Section
7.3 explains the concept of RFID reader synchronization and how it adheres to strict
regulations. Section 7.4 suggests possible ways in implementing an RFID synchronization
system. A case study on RFID reader synchronization is presented in Section 7.5. Ways of
?¬?ne-tuning RFID reader positioning are discussed in Section 7.6. Variations of possible
reader synchronization schemes are presented in Section 7.7. Sections 7.8 and 7.9 offer views
FIGURE 7.1
A simple illustration of reader collision. Reply from tag
will be interfered by signal sent from another nearby
reader. (From Leong, K.S., Ng, M.L., and Cole, P.H.,
IEEE 2005 International Symposium on Microwave,
Antenna, Propagation and EMC Technologies for Wireless
Communications, Beijing, China, 2005, # 2005 by IEEE.
With permission.)
Reader A
Reader B
Tag
1
2
3
Antenna
Antenna
126 RFID Handbook: Applications, Technology, Security, and Privacy
on reader synchronization in the United States and the current progress of reader synchronization
standardization in Europe, respectively, followed by conclusions in Section 7.10.
7.2 RFID Regulations
7.2.1 ETSI 302 208
ETSI 302 208 is a European regulation governing the operation of RFID readers (ETSI,
2006). It allocates the frequency band of 865??“868 MHz for RFID deployment. This frequency
band is then divided into 15 sub-bands or channels, each spanning a total of 200 kHz.
Pages:
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254