TG34: RFID devices, a technical work group within ETSI has been ?¬?eld-testing late in 2006 in
an operational distribution center using a synchronized RFID system (O??™Connor, 2006). The
testing involved up to 36 adjacent portals operating simultaneously. Using identical pallets
comprising 63 ??????RFID unfriendly??™??™ cartons, a read rate of better than 98.5% is recorded. In the
near future, RFID reader synchronization would be included in ETSI TR 102 436 ??????Electromagnetic
compatibility and Radio spectrumMatters (ERM); Improved spectrumef?¬?ciency for
RFID in theUHF Band,??™??™ and be harmonized with the currentEN302 208. In addition, with the
standardization of RFID reader synchronization, the mandatory use of ??????Listen Before Talk,??™??™
which is a deterrent to large-scale deployment of RFID system, will be lifted, allowing a better
performance and better coverage RFID system in Europe.
7.10 Conclusion
This chapter has identi?¬?ed synchronization of RFID readers as a mechanism to assist in
RFID reader deployment in dense reader environments. Some implementation methods
and several ?¬?ne-tuning methods are presented in optimizing the performance of a
synchronized RFID system. As compared with conventional unsynchronized RFID systems,
a synchronized RFID system can offer more coverage, less reader collision or
interference, while strictly following the European regulations and the EPC C1G2
Integrated power
0 dBch
30 dBch
60 dBch
65 dBch
Frequency/Tari
6.
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