Retwork: Exploring Reader Network with COTS RFID Systems
summary
Protocol identifies reader contention by piggybacking tag inventory flags to mimic a one-to-many write under EPC Gen2, then runs selective reads to mark overlaps. Prototype uses COTS readers and 8,000 commercial tags across up to 8 readers in a 12×8 m area, compatible with Magic/Impinj/Alien devices. Measured 14.7× speedup (55.9s → 3.9s for 5,000 tags), redundancy detection and network discovery run an order of magnitude faster, with <3.5% false positives and <0.3% false negatives.
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chapters (18)
- 0:00Intro
- 0:43What is RFID?
- 2:10Usage: Anti-Collision
- 3:07Naïve solution
- 3:55Basic idea
- 5:27Gen2 protocol
- 5:58Inventory flag
- 6:41Select command
- 7:54Query command
- 8:29Detection of contention link
- 9:41Gen2-Compatible Commands
- 11:47Identification of reader network
- 12:42Case study: redundancy detection
- 14:06Experimental setup
- 14:48Compatibility
- 15:15Retwork vs. Inventory
- 16:16Accuracy
- 16:59Reader Redundancy
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