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Paper Abstract and Keywords
Presentation 2019-11-05 09:00
[Invited Talk] Study on performance improvement of 5G ultra-reliable and low latency communications
Eiji Okamoto (NITech) SR2019-74
Abstract (in Japanese) (See Japanese page) 
(in English) For applications and services of connected vehicles, the new use case of ultra-reliable and low-latency communications (URLLC) has been added in the fifth generation mobile communications system (5G), in addition to the conventional 4G use case of enhanced mobile broadband (eMBB). The typical requirements of URLLC are the reliability of 32-byte packet transmission is more than 99.999 %, and the maximum air latency is 1 ms. Furthermore, high frequencies not only in microwave band but also millimeter-wave band such as 28 GHz are used in 5G to realize a large-capacity transmission, including URLLC. However, according to the frequency increase, a cell coverage becomes small due to a large propagation loss, and the maximum Doppler frequency of fading becomes high, resulting in a severe transmission performance degradation. Therefore, to satisfy the various performance requirements such as the reliability, latency, and energy efficiency in 5G URLLC, applying additional technologies are indispensable. We have studied some schemes to tackle this problem and to improve the performance of URLLC. In particular, we consider exploiting a cooperative vehicle-to-vehicle transmission to improve an uplink vehicle-to-infrastructure (V2I) transmission from far vehicle, an adaptive beam tracking scheme at the vehicle side for uplink V2I transmission, and an open-loop hybrid automatic repeat request scheme for low-latency transmission. In this study, we introduce these schemes.
Keyword (in Japanese) (See Japanese page) 
(in English) 5G / ultra-reliable and low-latency communications / uplink / cellular vehicle to everything / hybrid automatic repeat request / / /  
Reference Info. IEICE Tech. Rep., vol. 119, no. 262, SR2019-74, pp. 27-27, Nov. 2019.
Paper # SR2019-74 
Date of Issue 2019-10-28 (SR) 
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. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
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Conference Information
Committee SR  
Conference Date 2019-11-04 - 2019-11-06 
Place (in Japanese) (See Japanese page) 
Place (in English) Rutgers University Inn & Conference Center, NJ, USA 
Topics (in Japanese) (See Japanese page) 
Topics (in English) SmartCom2019 
Paper Information
Registration To SR 
Conference Code 2019-11-SR 
Language English 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Study on performance improvement of 5G ultra-reliable and low latency communications 
Sub Title (in English)  
Keyword(1) 5G  
Keyword(2) ultra-reliable and low-latency communications  
Keyword(3) uplink  
Keyword(4) cellular vehicle to everything  
Keyword(5) hybrid automatic repeat request  
1st Author's Name Eiji Okamoto  
1st Author's Affiliation Nagoya Institute of Technology (NITech)
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Date Time 2019-11-05 09:00:00 
Presentation Time 30 
Registration for SR 
Paper # IEICE-SR2019-74 
Volume (vol) IEICE-119 
Number (no) no.262 
Page p.27 
#Pages IEICE-1 
Date of Issue IEICE-SR-2019-10-28 

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