基于非稳态MAB的低地球轨道卫星系统异构用户接入方法  

Non-stationary MAB based access method for heterogeneous users in LEO satellite systems

作　　者：林敏[1] 孙昊 赵柏 郭焱 杨绿溪[2] LIN Min;SUN Hao;ZHAO Bai;GUO Yan;YANG Lyuxi(School of Communications and Information Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210003,China;School of Information Science and Engineering,Southeast University,Nanjing 211189,China)

机构地区：[1]南京邮电大学通信与信息工程学院,江苏南京210003 [2]东南大学信息科学与工程学院,江苏南京211189

出　　处：《通信学报》2025年第3期212-220,共9页Journal on Communications

基　　金：国家自然科学基金资助项目(No.62471255)。

摘　　要：针对吞吐量敏感用户和时延敏感用户同时接入低地球轨道卫星系统的场景,提出了一种基于非稳态多臂赌博机(MAB)的非正交多址接入(NOMA)接入方法,以提高系统的频谱效率和异构用户的接入灵活性。首先,在构建联合效用函数以同时考虑时延敏感用户信息年龄(AoI)和吞吐量敏感用户传输速率需求的基础上,建立以联合效用函数最大化为目标,以速率门限和数据包缓存时间为约束条件的优化问题。由于传统的凸优化方法无法进行求解,在采用波束成形抑制组间干扰的基础上,提出了基于非稳态MAB的动态接入方案,实现异构用户的智能配对与调度,以及可靠接入。最后,计算机仿真验证了所提方法的可靠性和优越性,并进一步分析了折扣因子和数据包缓存门限值对系统性能的影响。Provided that both throughput-sensitive and delay-sensitive users access the low earth orbit(LEO)satellite system simultaneously,a non-orthogonal multiple access(NOMA)access method using non-stationary multi-armed bandit(MAB)was proposed to enhance the system spectral efficiency and access flexibility for the heterogeneous users.Firstly,a utility function was established to jointly consider the age of information(AoI)of delay-sensitive users and the throughput requirements of throughput-sensitive users.Then,an optimization problem was formulated to maximize the joint utility function,while satisfying the constraints of rate thresholds and packet buffering time.Since the traditional convex optimization methods couldn’t solve this problem,by using the beamforming to suppress the inter-group interference,a dynamic access scheme based on the non-stationary MAB was proposed to realize the intelligent pairing,scheduling,and reliable access for the heterogeneous users.Finally,computer simulations demonstrate the reliability and superiority of the proposed method,and reveal the impact of discount factor and packet buffer threshold on the system performance.

关 键 词：低地球轨道卫星系统 非正交多址接入 信息年龄 非稳态多臂赌博机 

分 类 号：TN92[电子电信—通信与信息系统]