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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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Figure 9.1 Tag transmissions operating under a free-running TTF protocol Tag1 Tag2 Tag3 Reader Collision between transmissions No collision between transmissions
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
Figure 9.3 Switch-off Supertag protocol sequence Tag1 Tag2 Tag3 Tag4 Tag5 Reader Switch off instructions Collision between transmissions No collision between transmissions
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
Figure 9.5 Average reading time distribution for the Supertag Free-running protocol
Figure 9.6 Average reading time distribution for the Supertag Switch-off protocol
Figure 9.7 Average reading time distribution for the Supertag Fast Switch-off protocol
Figure 9.10 Average reading times for different implementations of the iP-X protocol
Figure 9.13 Average repeat rate of tag backscatter transmissions
Figure 9.15 State diagram for the IP-X free-running TTF protocol
Figure 9.18 Total number of EPC tag singulations for different link rates
Figure 9.19 Number of tags detected from population of 4 using EPC Gen 2 with different link rates
Figure 9.20 Comparison of EPC and IP-X in terms of total number of tag singulations
