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RCSMA: Receiver-based carrier sense multiple access in UHF RFID systems

  • Lei KANG*
  • , Jin ZHANG
  • , Kaishun WU
  • , Dian ZHANG
  • , Lionel NI
  • *Corresponding author for this work

Research output: Journal PublicationsJournal Article (refereed)peer-review

Abstract

RFID tag identification is a crucial problem in UHF RFID systems. Traditional tag identification algorithms can be classified into two categories, ALOHA-based and tree-based. Both of them are inefficient due to the incidental high coordination cost. In this paper, we bring CSMA into UHF RFID systems to enhance tag read rate by reducing coordination cost. However, it is not straightforward due to the simple hardware design of passive RFID tags, which is unable to sense the transmissions or collisions of other tags. To tackle this challenge, we propose receiver-based CSMA (RCSMA) in this paper. In RCSMA, the reader notifies the tags channel condition. According to different sensing results of reader's notifications, the tags take corresponding actions, e.g., random back off. RCSMA does not require special RFID tag hardware design. An absorbing Markov chain model is presented to analyze the performance of RCSMA and shown to be consistent with the simulation results. Compared with optimized ALOHA-based algorithms and optimized tree-based algorithms, RCSMA can enhance the tag read rate by 30-70 percent under different reader and tag data rates. © 2012 IEEE.
Original languageEnglish
Pages (from-to)735-743
Number of pages9
JournalIEEE Transactions on Parallel and Distributed Systems
Volume23
Issue number4
Early online date6 Oct 2011
DOIs
Publication statusPublished - Apr 2012
Externally publishedYes

Bibliographical note

Part of this work was conducted in Shanghai Key Lab of Scalable Computing and Systems at Shanghai Jiao Tong University, Shanghai, China.

Funding

This research was supported in part by Hong Kong RGC Grants HKUST617710 and HKUST617811, China NSFC Grants 60933011 and 60933012, and the Science and Technology Planning Project of Guangdong Province, China, under Grant No. 2009A080207002.

Keywords

  • CSMA
  • RFID systems
  • tag identification

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