Small Cell網(wǎng)絡及其增強型技術(shù)的隨機幾何分析
發(fā)布時間：2019-02-09 06:54
【摘要】：近幾年來,small cell網(wǎng)絡技術(shù)作為一種新型的移動通信組網(wǎng)技術(shù),被認為是一種解決當前移動數(shù)據(jù)流量爆炸式增長的手段之一,也是移動通信技術(shù)演進及下一代移動通信網(wǎng)絡的關(guān)鍵技術(shù)之一。Small cell網(wǎng)絡因其基站具有較小的覆蓋范圍,使得網(wǎng)絡中的發(fā)射機能夠以較小的發(fā)射功率來達到一個較好的通信質(zhì)量,在減小能耗的同時還能夠盡可能的通過空分復用的方式來提高無線頻譜效率。 然后,由于small cell基站的密度會遠大于傳統(tǒng)的宏蜂窩基站,在這樣一個密集的網(wǎng)絡里面,如何協(xié)調(diào)這些基站間的干擾是一個不可避免的問題,這也是3GPP組織對small cell組網(wǎng)技術(shù)在LTE網(wǎng)絡中標準化工作的重心。本文在移動通信網(wǎng)絡的隨機幾何模型的基礎(chǔ)上,對small cell網(wǎng)絡進行數(shù)學建模,重點關(guān)注網(wǎng)絡的覆蓋概率,吞吐量和無線資源利用率,對small cell網(wǎng)絡建立起了一個數(shù)學模型。對該數(shù)學模型進行研究與分析,能夠以一個可解析的數(shù)學表達式的形式給出small cell網(wǎng)絡的性能參數(shù)。 通過這個基于隨機幾何的數(shù)學模型,很容易就能得到small cell網(wǎng)絡上行和下行的覆蓋概率。在此基礎(chǔ)上,提出了一種基于網(wǎng)絡中頻率隔離的干擾協(xié)調(diào)技術(shù)來對small cell網(wǎng)絡進行優(yōu)化的方法。 在本文中,特別關(guān)注了采用TDD-LTE制式的small cell網(wǎng)絡。由于small cell網(wǎng)絡中的用戶與業(yè)務具有特別大的不確定性,從而導致移動數(shù)據(jù)流量具有相當大的動態(tài)性,因此特別適用采用dynamic TDD的以提高small cell網(wǎng)絡的性能。通過本文所使用的隨機幾何模型可以得出dynamic TDD網(wǎng)絡下的上行與下行覆蓋概率,同時發(fā)現(xiàn)dynamic TDD網(wǎng)絡中的上行傳輸通信質(zhì)量受到了來自于視距下行small cell基站的嚴重干擾。為了解決這種dynamic TDD網(wǎng)絡中的串行干擾,本文中研究了一種基于發(fā)送空白幀的干擾協(xié)調(diào)技術(shù)。在數(shù)值結(jié)果中發(fā)現(xiàn),盡管這種干擾協(xié)調(diào)技術(shù)能夠提高dynamic TDD網(wǎng)絡中的上行通信質(zhì)量,但這是以犧牲網(wǎng)絡中下行無線資源為代價的。因此本文也對該協(xié)調(diào)技術(shù)中的參數(shù)做了一定的分析與優(yōu)化,以達到上行鏈路通信質(zhì)量與無線資源利用率的均衡。
[Abstract]:In recent years, as a new type of mobile communication networking technology, small cell network technology is considered as one of the methods to solve the explosive growth of mobile data traffic. . Small cell network is also one of the key technologies of mobile communication technology evolution and the next generation mobile communication network because of its base station has a relatively small coverage, The transmitter in the network can achieve a better communication quality with lower transmission power, and can improve the wireless spectrum efficiency by using space division multiplexing as much as possible while reducing the energy consumption. Then, because the density of small cell base station will be much higher than that of traditional macrocellular base station, in such a dense network, how to coordinate the interference between these base stations is an inevitable problem. This is also the focus of 3GPP's standardization of small cell networking technology in LTE networks. Based on the random geometric model of mobile communication network, this paper builds a mathematical model for small cell network, focusing on the coverage probability, throughput and radio resource utilization of small cell network. The mathematical model is studied and analyzed, and the performance parameters of small cell network can be given in the form of an analytic mathematical expression. By using this mathematical model based on random geometry, we can easily obtain the coverage probability of small cell network in uplink and downlink. Based on this, a method of interference coordination based on frequency isolation in the network is proposed to optimize the small cell network. In this paper, we pay special attention to the small cell network based on TDD-LTE. Due to the uncertainty of users and services in small cell networks, mobile data traffic is very dynamic, so it is especially suitable to use dynamic TDD to improve the performance of small cell networks. The probabilities of uplink and downlink coverage in dynamic TDD networks can be obtained by using the random geometric model used in this paper. At the same time, it is found that the uplink transmission quality in dynamic TDD networks is seriously disturbed by the small cell base stations in the line-of-sight and downlink networks. In order to solve the serial interference in the dynamic TDD network, a interference coordination technique based on transmitting blank frames is studied in this paper. Numerical results show that although this interference coordination technique can improve the quality of uplink communication in dynamic TDD networks, it is at the expense of the downlink wireless resources in the network. So this paper also analyzes and optimizes the parameters of the coordination technology to achieve the balance between the uplink communication quality and the utilization of wireless resources.
