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Wireless Service engineering

RFID

  • RFID Radio Frequency IDentification
  • Bases on magnetic field induction
  • Plenty of standards
    • ISO IEC 10536, 14443, 15693
      • several other ISO standards for different applicaion areas
    • ETSI 308-220, 302 208
  • RFID system consist of RFID transmitter (tag) and RFID reader
    • In passive systems the tag has no power source.
      • power is gained from incoming radio signal and magnetic field (faradays law)
    • Tags can be read only or have both read and write capability.
    • readers may have several antennas
      • May read several tags at same time
  • Three frequency areas
    • low: 100-500kHz (passive)
    • medium 10-15MHz (passive)
    • low and medium frequency system require almost contact
    • High: UHF: 433.5-434.5 and ~850-950MHz and microwave: 2.4GHz-5.8 GHz (passive or active)
    • Several bands used in these areas
    • High frequency systems have longer distance
  • Data rates vary.
  • Electromagnetic fields cause problems
  • Application areas
    • User authetication (RFID based keys)
    • Product authentication
      • EPC (Electronic Product code)
        • EAN code replacement
        • Product tracking
      • Logistics
      • Fabrication protection
  • Security risks:
    • Unauthorized reading
    • Eavesdropping
    • Destroying the tag
    • Tag fabrication
    • Loss of privacy
  • Nokia Mobile RFID Kit for Nokia 5140 and Nokia 5140i
    • Through express on rfid shells

Do it yourself: User authentication with RFID

  • Required: RFID tags and rfid reader
  • Connect the reader to the serial port of the computer.
  • Move tag close to reader and read the tag information through serial connection.
  • Store tag information to the database besides with user id.
  • Create a PAM module that reads the serial line during login and compares the read data to the data stored on database.
  • Create nice interfaces for adding and removing users to and from the system

NFC

  • Communication range is 0-20 centimeters.
  • Communication is half dublex
    • listen before talk policy
  • Communication speed 106, 212 or 424 kbps
  • Peer-to-peer networking
    • Initiator initiates and controls the data exchange
    • Target is the responding device
  • Two modes of operation
    • Active mode
      • both devices generate own RF field for communicating
    • Passive mode
      • Only one of the devices (Initiator) generates RF field
      • Target device uses load modulation to transfer data
      • Saves battery of battery operated target devices.
  • Targeted to simplify communications
    • Forming connection and transfering data requires just starting the application and moving the devices close to each other
  • Compatible with FeliCa nad Mifare contacless smartcard protocols
    • FeliCa is developed by Sony
    • Mifare is developed by Phillips
      • i250 million smart card chips and 1.5 million reader modules sold
  • Nokia 3220 has NFC shells available
    • More devices to come?

NFC Scenarios

  • Set up communication between two devices
    • Move devices close to each other
      • Devices transmit their Bluetooth communcation data to each other through NFC
    • Based on data transmitted through NFC Bluetooth connection is formed.
  • Transfer content
    • take picture with digital camera
    • Touch TV with camera to transfer picture to TV
  • Active advertisement
    • Touch a tag on advertisement with mobile phone
    • Mobile phone connects to wap page defined on the tag
    • touch a tag of phone number and mobile phone calls to that number
  • Electricity man, Nokia field force solution demo
  • Payment systems and mobile tickets.

Things to consider, touch area

  • How can our service benefit from touch zone technologies.
    • Does the use of touch zone actuall add value for service?
    • Do we ease the use of 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 14:41