| ZHANG Mengying（张梦莹）,YANG Xiumei,BU Zhiyong.[J].高技术通讯(英文),2023,29(2):140~147 |
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| Resource allocation for uplink grant free access in beam hopping based LEO satellite systems |
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| DOI：10. 3772/ j. issn. 1006-6748. 2023. 02. 004 |
| 中文关键词: |
| 英文关键词: low earth orbit (LEO) satellite system, grant free access, beam hopping (BH), resource allocation, collision |
| 基金项目: |
| Author Name | Affiliation | | ZHANG Mengying（张梦莹） | (Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, P. R. China)
(University of Chinese Academy of Sciences, Beijing 100049, P. R. China) | | YANG Xiumei | (Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, P. R. China)
(University of Chinese Academy of Sciences, Beijing 100049, P. R. China) | | BU Zhiyong | (Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, P. R. China)
(University of Chinese Academy of Sciences, Beijing 100049, P. R. China) |
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| 中文摘要: |
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| 英文摘要: |
| The low earth orbit (LEO) satellite system provides a promising solution for the global coverage of Internet of Things (IoT) services.Confronted with the sporadic uplink transmission from massive IoT terminals, this work investigates the grant free access scheme and resource allocation algorithm for the beam hopping (BH) based LEO satellite systems.To improve the packet success rate, the time slots are pre allocated to each cell according to the number of terrestrial terminals and the probability of packet arrival.When the packets arrive, the terrestrial terminals perform contention free or contention based grant free access with packet repetition in the time slots allocated to their cells.The analytical expression of the packet collision probability for the grant free access scheme is derived to provide reference for the resource allocation.To reduce the computational complexity, a heuristic resource allocation algorithm is proposed to minimize the maximum cell packet collision probability in the system.Simulation results show that the proposed resource allocation scheme achieves lower packet collision probability and higher resource utilization ratio when compared with the uniform resource allocation scheme. |
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