【學位授予單位】：北京郵電大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN929.5
本文編號：2418813
[Abstract]:In recent years, as a new type of mobile communication networking technology, small cell network technology is considered as one of the methods to solve the explosive growth of mobile data traffic. . Small cell network is also one of the key technologies of mobile communication technology evolution and the next generation mobile communication network because of its base station has a relatively small coverage, The transmitter in the network can achieve a better communication quality with lower transmission power, and can improve the wireless spectrum efficiency by using space division multiplexing as much as possible while reducing the energy consumption. Then, because the density of small cell base station will be much higher than that of traditional macrocellular base station, in such a dense network, how to coordinate the interference between these base stations is an inevitable problem. This is also the focus of 3GPP's standardization of small cell networking technology in LTE networks. Based on the random geometric model of mobile communication network, this paper builds a mathematical model for small cell network, focusing on the coverage probability, throughput and radio resource utilization of small cell network. The mathematical model is studied and analyzed, and the performance parameters of small cell network can be given in the form of an analytic mathematical expression. By using this mathematical model based on random geometry, we can easily obtain the coverage probability of small cell network in uplink and downlink. Based on this, a method of interference coordination based on frequency isolation in the network is proposed to optimize the small cell network. In this paper, we pay special attention to the small cell network based on TDD-LTE. Due to the uncertainty of users and services in small cell networks, mobile data traffic is very dynamic, so it is especially suitable to use dynamic TDD to improve the performance of small cell networks. The probabilities of uplink and downlink coverage in dynamic TDD networks can be obtained by using the random geometric model used in this paper. At the same time, it is found that the uplink transmission quality in dynamic TDD networks is seriously disturbed by the small cell base stations in the line-of-sight and downlink networks. In order to solve the serial interference in the dynamic TDD network, a interference coordination technique based on transmitting blank frames is studied in this paper. Numerical results show that although this interference coordination technique can improve the quality of uplink communication in dynamic TDD networks, it is at the expense of the downlink wireless resources in the network. So this paper also analyzes and optimizes the parameters of the coordination technology to achieve the balance between the uplink communication quality and the utilization of wireless resources.
【學位授予單位】：北京郵電大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN929.5
【參考文獻】
相關(guān)期刊論文 前4條
1 金勇;;中國聯(lián)通Small Cell建網(wǎng)策略[J];電信技術(shù);2012年S2期
2 吳剛;杜立新;潘煜;李林;;無線電頻譜資源價值研究——以移動通信、導航及廣播行業(yè)為例[J];北京郵電大學學報(社會科學版);2014年04期
3 趙振平;;淺析移動通信的發(fā)展現(xiàn)狀及趨勢[J];信息通信;2014年08期
4 任永剛;張亮;;第五代移動通信系統(tǒng)展望[J];信息通信;2014年08期
，本文編號：2418813
本文鏈接：http://www.sikaile.net/kejilunwen/wltx/2418813.html
最近更新
教材專著
