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The Slotted-LBT: A RFID Reader Medium Access Scheme in Dense Reader Environments

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4 Author(s)
Cheng-Hao Quan ; RFID System Research Team, Electronics and Telecommunications Research Institute (ETRI), 161 Gajeong-dong, Yuseong-gu, Daejeon, Korea. chquan@etri.re.kr ; Jin-Chul Choi ; Gil-Young Choi ; Chae-Woo Lee

RFID technology as a core technology for realizing ubiquitous environment is emerged. Although it was developed rapidly in the past few years, the read rate is still a concern in the RFID technology adoption. At the same time it is also a technical issue which must be resolved. In order to increase the read rate, a number of researches have focused on the air protocol method and the medium access method. In this paper, we propose a distributed Slotted-LBT method to increase the number of readers which can read tags simultaneously, to provide a stable channel access time, and to reduce the interference among readers by using a channel zone. From the results in this research, compared with the existing normal LBT method, the proposed Slotted-LBT method shows that the coefficient of variation for the channel access time is reduced from 96% to 38% and the effect of interference is reduced by 28.48%. Besides, since each channel can be controlled separately, we can use categorized channels according to demanding features of manifold applications.

Published in:

2008 IEEE International Conference on RFID

Date of Conference:

16-17 April 2008