Appl. Sci. 2016, 6(12), 427; doi:10.3390/app6120427
Dominant Channel Occupancy for Wi-Fi Backscatter Uplink in Industrial Internet of Things
1
Department of Convergence Software, Hallym University, 1 Hallymdaehak-gil, Chuncheon-si, Gangwon-do 24252, South Korea
2
Network Convergence Research Center, Korea Electronics Technology Institute, 11 World Cup buk-ro 54-gil, Mapo-gu, Seoul 03924, South Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Wen-Hsiang Hsieh
Received: 9 October 2016 / Revised: 23 November 2016 / Accepted: 8 December 2016 / Published: 13 December 2016
(This article belongs to the Special Issue Selected Papers from the International Multi-Conference on Engineering and Technology Innovation 2015 (IMETI2015))
Abstract
This paper presents a dominant channel occupancy (DCO) mechanism for the Wi-Fi backscatter uplink in the industrial Internet of things (IIoT). The DCO provides high-priority channel access and reliable burst transmission to the Wi-Fi backscatter devices, thereby enabling the Wi-Fi backscatter tag to deliver its tag information to the Wi-Fi reader without interference from neighboring legacy Wi-Fi devices to guarantee the timeliness and reliability of the IIoT system. For the former, we consider three types of medium access control (MAC) configurations: “carrier sense multiple access with collision avoidance (CSMA/CA) starting with short inter-frame space (SIFS)”, “freezing of the backoff period”, and “reduced CWmin.” In addition, the DCO uses the SIFS between burst packets to guarantee reliable burst transmission. To verify the effectiveness of DCO and determine a proper value for MAC parameters, we conduct experimental simulations under IEEE 802.11n PHY/MAC environments. The simulation results show that the reduced CWmin has the most significant effect on the channel occupancy. The Wi-Fi backscatter devices achieve much higher throughput than the separate cases when two or more configurations are used simultaneously. Moreover, the results exhibit that the use of SIFS between consecutive packets supports reliable burst transmission regardless of the transmission of the legacy Wi-Fi devices in the vicinity. View Full-TextKeywords:
dominant channel occupancy; industrial Internet of things; MAC configuration; RF-powered device; Wi-Fi backscatter
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Kwon, J.-H.; Lee, H.-H.; Lim, Y.; Kim, E.-J. Dominant Channel Occupancy for Wi-Fi Backscatter Uplink in Industrial Internet of Things. Appl. Sci. 2016, 6, 427.
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