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Paper Abstract and Keywords
Presentation 2019-06-20 10:00
Low Latency HARQ Method Using Early Retransmission Before Channel Decoding Based on Superposition Coding
Koka Miura (Tokyo Univ. of Science), Yoshihisa Kishiyama (NTT DOCOMO), Kenichi Higuchi (Tokyo Univ. of Science) RCS2019-66
Abstract (in Japanese) (See Japanese page) 
(in English) This paper proposes a superposition coding-based early retransmission scheme in our previously reported low latency hybrid automatic repeat request (HARQ) using early retransmission before channel decoding. The low latency HARQ method can mitigate the increased transmission latency resulting mainly from the delay time required for the channel decoding in HARQ by requesting early retransmission before channel decoding process is completed based on the channel state information obtained before channel decoding. However, the early-retransmission decision may include error, which results in unnecessary retransmission and consequently throughput loss. The proposed method mitigates this throughput loss due to the unnecessary early-retransmission by multiplexing the early-retransmission packet and initial packet for next transmission attempt within the same transmission band (time/frequency) by using the superposition coding. The receiver applies an inter-packet interference canceller to cancel out the interference to the initial packet for next transmission attempt from the superimposed early-retransmission packet. The point is that when the early-retransmission is unnecessary as the corresponding initial packet is eventually decoded successfully, which is the main problem we are focusing on, the interference canceller works perfectly since the successfully recovered information bit sequence of the early-retransmission packet can be utilized. This contributes the performance enhancement obtained by using the proposed method. Simulation results show that the proposed method further improves the achievable tradeoff between the transmission latency and throughput.
Keyword (in Japanese) (See Japanese page) 
(in English) 5G / hybrid ARQ / URLLC / early retransmission / superposition coding / / /  
Reference Info. IEICE Tech. Rep., vol. 119, no. 90, RCS2019-66, pp. 175-180, June 2019.
Paper # RCS2019-66 
Date of Issue 2019-06-12 (RCS) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
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. (No. 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF RCS2019-66

Conference Information
Committee RCS  
Conference Date 2019-06-19 - 2019-06-21 
Place (in Japanese) (See Japanese page) 
Place (in English) Miyakojima Hirara Port Terminal Building 
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 2019-06-RCS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Low Latency HARQ Method Using Early Retransmission Before Channel Decoding Based on Superposition Coding 
Sub Title (in English)  
Keyword(1) 5G  
Keyword(2) hybrid ARQ  
Keyword(3) URLLC  
Keyword(4) early retransmission  
Keyword(5) superposition coding  
1st Author's Name Koka Miura  
1st Author's Affiliation Tokyo University of Science (Tokyo Univ. of Science)
2nd Author's Name Yoshihisa Kishiyama  
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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Date Time 2019-06-20 10:00:00 
Presentation Time 10 
Registration for RCS 
Paper # IEICE-RCS2019-66 
Volume (vol) IEICE-119 
Number (no) no.90 
Page pp.175-180 
#Pages IEICE-6 
Date of Issue IEICE-RCS-2019-06-12 

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