Lecture 16: RFID and Bluetooth
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  • 1. RFID Review / Bluetooth ENGR 475 – Telecommunications Harding University December 5, 2006 Jonathan White
  • 2. Outline
    • What you need to know about RFID
    • Bluetooth
    • Applications
    • Future
    • Technical Specifications
      • Algorithms
      • Air Interface
      • Security Concerns
  • 3. RFID Review
    • RFID – Radio Frequency Identification.
    • Idea:
      • Use low cost tags to identify objects
    • Benefits:
      • Line of sight isn’t required (as in UPC Codes).
      • Much faster inventorying of objects.
      • Enables each item to be uniquely identified.
  • 4. RFID Review
    • 3 types of tags:
      • Active: Have a battery, are always able to transmit and receive, very large, long range, very expensive.
        • Example: Airplane controllers
      • Semi-Active: Have a battery, but they only transmit when in an RF field. They are large and fairly expensive.
        • Example: Toll tags
      • Passive: No battery, receive power from only the RF field, very small, very cheap, small range.
        • Example: Entry key fobs, Exxon SpeedPass, EPCGlobal tags.
  • 5. EPC
    • Electronic Product Code.
      • A replacement for UPC
      • Has all the data of a UPC plus other fields.
      • Some fields can be used to store variables.
      • Some fields can be used to uniquely identify each object.
      • Many interesting applications.
  • 6. EPC Details
    • Low Range: 20 feet
    • Low Cost: 5 cents
    • Low Power requirements:
      • Near field: Under 10 cm or so, tag acts like the opposite side of a transformer, and it can receive more power.
      • Far field: From .5 feet to 20 feet, tag uses backscattering to reflect a modulated RF field to the receiver.
    • Operates in the 900 MHz region.
      • Unlicensed, limited by the government.
  • 7. Bluetooth
    • Designed in Sweden in 1994.
    • The goal was to design one interface for devices to connect and exchange information wirelessly.
      • This would aid in the elimination of all the cables that are proliferating all around us.
      • Not designed to provide power, however.
      • Also, Bluetooth was originally designed to be short range and secure, but this is not necessarily true now.
  • 8. Bluetooth Applications
    • Wireless Cell phone handsets
    • Wireless controllers (Wii)
    • Wireless computer connections
      • Most common: keyboard, mouse, printer
    • For remote controls where IR was used.
      • Better range and accuracy.
        • PDA’s, Calculators
    • Transfer of files in an Ad Hoc Network.
      • If you don’t have a WiFi network available.
  • 9. Bluetooth Applications
  • 10. Future of Bluetooth
    • Bluetooth has a good future:
      • Data rates of 3 Mbps
      • Better security
      • Better range.
    • This will allow Bluetooth TVs and video projectors.
    • The goal is to make an unwired society.
      • But, you still need power.
  • 11. Technical Specs
    • Bluetooth operates in the 2.4 GHz range.
      • Unlicensed, same band that certain wireless phones, garage door openers, and baby monitors use.
    • Bluetooth devices typically operate at around .1 Watts.
      • Much less than the 3 Watts that a typical cell phone operates at.
    • Maximum range is supposed to 100 meters.
      • This can be extended to a mile with antennas.
  • 12. Technical Specs
    • Bluetooth can connect up to 8 devices.
      • 1 master, 7 slaves with about a 10 meter radius.
    • Bluetooth uses spread spectrum frequency hopping.
      • There are 79 potential frequencies a device can transmit on, so this should help eliminate collisions.
  • 13. Technical Specs
    • Devices constantly scan for a new Bluetooth connection.
      • This lets them know what master is controlling them, and whether or not another device should be added to the group.
    • Since this connection is automatic, security is a large problem for Bluetooth.
      • Bluetooth viruses, bluejacking, blue bugging.
  • 14. Conclusion
    • The use of Bluetooth will be expanded in the coming years.
    • Good for a wire replacement.
    • It won’t replace WiFi or cellular networks.
      • It’s impact on Telecommunications is very secondary.