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Paper Abstract and Keywords
Presentation 2017-12-15 10:55
Broadcast Assist for Improvement on the Number of the Accommodated Nodes in V2X-based Crash Warning Application
Takeshi Hirai, Tutomu Murase (Nagoya Univ.) WBS2017-68 ITS2017-45 RCC2017-84
Abstract (in Japanese) (See Japanese page) 
(in English) In V2X-DSRC based Crash Warning Application (CWA), to prevent congestion of information frames of CWA-information frames increases the number of accommodated nodes (vehicles and pedestrians). The number is the maximum number of the nodes to meet the CWA requirements, a specific number of received frames. Higher speed nodes is likely to receive smaller number of frames at a certain time before a potential crash. To compensate the number, relay method for CWA-information frames was a promising way to increase the number of frames. Because of producing frame congestion by redundant relay frames, conventional relay methods looks difficult to be applied to CWA application which uses broadcast communications. This paper proposes Broadcast Assist method. The proposed method can suppress the redundant relay frames by two novel ideas. First idea is to estimate the number of necessary additional frames by considering the capture effect. Second idea is to probabilistically relay a frame without excessive or insufficient amount and with suitable to an autonomous decentralized manner of CWA. Simulation results show the proposed method could accommodate 74% more nodes than that of flooding method.
Keyword (in Japanese) (See Japanese page) 
(in English) V2X / IEEE802.11p / DSRC / crash warning / relay / broadcast / /  
Reference Info. IEICE Tech. Rep., vol. 117, no. 347, ITS2017-45, pp. 185-190, Dec. 2017.
Paper # ITS2017-45 
Date of Issue 2017-12-07 (WBS, ITS, RCC) 
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 WBS2017-68 ITS2017-45 RCC2017-84

Conference Information
Committee ITS WBS RCC  
Conference Date 2017-12-14 - 2017-12-15 
Place (in Japanese) (See Japanese page) 
Place (in English) Tiruru/Okinawa Jichikaikan 
Topics (in Japanese) (See Japanese page) 
Topics (in English) ITS Communications, Reliable Communication and Control, Rader and Sensing, etc. 
Paper Information
Registration To ITS 
Conference Code 2017-12-ITS-WBS-RCC 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Broadcast Assist for Improvement on the Number of the Accommodated Nodes in V2X-based Crash Warning Application 
Sub Title (in English)  
Keyword(1) V2X  
Keyword(2) IEEE802.11p  
Keyword(3) DSRC  
Keyword(4) crash warning  
Keyword(5) relay  
Keyword(6) broadcast  
1st Author's Name Takeshi Hirai  
1st Author's Affiliation Nagoya University (Nagoya Univ.)
2nd Author's Name Tutomu Murase  
2nd Author's Affiliation Nagoya University (Nagoya Univ.)
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Date Time 2017-12-15 10:55:00 
Presentation Time 25 
Registration for ITS 
Paper # IEICE-WBS2017-68,IEICE-ITS2017-45,IEICE-RCC2017-84 
Volume (vol) IEICE-117 
Number (no) no.346(WBS), no.347(ITS), no.348(RCC) 
Page pp.185-190 
#Pages IEICE-6 
Date of Issue IEICE-WBS-2017-12-07,IEICE-ITS-2017-12-07,IEICE-RCC-2017-12-07 

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