An Approach To NFC's Mode Switch
Transcript of An Approach To NFC's Mode Switch
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An Approach To NFC‘s Mode Switch
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NFC-Research Project
Launch: Fall 2005
Member of NFC Forum for Standardization
Different Areas of Interests
− Hardware Development
− Use cases and Software/Application Development
− Usability
− Security
NFC Trials on University Campus
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NFC?
NFC = Near Field Communication
NFC is a wireless technology enabling data exchange within a range of up to 10 to 15 cm.
NFC Devices have three operation modes:
− P2P: Two devices exchange data bidirectionally with up to 424 kBit/sec.
− Reader/Writer: A NFC device reads and writes existing RFID cards/tags (Mifare, Felica, ISO14443)
− Card Emulation: A NFC device acts as contactless smartcard and is being recognized by existing RFID readers.
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P2P Mode
Hold two mobile phones together to exchange data.
Automatic setup of a WLAN link between an access point and a notebook.
Photos, Contacts
Configuration data (Keys etc.)
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Reader/Writer Mode
Smartposter: On an RFID tag additional information is stored (e.g. a URI). It can be read and processed by an NFC device (e.g. URI is opened in the appliance‘s browser). This spares entering or memorizing information.
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Card Emulation Mode
The NFC device emulates a contactless smart card and can be used for access and payment solutions. Sensitive information is stored in a secure element (Secure IC).
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NFC Hardware
Analog circuits: antenna, modem
NFC IC: PN512low-level protocol issues
Microcontroller: ATmega128runs firmware, host-communication
Secure Element: SmartMXJCOP/Mifare card, for secure transactions
Bluetooth: serial connection to host
Battery-powered
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Mode Switch (1)
Mode Switch
Capabil ity Disc overy Collision
Detection/r esolution
Device Selection
NFC FeliCa NFC Type A Type B
Capabil ity Disc overy Collision
Detection/r esolution
Device Selection
Capabil ity Disc overy Collision
Detection/r esolution
Device Selection
Use NFCIP-1 Data Exch ange Pr otocol
Communication Negotiation
Peer2Peer CommunicationNFCIP-1 Initiator
Reader/Writer CommunicationReader/Writer side
Use Tag Co mman ds
Use LLCP protoc ol Use NDEF-based applicatio ns
NFC Peer Mode NFC Reader/Writer Mode
One of the most basic components in the protocol stack
Responsible for:
Detection of otherdevices (Initiator)
Advertising of ownpresence (Target)
Device deactivation
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Mode Switch (2)
Requirements:
Low power consumption
Fast detection of peer devices
Reliable advertising of presence
Collision prevention
Support of all required smart-card standards:
ISO-14443A, ISO-14443B, Felica, Jewel, My-D, NFC-Forum Tags, etc…
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Mode Switch (3)
Suggested sequence of commands: Mode Switch requests cards to detect them
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Implementation
„Eternal“ cycle of request commands
Tag emulation persists at least for the delay time, longer if external field detected
ISO 14443-3A
Felica
NFC-devices will stay in mode when requested
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Possible issues
Incompatibility of modulation schemes
Mode selector sensitive to RF field breakdowns
Matching of NFCID1 and NFCID2
Interface to higher protocol levels not yet defined
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End
Questions?