Lecture 16: RFID and Bluetooth


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Lecture 16: RFID and Bluetooth

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