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Touch Zones

RFID

  • Radio Frequency IDentification
  • Based on magnetic field induction
  • Plenty of standards
    • ISO IEC 105536, 14443, 15693
      • Many other ISO standards for different application areas
    • ETSI 308-220, 302
  • RFID system = RFID transmitter(tag) + RFID reader
    • Passive systems → tag has no power source
      • Power gained from incoming radio signal & magnetic field (faradays law)
    • Tags are either Read Only (RO) or Read & Write (RW)
    • Reader may have several antennas
      • May read several tags at the same time

Frequency

  • 3 frequency areas
    1. Low - 100 - 500 KHz (passive)
    2. Medium - 10 -15 MHz (passive)
      • Low & Medium frequeny systems require almost contact
    3. High (passive / active)
      • UHF: 433.5 - 434.5
      • ~850 - 950 MHz
      • Microwave : 2.4 GHz - 5.8 GHz
  • Several bands used in these areas
  • High frequency sytems have longer range

Data rates

  • Data rates vary
  • Electromagnetic fields cause problems

Application areas

  • User authentication (RFID based keys)
  • Product authentication
    • Electronic Product Code (EPC)
      • EAN barcode compliment/replacement
      • Product tracking
    • Logistics
    • Fabrication protection

Security

  • Unauthorised reading
  • Eavesdropping
  • Tag destroying
  • Tag fabrication
  • Privacy loss
  • Nokia Mobile RFID kit for Nokia 5140 & 5140i
  • Through express on RFID shells

Do it yourself - Auth with RFID

  • Required - RFID tag & RFID reader
  • Connect reader to PC's serial port
  • Move tag close to reader
    • Read tag data through serial connection
  • Store tag information to DB besides with user id
  • Create PAM module
    • Reads the serial line at login & compares it with data stored on DB
  • Create nice UI to add & remove users to / from system

NFC

  • Magnetic field induction to enable communication between two devices
  • 13.56 MHz unregulated RF band
  • Standardised by ECMA International
    • ECMA-340 NFC Interface & Protocol (NFCIP-1)
    • EMCA-352 NFCIP-2
    • Standards for interface & protocol tests also

Communication

  • Range is 0 - 20 cm
  • Employs half duplex
    • Listen before talk policy
  • Speeds of 106, 212 or 424 Kbps
  • P2P networking
    • Initiator initiates & controls the data exchange
    • Target is the responding device

Operation modes

  • 2 operation modes
    1. Active mode
      • Both devices generate own RF field for communication
    2. Passive mode
      • Only one device (Initiator) generates RF field
      • Target device uses load modulation to transfer data
      • Saves battery of battery operated target devices
  • Aim → simplify communications
    • Connection forming & data transfer requires
      • Start App & move devices close to each other
    • Compatible with FeliCa & MIFARE contactless smartcard protocol
    • FeliCa developed by Sony & MIFARE is a Philips spinoff
      • MIFARE: Over 1 Billion smartcard chips & 10 million reader modules sold
    • Nokia 3220, 6131 & 6212 have NFC shells - Mobile future?

NFC scenarios

  • Set up communication between 2 devices
    • Move devices close to each other
      • Devices transmit their Bluetooth data over NFC
    • Based on over NFC transmitted data connection is formed
  • Transfer content
    • Take picture with camera
    • Touch TV with camera to transfer picture to TV
  • Active advertisement
    • Touch tag on advertisement with mobile phone
  • Mobile phone connects to WAP page defined on the tag
    • Touch a tag of phone number & mobile phone calls that number
  • Electriciy man - Nokia Fied force solution demo
  • Payment system & mobile tickets

Considerations

  • How can we benefit from touch zone technologies
    • Does the use of touch zone actually add value to service?
    • Do we ease the use of the service or not?
  • Is the technology supported by the devices intended for use on our service?
  • Should we use plain RFID or NFC?
Last modified: 2013/07/01 14:42