Synchronization method for rfid system including tags having...

Details Synchronization method for rfid system including tags having... Synchronization method for rfid system including tags having...

H - Electricity

04

Q

H04Q 1/00 (2006.01) G06F 11/10 (2006.01) G06F 17/00 (2006.01) G06K 7/00 (2006.01) G06K 19/07 (2006.01) G07C 9/00 (2006.01) G08G 1/01 (2006.01) G08G 1/017 (2006.01)

Patent

CA 2322152

A synchronization method for an RFID system (10) including tags (40-1 to 40-n) having different memory sizes, employs a convention wherein sync words and sync bits are stored in tag memory (407) among data bits so that a reader (30) may readily identify the sync word on an RF signal (408) transmitted by a tag (40-1) and serially modulated by repetitions of the contents of the tag memory (407). After identifying the sync word, an RFID reader (30) reads data bits following the identified sync word until a next sync word is received, while ignoring the sync bits interspersed among the data bits.

L'invention concerne un procédé de synchronisation pour un système HFID (109 comprenant des étiquettes (40-1 à 40-n) présentant des capacités de mémoire différentes. Ce procédé utilise une convention en vertu de laquelle des mots synch et des bits synch sont mémorisés dans une mémoire étiquette (407) parmi des bits de données de manière qu'un lecteur (30) puisse facilement identifier le mot synch sur un signal HF (408) émis par une étiquette (40-1) et modulé en série par des répétitions du contenu de la mémoire étiquette (407). Après identification du mot synch, un lecteur HFID (30) lit les bits de données venant à la suite du mot synch identifié jusqu'à réception d'un mot synch suivant, tout en ignorant les bits synch mêlés aux bits de données.

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