Joint user association and resource allocation for cost-efficient NOMA-enabled F-RANs  

作　　者：Yuan Ai Chenxi Liu Mugen Peng 

机构地区：[1]Faculty of Information Technology,Beijing University of Technology,Beijing 100124,China [2]SchoolofInformation and Communication Enginering,Beijing University of Posts and Telecommunications,Beijing 100876,China

出　　处：《Digital Communications and Networks》2024年第6期1686-1697,共12页数字通信与网络(英文版)

基　　金：supported in part by National Key R&D Program of China(2020YFB1808100);in part by National Natural Science Foundation of China under No.62001047;in part by the Beijing Municipal Science and Technology Project No.Z211100004421017;in part by Zhejiang Lab under Grant 2021KF0AB03。

摘　　要：Integrating Non-Orthogonal Multiple Access(NOMA)into Fog Radio Access Networks(F-RANs)has shown to be effective in boosting the spectral efficiency,energy efficiency,connectivity,and reducing the latency,thus attracting significant research attention.However,the performance improvement of the NOMA-enabled F-RANs is at the cost of computational overheads,which are commonly neglected in their design and deployment.To address this issue,in this paper,we propose a hybrid dynamic downlink framework for NOMA-enabled F-RANs.In this framework,we first develop a novel network utility function,which takes both the network throughput and computational overheads into consideration,thus enabling us to comprehensively evaluate the performance of different access schemes for F-RANs.Based on the developed network utility function,we further formulate a network utility maximization problem,subject to practical constraints on the decoding order,power allocation,and quality-of-service.To solve this NP-hard problem,we decompose it into two subproblems,namely,a user equipment association and subchannel assignment subproblem and a power allocation subproblem.Threedimensional matching and sequential convex programming-based algorithms are designed to solve these two subproblems,respectively.Through numerical results,we show how our proposed algorithms can achieve a good balance between the network throughput and computational overheads by judiciously adjusting the maximum transmit power of fog access points.We also show that the proposed NOMA-enabled F-RAN framework can increase,by up to 89%,the network utility,compared to OMA-based F-RANs.

关 键 词：Non-orthogonal multiple access(NOMA) Resource allocation Fog radio access networks 

分 类 号：TN929.5[电子电信—通信与信息系统]