联合AMC,ARQ与包分割的通信系统队列分析与跨层优化  

Queue analysis and cross-layer optimization for systems combining AMC,ARQ and packet fragmentation

作　　者：左勇[1] 潘科[1] 刘学勇[1] 陈杰[1] 

机构地区：[1]中国科学院微电子研究所通信与多媒体SoC研究室,北京100029

出　　处：《系统工程与电子技术》2011年第11期2522-2530,共9页Systems Engineering and Electronics

基　　金：国家重点基础研究发展计划(973计划)(2009CB320300)资助课题

摘　　要：针对联合自适应调制编码(adaptive modulation and coding,AMC),自动重传请求(automatic repeatrequest,ARQ)与包分割传输3种机制的通信系统,提出了一种ARQ多帧动态周期反馈机制,并建立了分析此系统的马尔可夫链模型,得到了包平均时延、平均反馈次数、平均掉包率和系统吞吐量等多种性能指标。在此基础上提出了在服务质量(quality of service,QoS)条件约束下,以最大化系统有效吞吐量为目标的双向链路跨层最优化算法。仿真结果表明,提出的马尔可夫链模型能精确预测系统的性能,与现有的单帧反馈和多帧固定周期反馈相比,提出反馈机制可达到更大的系统有效吞吐量。Aiming at the wireless systems employing adaptive modulation and coding （AMC）, automatic repeat request （ARQ） and packet fragmentation transmission, a novel ARQ feedback scheme is proposed. The queue behavior induced by the scheme is analyzed with a Markov chain model. Analytical expressions for performance metric such as average packet delay, ARQ feedback amount, packet drop rate and throughput are derived. A constrained bidirectional link optimization problem is solved numerically to maximize the overall sys- tem throughput under the specified QoS constraints. Simulation results show that the proposed Markov chain model can accurately predict the performance of tangible systems. The effective throughput achieved by emplo- ying the proposed ARQ feedback scheme is larger than that achieved by employing the single-and multi-frame feedback schemes.

关 键 词：通信技术 马尔可夫链 自适应调制编码 自动重传请求 包分割 

分 类 号：TN914.3[电子电信—通信与信息系统]