卫星物联网系统的新型多址接入技术

doi:10.11959/j.issn.2096-8930.2023028

Abstract

Abstract:

For satellite internet of things (IoT) scenarios with high propagation delay and the need to serve a larger number of users, firstly the shortcomings of IoT NTN in terms of technical solutions were analyzed, and then a new type of multi access solution called uncoordinated random access and NOMA transmission (URAT) was proposed.“Uncoordinated” refers to the process where a terminal does not require specialized network coordination signaling; “NOMA transmission” refers to the sharing of base station time-frequency resources by all terminals; URAT also achieves the integration of multiple access and NOMA transmission.Theoretical analysis and numerical simulation results indicated that the proposed scheme could reduce multi access latency, improve system efficiency, and increase the number of devices that could be served.It will be a potential solution for the 6G satellite IoT scenarios.

Key words: satellite IoT, IoT NTN, multiple access, URAT

CLC Number:

TP393

Wei BAI, Yujie ZHANG, Shaoli KANG, Deshan MIAO, Shaohui SUN, Shanzhi CHEN. New Multiple Access Technologies for Satellite Internet of Things System[J]. Space-Integrated-Ground Information Networks, 2023, 4(3): 31-39.

Figures/Tables 11

References 26

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步骤	时延大小	解释
发送MSG1	1 slot	第一次传输
等待MSG2	ra-Response Window	RAR 窗口在 RO 的最后一个符号之后，从用于接收 Typel-PDCCH CSS 的最早CORESET的第一个符号开始
可能重发MSG1	（N_T,1+0.75）ms+1 slot	在 RAR 窗口的最后一个符号之后或者 PDSCH 接收的最后一个符号之后的（N_T,1+0.75）ms内进行PRACH重传，最大重传次数为Preamble Trans Max
发送MSG3	（N_T,1+N_T,2+0.5）ms+1 slot	所接收的、承载RAR的PDSCH的最后一个符号与该RAR调度的MSG3的PUSCH传输的第一个符号之间的最小时间等于（N_T,1+N_T,2+0.5）ms
等待MSG4	ra-Contention Resolution Timer	从发送MSG3的最后一个符号之后开始，启动计数器，到接收到MSG4
发送HARQ-ACK	（N_T,1+0.5）ms+1 slot	发送包含HARQ-ACK信息的PUCCH的第一个符号与所接收的相应PDSCH的最后一个符号之间的最小时间等于（N_T,1+0.5）ms
发送SR、等待UL grant、发送数据、等待HARQ确认、重传	（n+1）×（T0+T1+T2+T3）	n是重传次数，T0是发送调度请求的时间，T1是等待UL grant的时间，T2从UE发送数据的时间，T3是等到HARQ反馈的时间

步骤	时延大小	解释
发送MSGA	2 slot	第一次传输
等待MSGB	ra-Response Window	RAR窗口在RO的最后一个符号之后，从用于接收Typel-PDCCH CSS的最早CORESET的第一个符号开始
可能重发MSGA	（N_T,1+0.75）ms+2 slot	在RAR窗口的最后一个符号之后或者PDSCH接收的最后一个符号之后的（N_T,1+0.75）ms内进行PRACH重传，最大重传次数为Preamble Trans Max
发送HARQ-ACK	（N_T,1+0.5）ms+1 slot	发送包含HARQ-ACK信息的PUCCH的第一个符号与所接收的相应PDSCH的最后一个符号之间的最小时间等于（N_T,1+0.5）ms
发送SR、等待UL grant、发送数据、等待HARQ确认、重传	（n+1）×（T0+ T1+T2+T3）	n是重传次数，T0是发送调度请求的时间，T1是等待UL grant的时间，T2从UE发送数据的时间，T3是等到HARQ反馈的时间

步骤	时延大小	解释
发送MSGA	2 slot	第一次传输
等待MSGB	ra-Response Window	RAR窗口在RO的最后一个符号之后，从用于接收Typel-PDCCH CSS的最早CORESET的第一个符号开始
可能重发MSGA	（N_T,1+0.75）ms+2 slot	在RAR窗口的最后一个符号之后或者PDSCH接收的最后一个符号之后的（N_T,1+0.75）ms内进行PRACH重传，最大重传次数为Preamble Trans Max
发送HARQ-ACK	（N_T,1+0.5）ms+1 slot	发送包含HARQ-ACK信息的PUCCH的第一个符号与所接收的相应PDSCH的最后一个符号之间的最小时间等于（N_T,1+0.5）ms

步骤	时延大小	解释
发送msgU	2 slot	第一次传输
等待HARQ反馈确认信息	（N_T,1+N_T,2+0.5）ms+1 slot	所发送的msgU的最后一个符号与该msgU的反馈HARQ的第一个符号之间的最小时间等于（N_T,1+N_T,2+0.5）ms
可能重发msgU	（N_T,1+0.5）ms+2 slot	在RAR窗口的最后一个符号之后的（N_T,1+0.5）ms内进行msgU重传，最大重传次数为Preamble Trans Max

参数	取值
1 slot	1 ms
N_T,1	10/14 ms
N_T,2	12/14 ms

New Multiple Access Technologies for Satellite Internet of Things System

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