Reliable Identification of RFID Tags Using Multiple Independent Reader Sessions
Rasmus Jacobsen, Karsten Fyhn Nielsen, Petar Popovski, Torben Larsen

TL;DR
This paper introduces techniques using multiple independent RFID reader sessions to reliably estimate and ensure the probability of missing tags stays below a set threshold, improving RFID system reliability.
Contribution
It proposes two novel methods leveraging statistical independence assumptions to estimate tag reading success, enhancing reliability in RFID systems.
Findings
Methods accurately estimate missing tags probability when sessions are independent.
Proposed techniques meet target reliability with fewer reader sessions.
Estimators remain useful even if independence assumption is slightly violated.
Abstract
Radio Frequency Identification (RFID) systems are gaining momentum in various applications of logistics, inventory, etc. A generic problem in such systems is to ensure that the RFID readers can reliably read a set of RFID tags, such that the probability of missing tags stays below an acceptable value. A tag may be missing (left unread) due to errors in the communication link towards the reader e.g. due to obstacles in the radio path. The present paper proposes techniques that use multiple reader sessions, during which the system of readers obtains a running estimate of the probability to have at least one tag missing. Based on such an estimate, it is decided whether an additional reader session is required. Two methods are proposed, they rely on the statistical independence of the tag reading errors across different reader sessions, which is a plausible assumption when e.g. each reader…
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