An Empirical Study on Hidden Tag Problem

Abstract

Radio-frequency identification (RFID) techniques are widely used in many ubiquitous applications. The most important usage of RFID techniques is to read the tags within a reader's interrogation area such that the objects attached with those tags can be identified. In real practice, it is common that a tag is physically in the interrogation range but cannot be read by the reader, due to the multipath effect and other interference. This phenomenon, namely, the hidden tag problem, is a big challenge to achieve high identification rate. To address this problem, most prior works depend on empirical or measurement-based methods to tune the transmission power for readers. Such a case-by-case solution is impractical for generic implementation. In this paper, we theoretically and experimentally explore the reasons why hidden tag problem occurs. To alleviate its impact, we propose a unified and measurable model to formulate this problem and its impact. Different from previous works, our solution is generic and fully compatible with existing EPC C1G2 protocol. The analysis and measurement based on our model can help to design and deploy RFID systems with high identification rate.

Intelligent Electronic Management of Library by Radio Frequency Identification Technology

“…As shown in Figure 2, when the RFID technology is in operation, the reader is started, and an electromagnetic field is formed in a certain range around the reader after signal transmission through the reader's antenna (Rui et al 2015). When the identified object which carries electronic tag that contains the information of the object enters the electromagnetic field, an induced current is generated in the internal electronic tag due to electromagnetic induction, then sufficient energy is obtained to emit the information containing the identified object, i.e., the electronic tag is activated.…”

A Novel Multivariable Algorithm for Detecting and Tracing Metal Mobile Objects Employing a Simple RFID Setup

“…The object may abandon the cover area without identification, due to interference of static neighbor tags [4, 5]. The phenomenon, where other RFID tags are detected but the target is not, occurs also with static tags, and it is known as “the hidden tag problem” [6]. All these circumstances are relevant for industries that store, transport, and ship metal objects and require automating inventories.…”