1 Kjell Åge Bringsrud ([email protected]) inf3190 Slide 1 Kjell Åge Bringsrud RFID (Radio Frequency IDentification) Short RFID History inf3190 Kjell Åge Bringsrud Slide 2 RFID • EPC Gen 2 architecture • EPC Gen 2 physical layer • EPC Gen 2 tag identification layer • Tag identification message formats inf3190 Slide 3 Kjell Åge Bringsrud R adio F requency ID entification Frequency Distance Example Application LF 125khz Few cm Auto- Immobilizer HF 13.56Mhz 1m Building Access UHF 900Mhz ~7m Supply Chain μwave 2.4Ghz 10m Traffic Toll Four main frequencies: Four main frequencies: • Tag wirelessly sends bits of data when Tag wirelessly sends bits of data when it is triggered by a reader it is triggered by a reader • Power source not required for Power source not required for passive tags… a defining benefit passive tags… a defining benefit • Superior capabilities to Superior capabilities to barcode: barcode: – Non Line of Sight Non Line of Sight – Hi Hi-speed, multiple reads speed, multiple reads – Can read Can read and and write to tags write to tags – Unit specific ID Unit specific ID Focus of this presentation is on UHF inf3190 4 Kjell Åge Bringsrud
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Short RFID History - heim.ifi.uio.noheim.ifi.uio.no/~inf3190/Forelesninger11/RFID-4x.pdf · Wildlife/Livestock monitoring and tracking inf3190 Kjell Åge Bringsrud 47 Smart groceries
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• EPC Gen 2 architecture• EPC Gen 2 physical layer• EPC Gen 2 tag identification layer• Tag identification message formats
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Radio Frequency IDentification
Frequency Distance Example Application
LF 125khz Few cm Auto-Immobilizer
HF 13.56Mhz 1m Building Access
UHF 900Mhz ~7m Supply Chain
μwave 2.4Ghz 10m Traffic Toll
Four main frequencies:Four main frequencies:
•• Tag wirelessly sends bits of data whenTag wirelessly sends bits of data whenit is triggered by a readerit is triggered by a reader
•• Power source not required for Power source not required for passive tags… a defining benefitpassive tags… a defining benefit
•• Superior capabilities to Superior capabilities to barcode:barcode:–– Non Line of SightNon Line of Sight–– HiHi--speed, multiple readsspeed, multiple reads–– Can read Can read andand write to tagswrite to tags–– Unit specific IDUnit specific ID
Focus of this presentation is on UHF
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What is RFID?What is RFID?
• RFID = Radio Frequency IDentification.
• An ADC (Automated Data Collection) technology that:uses radio-frequency waves to transfer data between a reader
and a movable item to identify, categorize, track..
Is fast and does not require physical sight or contact between reader/scanner and the tagged item.
Performs the operation using low cost components.Attempts to provide unique identification and backend
integration that allows for wide range of applications.
• Other ADC technologies: Bar codes, OCR.inf3190 Kjell Åge Bringsrud 6
RFID advantages over bar-codes
• No line of sight required for reading• Multiple items can be read with a single scan
• Each tag can carry a lot of data (read/write)• Individual items identified and not just the category
• Passive tags have a virtually unlimited lifetime• Active tags can be read from great distances
• Can be combined with barcode technology
What is a Radio-Frequency Identification (RFID) tag?
Chip (IC)
Antenna
• In terms of appearance…
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What is an RFID tag?
• You may own a few RFID tags…Proximity cards (contactless physical-access cards)ExxonMobil SpeedpassEZ Pass
• RFID in fact denotes a spectrum of devices:
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RFID devices take many forms
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• Characteristics:Passive device – receives power from readerRange of up to several metersIn effect a “smart label”: simply calls out its (unique) name
and/or static data
“74AB8”
“5F8KJ3”
“Plastic #3”
What is a basic RFID tag?
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•Tags can be attached to almost anything:Items, cases or pallets of products, high value goodsvehicles, assets, livestock or personnel
•Passive TagsDo not require power – Draws from Interrogator FieldLower storage capacities (few bits to 1 KB)Shorter read ranges (4 inches to 15 feet)Usually Write-Once-Read-Many/Read-Only tagsCost around 25 cents to few dollars
•Active Tags Battery poweredHigher storage capacities (512 KB)Longer read range (300 feet)Typically can be re-written by RF InterrogatorsCost around 50 to 250 dollars
RFID RFID tagstags
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RFID tag memory • Read-only tags
Tag ID is assigned at the factory during manufacturing
• Can never be changed• No additional data can be assigned to the tag
• Write once, read many (WORM) tagsData written once, e.g., during packing or manufacturing
• Tag is locked once data is written• Similar to a compact disc or DVD
• Read/Write Tag data can be changed over time
• Part or all of the data section can be locked
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RFID readers• Reader functions:
Remotely power tagsEstablish a bidirectional data linkInventory tags, filter resultsCommunicate with networked server(s)Can read 100-300 tags per second
• Readers (interrogators) can be at a fixed point such asEntrance/exitPoint of sale
• Readers can also be mobile/hand-held
UHF Reader Standards
GEO / CountryGEO / Country Frequency BandFrequency Band
North AmericaNorth America 900 900 –– 930 MHz930 MHz
ModulationModulation Typically ASK Typically ASK ––-- 20% to 100% 20% to 100% modulation depthmodulation depth
Note: EIRP = 1.64X ERP (Effective Radiated Power)
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Some RFID readers
Source: www.buyrfid.org
EPC Gen 2 Architecture
RFID architecture.
