Wi-Fi and 5G 177
can be recorded by the reader, which greatly simplifies the process of
payment for those items in a shop.
RFID transmission frequencies are determined by local or regional
standardization bodies. The main ones are indicated in the following
table:
Table 6.1. RFID transmission frequencies
6.19. EPCglobal
The purpose of RFIDs is to give the identity of the objects to which
they are attached. This identification system has been standardized by
the consortium EPCglobal. Two generations are available: EPC Gen1
and EPC Gen2. We shall focus particularly on this second generation,
released in mid-2006, which has become an industrial standard.
EPC Gen2 is the acronym for “EPCglobal UHF Class1 Generation
2”. Version 1.1 of this specification was released in May 2006. It
handles the protocol between the reader, on the one hand, and the
RFID and the identity, on the other. The object of the protocol is to
read, write and eliminate an RFID, so that readers sold by all
manufacturers are interchangeable.
The reading procedure is defined using a timeslot-based system
with an anti-collision system. Specifically, a reader can
www.it-ebooks.info