LTE系统下基于MBMS无线资源调度研究

发布时间：2018-03-09 02:23

本文选题：LTE　切入点：MBMS　出处：《南京邮电大学》2014年硕士论文　论文类型：学位论文

【摘要】：长期演进(LTE)计划于2004年由3GPP标准组织启动,作为未来无线移动通信的发展方向。为了满足日益增长的数据需求,LTE提出了MBMS技术,MBMS实现了从数据源向特定范围内多个用户同时传送数据,以较少的资源为大量具有相同需求的用户同时提供服务,从而达到资源共享。在MBMS业务下,无线资源如何分配的问题随之而来,主要有：多播组内传输速率如何选择问题,无线资源块与多播组如何合理调度问题,多播组内各用户以及多播组之间的公平性问题,这使得多播业务的调度越来越有挑战性。本文主要对LTE系统下MBMS业务的无线资源调度做了相关的研究,并从系统级仿真的角度对调度算法进行了分析和比较。MBMS需要上行反馈信道状况,因此性能受限于最差用户的信道质量。本文提出了两种LTE系统下基于MBMS传输的多媒体流频域分组调度方案——TLSMS方案和TLSMS-BOE方案,这两种方案在多播调度的基础上加入了流分层思想,将多媒体流分为基层和扩展层,在点对多点的传输方式下,根据信道质量反馈针对不同流层采用不同的调度方法,在保证用户间较高的公平性的同时增加了系统吞吐量。TLSMS方案先为每个多播组分别分配一个RB块用于基层传输,再为每个多播组分别分配一个RB块进行扩展层传输服务,最后将剩余的RB块逐个分配给已获吞吐量最少的多播组用作扩展层传输服务。TLSMS-BOE方案则是从逆向考虑,先为每个多播组分配扩展层传输,再用各自的基层传输去挤占扩展层传输,为每个多播组分配一个资源块用于基层传输,挤占的规则是使减少的吞吐量最小。理论和仿真分析表明,与已有的传统调度方案相比,在系统吞吐量,调度公平性,丢包率,频谱效率这四个性能方面,T LSMS方案和TLSMS-BOE方案表现的更好,而这两种方案之间相比也各有优缺点,TLSMS方案具有更好的公平性,TSMS-BOE方案具有更好的系统吞吐量和用户频谱效率。在实际应用中,这两种方案都具有一定的可行性和可操作性。
[Abstract]:LTE) is scheduled to be launched by the 3GPP Standards Organization in 2004. As the development direction of wireless mobile communication in the future, in order to meet the increasing demand of data, MBMS technology is proposed to realize the simultaneous transmission of data from data sources to multiple users within a specific range. In MBMS service, the problem of how to allocate wireless resources comes with the following problems: how to select the transmission rate in multicast group, and how to select the transmission rate in multicast group. How to schedule the radio resource block and multicast group reasonably, and the fairness problem between users and multicast group in multicast group. This makes the scheduling of multicast services more and more challenging. This paper mainly studies the wireless resource scheduling of MBMS services in LTE system. From the point of view of system-level simulation, the scheduling algorithm is analyzed and compared. Therefore, the performance is limited by the channel quality of the worst users. In this paper, we propose two kinds of multimedia stream frequency domain packet scheduling schemes based on MBMS transmission in LTE system, which are TLSMS scheme and TLSMS-BOE scheme. These two schemes add stream stratification idea to the multicast scheduling. The multimedia stream is divided into basic layer and extension layer. Under point-to-multipoint transmission mode, different scheduling methods are adopted for different stream layers according to channel quality feedback. At the same time, it increases the system throughput. TLSMS scheme assigns a RB block to each multicast group for basic transmission, and then allocates one RB block for each multicast group to carry on the extended layer transmission service. Finally, the remaining RB block is allocated to the multicast group with the least throughput one by one as the extension layer transport service. TLSMS-BOE scheme is considered from the reverse perspective. First, each multicast group is assigned the extension layer transmission, and then the extension layer transmission is eliminated by their respective primary transmission. A resource block is allocated to each multicast group for basic transmission. The rule of congestion is to minimize the reduced throughput. Theoretical and simulation analysis show that, compared with the traditional scheduling schemes, the system throughput, scheduling fairness, packet loss rate, The T LSMS scheme and the TLSMS-BOE scheme perform better in these four aspects of spectrum efficiency. The TSMS-BOE scheme has better system throughput and user spectrum efficiency than the TSMS-BOE scheme. In practical application, the two schemes are feasible and operable.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5

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