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Chapter 9 - A Comparison of TTF and RTF UHF RFID Protocols

Chapter 9 - A Comparison of TTF and RTF UHF RFID Protocols. Figure 9.1 Tag transmissions operating under a free-running TTF protocol. Tag1. Tag2. Tag3. Reader. Collision between transmissions. No collision between transmissions.

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Chapter 9 - A Comparison of TTF and RTF UHF RFID Protocols

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  1. Chapter 9 - A Comparison of TTF and RTF UHF RFID Protocols

  2. Figure 9.1 Tag transmissions operating under a free-running TTF protocol Tag1 Tag2 Tag3 Reader Collision between transmissions No collision between transmissions

  3. Figure 9.2 Description of dynamic changing of the waiting period under the Supertag protocol Overcrowded tags Less congestion Tag1 Tag2 Tag3 Tag4 Tag5 Reader Slow down instruction Acknowledgement Collision between transmissions No collision between transmissions

  4. Figure 9.3 Switch-off Supertag protocol sequence Tag1 Tag2 Tag3 Tag4 Tag5 Reader Switch off instructions Collision between transmissions No collision between transmissions

  5. Table 9.1 Different implementations of the IP-X protocol

  6. Power-on reset Boot Wait random time Transmit ID No Reader command? Yes No Yes Correct ID? Wait command time Execute command Figure 9.4 iP-X R/W protocol flow diagram

  7. Figure 9.5 Average reading time distribution for the Supertag Free-running protocol

  8. Figure 9.6 Average reading time distribution for the Supertag Switch-off protocol

  9. Figure 9.7 Average reading time distribution for the Supertag Fast Switch-off protocol

  10. Figure 9.8 Protocol saturation in TTF protocols

  11. Figure 9.9 Error rates for TTF protocols

  12. Figure 9.10 Average reading times for different implementations of the iP-X protocol

  13. Figure 9.11 Maximum reading rates for the iP-X protocols

  14. Figure 9.12 Maximum tag speeds for the iP-X protocol

  15. Figure 9.13 Average repeat rate of tag backscatter transmissions

  16. Figure 9.14 Degradation of read performance

  17. Figure 9.15 State diagram for the IP-X free-running TTF protocol

  18. Figure 9.16 State diagram

  19. Figure 9.17 Spectrum of a Miller-encoded EPC reader

  20. Figure 9.18 Total number of EPC tag singulations for different link rates

  21. Figure 9.19 Number of tags detected from population of 4 using EPC Gen 2 with different link rates

  22. Figure 9.20 Comparison of EPC and IP-X in terms of total number of tag singulations

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