本文選題：家庭基站　切入點：干擾管理　出處：《西安電子科技大學》2014年碩士論文　論文類型：學位論文

【摘要】：無線通信發(fā)展到今天,已經(jīng)無處不在的改變著人類的日常生活。目前,LTE網(wǎng)絡已經(jīng)在世界范圍內得到大規(guī)模的部署。雖然LTE網(wǎng)絡在室外具有數(shù)據(jù)速率高、覆蓋范圍廣的優(yōu)勢,但是在室內,由于衰落的原因,其覆蓋效果并不理想。家庭基站是解決宏蜂窩網(wǎng)絡在室內覆蓋效果不佳的一種微基站,它通過寬帶與移動核心網(wǎng)相連,可以使用與宏基站相同的頻段,這樣,用戶進入室內后可以繼續(xù)連接到網(wǎng)絡而不用進行模式切換技術。在引入家庭基站后,由于是異構網(wǎng)絡,因此帶來了新的問題和挑戰(zhàn),其中最重要的挑戰(zhàn)之一便是家庭基站在異構網(wǎng)絡下的干擾管理。在異構網(wǎng)絡中,家庭基站不僅要解決由于與宏基站使用相同資源塊所帶來的跨層干擾問題,還需要解決家庭基站間的同層干擾問題。本文首先介紹了異構網(wǎng)絡下的干擾管理背景,然后對干擾場景及資源塊部署場景進行了分析及說明,并重點從兩個方面研究了LTE網(wǎng)絡下家庭基站的干擾管理技術。1)通過將家庭基站的不同資源塊需求個數(shù)加入到模型中并將非線性優(yōu)化模型轉化為線性優(yōu)化模型,研究了一種基于家庭基站帶寬需求的下行干擾管理算法。首先根據(jù)宏用戶的信干噪比門限值確定每個家庭基站的可用資源塊集合,從而實現(xiàn)對跨層干擾進行管理的目的;之后,以最大化家庭基站的資源塊有效利用率為目標,建立優(yōu)化問題模型,然后將非線性優(yōu)化模型轉換為線性優(yōu)化模型進行初始分配,再根據(jù)初始分配結果執(zhí)行一次資源塊再分配。仿真結果表明,本文算法能夠在使用更少的資源塊下,更好的滿足家庭基站的資源塊需求,提高資源塊的有效利用率。2)通過集中式的功率分配和分布式的功率調整兩個階段,研究了一種分階段的家庭基站下行功率控制方法。首先對每個家庭基站進行分布式功率控制,目的是在滿足最大發(fā)射功率限制的條件下最大化每個家庭基站的吞吐量;而后,依據(jù)宏用戶的SINR要求來相應的調整家庭基站的發(fā)射功率;最后,利用約束條件構建的指標函數(shù)來進行貪婪式的功率調整,提高家庭基站接入的有效資源塊比例。仿真結果表明,本文的方法能夠提升家庭基站的有效接入資源塊比例,同時能夠在對宏用戶保護的基礎上提高整個系統(tǒng)的吞吐量。
[Abstract]:Today, wireless communication has changed the daily life of human beings everywhere. At present, the LTE network has been deployed on a large scale around the world. Although LTE network has the advantages of high data rate and wide coverage outside, But in the indoor, because of the decline, the coverage effect is not ideal. The home base station is a kind of micro-base station which solves the problem of the poor indoor coverage of the macrocellular network. It is connected with the mobile core network through the broadband. It is possible to use the same frequency band as the Acer station, so that the user can continue to connect to the network without mode switching after entering the room. After the introduction of the home base station, the heterogeneous network brings new problems and challenges. One of the most important challenges is the interference management of home base stations in heterogeneous networks. In heterogeneous networks, home base stations not only address the cross-layer interference caused by the use of the same resource blocks as Acer stations. In this paper, the background of interference management in heterogeneous network is introduced, and then the interference scene and resource block deployment scenario are analyzed and explained. The interference management technology of the home base station in LTE network is studied from two aspects. (1) by adding the number of different resource blocks of the cell base station into the model, the nonlinear optimization model is transformed into the linear optimization model. In this paper, a downlink interference management algorithm based on the bandwidth requirement of the home base station is studied. Firstly, the set of available resource blocks of each home base station is determined according to the threshold value of the signal-to-noise ratio of the macro user, so as to achieve the purpose of managing the cross-layer interference. In order to maximize the effective utilization of the resource block of the cell base station, the optimization problem model is established, and then the nonlinear optimization model is transformed into the linear optimization model for initial allocation. The simulation results show that the proposed algorithm can better meet the resource block requirements of the home base station under the condition of using fewer resource blocks. By means of centralized power allocation and distributed power adjustment, a phased downlink power control method for home base stations is studied. Firstly, distributed power control is applied to each family base station. The purpose is to maximize the throughput of each cell base station under the condition of maximum transmission power limit; then adjust the transmission power of the home base station according to the SINR requirements of the macro user. The index function constructed by the constraint condition is used to adjust the greedy power to increase the proportion of the effective resource block of the home base station access. The simulation results show that the method in this paper can increase the proportion of the effective access resource block of the home base station. At the same time, the throughput of the whole system can be improved on the basis of macro-user protection.
【學位授予單位】：西安電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN929.5

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相關期刊論文 前1條

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本文編號：1571118