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| Presentation | 2021-06-23 13:00 Efficient HARQ Method Using Hierarchically Structured Physical Channel Identifiers in NOMA-based Random Access for Multi-Packet Reception Megumi Asada (Tokyo Univ. of Science), Nobuhide Nonaka (NTT DOCOMO), Kenichi Higuchi (Tokyo Univ. of Science)  RCS2021-36 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | This paper proposes an efficient hybrid automatic repeat request (HARQ) method achieving both the packet combining and resolution of physical channel identifiers (PCID) collision during the retransmission in a non-orthogonal multiple access (NOMA)-based random access system for multi-packet reception. Here, PCID represents the separator of simultaneously received packets using the same channel in NOMA; an example is a scrambling code used in 4G and 5G. Since the PCID is independently selected by users, decoding of received packets fails when multiple users select the same PCID. Independent reselection of PCID at the retransmission stage can resolve the PCID collision, however, the packet combining between the initial packet and retransmitted one is not possible in this case, since the relation of PCIDs between the initial and retransmission packets is not known at the base station receiver. To solve the problem, we propose a novel hierarchically structured PCIDs in which the PCID for initial packet transmission has one-to-one relation to the set of PCIDs for retransmissions. The proposed method achieves the resolution of the PCID collision at the retransmission stage by independent reselection of PCIDs at each user from the PCID set for retransmission which is dedicated to the PCID selected at the initial transmission. Since the relations between the PCIDs at the initial transmission and retransmission is known at the base station, packet combining is achieved simultaneously. Computer simulation results show the effectiveness of the proposed method. | |
| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | Random access / multi-packet reception / NOMA / mMTC / URLLC / hybrid ARQ / / | |
| Reference Info. | IEICE Tech. Rep., vol. 121, no. 72, RCS2021-36, pp. 43-48, June 2021. | |
| Paper # | RCS2021-36 | |
| Date of Issue | 2021-06-16 (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 | RCS2021-36 |
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| Conference Information | |
| Committee | RCS |
| Conference Date | 2021-06-23 - 2021-06-25 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Online |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | First Presentation in IEICE Technical Committee, Resource Control, Scheduling, Wireless Communications, etc. |
| Paper Information | |
| Registration To | RCS |
| Conference Code | 2021-06-RCS |
| Language | Japanese |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Efficient HARQ Method Using Hierarchically Structured Physical Channel Identifiers in NOMA-based Random Access for Multi-Packet Reception |
| Sub Title (in English) | |
| Keyword(1) | Random access |
| Keyword(2) | multi-packet reception |
| Keyword(3) | NOMA |
| Keyword(4) | mMTC |
| Keyword(5) | URLLC |
| Keyword(6) | hybrid ARQ |
| Keyword(7) | |
| Keyword(8) | |
| 1st Author's Name | Megumi Asada |
| 1st Author's Affiliation | Tokyo University of Science (Tokyo Univ. of Science) |
| 2nd Author's Name | Nobuhide Nonaka |
| 2nd Author's Affiliation | NTT DOCOMO, INC. (NTT DOCOMO) |
| 3rd Author's Name | Kenichi Higuchi |
| 3rd Author's Affiliation | Tokyo University of Science (Tokyo Univ. of Science) |
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| Speaker | Author-1 |
| Date Time | 2021-06-23 13:00:00 |
| Presentation Time | 10 minutes |
| Registration for | RCS |
| Paper # | RCS2021-36 |
| Volume (vol) | vol.121 |
| Number (no) | no.72 |
| Page | pp.43-48 |
| #Pages | 6 |
| Date of Issue | 2021-06-16 (RCS) |
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