LTE边界覆盖特性对切换门限的影响
发布时间：2018-08-06 12:43
【摘要】：随着蜂窝移动通信系统的发展,切换将是移动用户在移动过程中实现无缝的链路连接、得到良好的用户体验的重要保障。而在LTE系统中,高速的数据传输率和多媒体服务需求要求切换能更快速而有效的完成。由于LTE的网络结构以及覆盖特性与2G、3G的不同,切换性能的影响因素也更加多样化,其中切换门限的选取就是一个值得研究的重要因素。考虑到小区的覆盖特性以及用户自身的相关特征,对所有切换事件设置相同的切换门限是非常不合理的。因此,基于LTE的网络覆盖特性和切换技术,本文主要对公网中的不同移动速度和不同小区类型以及铁路专网中的切换门限设置做了相关研究,以优化切换性能。 论文主要内容安排如下,首先总结分析了LTE系统中的小区覆盖性能；然后详细介绍了LTE系统中的切换技术,包括切换流程、切换触发事件、切换信令流程和切换门限参数,并总结了现有的切换策略；接下来重点研究了公网中相同切换门限参数下不同移动速度和服务小区类型对切换性能的影响,并在此基础上通过仿真分析链路连接失败概率和乒乓切换概率来研究设置合理的切换门限参数；最后,介绍了高铁环境下LTE网络覆盖特性,并提出了一种用速度传感器捕获列车位置信息来辅助切换、修改切换门限的切换机制,主要思想是通过速度传感器感知列车的实时速度来计算列车与eNodeB间的距离,并向源eNodeB报告,从而实现列车位置辅助的切换。同时,通过仿真比较了位置辅助和传统切换算法的切换发生概率和切换中断概率,结果表明速度传感器的位置辅助切换能够帮助减少高速引起的乒乓切换。
[Abstract]:With the development of cellular mobile communication system, handoff will be an important guarantee for mobile users to realize seamless link connection and get a good user experience. In LTE system, high speed data transmission rate and multimedia service requirement require switching to be completed more quickly and effectively. Because the network structure and coverage characteristics of LTE are different from that of 2GN 3G, the influence factors of handoff performance are more diversified, among which the selection of handoff threshold is an important factor worth studying. Considering the coverage characteristics of the cell and the related characteristics of the user itself, it is very unreasonable to set the same handover threshold for all handover events. Therefore, based on the network coverage characteristics and handoff technology of LTE, this paper mainly studies the different moving speeds and different cell types in the public network, as well as the handover threshold setting in the railway private network, in order to optimize the handoff performance. The main contents of this paper are as follows: firstly, the cell coverage performance in LTE system is summarized and analyzed, and then the handover technology in LTE system is introduced in detail, including handover process, handoff trigger event, handover signaling flow and handover threshold parameters. Then, the effects of different speed and cell type on handoff performance under the same handoff threshold parameters in public network are studied. On this basis, through the simulation analysis of link connection failure probability and ping-pong switching probability, the reasonable switching threshold parameters are studied. Finally, the coverage characteristics of LTE network under high-speed rail environment are introduced. A switching mechanism is proposed in which the train position information is captured by the speed sensor and the switch threshold is modified. The main idea is to calculate the distance between the train and the eNodeB by using the speed sensor to perceive the real time speed of the train. And report to the source eNodeB, so as to achieve the train position assist switching. At the same time, the switching probability and interrupt probability of position assistant and traditional handoff algorithm are compared by simulation. The results show that the position-assisted switching of speed sensor can help to reduce the ping-pong switch caused by high speed.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5
本文编号：2167776
[Abstract]:With the development of cellular mobile communication system, handoff will be an important guarantee for mobile users to realize seamless link connection and get a good user experience. In LTE system, high speed data transmission rate and multimedia service requirement require switching to be completed more quickly and effectively. Because the network structure and coverage characteristics of LTE are different from that of 2GN 3G, the influence factors of handoff performance are more diversified, among which the selection of handoff threshold is an important factor worth studying. Considering the coverage characteristics of the cell and the related characteristics of the user itself, it is very unreasonable to set the same handover threshold for all handover events. Therefore, based on the network coverage characteristics and handoff technology of LTE, this paper mainly studies the different moving speeds and different cell types in the public network, as well as the handover threshold setting in the railway private network, in order to optimize the handoff performance. The main contents of this paper are as follows: firstly, the cell coverage performance in LTE system is summarized and analyzed, and then the handover technology in LTE system is introduced in detail, including handover process, handoff trigger event, handover signaling flow and handover threshold parameters. Then, the effects of different speed and cell type on handoff performance under the same handoff threshold parameters in public network are studied. On this basis, through the simulation analysis of link connection failure probability and ping-pong switching probability, the reasonable switching threshold parameters are studied. Finally, the coverage characteristics of LTE network under high-speed rail environment are introduced. A switching mechanism is proposed in which the train position information is captured by the speed sensor and the switch threshold is modified. The main idea is to calculate the distance between the train and the eNodeB by using the speed sensor to perceive the real time speed of the train. And report to the source eNodeB, so as to achieve the train position assist switching. At the same time, the switching probability and interrupt probability of position assistant and traditional handoff algorithm are compared by simulation. The results show that the position-assisted switching of speed sensor can help to reduce the ping-pong switch caused by high speed.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5
【参考文献】
相关期刊论文 前4条
1 肖清华;杨春德;张X;;TD-LTE覆盖能力综合分析[J];邮电设计技术;2012年01期
2 沈嘉;;3GPP LTE物理层标准化最新进展[J];移动通信;2007年12期
3 罗凡云;郭俊峰;;TD-LTE网络覆盖性能分析[J];移动通信;2010年05期
4 郭军伟;;高速移动列车无线组网方案[J];中兴通讯技术;2010年02期
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