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 language | English |
|---|---|
| Pages (from-to) | 735-743 |
| Number of pages | 9 |
| Journal | IEEE Transactions on Parallel and Distributed Systems |
| Volume | 23 |
| Issue number | 4 |
| Early online date | 6 Oct 2011 |
| DOIs | |
| Publication status | Published - Apr 2012 |
| Externally published | Yes |
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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