重庆邮电大学学报（自然科学版）2025，Vol.37Issue(2)：241-249,9.DOI:10.3979/j.issn.1673-825X.202404090082
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 satellite IoT scenarios
摘要
Abstract
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 ap-proach 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 interfer-ence 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Key words
satellite internet of things(IoT)/random access/preamble reuse/power control分类
电子信息工程引用本文复制引用
赵露,彭大芹,何俊龙,徐浩..面向5G-A卫星物联网场景的前导复用随机接入策略[J].重庆邮电大学学报（自然科学版）,2025,37(2):241-249,9.基金项目
国家自然科学基金项目(62171072) National Natural Science Foundation of China(62171072) （62171072）
