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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.
This paper proposes a packet scheduling algorithm based on utility function applied to the downlink of MIMO-OFDMA (Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing Access) system. The scheduling not only considers the channel status of the physical layer, but also uses the status information of the buffer sent by the base station and the ARQ (Automatic Repeat-request) information fed back by the user to help the base station make scheduling decisions.Aiming at the different quality of service (QoS, Quality of Service) requirements, the utility function is designed and the scheduling decision problem is transformed into a system maximum utility function value maximization problem.At the same time, considering the actual Long Term Evolution (LTE) system For the limitation of subcarrier sharing, a heuristic algorithm that can reduce the practical complexity is proposed to solve the optimization problem.The simulation results show that this algorithm not only guarantees QoS requirements of real-time business users better than traditional scheduling algorithms , But also get better system total capacity and packet loss rate performance.