Abstract
Radio frequency identification (RFID) is a promising wireless technology for using tiny, remotely powered chips as identifiers. The number of RFID applications is rapidly increasing because RFID technology is convenient, fast, and contactless. However, collisions occur when multiple tags simultaneously transmit their IDs. Therefore, an efficient anti-collision algorithm is needed to accelerate tag identification. In some applications, the reader may repeatedly identify staying tags, which constantly exist in the reader's range. The adaptive query splitting algorithm (AQS) was proposed for reserving information obtained from the last identification process to enable rapid re-identification of staying tags. However, since AQS is a non-blocking algorithm that allows newly arriving tags to use the slots reserved for staying tags, collisions among them are problematic. Thus, semi-blocking AQS (SBA) proposed in this study is designed to reduce the collisions between arriving tags and staying tags by applying a semi-blocking technique in which only a minority of arriving tags use the slots reserved for staying tags. By counting the number of minor arriving tags, SBA estimates the number of unrecognized arriving tags and generates proper queries to minimize their collisions. The identification delay of SBA is analyzed, and simulation results show that SBA significantly outperforms AQS.
Highlights
Radio frequency identification (RFID) has substantially replaced the conventional bar code system of automated identification because RFID is faster, more convenient, and contactless
(1) We propose a semi-blocking algorithm, semi-blocking AQS (SBA), to quickly identify staying tags and arriving tags
The blocking technique performed by single resolution blocking ABS algorithm (SRB) and pair resolution blocking ABS algorithm (PRB) enables the use of different slots by arriving tags and staying tags, which prevents the former from colliding with the latter
Summary
Radio frequency identification (RFID) has substantially replaced the conventional bar code system of automated identification because RFID is faster, more convenient, and contactless. Afterward, based on AQS and ABS, some blocking algorithms, which block arriving tags from using the slots reserved for staying tags, were proposed to prevent their mutual collisions [22,23,24] These blocking algorithms need the information from the last frame to estimate the number of arriving tags. The blocking technique performed by SRB and PRB enables the use of different slots by arriving tags and staying tags, which prevents the former from colliding with the latter Since they are based on ABS, they require higher specifications in tags. The AQS and SBA differ in three ways The former is a nonblocking algorithm while the latter is a semi-blocking algorithm to reduce the collisions between staying tags and arriving tags. Like AQS, the reader in SBA has a queue, Q, but it only
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