異構(gòu)蜂窩網(wǎng)絡(luò)切換性能分析與研究
發(fā)布時(shí)間：2018-11-20 20:38
【摘要】：近幾年來(lái),移動(dòng)智能終端數(shù)量迅速增加,移動(dòng)數(shù)據(jù)流量呈現(xiàn)爆炸性的增長(zhǎng)趨勢(shì),同時(shí),通信系統(tǒng)可使用的頻譜資源已經(jīng)接近極限。為了增加網(wǎng)絡(luò)容量和覆蓋范圍,提高頻譜利用率,異構(gòu)蜂窩網(wǎng)絡(luò)的概念應(yīng)運(yùn)而生。這種網(wǎng)絡(luò)的組網(wǎng)方式是在宏基站的覆蓋內(nèi)部署成本低、體積小、發(fā)送功率低并且覆蓋范圍小的小型蜂窩基站。異構(gòu)蜂窩網(wǎng)絡(luò)不僅可以使有限的頻譜資源得到高效的利用,還可以增加網(wǎng)絡(luò)容量和覆蓋范圍。切換對(duì)移動(dòng)通信系統(tǒng)的容量和服務(wù)質(zhì)量有重要影響,是移動(dòng)通信系統(tǒng)中的重要研究課題。異構(gòu)蜂窩網(wǎng)絡(luò)的引入雖然解決了傳統(tǒng)蜂窩網(wǎng)絡(luò)中的容量和覆蓋范圍的問(wèn)題,但也給切換帶來(lái)了新的挑戰(zhàn)。在傳統(tǒng)的同構(gòu)蜂窩網(wǎng)絡(luò)中,終端在移動(dòng)過(guò)程中使用相同的切換參數(shù)設(shè)置來(lái)進(jìn)行切換。但是在異構(gòu)蜂窩網(wǎng)絡(luò)中,如果終端也使用相同的切換參數(shù)設(shè)置將會(huì)導(dǎo)致乒乓效應(yīng)和切換失敗的情況有所增加。所以,本文主要分析了切換參數(shù)對(duì)切換性能的影響,推導(dǎo)出了切換性能作為切換參數(shù)的函數(shù)的閉合表達(dá)式,最后可以根據(jù)具體的場(chǎng)景選擇出最為合適的切換參數(shù)使切換性能達(dá)到最佳。本文所做的主要貢獻(xiàn)包括:1.系統(tǒng)地介紹了異構(gòu)蜂窩網(wǎng)絡(luò)中切換的相關(guān)知識(shí),討論了影響異構(gòu)蜂窩網(wǎng)絡(luò)切換性能的因素,其中,切換參數(shù)的設(shè)置是影響切換性能的一個(gè)重要因素。2.分析了終端在一個(gè)兩層異構(gòu)蜂窩網(wǎng)絡(luò)中的切換性能,得出了切換性能作為切換參數(shù)的函數(shù)的閉合表達(dá)式,仿真結(jié)果表明了此分析方法的正確性,進(jìn)而可以選擇最為合適的切換參數(shù)使切換性能達(dá)到最佳。根據(jù)仿真結(jié)果可以看出,兩基站間的距離也是影響切換性能的一個(gè)重要因素。并且提出了一種降低乒乓效應(yīng)的方法,可以在控制一定的切換失敗概率的前提下,有效地降低發(fā)生乒乓效應(yīng)的概率。3.分析了基于定向天線的異構(gòu)蜂窩網(wǎng)絡(luò)的切換性能。5G移動(dòng)通信中引入了毫米波通信技術(shù),其中一種典型的應(yīng)用場(chǎng)景就是將毫米波小基站部署在宏基站的覆蓋范圍內(nèi)。而毫米波小基站主要采用定向傳輸,所以切換場(chǎng)景將會(huì)發(fā)生變化。本文推導(dǎo)出了此場(chǎng)景下一個(gè)宏基站覆蓋下的毫米波小基站的兩層異構(gòu)蜂窩網(wǎng)絡(luò)的模型,分析了終端在此場(chǎng)景中的切換性能,得出了切換性能的閉合表達(dá)式,具體分析了基站間的距離對(duì)切換性能的影響,而且仿真結(jié)果也證明了此分析方法的正確,進(jìn)而可以選擇合適的切換參數(shù)使切換性能達(dá)到最佳。在此基礎(chǔ)上,進(jìn)一步分析了定向天線的一些變化對(duì)切換性能的影響。
[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.
【學(xué)位授予單位】：杭州電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN929.5
本文編號(hào)：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.
【學(xué)位授予單位】：杭州電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN929.5
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，本文編號(hào)：2345946
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