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Paper Abstract and Keywords
Presentation 2021-10-22 15:00
[Poster Presentation] Investigation of NOMA-Based Highly-Efficient Low-Latency Random Access
Kenichi Higuchi (Tokyo Univ. of Science) RCS2021-139
Abstract (in Japanese) (See Japanese page) 
(in English) In this paper, we introduce some of our recent studies on highly-efficient low-latency random access that realize multi-packet reception based on non-orthogonal multiple access (NOMA). An advanced random access protocol needs to be investigated to accommodate uplink transmission for massive machine-type communications (mMTC) and ultra-reliable low latency communications (URLLC) in the fifth-generation mobile communication system (5G NR) and beyond. Here, we consider the two-step random access, where the preamble and data are simultaneously transmitted unlike the 4G LTE/LTE-Advanced, to reduce the control signaling overhead and transmission latency compared to that for scheduling-based access. The technologies proposed by the authors introduced in this paper include (i) the effect of the bandwidth extension in NOMA-based random access with multi-packet reception, (ii) the physical channel identifier (PCID)-linked receiver beamforming (BF) method in the massive multi-antenna system to reduce the computational complexity and improve the active user detection and channel estimation accuracy at the base station receiver, (iii) the computationally-efficient preamble configuration for active user detection and channel estimation, (iv) the transmitter filtering (TF) method that realizes channel shortening, and (v) the efficient hybrid automatic repeat request (HARQ) method based on novel hierarchical tree-structured PCID groups that simultaneously achieves packet combining and resolution of the collisions of PCIDs during retransmission. Computer simulation shows the effectiveness of the advanced random access composed of the proposed technologies.
Keyword (in Japanese) (See Japanese page) 
(in English) Random access / grant free / multi-packet reception / NOMA / mMTC / URLLC / high efficiency / low latency  
Reference Info. IEICE Tech. Rep., vol. 121, no. 210, RCS2021-139, pp. 112-119, Oct. 2021.
Paper # RCS2021-139 
Date of Issue 2021-10-14 (RCS) 
ISSN Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF RCS2021-139

Conference Information
Committee RCS  
Conference Date 2021-10-21 - 2021-10-22 
Place (in Japanese) (See Japanese page) 
Place (in English) Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Wireless Communication Schemes, Wireless Communication Systems, Wireless Standards, Future Wireless Systems, etc. 
Paper Information
Registration To RCS 
Conference Code 2021-10-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Investigation of NOMA-Based Highly-Efficient Low-Latency Random Access 
Sub Title (in English)  
Keyword(1) Random access  
Keyword(2) grant free  
Keyword(3) multi-packet reception  
Keyword(4) NOMA  
Keyword(5) mMTC  
Keyword(6) URLLC  
Keyword(7) high efficiency  
Keyword(8) low latency  
1st Author's Name Kenichi Higuchi  
1st Author's Affiliation Tokyo University of Science (Tokyo Univ. of Science)
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Speaker Author-1 
Date Time 2021-10-22 15:00:00 
Presentation Time 60 minutes 
Registration for RCS 
Paper # RCS2021-139 
Volume (vol) vol.121 
Number (no) no.210 
Page pp.112-119 
#Pages 8 
Date of Issue 2021-10-14 (RCS) 

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