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EPCglobal Class-1 Generation 2 UHF RFID

Todd Humes, CTO Impinj, Inc. 501 N 34 th Street, Suite 100 Seattle, WA 98103 todd.humes@impinj.com. EPCglobal Class-1 Generation 2 UHF RFID. An RFID Chip. More transistors than the processor in a 1985 IBM PC-AT Lower power consumption than a honeybee’s brain. RFID Hardware Overview. Wafers.

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EPCglobal Class-1 Generation 2 UHF RFID

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  1. Todd Humes, CTOImpinj, Inc.501 N 34th Street, Suite 100 Seattle, WA 98103todd.humes@impinj.com EPCglobal Class-1 Generation 2UHF RFID

  2. An RFID Chip More transistors than the processor in a 1985 IBM PC-AT Lower power consumption than a honeybee’s brain

  3. RFID Hardware Overview Wafers Tags Reader

  4. RFID is Old, what’s New • New standards at UHF (900 MHz) vs HF (13.56MHz) • UHF - 10X range of HF RFID • Faster data rates – up to 640kbps • But, presents many new challenges: • How to identify and read/write single tags from hundreds within a reader field... • Tag and reader RF interference... • Security.... • Tag data processing... • Solution - EPCglobal Gen2 standard

  5. Tag Tag Tag Tag RFID Systems Network layer Air Interface RFID Reader IP Network RFID Reader RFID Reader Example data exchange: Forward Return Link parameters Tag inventory Link rates and encoding formats Singulation parameters, tag identification

  6. Tag Identification • Suppose…you are all tags • You are all blindfolded • You are nearly deaf • You talk by whispering • You can’t hear each other • Suppose…I’m a reader • I’m blindfolded • I don’t know who is in the room • I need to yell so you can hear me • If two of you talk at once, I can’t understand you • I’m not allowed to say your name • I may hear many others like me screaming in the same room • I need to identify everybody in the room What do I do?

  7. Reader Environments • Operating Environment • A region within which a reader’s RF transmissions are attenuated by less than 90dB (roughly a sphere with a 1km radius) • Single-reader environment • A single reader operating in the environment • Multiple-reader environment • # of simultaneously active readers < # of available channels • Example: 10 readers operating in 50 channels • Dense-reader environment • # of simultaneously active readers  # of available channels • Example: 50 readers operating in 50 channels Readers require knowledge of operational deployment and the ability to adjust their RF parameters for a given environment -ie. One non-dense reader in a dense reader deployment will spoil the whole frequency plan

  8. Air Interface Control

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