Problems with RFID

Some common problems with RFID are
1> Reader collision :-
Reader collision occurs in RFID systems when the coverage area of one RFID reader overlaps with that of another reader.
2> Tag collision :-
Tag collision in RFID systems happens when multiple tags are energized by the RFID tag reader simultaneously, and reflect their respective signals back to the reader at the same time. This problem is often seen whenever a large volume of tags must be read together in the same RF field. The reader is unable to differentiate these signals;