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
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
Van Eeden HL. Passive UHF RFID systems. Ph. D. thesis. Northwest University, Potchefstroom. South Africa
Tag4
Tag5
Reader
Slow down instruction
Acknowledgement
Collision between
transmissions
No collision between
transmissions

4. Figure 9.3 Switch-off Supertag protocol sequence
Van Eeden HL. Passive UHF RFID systems. Ph. D. thesis. Northwest University, Potchefstroom. South Africa
Tag5
Reader
Switch off instructions
Collision between
transmissions
No collision between
transmissions

5. Table 9.1 Different implementations of the IP-X protocol
Protocol version
Baud rate
Maximum Interval V1
64k 4k V2
16k V3
256k V4 V5

6. Figure 9.4 iP-X R/W protocol flow diagram
Yes
Boot
Power-on reset
Wait random time
Transmit ID
Reader command?
Correct ID?
Wait command time
Execute command No
Van Eeden HL. Passive UHF RFID systems. Ph. D. thesis. Northwest University, Potchefstroom. South Africa

7. Figure 9.5 Average reading time distribution for the Supertag Free-running protocol
10 tags, 64k baud rate, 64k interval) generated using a protocol simulator, with 1,000 samples, resulting in average read time of ms, longest read time of ms and standard deviation of 70.2 ms
Van Eeden HL. Passive UHF RFID systems. Ph. D. thesis. Northwest University, Potchefstroom. South Africa

8. Figure 9.6 Average reading time distribution for the Supertag Switch-off protocol
10 tags, 64k baud rate, 64k interval) generated using a protocol simulator, with 1,000 samples, resulting in average read time of ms, longest read time of ms and standard deviation of 52.6 ms
Van Eeden HL. Passive UHF RFID systems. Ph. D. thesis. Northwest University, Potchefstroom. South Africa

9. Figure 9.7 Average reading time distribution for the Supertag Fast Switch-off protocol
10 tags, 64k baud rate, 64k interval) generated using a protocol simulator, with 1,000 samples, resulting in average read time of 72.6 ms, longest read time of ms and standard deviation of 8.1 ms
Van Eeden HL. Passive UHF RFID systems. Ph. D. thesis. Northwest University, Potchefstroom. South Africa

10. Figure 9.8 Protocol saturation in TTF protocols
Van Eeden HL. Passive UHF RFID systems. Ph. D. thesis. Northwest University, Potchefstroom. South Africa

11. Figure 9.9 Error rates for TTF protocols
Van Eeden HL. Passive UHF RFID systems. Ph. D. thesis. Northwest University, Potchefstroom. South Africa

12. Figure 9.10 Average reading times for different implementations of the iP-X protocol
Van Eeden HL. Passive UHF RFID systems. Ph. D. thesis. Northwest University, Potchefstroom. South Africa

13. Figure 9.11 Maximum reading rates for the iP-X protocols
Van Eeden HL. Passive UHF RFID systems. Ph. D. thesis. Northwest University, Potchefstroom. South Africa

14. Figure 9.12 Maximum tag speeds for the iP-X protocol
Van Eeden HL. Passive UHF RFID systems. Ph. D. thesis. Northwest University, Potchefstroom. South Africa

15. Figure 9.13 Average repeat rate of tag backscatter transmissions
Naudé CC, Marais HJ. Degradation in read performance with an increase in the number of user data pages. Internal research report. Faculty of Engineering. Northwest University, 2008.

16. Figure 9.14 Degradation of read performance
Naudé CC, Marais HJ. Degradation in read performance with an increase in the number of user data pages. Internal research report. Faculty of Engineering. Northwest University, 2008.

17. Figure 9.15 State diagram for the IP-X free-running TTF protocol
Van Eeden HL. Passive UHF RFID systems. Ph. D. thesis. Northwest University, Potchefstroom. South Africa

18. Figure 9.16 State diagram
EPC™ Radio Frequency Identity Protocols. Class-1 Generation-2 UHF RFID. Protocol for Communications at 860 – 960 MHz. Version January 2005.

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

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