LTE-A中继系统中资源分配和吞吐量的研究
发布时间：2018-08-25 07:20
【摘要】：移动通信行业是世界范围内用户数量增长最快的行业,移动通信系统经过了2G、3G和4G的演进,即将迎来更快、更密、更智能的5G时代。在这不断演进的过程中,紧紧跟随的是移动通信技术的不断提升和更新,其中就包括一项非常重要的技术——LTE-A标准引入的中继技术。要满足人们随时随地的上网需求,中继是不可或缺的。中继是一种具有低成本、易部署、改善覆盖、提高容量等特点的无线通讯设备。但是中继的加入对原有的蜂窝直传用户产生了干扰,破坏了蜂窝系统的公平性。为了解决此问题,现存的大部分方案都是直接让中继用户使用的资源块与蜂窝直传用户使用的资源块正交,这些方案虽然能够避免干扰的产生,但是带来了频谱效率低下的缺陷。在保证直传用户和中继用户QoS需求的基础之上,为了增加频谱效率,提高系统吞吐量,并且保障蜂窝系统具有好的公平性,本文提出了两种基于PF调度的新资源分配方案:NPF和NRA。第一种NPF资源分配方案,基本思想是将回程链路和接入链路捆绑为一个虚拟用户,直传链路作为一个虚拟用户。首先在一个调度帧内,所有虚拟用户采用PF调度进行资源分配,保证蜂窝系统具有好的公平性;然后再进一步给回程链路和接入链路分别在两个时隙内分配资源,使得整个系统吞吐量最大。第二种NRA资源分配方案,基本思想是中继用户接入链路使用的资源块和蜂窝系统直传用户使用的资源块非正交共享。首先在第二时隙,给每一条中继用户接入链路选出最佳的直传用户来共享资源块,保证蜂窝系统公平性破坏最小;然后在第一时隙,先给回程链路分配资源块,再将剩余的资源块分配给直传链路,使得整个系统吞吐量最大。仿真结果表明:与传统的PF调度中继方案相比,这两种方案都减小了中继用户对原有直传用户的干扰,改善了整个蜂窝系统的公平性及吞吐量,增加了频谱效率。
[Abstract]:The mobile communication industry is the fastest growing industry in the world. With the evolution of 3G and 4G, the mobile communication system is approaching a faster, denser and more intelligent 5G era. In the process of continuous evolution, it is closely followed by the continuous upgrading and updating of mobile communication technology, including a very important technology, the relay technology introduced by LTE-A standard. To meet the needs of people anytime, anywhere online, relay is indispensable. Relay is a low-cost, easy-to-deploy, improved coverage, increased capacity and other characteristics of wireless communication equipment. However, the addition of relay interferes with the original cellular direct transmission users and destroys the fairness of cellular systems. In order to solve this problem, most of the existing schemes are directly orthogonal between the resource blocks used by relay users and those used by cellular direct users, although these schemes can avoid interference. But it brings about the defect of inefficient spectrum. In order to increase spectrum efficiency, improve system throughput and ensure good fairness of cellular system, two new resource allocation schemes based on PF scheduling, namely: NPF and NRA., are proposed in this paper, on the basis of guaranteeing the QoS requirements of direct users and relay users. The basic idea of the first NPF resource allocation scheme is to bind the backhaul link and the access link into a virtual user and the direct link as a virtual user. First of all, in a scheduling frame, all virtual users allocate resources using PF scheduling to ensure that the cellular system has good fairness. Then, the backhaul link and the access link are allocated resources in two time slots respectively. Make the whole system throughput maximum. The basic idea of the second NRA resource allocation scheme is that the resource block used by the relay user access link and the resource block used by the direct transmission user in the cellular system are not orthogonal shared. First, in the second time slot, the best direct users are selected for each relay user access link to share the resource block, so as to ensure the minimum damage to the fairness of the cellular system; then, in the first time slot, the return link is first allocated a resource block. Then the remaining resource blocks are allocated to the direct link to maximize the throughput of the whole system. The simulation results show that compared with the traditional PF scheduling relay scheme, both schemes reduce the interference of relay users to the original direct users, improve the fairness and throughput of the whole cellular system, and increase the spectral efficiency.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.5
本文编号：2202152
[Abstract]:The mobile communication industry is the fastest growing industry in the world. With the evolution of 3G and 4G, the mobile communication system is approaching a faster, denser and more intelligent 5G era. In the process of continuous evolution, it is closely followed by the continuous upgrading and updating of mobile communication technology, including a very important technology, the relay technology introduced by LTE-A standard. To meet the needs of people anytime, anywhere online, relay is indispensable. Relay is a low-cost, easy-to-deploy, improved coverage, increased capacity and other characteristics of wireless communication equipment. However, the addition of relay interferes with the original cellular direct transmission users and destroys the fairness of cellular systems. In order to solve this problem, most of the existing schemes are directly orthogonal between the resource blocks used by relay users and those used by cellular direct users, although these schemes can avoid interference. But it brings about the defect of inefficient spectrum. In order to increase spectrum efficiency, improve system throughput and ensure good fairness of cellular system, two new resource allocation schemes based on PF scheduling, namely: NPF and NRA., are proposed in this paper, on the basis of guaranteeing the QoS requirements of direct users and relay users. The basic idea of the first NPF resource allocation scheme is to bind the backhaul link and the access link into a virtual user and the direct link as a virtual user. First of all, in a scheduling frame, all virtual users allocate resources using PF scheduling to ensure that the cellular system has good fairness. Then, the backhaul link and the access link are allocated resources in two time slots respectively. Make the whole system throughput maximum. The basic idea of the second NRA resource allocation scheme is that the resource block used by the relay user access link and the resource block used by the direct transmission user in the cellular system are not orthogonal shared. First, in the second time slot, the best direct users are selected for each relay user access link to share the resource block, so as to ensure the minimum damage to the fairness of the cellular system; then, in the first time slot, the return link is first allocated a resource block. Then the remaining resource blocks are allocated to the direct link to maximize the throughput of the whole system. The simulation results show that compared with the traditional PF scheduling relay scheme, both schemes reduce the interference of relay users to the original direct users, improve the fairness and throughput of the whole cellular system, and increase the spectral efficiency.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.5
【参考文献】
相关期刊论文 前2条
1 李国华;;中继技术在未来移动网络中的应用分析[J];移动通信;2016年10期
2 王斌;付茂豹;王文鼐;;基于实时业务挤占的OFDMA系统的无线资源分配方案[J];电子与信息学报;2012年08期
相关博士学位论文 前2条
1 苗婷莛;高效率中继技术的研究[D];北京邮电大学;2015年
2 李根;无线中继通信系统的容量优化技术研究[D];北京邮电大学;2012年
相关硕士学位论文 前3条
1 崔玲龙;蜂窝多跳传输场景的中继选择技术研究[D];北京邮电大学;2014年
2 刘圣洁;LTE系统的干扰协调调度技术的研究与实现[D];南京邮电大学;2013年
3 郑建涛;基于MATLAB的LTE系统级仿真研究[D];北京邮电大学;2013年
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