面向5G-A卫星物联网场景的前导复用随机接入策略  

Preamble reuse random access strategy based on 5G-A satelliteIoT scenarios

作　　者：赵露 彭大芹[1] 何俊龙 徐浩[1] ZHAO Lu;PENG Daqin;HE Junlong;XU Hao(School of Communications and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,P.R.China)

机构地区：[1]重庆邮电大学通信与信息工程学院,重庆400065

出　　处：《重庆邮电大学学报(自然科学版)》2025年第2期241-249,共9页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：国家自然科学基金项目(62171072)。

摘　　要：为了提高网络的接入成功率和有限前导资源利用率,提出了一种基于机器类型设备(machine type devices,MTD)分组和功率控制的前导复用随机接入策略。利用地面MTD与卫星基站之间的实时仰角关系,动态规划同一波束内不同位置的MTD,建立不同分组索引与前导序列和发射功率的映射关系;通过不同分组的MTD使用不同发射功率产生的干扰消除效应来降低接入过程中前导序列碰撞率。仿真结果表明,提出的策略在大规模卫星物联网设备接入时具有良好的接入成功率和前导序列利用率,适应性和高效性优于其他资源再分配接入技术。To enhance access success rates and optimize the utilization of limited preamble resources,this paper proposes a preamble reuse random access strategy based on machine-type device(MTD)grouping and power control.By leveraging the real-time elevation angle relationship between ground-based MTDs and the satellite base station,a dynamic planning approach is adopted to group MTDs within the same beam based on their positions.A mapping relationship between different group indices,preamble sequences,and transmission power levels is established.The proposed strategy utilizes the interference cancellation effect from different transmission power levels among MTD groups to reduce preamble sequence collision rates during the access process.Simulation results demonstrate that the proposed scheme achieves a high access success rate and efficient preamble sequence utilization in large-scale satellite IoT scenarios,outperforming other resource reallocation-based access techniques in adaptability and efficiency.

关 键 词：卫星物联网 随机接入 前导复用 功率控制 

分 类 号：TN929[电子电信—通信与信息系统]