Recognition system and recognition method for non-contact IC car

Details Recognition system and recognition method for non-contact IC car Recognition system and recognition method for non-contact IC car

1998-07-16

2000-03-21

Pitts, Harold I.

Communications: electrical

Traffic control indicator

Combined

235384, G08G 100

Patent

active

060407867

ABSTRACT:
A recognition system for non-contact IC cards that avoids the collision of response signals with a simple construction. A non-contact IC card in this system has a first transmitter that immediately transmits a response signal at a predetermined time slot for a first polling trial by the reader/writer and a second transmitter that transmits a response signal at a randomly time slot from a predetermined number of succeeding time slots, in response to a subsequent polling trial by the reader/writer. A reader/writer in this system has a polling unit that waits for the return of a response signal from a non-contact IC card at the predetermined time slot during the execution of a first polling trial and waits for the return of a response signal from a non-contact IC card at the randomly selected time slot during the execution of the subsequent polling trials.

REFERENCES:
patent: 5872525 (1999-02-01), Fukasawa et al.

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