基于功率控制的Femtocell异构网络干扰管理方法的研究与改进

发布时间：2018-06-01 14:55

本文选题：LTE + 家庭基站　；参考：《东北大学》2014年硕士论文

【摘要】：随着移动通信技术的发展,目前3GPP已经将LTE作为继3G系统之后的第四代移动通信(4G)技术。由于LTE系统使用高频率无线信号,使得其穿透能力差,极易导致在建筑物内形成信号覆盖盲区。而研究表明,大部分通信业务请求都是由用户在室内发起。因此基于改善室内信号覆盖与提高用户体验的目的,业界提出Femtoce11(毫微微蜂窝)。在LTE系统中,通过部署HeNB(家庭基站)形成Femtocell。HeNB由用户购买,即插即用,开机后即可与LTE宏蜂窝组成LTE-Femtocell异构系统。而部署HeNB前缺乏网络规划与设计,同时HeNB的部署也具有随机性,这必然导致家庭基站小区与宏蜂窝小区之间存在复杂地系统间干扰。因此,研究家庭基站干扰控制机制,尤其是家庭基站功率控制算法就具有重要意义。本论文基于LTE与Femtocell相关标准化协议与文献,详细分析LTE与Femtocell关键技术、LTE-Femtocell的部署场景、干扰场景,上下行链路功率控制机制,而后以下行链路干扰为切入点,重点研究了LTE与Femtocell同频部署时,家庭基站对宏蜂窝用户的干扰场景,归纳总结了五种家庭基站自适应功率控制算法以降低该干扰。最后基于对LTE开源系统级仿真平台,搭建适合本文的LTE-Femtocell系统级仿真平台,并基于该平台对之前总结的五种功率控制算法逐个进行系统级仿真。仿真结果显示,这五种功率控制算法虽然性能各有差异,有高有低,但均能有效权衡家庭基站用户系统性能(中断概率与平均吞吐量)与LTE宏蜂窝用户系统性能(中断概率),使得家庭基站对宏蜂窝下行的干扰有效降低。
[Abstract]:With the development of mobile communication technology, 3GPP has taken LTE as the fourth generation mobile communication technology after 3G system. Because of the high frequency wireless signal used in LTE system, the penetration ability of the system is poor, which can easily lead to the formation of blind area in the building. Research shows that most communication requests are initiated by users indoors. Therefore, for the purpose of improving indoor signal coverage and user experience, Femtoce11 is proposed. In LTE system, Femtocell.HeNB is formed by deploying HeNB (home base station), which is purchased by user, plug and play, and can be used to form LTE-Femtocell heterogeneous system with LTE macrocell after boot. However, there is a lack of network planning and design before the deployment of HeNB, and the deployment of HeNB is also random, which inevitably leads to complex system interference between the cell of the home base station and the cell of the macro cell. Therefore, it is of great significance to study the interference control mechanism of the home base station, especially the power control algorithm of the home base station. Based on the standardization protocol and literature of LTE and Femtocell, this paper analyzes in detail the deployment scenario, interference scenario, power control mechanism of uplink and downlink of the key technologies of LTE and Femtocell, and then the following line interference is taken as the breakthrough point. When LTE and Femtocell are deployed in the same frequency, the interference scene of the home base station to the macro cell user is studied, and five adaptive power control algorithms of the home base station are summarized to reduce the interference. Finally, based on the LTE open source system-level simulation platform, a LTE-Femtocell system-level simulation platform is built, and the five power control algorithms are simulated one by one based on the platform. The simulation results show that the five power control algorithms have different performance, high and low. However, both of them can effectively balance the performance of the home base station user system (interrupt probability and average throughput) and the LTE macro cellular user system performance (interrupt probability), which can effectively reduce the interference of the home base station to the macro cell downlink.
【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

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