异构蜂窝网络切换性能分析与研究
发布时间：2018-11-20 20:38
【摘要】：近几年来,移动智能终端数量迅速增加,移动数据流量呈现爆炸性的增长趋势,同时,通信系统可使用的频谱资源已经接近极限。为了增加网络容量和覆盖范围,提高频谱利用率,异构蜂窝网络的概念应运而生。这种网络的组网方式是在宏基站的覆盖内部署成本低、体积小、发送功率低并且覆盖范围小的小型蜂窝基站。异构蜂窝网络不仅可以使有限的频谱资源得到高效的利用,还可以增加网络容量和覆盖范围。切换对移动通信系统的容量和服务质量有重要影响,是移动通信系统中的重要研究课题。异构蜂窝网络的引入虽然解决了传统蜂窝网络中的容量和覆盖范围的问题,但也给切换带来了新的挑战。在传统的同构蜂窝网络中,终端在移动过程中使用相同的切换参数设置来进行切换。但是在异构蜂窝网络中,如果终端也使用相同的切换参数设置将会导致乒乓效应和切换失败的情况有所增加。所以,本文主要分析了切换参数对切换性能的影响,推导出了切换性能作为切换参数的函数的闭合表达式,最后可以根据具体的场景选择出最为合适的切换参数使切换性能达到最佳。本文所做的主要贡献包括:1.系统地介绍了异构蜂窝网络中切换的相关知识,讨论了影响异构蜂窝网络切换性能的因素,其中,切换参数的设置是影响切换性能的一个重要因素。2.分析了终端在一个两层异构蜂窝网络中的切换性能,得出了切换性能作为切换参数的函数的闭合表达式,仿真结果表明了此分析方法的正确性,进而可以选择最为合适的切换参数使切换性能达到最佳。根据仿真结果可以看出,两基站间的距离也是影响切换性能的一个重要因素。并且提出了一种降低乒乓效应的方法,可以在控制一定的切换失败概率的前提下,有效地降低发生乒乓效应的概率。3.分析了基于定向天线的异构蜂窝网络的切换性能。5G移动通信中引入了毫米波通信技术,其中一种典型的应用场景就是将毫米波小基站部署在宏基站的覆盖范围内。而毫米波小基站主要采用定向传输,所以切换场景将会发生变化。本文推导出了此场景下一个宏基站覆盖下的毫米波小基站的两层异构蜂窝网络的模型,分析了终端在此场景中的切换性能,得出了切换性能的闭合表达式,具体分析了基站间的距离对切换性能的影响,而且仿真结果也证明了此分析方法的正确,进而可以选择合适的切换参数使切换性能达到最佳。在此基础上,进一步分析了定向天线的一些变化对切换性能的影响。
[Abstract]:In recent years, the number of mobile intelligent terminals has increased rapidly, mobile data traffic has shown an explosive growth trend, at the same time, the spectrum resources available for communication systems have reached the limit. In order to increase network capacity and coverage and improve spectrum efficiency, the concept of heterogeneous cellular networks emerged as the times require. This network is based on a small cellular base station with low cost, small size, low transmission power and small coverage. Heterogeneous cellular networks can not only make efficient use of limited spectrum resources, but also increase network capacity and coverage. Handoff has an important impact on the capacity and quality of service (QoS) of mobile communication systems and is an important research topic in mobile communication systems. Although the introduction of heterogeneous cellular networks solves the problems of capacity and coverage in traditional cellular networks, it also brings new challenges to handoff. In the traditional isomorphic cellular network, the terminal switches with the same handoff parameters during the mobile process. However, in heterogeneous cellular networks, the ping-pong effect and handoff failure will be increased if the terminal also uses the same handoff parameter settings. Therefore, this paper mainly analyzes the influence of handover parameters on handoff performance, and deduces the closed expression of handoff performance as a function of switching parameters. Finally, we can select the most appropriate switching parameters according to the specific scenarios to achieve the best performance. The main contributions of this paper are as follows: 1. This paper systematically introduces the relevant knowledge of handoff in heterogeneous cellular networks, and discusses the factors that affect the performance of handoff in heterogeneous cellular networks. Among them, the setting of handoff parameters is an important factor affecting the handoff performance. The handoff performance of the terminal in a two-layer heterogeneous cellular network is analyzed, and the closed expression of the handover performance as a function of the handoff parameters is obtained. The simulation results show that the method is correct. Then we can select the most appropriate switching parameters to achieve the best performance. According to the simulation results, the distance between the two base stations is also an important factor affecting the handoff performance. A method to reduce the ping-pong effect is proposed, which can effectively reduce the probability of ping-pong effect on the premise of controlling a certain probability of switching failure. The handoff performance of heterogeneous cellular networks based on directional antennas is analyzed. The millimeter-wave communication technology is introduced into 5G mobile communication. One of the typical application scenarios is to deploy the millimeter-wave small base stations within the coverage of the base stations. And millimeter wave small base station mainly uses directional transmission, so the switching scene will change. This paper deduces the two-layer heterogeneous cellular network model of millimeter-wave small base station in this scenario, analyzes the handoff performance of the terminal in this scenario, and obtains the closed expression of handoff performance. The influence of the distance between the base stations on the handoff performance is analyzed in detail, and the simulation results show that the method is correct, and the optimal handoff performance can be achieved by selecting appropriate handover parameters. On this basis, the effect of some changes of directional antenna on the switching performance is further analyzed.
