基于系统级仿真的LTE资源调度研究

发布时间：2019-07-09 17:01

【摘要】：为了保持在无线宽带接入市场的领先地位，3GPP需要克服来自WiMAX、WiFi等无线宽带接入技术的挑战。因此，3GPP提出了长期演进计划LTE。伴随着移动通信网络呈现出宽带化、移动化以及IP化的趋势，LTE将汇集蜂窝移动通信、固定宽带无线接入、移动宽带无线接入等系统，支持高速移动、满足多种业务需求并实现全IP架构，真正满足任何人在任何时间、任何地点以任何方式进行通信。但随着用户数量和业务类型的不断增多，无线资源管理面临着更大的挑战。因此，研究先进的分组调度算法是提高数据业务吞吐量，保证用户间的公平性，满足业务QoS的根本。 LTE无线网络提供给终端用户的带宽是受限制的，为了满足用户日益增长的需求，通信运营商和设备制造商亟需有效规划和合理利用有限的无线系统资源。不论传输技术有多先进，系统带宽有多大，无线资源调度的不合理将极大影响用户的网络体验和通信质量。本文基于系统级仿真平台LTE-Sim，对LTE无线资源的调度进行了研究，对调度算法进行了分析和设计改进，并对资源调度做了性能仿真。首先，对LTE系统的研究背景、网络结构的演进变化做了介绍，并对协议栈做了概述。在此基础上，重点阐述了无线资源管理以及分组调度策略，，对调度问题进行了数学建模讨论，并为不同策略的调度算法进行了分类研究。其次，利用链路级仿真接口EESM为系统级仿真提供支持，对系统仿真中的无线传播、网路拓扑、用户移动性、协议栈、数据分组这些仿真模型和系统的仿真流程做了阐述。最后，基于M-LWDF提出了一种针对QoS中GBR参数的改进算法，在仿真平台中将改进算法和经典算法进行了比较、分析，证明了改进算法在吞吐量、公平性、丢包率以及分组时延这些性能指标上有一定的改善。
[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.
【学位授予单位】：南昌航空大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5

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