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1、 LTE-A 中基于中基于 QoS 的调度算法的研究的调度算法的研究 Scheduling Algorithm Research Based on QoS in LTE-Advanced 专 业: 电磁场与微波技术 作者姓名: 李园园 指导教师: 金杰 教授 天津大学电子信息工程学院 二零一四 年 十二 月 独创性声明 本人声明所呈交的学位论文是本人在导师指导下进行的研究工作和取得的研究成果,除了文中特别加以标注和致谢之处外,论文中不包含其他人已经发表或撰写过的研究成果, 也不包含为获得 天津大学天津大学 或其他教育机构的学位或证书而使用过的材料。 与我一同工作的同志对本研究所做的任何贡献均已
2、在论文中作了明确的说明并表示了谢意。 学位论文作者签名: 签字日期: 年 月 日 学位论文版权使用授权书 本学位论文作者完全了解 天津大学天津大学 有关保留、使用学位论文的规定。特授权 天津大学天津大学 可以将学位论文的全部或部分内容编入有关数据库进行检索,并采用影印、缩印或扫描等复制手段保存、汇编以供查阅和借阅。同意学校向国家有关部门或机构送交论文的复印件和磁盘。 (保密的学位论文在解密后适用本授权说明) 学位论文作者签名: 导师签名: 签字日期: 年 月 日 签字日期: 年 月 日 摘摘 要要 为了应对移动通信市场挑战,满足多用户对新型业务的更高 QoS 需求,涵盖全球各大企业及运营商的
3、3GPP 组织提出了 LTE 项目的进一步演进LTE-Advanced。提高多用户之间传输数据的公平性、改善小区整体的吞吐量和边缘用户业务体验是人们一直以来的追求, 而有效的资源分配方案及数据传输方案正是实现这一目标的关键所在。本文正是以 LTE-A 系统架构及新技术为背景,展开基于 QoS 的资源调度算法和绑定传输的研究。 论文详细介绍 LTE-A 系统的发展历程、网络部署覆盖现状、更高的系统需求及增强的关键技术,重点研究基站侧 MAC 层的调度功能和用户侧边缘用户的数据传输,与现有调度算法相结合,使得在资源有限的条件下,能够更好的满足业务 QoS 需求和改善系统性能。论文的主要研究内容和成
4、果分为以下两个方面: 第一, 针对小区边缘用户上行覆盖受限等问题提出了一种可以减小业务延迟的改进 TTI Bundling 方案。在单一 HARQ 传输、RLC SDU 分段传输和传统 TTI绑定传输三种方案的基础上,将绑定 UE 的小数据包或高质量传输考虑在内,以解码最少数量 RV 进行 ACK 反馈为原则,尽可能早地通知该 UE 的上行数据包被正确接收。本方案可以大大减少不必要的 RV 等待时间,从而降低 TD-LTE 系统的业务传输延迟,提高频谱利用率和系统吞吐量。 第二,为了改善小区整体的吞吐量和提高多用户之间传输数据的公平性,提出了一种 LTE-A 系统下行基于调度度量值的资源分配方
5、案。该方案打破了传统资源分配过程中顺序分配资源的束缚,将用户与物理资源块配对,优先把服务质量最好的 RB 资源分配给相应的用户, 尽量保证用户在各自有利的信道上传输数据。仿真结果表明,该方案在不增大丢包率的前提下,有效地提高了系统的吞吐量和公平性,对 LTE-A 下行链路是一个很好的选择。 关键字:关键字:LTE-Advanced 资源分配 TTI 绑定 吞吐量 公平质量 ABSTRACT In order to cope with the challenges of mobile communication market, meet multi-users higher demand for
6、 QoS with the new business, the 3GPP organization which covering the worlds major enterprises and operators put forward the further evolution of the LTE projectLTE-Advanced. It has been the pursuit of people to improve the fairness of data transmission between multiple users , the throughput of the
7、whole cell and edge users service experience .While the resource allocation scheme and effective data transmission scheme is the key to achieve this goal .This paper which based on the LTE-A system architecture and new technology as the background, studies the QoS resource scheduling algorithm and b
8、inding transmission. The paper introduces in detail the development process of LTE-A system, the status of network deployment covering, higher system requirements and key technology of enhancement, focusing on the MAC layers scheduling function of the base station side and edge users data transmissi
9、on function of the user side. combining with the existing scheduling algorithms , meet the demand of the business performance of QoS and improve the system performance in the conditions of limited resources. The main research contents and results of the paper are divided into the following two aspec
10、ts: First, cell edge users uplink coverage is limited and aim at the problem this paper put forward a kind of improved TTI Bundling scheme to reduce the service delay. Based on the three schemes of single HARQ transmission, RLC SDU segment transmission and traditional TTI binding transmission ,take
11、the small data packets which binding the UE or high-quality transmission into account, in the principle of decoding the minimum number of RV and processing ACK feedback , to inform the UE uplink data packet being received correctly as early as possible .This scheme can greatly reduce unnecessary RV
12、waiting time, thereby reducing the service transmission delay of the TD-LTE system, and improve the spectrum utilization and system throughput. Second, in order to improve the overall throughput and the fairness of data transmission between multi users in the district, this paper brings forward a sc
13、heme of LTE-A system downlink resource allocation based on the scheduling metric value. The scheme break the shackles of traditional sequential resource allocation in the resource allocation processing, matching the user and physical resource block , and allocating the RB resources which provide the
14、 best service quality to the corresponding user priority, to ensure that the users transmit data in their respective favorable channel as far as possible. Simulation results show that the scheme can effectively improve the system throughput and fairness in the condition of not increasing the packet loss rate, and it is a good choice for LTE-A downlink. Key words: LTE-Advanced, Resource allocation, TTI bundling, Throughput, Fairness, Quality of service 目 录 第一章 绪论 . 1 1.1 课题背景与研究意义 . 1 1.2 国内外研究现状 . 2 1.3 论文主要研究内容及章节安排 . 3 第二章 LTE-Ad