LTE家庭基站的干扰协调算法研究

发布时间：2019-05-18 16:48

【摘要】：随着人们对无线速率要求的的不断提高和数据业务不断发展,LTE商用势在必行。LTE主要关注2.3GHz、2.6GHz相对较高的频段,这种高频段下的电磁波穿透建筑物会受到很大的穿透损耗,导致信号质量大幅度下降,而研究表明,在宏蜂窝小区中,大约2/3的语音业务和超过70%的数据业务发生在室内。因此为了解决室内覆盖问题,引入家庭基站(femtocell)的概念。femtocell的引入给传统蜂窝系统带来了严重的干扰问题,由于家庭基站有着即插即用的特点,不能对家庭基站的部署进行规划和优化,需要新的干扰协调策略。本文介绍了家庭基站的技术优势和面临的挑战,详细分析了引入家庭基站后带来的干扰问题,在对传统的小区间干扰协调策略和现有femtocell干扰协调技术研究的基础上,针对家庭基站严重的同层干扰,改进了家庭基站分组干扰协调算法,首先根据家庭基站获取的邻居列表建立干扰矩阵,然后根据干扰矩阵对家庭基站进行分组,将相互干扰的家庭基站分为一组。在家庭基站分组后,不同组之间可以独立的频率复用。同组家庭基站在正交分配频率资源的基础上,充分考虑家庭基站负载差异和用户的信道差异,进行频率资源的动态分配。针对算法一中频谱资源利用率低的问题,改进了频谱感知的干扰协调算法,在家庭基站分组的基础上,利用协作频谱感知技术检测未被宏蜂窝用户占用的频带资源,按照干扰度和负载大小的顺序进行空闲频率资源的占用,在避免家庭基站和宏蜂窝用户之间相互干扰的基础上,进一步提高了频谱利用率。通过对所提两种算法的仿真,分析了算法一在不同干扰门限下家庭基站分组规模的大小以及对频率资源分配的影响,在合适的干扰门限下,可以看出算法一实现了不同分组之间的频率复用,有效解决了家庭基站之间的同道干扰,提高系统容量和频谱效率。算法二在保障宏蜂窝用户QoS的基础上,进一步提高了家庭基站的频带利用率。对femtocell干扰协调技术的后续研究和femtocell的部署具有指导意义。
[Abstract]:With the continuous improvement of wireless rate requirements and the continuous development of data services, LTE commercial is imperative. LTE mainly focuses on 2.3 GHz, 2.6 GHz relatively high frequency band. The electromagnetic wave penetrating the building in this high frequency band will be subjected to great penetration loss, which will lead to a large decrease in signal quality. The research shows that in the macro cellular cell, About 2 / 3 voice services and more than 70% of data services occur indoors. Therefore, in order to solve the indoor coverage problem, the concept of home base station (femtocell) is introduced. The introduction of femtocell has brought serious interference problems to the traditional cellular system, because the home base station has the characteristics of plug and play. The deployment of home base station can not be planned and optimized, and a new interference coordination strategy is needed. This paper introduces the technical advantages and challenges of home base station, analyzes in detail the interference problems caused by the introduction of home base station, and on the basis of the research on the traditional inter-cell interference coordination strategy and the existing femtocell interference coordination technology, Aiming at the serious interference in the same layer of the home base station, the packet interference coordination algorithm of the home base station is improved. Firstly, the interference matrix is established according to the neighbor list obtained by the home base station, and then the home base station is grouped according to the interference matrix. The home base stations that interfere with each other are divided into a group. After the home base station is grouped, the frequency reuse can be independent between different groups. On the basis of orthogonal allocation of frequency resources, the load difference of home base station and the channel difference of users are fully considered in the same group of home base stations, and the dynamic allocation of frequency resources is carried out. In order to solve the problem of low efficiency of spectrum resources in algorithm 1, the interference coordination algorithm of spectrum sensing is improved. on the basis of home base station packet, cooperative spectrum sensing technology is used to detect the frequency band resources that are not occupied by macro cell users. According to the order of interference degree and load size, the idle frequency resources are occupied. On the basis of avoiding the interference between home base station and macro cell users, the spectrum efficiency is further improved. Through the simulation of the two algorithms, the size of the packet size of the home base station under different interference threshold and its influence on the allocation of frequency resources are analyzed, and under the appropriate interference threshold, It can be seen that the algorithm realizes the frequency reuse between different packets, effectively solves the same channel interference between home base stations, and improves the system capacity and spectral efficiency. Algorithm 2 further improves the band efficiency of home base station on the basis of ensuring macro cellular user QoS. It has guiding significance for the follow-up research of femtocell interference coordination technology and the deployment of femtocell.
【学位授予单位】：东北大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5

【相似文献】