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RFID system components
Eth
erne
t
RFIDReader
RFID Tag RF Antenna Network Workstation
EPC Gen 2 Physical Layer
Reader and tag backscatter signals.
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RFID communicationRFID communication Host manages Reader(s) and issues Commands
Reader and tag communicate via RF signal Carrier signal generated by the reader Carrier signal sent out through the antennas Carrier signal hits tag(s) Tag receives and modifies carrier signal
– “sends back” modulated signal (Passive Backscatter – also referred to as “field disturbance device”)
Antennas receive the modulated signal and send them to the Reader
Reader decodes the data Results returned to the host application
EPC Gen 2 Tag Identification Layer
Example message exchange to identify a tag.inf3190 Slide 20Kjell Åge Bringsrud
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Electronic Product Code
Header - Tag version numberEPC Manager - Manufacturer IDObject class - Manufacturer’s product IDSerial Number - Unit ID
With 96 bit code, 268 million companies can each categorize 16 million different products where each product category contains up to 687 billion individual units
Note: 64 bit versions also defined, 256 bit version under definitioninf3190 Slide 21Kjell Åge Bringsrud
Tag Identification Message Formats
Format of the Query message.
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The Problems of Privacy and Security
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RFID means a world with billions of ant-sized, five-cent computers
• Highly mobile• Contain personal information• Subject to surreptitious scanning• Again, no cryptography…• Access control difficult to achieve• Data privacy difficult to achieve
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1500 Eurosin wallet
Serial numbers:597387,389473
…
Wigmodel #4456
(cheap polyester)
30 items of lingerie
Das Kapital andCommunist-party
handbook
Replacement hipmedical part #459382
The consumer privacy problemHere’sMr. Jonesin 2020…
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RFID Standards
• ISO/IEC JHC1/SC31/WG4" Automatic Identification and Data Capture
Techniques”• Electronic Product Code (EPCGlobal) - Industry
consortium• JTC 1/SC 17 Identification Cards and related devices• ISO TC 104 / SC 4 Identification and communication• ISO TC 23 / SC 19 Agricultural electronics• CEN TC 278 Road Transport and Traffic Telematicsinf3190 Kjell Åge Bringsrud Slide 26
RFID Standards (Cont)• CEN TC 23/SC 3/WG 3 Transportable Gas Cylinders -• Operational Requirements - Identification of cylinders and• contents• ISO TC204 Transport Information and Control Systems• American National Standards Institute (ANSI) X3T6: RF• Identification• European Telecommunications Standards Institute (ETSI)• ERO European Radio communications Office (ERO)• Universal Postal Union• ASTM International (Testing Materials)
• RetailInventory control and customer insightAuto checkout with reverse logistics
• SecurityAccess controlCounterfeiting and Theft control/prevention
• Location TrackingTraffic movement control and parking managementWildlife/Livestock monitoring and tracking
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Smart groceries
• Add an RFID tag to all items in the grocery.
• As the cart leaves the store, it passes through an RFID transceiver.
• The cart is rung up in seconds.
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1. Tagged item is removed from or placed in “Smart Cabinet”
3. Server/Database is updated to reflect item’s disposition
4. Designated individuals are notified regarding items that need attention (cabinet and shelf location, action required)
2. “Smart Cabinet” periodically interrogates to assess inventory
Passiveread/write tags affixed to caps of containers
Reader antennas placed under each shelf
Smart cabinet
Source: How Stuff Works
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Smart fridge
• Recognizes what’s been put in it• Recognizes when things are removed• Creates automatic shopping lists• Notifies you when things are past their expiration
• Shows you the recipes that most closely match what is available
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Smart groceries enhanced
• Track products through their entire lifetime.
Source: How Stuff Works
Temperature monitoring
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Pressure monitoring
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• Tire Monitoring• Refrigerator• Washing Machines• Dressing Rooms/Closets• Golf Balls• 10-15 years for most