【摘要】：為了保持在無線寬帶接入市場的領(lǐng)先地位，3GPP需要克服來自WiMAX、WiFi等無線寬帶接入技術(shù)的挑戰(zhàn)。因此，3GPP提出了長期演進計劃LTE。伴隨著移動通信網(wǎng)絡(luò)呈現(xiàn)出寬帶化、移動化以及IP化的趨勢，LTE將匯集蜂窩移動通信、固定寬帶無線接入、移動寬帶無線接入等系統(tǒng)，支持高速移動、滿足多種業(yè)務(wù)需求并實現(xiàn)全IP架構(gòu)，真正滿足任何人在任何時間、任何地點以任何方式進行通信。但隨著用戶數(shù)量和業(yè)務(wù)類型的不斷增多，無線資源管理面臨著更大的挑戰(zhàn)。因此，研究先進的分組調(diào)度算法是提高數(shù)據(jù)業(yè)務(wù)吞吐量，保證用戶間的公平性，滿足業(yè)務(wù)QoS的根本。 LTE無線網(wǎng)絡(luò)提供給終端用戶的帶寬是受限制的，為了滿足用戶日益增長的需求，通信運營商和設(shè)備制造商亟需有效規(guī)劃和合理利用有限的無線系統(tǒng)資源。不論傳輸技術(shù)有多先進，系統(tǒng)帶寬有多大，無線資源調(diào)度的不合理將極大影響用戶的網(wǎng)絡(luò)體驗和通信質(zhì)量。 本文基于系統(tǒng)級仿真平臺LTE-Sim，對LTE無線資源的調(diào)度進行了研究，對調(diào)度算法進行了分析和設(shè)計改進，并對資源調(diào)度做了性能仿真。首先，對LTE系統(tǒng)的研究背景、網(wǎng)絡(luò)結(jié)構(gòu)的演進變化做了介紹，并對協(xié)議棧做了概述。在此基礎(chǔ)上，重點闡述了無線資源管理以及分組調(diào)度策略，，對調(diào)度問題進行了數(shù)學建模討論，并為不同策略的調(diào)度算法進行了分類研究。其次，利用鏈路級仿真接口EESM為系統(tǒng)級仿真提供支持，對系統(tǒng)仿真中的無線傳播、網(wǎng)路拓撲、用戶移動性、協(xié)議棧、數(shù)據(jù)分組這些仿真模型和系統(tǒng)的仿真流程做了闡述。最后，基于M-LWDF提出了一種針對QoS中GBR參數(shù)的改進算法，在仿真平臺中將改進算法和經(jīng)典算法進行了比較、分析，證明了改進算法在吞吐量、公平性、丟包率以及分組時延這些性能指標上有一定的改善。
[Abstract]:In order to maintain a leading position in the wireless broadband access market, 3GPP needs to overcome the challenges from wireless broadband access technologies such as WiMAX,WiFi. Therefore, 3GPP proposed a long-term evolution plan, LTE.. With the trend of broadband, mobile and IP in mobile communication network, LTE will bring together cellular mobile communication, fixed broadband wireless access, mobile broadband wireless access and other systems, support high-speed mobile, meet a variety of business needs and implement the full IP architecture, and truly meet the communication of anyone at any time and anywhere in any way. However, with the increasing number of users and service types, wireless resource management is facing greater challenges. Therefore, the research of advanced packet scheduling algorithm is to improve the throughput of data services, ensure the fairness among users, and meet the root of service QoS. The bandwidth provided by LTE wireless network to end users is limited. in order to meet the growing needs of users, communication operators and equipment manufacturers need to effectively plan and make rational use of limited wireless system resources. No matter how advanced the transmission technology is and how large the bandwidth of the system is, the unreasonable scheduling of wireless resources will greatly affect the network experience and communication quality of users. In this paper, the scheduling of LTE wireless resources is studied based on the system-level simulation platform LTE-Sim, the scheduling algorithm is analyzed and improved, and the performance of resource scheduling is simulated. Firstly, the research background of LTE system and the evolution and change of network structure are introduced, and the protocol stack is summarized. On this basis, the wireless resource management and packet scheduling strategy are described in detail, the mathematical modeling and discussion of scheduling problem are carried out, and the scheduling algorithms of different strategies are classified and studied. Secondly, the link level simulation interface EESM is used to support the system level simulation, and the simulation models of wireless propagation, network topology, user mobility, protocol stack and data packet in system simulation are described. Finally, an improved algorithm for GBR parameters in QoS is proposed based on M-LWDF. The improved algorithm is compared with the classical algorithm in the simulation platform, and it is proved that the improved algorithm has some improvements in throughput, fairness, packet loss rate and packet delay.
【學位授予單位】：南昌航空大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN929.5

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