,移动用户对于网络的传输速率的要求也越来越高。家庭基站是一种部署在室内的无线接入点,能够拉近基站与室内用户的传输距离,有效地弥补传统宏基站对于室内区域覆盖的不足,提高系统吞吐量,为室内用户提供高质量的语音和数据业务服务,因而具备良好的发展前景。在原有的宏蜂窝网络下部署家庭基站,将会改变传统的网络拓扑,形成一个两层的异构网络。这将带来家庭基站与宏基站之间的跨层干扰以及家庭基站彼此之间的同层干扰问题。本文重点研究长期演进(Long Time Evolution, LTE)背景下的异构网络中的干扰管理问题。本文首先阐述了LTE和家庭基站的关键技术,分析了部署家庭基站后的LTE异构网络中的干扰场景,介绍了几种现有的家庭基站干扰管理技术并分析了其优缺点,然后针对不同的干扰场景,研究了两种不同的资源分配方案。针对家庭基站与宏基站同频组网的下行链路跨层干扰,本文研究了一个分布式的家庭基站子信道和发射功率联合分配方案。家庭基站进行资源分配时,要保证其对宏基站的用户的干扰小于一个可以接受的门限值。我们的分配方案利用非支配排序遗传算法-2(Nondominated Sorting Genetic Algorithm-2, NSGA-2),不仅能够最大化用户的吞吐量,同时也能够增加家庭基站的功率效率。仿真说明,我们的算法能够提升家庭基站的吞吐量并有效地保护了宏基站用户。针对家庭基站密集部署情况下的同层干扰问题,本文研究了一种基于簇的子信道分配方案。该方案根据家庭基站的干扰关系建立加权无向干扰图,通过分簇将相互间干扰较大的家庭基站分入同一簇中,簇头负责为本簇中的家庭基站分配子信道,并利用基于参考用户的功率控制方法将簇之间的干扰限制在一个预先设定的阂值之下。仿真结果表明在家庭基站密集部署时,通过分簇能够提升系统的吞吐量,并获得更高的用户满意度。
[Abstract]:In recent years, with the rapid development of mobile communication networks and the rapid growth of the number of hand-held intelligent terminals, mobile users are increasingly demanding the transmission rate of the network. The home base station is a kind of wireless access point deployed indoors, which can shorten the transmission distance between the base station and the indoor user, effectively make up for the deficiency of the traditional macro base station to the indoor area coverage, and improve the system throughput. Provide high-quality voice and data service for indoor users, so it has a good development prospects. Deploying the home base station in the original macrocellular network will change the traditional network topology and form a two-layer heterogeneous network. This will lead to cross-layer interference between home base station and Acer station and the same layer interference between home base station. This paper focuses on the problem of interference management in heterogeneous networks under the background of long-term evolution of (Long Time Evolution, LTE). This paper first describes the key technologies of LTE and home base stations, analyzes the interference scenarios in LTE heterogeneous networks after the deployment of home base stations, introduces several existing interference management technologies of home base stations, and analyzes their advantages and disadvantages. Then, two different resource allocation schemes are studied for different interference scenarios. Aiming at the downlink cross-layer interference between the home base station and the macro base station in the same frequency network, a distributed sub-channel and transmit power joint allocation scheme of the home base station is studied in this paper. When a cell base station allocates resources, it should ensure that the interference to the user of the base station is less than an acceptable threshold. Our allocation scheme not only maximizes the throughput of users, but also increases the power efficiency of the cell base stations by using the non-dominated sorting genetic algorithm (-2 (Nondominated Sorting Genetic Algorithm-2, NSGA-2). Simulation results show that our algorithm can improve the throughput of the home base station and protect the users of the base station effectively. In this paper, a cluster based subchannel allocation scheme is proposed to solve the same layer interference problem in the case of dense deployment of home base stations. According to the interference relation of the family base station, the scheme establishes the weighted undirected interference graph. The family base station with greater interference is divided into the same cluster by clustering. The cluster head is responsible for assigning subchannels to the home base station in the cluster. The power control method based on reference user is used to limit the interference between clusters to a predetermined threshold. The simulation results show that the system throughput can be improved and the user satisfaction can be obtained by clustering when the home base station is deployed intensively.
【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

【相似文献】