无线网络下行链路时延和功率的最优控制  

Optimal control of the delay and power in the downlink of wireless network

作　　者：彭烈新[1] 朱光喜[1] 孙俊[1] 王海龙[2] 

机构地区：[1]华中科技大学电子与信息工程系 [2]大港石油管理局测试公司,天津300280

出　　处：《华中科技大学学报（自然科学版）》2008年第5期35-38,共4页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(60496315);国家高技术研究发展计划资助项目(2003AA12331005)

摘　　要：研究无线网络下行链路中平均功率约束下联合跨层多用户平均时延最小化问题.基站根据不同用户的信道增益和队列长度信息,动态调整发射功率和速率,以实现系统平均时延最小化.将该优化问题转化为非约束马尔可夫动态决策过程,证明了在最优策略下系统平均时延和功率具有凸关系,仿真结果表明这种关系成立.考虑到原优化问题的特性和求解的复杂度,进而将该优化问题转化为凸优化问题,并给出了实际的求解算法和仿真结果.In order to minimize average delay of wireless network in the downlink environment under average power constraint, base station allocates transmission rate and power to individual users depending upon the buffer lengths and the channel of each user. We first formulate it as a constrained Markov decision process （MDP） and then convert it to an unconstrained one. Next the convexity property of the power-delay function of the optimal control strategy is given and verified by simulating results. Considering the huge complexity and the characteristic of the problem, we further transform it to a convex optimization problem and a practical algorithm is presented.

关 键 词：无线网络 时延 功率 资源分配 马尔可夫决策过程 凸优化 下行链路 

分 类 号：TN925.93[电子电信—通信与信息系统]