摘要
跨层设计是目前比较流行的、有效的无线系统设计方法。本文针对多业务(实时业务和非实时业务)正交频分复用(OFDM)系统,提出了一种跨层结构的动态资源分配算法。该算法不仅在物理层上考虑信道状态信息和功率限制条件,而且在MAC层上针对不同类型业务采取不同的调度策略:(1)对于高优先级的实时业务,采用最大化容量的OFDMA策略,在频域上最大限度地利用多用户分集提高频谱效率,在时域上通过时隙的分配来保证时延边界;(2)对于低优先级的非实时业务,在频域上采用基于比例公平的OFDMA策略,在时域上尽力而为地分配时隙。仿真结果表明,与传统的单层资源分配算法相比,所提算法能够在保证不同业务服务质量(QoS)的前提下,大幅度地提高系统性能。
Cross-layer design is a promising and effective technique for future mobile communication systems. In this paper, we propose a Diff-Service based cross-layer dynamic resource allocation algorithm for Orthogonal Frequency Division Multiplexing （OFDM） systems, dividing the services into real-time services and non-real-time services. The proposed algorithm takes into consideration not only the channel state information and power limitation in the physical layer, but also diverse traffic scheduling for different services in the MAC layer. The real-time services take on capacity-maximized OFDMA method with high priority, which can improve the spectral efficiency and guarantee the delay bound with enough time slots. For non-real-time-service, it is assigned with the rest of the frame by proportional fairness method. The proposed algorithm is shown to improve system performance significantly with QoS guarantees compared to traditional single-layer resource allocation algorithm by extensive simulations.
出处
《电路与系统学报》
CSCD
北大核心
2008年第5期98-102,共5页
Journal of Circuits and Systems
基金
自然科学基金资助项目(60572148)
华为基金资助项目(YJCB2004002WL)
西安电子科技大学研究生院创新基金课题资助(创05014)
国家自然科学基金资助项目(60702060)
关键词
正交频分复用OFDM
动态资源分配
跨层
区分业务
Orthogonal Frequency Division Multiplexing （OFDM）
dynamic resource allocation
cross-layer
Dill-Service
