本文選題：長期演進增強版 + 異構網(wǎng)絡�。� 參考：《電子科技大學》2014年碩士論文

【摘要】：隨著移動互聯(lián)網(wǎng)日漸成為未來網(wǎng)絡發(fā)展的方向,移動終端在接入互聯(lián)網(wǎng)時將優(yōu)先選擇已經(jīng)廣泛部署的移動通信網(wǎng)絡,使得用戶大量涌入無線通信系統(tǒng)獲得數(shù)據(jù)流量。另外,相關研究表明未來60%~80%的移動數(shù)據(jù)業(yè)務的場景發(fā)生改變。越來越多的用戶選擇在室內(nèi)使用移動數(shù)據(jù)業(yè)務,并且大量用戶聚集的公共場所也將形成熱點區(qū)域。傳統(tǒng)的蜂窩網(wǎng)絡架構并不能適應這種應用場景的新變化,必須引入新型網(wǎng)絡架構以滿足用戶需求。第三代合作伙伴計劃(3rd Generation Partnership Project,3GPP)在長期演進增強版(Long Term Evolution-Advanced,LTE-Advanced)系統(tǒng)中加入了多種低功率節(jié)點。而這種新型的網(wǎng)絡架構被稱為異構網(wǎng)絡。而由于異構網(wǎng)絡復雜的拓撲特征,不可避免地帶來嚴重的層間干擾問題。通過節(jié)點間信息的協(xié)調(diào)交互可以有效的減少以上的干擾問題。另外,低功率節(jié)點的引入導致異構網(wǎng)絡節(jié)點密集分布,這為節(jié)點間的協(xié)作通信提供可能。綜上,協(xié)作通信是異構網(wǎng)絡提高系統(tǒng)性能的重要手段。本文首先介紹了LTE-Advanced系統(tǒng)、異構網(wǎng)絡部署方案及傳統(tǒng)的協(xié)作通信技術。然后基于LTE-Advanced系統(tǒng)中宏(Macro)基站和微微(Pico)基站共存的異構網(wǎng)絡,本文中提出了一種資源塊級別的跨層協(xié)作傳輸機制。此協(xié)作傳輸機制采用相干傳輸預編碼技術,能夠使得多個協(xié)作用戶在同一個資源塊上接受協(xié)作簇中多個協(xié)作基站的服務以減少層間干擾。基于上述的跨層協(xié)作傳輸框架,本文還提出了一種協(xié)作資源塊分配策略,實現(xiàn)Macro基站和Pico基站的協(xié)作無線資源控制。為驗證上述的跨層協(xié)作傳輸技術,研究中搭建了基于LTE-Advanced的異構網(wǎng)絡系統(tǒng)級仿真平臺。并且通過對異構網(wǎng)絡系統(tǒng)性能的仿真,表明所提出的協(xié)作傳輸機制在系統(tǒng)吞吐量性能方面優(yōu)于3GPP標準化的的小區(qū)間干擾協(xié)調(diào)增強技術。最后,為適應更高系統(tǒng)容量和頻譜效率的5G網(wǎng)絡的無線接入技術,根據(jù)非正交多址技術(Non-Orthogonal Multiple Access,NOMA)原理,提出了結合NOMA的異構網(wǎng)絡協(xié)作通信機制,以解決異構網(wǎng)絡中小區(qū)范圍擴展區(qū)域內(nèi)的層間干擾問題。在此異構網(wǎng)絡協(xié)作通信系統(tǒng)的基礎上,采用了宏基站和低功率基站間的協(xié)作用戶調(diào)度和協(xié)作功率分配機制。經(jīng)過系統(tǒng)級仿真驗證,采用此協(xié)作通信技術可以得到顯著的系統(tǒng)吞吐量性能增益。
[Abstract]:With the mobile Internet becoming the direction of the future network development, mobile terminals will give priority to the mobile communication network which has been widely deployed when accessing the Internet, which makes users pour into wireless communication systems to obtain data traffic. In addition, research indicates that 60% of mobile data traffic scenarios will change in the future. More and more users choose to use mobile data services indoors, and a large number of public places where users gather will form hot spots. The traditional cellular network architecture can not adapt to the new changes of the application scenario, so it is necessary to introduce a new network architecture to meet the needs of users. The 3rd Generation Partnership Project 3GPP adds a variety of low-power nodes to the long term Evolution-Evolution-Advanced system. This new network architecture is called heterogeneous network. Due to the complex topological characteristics of heterogeneous networks, it inevitably brings serious interlayer interference problem. The above problems can be effectively reduced by the coordination and interaction of information between nodes. In addition, the introduction of low power nodes leads to the dense distribution of heterogeneous network nodes, which provides the possibility for cooperative communication between nodes. In summary, cooperative communication is an important means to improve system performance in heterogeneous networks. This paper first introduces LTE-Advanced system, heterogeneous network deployment scheme and traditional cooperative communication technology. Then, based on the heterogeneous network where Macro and Pico base stations coexist in LTE-Advanced system, a cross-layer cooperative transmission mechanism at resource block level is proposed in this paper. The cooperative transmission mechanism uses coherent transmission precoding technology to enable multiple cooperative users to receive the services of multiple cooperative base stations in the collaboration cluster on the same resource block in order to reduce interlayer interference. Based on the above cross-layer cooperative transmission framework, this paper also proposes a cooperative resource block allocation strategy to realize the cooperative radio resource control between Macro base station and Pico base station. In order to verify the above cross-layer cooperative transmission technology, a heterogeneous network system-level simulation platform based on LTE-Advanced was built. The simulation of heterogeneous network system shows that the proposed cooperative transmission mechanism is superior to the 3GPP standardized inter-cell interference coordination enhancement technique in system throughput performance. Finally, in order to adapt to the wireless access technology of 5G network with higher system capacity and spectral efficiency, according to the principle of Non-orthogonal multiple access (NOMA), a cooperative communication mechanism based on NOMA for heterogeneous networks is proposed. In order to solve the problem of interlayer interference in the extended area of cell scope in heterogeneous networks. Based on this heterogeneous network cooperative communication system, the cooperative user scheduling and cooperative power allocation mechanism between the macro base station and the low power base station are adopted. The system level simulation shows that the system throughput performance gain can be achieved by using this cooperative communication technology.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN929.5

【參考文獻】

相關碩士學位論文 前1條

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本文編號：2097917