【学位授予单位】：杭州电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.5
本文编号：2345946
[Abstract]:In recent years, the number of mobile intelligent terminals has increased rapidly, mobile data traffic has shown an explosive growth trend, at the same time, the spectrum resources available for communication systems have reached the limit. In order to increase network capacity and coverage and improve spectrum efficiency, the concept of heterogeneous cellular networks emerged as the times require. This network is based on a small cellular base station with low cost, small size, low transmission power and small coverage. Heterogeneous cellular networks can not only make efficient use of limited spectrum resources, but also increase network capacity and coverage. Handoff has an important impact on the capacity and quality of service (QoS) of mobile communication systems and is an important research topic in mobile communication systems. Although the introduction of heterogeneous cellular networks solves the problems of capacity and coverage in traditional cellular networks, it also brings new challenges to handoff. In the traditional isomorphic cellular network, the terminal switches with the same handoff parameters during the mobile process. However, in heterogeneous cellular networks, the ping-pong effect and handoff failure will be increased if the terminal also uses the same handoff parameter settings. Therefore, this paper mainly analyzes the influence of handover parameters on handoff performance, and deduces the closed expression of handoff performance as a function of switching parameters. Finally, we can select the most appropriate switching parameters according to the specific scenarios to achieve the best performance. The main contributions of this paper are as follows: 1. This paper systematically introduces the relevant knowledge of handoff in heterogeneous cellular networks, and discusses the factors that affect the performance of handoff in heterogeneous cellular networks. Among them, the setting of handoff parameters is an important factor affecting the handoff performance. The handoff performance of the terminal in a two-layer heterogeneous cellular network is analyzed, and the closed expression of the handover performance as a function of the handoff parameters is obtained. The simulation results show that the method is correct. Then we can select the most appropriate switching parameters to achieve the best performance. According to the simulation results, the distance between the two base stations is also an important factor affecting the handoff performance. A method to reduce the ping-pong effect is proposed, which can effectively reduce the probability of ping-pong effect on the premise of controlling a certain probability of switching failure. The handoff performance of heterogeneous cellular networks based on directional antennas is analyzed. The millimeter-wave communication technology is introduced into 5G mobile communication. One of the typical application scenarios is to deploy the millimeter-wave small base stations within the coverage of the base stations. And millimeter wave small base station mainly uses directional transmission, so the switching scene will change. This paper deduces the two-layer heterogeneous cellular network model of millimeter-wave small base station in this scenario, analyzes the handoff performance of the terminal in this scenario, and obtains the closed expression of handoff performance. The influence of the distance between the base stations on the handoff performance is analyzed in detail, and the simulation results show that the method is correct, and the optimal handoff performance can be achieved by selecting appropriate handover parameters. On this basis, the effect of some changes of directional antenna on the switching performance is further analyzed.
【学位授予单位】：杭州电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.5
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