【摘要】：近幾年來,small cell網(wǎng)絡(luò)技術(shù)作為一種新型的移動(dòng)通信組網(wǎng)技術(shù),被認(rèn)為是一種解決當(dāng)前移動(dòng)數(shù)據(jù)流量爆炸式增長(zhǎng)的手段之一,也是移動(dòng)通信技術(shù)演進(jìn)及下一代移動(dòng)通信網(wǎng)絡(luò)的關(guān)鍵技術(shù)之一。Small cell網(wǎng)絡(luò)因其基站具有較小的覆蓋范圍,使得網(wǎng)絡(luò)中的發(fā)射機(jī)能夠以較小的發(fā)射功率來達(dá)到一個(gè)較好的通信質(zhì)量,在減小能耗的同時(shí)還能夠盡可能的通過空分復(fù)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(huì)遠(yuǎn)大于傳統(tǒng)的宏蜂窩基站,在這樣一個(gè)密集的網(wǎng)絡(luò)里面,如何協(xié)調(diào)這些基站間的干擾是一個(gè)不可避免的問題,這也是3GPP組織對(duì)small cell組網(wǎng)技術(shù)在LTE網(wǎng)絡(luò)中標(biāo)準(zhǔn)化工作的重心。本文在移動(dòng)通信網(wǎng)絡(luò)的隨機(jī)幾何模型的基礎(chǔ)上,對(duì)small cell網(wǎng)絡(luò)進(jìn)行數(shù)學(xué)建模,重點(diǎn)關(guān)注網(wǎng)絡(luò)的覆蓋概率,吞吐量和無線資源利用率,對(duì)small cell網(wǎng)絡(luò)建立起了一個(gè)數(shù)學(xué)模型。對(duì)該數(shù)學(xué)模型進(jìn)行研究與分析,能夠以一個(gè)可解析的數(shù)學(xué)表達(dá)式的形式給出small cell網(wǎng)絡(luò)的性能參數(shù)。 通過這個(gè)基于隨機(jī)幾何的數(shù)學(xué)模型,很容易就能得到small cell網(wǎng)絡(luò)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(luò)中頻率隔離的干擾協(xié)調(diào)技術(shù)來對(duì)small cell網(wǎng)絡(luò)進(jìn)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(luò)。由于small cell網(wǎng)絡(luò)中的用戶與業(yè)務(wù)具有特別大的不確定性,從而導(dǎo)致移動(dòng)數(shù)據(jù)流量具有相當(dāng)大的動(dòng)態(tài)性,因此特別適用采用dynamic TDD的以提高small cell網(wǎng)絡(luò)的性能。通過本文所使用的隨機(jī)幾何模型可以得出dynamic TDD網(wǎng)絡(luò)下的上行與下行覆蓋概率,同時(shí)發(fā)現(xiàn)dynamic TDD網(wǎng)絡(luò)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(yán)重干擾。為了解決這種dynamic TDD網(wǎng)絡(luò)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(luò)中的上行通信質(zhì)量,但這是以犧牲網(wǎng)絡(luò)中下行無線資源為代價(jià)的。因此本文也對(duì)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(dá)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(xué)位授予單位】：北京郵電大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN929.5

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本文編號(hào)：2418813