Optimal downlink multi-user MIMO cross-layer scheduling using HOL packet waiting time
Optimal downlink multi-user MIMO cross-layer scheduling using HOL packet waiting time
复制标题
利用HOL分组等待时间优化下行多用户MIMO跨层调度
DOI：
10.1109/twc.2006.04613
复制
发表时间：
2006
影响因子：
10.4
通讯作者：
R. Murch
中科院分区：
文献类型：
--
作者：
Cheng Wang;R. Murch
跨层设计是实现无线系统性能提升的一种很有前途的技术。本文研究了多输入多输出(MIMO)无线系统在物理层工作时，物理层和MAC层之间的协同作用。提出了两种最优下行多用户MIMO调度算法，在进行调度决策时同时考虑了来自MAC层的排队状态信息和来自物理层的信道状态信息。我们的方法是最优的，因为它们可以在保证系统稳定性的同时实现最大系统吞吐量。也就是说，只要其他调度算法可行，它们就能保证系统的稳定性。计算机模拟表明，与传统的严格分层设计相比，我们的跨层设计获得了显著的增益。此外，通过利用HOL(队头)分组等待时间，我们的优化调度算法可以为非均匀业务提供更均衡的时延性能，而现有的最优调度算法没有考虑这一点
Cross-layer design is a promising technique to achieve performance enhancement for wireless systems. In this paper, we seek to exploit the synergy between the PHY (physical) layer and the MAC (multiple access control) layer when a multiple-input multiple-output (MIMO) wireless system is operating at the PHY layer. We propose two optimal downlink multi-user MIMO scheduling algorithms which consider both the queueing state information from the MAC layer and the channel state information from the PHY layer when making scheduling decision. Our approaches are optimal in the sense that they can achieve maximum system throughput while at the same time guaranteeing the stability of the system. That is, they guarantee stability of the system whenever it is feasible with any other scheduling algorithm. Computer simulations demonstrate that significant gains are achieved by our cross-layer design compared to traditional strict-layered designs. Additionally, by making use of the HOL (head of line) packet waiting time our optimal scheduling algorithms can provide a more balanced delay performance for non-uniform traffic compared to the existing optimal scheduling algorithm which does not consider it