保证混合业务质量的跨层OFDMA资源分配方法

提出了一种新的跨层正交频分多址（OFDMA）系统资源分配方法，其综合考虑了无线信道的时变特征和媒体接入子层（MAC）业务质量（QoS）要求，将MAC层分组调度和物理层的OFDM子信道分配及自适应调制编码进行联合设计，目的是在保证实时时延敏感业务和非实时业务的QoS基础上最大化系统吞吐量。在子载波分配过程中，分别采用了信道依赖的最早预期 (CD-EDD)算法和 最小速率需求(MRR)算法，对实时时延敏感业务和非实时业务进行调度。基于IEEE 802.16标准建立了动态仿真模型对算法性能进行评估，结果表明较传统的最大信噪比方法在系统吞吐量相近的基础上对时延特性、用户公平性方面有较大性能提升。

Cross-Layer Radio Resource Allocation with Guaranteed Diverse QoS in OFDMA System

A cross-layer radio resource allocation scheme is proposed with guaranteed divers quality of service(QoS) for multi-user orthogonal frequency division multiplex(OFDM) system.In order to maximize the system throughput under satisfying the QoS requirement of real-time and non-real-time services,packet scheduling,subchannel allocation and adaptive modulation and coding(AMC)schemes are jointly designed.The channel dependent earliest due date(CD-EDD) and minimum rate request(MRR) disciplines are employed for the resource allocation for real-time and non-real-time services respectively.The performance of the proposed algorithm is evaluated on the IEEE 802.16 standard-based dynamical system-level simulation.The results reveal that the proposed algorithm can perform better than maximum signal noise ratio strategy in terms of average packet delay and user fairness with the near throughput.