Browse Prior Art Database

A Robust Memory-Rich UHF Tag

IP.com Disclosure Number: IPCOM000189134D
Original Publication Date: 2009-Nov-11
Included in the Prior Art Database: 2009-Nov-11
Document File: 7 page(s) / 255K

Publishing Venue

Siemens

Related People

Juergen Carstens: CONTACT

Abstract

RFID (Radio Frequency Identification) tags are widely used in aerospace, defense, logistics, manufacturing, pharmacy and retail. Usually, the RFID tags are used as customized memory. For example, in car seat manufacturing seat specifications are stored on the tag which is later attached to a skeleton. After reading an item of seat specifications, each part is assembled sequentially on the production line. Furthermore, the outcome of the quality check is also written on the tag in order to detect defects in time. Furthermore, memory-rich tags are used more and more. Depending on the application, more or less user memory is needed. For example 512 bits are enough for applications with specific data storage requirements, including manufacturing lot and date code, expiration date and warranty information. However, these applications are not safe enough. Plain text is stored in the user memory of the tag which is not safe in regard to payment scenario. Encryption is one of the feasible solutions, but leads to huge amount of redundant bits. Thus costs increase if encryption is used to protect the data stored in the user memory.

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A Robust Memory-Rich UHF Tag

Idea: Dr. Yong Yuan, CN-Beijing; Dr. Xiadong Deng, CN-Shanghai; Dan Yu, CN-Beijing; Dieter
Horst, DE-Fuerth

RFID (Radio Frequency Identification) tags are widely used in aerospace, defense, logistics, manufacturing, pharmacy and retail. Usually, the RFID tags are used as customized memory. For example, in car seat manufacturing seat specifications are stored on the tag which is later attached to a skeleton. After reading an item of seat specifications, each part is assembled sequentially on the production line. Furthermore, the outcome of the quality check is also written on the tag in order to detect defects in time.

Furthermore, memory-rich tags are used more and more. Depending on the application, more or less user memory is needed. For example 512 bits are enough for applications with specific data storage requirements, including manufacturing lot and date code, expiration date and warranty information. However, these applications are not safe enough. Plain text is stored in the user memory of the tag which is not safe in regard to payment scenario. Encryption is one of the feasible solutions, but leads to huge amount of redundant bits. Thus costs increase if encryption is used to protect the data stored in the user memory.

Furthermore, the memory size of UHF passive tag can not be further extended (UHF: Ultra High Frequency). The passive tag uses a portion of incident energy which is rectified and smoothed in order to power the circuits. Usually, the power is barely enough to wake up a passive tag as well as enough to provide a sufficient transient current when writing large memory. Therefore, the memory-rich tag is not commercially available in short terms.

Up to now, a background database is used to store item-related data, since memory-rich tags are not commercially available in the short terms. The background database combines a unique identifier with a segment of memory space on a hard disk. Instead of reading from or writing to user memory of the tag, the reader generates an event which leads to retrieval or supplement of corresponding data to which the unique tag identifier points in the database. However, the unique identifier and the background database solution involves frequent operations on the database which leads to a heavy weight on the backbone network.

Therefore, a novel solution is proposed where a memory-rich UHF tag can be realized. This tag is called the Super Tag. The memory size of the Super Tag is supposed to be integer times of a normal UHF tag. In regard to compatibility with the current system, the Super Tag Protocol is defined as a custom protocol situated between application and the reader. Further, the Super Tag can recover data when a tag failure occurs. In addition, channel coding is used to guarantee data integrity in noisy environment

The Super...