基于移动边缘计算的NOMA异构网络资源分配  

Resource allocation in NOMA heterogeneous network based on MEC

作　　者：张海君 张资政 隆克平[1] ZHANG Haijun;ZHANG Zizheng;LONG Keping(School of Computer&Communication Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学计算机与通信工程学院,北京100083

出　　处：《通信学报》2020年第4期27-33,共7页Journal on Communications

基　　金：国家优秀青年科学基金资助项目(No.61822104);国家自然科学基金资助项目(No.61771044)。

摘　　要：以最大化缓存收益为目标,针对部署缓存的NOMA异构网络下的基站用户匹配及功率分配问题,结合消息传递及DC规划提出了NOMA联合优化算法。首先将约束条件合并到目标函数中,通过计算新的优化问题中函数节点与变量节点间消息传递的边缘得到用户协同结果;然后将原优化问题变形为2个凸函数差的形式,通过DC规划对功率资源进行分配;最后迭代计算得到最终的用户协同及功率分配结果。仿真结果证明所提算法有效地提升了网络性能。Aiming at maximizing the cache revenue,a joint user association and power allocation algorithm was proposed for the matching of base stations with users and power allocation in a NOMA heterogeneous network with caches,a NOMA joint optimization algorithm which was achieved by combing with message passing and DC programming was proposed.First,the constraints were incorporated into the objective function,and the user association result was obtained by calculating the marginal of the message passing between the function node and the variable node in the new optimization problem.Then,the original optimization problem was transformed into the form of the difference between two convex functions,and allocate power resources through DC programming.Finally,the final user association and power allocation results are obtained through iterative calculations.Simulation results prove that the proposed algorithm effectively improves network performance.

关 键 词：移动边缘计算 非正交多址接入 异构网络 用户协同 功率分配 

分 类 号：TN92[电子电信—通信与信息系统]