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Paper Abstract and Keywords
Presentation 2019-05-30 16:45
Spectrum Sharing exploiting Spectrum Database for LPWA
Yudai Yamazaki, Takeo Fujii (UEC), Osamu Takyu (Shinshu Univ.), Mai Ohta (Fukuoka Univ.), Koichi Adachi (UEC)
Abstract (in Japanese) (See Japanese page) 
(in English) In the most of current low power wide area (LPWA), packet collisions of uplink communication are controlled by setting duty cycle (DC), which controls the transmission cycle not to exceed the predefined fixed threshold.
However, as the number of LPWA nodes increases, the fixed DC fatally increases the number of packet collisions and degrades the communication quality.
Therefore, in this paper, we propose an adaptive DC decision algorithm.
The proposed algorithm aims at adapting the period that the system interferes with others and reducing the packet loss rate of uplink communication of the whole system to below the required value by adapting DC with the help of measurement-based spectrum database (MSD).
In the proposed method, MSD knows the number of LoRa nodes that interfere with the nodes of other systems.
The DC is calculated for keeping the period of interference to less than a certain duration.
In addition, the DC is also adapted based on the required packet loss rate to improve communication efficiency.
Computer simulation results show that the allowable interference time ratio and the required packet loss rate can be accurately guaranteed compared to the conventional method with the fixed DC even if the number of nodes increases.
Keyword (in Japanese) (See Japanese page) 
(in English) Spectrum Database / LPWA / Spectrum Sharing / / / / /  
Reference Info. IEICE Tech. Rep., vol. 119, no. 62, SR2019-10, pp. 63-68, May 2019.
Paper # SR2019-10 
Date of Issue 2019-05-23 (SR) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380

Conference Information
Committee SR  
Conference Date 2019-05-30 - 2019-05-31 
Place (in Japanese) (See Japanese page) 
Place (in English) Tokyo Big Sight 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Technical Exhibition, LPWA, General 
Paper Information
Registration To SR 
Conference Code 2019-05-SR 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Spectrum Sharing exploiting Spectrum Database for LPWA 
Sub Title (in English)  
Keyword(1) Spectrum Database  
Keyword(2) LPWA  
Keyword(3) Spectrum Sharing  
1st Author's Name Yudai Yamazaki  
1st Author's Affiliation The University of Electro-Communications (UEC)
2nd Author's Name Takeo Fujii  
2nd Author's Affiliation The University of Electro-Communications (UEC)
3rd Author's Name Osamu Takyu  
3rd Author's Affiliation Shinshu University (Shinshu Univ.)
4th Author's Name Mai Ohta  
4th Author's Affiliation Fukuoka University (Fukuoka Univ.)
5th Author's Name Koichi Adachi  
5th Author's Affiliation The University of Electro-Communications (UEC)
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Date Time 2019-05-30 16:45:00 
Presentation Time 25 
Registration for SR 
Paper # IEICE-SR2019-10 
Volume (vol) IEICE-119 
Number (no) no.62 
Page pp.63-68 
#Pages IEICE-6 
Date of Issue IEICE-SR-2019-05-23 

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