北京航空航天大学学报 ›› 2014, Vol. 40 ›› Issue (10): 1451-1456.doi: 10.13700/j.bh.1001-5965.2013.0616

• 论文 • 上一篇    下一篇

应用于MIMO-OFDMA下行链路的分组调度算法

刘壮, 李曦, 纪红   

  1. 北京邮电大学 泛网无线通信教育部重点实验室, 北京 100876
  • 收稿日期:2013-10-30 出版日期:2014-10-20 发布日期:2014-10-29
  • 作者简介:刘壮(1989-),男,陕西榆林人,硕士生,liuzhuang0823@163.com.
  • 基金资助:

    北京高等学校青年英才计划资助项目(YETP0432);国家863计划资助项目(2012AA01A508);国家青年科学基金资助项目(61302080)

Packet scheduling algorithm for multi-service MIMO-OFDMA downlink systems

Liu Zhuang, Li Xi, Ji Hong   

  1. Key Laboratory of Universal Wireless Communications, Ministry of Education, Beijing University of Posts and Telecommunications, Beijing 100876, China
  • Received:2013-10-30 Online:2014-10-20 Published:2014-10-29

摘要:

提出了一种基于效用函数的应用于多输入多输出正交频分复用接入 (MIMO-OFDMA, Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing Access )系统下行链路的分组调度算法.该算法在调度时不仅考虑物理层的信道状况,还利用基站发送缓冲区的状态信息和用户反馈回来的ARQ(Automatic Repeat-request)信息来帮助基站做出调度决策.针对系统中多种业务的不同服务质量(QoS,Quality of Service)要求,分别设计了其效用函数,并将调度决策问题转化成一个系统总效用函数值最大化问题.同时考虑到实际的长期演进计划(LTE,Long Term Evolution) 系统中对子载波共享的限制条件,提出了一种可以降低实际复杂度的启发式算法用于求解该最优化问题.仿真结果表明,该算法不但在保证实时业务用户QoS要求方面要好于传统的调度算法,还能获得较好的系统总容量和丢包率性能.

关键词: 多输入多输出, 正交频分多址, 分组调度, 反馈时延, 效用函数

Abstract:

A utility-based packet scheduling algorithm was proposed for downlink multiuser multiple input multiple output-orthogonal frequency division multiplexing access (MIMO-OFDMA) systems. The proposed algorithm not only considered the channel condition of physical layer, but also utilized the transmitting buffer status information and the automatic repeat-request (ARQ) feedback information to help improve the system performance. In order to satisfy the different qualities of service (QoS) of multi-service, different utility functions were designed for different traffics and then the scheduling problem was formulated into a problem of overall system utility maximization. Moreover, considered the limits of practical long term evolution (LTE), a heuristic algorithm with low computational complexity was proposed. The simulation results show that the proposed algorithm outperforms the existing algorithms in terms of the system throughput and the packet loss rate and can also guarantee the QoS demand of real-time traffic.

Key words: multiple input multiple output(MIMO), orthogonal frequency division multiplexing(OFDM), packet scheduling, feedback delay, utility function

中图分类号: 


版权所有 © 《北京航空航天大学学报》编辑部
通讯地址:北京市海淀区学院路37号 北京航空航天大学学报编辑部 邮编:100191 E-mail:jbuaa@buaa.edu.cn
本系统由北京玛格泰克科技发展有限公司设计开发