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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

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Presentation on theme: "EPCglobal Class-1 Generation 2 UHF RFID Todd Humes, CTO Impinj, Inc. 501 N 34 th Street, Suite 100 Seattle, WA 98103"— Presentation transcript:

1 EPCglobal Class-1 Generation 2 UHF RFID Todd Humes, CTO Impinj, Inc. 501 N 34 th Street, Suite 100 Seattle, WA

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

3 3 RFID Hardware Overview Wafers Tags Reader

4 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 5 RFID Systems RFID Reader IP Network Tag Example data exchange: Forward Return Link parameters Tag inventory Link rates and encoding formats Singulation parameters, tag identification Network layerAir Interface RFID Reader

6 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 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 8 Air Interface Control Gen2 features PurposeS/W Control Tag selection and identification Singulation control and options for faster inventories Q-algorithm, Boolean selection, truncated replies Dense reader modeAllows for a large number of closely spaced readers with minimal interference and optimized data rate for high noise or high speed comm Forward link options – DSB- ASK, SSB-ASK, PR-ASK Return link options – Baseband or subcarrier backscatter SessionsMultiple readers talk within same tag population e.g. dock door reader + handheld Choice of four sessions Variable data ratesLink closure in varied environments Configure forward link (Tari, pulsewidth) and reverse link (preamble type, data rate, encoding - FMO or Miller) Kill and access password SecurityPassword validation and management


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