异构网络中高能效动态流量卸载

摘要

The dynamic traffic offloading is studied for achieving high energy efficiency in heterogeneous networks.Considering the impacts of mobile users and dynamic service requests,the dynamic programming theory is applied to model and investigate traffic offloading process.The traffic offloading is modeled as a multistage decision process.The target for achieving the maxi-mum system energy efficiency is transferred to find the optimum utility of corresponding multistage decision.In addition,a dy-namic traffic offloading algorithm is designed to improve the system energy efficiency,based on delay tolerant traffic offloading method and dynamic programming module.The simulation results show that proposed method presents better performance on system energy efficiency than existed algorithms.%研究了异构网络中，以优化系统能效为设计目标的动态流量卸载。综合考虑了用户移动性和业务动态性的影响，利用动态规划理论对异构网络中的流量卸载问题进行了建模分析，将系统能效在连续时间上的优化问题转化成多阶段决策的最优化问题。在此基础上，基于延时流量卸载的思想，利用动态规划的分析模型，提出了一种系统能效优先的动态流量卸载算法。仿真结果表明，与已有的流量卸载算法相比，提出的动态流量卸载算法能有效地提升系统的能量效率。