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Paper Abstract and Keywords
Presentation 2022-09-16 14:00
A study on contention window size and carrier sense level for inter vehicle communication systems
Yuma Sato, Masahiro Fujii (Utsunomiya Univ.) ITS2022-8
Abstract (in Japanese) (See Japanese page) 
(in English) ARIB STD T-109 has been established as the ITS wireless communication standard in Japan, and CSMA/CA is used as the access control method.
In CSMA/CA, a uniform random number in the range from 0 to CWS is used to determine the backoff time, and ARIB STD T-109 defines the contention window size CWS to be 63.
The carrier sense level, which is a threshold for determining the channel state, is set at -53 dBm.
Although these functions allow CSMA/CA to avoid and detect collisions in transmitted frames, they do not completely avoid the occurrence of frame collisions due to remaining backoff time matching and hidden terminal problems.
In this paper, we evaluate communication performances by computer simulations with the parameters of the contention window size to avoid the match of residual backoff time and the carrier sense level to avoid the hidden terminal problem.
Keyword (in Japanese) (See Japanese page) 
(in English) Inter-Vehicle Communication / CSMA/CA / Contention window size / Carrier sense level / / / /  
Reference Info. IEICE Tech. Rep., vol. 122, no. 190, ITS2022-8, pp. 12-16, Sept. 2022.
Paper # ITS2022-8 
Date of Issue 2022-09-09 (ITS) 
ISSN Online edition: ISSN 2432-6380
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Conference Information
Conference Date 2022-09-16 - 2022-09-16 
Place (in Japanese) (See Japanese page) 
Place (in English) Waim Meeting Room 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To ITS 
Conference Code 2022-09-ITS-ITS-ITS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A study on contention window size and carrier sense level for inter vehicle communication systems 
Sub Title (in English)  
Keyword(1) Inter-Vehicle Communication  
Keyword(2) CSMA/CA  
Keyword(3) Contention window size  
Keyword(4) Carrier sense level  
1st Author's Name Yuma Sato  
1st Author's Affiliation Utsunomiya University (Utsunomiya Univ.)
2nd Author's Name Masahiro Fujii  
2nd Author's Affiliation Utsunomiya University (Utsunomiya Univ.)
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Speaker Author-1 
Date Time 2022-09-16 14:00:00 
Presentation Time 20 minutes 
Registration for ITS 
Paper # ITS2022-8 
Volume (vol) vol.122 
Number (no) no.190 
Page pp.12-16 
Date of Issue 2022-09-09 (ITS) 

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