In radio frequency identification systems, some applications require tags to be identified repeatedly. To achieve this, many protocols have been proposed that use information obtained from the previous tag identification process to quickly re-identify tags remaining within the communication range of the reader. However, none of these protocols consider the capture effect, and thus may not be effective in real wireless communication environments. When multiple tags simultaneously reply to a reader, the reader may consider the strongest signal to be a successful transmission rather than a collision and ignore all other replies. In this paper, we propose a new capture-aware anti-collision protocol based on the couple-resolution blocking (CRB) protocol that efficiently identifies tags repeatedly. We demonstrate that the CRB protocol suffers from the capture effect in which some tags may not be identified in practical environments. To solve this problem of the capture effect, we modify the CRB protocol by adopting the state-of-the-art capture-aware anti-collision protocol known as the multi-round collision tree (MRCT) protocol. Through computer simulation, we show that the proposed protocol with MRCT can reduce the number of slots required by approximately 50% in a random topology where most tags remain in the communication range of the reader.
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This work was supported by the National Research Foundation of Korea (NRF) Grant funded by the Korean Government (MSIP) (No. 2011-0023856) and (No. 2016R1A5A1012966).
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Choi, Hi., Kim, Hj. & Choi, S. Capture-Aware Couple-Resolution Blocking Protocol in RFID Systems. Wireless Pers Commun 93, 969–986 (2017). https://doi.org/10.1007/s11277-016-3940-2
- Anti-collision algorithm
- Capture effect
- RFID tag re-identification