On the Performance Evaluations of Cooperative Retransmission Scheme for Cell-Edge Users of URLLC in Multi-Carrier Downlink NOMA Systems

Non-orthogonal multiple access (NOMA) has a key feature that the cell-center user (CCU) has prior information about the messages of the cell-edge user (CEU) in the same user-pair. It means that CCU can be used for retransmission when the CEU requests retransmission. As ultra-reliability and low-late...

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Autores principales:	Won-Jae Ryu, Jae-Woo Kim, Soo-Young Shin, Dong-Seong Kim
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	cell-edge user (CEU) non-orthogonal multiple access (NOMA) retransmission ultra-reliable and low-latency communication (URLLC) cooperative transmission Chemical technology TP1-1185
Acceso en línea:	https://doaj.org/article/141cfa5c142349cba0a3901469cd6219
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spelling	oai:doaj.org-article:141cfa5c142349cba0a3901469cd62192021-11-11T19:04:42ZOn the Performance Evaluations of Cooperative Retransmission Scheme for Cell-Edge Users of URLLC in Multi-Carrier Downlink NOMA Systems10.3390/s212170521424-8220https://doaj.org/article/141cfa5c142349cba0a3901469cd62192021-10-01T00:00:00Zhttps://www.mdpi.com/1424-8220/21/21/7052https://doaj.org/toc/1424-8220Non-orthogonal multiple access (NOMA) has a key feature that the cell-center user (CCU) has prior information about the messages of the cell-edge user (CEU) in the same user-pair. It means that CCU can be used for retransmission when the CEU requests retransmission. As ultra-reliability and low-latency communication (URLLC) requires high-reliability constraints (e.g., 99.999%), using CCU for retransmission can be useful to satisfy the reliability constraint. In this study, to ensure the reliability of CEU, cooperative retransmission (CR) scheme for downlink NOMA systems is proposed. And the CR scheme is evaluated with Block error rate (BLER) considering reliability and with packet loss rate (PLR) in terms of reliability and latency constraints. And the evaluation results showed that the proposed CR scheme can satisfy the target BLER for URLLC low SNR compared to the conventional retransmission scheme, and showed the improved PLR compared to the conventional retransmission scheme in low SNRs.Won-Jae RyuJae-Woo KimSoo-Young ShinDong-Seong KimMDPI AGarticlecell-edge user (CEU)non-orthogonal multiple access (NOMA)retransmissionultra-reliable and low-latency communication (URLLC)cooperative transmissionChemical technologyTP1-1185ENSensors, Vol 21, Iss 7052, p 7052 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	cell-edge user (CEU) non-orthogonal multiple access (NOMA) retransmission ultra-reliable and low-latency communication (URLLC) cooperative transmission Chemical technology TP1-1185
spellingShingle	cell-edge user (CEU) non-orthogonal multiple access (NOMA) retransmission ultra-reliable and low-latency communication (URLLC) cooperative transmission Chemical technology TP1-1185 Won-Jae Ryu Jae-Woo Kim Soo-Young Shin Dong-Seong Kim On the Performance Evaluations of Cooperative Retransmission Scheme for Cell-Edge Users of URLLC in Multi-Carrier Downlink NOMA Systems
description	Non-orthogonal multiple access (NOMA) has a key feature that the cell-center user (CCU) has prior information about the messages of the cell-edge user (CEU) in the same user-pair. It means that CCU can be used for retransmission when the CEU requests retransmission. As ultra-reliability and low-latency communication (URLLC) requires high-reliability constraints (e.g., 99.999%), using CCU for retransmission can be useful to satisfy the reliability constraint. In this study, to ensure the reliability of CEU, cooperative retransmission (CR) scheme for downlink NOMA systems is proposed. And the CR scheme is evaluated with Block error rate (BLER) considering reliability and with packet loss rate (PLR) in terms of reliability and latency constraints. And the evaluation results showed that the proposed CR scheme can satisfy the target BLER for URLLC low SNR compared to the conventional retransmission scheme, and showed the improved PLR compared to the conventional retransmission scheme in low SNRs.
format	article
author	Won-Jae Ryu Jae-Woo Kim Soo-Young Shin Dong-Seong Kim
author_facet	Won-Jae Ryu Jae-Woo Kim Soo-Young Shin Dong-Seong Kim
author_sort	Won-Jae Ryu
title	On the Performance Evaluations of Cooperative Retransmission Scheme for Cell-Edge Users of URLLC in Multi-Carrier Downlink NOMA Systems
title_short	On the Performance Evaluations of Cooperative Retransmission Scheme for Cell-Edge Users of URLLC in Multi-Carrier Downlink NOMA Systems
title_full	On the Performance Evaluations of Cooperative Retransmission Scheme for Cell-Edge Users of URLLC in Multi-Carrier Downlink NOMA Systems
title_fullStr	On the Performance Evaluations of Cooperative Retransmission Scheme for Cell-Edge Users of URLLC in Multi-Carrier Downlink NOMA Systems
title_full_unstemmed	On the Performance Evaluations of Cooperative Retransmission Scheme for Cell-Edge Users of URLLC in Multi-Carrier Downlink NOMA Systems
title_sort	on the performance evaluations of cooperative retransmission scheme for cell-edge users of urllc in multi-carrier downlink noma systems
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/141cfa5c142349cba0a3901469cd6219
work_keys_str_mv	AT wonjaeryu ontheperformanceevaluationsofcooperativeretransmissionschemeforcelledgeusersofurllcinmulticarrierdownlinknomasystems AT jaewookim ontheperformanceevaluationsofcooperativeretransmissionschemeforcelledgeusersofurllcinmulticarrierdownlinknomasystems AT sooyoungshin ontheperformanceevaluationsofcooperativeretransmissionschemeforcelledgeusersofurllcinmulticarrierdownlinknomasystems AT dongseongkim ontheperformanceevaluationsofcooperativeretransmissionschemeforcelledgeusersofurllcinmulticarrierdownlinknomasystems
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On the Performance Evaluations of Cooperative Retransmission Scheme for Cell-Edge Users of URLLC in Multi-Carrier Downlink NOMA Systems

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