【摘要】：作為L(zhǎng)TE-A系統(tǒng)中最有代表性的異構(gòu)網(wǎng)絡(luò)單元,Femtocell通過(guò)在室內(nèi)部署低功率接入節(jié)點(diǎn)(FAP),能夠有效地改善室內(nèi)無(wú)線覆蓋,為用戶提供更好的無(wú)線數(shù)據(jù)服務(wù)。但由于FAP是用戶根據(jù)自身要求自主安裝,缺少專(zhuān)門(mén)的網(wǎng)絡(luò)規(guī)劃與優(yōu)化,為傳統(tǒng)Macrocell引入了額外干擾,使得雙層網(wǎng)絡(luò)的干擾問(wèn)題變得更加復(fù)雜。為了降低此類(lèi)干擾,本文對(duì)雙層異構(gòu)網(wǎng)絡(luò)的無(wú)線資源配置展開(kāi)研究,主要從功率控制和頻率復(fù)用兩個(gè)方面探索降低異構(gòu)網(wǎng)絡(luò)內(nèi)部干擾的方案,研究?jī)?nèi)容圍繞以下三個(gè)主題展開(kāi):首先,對(duì)雙層網(wǎng)絡(luò)中斷概率進(jìn)行分析。利用空間泊松點(diǎn)過(guò)程對(duì)Femtocell基站進(jìn)行數(shù)學(xué)分析。在信號(hào)傳輸過(guò)程中,采用IMT-2000的路徑損耗傳播模型,利用Turk-Mani近似方法推導(dǎo)出Macrocell層和Femtocell層中斷概率的理論值,并通過(guò)仿真分析,對(duì)理論推導(dǎo)的準(zhǔn)確性進(jìn)行驗(yàn)證。其次,研究了Femtocell覆蓋及優(yōu)化方案。根據(jù)Femtocell下行中斷概率,求得Femtocell用戶(FUE)距離宏基站(MBS)的最小距離和FAP的最低發(fā)射功率。利用FAP的最低發(fā)射功率作為約束條件對(duì)典型的功率控制方案進(jìn)行改進(jìn),提出基于用戶距離和中斷概率的Femtocell覆蓋及優(yōu)化方案。仿真結(jié)果表明,提出方案不僅能有效地降低雙層網(wǎng)絡(luò)的中斷概率、提升用戶的通信質(zhì)量,而且能節(jié)約系統(tǒng)的功率資源。最后,研究分析了雙層網(wǎng)絡(luò)頻率復(fù)用方案。在對(duì)經(jīng)典的部分頻率復(fù)用方式(FFR)進(jìn)行研究的基礎(chǔ)上,提出了一種改進(jìn)的適用于雙層異構(gòu)網(wǎng)絡(luò)的FFR分配方式。在該方案中,整個(gè)系統(tǒng)頻帶被分為7個(gè)可用頻段,分別復(fù)用給不同區(qū)域不同扇區(qū)的用戶。宏小區(qū)中心區(qū)域的用戶使用頻率復(fù)用因子為1的一個(gè)子頻帶,邊緣區(qū)域每個(gè)扇區(qū)內(nèi)的用戶使用頻率復(fù)用因子為3的兩個(gè)頻帶,同時(shí)保證相鄰扇區(qū)間分配正交的頻帶。FAP通過(guò)感知宏小區(qū)的信號(hào)強(qiáng)度選擇接入合適的子頻帶,從而減少雙層網(wǎng)絡(luò)間的干擾。通過(guò)與經(jīng)典的FFR方案在子頻帶劃分、信干噪比、中斷概率及用戶的平均傳輸速率等方面進(jìn)行對(duì)比分析。實(shí)驗(yàn)仿真表明,改進(jìn)的部分頻率復(fù)用方式在性能指標(biāo)上比其他FFR方式更具優(yōu)越性。
[Abstract]:As the most representative heterogeneous network unit in LTE-A system, Femtocell can effectively improve indoor wireless coverage and provide better wireless data services for users by deploying low power access node (FAP), indoors. However, because FAP is installed independently by users according to their own requirements and lacks special network planning and optimization, the interference problem of double-layer network becomes more complex because of the introduction of additional interference for traditional Macrocell. In order to reduce this kind of interference, this paper studies the wireless resource allocation of double-layer heterogeneous networks, mainly from two aspects of power control and frequency reuse to explore the scheme to reduce the internal interference of heterogeneous networks. The research contents focus on the following three topics: firstly, the outage probability of double-layer networks is analyzed. The mathematical analysis of Femtocell base station is carried out by using the process of spatial Poisson point. In the process of signal transmission, the path loss propagation model of IMT-2000 is used, and the theoretical values of interrupt probability of Macrocell layer and Femtocell layer are derived by Turk-Mani approximate method, and the accuracy of the theoretical derivation is verified by simulation analysis. Secondly, the Femtocell coverage and optimization scheme are studied. According to the downlink interrupt probability of Femtocell, the minimum distance between Femtocell user (FUE) and macro base station (MBS) and the minimum transmission power of FAP are obtained. The typical power control scheme is improved by using the minimum transmission power of FAP as the constraint condition, and a Femtocell coverage and optimization scheme based on user distance and interrupt probability is proposed. The simulation results show that the proposed scheme can not only effectively reduce the interrupt probability of double-layer network, improve the communication quality of users, but also save the power resources of the system. Finally, the frequency reuse scheme of double-layer network is studied and analyzed. Based on the research of the classical partial frequency reuse (FFR), an improved FFR allocation method for double-layer heterogeneous networks is proposed. In this scheme, the whole system frequency band is divided into seven available frequency bands, which are reused to users in different regions and different sectors. The users in the central area of macro cell use a subband with frequency reuse factor 1, and the users in each sector in the edge region use two frequency bands with frequency reuse factor 3, while ensuring that the adjacent fan interval is allocated orthogonal frequency band. FAP accesses the appropriate subband by sensing the signal strength of macro cell, thus reducing the interference between double-layer networks. Compared with the classical FFR scheme, the subband division, signal-to-noise ratio (SNR), interrupt probability and average transmission rate of users are compared and analyzed. The experimental results show that the improved partial frequency reuse method has more advantages than other FFR methods in performance index.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TN929.5

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