LTE家庭基站切换机制的研究与改进

发布时间：2018-01-19 07:44

本文关键词： LTE 家庭基站切换自组织网络反馈　出处：《东北大学》2014年硕士论文　论文类型：学位论文

【摘要】：家庭基站对改善室内无线信号覆盖提供了新的解决方案,它工作在授权频段,功率小,成本低,安装灵活方便,不需要改变核心网,而且服务质量较高,近年来愈加成为研究的热点。在正式融入LTE网络架构时,由于其部署的随机性和覆盖范围有限性等特性,对LTE切换系统提出了更高的技术要求。然而在LTE现行规范中,对家庭基站的诸多标准并未完善,小区切换问题日益凸显。本论文基于家庭基站在LTE框架下的切换过程,针对家庭基站和宏基站间切换困难,无线链路失败(RLF)率高,家庭基站小区切换准入标准复杂,无线资源浪费等问题,分析了家庭基站的特殊性和用户随机性等实际情况,结合反馈原理和自组织网络原理对已有的切换算法提出了改进和优化。改进的新算法将网络反馈的结果报告进行统计,并根据报告情况自主调节与切换判决和控制相关的参数,然后算法的下一个流程将按照经过微调的参数进行工作,从而达到动态调整切换参数的目的,使切换过程根据网络动态随时更新。另外针对频繁切换和不必要切换问题,提出了新的双门限优化方案,改良的切换发生的环境,这是无线资源管理的重要组成部分,具有很强的实用性,使其更加适应复杂多变的通信环境。最后通过Matlab平台,就切换失败率较高,频繁切换,以及不必要切换问题进行了仿真实验,与现有切换机制对比,表明切换失败率大大改善,频繁切换和不必要切换发生的概率也明显降低,从而验证了改进算法的优良性能。
[Abstract]:The home base station provides a new solution to improve indoor wireless signal coverage. It works in the authorized frequency band, low power, low cost, flexible installation, no need to change the core network, and high quality of service. In recent years, it has become a hot topic of research. In the formal integration of LTE network architecture, due to its deployment randomness and limited coverage and other characteristics. Higher technical requirements have been put forward for LTE handoff system. However, in the current LTE specification, many standards for the home base station are not perfect. The cell handover problem is becoming more and more prominent. Based on the handoff process of the home base station under the LTE framework, the wireless link failure rate is high because of the difficult handoff between the home base station and the macro base station. This paper analyzes the particularity of home base station and the randomness of users, etc., such as the complexity of the admission standard and the waste of wireless resources in the cell of the home base station. Based on the feedback principle and the self-organizing network principle, the existing handoff algorithms are improved and optimized. The improved new algorithm is used to report the results of the network feedback. The parameters related to switching decision and control are automatically adjusted according to the report, and then the next flow of the algorithm will work according to the fine-tuned parameters, so as to achieve the purpose of dynamically adjusting the switching parameters. The handoff process is updated according to the network dynamics. In addition, a new dual-threshold optimization scheme is proposed to solve the problem of frequent handoff and unnecessary handoff, and the improved handoff environment is proposed. This is an important part of wireless resource management, with strong practicability, make it more suitable for the complex and changeable communication environment. Finally, through the Matlab platform, the failure rate of handoff is high and frequent handoff. The simulation results show that the failure rate of handoff is greatly improved, and the probability of frequent and unnecessary handoff is obviously reduced. The excellent performance of the improved algorithm is verified.
【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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