發(fā)布時間：2018-04-23 08:24

  本文選題：TD-LTE-Advanced + 中繼技術(shù)��； 參考：《哈爾濱工業(yè)大學(xué)》2015年碩士論文

【摘要】：近幾年中,人們對移動通信的高數(shù)據(jù)速率、高服務(wù)質(zhì)量、業(yè)務(wù)多樣化的需求日益增長,為了應(yīng)對這個趨勢,第三代合作伙伴計劃組織提出了以LTE為基礎(chǔ)的LTE-Advanced系統(tǒng)。相對于LTE系統(tǒng),LTE-Advanced系統(tǒng)中引入了幾個關(guān)鍵技術(shù),其中包括能夠擴(kuò)大小區(qū)覆蓋范圍、提高小區(qū)邊緣吞吐量、增強(qiáng)用戶公平性的中繼技術(shù)。中繼具有架設(shè)方便、成本低的優(yōu)點,已經(jīng)成為目前LTE-Advanced系統(tǒng)中的研究熱點。為了更好地利用中繼以提升系統(tǒng)的性能,中繼系統(tǒng)中的資源調(diào)度是至關(guān)重要的。目前LTE存在兩大主流標(biāo)準(zhǔn),其中,由我國主導(dǎo)制定的TD-LTE標(biāo)準(zhǔn)也正向TD-LTE-Advanced演進(jìn),本文基于TD-LTE-Advanced系統(tǒng),研究中繼系統(tǒng)的資源調(diào)度算法。本文首先闡述了TD-LTE-Advanced中繼系統(tǒng)的中繼分類及架構(gòu)、物理層相關(guān)技術(shù)的理論知識,確定了中繼系統(tǒng)中下行資源調(diào)度的過程。同時研究了中繼技術(shù)對系統(tǒng)性能帶來的影響,在仿真平臺上與無中繼場景進(jìn)行對比仿真,結(jié)果說明中繼技術(shù)的引入提升了小區(qū)邊緣用戶性能以及系統(tǒng)的總體性能。然后,本文對TD-LTE-A中繼系統(tǒng)的保證Qo S需求的資源調(diào)度算法進(jìn)行了深入的研究。首先設(shè)定了傳輸不同Qo S業(yè)務(wù)的中繼場景,基于對TD-LTE-A標(biāo)準(zhǔn)中規(guī)定的Qo S的總結(jié),定義了適用于中繼場景的Qo S需求。針對上述場景,本文提出了保證Qo S需求的資源調(diào)度算法,分為回程子幀的調(diào)度和接入子幀的調(diào)度,并在本文搭建的TD-LTE-A中繼系統(tǒng)的系統(tǒng)級仿真平臺上和現(xiàn)有算法進(jìn)行對比仿真了,仿真結(jié)果表明,所提算法能夠?qū)崿F(xiàn)低丟包率、較好地滿足GBR需求,兼顧中繼用戶和直傳用戶的性能,實現(xiàn)較高的系統(tǒng)吞吐量和公平性。最后,本文針對TD-LTE-A多天線中繼系統(tǒng)的傳輸場景,研究并確定了各條鏈路的傳輸模式以及采用的預(yù)編碼和檢測算法,在搭建的TD-LTE-A多天線仿真平臺上驗證了結(jié)合多天線技術(shù)為系統(tǒng)帶來的增益。為了進(jìn)一步提高系統(tǒng)性能,本文提出了低反饋開銷并考慮公平性的資源調(diào)度算法,算法分為三個子問題求解。仿真結(jié)果表明,本文提出的多天線中繼系統(tǒng)的資源調(diào)度算法在資源劃分的過程中能夠較好地兼顧用戶的公平性和系統(tǒng)吞吐量,在回程鏈路的調(diào)度過程中可以大大減少反饋開銷,通過最大化系統(tǒng)的比例公平效用函數(shù)值可以同時提高系統(tǒng)的吞吐量和用戶的公平性。
[Abstract]:In recent years, the demand for high data rate, high quality of service and diversification of services in mobile communication has been increasing. In order to cope with this trend, the third Generation Partnership Program has proposed a LTE-Advanced system based on LTE. Compared with LTE system, several key technologies are introduced, including relay technology, which can expand cell coverage, improve cell edge throughput and enhance user fairness. Relay has the advantages of convenient installation and low cost, so it has become a research hotspot in LTE-Advanced system. In order to make better use of relay to improve system performance, resource scheduling in relay system is very important. At present, there are two main standards in LTE, among which, the TD-LTE standard, which is developed by our country, is also evolving to TD-LTE-Advanced. This paper studies the resource scheduling algorithm of relay system based on TD-LTE-Advanced system. In this paper, the classification and architecture of relay in TD-LTE-Advanced relay system and the theoretical knowledge of physical layer related technology are introduced firstly, and the process of downlink resource scheduling in relay system is determined. At the same time, the impact of relay technology on the system performance is studied. The simulation results show that the relay technology can improve the performance of the cell edge users and the overall performance of the system. Then, the resource scheduling algorithm for TD-LTE-A relay system to meet QoS requirements is studied. First, the relay scenarios for different QoS services are set up. Based on the summary of QoS specified in TD-LTE-A standard, the QoS requirements for relay scenarios are defined. For the above scenarios, this paper proposes a resource scheduling algorithm to meet the QoS requirements, which is divided into backhaul subframe scheduling and access sub-frame scheduling. The simulation results on the system-level simulation platform of the TD-LTE-A relay system are compared with the existing algorithms. The simulation results show that the proposed algorithm can achieve low packet loss rate and better meet the needs of GBR. The performance of relay users and direct users is taken into account to achieve high system throughput and fairness. Finally, according to the transmission scene of TD-LTE-A multi-antenna relay system, the transmission mode of each link and the precoding and detection algorithm are studied and determined. On the TD-LTE-A multi-antenna simulation platform, the gain of the system is verified by combining the multi-antenna technology. In order to further improve the performance of the system, a resource scheduling algorithm with low feedback overhead and fairness is proposed. The algorithm is divided into three sub-problems. Simulation results show that the proposed multi-antenna relay system resource scheduling algorithm in the process of resource division can better balance the fairness of users and system throughput, in the return link scheduling process can greatly reduce the feedback overhead. By maximizing the utility function of proportional fairness, the throughput of the system and the fairness of users can be improved at the same time.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN929.5

【參考文獻(xiàn)】

相關(guān)期刊論文 前2條

1 趙欣麗;;LTE-Advanced系統(tǒng)中繼技術(shù)綜述[J];電子質(zhì)量;2010年09期

2 韓智;郭愛煌;;中繼OFDMA系統(tǒng)混合業(yè)務(wù)的分步跨層調(diào)度算法[J];計算機(jī)應(yīng)用研究;2011年07期

，

本文編號：1791181